flares/flares.py

"""
Filename: flares.py
Description: Core functionality for FLARES

Author: Tyler de Zeeuw
License: GPL-3.0
"""

# Built-in imports
import os
import sys
import platform
import threading
import logging
from io import BytesIO
from typing import Any, Optional, cast, Literal, Union
from itertools import compress
from copy import deepcopy
from multiprocessing import Queue
import os.path as op
import re
import traceback
from concurrent.futures import ProcessPoolExecutor, as_completed

# External library imports
import matplotlib.pyplot as plt
import matplotlib.colors as mcolors
from matplotlib.figure import Figure
from matplotlib.axes import Axes
from matplotlib.colors import LinearSegmentedColormap

import numpy as np
from numpy.typing import NDArray
from numpy import float64

import pandas as pd
from pandas import DataFrame

import seaborn as sns
import h5py

from nilearn.plotting import plot_design_matrix  # type: ignore
from nilearn.glm.regression import OLSModel

import statsmodels.formula.api as smf  # type: ignore
from statsmodels.stats.multitest import multipletests

from scipy import stats
from scipy.spatial.distance import cdist

# Backen visualization needed to be defined for pyinstaller
import pyvistaqt # type: ignore
# import vtkmodules.util.data_model
# import vtkmodules.util.execution_model

# External library imports for mne
from mne import (
    EvokedArray, SourceEstimate, Info, Epochs, Label, Annotations,
    events_from_annotations, read_source_spaces,
    stc_near_sensors, pick_types, grand_average, get_config, set_config, read_labels_from_annot
)  # type: ignore
from mne.source_space import SourceSpaces
from mne.transforms import Transform  # type: ignore
from mne.io import BaseRaw, read_raw_snirf  # type: ignore
from mne.preprocessing.nirs import (
    beer_lambert_law, optical_density,
    temporal_derivative_distribution_repair,
    source_detector_distances, short_channels
)  # type: ignore
from mne.viz import Brain, plot_events, plot_evoked_topo, plot_compare_evokeds
from mne.filter import filter_data  # type: ignore
from mne.utils import _check_fname, _validate_type, warn
from mne.channels import make_standard_montage
from mne.datasets.sample import data_path

from mne_nirs.visualisation import plot_glm_group_topo  # type: ignore
from mne_nirs.channels import get_long_channels, get_short_channels  # type: ignore
from mne_nirs.experimental_design import make_first_level_design_matrix  # type: ignore
from mne_nirs.statistics import run_glm, statsmodels_to_results  # type: ignore
from mne_nirs.signal_enhancement import (
    enhance_negative_correlation, short_channel_regression
)  # type: ignore
from mne_nirs.io.fold import fold_channel_specificity  # type: ignore
from mne_nirs.preprocessing import peak_power  # type: ignore
from mne_nirs.statistics._glm_level_first import RegressionResults  # type: ignore


os.environ["SUBJECTS_DIR"] = str(data_path()) + "/subjects" # type: ignore

FIXED_CATEGORY_COLORS = {
    "SCI only": "skyblue",
    "PSP only": "salmon",
    "SNR only": "lightgreen",
    "PSP + SCI": "orange",
    "SCI + SNR": "violet",
    "PSP + SNR": "gold",
    "SCI + PSP": "orange",
    "SNR + SCI": "violet",
    "SNR + PSP": "gold",
    "PSP + SNR + SCI": "gray",
    "SCI + PSP + SNR": "gray",
    "SCI + SNR + PSP": "gray",
    "PSP + SCI + SNR": "gray",
    "PSP + SNR + SCI": "gray",
    "SNR + SCI + PSP": "gray",
    "SNR + PSP + SCI": "gray",
}


AGE: float
GENDER: str

SECONDS_TO_STRIP: int
DOWNSAMPLE: bool
DOWNSAMPLE_FREQUENCY: int

SCI: bool
SCI_TIME_WINDOW: int
SCI_THRESHOLD: float

SNR: bool
# SNR_TIME_WINDOW : int
SNR_THRESHOLD: float

PSP: bool
PSP_TIME_WINDOW: int
PSP_THRESHOLD: float

TDDR: bool

ENHANCE_NEGATIVE_CORRELATION: bool

SHORT_CHANNEL: bool

REMOVE_EVENTS: list

TIME_WINDOW_START: int
TIME_WINDOW_END: int

VERBOSITY = True

# FIXME: Shouldn't need each ordering - just order it before checking
FIXED_CATEGORY_COLORS = {
    "SCI only": "skyblue",
    "PSP only": "salmon",
    "SNR only": "lightgreen",
    "PSP + SCI": "orange",
    "SCI + SNR": "violet",
    "PSP + SNR": "gold",
    "SCI + PSP": "orange",
    "SNR + SCI": "violet",
    "SNR + PSP": "gold",
    "PSP + SNR + SCI": "gray",
    "SCI + PSP + SNR": "gray",
    "SCI + SNR + PSP": "gray",
    "PSP + SCI + SNR": "gray",
    "PSP + SNR + SCI": "gray",
    "SNR + SCI + PSP": "gray",
    "SNR + PSP + SCI": "gray",
}


AGE = 25
GENDER = ""
GROUP = "Default"

REQUIRED_KEYS: dict[str, Any] = {
        

    "SECONDS_TO_STRIP": int,
    "DOWNSAMPLE": bool,
    "DOWNSAMPLE_FREQUENCY": int,

    "SCI": bool,
    "SCI_TIME_WINDOW": int,
    "SCI_THRESHOLD": float,

    "SNR": bool,
    # SNR_TIME_WINDOW : int
    "SNR_THRESHOLD": float,

    "PSP": bool,
    "PSP_TIME_WINDOW": int,
    "PSP_THRESHOLD": float,
    
    "SHORT_CHANNEL": bool,
    "REMOVE_EVENTS": list,
    "TIME_WINDOW_START": int,
    "TIME_WINDOW_END": int
    # "REJECT_PAIRS": bool,
    # "FORCE_DROP_ANNOTATIONS": list,
    # "FILTER_LOW_PASS": float,
    # "FILTER_HIGH_PASS": float,
    # "EPOCH_PAIR_TOLERANCE_WINDOW": int,
}


class ProcessingError(Exception):
    def __init__(self, message: str = "Something went wrong!"):
        self.message = message
        super().__init__(self.message)


# Ensure that we are working in the directory of this file
script_dir = os.path.dirname(os.path.abspath(__file__))
os.chdir(script_dir)

PLATFORM_NAME = platform.system().lower()

# Configure logging to file with timestamps and realtime flush
if PLATFORM_NAME == 'darwin':
    logging.basicConfig(
        filename=os.path.join(os.path.dirname(sys.executable), "../../../fnirs_analysis.log"),
        level=logging.INFO,
        format='%(asctime)s - %(processName)s - %(levelname)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S',
        filemode='a'
    )

else:
    logging.basicConfig(
        filename='fnirs_analysis.log',
        level=logging.INFO,
        format='%(asctime)s - %(processName)s - %(levelname)s - %(message)s',
        datefmt='%Y-%m-%d %H:%M:%S',
        filemode='a'
    )

logger = logging.getLogger()




def set_config_me(config: dict[str, Any]) -> None:
    """
    Validates and applies the given configuration dictionary.

    Parameters
    ----------
    config : dict[str, Any]
        Dictionary containing configuration keys and their values.
    """
    logger.info(f"[DEBUG] set_config called")

    globals().update(config)

    
def set_metadata(file_path, metadata: dict[str, Any]) -> None:
    """
    Validates and applies the given configuration dictionary.

    Parameters
    ----------
    config : dict[str, Any]
        Dictionary containing configuration keys and their values.
    """
    logger.info(f"[DEBUG] set_metadata called")

    globals()['AGE'] = 25
    globals()['GENDER'] = ""
    globals()['GROUP'] = "Default"
    
    if metadata.get(file_path) is not None:
                
        file_metadata = metadata.get(file_path, {})

        for key in ("AGE", "GENDER", "GROUP"):
            val = file_metadata.get(key, None)
            if val not in (None, '', [], {}, ()):  # check for "empty" values
                globals()[key] = val
from queue import Empty  # This works with multiprocessing.Manager().Queue()


def gui_entry(config: dict[str, Any], gui_queue: Queue, progress_queue: Queue) -> None:
    def forward_progress():
        while True:
            try:
                msg = progress_queue.get(timeout=1)
                if msg == "__done__":
                    break
                gui_queue.put(msg)
            except Empty:
                continue
            except Exception as e:
                gui_queue.put({
                    "type": "error",
                    "error": f"Forwarding thread crashed: {e}",
                    "traceback": traceback.format_exc()
                })
                break

    t = threading.Thread(target=forward_progress, daemon=True)
    t.start()

    try:
        file_paths = config['SNIRF_FILES']
        file_params = config['PARAMS']
        file_metadata = config['METADATA']
        max_workers = file_params.get("MAX_WORKERS", int(os.cpu_count()/4))

        results = process_multiple_participants(
            file_paths, file_params, file_metadata, progress_queue, max_workers
        )

        gui_queue.put({"success": True, "result": results})

    except Exception as e:
        gui_queue.put({
            "success": False,
            "error": str(e),
            "traceback": traceback.format_exc()
        })

    finally:
        # Always send done to the thread and avoid hanging
        try:
            progress_queue.put("__done__")
        except:
            pass
        t.join(timeout=5)  # prevent permanent hang



def process_participant_worker(args):
    file_path, file_params, file_metadata, progress_queue = args

    set_config_me(file_params)
    set_metadata(file_path, file_metadata)
    logger.info(f"DEBUG: Metadata for {file_path}: AGE={globals().get('AGE')}, GENDER={globals().get('GENDER')}, GROUP={globals().get('GROUP')}")

    def progress_callback(step_idx):
        if progress_queue:
            progress_queue.put(('progress', file_path, step_idx))

    try:
        result = process_participant(file_path, progress_callback=progress_callback)
        return file_path, result, None
    except Exception as e:
        error_trace = traceback.format_exc()
        return file_path, None, (str(e), error_trace)


def process_multiple_participants(file_paths, file_params, file_metadata, progress_queue=None, max_workers=None):
    results_by_file = {}

    file_args = [(file_path, file_params, file_metadata, progress_queue) for file_path in file_paths]

    with ProcessPoolExecutor(max_workers=max_workers) as executor:
        futures = {executor.submit(process_participant_worker, arg): arg[0] for arg in file_args}

        for future in as_completed(futures):
            file_path = futures[future]
            try:
                file_path, result, error = future.result()
                if error:
                    error_message, error_traceback = error
                    if progress_queue:
                        progress_queue.put({
                            "type": "error",
                            "file": file_path,
                            "error": error_message,
                            "traceback": error_traceback
                        })
                    continue
                
                results_by_file[file_path] = result
            except Exception as e:
                print(f"Unexpected error processing {file_path}: {e}")

    return results_by_file




def markbad(data, ax, ch_names: list[str]) -> None:
    """
    Add a strikethrough to a plot for channels marked as bad.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    ax : Axes
        Matplotlib Axes object where the strikethrough lines will be drawn.
    ch_names : list[str]
        List of channel names corresponding to the y-axis of the plot.
    """

    # Iterate over all the channels
    for i, ch in enumerate(ch_names):

        # If it is marked as bad, place a strikethrough on the channel
        if ch in data.info["bads"]:
            ax.axhline(i + 0.5, ls="solid", lw=4, color="black", zorder=10) # type: ignore



def plot_timechannel_quality_metrics(data, scores, times: list[tuple[float]], color_stops: tuple[list[float], list[float]], threshold: float, title: Optional[str] = None):

    """
    Generate two heatmaps visualizing channel quality metrics over time.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    scores : NDArray[float64]
        A 2D array of quality scores for each channel over time.
    times : list[tuple[float]]
        List of time boundaries used to label each score column.
    color_stops : tuple[list[float], list[float]]
        Two lists of color values for custom colormaps.
    threshold : float, 
        Threshold value for the color bar.
    title : Optional[str], optional
        Base title for the figures, (default is None).

    Returns
    -------
    tuple[Figure, Figure]
        - Figure: Heatmap of all scores across channels and time.
        - Figure: Binary heatmap showing only scores above the threshold.
    """

    # Get only the hbo / hbr channels once as we dont need to see the same results twice
    half_ch = len(getattr(data, "ch_names")) // 2
    ch_names = getattr(data, "ch_names")[:half_ch]
    scores = scores[:half_ch, :]
    
    # Extract rounded time points to use as column headers
    cols = [np.round(t[0]) for t in times]
    n_chans = len(ch_names)
    vsize = 0.2 * n_chans

    # Create the first figure
    fig1, ax1 = plt.subplots(figsize=(10, vsize), layout="constrained")  # type: ignore
    fig1.suptitle(title + " - All Scores", fontsize=16, fontweight="bold")  # type: ignore

    # Create a DataFrame to structure data for the heatmap
    data_to_plot = DataFrame(
        data=scores,
        columns=pd.Index(cols, name="Time (s)"),
        index=pd.Index(ch_names, name="Channel"),
    )

    # Define a custom colormap using provided color stops and base colors
    base_colors = ['red', 'red', 'yellow', 'green', 'green']
    colors = list(zip(color_stops[0], base_colors[:len(color_stops[0])]))
    cmap = mcolors.LinearSegmentedColormap.from_list('gyr', colors)

    # Plot heatmap of scores
    sns.heatmap(  # type: ignore
        data=data_to_plot,
        cmap=cmap,
        vmin=0,
        vmax=1,
        cbar_kws=dict(label="Score"),
        ax=ax1,
    )

    # Add vertical dashed lines at each time boundary, sit the title, and place a black strikethrough through a bad channel
    for x in range(1, len(times)):
        ax1.axvline(x, ls="dashed", lw=0.25, dashes=(25, 15), color="gray") # type: ignore
    ax1.set_title("All Scores", fontweight="bold") # type: ignore
    markbad(data, ax1, ch_names)

    # Calculate average score per channel and annotate to the right of the heatmap
    avg_sci_subset: pd.Series[float] = data_to_plot.mean(axis=1) # type: ignore
    norm = mcolors.Normalize(vmin=0, vmax=1)
    text_x = data_to_plot.shape[1] + 0.5
    for i, val in enumerate(avg_sci_subset):
        color = cmap(norm(val))
        ax1.text( # type: ignore
            text_x,
            i + 0.5,
            f"{val:.3f}",
            va='center',
            ha='left',
            fontsize=9,
            color=color
        )
    ax1.set_xlim(right=text_x + 1.5)
    
    plt.close(fig1)

    # Create the second figure
    fig2, ax2 = plt.subplots(figsize=(10, vsize), layout="constrained") # type: ignore
    fig2.suptitle(title + " - Scores Above Threshold", fontsize=16, fontweight="bold") # type: ignore
   
    # Create a DataFrame to structure data for the heatmap
    data_to_plot = DataFrame(
        data=scores > threshold,
        columns=pd.Index(cols, name="Time (s)"),
        index=pd.Index(ch_names, name="Channel"),
    )

    # Define a custom colormap using provided color stops and base colors
    base_colors = ['red', 'red', 'white', 'white']
    colors = list(zip(color_stops[1], base_colors[:len(color_stops[1])]))
    cmap = mcolors.LinearSegmentedColormap.from_list('gyr', colors)

    # Plot heatmap of scores
    sns.heatmap( # type: ignore
        data=data_to_plot,
        vmin=0,
        vmax=1,
        cmap=cmap,
        cbar_kws=dict(label="Score"),
        ax=ax2,
    )

    # Add vertical dashed lines at each time boundary, sit the title, and place a black strikethrough through a bad channel
    for x in range(1, len(times)):
        ax2.axvline(x, ls="dashed", lw=0.25, dashes=(25, 15), color="gray") # type: ignore
    ax2.set_title("Scores > Threshold", fontweight="bold") # type: ignore
    markbad(data, ax2, ch_names)
    
    plt.close(fig2)

    return fig1, fig2


def scalp_coupling_index_windowed_raw(data, time_window: float = 3.0, l_freq: float = 0.7, h_freq: float = 1.5, l_trans_bandwidth: float = 0.3, h_trans_bandwidth: float = 0.3):
    """
    Compute windowed scalp coupling index (SCI) across fNIRS channels.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    time_window : float, optional
        Length of each time window in seconds (default is 3.0).
    l_freq : float, optional
        Low cutoff frequency for filtering in Hz (default is 0.7).
    h_freq : float, optional
        High cutoff frequency for filtering in Hz (default is 1.5).
    l_trans_bandwidth : float, optional
        Transition bandwidth for the low cutoff in Hz (default is 0.3).
    h_trans_bandwidth : float, optional
        Transition bandwidth for the high cutoff in Hz (default is 0.3).

