using MainShell.Common;
using MainShell.Hardware;
using MainShell.Models;
using MwFramework.Controls.ControlCanvas;
using Stylet;
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Reflection;
using System.Windows.Input;

namespace MainShell.Common.ViewModel
{
    /// <summary>
    /// 单个光源通道的包装类
    /// </summary>
    public class LightChannelViewModel : PropertyChangedBase
    {
        private readonly object _sourceConfig;
        private readonly PropertyInfo _propertyInfo;

        public string Name { get; set; }

        public int Value
        {
            get => (int)_propertyInfo.GetValue(_sourceConfig);
            set
            {
                if (value != Value)
                {
                    _propertyInfo.SetValue(_sourceConfig, value);
                    NotifyOfPropertyChange();
                }
            }
        }

        public LightChannelViewModel(object sourceConfig, PropertyInfo propertyInfo, string displayName)
        {
            _sourceConfig = sourceConfig;
            _propertyInfo = propertyInfo;
            Name = displayName;
        }
    }

    /// <summary>
    /// 相机及光源参数设置弹窗 ViewModel
    /// </summary>
    public class CameraSettingsViewModel : Screen
    {
        private readonly IWindowManager _windowManager;
        private readonly HardwareManager _hardwareManager;
        
        // 核心标志位：是否正在从硬件同步数据
        private bool _isSyncingFromHardware; 

        private CameraType _currentCameraType;
        private object _currentLightConfig;

        private CameraConfig _cameraConfig;
        public CameraConfig CameraConfig
        {
            get => _cameraConfig;
            set => SetAndNotify(ref _cameraConfig, value);
        }

        private ObservableCollection<LightChannelViewModel> _lightChannels;
        public ObservableCollection<LightChannelViewModel> LightChannels
        {
            get => _lightChannels;
            set => SetAndNotify(ref _lightChannels, value);
        }

        public ICommand ReadFromHardwareCommand { get; }
        public ICommand SaveAndCloseCommand { get; }

        public CameraSettingsViewModel(IWindowManager windowManager, HardwareManager hardwareManager)
        {
            _windowManager = windowManager;
            _hardwareManager = hardwareManager;
            
            ReadFromHardwareCommand = new DelegateCommand(ReadFromHardware);
            SaveAndCloseCommand = new DelegateCommand(SaveAndClose);
            DisplayName = "相机光源参数设置";
        }

        /// <summary>
        /// 初始化并绑定数据
        /// </summary>
        public void Initialize(CameraConfig cameraConfig, object lightConfig, CameraType cameraType)
        {
            // 1. 解绑旧对象的事件（如果有）
            if (CameraConfig != null) CameraConfig.PropertyChanged -= OnConfigPropertyChanged;
            if (_currentLightConfig is INotifyPropertyChanged oldLight) oldLight.PropertyChanged -= OnConfigPropertyChanged;

            _currentCameraType = cameraType;
            CameraConfig = cameraConfig;
            _currentLightConfig = lightConfig;

            // 2. 重新订阅事件
            if (CameraConfig != null) CameraConfig.PropertyChanged += OnConfigPropertyChanged;
            if (_currentLightConfig is INotifyPropertyChanged newLight) newLight.PropertyChanged += OnConfigPropertyChanged;

            // 3. 生成光源通道列表
            LightChannels = new ObservableCollection<LightChannelViewModel>();
            if (lightConfig != null)
            {
                var properties = lightConfig.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance);
                foreach (var prop in properties)
                {
                    if (prop.PropertyType == typeof(int) && prop.CanRead && prop.CanWrite)
                    {
                        var descAttr = prop.GetCustomAttribute<DescriptionAttribute>();
                        // 必须有 Description 才认为是光源通道
                        if (descAttr != null)
                        {
                            var vm = new LightChannelViewModel(lightConfig, prop, descAttr.Description);
                            LightChannels.Add(vm);
                        }
                    }
                }
            }
        }

        /// <summary>
        /// 统一处理属性变更事件 => 设置硬件
        /// </summary>
        private void OnConfigPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            // 关键逻辑：如果是从硬件读取过程中，则忽略，不要反向设置回去
            if (_isSyncingFromHardware) return;

