"""
Basic Test Plugin
Creates a widget window and registers submenu items under the Plugins menu.
"""

from PySide6.QtGui import QAction
from PySide6.QtWidgets import QLabel, QMenu, QMessageBox, QPushButton, QVBoxLayout, QWidget


class PluginWidget(QWidget):
    """Custom widget UI owned by the plugin."""

    def __init__(self, parent: QWidget | None = None) -> None:
        super().__init__(parent)
        self.setWindowTitle("Test Plugin Window")
        self.resize(350, 200)

        layout = QVBoxLayout(self)

        label = QLabel("Hello from the Test Plugin!", self)
        btn_action = QPushButton("Click Me", self)
        btn_action.clicked.connect(self._on_button_clicked)

        layout.addWidget(label)
        layout.addWidget(btn_action)

    def _on_button_clicked(self) -> None:
        QMessageBox.information(self, "Plugin Interactive", "Button inside the plugin QWidget was clicked!")


class Plugin:
    """Plugin entry point contract loaded by the main application."""

    def __init__(self, main_window: QWidget) -> None:
        self.main_window = main_window
        self.name = "Test Plugin"
        self.widget_instance: PluginWidget | None = None

    def register_menu(self, plugin_menu: QMenu) -> None:
        """
        Populates the plugin's dedicated submenu in the main menubar.
        Called by the main app after creating the submenu header.
        """
        open_action = QAction("Open Tool Window", self.main_window)
        open_action.triggered.connect(self.show_widget)

        about_action = QAction("About Test Plugin", self.main_window)
        about_action.triggered.connect(self.show_about)

        plugin_menu.addAction(open_action)
        plugin_menu.addAction(about_action)

    def show_widget(self) -> None:
        """Instantiates and displays the plugin's QWidget window."""
        if self.widget_instance is None or not self.widget_instance.isVisible():
            self.widget_instance = PluginWidget()
            self.widget_instance.show()
        else:
            self.widget_instance.raise_()
            self.widget_instance.activateWindow()

    def show_about(self) -> None:
        """Secondary menu action example."""
        QMessageBox.about(
            self.main_window,
            "About Test Plugin",
            "This is a basic test plugin demonstrating submenu registration and custom QWidget window spawning.",
        )