    Returns
    -------
    tuple[BaseRaw, NDArray[float64], list[tuple[float, float]]]
        - BaseRaw: The original data object (unchanged). Ensures compatibility with peak_power().
        - NDArray[float64]: Correlation scores for each channel and time window.
        - list[tuple[float, float]]: Time intervals for each window in seconds.
    """

    # Pick only fNIRS channels and sort them by channel name
    picks: NDArray[np.intp] = pick_types(cast(Info, data.info), fnirs=True) # type: ignore
    picks = picks[np.argsort([getattr(data, "ch_names")[pick] for pick in picks])]

    # FIXME: This may happen if the heart rate calculation tries to set a value way too low
    if l_freq < 0.3:
        l_freq = 0.3

    # Band-pass filter the selected fNIRS channels
    filtered_data = filter_data(
        getattr(data, "_data"), 
        getattr(data, "info")["sfreq"],
        l_freq,
        h_freq,
        picks=picks,
        verbose=False,
        l_trans_bandwidth=l_trans_bandwidth, # type: ignore
        h_trans_bandwidth=h_trans_bandwidth, # type: ignore
    )

    # Calculate number of samples per time window, the total number of windows, and prepare output variables
    window_samples = int(np.ceil(time_window * getattr(data, "info")["sfreq"]))
    n_windows = int(np.floor(len(data) / window_samples))
    scores = np.zeros((len(picks), n_windows))
    times: list[tuple[float, float]] = []

    # Slide through the data in windows to compute scalp coupling index (SCI)
    for window in range(n_windows):
        start_sample = int(window * window_samples)
        end_sample = start_sample + window_samples
        end_sample = np.min([end_sample, len(data) - 1])

        # Track time boundaries for each window
        t_start = getattr(data, "times")[start_sample]
        t_stop = getattr(data, "times")[end_sample]
        times.append((t_start, t_stop))

        # Iterate through channels in pairs (hbo, hbr). This requires them to be sorted by channel name
        for ii in range(0, len(picks), 2):
            c1 = filtered_data[picks[ii]][start_sample:end_sample]
            c2 = filtered_data[picks[ii + 1]][start_sample:end_sample]

            # Ensure the correlation data is valid
            if np.std(c1) == 0 or np.std(c2) == 0 or np.any(np.isnan(c1)) or np.any(np.isnan(c2)):
                c = 0
            else:
                c = np.corrcoef(c1, c2)[0][1]

            # Assign the computed correlation to both channels in the pair
            scores[ii, window] = c
            scores[ii + 1, window] = c

    scores = scores[np.argsort(picks)]

    return data, scores, times

def calculate_scalp_coupling(data, l_freq: float = 0.7, h_freq: float = 1.5):
    """
    Calculate the scalp coupling index (SCI) and identify bad channels based on a threshold.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    l_freq : float, optional
        Low cutoff frequency for bandpass filtering in Hz (default is 0.7).
    h_freq : float, optional
        High cutoff frequency for bandpass filtering in Hz (default is 1.5)

    Returns
    -------
    tuple[list[str], Figure, Figure]
        - list[str]: Channel names identified as bad based on SCI threshold.
        - Figure: Heatmap of all SCI scores across time and channels.
        - Figure: Binary heatmap of SCI scores exceeding the threshold.
    """

    print("Calculating scalp coupling index...")

    # Compute the SCI
    _, scores, times = scalp_coupling_index_windowed_raw(data, time_window=SCI_TIME_WINDOW, l_freq=l_freq, h_freq=h_freq)

    # Identify channels that don't meet the provided threshold
    print("Identifying channels that do not meet the threshold...")
    sci = scores.mean(axis=1)
    data.info["bads"] = list(compress(cast(list[str], getattr(data, "ch_names")), sci < SCI_THRESHOLD))

    # Determine the colors based on the threshold, and create the figures
    print("Creating the figures...")
    color_stops = ([0.0, SCI_THRESHOLD, SCI_THRESHOLD+0.1, 0.8, 1.0], [0.0, SCI_THRESHOLD, SCI_THRESHOLD, 1.0])
    fig1, fig2 = plot_timechannel_quality_metrics(data, scores, times, color_stops, SCI_THRESHOLD, "Scalp Coupling Index")

    print("Successfully calculated scalp coupling index.")

    return list(compress(cast(list[str], getattr(data, "ch_names")), sci < SCI_THRESHOLD)), fig1, fig2



def calculate_signal_noise_ratio(data):
    """
    Calculates the signal-to-noise ratio (SNR) for each channel and identifies those below a defined threshold.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.

    Returns
    -------
    tuple[list[str], Figure]
        - list[str]: A list of channel names that fall below the SNR threshold and are considered bad.
        - Figure: A matplotlib Figure showing the channels' SNR values.
    """
    
    print("Calculating signal to noise ratio...")

    # Compute the signal-to-noise ratio values
    print("Computing the signal to noise power...")
    signal_band=(0.01, 0.5)
    noise_band=(1.0, 10.0)
    data_signal = data.copy().filter(*signal_band, verbose=False) #type: ignore
    data_noise = data.copy().filter(*noise_band, verbose=False) #type: ignore
    signal_power = np.mean(data_signal.get_data()**2, axis=1) #type: ignore
    noise_power = np.mean(data_noise.get_data()**2, axis=1) #type: ignore

    # Calculate the snr using the standard formula for dB
    snr = 10 * np.log10(signal_power / (noise_power + np.finfo(float).eps))

    # TODO: Understand what this does
    groups: dict[str, list[str]] = {}
    for ch in getattr(data, "ch_names"):
        # Look for the space in the channel names and remove the characters after
        # This is so we can get both oxy and deoxy to remove, as they will have the same source and detector
        base = ch.rsplit(' ', 1)[0]
        groups.setdefault(base, []).append(ch) # type: ignore

    # If any of the channels do not meet our threshold, they will get inserted into the bad_channels set
    bad_channels: set[str] = set()
    for base, ch_list in groups.items():
        if any(s < SNR_THRESHOLD for s, ch in zip(snr, getattr(data, "ch_names")) if ch in ch_list):
            bad_channels.update(ch_list)

    # Design and create the figure
    print("Creating the figure...")
    snr_fig, ax = plt.subplots(figsize=(12, 4), layout="constrained") # type: ignore
    colors = [(0/20, 'red'), (SNR_THRESHOLD/20, 'red'), ((SNR_THRESHOLD+.5)/20, 'yellow'), ((SNR_THRESHOLD+1)/20, 'green'), (20/20, 'green')]
    cmap = LinearSegmentedColormap.from_list('custom_snr_cmap', colors)
    norm = mcolors.Normalize(vmin=0, vmax=20)
    scatter = ax.scatter(range(len(snr)), snr, c=snr, cmap=cmap, alpha=0.8, s=100, norm=norm) # type: ignore
    ax.set(xlabel="Channel Number",  ylabel="Signal-to-Noise Ratio (dB)", xlim=[0, len(snr)], ylim=[0, 20])
    ax.axhline(SNR_THRESHOLD, color='black', linestyle='--', alpha=0.3, linewidth=1) # type: ignore
    cbar = snr_fig.colorbar(scatter, ax=ax, label="SNR Thresholds (dB)") # type: ignore
    cbar.set_ticks([0, SNR_THRESHOLD, SNR_THRESHOLD+1, 20]) # type: ignore
    cbar.set_ticklabels(['0', str(SNR_THRESHOLD), str(SNR_THRESHOLD+1), '20']) # type: ignore

    plt.close()

    print("Successfully calculated signal to noise ratio.")

    return list(bad_channels), snr_fig



def build_fnirs_adjacency(raw, threshold_meters=0.03):
    """Build an adjacency dictionary for fNIRS channels using 3D distance."""
    # Extract channel positions
    ch_locs = []
    ch_names = []
    
    for ch in raw.info['chs']:
        loc = ch['loc'][:3]  # Get x, y, z coordinates
        if not np.isnan(loc).any():
            ch_locs.append(loc)
            ch_names.append(ch['ch_name'])
    
    ch_locs = np.array(ch_locs)
    
    # Compute pairwise distances
    dists = cdist(ch_locs, ch_locs)
    
    # Build adjacency dictionary
    adjacency = {}
    for i, ch_name in enumerate(ch_names):
        neighbors = [ch_names[j] for j in range(len(ch_names))
                     if 0 < dists[i, j] < threshold_meters]
        adjacency[ch_name] = neighbors
    
    return adjacency



def get_hbo_hbr_picks(raw):
    # Pick all fNIRS channels
    fnirs_picks = pick_types(raw.info, fnirs=True, exclude=[])

    # Extract wavelengths from channel names (expecting something like 'S6_D4 763' or 'S6_D4 841')
    wavelengths = []
    for idx in fnirs_picks:
        ch_name = raw.ch_names[idx]
        # Extract last 3 digits from channel name using regex
        match = re.search(r'(\d{3})$', ch_name)
        if match:
            wavelengths.append(int(match.group(1)))
        else:
            raise ValueError(f"Channel name '{ch_name}' does not end with 3 digits.")

    wavelengths = np.array(wavelengths)
    unique_wavelengths = np.unique(wavelengths)
    if len(unique_wavelengths) != 2:
        raise RuntimeError(f"Expected exactly 2 distinct wavelengths, found {unique_wavelengths}")

    # Determine which is HbO (larger) and which is HbR (smaller)
    hbr_wl = unique_wavelengths.min()
    hbo_wl = unique_wavelengths.max()

    print(f"HbR wavelength: {hbr_wl}, HbO wavelength: {hbo_wl}")

    # Find picks corresponding to each wavelength
    hbr_picks = [fnirs_picks[i] for i, wl in enumerate(wavelengths) if wl == hbr_wl]
    hbo_picks = [fnirs_picks[i] for i, wl in enumerate(wavelengths) if wl == hbo_wl]

    print(f"Found {len(hbr_picks)} HbR channels and {len(hbo_picks)} HbO channels.")

    return hbo_picks, hbr_picks, hbo_wl, hbr_wl


def interpolate_fNIRS_bads_weighted_average(raw, bad_channels, max_dist=0.03, min_neighbors=2):
    """
    Interpolate bad fNIRS channels using a distance-weighted average of nearby good channels.

    Parameters
    ----------
    raw : mne.io.Raw
        The raw fNIRS data with bads marked in raw.info['bads'].
    max_dist : float
        Maximum distance (in meters) to consider for neighboring good channels.
    min_neighbors : int
        Minimum number of neighbors required to interpolate a bad channel.

    Returns
    -------
    raw : mne.io.Raw
        Modified raw object with bads interpolated (in-place).
    """

    print("Finding fNIRS channels...")
    hbo_picks, hbr_picks, hbo_wl, hbr_wl = get_hbo_hbr_picks(raw)


    if len(hbo_picks) != len(hbr_picks):
        raise RuntimeError("Number of HbO and HbR channels must be the same.")

    # Base names without wavelength for pairing
    def base_name(ch_name):
        # Strip last 4 chars assuming format ' <wavelength>'
        # e.g. "S6_D6 841" -> "S6_D6"
        return ch_name[:-4]

    hbo_names = [base_name(raw.ch_names[i]) for i in hbo_picks]
    hbr_names = [base_name(raw.ch_names[i]) for i in hbr_picks]

    # Sanity check: pairs must match
    for i in range(len(hbo_names)):
        if hbo_names[i] != hbr_names[i]:
            raise RuntimeError(f"Channel pairs do not match: {hbo_names[i]} vs {hbr_names[i]}")

    # Identify bad pairs if either channel in pair is bad
    bad_pairs = []
    good_pairs = []
    for i, base in enumerate(hbo_names):
        hbo_ch = raw.ch_names[hbo_picks[i]]
        hbr_ch = raw.ch_names[hbr_picks[i]]
        if (hbo_ch in raw.info['bads']) or (hbr_ch in raw.info['bads']):
            bad_pairs.append(i)
        else:
            good_pairs.append(i)

    print(f"Total pairs: {len(hbo_names)}")
    print(f"Good pairs: {len(good_pairs)}")
    print(f"Bad pairs to interpolate: {len(bad_pairs)}")

    if len(bad_pairs) == 0:
        print("No bad pairs found. Skipping interpolation.")
        return raw

    # Extract locations (use HbO channel loc as pair location)
    locs = np.array([raw.info['chs'][hbo_picks[i]]['loc'][:3] for i in range(len(hbo_names))])
    good_locs = locs[good_pairs]
    bad_locs = locs[bad_pairs]

    # Compute distance matrix between bad and good pairs
    dist_matrix = cdist(bad_locs, good_locs)

    interpolated_pairs = []

    for i, bad_idx in enumerate(bad_pairs):
        bad_base = hbo_names[bad_idx]
        distances = dist_matrix[i]
        close_idxs = np.where(distances < max_dist)[0]

        print(f"\nInterpolating pair {bad_base} (index {bad_idx})")
        print(f"  Nearby good pairs found: {len(close_idxs)}")

        if len(close_idxs) < min_neighbors:
            print(f"  Skipping {bad_base}: not enough neighbors (found {len(close_idxs)} < {min_neighbors})")
            continue

        weights = 1 / (distances[close_idxs] + 1e-6)
        weights /= weights.sum()

        neighbor_hbo_indices = [hbo_picks[good_pairs[idx]] for idx in close_idxs]
        neighbor_hbr_indices = [hbr_picks[good_pairs[idx]] for idx in close_idxs]

        neighbor_hbo_data = raw._data[neighbor_hbo_indices, :]
        neighbor_hbr_data = raw._data[neighbor_hbr_indices, :]

        interpolated_hbo = np.average(neighbor_hbo_data, axis=0, weights=weights)
        interpolated_hbr = np.average(neighbor_hbr_data, axis=0, weights=weights)

        raw._data[hbo_picks[bad_idx]] = interpolated_hbo
        raw._data[hbr_picks[bad_idx]] = interpolated_hbr

        interpolated_pairs.append(bad_base)

    if interpolated_pairs:
        bad_ch_to_remove = []
        for base_ in interpolated_pairs:
            bad_ch_to_remove.append(base_ + f" {hbr_wl}")  # HbR
            bad_ch_to_remove.append(base_ + f" {hbo_wl}")  # HbO

        raw.info['bads'] = [ch for ch in raw.info['bads'] if ch not in bad_ch_to_remove]

    print("\nInterpolation complete.\n")

    for ch in raw.info['bads']:
        print(f"Channel {ch} still marked as bad.")

    print("Bads cleared:", raw.info['bads'])
    fig_raw_after = raw.plot(duration=raw.times[-1], n_channels=raw.info['nchan'], title="After interpolation", show=False)

    return raw, fig_raw_after



def calculate_signal_noise_ratio(data):
    """
    Calculates the signal-to-noise ratio (SNR) for each channel and identifies those below a defined threshold.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.