            ApplySettingToHardware(sender, e.PropertyName);
        }

        private void ApplySettingToHardware(object source, string propertyName)
        {
            // 1. 设置相机参数
            if (source == CameraConfig)
            {
                // TODO: 替换为实际的 set 相机参数代码
                /*
                var camDevice = _hardwareManager.GetCamera(_currentCameraType);
                if (propertyName == nameof(CameraConfig.ExposureTime))
                {
                    camDevice.SetExposure(CameraConfig.ExposureTime);
                }
                else if (propertyName == nameof(CameraConfig.Gain))
                {
                    camDevice.SetGain(CameraConfig.Gain);
                }
                */
                System.Diagnostics.Debug.WriteLine($"[Hardware Set] Cam: {_currentCameraType}, Prop: {propertyName}");
                return;
            }

            // 2. 设置光源参数 (根据类型直接判断)
            if (source is MapCamLightConfig mapConfig)
            {
                if (propertyName == nameof(MapCamLightConfig.RedLight))
                {
                    // TODO: _hardwareManager.SetMapRedLight(mapConfig.RedLight);
                    System.Diagnostics.Debug.WriteLine($"[Hardware Set] MapCam Red: {mapConfig.RedLight}");
                }
                else if (propertyName == nameof(MapCamLightConfig.BlueLight))
                {
                    // TODO: _hardwareManager.SetMapBlueLight(mapConfig.BlueLight);
                     System.Diagnostics.Debug.WriteLine($"[Hardware Set] MapCam Blue: {mapConfig.BlueLight}");
                }
            }
            else if (source is UpCamLightConfig upConfig)
            {
                if (propertyName == nameof(UpCamLightConfig.PointRedLight))
                {
                    // TODO: _hardwareManager.SetUpPointRed(upConfig.PointRedLight);
                     System.Diagnostics.Debug.WriteLine($"[Hardware Set] UpCam PointRed: {upConfig.PointRedLight}");
                }
                else if (propertyName == nameof(UpCamLightConfig.RingRedLight))
                {
                    // TODO: ...
                }
                // ... 处理其他 UpCam 通道
            }
            else if (source is DownCamLightConfig downConfig)
            {
                if (propertyName == nameof(DownCamLightConfig.PointRedLight))
                {
                     // TODO: ...
                }
                // ... 处理其他 DownCam 通道
            }
        }

        /// <summary>
        /// 从硬件读取当前值 => 更新 UI (不触发设置)
        /// </summary>
        private void ReadFromHardware()
        {
            try
            {
                _isSyncingFromHardware = true; // 开启静默模式

                // 1. 读取相机实际参数
                /*
                var camDevice = _hardwareManager.GetCamera(_currentCameraType);
                if (camDevice != null) {
                    CameraConfig.ExposureTime = (int)camDevice.CurrentExposure;
                    CameraConfig.Gain = (int)camDevice.CurrentGain;
                }
                */

                // 2. 读取光源实际参数
                if (_currentLightConfig is MapCamLightConfig mapConfig)
                {
                    // TODO: 读取实际硬件值
                    mapConfig.RedLight = _hardwareManager.GetMapRedLightIntensity();
                    mapConfig.BlueLight = _hardwareManager.GetMapBlueLightIntensity();
                }
                else if (_currentLightConfig is UpCamLightConfig upConfig)
                {
                    upConfig.PointRedLight = _hardwareManager.GetUpPointRedLightIntensity();
                    upConfig.PointBlueLight=_hardwareManager.GetUpPointBlueLightIntensity();
                    upConfig.RingRedLight=_hardwareManager.GetUpRingRedLightIntensity();
                    upConfig.RingBlueLight=_hardwareManager.GetUpRingBlueLightIntensity();
                    upConfig.RedBackLight=_hardwareManager.GetUpRedBackLightIntensity();
                    // ...
                }
                else if (_currentLightConfig is DownCamLightConfig downConfig)
                {
                    // downConfig.PointRedLight = ...
                    downConfig.PointRedLight = _hardwareManager.GetDownPointRedLightIntensity();
                    downConfig.PointBlueLight = _hardwareManager.GetDownPointBlueLightIntensity();
                    downConfig.RingRedLight = _hardwareManager.GetDownRingRedLightIntensity();
                    downConfig.RingBlueLight = _hardwareManager.GetDownRingBlueLightIntensity();
                    // ...
                }

            }
            finally
            {
                foreach (var channel in LightChannels)
                {
                    // 强制刷新 UI
                    channel.Refresh();
                }
                _isSyncingFromHardware = false; // 必须复位
            }
        }

        private void SaveAndClose()
        {
            RequestClose(true);
        }
    }
}