import sys
from pathlib import Path

from PySide6.QtCore import QSettings
from PySide6.QtWidgets import QApplication

import build_info
from audio.system_volume import set_volume
from themes import THEME_DAY, THEME_NIGHT
from ui.language_dialog import LanguageDialog
from ui.main_window_new import MainWindowNew


def run_app():
    app = QApplication(sys.argv)
    _apply_reset_if_requested()
    _ensure_language_selected(app)
    _apply_startup_sound_defaults()
    _apply_startup_display_defaults()
    window = MainWindowNew(app)
    window.show()
    sys.exit(app.exec())


def _apply_startup_sound_defaults():
    settings = QSettings("car_ui", "ui")
    base_volume = build_info.DEFAULT_SOUND_VOLUME
    premute_volume = build_info.DEFAULT_PREMUTE_VOLUME
    ducking_volume = build_info.DEFAULT_DUCKING_VOLUME

    if not settings.contains("sound/base_volume"):
        settings.setValue("sound/base_volume", base_volume)
    if not settings.contains("sound/premute_volume"):
        settings.setValue("sound/premute_volume", premute_volume)
    if not settings.contains("sound/ducking_volume"):
        settings.setValue("sound/ducking_volume", ducking_volume)

    applied_volume = settings.value("sound/base_volume", base_volume)
    try:
        applied_volume = int(applied_volume)
    except (TypeError, ValueError):
        applied_volume = base_volume
    set_volume(applied_volume)


def _apply_startup_display_defaults():
    settings = QSettings("car_ui", "ui")
    if not settings.contains("display/brightness"):
        settings.setValue("display/brightness", 70)
    if not settings.contains("display/auto_brightness"):
        settings.setValue("display/auto_brightness", False)
    if not settings.contains("display/theme"):
        settings.setValue("display/theme", "night")


def _apply_reset_if_requested():
    reset_marker = Path(__file__).resolve().parent / "reset"
    if not reset_marker.exists():
        return
    settings = QSettings("car_ui", "ui")
    settings_path = Path(settings.fileName())
    if settings_path.exists():
        settings_path.unlink()
    reset_marker.unlink()


def _ensure_language_selected(app: QApplication):
    settings = QSettings("car_ui", "ui")
    if settings.contains("ui/language"):
        return
    theme_key = settings.value("display/theme", "night")
    app.setStyleSheet(THEME_NIGHT if theme_key != "day" else THEME_DAY)
    dialog = LanguageDialog()
    if dialog.exec() == LanguageDialog.Accepted:
        settings.setValue("ui/language", dialog.selected_language())