    Returns
    -------
    tuple[list[str], Figure]
        - list[str]: A list of channel names that fall below the SNR threshold and are considered bad.
        - Figure: A matplotlib Figure showing the channels' SNR values.
    """
    
    print("Calculating signal to noise ratio...")

    # Compute the signal-to-noise ratio values
    print("Computing the signal to noise power...")
    signal_band=(0.01, 0.5)
    noise_band=(1.0, 10.0)
    data_signal = data.copy().filter(*signal_band, verbose=False) #type: ignore
    data_noise = data.copy().filter(*noise_band, verbose=False) #type: ignore
    signal_power = np.mean(data_signal.get_data()**2, axis=1) #type: ignore
    noise_power = np.mean(data_noise.get_data()**2, axis=1) #type: ignore

    # Calculate the snr using the standard formula for dB
    snr = 10 * np.log10(signal_power / (noise_power + np.finfo(float).eps))

    # TODO: Understand what this does
    groups: dict[str, list[str]] = {}
    for ch in getattr(data, "ch_names"):
        # Look for the space in the channel names and remove the characters after
        # This is so we can get both oxy and deoxy to remove, as they will have the same source and detector
        base = ch.rsplit(' ', 1)[0]
        groups.setdefault(base, []).append(ch) # type: ignore

    # If any of the channels do not meet our threshold, they will get inserted into the bad_channels set
    bad_channels: set[str] = set()
    for base, ch_list in groups.items():
        if any(s < SNR_THRESHOLD for s, ch in zip(snr, getattr(data, "ch_names")) if ch in ch_list):
            bad_channels.update(ch_list)

    # Design and create the figure
    print("Creating the figure...")
    snr_fig, ax = plt.subplots(figsize=(12, 4), layout="constrained") # type: ignore
    colors = [(0/20, 'red'), (SNR_THRESHOLD/20, 'red'), ((SNR_THRESHOLD+.5)/20, 'yellow'), ((SNR_THRESHOLD+1)/20, 'green'), (20/20, 'green')]
    cmap = LinearSegmentedColormap.from_list('custom_snr_cmap', colors)
    norm = mcolors.Normalize(vmin=0, vmax=20)
    scatter = ax.scatter(range(len(snr)), snr, c=snr, cmap=cmap, alpha=0.8, s=100, norm=norm) # type: ignore
    ax.set(xlabel="Channel Number",  ylabel="Signal-to-Noise Ratio (dB)", xlim=[0, len(snr)], ylim=[0, 20])
    ax.axhline(SNR_THRESHOLD, color='black', linestyle='--', alpha=0.3, linewidth=1) # type: ignore
    cbar = snr_fig.colorbar(scatter, ax=ax, label="SNR Thresholds (dB)") # type: ignore
    cbar.set_ticks([0, SNR_THRESHOLD, SNR_THRESHOLD+1, 20]) # type: ignore
    cbar.set_ticklabels(['0', str(SNR_THRESHOLD), str(SNR_THRESHOLD+1), '20']) # type: ignore

    plt.close()

    print("Successfully calculated signal to noise ratio.")

    return list(bad_channels), snr_fig




def calculate_peak_power(data: BaseRaw, l_freq: float = 0.7, h_freq: float = 1.5) -> tuple[list[str], Figure, Figure]:
    """
    Calculate peak spectral power (PSP) for fNIRS channels and identify bad channels.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    l_freq : float, optional
        Low cutoff frequency for filtering in Hz (default is 0.7)
    h_freq : float, optional
        High cutoff frequency for filtering in Hz (default is 1.5)

    Returns
    -------
    tuple[list[str], Figure, Figure]
        - list[str]: Names of channels below the PSP threshold.
        - Figure: Heatmap of all PSP scores.
        - Figure: Heatmap of scores above the PSP threshold.
    """

    
    # Compute the PSP
    _, scores, times = cast(tuple[NDArray[float64], NDArray[float64], list[tuple[float]]], peak_power(data, time_window=PSP_TIME_WINDOW, threshold=PSP_THRESHOLD, l_freq=l_freq, h_freq=h_freq))

    # Identify channels that don't meet the provided threshold
    psp = scores.mean(axis=1)
    data.info["bads"] = list(compress(cast(list[str], getattr(data, "ch_names")), psp < PSP_THRESHOLD))

    # Determine the colors based on the threshold, and create the figures
    color_stops = ([0.0, PSP_THRESHOLD, PSP_THRESHOLD+0.1, PSP_THRESHOLD+0.2, 1.0], [0.0, PSP_THRESHOLD, PSP_THRESHOLD, 1.0])
    psp1, psp2 = plot_timechannel_quality_metrics(data, scores, times, color_stops, PSP_THRESHOLD, "Peak Spectral Power")


    return list(compress(cast(list[str], getattr(data, "ch_names")), psp < PSP_THRESHOLD)), psp1, psp2


def mark_bads(raw, bad_sci, bad_snr, bad_psp):
    bads_combined = list(set(bad_snr) | set(bad_sci) | set(bad_psp))
    print(f"Automatically marked bad channels based on SNR and SCI: {bads_combined}")

    raw.info['bads'].extend(bads_combined)

    # Organize channels into categories
    sets = [
        (bad_sci, "SCI"),
        (bad_psp, "PSP"),
        (bad_snr, "SNR"),
    ]

    # Graph what channels were dropped and why they were dropped
    channel_categories: dict[str, str] = {}

    for ch in bads_combined:
        present_in = [name for s, name in sets if ch in s]
        # Create a label for the category
        if len(present_in) == 1:
            label = f"{present_in[0]} only"
        else:
            label = " + ".join(sorted(present_in))
        channel_categories[ch] = label

    # Sort channels alphabetically within categories for nicer visualization
    categories = sorted(set(channel_categories.values()))
    channel_names: list[str] = []
    category_labels: list[str] = []
    for cat in categories:
        chs_in_cat = sorted([ch for ch, c in channel_categories.items() if c == cat])
        channel_names.extend(chs_in_cat)
        category_labels.extend([cat] * len(chs_in_cat))

    colors = {cat: FIXED_CATEGORY_COLORS[cat] for cat in categories}

    # Create the figure
    fig_dropped, ax = plt.subplots(figsize=(10, max(3, len(channel_names) * 0.3))) # type: ignore
    y_pos = range(len(channel_names))
    ax.barh(y_pos, [1]*len(channel_names), color=[colors[cat] for cat in category_labels]) # type: ignore
    ax.set_yticks(y_pos) # type: ignore
    ax.set_yticklabels(channel_names) # type: ignore
    ax.set_xlabel("Marked as Bad") # type: ignore
    ax.set_title(f"Bad Channels by Method for") # type: ignore
    ax.set_xlim(0, 1)
    ax.set_xticks([])  # type: ignore
    ax.grid(axis='x', linestyle='--', alpha=0.7) # type: ignore

    # Add a legend denoting why the channels were bad
    for label, color in colors.items():
        ax.bar(0, 0, color=color, label=label) # type: ignore
    ax.legend() # type: ignore

    fig_dropped.tight_layout()


    raw_before = deepcopy(raw) 
    bads_channels = [ch for ch in raw.ch_names if ch in raw.info['bads']]
    print(bads_channels)
    if bads_channels:
        fig_raw_before = raw_before.plot(duration=raw.times[-1], n_channels=raw.info['nchan'], picks=bads_channels, title="What they were BEFORE", show=False)
    else:
        fig_dropped = None
        fig_raw_before = None

    return raw, fig_dropped, fig_raw_before, bads_channels




def filter_the_data(raw_haemo):
        # --- STEP 5: Filtering (0.01–0.2 Hz bandpass) ---
    fig_filter = raw_haemo.compute_psd(fmax=2).plot(
        average=True, xscale="log", color="r", show=False, amplitude=False
    )

    #raw_haemo = raw_haemo.filter(l_freq=None, h_freq=0.4, h_trans_bandwidth=0.2)
    raw_haemo = raw_haemo.filter(0.05, 0.7, h_trans_bandwidth=0.2, l_trans_bandwidth=0.02)

    raw_haemo.compute_psd(fmax=2).plot(
        average=True, xscale="log", axes=fig_filter.axes, color="g", amplitude=False, show=False
    )

    fig_raw_haemo_filter = raw_haemo.plot(duration=raw_haemo.times[-1], n_channels=raw_haemo.info['nchan'], title="Filtered HbO and HbR", show=False)

    return fig_filter, fig_raw_haemo_filter



def epochs_calculations(raw_haemo, events, event_dict):
    fig_epochs = []  # List to store figures

    # Create epochs from raw data
    epochs = Epochs(raw_haemo, 
                    events, 
                    event_id=event_dict, 
                    tmin=-5, 
                    tmax=15, 
                    baseline=(None, 0))

    # Make a copy of the epochs and drop bad ones
    epochs2 = epochs.copy()
    epochs2.drop_bad()

    # Plot drop log
    # TODO: Why show this if we never use epochs2?
    fig_epochs_dropped = epochs2.plot_drop_log(show=False)
    fig_epochs.append(("fig_epochs_dropped", fig_epochs_dropped))

    # Plot for each condition
    fig, axes = plt.subplots(nrows=1, ncols=1, figsize=(6, 4))
    for idx, condition in enumerate(epochs.event_id.keys()):
        # Plot images for each condition
        fig_epochs_data = epochs[condition].plot_image(
            combine="mean",
            vmin=-1,
            vmax=1,
            ts_args=dict(ylim=dict(hbo=[-1, 1], hbr=[-1, 1])),
            show=False
        )
        for i in fig_epochs_data:
            ax = fig.axes[0]
            original_title = ax.get_title()
            ax.set_title(f"{condition}: {original_title}")
            fig_epochs.append((f"fig_{condition}_data_{idx}", i))  # Store with a unique name

        # Evoked average figure for each condition
        evoked_avg = epochs[condition].average()
        clims = dict(hbo=[-1, 1], hbr=[1, -1])
        condition_fig = evoked_avg.plot_image(clim=clims, show=False)
        
        for ax in condition_fig.axes:
            original_title = ax.get_title()
            ax.set_title(f"{original_title} - {condition}")
        fig_epochs.append((f"evoked_avg_{condition}", condition_fig))  # Store with a unique name

    # Prepare evokeds and colors for topographic plot
    evokeds3 = []
    colors = []
    conditions = list(epochs.event_id.keys())
    cmap = plt.get_cmap("tab10", len(conditions))

    for idx, cond in enumerate(conditions):
        evoked = epochs[cond].average(picks="hbo")
        evokeds3.append(evoked)
        colors.append(cmap(idx))

    # Create the topographic plot
    fig, axes = plt.subplots(nrows=1, ncols=1, figsize=(6, 4))
    help = plot_evoked_topo(evokeds3, color=colors, axes=axes, legend=False, show=False)

    # Build custom legend
    lines = []
    for color in colors:
        line = plt.Line2D([0], [0], color=color, lw=2)
        lines.append(line)

    fig.legend(lines, conditions, loc="lower right")
    fig_epochs.append(("evoked_topo", help))  # Store with a unique name

    unique_annotations = set(raw_haemo.annotations.description)

    for cond in unique_annotations:

        # Evoked response for specific condition ("Activity")
        evoked_stim1 = epochs[cond].average()

        fig_evoked_hbo = evoked_stim1.copy().pick(picks='hbo').plot(time_unit='s', show=False)
        fig_evoked_hbr = evoked_stim1.copy().pick(picks='hbr').plot(time_unit='s', show=False)
        
        fig_epochs.append((f"fig_evoked_hbo_{cond}", fig_evoked_hbo))  # Store with a unique name
        fig_epochs.append((f"fig_evoked_hbr_{cond}", fig_evoked_hbr))  # Store with a unique name

        print("Evoked HbO peak amplitude:", evoked_stim1.copy().pick(picks='hbo').data.max())

    evokeds = {}
    for condition in epochs2.event_id:
        evokeds[condition] = epochs2[condition].average()
        print(f"Condition '{condition}': {len(epochs2[condition])} epochs averaged.")

    all_evokeds = {}
    for condition in epochs.event_id:
        if condition not in all_evokeds:
            all_evokeds[condition] = []
            all_evokeds[condition].append(epochs[condition].average())

    group_aucs = {}
    # TODO: group averages with a single person?
    group_averages = {cond: grand_average(evokeds) for cond, evokeds in all_evokeds.items()}
    for condition, evoked in group_averages.items():
        group_aucs[condition] = {}
        for pick in ["hbo", "hbr"]:
            picks_idx = [i for i, ch in enumerate(evoked.ch_names) if pick in ch]
            if not picks_idx:
                continue

            data = evoked.data[picks_idx, :].mean(axis=0)
            t_start, t_end = 0, 15
            times_mask = (evoked.times >= t_start) & (evoked.times <= t_end)
            data_segment = data[times_mask]
            times_segment = evoked.times[times_mask]

            auc = np.trapezoid(data_segment, times_segment)
            group_aucs[condition][pick] = auc

    # Final evoked comparison plot for each condition
    for condition in conditions:
        if condition not in evokeds:
            continue
        evoked = evokeds[condition]

        fig, ax = plt.subplots(figsize=(6, 5))
        legend_labels = ["Oxyhaemoglobin"]

        for pick, color in zip(["hbo", "hbr"], ["r", "b"]):
            plot_compare_evokeds(
                evoked,
                combine="mean",
                picks=pick,
                axes=ax,
                show=False,
                colors=[color],
                legend=False,
                title=f"Participant: nCondition: {condition}",
                ylim=dict(hbo=[-0.5, 1], hbr=[-0.5, 1]),
                show_sensors=False,
            )
            auc_value = group_aucs.get(condition, {}).get(pick, None)
            if auc_value is not None:
                label = f"{pick.upper()} AUC: {auc_value * 1e6:.4f} µM·s"
            else:
                label = f"{pick.upper()} AUC: N/A"
            legend_labels.append(label)
            if len(legend_labels) == 2:
                legend_labels.append("Deoxyhaemoglobin")

        ax.legend(legend_labels)

        fig_epochs.append((f"fig_{condition}_compare_evokeds", fig))  # Store with a unique name

    return epochs, fig_epochs



def make_design_matrix(raw_haemo, short_chans):

    raw_haemo.resample(1, npad="auto")
    raw_haemo._data = raw_haemo._data * 1e6
    # 2) Create design matrix
    if SHORT_CHANNEL:
        short_chans.resample(1)
        design_matrix = make_first_level_design_matrix(
            raw=raw_haemo,
            hrf_model='fir',
            stim_dur=0.5,
            fir_delays=range(15),
            drift_model='cosine',
            high_pass=0.01,
            oversampling=1,
            min_onset=-125,
            add_regs=short_chans.get_data().T,
            add_reg_names=short_chans.ch_names
        )
    else:
        design_matrix = make_first_level_design_matrix(
            raw=raw_haemo,
            hrf_model='fir',
            stim_dur=0.5,
            fir_delays=range(15),
            drift_model='cosine',
            high_pass=0.01,
            oversampling=1,
            min_onset=-125,
        )

    print(design_matrix.head())
    print(design_matrix.columns)

    
    fig, ax1 = plt.subplots(figsize=(10, 6), constrained_layout=True)
    _ = plot_design_matrix(design_matrix, axes=ax1)

    return design_matrix, fig



def generate_montage_locations():
    """Get standard MNI montage locations in dataframe.

