namespace SHH.CameraSdk.HikFeatures;

public class HikPtzProvider : IPtzFeature
{
    private readonly IHikContext _context;

    public HikPtzProvider(IHikContext context)
    {
        _context = context;
    }

    public async Task PtzControlAsync(PtzAction action, bool stop, int speed)
    {
        int userId = _context.GetUserId();
        if (userId < 0) throw new InvalidOperationException("设备离线");

        // 1. 映射指令
        uint hikCommand = action switch
        {
            PtzAction.Up => HikNativeMethods.TILT_UP,
            PtzAction.Down => HikNativeMethods.TILT_DOWN,
            PtzAction.Left => HikNativeMethods.PAN_LEFT,
            PtzAction.Right => HikNativeMethods.PAN_RIGHT,
            PtzAction.ZoomIn => HikNativeMethods.ZOOM_IN,
            PtzAction.ZoomOut => HikNativeMethods.ZOOM_OUT,
            PtzAction.FocusNear => HikNativeMethods.FOCUS_NEAR,
            PtzAction.FocusFar => HikNativeMethods.FOCUS_FAR,
            PtzAction.IrisOpen => HikNativeMethods.IRIS_OPEN,
            PtzAction.IrisClose => HikNativeMethods.IRIS_CLOSE,
            PtzAction.Wiper => HikNativeMethods.WIPER_PWRON,
            _ => 0
        };

        if (hikCommand == 0) return;

        // 2. 转换停止标志 (海康: 0=开始, 1=停止)
        uint dwStop = stop ? 1u : 0u;

        // 3. 限制速度范围 (1-7)
        uint dwSpeed = (uint)Math.Clamp(speed, 1, 7);

        // 4. 调用 SDK
        await Task.Run(() =>
        {
            // Channel 默认为 1
            bool result = HikNativeMethods.NET_DVR_PTZControlWithSpeed_Other(userId, 1, hikCommand, dwStop, dwSpeed);

            if (!result)
            {
                // 这里通常不抛异常，因为云台繁忙或到头是常态，记录日志即可
                // Console.WriteLine($"PTZ Error: {HikNativeMethods.NET_DVR_GetLastError()}");
            }
        });
    }

    public async Task PtzStepAsync(PtzAction action, int durationMs, int speed)
    {
        // 1. 开始转动 (调用已有的逻辑，stop=false)
        await PtzControlAsync(action, false, speed);

        // 2. 等待指定时间 (非阻塞等待)
        // 注意：这里使用 Task.Delay，精度对云台控制来说足够了
        if (durationMs > 0)
        {
            await Task.Delay(durationMs);
        }

        // 3. 停止转动 (调用已有的逻辑，stop=true)
        await PtzControlAsync(action, true, speed);
    }
}