using System.Reactive;
using Avalonia.Media;
using Avalonia.Threading;
using DispenserCommon.Aop;
using DispenserCommon.Enums;
using DispenserCommon.Events;
using DispenserCommon.Exceptions;
using DispenserCommon.Ioc;
using DispenserHal.Camera.Factory;
using DispenserUI.Exceptions;
using DispenserUI.ViewModels.DTO;
using DispenserUI.Views.Common;
using DispenserUI.Views.Windows;
using ReactiveUI;

namespace DispenserUI.ViewModels.Common;

/// <summary>
///     系统变量
/// </summary>
[Component, GlobalTry]
public class SystemStatusVM : ViewModelBase
{
    private static readonly string[] MotionStatus = ["作业中", "待机中", "故障"];

    private static readonly IBrush[] LightColors =
    [
        new SolidColorBrush(Color.Parse("#31D05E")), new SolidColorBrush(Colors.DodgerBlue),
        new SolidColorBrush(Colors.Red)
    ];

    private static readonly BoxShadows[] LightShadows =
    [
        BoxShadows.Parse("0 0 20 5 LightGreen"),
        BoxShadows.Parse("0 0 20 5 DodgerBlue"),
        BoxShadows.Parse("0 0 20 5 IndianRed")
    ];

    private SystemStatusView View { get; set; }

    private SystemStatus _camera = new("视觉相机");

    private string _lightState = MotionStatus[1];

    private IBrush _lightColor = LightColors[1];

    private BoxShadows _lightShadow = LightShadows[1];

    private EmergencyWindow? _emergencyWindow;

    private CameraViewerWindow? _cameraViewerWindow;

    private int _lastErrorId;

    public void BindView(SystemStatusView view)
    {
        View = view;
    }


    public SystemStatus Camera
    {
        get => _camera;
        set => this.RaiseAndSetIfChanged(ref _camera, value);
    }

    public string LightState
    {
        get => _lightState;
        set => this.RaiseAndSetIfChanged(ref _lightState, value);
    }

    public IBrush LightColor
    {
        get => _lightColor;
        set => this.RaiseAndSetIfChanged(ref _lightColor, value);
    }

    public BoxShadows LightShadow
    {
        get => _lightShadow;
        set => this.RaiseAndSetIfChanged(ref _lightShadow, value);
    }

    public SystemStatusVM()
    {
        ToCameraViewer = ReactiveCommand.Create(OpenCameraViewer);
        EventBus<BizException>.AddEventHandler(EventType.Exception, ExceptionHandler);
    }

    /// <summary>
    /// 处理接收到的异常信息
    /// </summary>
    /// <param name="eventType"></param>
    /// <param name="exception"></param>
    private void ExceptionHandler(EventType eventType, BizException exception)
    {
        switch (exception)
        {
            case CameraException when exception.Level == ExceptionLevel.ERROR:
                CameraFault();
                break;
        }

        // 只记录告警以上级别的异常
        if (exception.Level <= ExceptionLevel.NORMAL) return;
    }


    public ReactiveCommand<Unit, Unit> ToDisableAll { get; }

    public ReactiveCommand<Unit, Unit> ToCameraViewer { get; }


    public ReactiveCommand<Unit, Unit> ToTest { get; }

    [Operation("开启相机预览")]
    private void OpenCameraViewer()
    {
        if (CameraManager.GetCamera() == null) return;
        if (_cameraViewerWindow == null)
        {
            _cameraViewerWindow = new CameraViewerWindow();
            _cameraViewerWindow.Show();
            _cameraViewerWindow.Closed += (_, _) => { _cameraViewerWindow = null; };
        }
        else
        {
            _cameraViewerWindow.Activate();
        }
    }

    private void CameraFault()
    {
        Camera.Background = "#EAD2D7";
        Camera.IsNormal = false;
        Camera.Tip = "连接异常";
    }

    private void CameraNormal()
    {
        Camera.Background = "Transparent";
        Camera.IsNormal = true;
    }


    /// <summary>
    /// 更新状态UI
    /// </summary>
    private void UpdateStateView(bool normal)
    {
        if (View == null) return;

        Dispatcher.UIThread.InvokeAsync(() =>
        {
            if (!normal) return;
            CameraNormal();
        });
    }


    /// <summary>
    /// 待机状态
    /// </summary>
    private void NormalState()
    {
        LightState = MotionStatus[1];
        LightColor = LightColors[1];
        LightShadow = LightShadows[1];
    }

    /// <summary>
    /// 作业中
    /// </summary>
    private void WorkingState()
    {
        LightState = MotionStatus[0];
        LightColor = LightColors[0];
        LightShadow = LightShadows[0];
    }

    /// <summary>
    /// 故障中
    /// </summary>
    private void FaultState()
    {
        LightState = MotionStatus[2];
        LightColor = LightColors[2];
        LightShadow = LightShadows[2];
    }
}