    Data is returned in the same format as the eeg_positions library.
    """
    # standard_1020 and standard_1005 are in MNI (fsaverage) space already,
    # but we need to undo the scaling that head_scale will do
    montage = make_standard_montage(
        "standard_1005", head_size=0.09700884729534559
    )
    for d in montage.dig:
        d["coord_frame"] = 2003
    montage.dig[:] = montage.dig[3:]
    montage.add_mni_fiducials()  # now in fsaverage space
    coords = pd.DataFrame.from_dict(montage.get_positions()["ch_pos"]).T
    coords["label"] = coords.index
    coords = coords.rename(columns={0: "x", 1: "y", 2: "z"})

    return coords.reset_index(drop=True)


def _find_closest_standard_location(position, reference, *, out="label"):
    """Return closest montage label to coordinates.

    Parameters
    ----------
    position : array, shape (3,)
        Coordinates.
    reference : dataframe
        As generated by _generate_montage_locations.
    trans_pos : str
        Apply a transformation to positions to specified frame.
        Use None for no transformation.
    """

    p0 = np.array(position)
    p0.shape = (-1, 3)
    # head_mri_t, _ = _get_trans("fsaverage", "head", "mri")
    # p0 = apply_trans(head_mri_t, p0)
    dists = cdist(p0, np.asarray(reference[["x", "y", "z"]], float))

    if out == "label":
        min_idx = np.argmin(dists)
        return reference["label"][min_idx]
    else:
        assert out == "dists"
        return dists
    


def _source_detector_fold_table(raw, cidx, reference, fold_tbl, interpolate):
    src = raw.info["chs"][cidx]["loc"][3:6]
    det = raw.info["chs"][cidx]["loc"][6:9]

    ref_lab = list(reference["label"])
    dists = _find_closest_standard_location([src, det], reference, out="dists")
    src_min, det_min = np.argmin(dists, axis=1)
    src_name, det_name = ref_lab[src_min], ref_lab[det_min]

    tbl = fold_tbl.query("Source == @src_name and Detector == @det_name")
    dist = np.linalg.norm(dists[[0, 1], [src_min, det_min]])
    # Try reversing source and detector
    if len(tbl) == 0:
        tbl = fold_tbl.query("Source == @det_name and Detector == @src_name")
    if len(tbl) == 0 and interpolate:
        # Try something hopefully not too terrible: pick the one with the
        # smallest net distance
        good = np.isin(fold_tbl["Source"], reference["label"]) & np.isin(
            fold_tbl["Detector"], reference["label"]
        )
        assert good.any()
        tbl = fold_tbl[good]
        assert len(tbl)
        src_idx = [ref_lab.index(src) for src in tbl["Source"]]
        det_idx = [ref_lab.index(det) for det in tbl["Detector"]]
        # Original
        tot_dist = np.linalg.norm([dists[0, src_idx], dists[1, det_idx]], axis=0)
        assert tot_dist.shape == (len(tbl),)
        idx = np.argmin(tot_dist)
        dist_1 = tot_dist[idx]
        src_1, det_1 = ref_lab[src_idx[idx]], ref_lab[det_idx[idx]]
        # And the reverse
        tot_dist = np.linalg.norm([dists[0, det_idx], dists[1, src_idx]], axis=0)
        idx = np.argmin(tot_dist)
        dist_2 = tot_dist[idx]
        src_2, det_2 = ref_lab[det_idx[idx]], ref_lab[src_idx[idx]]
        if dist_1 < dist_2:
            new_dist, src_use, det_use = dist_1, src_1, det_1
        else:
            new_dist, src_use, det_use = dist_2, det_2, src_2


        tbl = fold_tbl.query("Source == @src_use and Detector == @det_use")
        tbl = tbl.copy()
        tbl["BestSource"] = src_name
        tbl["BestDetector"] = det_name
        tbl["BestMatchDistance"] = dist
        tbl["MatchDistance"] = new_dist
        assert len(tbl)
    else:
        tbl = tbl.copy()
        tbl["BestSource"] = src_name
        tbl["BestDetector"] = det_name
        tbl["BestMatchDistance"] = dist
        tbl["MatchDistance"] = dist

    tbl = tbl.copy()  # don't get warnings about setting values later
    return tbl



def _read_fold_xls(fname, atlas="Juelich"):
    """Read fOLD toolbox xls file.

    The values are then manipulated in to a tidy dataframe.

    Note the xls files are not included as no license is provided.

    Parameters
    ----------
    fname : str
        Path to xls file.
    atlas : str
        Requested atlas.
    """
    page_reference = {"AAL2": 2, "AICHA": 5, "Brodmann": 8, "Juelich": 11, "Loni": 14}

    tbl = pd.read_excel(fname, sheet_name=page_reference[atlas])

    # Remove the spacing between rows
    empty_rows = np.where(np.isnan(tbl["Specificity"]))[0]
    tbl = tbl.drop(empty_rows).reset_index(drop=True)

    # Empty values in the table mean its the same as above
    for row_idx in range(1, tbl.shape[0]):
        for col_idx, col in enumerate(tbl.columns):
            if not isinstance(tbl[col][row_idx], str):
                if np.isnan(tbl[col][row_idx]):
                    tbl.iloc[row_idx, col_idx] = tbl.iloc[row_idx - 1, col_idx]

    tbl["Specificity"] = tbl["Specificity"] * 100
    tbl["brainSens"] = tbl["brainSens"] * 100
    return tbl


def _check_load_fold(fold_files, atlas):
    # _validate_type(fold_files, (list, "path-like", None), "fold_files")
    if fold_files is None:
        fold_files = get_config("MNE_NIRS_FOLD_PATH")
        if fold_files is None:
            raise ValueError(
                "MNE_NIRS_FOLD_PATH not set, either set it using "
                "mne.set_config or pass fold_files as str or list"
            )
    if not isinstance(fold_files, list):  # path-like
        fold_files = _check_fname(
            fold_files,
            overwrite="read",
            must_exist=True,
            name="fold_files",
            need_dir=True,
        )
        fold_files = [op.join(fold_files, f"10-{x}.xls") for x in (5, 10)]

    fold_tbl = pd.DataFrame()
    for fi, fname in enumerate(fold_files):
        fname = _check_fname(
            fname, overwrite="read", must_exist=True, name=f"fold_files[{fi}]"
        )
        fold_tbl = pd.concat(
            [fold_tbl, _read_fold_xls(fname, atlas=atlas)], ignore_index=True
        )
    return fold_tbl



def fold_channel_specificity_normal(raw, fold_files=None, atlas="Juelich", interpolate=False):
    """Return the landmarks and specificity a channel is sensitive to.

    Parameters
    
    """  # noqa: E501
    _validate_type(raw, BaseRaw, "raw")

    reference_locations = generate_montage_locations()

    fold_tbl = _check_load_fold(fold_files, atlas)

    chan_spec = list()
    for cidx in range(len(raw.ch_names)):
        tbl = _source_detector_fold_table(
            raw, cidx, reference_locations, fold_tbl, interpolate
        )
        chan_spec.append(tbl.reset_index(drop=True))

    return chan_spec



def resource_path(relative_path):
    """
    Get absolute path to resource regardless of running directly or packaged using PyInstaller
    """

    if hasattr(sys, '_MEIPASS'):
        # PyInstaller bundle path
        base_path = sys._MEIPASS
    else:
        base_path = os.path.abspath(".")

    return os.path.join(base_path, relative_path)



def fold_channels(raw: BaseRaw) -> None:

    # if getattr(sys, 'frozen', False):
    path = os.path.expanduser("~") + "/mne_data/fOLD/fOLD-public-master/Supplementary"
    logger.info(path)
    set_config('MNE_NIRS_FOLD_PATH', resource_path(path)) # type: ignore

    # # Locate the fOLD excel files
    # else:
    #     logger.info("yabba")
    #     set_config('MNE_NIRS_FOLD_PATH', resource_path("../../mne_data/fOLD/fOLD-public-master/Supplementary")) # type: ignore

    output = None

    # List to store the results
    landmark_specificity_data: list[dict[str, Any]] = []

    # Filter the data to only what we want
    hbo_channel_names = cast(list[str], getattr(raw.copy().pick(picks='hbo'), "ch_names")) # type: ignore
    
    # Format the output to make it slightly easier to read

    if True:

        num_channels = len(hbo_channel_names)
        rows, cols = 4, 7  # 6 rows and 4 columns of pie charts
        fig, axes = plt.subplots(rows, cols, figsize=(16, 10), constrained_layout=True)
        axes = axes.flatten()  # Flatten the axes array for easier indexing

        # If more pie charts than subplots, create extra subplots
        if num_channels > rows * cols:
            fig, axes = plt.subplots((num_channels // cols) + 1, cols, figsize=(16, 10), constrained_layout=True)
            axes = axes.flatten()

        # Create a list for consistent color mapping
        landmarks = [
            "1 - Primary Somatosensory Cortex",
            "2 - Primary Somatosensory Cortex",
            "3 - Primary Somatosensory Cortex",
            "4 - Primary Motor Cortex",
            "5 - Somatosensory Association Cortex",
            "6 - Pre-Motor and Supplementary Motor Cortex",
            "7 - Somatosensory Association Cortex",
            "8 - Includes Frontal eye fields",
            "9 - Dorsolateral prefrontal cortex",
            "10 - Frontopolar area",
            "11 - Orbitofrontal area",
            "17 - Primary Visual Cortex (V1)",
            "18 - Visual Association Cortex (V2)",
            "19 - V3",
            "20 - Inferior Temporal gyrus",
            "21 - Middle Temporal gyrus",
            "22 - Superior Temporal Gyrus",
            "23 - Ventral Posterior cingulate cortex",
            "24 - Ventral Anterior cingulate cortex",
            "25 - Subgenual cortex",
            "32 - Dorsal anterior cingulate cortex",
            "37 - Fusiform gyrus",
            "38 - Temporopolar area",
            "39 - Angular gyrus, part of Wernicke's area",
            "40 - Supramarginal gyrus part of Wernicke's area",
            "41 - Primary and Auditory Association Cortex",
            "42 - Primary and Auditory Association Cortex",
            "43 - Subcentral area",
            "44 - pars opercularis, part of Broca's area",
            "45 - pars triangularis Broca's area",
            "46 - Dorsolateral prefrontal cortex",
            "47 - Inferior prefrontal gyrus",
            "48 - Retrosubicular area",
            "Brain_Outside",
        ]

        cmap1 = plt.get_cmap('tab20')  # First 20 colors
        cmap2 = plt.get_cmap('tab20b')  # Next 20 colors

        # Combine the colors from both colormaps
        colors = [cmap1(i) for i in range(20)] + [cmap2(i) for i in range(20)]  # Total 40 colors

        landmarks.sort(key=lambda x: (int(x.split(" - ")[0]) if x.split(" - ")[0].isdigit() else float('inf')))

        landmark_color_map = {landmark: colors[i % len(colors)] for i, landmark in enumerate(landmarks)}

    # Iterate over each channel
    for idx, channel_name in enumerate(hbo_channel_names):
        
        # Run the fOLD on the selected channel
        channel_data = raw.copy().pick(picks=channel_name) # type: ignore

        output = cast(list[DataFrame], fold_channel_specificity_normal(channel_data, interpolate=True, atlas='Brodmann'))

        # Process each DataFrame that fold_channel_specificity returns
        for df_data in output:
            
            # Extract the relevant columns
            useful_data = df_data[['Landmark', 'Specificity']]
            
            # Store the results
            landmark_specificity_data.append({
                'Channel': channel_name,
                'Data': useful_data,
            })


            # Plot the results
            # TODO: Fix this
            if True:
                unique_landmarks = sorted(useful_data['Landmark'].unique())
                color_list = [landmark_color_map[landmark] for landmark in useful_data['Landmark']]

                # Plot specificity for each channel
                ax = axes[idx]

                labels = [f'{landmark.split(" - ")[0]}' if landmark != 'Brain_Outside' else 'B' for landmark in useful_data['Landmark']]

                wedges, texts, autotexts = ax.pie(
                    useful_data['Specificity'],
                    autopct='%1.1f%%',
                    startangle=90,
                    labels=labels, 
                    labeldistance=1.05, 
                    colors=color_list)

                ax.set_title(f'{channel_name}')
                ax.axis('equal')

            landmark_specificity_data = []

    # TODO: Fix this
    if True:
        handles = [
            plt.Line2D([0], [0], marker='o', color='w', label=landmark, markersize=10, 
                    markerfacecolor=landmark_color_map[landmark])
            for landmark in landmarks  
        ]
        n_landmarks = len(landmarks)
        
        # Calculate the figure size based on number of rows and columns
        fig_width = 5
        fig_height = n_landmarks / 4

        # Create a new figure window for the legend
        legend_fig = plt.figure(figsize=(fig_width, fig_height))  
        legend_axes = legend_fig.add_subplot(111)
        legend_axes.axis('off')  # Turn off axis for the legend window
        legend_axes.legend(handles=handles, loc='center', fontsize=10, title="Landmarks")

    for ax in axes[len(hbo_channel_names):]:
        ax.axis('off')
    
    plt.show()
    return fig, legend_fig

                


def individual_significance(raw_haemo, glm_est):

    fig_individual_significances = []  # List to store figures

    # TODO: BAD!
    cha = glm_est.to_dataframe()

    unique_annotations = set(raw_haemo.annotations.description)

    for cond in unique_annotations:

        ch_summary = cha.query(f"Condition.str.startswith('{cond}_delay_') and Chroma == 'hbo'", engine='python')

        print(ch_summary.head())

        channel_averages = ch_summary.groupby('ch_name')['theta'].mean().reset_index()
        print(channel_averages.head())


        activity_ch_summary = ch_summary.query(
            f"Chroma == 'hbo' and Condition.str.startswith('{cond}_delay_')", engine='python'
        )

