# workers.py
import flares

# This function must be completely standalone. 
# No PyQt imports here!
def run_fold_process(haemo_obj, label, shared_dict):
    """
    Runs in a separate OS process. 
    Writes progress to shared_dict so the GUI can see it.
    """
    try:
        def progress_callback(value):
            # Only update shared memory if the value has changed
            # This significantly reduces "noise" on the GUI thread
            if shared_dict.get(label) != value:
                shared_dict[label] = value

        # Run the heavy calculation
        # Ensure 'flares' logic does not try to open any plots/GUIs itself!
        figures = flares.fold_channels(haemo_obj, progress_callback=progress_callback)
        
        
    except Exception as e:
        # If something breaks here, we return the error string 
        # so the main thread knows what happened.
        return f"ERROR: {str(e)}"