import sys
from pathlib import Path

from PySide6.QtQml import QQmlApplicationEngine
from PySide6.QtQuickControls2 import QQuickStyle
from PySide6.QtWidgets import QApplication

from pygui.backend.device_controller import DeviceController
from pygui.backend.local_settings import LocalSettings
from pygui.backend.local_settings_model import LocalSettingsModel
from pygui.backend.file_browser import FileBrowser


# ===== Application Entry Point =====
def main() -> int:
    # ===== UI Style Setup =====
    # Use a non-native controls style so our custom QML button backgrounds are supported.
    QQuickStyle.setStyle("Basic")

    # ===== Qt Bootstrap =====
    # Minimal Qt bootstrap: load the ISC QML module and exit if it fails.
    app = QApplication(sys.argv)
    engine = QQmlApplicationEngine()

    # ===== Shared Models =====
    settings_model = LocalSettingsModel()
    select_file_dialog_model = FileBrowser()
    settings_model.loadSettings()
    engine.rootContext().setContextProperty("settingsModel", settings_model)
    engine.rootContext().setContextProperty("file_browser", select_file_dialog_model)

    # ===== Device Controller (serial comm) =====
    data_dir = str(settings_model._data_dir)
    raw_settings = LocalSettings.read_settings(data_dir)
    device_controller = DeviceController(raw_settings, data_dir)
    engine.rootContext().setContextProperty("deviceController", device_controller)

    # ===== QML Startup =====
    # The "ISC" QML module lives alongside this file (src/pygui/ISC), so the
    # package directory is the import path the engine searches for qmldir.
    engine.addImportPath(Path(__file__).parent)
    engine.loadFromModule("ISC", "Main")

    # ===== Exit Handling =====
    if not engine.rootObjects():
        return -1

    return app.exec()


if __name__ == "__main__":
    sys.exit(main())