        # Function to correct p-values per channel
        def fdr_correct_per_channel(df):
            df = df.copy()
            df['pval_fdr'] = multipletests(df['p_value'], method='fdr_bh')[1]
            return df

        # Apply FDR correction grouped by channel
        corrected = activity_ch_summary.groupby("ch_name", group_keys=False).apply(fdr_correct_per_channel)

        # Determine which channels are significant across any delay
        sig_channels = (
            corrected.groupby('ch_name')
            .apply(lambda df: (df['pval_fdr'] < 0.05).any())
            .reset_index(name='significant')
        )

        # Merge with mean theta (optional for plotting)
        mean_theta = activity_ch_summary.groupby('ch_name')['theta'].mean().reset_index()
        sig_channels = sig_channels.merge(mean_theta, on='ch_name')
        print(sig_channels)


        # For example, take the minimum corrected p-value per channel
        summary_pvals = corrected.groupby('ch_name')['pval_fdr'].min().reset_index()
        print(summary_pvals)


        def parse_ch_name(ch_name):
            # Extract numbers after S and D in names like 'S10_D5 hbo'
            match = re.match(r'S(\d+)_D(\d+)', ch_name)
            if match:
                return int(match.group(1)), int(match.group(2))
            else:
                return None, None


        min_pvals = corrected.groupby('ch_name')['pval_fdr'].min().reset_index()

        # Merge the real p-values into sig_channels / avg_df
        avg_df = sig_channels.merge(min_pvals, on='ch_name')

        # Rename columns for consistency
        avg_df = avg_df.rename(columns={'theta': 't_or_theta', 'pval_fdr': 'p_value'})

        # Add Source and Detector columns again
        avg_df['Source'], avg_df['Detector'] = zip(*avg_df['ch_name'].map(parse_ch_name))

        # Keep relevant columns
        avg_df = avg_df[['Source', 'Detector', 't_or_theta', 'p_value']].dropna()

        ABS_SIGNIFICANCE_THETA_VALUE = 1
        ABS_SIGNIFICANCE_T_VALUE = 1
        P_THRESHOLD = 0.05
        SOURCE_DETECTOR_SEPARATOR = "_"

        t_or_theta = 'theta'
        for _, row in avg_df.iterrows(): # type: ignore
            print(f"Source {row['Source']} <-> Detector {row['Detector']}: "
                f"Avg {t_or_theta}-value = {row['t_or_theta']:.3f}, Avg p-value = {row['p_value']:.3f}")

        # Extract the cource and detector positions from raw
        src_pos: dict[int, tuple[float, float]] = {}
        det_pos: dict[int, tuple[float, float]] = {}
        for ch in getattr(raw_haemo, "info")["chs"]:
            ch_name = ch['ch_name']
            if not ch_name or not ch['loc'].any():
                continue
            parts = ch_name.split()[0]
            src_str, det_str = parts.split(SOURCE_DETECTOR_SEPARATOR)
            src_num = int(src_str[1:])
            det_num = int(det_str[1:])
            src_pos[src_num] = ch['loc'][3:5]
            det_pos[det_num] = ch['loc'][6:8]

        # Set up the plot
        fig, ax = plt.subplots(figsize=(8, 6)) # type: ignore

        # Plot the sources
        for pos in src_pos.values():
            ax.scatter(pos[0], pos[1], s=120, c='k', marker='o', edgecolors='white', linewidths=1, zorder=3) # type: ignore

        # Plot the detectors
        for pos in det_pos.values():
            ax.scatter(pos[0], pos[1], s=120, c='k', marker='s', edgecolors='white', linewidths=1, zorder=3) # type: ignore

        # Ensure that the colors stay within the boundaries even if they are over or under the max/min values
        if t_or_theta == 't':
            norm = mcolors.Normalize(vmin=-ABS_SIGNIFICANCE_T_VALUE, vmax=ABS_SIGNIFICANCE_T_VALUE)
        elif t_or_theta == 'theta':
            norm = mcolors.Normalize(vmin=-ABS_SIGNIFICANCE_THETA_VALUE, vmax=ABS_SIGNIFICANCE_THETA_VALUE)

        cmap: mcolors.Colormap = plt.get_cmap('seismic')

        # Plot connections with avg t-values
        for row in avg_df.itertuples():
            src: int = cast(int, row.Source) # type: ignore
            det: int = cast(int, row.Detector)  # type: ignore
            tval: float = cast(float, row.t_or_theta) # type: ignore
            pval: float = cast(float, row.p_value) # type: ignore
            

            if src in src_pos and det in det_pos:
                x = [src_pos[src][0], det_pos[det][0]]
                y = [src_pos[src][1], det_pos[det][1]]
                style = '-' if pval <= P_THRESHOLD else '--'
                ax.plot(x, y, linestyle=style, color=cmap(norm(tval)), linewidth=4, alpha=0.9, zorder=2) # type: ignore

        # Format the Colorbar
        sm = plt.cm.ScalarMappable(cmap=cmap, norm=norm)
        sm.set_array([])
        cbar = plt.colorbar(sm, ax=ax, shrink=0.85) # type: ignore
        cbar.set_label(f'Average {cond} {t_or_theta} value (hbo)', fontsize=11) # type: ignore

        # Formatting the subplots
        ax.set_aspect('equal')
        ax.set_title(f"Average {t_or_theta} values for {cond} (HbO)", fontsize=14) # type: ignore
        ax.set_xlabel('X position (m)', fontsize=11) # type: ignore
        ax.set_ylabel('Y position (m)', fontsize=11) # type: ignore
        ax.grid(True, alpha=0.3) # type: ignore

        # Set axis limits to be 1cm more than the optode positions
        all_x = [pos[0] for pos in src_pos.values()] + [pos[0] for pos in det_pos.values()]
        all_y = [pos[1] for pos in src_pos.values()] + [pos[1] for pos in det_pos.values()]
        ax.set_xlim(min(all_x)-0.01, max(all_x)+0.01)
        ax.set_ylim(min(all_y)-0.01, max(all_y)+0.01)

        fig.tight_layout()
        
        fig_individual_significances.append((f"Condition {cond}", fig))

    return fig_individual_significances

# TODO: Hardcoded
def group_significance(
    raw_haemo,
    all_cha: pd.DataFrame,
    condition: str,
    correction: str = "fdr_bh"
) -> plt.Figure:
    """
    Compute group-level significance using weighted Stouffer's method and plot results.

    Args:
        raw_haemo: Raw haemoglobin MNE object (used for optode positions)
        all_cha: DataFrame with columns including 'ID', 'Condition', 'p_value', 'theta', 'df', 'ch_name', 'Chroma'
        condition: condition prefix, e.g., 'Activity'
        correction: p-value correction method ('fdr_bh' or 'bonferroni')

    Returns:
        Matplotlib Figure with group-level theta values and significance.
    """

    assert "ID" in all_cha.columns, "'ID' column missing in input data"
    assert len(raw_haemo) >= 1, "At least one raw haemoglobin object is required"

    condition_prefix = f"{condition}_delay"

    # Filter relevant data
    ch_summary = all_cha.query(
        "Condition.str.startswith(@condition_prefix) and Chroma == 'hbo'",
        engine='python'
    ).copy()


    logger.info("=== ch_summary head ===")
    logger.info(ch_summary.head())

    logger.info("\nSummary stats:")
    logger.info(f"Total rows: {len(ch_summary)}")
    logger.info(f"Unique subjects: {ch_summary['ID'].nunique() if 'ID' in ch_summary.columns else 'ID column missing'}")
    logger.info(f"Unique conditions: {ch_summary['Condition'].unique()}")
    logger.info(f"Unique channels (Source-Detector pairs): {ch_summary.groupby(['Source', 'Detector']).ngroups}")

    logger.info("\nSample p_values:")
    logger.info(ch_summary['p_value'].describe())

    if ch_summary.empty:
        raise ValueError(f"No data found for condition prefix: {condition_prefix}")

    # --- For debugging
    logger.info(f"Total rows after filtering for condition '{condition_prefix}': {len(ch_summary)}")
    logger.info(f"Unique channels: {ch_summary['ch_name'].nunique()}")
    logger.info(f"Participants: {ch_summary['ID'].nunique()}")

    # Step 1: Select the peak regressor (~6s after stimulus onset)
    peak_regressor = f"{condition}_delay_6"
    peak_data = ch_summary[ch_summary["Condition"] == peak_regressor].copy()

    logger.info(f"\n=== Logging all values for {peak_regressor} ===")
    for row in peak_data.itertuples(index=False):
        logger.info(
            f"Subject: {row.ID}, "
            f"Channel: {row.ch_name}, "
            f"Source: {row.Source}, Detector: {row.Detector}, "
            f"theta: {row.theta:.4f}, "
            f"p_value: {row.p_value:.6f}, "
            f"df: {row.df}"
        )

    if peak_data.empty:
        raise ValueError(f"No data found for peak regressor: {peak_regressor}")

    # Step 2: Combine per-channel stats across subjects
    group_results = []

    for (src, det), group in peak_data.groupby(["Source", "Detector"]):
        pvals = group["p_value"].values
        thetas = group["theta"].values
        dfs = group["df"].values

        # Weighted Stouffer's method
        weights = np.sqrt(dfs)
        z_scores = norm.isf(pvals)
        combined_z = np.sum(weights * z_scores) / np.sqrt(np.sum(weights**2))
        combined_p = norm.sf(combined_z)

        theta_avg = np.average(thetas, weights=weights)

        group_results.append({
            "Source": src,
            "Detector": det,
            "theta_avg": theta_avg,
            "combined_p": combined_p
        })

    # Step 3: Create combined_df
    combined_df = pd.DataFrame(group_results)

    # Step 4: Multiple comparisons correction
    _, pvals_corr, _, significant = multipletests(
        combined_df["combined_p"], alpha=0.05, method=correction
    )

    combined_df["pval_corr"] = pvals_corr
    combined_df["significant"] = significant

    logger.info(f"Used peak regressor: {peak_regressor}")
    logger.info(f"Channels tested: {len(combined_df)}")
    logger.info(f"Significant channels after correction: {combined_df['significant'].sum()}")
    # Get optode positions from the first raw file
    raw = raw_haemo
    src_pos, det_pos = {}, {}
    for ch in raw.info["chs"]:
        ch_name = ch["ch_name"]
        if not ch_name or not ch["loc"].any():
            continue
        parts = ch_name.split()[0]
        src_str, det_str = parts.split("_")
        src_num = int(src_str[1:])
        det_num = int(det_str[1:])
        src_pos[src_num] = ch["loc"][3:5]
        det_pos[det_num] = ch["loc"][6:8]

    # Plotting parameters
    ABS_SIGNIFICANCE_THETA_VALUE = 1
    P_THRESHOLD = 0.05
    cmap = plt.get_cmap("seismic")
    norm = mcolors.Normalize(vmin=-ABS_SIGNIFICANCE_THETA_VALUE, vmax=ABS_SIGNIFICANCE_THETA_VALUE)

    fig, ax = plt.subplots(figsize=(8, 6))

    # Plot optodes
    for pos in src_pos.values():
        ax.scatter(*pos, s=120, c="k", marker="o", edgecolors="white", linewidths=1, zorder=3)
    for pos in det_pos.values():
        ax.scatter(*pos, s=120, c="k", marker="s", edgecolors="white", linewidths=1, zorder=3)

    # Plot connections colored by average theta, solid if significant
    for row in combined_df.itertuples():
        src, det = int(row.Source), int(row.Detector)
        tval, pval = row.theta_avg, row.pval_corr
        if src in src_pos and det in det_pos:
            x = [src_pos[src][0], det_pos[det][0]]
            y = [src_pos[src][1], det_pos[det][1]]
            linestyle = "-" if pval <= P_THRESHOLD else "--"
            ax.plot(x, y, linestyle=linestyle, color=cmap(norm(tval)), linewidth=4, alpha=0.9, zorder=2)

    # Colorbar
    sm = plt.cm.ScalarMappable(cmap=cmap, norm=norm)
    sm.set_array([])
    cbar = plt.colorbar(sm, ax=ax, shrink=0.85)
    cbar.set_label(f"Average {condition_prefix.rstrip('_')} θ-value (HbO)", fontsize=11)

    # Format axes
    ax.set_aspect("equal")
    ax.set_title(f"Group-level θ-values for {condition_prefix.rstrip('_')} (HbO)", fontsize=14)
    ax.set_xlabel("X position (m)", fontsize=11)
    ax.set_ylabel("Y position (m)", fontsize=11)
    ax.grid(True, alpha=0.3)

    all_x = [p[0] for p in src_pos.values()] + [p[0] for p in det_pos.values()]
    all_y = [p[1] for p in src_pos.values()] + [p[1] for p in det_pos.values()]
    ax.set_xlim(min(all_x) - 0.01, max(all_x) + 0.01)
    ax.set_ylim(min(all_y) - 0.01, max(all_y) + 0.01)

    fig.tight_layout()
    fig.show()




def plot_glm_results(file_path, raw_haemo, glm_est, design_matrix):
    
    fig_glms = []  # List to store figures

    dm = design_matrix.copy()
    logger.info(design_matrix.shape)
    logger.info(design_matrix.columns)
    logger.info(design_matrix.head())

    rois = dict(AllChannels=range(len(raw_haemo.ch_names)))
    conditions = design_matrix.columns
    df_individual = glm_est.to_dataframe_region_of_interest(rois, conditions)
    
    df_individual["ID"] = file_path
    # df_individual["theta"] = [t * 1.0e6 for t in df_individual["theta"]]

    first_onset_for_cond = {}
    for onset, desc in zip(raw_haemo.annotations.onset, raw_haemo.annotations.description):
        if desc not in first_onset_for_cond:
            first_onset_for_cond[desc] = onset

    # Get unique condition names from annotations (descriptions)
    unique_annotations = set(raw_haemo.annotations.description)

    for cond in unique_annotations:
        logger.info(cond)
        df_individual_filtered = df_individual.copy()

        # Filter for the condition of interest and FIR delays
        df_individual_filtered["isCondition"] = [cond in n for n in df_individual_filtered["Condition"]]
        df_individual_filtered["isDelay"] = ["delay" in n for n in df_individual_filtered["Condition"]]
        df_individual_filtered = df_individual_filtered.query("isDelay and isCondition")
        
        # Remove other conditions from design matrix
        dm_condition_cols = [col for col in dm.columns if cond in col]
        dm_cond = dm[dm_condition_cols]
            
        # Add a numeric delay column
        def extract_delay_number(condition_str):
            # Extracts the number at the end of a string like 'Activity_delay_5'
            return int(condition_str.split("_")[-1])

        df_individual_filtered["DelayNum"] = df_individual_filtered["Condition"].apply(extract_delay_number)

