import os
import sys
import json
import ctypes
import logging

LOG_FORMAT = "%(asctime)s [%(levelname)s] %(name)s: %(message)s"
LOG_DATE_FORMAT = "%Y-%m-%d %H:%M:%S"

MUTEX_NAME = r"Global\WallpaperChanger_SingleInstance"
ERROR_ALREADY_EXISTS = 183


def _bootstrap():
    import config

    app_dir = config._get_app_dir()
    for d in ["assets", "cache", "logs"]:
        os.makedirs(os.path.join(app_dir, d), exist_ok=True)

    config_path = config._get_config_path()
    if not os.path.exists(config_path):
        with open(config_path, "w", encoding="utf-8") as f:
            json.dump(config.DEFAULT_CONFIG, f, indent=4, ensure_ascii=False)


def _do_refresh():
    logging.basicConfig(
        level=logging.INFO,
        format=LOG_FORMAT,
        datefmt=LOG_DATE_FORMAT,
    )
    logger = logging.getLogger("refresh")

    import config
    import fetcher
    import wallpaper

    try:
        image_path = fetcher.fetch_wallpaper()
        fill_style = config.get("wallpaper.fill_style", "fill")
        wallpaper.set_wallpaper(image_path, fill_style)
        logger.info("Wallpaper updated successfully")
    except Exception as e:
        logger.error("Refresh failed: %s", e)
        sys.exit(1)


def _setup_logging():
    import config

    log_dir = os.path.join(config._get_app_dir(), "logs")
    os.makedirs(log_dir, exist_ok=True)
    log_file = os.path.join(log_dir, "app.log")
    logging.basicConfig(
        level=logging.INFO,
        format=LOG_FORMAT,
        datefmt=LOG_DATE_FORMAT,
        handlers=[
            logging.FileHandler(log_file, encoding="utf-8"),
            logging.StreamHandler(sys.stdout),
        ],
    )


def _ensure_icon():
    import config

    icon_path = os.path.join(config._get_app_dir(), "assets", "icon.ico")
    if os.path.exists(icon_path):
        return
    from PIL import Image

    img = Image.new("RGB", (64, 64), color=(66, 133, 244))
    sizes = [(16, 16), (32, 32), (48, 48), (64, 64)]
    img.save(icon_path, format="ICO", sizes=sizes)


def _check_single_instance():
    handle = ctypes.windll.kernel32.CreateMutexW(None, False, MUTEX_NAME)
    if ctypes.windll.kernel32.GetLastError() == ERROR_ALREADY_EXISTS:
        ctypes.windll.user32.MessageBoxW(0, "程序已运行", "壁纸更换器", 0x40)
        return False
    return True


def main():
    _bootstrap()

    if "--refresh" in sys.argv:
        _do_refresh()
        return

    if not _check_single_instance():
        return

    _setup_logging()
    logger = logging.getLogger("main")

    try:
        _ensure_icon()
    except Exception as e:
        logger.warning("Failed to generate icon: %s", e)

    from tray_app import TrayApp

    app = TrayApp()
    logger.info("Starting Wallpaper Changer...")
    app.run()


if __name__ == "__main__":
    main()