import sys
import time
from PyQt6.QtCore import Qt
from PyQt6.QtWidgets import QApplication
from db.database import init_db
from ui.dock import PanelWindow, _set_autostart
from ui.ball import FloatBall, BALL_SIZE
import ui.theme as theme
from db import database


def _wake_existing_or_exit() -> bool:
    """
    Windows 单实例：
    - 若已有进程在运行：唤醒已有窗口并返回 False（当前进程退出）
    - 若无已有进程：返回 True（继续正常启动）
    """
    if sys.platform != "win32":
        return True

    import ctypes
    import ctypes.wintypes

    mutex_name = r"Global\CleanDesktopOrganizerSingleton"
    title = "牛马软件柜"

    kernel32 = ctypes.windll.kernel32
    user32 = ctypes.windll.user32

    ERROR_ALREADY_EXISTS = 183
    h_mutex = kernel32.CreateMutexW(None, False, mutex_name)
    if not h_mutex:
        return True

    last_err = kernel32.GetLastError()
    if last_err == ERROR_ALREADY_EXISTS:
        # 轮询一小段时间，避免首次窗口尚未创建
        hwnd = None
        for _ in range(8):  # ~2.4s
            hwnd = user32.FindWindowW(None, title)
            if hwnd:
                break
            time.sleep(0.3)

        if hwnd:
            # SW_SHOW = 5
            user32.ShowWindow(hwnd, 5)
            user32.SetForegroundWindow(hwnd)
        return False

    return True


def main():
    # 必须在创建 QApplication 之前：不按各显示器缩放，逻辑像素固定（跨分辨率/跨屏拖动宽高保持一致）
    if not _wake_existing_or_exit():
        return
    QApplication.setAttribute(Qt.ApplicationAttribute.AA_Use96Dpi, True)
    # 这个策略同样要求在创建 QApplication 前设置
    try:
        QApplication.setHighDpiScaleFactorRoundingPolicy(
            Qt.HighDpiScaleFactorRoundingPolicy.PassThrough
        )
    except Exception:
        pass
    app = QApplication(sys.argv)
    app.setQuitOnLastWindowClosed(False)

    init_db()
    theme.load()          # 从数据库读取上次主题
    _set_autostart(True)

    panel = PanelWindow()
    ball = FloatBall()

    panel._ball_ref = ball

    ball.clicked.connect(lambda: panel.show_near(ball.pos(), BALL_SIZE))
    ball.right_clicked.connect(lambda pos: panel.tray.contextMenu().exec(pos))

    # 判断是否有保存的位置：有则直接在原位显示，没有则用悬浮球旁边
    has_saved = bool(database.get_setting("panel_x", ""))
    if has_saved:
        # _restore_geometry 已在 PanelWindow.__init__ 里执行，直接 show
        panel.setWindowOpacity(0)
        panel.show()
        panel.raise_()
        if hasattr(panel, "_ball_ref"):
            panel._ball_ref.hide()
        # 淡入
        from PyQt6.QtCore import QPropertyAnimation
        anim = QPropertyAnimation(panel, b"windowOpacity")
        anim.setDuration(180)
        anim.setStartValue(0.0)
        anim.setEndValue(1.0)
        anim.start()
        panel._anim = anim
    else:
        ball._place_default()
        panel.show_near(ball.pos(), BALL_SIZE)

    sys.exit(app.exec())


if __name__ == "__main__":
    main()