        # Now separate and sort using numeric delay
        df_hbo = df_individual_filtered[df_individual_filtered["Chroma"] == "hbo"].sort_values("DelayNum")
        df_hbr = df_individual_filtered[df_individual_filtered["Chroma"] == "hbr"].sort_values("DelayNum")

        vals_hbo = df_hbo["theta"].values
        vals_hbr = df_hbr["theta"].values
        
        # Create the plot
        fig, axes = plt.subplots(nrows=1, ncols=3, figsize=(19, 10))
        
        # Scale design matrix components using numpy arrays instead of pandas operations
        dm_cond_values = dm_cond.values
        dm_cond_scaled_hbo = dm_cond_values * vals_hbo.reshape(1, -1)
        dm_cond_scaled_hbr = dm_cond_values * vals_hbr.reshape(1, -1)
        
        # Create time axis relative to stimulus onset
        time = dm_cond.index - np.ceil(first_onset_for_cond.get(cond, 0))
        
        # Plot
        axes[0].plot(time, dm_cond_values)
        axes[1].plot(time, dm_cond_scaled_hbo)
        axes[2].plot(time, np.sum(dm_cond_scaled_hbo, axis=1), 'r')
        axes[2].plot(time, np.sum(dm_cond_scaled_hbr, axis=1), 'b')
        
        # Format plots
        for ax in range(3):
            axes[ax].set_xlim(-5, 25)
            axes[ax].set_xlabel("Time (s)")
        axes[0].set_ylim(-0.2, 1.2)
        axes[1].set_ylim(-0.5, 1)
        axes[2].set_ylim(-0.5, 1)
        axes[0].set_title(f"FIR Model (Unscaled)")
        axes[1].set_title(f"FIR Components (Scaled by {cond} GLM Estimates)")
        axes[2].set_title(f"Evoked Response ({cond})")
        axes[0].set_ylabel("FIR Model")
        axes[1].set_ylabel("Oxyhaemoglobin (ΔμMol)")
        axes[2].set_ylabel("Haemoglobin (ΔμMol)")
        axes[2].legend(["Oxyhaemoglobin", "Deoxyhaemoglobin"])

        
        print(f"Number of FIR bins: {len(vals_hbo)}")
        print(f"Mean theta (HbO): {np.mean(vals_hbo):.4f}")
        print(f"Sum of theta (HbO): {np.sum(vals_hbo):.4f}")
        print(f"Mean theta (HbR): {np.mean(vals_hbr):.4f}")
        print(f"Sum of theta (HbR): {np.sum(vals_hbr):.4f}")
        
        fig_glms.append((f"Condition {cond}", fig))

    return fig_glms


def plot_3d_evoked_array(
    inst: Union[BaseRaw, EvokedArray, Info],
    statsmodel_df: DataFrame,
    picks: Optional[Union[str, list[str]]] = "hbo",
    value: str = "Coef.",
    background: str = "w",
    figure: Optional[object] = None,
    clim: Union[str, dict[str, Union[str, list[float]]]] = "auto",
    mode: str = "weighted",
    colormap: str = "RdBu_r",
    surface: str = "pial",
    hemi: str = "both",
    size: int = 800,
    view: Optional[Union[str, dict[str, float]]] = None,
    colorbar: bool = True,
    distance: float = 0.03,
    subjects_dir: Optional[str] = None,
    src: Optional[SourceSpaces] = None,
    verbose: bool = False,
) -> Brain:
    '''Ported from MNE'''

    info: Info = cast(Info, deepcopy(inst if isinstance(inst, Info) else inst.info)) # type: ignore
    if not (getattr(info, "ch_names") == list(statsmodel_df["ch_name"].values)): # type: ignore
        raise RuntimeError(
            'MNE data structure does not match dataframe '
            f'results.\nMNE = {getattr(info, "ch_names")}.\n'
            f'GLM = {list(statsmodel_df["ch_name"].values)}' # type: ignore
        )

    ea = EvokedArray(np.tile(statsmodel_df[value].values.T, (1, 1)).T, info.copy()) # type: ignore

    # TODO: mimic behaviour of other MNE-NIRS glm plotting options
    if picks is not None:
        ea = ea.pick(picks=picks) # type: ignore

    if subjects_dir is None:
        subjects_dir = os.environ["SUBJECTS_DIR"]
    if src is None:
        fname_src_fs = os.path.join(
            subjects_dir, "fsaverage", "bem", "fsaverage-ico-5-src.fif"
        )
        src = read_source_spaces(fname_src_fs, verbose=verbose)

    picks = getattr(ea, "info")["ch_names"]

    # Set coord frame
    for idx in range(len(getattr(ea, "ch_names"))):
        getattr(ea, "info")["chs"][idx]["coord_frame"] = 4

    # Generate source estimate
    kwargs = dict(
        evoked=ea,
        subject="fsaverage",
        trans=Transform('head', 'mri', np.eye(4)),
        distance=distance,
        mode=mode,
        surface=surface,
        subjects_dir=subjects_dir,
        src=src,
        project=True,
    )

    stc = stc_near_sensors(picks=picks, **kwargs, verbose=verbose) # type: ignore

    assert isinstance(stc, SourceEstimate)

    # Produce brain plot
    brain: Brain = stc.plot( # type: ignore
        src=src,
        subjects_dir=subjects_dir,
        hemi=hemi,
        surface=surface,
        initial_time=0,
        clim=clim, # type: ignore
        size=size,
        colormap=colormap,
        figure=figure,
        background=background,
        colorbar=colorbar,
        verbose=verbose,
    )
    if view is not None:
        brain.show_view(view) # type: ignore

    return brain



def brain_3d_visualization(raw_haemo, df_cha, selected_event, t_or_theta: Literal['t', 'theta'] = 'theta', show_optodes: Literal['sensors', 'labels', 'none', 'all'] = 'all', show_text: bool = True, brain_bounds: float = 1.0) -> None:

    clim = dict(kind="value", pos_lims=(0, brain_bounds/2, brain_bounds))

    # Get all activity conditions
    for cond in [f'{selected_event}']:

        if True:
            ch_summary = df_cha.query(f"Condition.str.startswith('{cond}_delay_') and Chroma == 'hbo'", engine='python') # type: ignore

        # Use ordinary least squares (OLS) if only one participant
        # TODO: Fix.
        if True:

            # t values
            if t_or_theta == 't':
                ch_model = smf.ols("t ~ -1 + ch_name", ch_summary).fit() # type: ignore

            # theta values
            elif t_or_theta == 'theta':
                ch_model = smf.ols("theta ~ -1 + ch_name", ch_summary).fit() # type: ignore

            print("OLS model is being used as there is only one participant!")

        # Convert model results
        model_df = cast(DataFrame, statsmodels_to_results(ch_model, order=ch_summary["ch_name"].unique())) # type: ignore
    
        valid_channels = ch_summary["ch_name"].unique().tolist() # type: ignore
        raw_for_plot = raw_haemo.copy().pick(picks=valid_channels) # type: ignore

        brain = plot_3d_evoked_array(raw_for_plot.pick(picks="hbo"), model_df, view="dorsal", distance=0.02, colorbar=True, clim=clim, mode="weighted", size=(800, 700)) # type: ignore
        
        if show_optodes == 'all' or show_optodes == 'sensors':
            brain.add_sensors(getattr(raw_for_plot, "info"), trans=Transform('head', 'mri', np.eye(4)), fnirs=["channels", "pairs", "sources", "detectors"], verbose=False) # type: ignore
        
        if True:
            display_text = ('Folder: '  + '\nGroup: ' + '\nCondition: '+ cond + '\nShort Channel Regression: ' 
                            + '\nLooking at: ' + t_or_theta + ' values') + '\nBrain Distance: '

        # Apply the text onto the brain
        if show_text:
            brain.add_text(0.12, 0.64, display_text, "title", font_size=11, color="k") # type: ignore

        return brain




def brain_landmarks_3d(raw_haemo: BaseRaw, show_optodes: Literal['sensors', 'labels', 'none', 'all'] = 'all', show_brodmann: bool = True) -> None:

    brain = Brain("fsaverage", background="white", size=(800, 700))  # type: ignore

    distances = source_detector_distances(raw_haemo.info)

    # Add optode text labels manually
    if show_optodes == 'all' or show_optodes == 'sensors':
        brain.add_sensors(getattr(raw_haemo, "info"), trans=Transform('head', 'mri', np.eye(4)), fnirs=["channels", "pairs", "sources", "detectors"], verbose=False) # type: ignore
    
    if show_optodes == 'all' or show_optodes == 'labels':
        labeled_srcs = set()
        labeled_dets = set()
        label_counts = {}

        for idx, ch in enumerate(raw_haemo.info['chs']):
            ch_name = ch['ch_name']

            if not ch_name.endswith('hbo'):
                continue

            loc = ch['loc']
            logger.info(f"Channel: {ch_name}")
            logger.info(f"loc length: {len(loc)}")
            logger.info("loc contents:")
            for i, val in enumerate(loc):
                logger.info(f"  loc[{i}]: {val}")
            logger.info("-" * 30)
            if not ch_name or not ch['loc'].any():
                continue
            
            parts = ch_name.split()[0]
            src_str, det_str = parts.split('_')
            
            src_num = int(src_str[1:])
            det_num = int(det_str[1:])
            
            if src_num not in labeled_srcs:
                src_xyz = ch['loc'][3:6] * 1000
                brain._renderer.text3d(src_xyz[0], src_xyz[1], src_xyz[2], src_str,
                                    color='red', scale=0.002)
                labeled_srcs.add(src_num)
            
            if det_num not in labeled_dets:
                det_xyz = ch['loc'][6:9] * 1000
                brain._renderer.text3d(det_xyz[0], det_xyz[1], det_xyz[2], det_str,
                                    color='blue', scale=0.002)
                labeled_dets.add(det_num)

            # Get the source-detector distance for this channel (in meters)
            dist_m = distances[idx]
            dist_mm = dist_m * 1000

            label_text = f"{dist_mm:.1f} mm"
            label_counts[label_text] = label_counts.get(label_text, 0) + 1
            if label_counts[label_text] > 1:
                label_text += f" ({label_counts[label_text]})"
            
            # Label at channel midpoint
            mid_xyz = loc[0:3] * 1000

            logger.info(f"Channel: {ch_name} | Midpoint (mm): x={mid_xyz[0]:.2f}, y={mid_xyz[1]:.2f}, z={mid_xyz[2]:.2f} | Distance: {dist_mm:.1f} mm")

            brain._renderer.text3d(
                mid_xyz[0], mid_xyz[1], mid_xyz[2],
                label_text,
                color='gray',
                scale=0.002
            )

    
    if show_brodmann:# Add Brodmann labels
        labels = cast(list[Label], read_labels_from_annot("fsaverage", "PALS_B12_Brodmann", "rh", verbose=False)) # type: ignore

        label_colors = {
            "Brodmann.39-rh": "blue",
            "Brodmann.40-rh": "green",
            "Brodmann.6-rh": "pink",
            "Brodmann.7-rh": "orange",
            "Brodmann.17-rh": "red",
            "Brodmann.1-rh": "yellow",
            "Brodmann.2-rh": "yellow",
            "Brodmann.3-rh": "yellow",
            "Brodmann.18-rh": "red",
            "Brodmann.19-rh": "red",
            "Brodmann.4-rh": "purple",
            "Brodmann.8-rh": "white"
        }

        for label in labels:
            name = getattr(label, "name", None)
            if not isinstance(name, str):
                continue
            if name in label_colors:
                brain.add_label(label, borders=False, color=label_colors[name]) # type: ignore


    return brain


def verify_channel_positions(data: BaseRaw) -> None:
    """
    Visualizes the sensor/channel positions of the raw data for verification.

    Parameters
    ----------
    data : BaseRaw
        The loaded data object to process.
    """

def convert_fig_dict_to_png_bytes(fig_dict: dict[str, Figure]) -> dict[str, bytes]:
    png_dict = {}
    for label, fig in fig_dict.items():
        buf = BytesIO()
        fig.savefig(buf, format="png", bbox_inches="tight")
        buf.seek(0)
        png_dict[label] = buf.read()
        plt.close(fig)
    return png_dict



def brain_3d_contrast(con_model_df: DataFrame, con_model_df_filtered: BaseRaw, common_channels: list[str], first_name: str, second_name: str, t_or_theta: Literal['t', 'theta'] = 'theta', show_optodes: Literal['sensors', 'labels', 'none', 'all'] = 'all', show_text: bool = True, brain_bounds: float = 1.0) -> None:
    # Filter DataFrame to only common channels, and sort by raw order
    con_model = con_model_df

    con_model["ch_name"] = pd.Categorical(
        con_model["ch_name"], categories=common_channels, ordered=True
    )
    con_model = con_model.sort_values("ch_name").reset_index(drop=True) # type: ignore


    clim=dict(kind="value", pos_lims=(0, brain_bounds/2, brain_bounds))

    # Plot brain figure
    brain = plot_3d_evoked_array(con_model_df_filtered.copy().pick(picks="hbo"), con_model, view="dorsal", distance=0.02, colorbar=True, mode="weighted", clim=clim, size=(800, 700), verbose=False) # type: ignore

    if show_optodes == 'all' or show_optodes == 'sensors':
        brain.add_sensors(getattr(con_model_df_filtered, "info"), trans=Transform('head', 'mri', np.eye(4)), fnirs=["channels", "pairs", "sources", "detectors"], verbose=False) # type: ignore
   
    display_text = ('Contrast: ' + first_name + ' - ' + second_name + '\nLooking at: ' + t_or_theta + ' values')

    # Apply the text onto the brain
    if show_text:
        brain.add_text(0.12, 0.70, display_text, "title", font_size=11, color="k") # type: ignore
 


def plot_2d_3d_contrasts_between_groups(
    contrast_df_a: pd.DataFrame,
    contrast_df_b: pd.DataFrame,
    raw_haemo: BaseRaw,
    group_a_name: str,
    group_b_name: str,
    is_3d: bool = True,
    t_or_theta: Literal['t', 'theta'] = 'theta',
    show_optodes: Literal['sensors', 'labels', 'none', 'all'] = 'all',
    show_text: bool = True,
    brain_bounds: float = 1.0,
) -> None:


    logger.info("-----")
    contrast_df_a = contrast_df_a.copy()
    contrast_df_a["group"] = group_a_name
    contrast_df_b = contrast_df_b.copy()
    contrast_df_b["group"] = group_b_name
    logger.info("-----")

    df_combined = pd.concat([contrast_df_a, contrast_df_b], ignore_index=True)

    con_summary = df_combined.query("Chroma == 'hbo'").copy()
    logger.info("-----")

    valid_channels = (pd.crosstab(con_summary["group"], con_summary["ch_name"]) > 1).all()
    valid_channels = valid_channels[valid_channels].index.tolist()
    con_summary = con_summary[con_summary["ch_name"].isin(valid_channels)]
    logger.info("-----")

    model_formula = "effect ~ -1 + group:ch_name:Chroma"
    con_model = smf.mixedlm(model_formula, con_summary, groups=con_summary["ID"]).fit(method="nm")
    logger.info("-----")

    if t_or_theta == "t":
        group1_vals = con_model.tvalues.filter(like=f"group[{group_a_name}]")
        group2_vals = con_model.tvalues.filter(like=f"group[{group_b_name}]")
    else:
        group1_vals = con_model.params.filter(like=f"group[{group_a_name}]")
        group2_vals = con_model.params.filter(like=f"group[{group_b_name}]")
    logger.info("-----")

    group1_channels = [name.split(":")[1].split("[")[1].split("]")[0] for name in group1_vals.index]
    group2_channels = [name.split(":")[1].split("[")[1].split("]")[0] for name in group2_vals.index]

    df_group1 = DataFrame({"Coef.": group1_vals.values}, index=group1_channels)
    df_group2 = DataFrame({"Coef.": group2_vals.values}, index=group2_channels)

    df_contrast = df_group1.join(df_group2, how="inner", lsuffix=f"_{group_a_name}", rsuffix=f"_{group_b_name}")
    logger.info("-----")

    # A - B
    df_contrast["Coef."] = df_contrast[f"Coef._{group_a_name}"] - df_contrast[f"Coef._{group_b_name}"]
    con_model_df_1_2 = DataFrame({
        "ch_name": df_contrast.index,
        "Coef.": df_contrast["Coef."],
        "Chroma": "hbo"
    })
    logger.info("-----")

    mne_ch_names = raw_haemo.copy().pick(picks="hbo").ch_names
    glm_ch_names = con_model_df_1_2["ch_name"].tolist()
    common_channels = [ch for ch in mne_ch_names if ch in glm_ch_names]

    con_model_df_filtered = raw_haemo.copy().pick(picks=common_channels)
    con_model_df_1_2 = con_model_df_1_2.set_index("ch_name").loc[common_channels].reset_index()
    logger.info("-----")

    if is_3d:
        brain_3d_contrast(
            con_model_df_1_2,
            con_model_df_filtered,
            common_channels,
            group_a_name,
            group_b_name,
            t_or_theta,
            show_optodes,
            show_text,
            brain_bounds
        )
    else:
        plot_glm_group_topo(con_model_df_filtered.copy().pick(picks="hbo"), con_model_df_1_2, names=True, res=128, vlim=(-brain_bounds, brain_bounds)) # type: ignore

        # TODO: The title currently goes on the colorbar. Low priority
        plt.title(f"Contrast: {group_a_name} vs {group_b_name}") # type: ignore
        plt.show() # type: ignore

    # plt.title(f"Contrast: {group_a_name} vs {group_b_name}")
    # plt.show()

    # B - A
    df_contrast["Coef."] = df_contrast[f"Coef._{group_b_name}"] - df_contrast[f"Coef._{group_a_name}"]
    con_model_df_2_1 = DataFrame({
        "ch_name": df_contrast.index,
        "Coef.": df_contrast["Coef."],
        "Chroma": "hbo"
    })

    glm_ch_names = con_model_df_2_1["ch_name"].tolist()
    common_channels = [ch for ch in mne_ch_names if ch in glm_ch_names]

    con_model_df_filtered = raw_haemo.copy().pick(picks=common_channels)
    con_model_df_2_1 = con_model_df_2_1.set_index("ch_name").loc[common_channels].reset_index()

    if is_3d:
        brain_3d_contrast(
        con_model_df_2_1,
        con_model_df_filtered,
        common_channels,
        group_b_name,
        group_a_name,
        t_or_theta,
        show_optodes,
        show_text,
        brain_bounds
    )
    else:
        plot_glm_group_topo(con_model_df_filtered.copy().pick(picks="hbo"), con_model_df_2_1, names=True, res=128, vlim=(-brain_bounds, brain_bounds)) # type: ignore

        # TODO: The title currently goes on the colorbar. Low priority
        plt.title(f"Contrast: {group_b_name} vs {group_a_name}") # type: ignore
        plt.show() # type: ignore




def plot_fir_model_results(df, raw_haemo, dm, selected_event, l_bound, u_bound):


    df["isActivity"] = [f"{selected_event}" in n for n in df["Condition"]]
    df["isDelay"] = ["delay" in n for n in df["Condition"]]
    df = df.query("isDelay in [True]")
    df = df.query("isActivity in [True]")
    # Make a new column that stores the condition name for tidier model below
    df.loc[:, "TidyCond"] = ""
    df.loc[df["isActivity"] == True, "TidyCond"] = f"{selected_event}"  # noqa: E712
    # Finally, extract the FIR delay in to its own column in data frame
    df.loc[:, "delay"] = [n.split("_")[-1] for n in df.Condition]

    # To simplify this example we will only look at the activity
    # condition so we now remove the other conditions from the
    # design matrix and GLM results
    dm_cols_activity = np.where([f"{selected_event}" in c for c in dm.columns])[0]
    dm = dm[[dm.columns[i] for i in dm_cols_activity]]

    lme = smf.mixedlm("theta ~ -1 + delay:TidyCond:Chroma", df, groups=df["ID"]).fit()

    df_sum = statsmodels_to_results(lme)
    df_sum["delay"] = [int(n) for n in df_sum["delay"]]
    df_sum = df_sum.sort_values("delay")

    # Print the result for the oxyhaemoglobin data in the target condition
    df_sum.query(f"TidyCond in ['{selected_event}']").query("Chroma in ['hbo']")


    fig, axes = plt.subplots(nrows=1, ncols=3, figsize=(19, 10))

    print("dm columns:", dm.columns.tolist())

    # Extract design matrix columns that correspond to the condition of interest
    dm_cond_idxs = np.where([f"{selected_event}" in n for n in dm.columns])[0]
    dm_cond = dm[[dm.columns[i] for i in dm_cond_idxs]]

    # Extract the corresponding estimates from the lme dataframe for hbo
    df_hbo = df_sum.query(f"TidyCond in ['{selected_event}']").query("Chroma in ['hbo']")
    vals_hbo = [float(v) for v in df_hbo["Coef."]]

    # print("--------------------------------------")
    # print(f"dm_cond shape: {dm_cond.shape}")
    # print(f"dm_cond columns: {dm_cond.columns.tolist()}")
    # print(f"vals_hbo length: {len(vals_hbo)}")
    # print(f"vals_hbo sample: {vals_hbo[:5]}")
    # print(f"vals_hbo type: {type(vals_hbo)}")
    # print(f"vals_hbo element type: {type(vals_hbo[0]) if len(vals_hbo) > 0 else 'N/A'}")

    dm_cond_scaled_hbo = dm_cond * vals_hbo

    # Extract the corresponding estimates from the lme dataframe for hbr
    df_hbr = df_sum.query(f"TidyCond in ['{selected_event}']").query("Chroma in ['hbr']")
    vals_hbr = [float(v) for v in df_hbr["Coef."]]
    dm_cond_scaled_hbr = dm_cond * vals_hbr

    first_onset = None
    for desc, onset in zip(raw_haemo.annotations.description, raw_haemo.annotations.onset):
        if selected_event in desc:
            first_onset = onset
            break

    if first_onset is None:
        raise ValueError(f"Selected event '{selected_event}' not found in annotations.")

    # Align index values (time axis) to the first occurrence of selected_event
    index_values = dm_cond_scaled_hbo.index - np.ceil(first_onset)
    index_values = np.asarray(index_values)

    # Plot the result
    axes[0].plot(index_values, np.asarray(dm_cond))
    axes[1].plot(index_values, np.asarray(dm_cond_scaled_hbo))
    axes[2].plot(index_values, np.sum(dm_cond_scaled_hbo, axis=1), "r")
    axes[2].plot(index_values, np.sum(dm_cond_scaled_hbr, axis=1), "b")

    valid_mask = (index_values >= 0) & (index_values <= 15)
    hbo_sum_window = np.sum(dm_cond_scaled_hbo.loc[valid_mask, :], axis=1)
    peak_idx_in_window = np.argmax(hbo_sum_window)
    peak_idx = np.where(valid_mask)[0][peak_idx_in_window]
    peak_time = float(round(index_values[peak_idx], 2)) # type: ignore

    axes[2].axvline(x=peak_time, color='k', linestyle='--', linewidth=1.5, label='Peak time') # type: ignore

    # Format the plot
    for ax in range(3):
        axes[ax].set_xlim(-5, 25)
        axes[ax].set_xlabel("Time (s)")
    axes[0].set_ylim(-0.1, 1.1)
    axes[1].set_ylim(l_bound, u_bound)
    axes[2].set_ylim(l_bound, u_bound)
    axes[0].set_title("FIR Model (Unscaled by GLM estimates)")
    axes[1].set_title(f"FIR Components (Scaled by {selected_event} GLM Estimates)")
    axes[2].set_title(f"Evoked Response {selected_event}")
    axes[0].set_ylabel("FIR Model")
    axes[1].set_ylabel("Oyxhaemoglobin (ΔμMol)")
    axes[2].set_ylabel("Haemoglobin (ΔμMol)")
    axes[2].legend(["Oyxhaemoglobin", "Deoyxhaemoglobin"])

    # We can also extract the 95% confidence intervals of the estimates too
    l95_hbo = [float(v) for v in df_hbo["[0.025"]] # type: ignore
    u95_hbo = [float(v) for v in df_hbo["0.975]"]] # type: ignore
    dm_cond_scaled_hbo_l95 = dm_cond * l95_hbo
    dm_cond_scaled_hbo_u95 = dm_cond * u95_hbo
    l95_hbr = [float(v) for v in df_hbr["[0.025"]] # type: ignore
    u95_hbr = [float(v) for v in df_hbr["0.975]"]] # type: ignore
    dm_cond_scaled_hbr_l95 = dm_cond * l95_hbr
    dm_cond_scaled_hbr_u95 = dm_cond * u95_hbr

    axes2: Axes
    fig2, axes2 = plt.subplots(nrows=1, ncols=1, figsize=(7, 7)) # type: ignore

    # Plot the result
    axes2.plot(index_values, np.sum(dm_cond_scaled_hbo, axis=1), "r") # type: ignore
    axes2.plot(index_values, np.sum(dm_cond_scaled_hbr, axis=1), "b") # type: ignore
    axes2.axvline(x=peak_time, color='k', linestyle='--', linewidth=1.5, label='Peak time') # type: ignore

    axes2.fill_between( # type: ignore
        index_values,
        np.asarray(np.sum(dm_cond_scaled_hbo_l95, axis=1)),
        np.asarray(np.sum(dm_cond_scaled_hbo_u95, axis=1)),
        facecolor="red",
        alpha=0.25,
    )
    axes2.fill_between( # type: ignore
        index_values,
        np.asarray(np.sum(dm_cond_scaled_hbr_l95, axis=1)),
        np.asarray(np.sum(dm_cond_scaled_hbr_u95, axis=1)),
        facecolor="blue",
        alpha=0.25,
    )

    # Format the plot
    axes2.set_xlim(-5, 20)
    axes2.set_ylim(l_bound, u_bound)
    axes2.set_title(f"Evoked Response with 95% confidence intervals for )") # type: ignore
    axes2.set_ylabel("Haemoglobin (ΔμMol)") # type: ignore
    axes2.legend(["Oyxhaemoglobin", "Deoyxhaemoglobin", f"Peak {peak_time}s"]) # type: ignore
    axes2.set_xlabel("Time (s)") # type: ignore

    fig2.tight_layout()

    fig.show()
    fig2.show()



def load_snirf(file_path: str) -> tuple[BaseRaw, Figure]:
    """
    Loads a snirf file, optionally drops channels, downsamples, and creates a figure showing the results.

    Parameters
    ----------
    file_path : str
        Path of the snirf file to load.
    ID : str
        File name of the the snirf file that was loaded.
    drop_prefixes : list[str]
        List of channel name prefixes to drop from the data.

    Returns
    -------
    tuple[BaseRaw, Figure]
        - BaseRaw: The processed data object.
        - Figure: The corresponding Matplotlib figure.
    """
    
    # Read the snirf file
    raw = read_raw_snirf(file_path, preload=True, verbose=VERBOSITY) # type: ignore
    raw.load_data(verbose=VERBOSITY) # type: ignore

    # Strip the specified amount of seconds from the start of the file
    total_duration = getattr(raw, "times")[-1]
    if total_duration > SECONDS_TO_STRIP:
        raw.crop(tmin=SECONDS_TO_STRIP, tmax=total_duration, verbose=VERBOSITY) # type: ignore
        logger.info(f"Stripped first {SECONDS_TO_STRIP} second(s) of data.")
    else:
        logger.info(f"Data length ({total_duration:.2f}s) less than strip duration; no cropping applied.")

    # If the user forcibly dropped channels, remove them now before any processing occurs
    # logger.info("Checking if there are channels to forcibly drop...")
    # if drop_prefixes:
    #     logger.info("Force dropped channels was specified.")
    #     channels_to_drop = [ch for ch in cast(list[str], getattr(raw, "ch_names")) if any(ch.startswith(prefix) for prefix in drop_prefixes)]
    #     raw.drop_channels(channels_to_drop, "raise") # type: ignore
    #     logger.info("Force dropped channels:", channels_to_drop)

    # If the user wants to downsample, do it right away
    logger.info("Checking if we should downsample...")
    if DOWNSAMPLE:
        logger.info("Downsample was specified.")
        sfreq_old = getattr(raw, "info")["sfreq"]
        raw.resample(DOWNSAMPLE_FREQUENCY, verbose=VERBOSITY) # type: ignore
        sfreq_new = getattr(raw, "info")["sfreq"]
        logger.info(f"Finished downsampling. Old frequency: {sfreq_old}. New frequency: {sfreq_new}.")

    logger.info("Successfully loaded the snirf file.")

    return raw


def run_second_level_analysis(df_contrasts, raw, p, bounds):
    """
    Perform second-level analysis using contrast data from multiple participants.

    Parameters
    ----------
    df_contrasts : pd.DataFrame
        Combined contrast results from multiple participants.
        Must include: ['ch_name', 'effect', 'ID']

    Returns
    -------
    pd.DataFrame
        Group-level t-values, p-values, and mean effect per channel.
    """

    if not all(col in df_contrasts.columns for col in ['ch_name', 'effect', 'ID']):
        raise ValueError("Input DataFrame must include 'ch_name', 'effect', and 'ID' columns.")

    channels = df_contrasts['ch_name'].unique()
    group_results = []

    for ch in channels:
        ch_data = df_contrasts[df_contrasts['ch_name'] == ch]

        if ch_data['ID'].nunique() < 2:
            logger.warning(f"Skipping channel {ch} — not enough subjects.")
            continue

        Y = ch_data['effect'].values
        design_matrix = np.ones((len(Y), 1))  # intercept-only
        model = OLSModel(design_matrix)
        result = model.fit(Y)

        t_val = result.t(0).item()
        p_val = 2 * stats.t.sf(np.abs(t_val), df=result.df_model)
        mean_beta = np.mean(Y)

        group_results.append({
            'ch_name': ch,
            't_val': t_val,
            'p_val': p_val,
            'mean_beta': mean_beta,
            'n_subjects': len(Y)
        })

    df_group = pd.DataFrame(group_results)
    logger.info("Second-level results:\n%s", df_group)


    # Extract the cource and detector positions from raw
    src_pos: dict[int, tuple[float, float]] = {}
    det_pos: dict[int, tuple[float, float]] = {}
    for ch in getattr(raw, "info")["chs"]:
        ch_name = ch['ch_name']
        if not ch_name or not ch['loc'].any():
            continue
        parts = ch_name.split()[0]
        src_str, det_str = parts.split('_')
        src_num = int(src_str[1:])
        det_num = int(det_str[1:])
        src_pos[src_num] = ch['loc'][3:5]
        det_pos[det_num] = ch['loc'][6:8]

    # Set up the plot
    fig, ax = plt.subplots(figsize=(8, 6)) # type: ignore

    # Plot the sources
    for pos in src_pos.values():
        ax.scatter(pos[0], pos[1], s=120, c='k', marker='o', edgecolors='white', linewidths=1, zorder=3) # type: ignore

    # Plot the detectors
    for pos in det_pos.values():
        ax.scatter(pos[0], pos[1], s=120, c='k', marker='s', edgecolors='white', linewidths=1, zorder=3) # type: ignore

    # Ensure that the colors stay within the boundaries even if they are over or under the max/min values
    norm = mcolors.Normalize(vmin=-bounds, vmax=bounds)

    cmap: mcolors.Colormap = plt.get_cmap('seismic')

    # Plot connections with avg t-values
    for _, row in df_group.iterrows():
        ch = row['ch_name']
        pval = row['p_val']
        tval = row['t_val']

        if '_' not in ch:
            logger.info(f"Skipping channel with unexpected format (no underscore): {ch}")
            continue

        src_str, det_str = ch.split('_')
        det_parts = det_str.split()
        detector_id = det_parts[0]  # e.g. "D1"
        hemo_type = det_parts[1].lower() if len(det_parts) > 1 else ''

        logger.info(f"Parsing channel: {ch} -> src_str: {src_str}, det_str: {detector_id}, hemo_type: {hemo_type}")

        if hemo_type != 'hbo':
            logger.info(f"Skipping channel {ch} because hemo_type is not HbO: {hemo_type}")
            continue

        try:
            src = int(src_str[1:])
            det = int(detector_id[1:])
            logger.info(f"Parsed src: {src}, det: {det}")

        except Exception as e:
            logger.info(f"Error parsing source/detector from channel '{ch}': {e}")
            continue

        if src in src_pos and det in det_pos:
            x = [src_pos[src][0], det_pos[det][0]]
            y = [src_pos[src][1], det_pos[det][1]]
            style = '-' if pval <= p else '--'
            color = cmap(norm(tval))
            logger.info(f"Plotting {ch}: t={tval:.2f}, p={pval:.3f}, color={color}, style={style}")
            ax.plot(x, y, linestyle=style, color=color, linewidth=4, alpha=0.9, zorder=2)


    # Format the Colorbar
    sm = plt.cm.ScalarMappable(cmap=cmap, norm=norm)
    sm.set_array([])
    cbar = plt.colorbar(sm, ax=ax, shrink=0.85) # type: ignore
    cbar.set_label(f'Average value (hbo)', fontsize=11) # type: ignore

    # Formatting the subplots
    ax.set_aspect('equal')
    ax.set_title(f"Average values (HbO)", fontsize=14) # type: ignore
    ax.set_xlabel('X position (m)', fontsize=11) # type: ignore
    ax.set_ylabel('Y position (m)', fontsize=11) # type: ignore
    ax.grid(True, alpha=0.3) # type: ignore

    # Set axis limits to be 1cm more than the optode positions
    all_x = [pos[0] for pos in src_pos.values()] + [pos[0] for pos in det_pos.values()]
    all_y = [pos[1] for pos in src_pos.values()] + [pos[1] for pos in det_pos.values()]
    ax.set_xlim(min(all_x)-0.01, max(all_x)+0.01)
    ax.set_ylim(min(all_y)-0.01, max(all_y)+0.01)

    fig.tight_layout()
    plt.show() # type: ignore

    return df_group


def calculate_dpf(file_path):
    # order is hbo / hbr
    with h5py.File(file_path, 'r') as f:
        wavelengths = f['/nirs/probe/wavelengths'][:]
        logger.info(f"Wavelengths (nm): {wavelengths}")
    wavelengths = sorted(wavelengths, reverse=True)
    age = float(AGE)
    logger.info(f"Their age was {AGE}")
    a = 223.3
    b = 0.05624
    c = 0.8493
    d = -5.723e-7
    e = 0.001245
    f = -0.9025
    dpf = []
    for w in wavelengths:
        logger.info(w)
        dpf.append(a + b * (age**c) + d* (w**3) + e * (w**2) + f*w)
    logger.info(dpf)
    return dpf



def process_participant(file_path, progress_callback=None):

    fig_individual: dict[str, Figure] = {}

    # Step 1: Load
    raw = load_snirf(file_path)
    fig_raw = raw.plot(duration=raw.times[-1], n_channels=raw.info['nchan'], title="Loaded Raw", show=False)
    fig_individual["Loaded Raw"] = fig_raw
    if progress_callback: progress_callback(1)
    logger.info("1")

    # Step 1.5: Verify optode positions
    fig_optodes = raw.plot_sensors(show_names=True, to_sphere=True, show=False) # type: ignore
    fig_individual["Plot Sensors"] = fig_optodes
    if progress_callback: progress_callback(2)
    logger.info("2")

    # Step 2: Downsample
    # raw = raw.resample(0.5)  # Downsample to 0.5 Hz

    # Step 2: Bad from SCI
    bad_sci = []
    if SCI:
        bad_sci, fig_sci_1, fig_sci_2 = calculate_scalp_coupling(raw)
        fig_individual["SCI1"] = fig_sci_1
        fig_individual["SCI2"] = fig_sci_2
    if progress_callback: progress_callback(3)
    logger.info("3")

    # Step 2: Bad from SNR
    bad_snr = []
    if SNR:
        bad_snr, fig_snr = calculate_signal_noise_ratio(raw)
        fig_individual["SNR1"] = fig_snr
    if progress_callback: progress_callback(4)
    logger.info("4")

    # Step 3: Bad from PSP
    bad_psp = []
    if PSP:
        bad_psp, fig_psp1, fig_psp2 = calculate_peak_power(raw)
        fig_individual["PSP1"] = fig_psp1
        fig_individual["PSP2"] = fig_psp2
    if progress_callback: progress_callback(5)
    logger.info("5")

    # Step 4: Mark the bad channels
    raw, fig_dropped, fig_raw_before, bad_channels = mark_bads(raw, bad_sci, bad_snr, bad_psp)
    if fig_dropped and fig_raw_before is not None:
        fig_individual["fig2"] = fig_dropped
        fig_individual["fig3"] = fig_raw_before
    if progress_callback: progress_callback(6)
    logger.info("6")

    # Step 5: Interpolate the bad channels
    if bad_channels:
        raw, fig_raw_after = interpolate_fNIRS_bads_weighted_average(raw, bad_channels)
        fig_individual["fig4"] = fig_raw_after
    if progress_callback: progress_callback(7)
    logger.info("7")

    # Step 6: Optical Density
    raw_od = optical_density(raw)
    fig_raw_od = raw_od.plot(duration=raw.times[-1], n_channels=raw.info['nchan'], title="Optical Density", show=False)
    fig_individual["Optical Density"] = fig_raw_od
    if progress_callback: progress_callback(8)
    logger.info("8")

    # Step 7: TDDR
    if TDDR:
        raw_od = temporal_derivative_distribution_repair(raw_od)
        fig_raw_od_tddr = raw_od.plot(duration=raw.times[-1], n_channels=raw.info['nchan'], title="After TDDR (Motion Correction)", show=False)
        fig_individual["TDDR"] = fig_raw_od_tddr
    if progress_callback: progress_callback(9)
    logger.info("9")

    # Step 8: BLL
    raw_haemo = beer_lambert_law(raw_od, ppf=calculate_dpf(file_path))
    fig_raw_haemo_bll = raw_haemo.plot(duration=raw_haemo.times[-1], n_channels=raw_haemo.info['nchan'], title="HbO and HbR Signals", show=False)
    fig_individual["BLL"] = fig_raw_haemo_bll
    if progress_callback: progress_callback(10)
    logger.info("10")

    # Step 9: ENC
    # raw_haemo = enhance_negative_correlation(raw_haemo)
    # fig_raw_haemo_enc = raw_haemo.plot(duration=raw_haemo.times[-1], n_channels=raw_haemo.info['nchan'], title="HbO and HbR Signals", show=False)
    # fig_individual.append(fig_raw_haemo_enc)

    # Step 10: Filter
    fig_filter, fig_raw_haemo_filter = filter_the_data(raw_haemo)
    fig_individual["filter1"] = fig_filter
    fig_individual["filter2"] = fig_raw_haemo_filter
    if progress_callback: progress_callback(11)
    logger.info("11")

    # Step 11: Get short / long channels
    if SHORT_CHANNEL:
        short_chans = get_short_channels(raw_haemo, max_dist=0.015)
        fig_short_chans = short_chans.plot(duration=raw_haemo.times[-1], n_channels=raw_haemo.info['nchan'], title="Short Channels Only", show=False)
        fig_individual["short"] = fig_short_chans
    else:
        short_chans = None
    raw_haemo = get_long_channels(raw_haemo)
    if progress_callback: progress_callback(12)
    logger.info("12")

    # Step 12: Events from annotations
    events, event_dict = events_from_annotations(raw_haemo)
    fig_events = plot_events(events, event_id=event_dict, sfreq=raw_haemo.info["sfreq"], show=False)
    fig_individual["events"] = fig_events
    if progress_callback: progress_callback(13)
    logger.info("13")

    # Step 13: Epoch calculations
    epochs, fig_epochs = epochs_calculations(raw_haemo, events, event_dict)
    for name, fig in fig_epochs:  # Unpack the tuple here
        fig_individual[f"epochs_{name}"] = fig  # Store only the figure, not the name
    if progress_callback: progress_callback(14)
    logger.info("14")

    # Step 14: Design Matrix
    events_to_remove = REMOVE_EVENTS
        
    filtered_annotations = [ann for ann in raw.annotations if ann['description'] not in events_to_remove]
    
    new_annot = Annotations(
        onset=[ann['onset'] for ann in filtered_annotations],
        duration=[ann['duration'] for ann in filtered_annotations],
        description=[ann['description'] for ann in filtered_annotations]
    )
    
    # Set the new annotations
    raw_haemo.set_annotations(new_annot)

    design_matrix, fig_design_matrix = make_design_matrix(raw_haemo, short_chans)
    fig_individual["Design Matrix"] = fig_design_matrix
    if progress_callback: progress_callback(15)
    logger.info("15")

    # Step 15: Run GLM
    glm_est = run_glm(raw_haemo, design_matrix)
    # Not used AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\nilearn\glm\contrasts.py
    # Yes used AppData\Local\Packages\PythonSoftwareFoundation.Python.3.13_qbz5n2kfra8p0\LocalCache\local-packages\Python313\site-packages\mne_nirs\utils\_io.py

    # The p-value is calculated from this t-statistic using the Student’s t-distribution with appropriate degrees of freedom.
    # p_value = 2 * stats.t.cdf(-abs(t_statistic), df)
    # It is a two-tailed p-value.
    # It says how likely it is to observe the effect you did (or something more extreme) if the true effect was zero (null hypothesis).
    # A small p-value (e.g., < 0.05) suggests the effect is unlikely to be zero — it’s "statistically significant."
    # A large p-value means the data do not provide strong evidence that the effect is different from zero.


    if progress_callback: progress_callback(16)
    logger.info("16")

    # Step 16: Plot GLM results
    fig_glm_result = plot_glm_results(file_path, raw_haemo, glm_est, design_matrix)
    for name, fig in fig_glm_result:
        fig_individual[f"GLM {name}"] = fig
    if progress_callback: progress_callback(17)
    logger.info("17")

    # Step 17: Plot channel significance
    fig_significance = individual_significance(raw_haemo, glm_est)
    for name, fig in fig_significance:
        fig_individual[f"Significance {name}"] = fig
    if progress_callback: progress_callback(18)
    logger.info("18")

    # Step 18: cha, con, roi
    cha = glm_est.to_dataframe()

    # HACK: Comment out line 588 (self._renderer.show()) in _brain.py from MNE
    # brain_thing = brain_3d_visualization(cha, raw_haemo)
    # brain_individual.append(brain_thing)
    # C++ objects made this get rendered on the fly

    rois = dict(AllChannels=range(len(raw_haemo.ch_names)))
    # Calculate ROI for all conditions
    conditions = design_matrix.columns
    # Compute output metrics by ROI
    df_ind = glm_est.to_dataframe_region_of_interest(rois, conditions)

    df_ind["ID"] = file_path

    # Step 18: Fold channels
    # fig_fold_data, fig_fold_legend = fold_channels(raw_haemo)
    # fig_individual.append(fig_fold_data)
    # fig_individual.append(fig_fold_legend)
    print(design_matrix)

          
    contrast_matrix = np.eye(design_matrix.shape[1])
    basic_conts = dict(
        [(column, contrast_matrix[i]) for i, column in enumerate(design_matrix.columns)]
    )

    all_delay_cols = [col for col in design_matrix.columns if "_delay_" in col]
    all_conditions = sorted({col.split("_delay_")[0] for col in all_delay_cols})

    if not all_conditions:
        raise ValueError("No FIR regressors found in the design matrix.")

    # Build contrast vectors for each condition
    contrast_dict = {}

    for condition in all_conditions:
        delay_cols = [
            col for col in all_delay_cols
            if col.startswith(f"{condition}_delay_") and
            TIME_WINDOW_START <= int(col.split("_delay_")[-1]) <= TIME_WINDOW_END
        ]

        if not delay_cols:
            continue  # skip if no columns found (shouldn't happen?)

        # Average across all delay regressors for this condition
        contrast_vector = np.sum([basic_conts[col] for col in delay_cols], axis=0)
        contrast_vector /= len(delay_cols)

        contrast_dict[condition] = contrast_vector

    if progress_callback: progress_callback(19)
    logger.info("19")

    # Compute contrast results
    contrast_results = {}

    for cond, contrast_vector in contrast_dict.items():
        contrast = glm_est.compute_contrast(contrast_vector)  # type: ignore
        df = contrast.to_dataframe()
        df["ID"] = file_path
        contrast_results[cond] = df

    cha["ID"] = file_path
    
    fig_bytes = convert_fig_dict_to_png_bytes(fig_individual)

    if progress_callback: progress_callback(20)
    logger.info("20")
        
    sanitize_paths_for_pickle(raw_haemo, epochs)

    return raw_haemo, epochs, fig_bytes, cha, contrast_results, df_ind, design_matrix, AGE, GENDER, GROUP, True

def sanitize_paths_for_pickle(raw_haemo, epochs):
    # Fix raw_haemo._filenames
    if hasattr(raw_haemo, '_filenames'):
        raw_haemo._filenames = [str(p) for p in raw_haemo._filenames]

    # Fix epochs._raw._filenames
    if hasattr(epochs, '_raw') and hasattr(epochs._raw, '_filenames'):
        epochs._raw._filenames = [str(p) for p in epochs._raw._filenames]