using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Drawing;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media.Imaging;
using TeamAAS.Camera;
using TeamAAS.Camera.Images;
using TeamAAS.Camera.Interfaces;
using TeamAAS.Camera.Models;
using TeamAAS.Camera.UI;
using TeamAAS.Views;
using System.Linq;

namespace TeamAAS.ViewModels
{
    /// <summary>设置页 - 相机管理（属性 + 操作）</summary>
    public partial class SettingViewModel
    {
        #region 相机管理

        public ObservableCollection<CameraInfo> Cameras { get; }
        public ObservableCollection<SdkStatusItem> SdkStatus { get; }

        private CameraInfo _selectedCamera;
        public CameraInfo SelectedCamera
        {
            get { return _selectedCamera; }
            set
            {
                if (SetProperty(ref _selectedCamera, value))
                    RefreshDebugHost();
                RaisePropertyChanged(nameof(HasSelectedCamera));
            }
        }

        public bool HasSelectedCamera => _selectedCamera != null;

        private ICamera _selectedCameraDevice;
        /// <summary>选中相机的运行时实例——内联属性编辑器直接编辑它（修改即实时下发硬件），不再走双击弹窗</summary>
        public ICamera SelectedCameraDevice
        {
            get { return _selectedCameraDevice; }
            private set { SetProperty(ref _selectedCameraDevice, value); }
        }

        /// <summary>当前正在采集的相机实例——设置页同一时间只允许一路预览，防止多路画面串页</summary>
        private ICamera _grabbingCamera;

        private object _currentDebugPage;
        /// <summary>右侧调试页容器的内容：按 [Camera] 特性加载品牌专属页，未指定则用默认页</summary>
        public object CurrentDebugPage
        {
            get { return _currentDebugPage; }
            private set { SetProperty(ref _currentDebugPage, value); }
        }

        /// <summary>按选中的相机刷新右侧调试页与属性编辑器的绑定目标</summary>
        private void RefreshDebugHost()
        {
            // 旧页面解绑
            (_currentDebugPage as ICameraDebugPage)?.UnbindCamera();
            CurrentDebugPage = null;
            SelectedCameraDevice = null;

            if (_selectedCamera == null)
            {
                StopGrabbingInternal(_grabbingCamera);
                return;
            }

            var device = _cameraManager.GetCamera(_selectedCamera.Id);
            if (device == null)
            {
                StopGrabbingInternal(_grabbingCamera);
                return;
            }

            SelectedCameraDevice = device;

            // 切到另一台相机时停掉上一路采集，避免旧相机画面串进新调试页
            if (_grabbingCamera != null && !ReferenceEquals(_grabbingCamera, device))
                StopGrabbingInternal(_grabbingCamera);

            try
            {
                CurrentDebugPage = CameraDebugPageFactory.Create(device);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"加载调试页失败: {ex.Message}");
            }
        }

        private BitmapSource _currentImage;
        public BitmapSource CurrentImage
        {
            get { return _currentImage; }
            set { SetProperty(ref _currentImage, value); }
        }

        private string _fpsText = "";
        public string FpsText
        {
            get { return _fpsText; }
            set { SetProperty(ref _fpsText, value); }
        }

        #endregion

        #region 相机操作

        private void LoadSdkStatus()
        {
            SdkStatus.Clear();
            try
            {
                var statusList = CameraManager.Instance.GetSdkStatus();
                foreach (var (Name, Installed, Version) in statusList)
                {
                    SdkStatus.Add(new SdkStatusItem { Name = Name, Installed = Installed, Version = Version });
                }
            }
            catch { }
        }

        private void OpenSearchDialog()
        {
            var dialog = new SearchDeviceWindow
            {
                Owner = Application.Current.MainWindow
            };

            if (dialog.ShowDialog() == true)
            {
                foreach (var info in dialog.SelectedDevices)
                {
                    try
                    {
                        if (_cameraManager.ContainsSN(info.SerialNumber))
                        {
                            DialogHelper.ShowWarning($"相机 {info.CameraName} 已存在");
                            continue;
                        }

                        _cameraManager.CreateCamera(info.Id, info);
                        info.CameraNo = Cameras.Count + 1;
                        Cameras.Add(info);
                    }
                    catch (Exception ex)
                    {
                        DialogHelper.ShowError("添加相机失败", ex);
                    }
                }
            }
        }

        private void DeleteCamera()
        {
            if (SelectedCamera == null) return;

            if (!DialogHelper.ConfirmYesNo(
                $"确认删除相机 \"{SelectedCamera.CameraName}\" 吗?",
                "确认删除"))
            {
                return;
            }

            var cameraToRemove = SelectedCamera;
            var id = cameraToRemove.Id;

            // 删除前先停掉该相机的采集与预览（退订帧事件），避免残留订阅推鬼帧
            if (_grabbingCamera != null && _grabbingCamera.ID == id)
                StopGrabbingInternal(_grabbingCamera);

            try
            {
                _cameraManager.RemoveCamera(id);
            }
            catch (Exception ex)
            {
                System.Diagnostics.Debug.WriteLine($"释放相机资源异常: {ex.Message}");
            }

            Cameras.Remove(cameraToRemove);

            for (int i = 0; i < Cameras.Count; i++)
            {
                Cameras[i].CameraNo = i + 1;
            }

            SelectedCamera = null;
        }

        private async System.Threading.Tasks.Task ConnectAsync()
        {
            if (SelectedCamera == null) return;

            try
            {
                var camera = _cameraManager.GetCamera(SelectedCamera.Id);
                if (camera == null)
                {
                    DialogHelper.ShowWarning("未找到相机实例，请先添加");
                    return;
                }

                bool success = await camera.OpenDeviceAsync();
                SelectedCamera.IsConnected = success;

                if (!success)
                {
                    DialogHelper.ShowError($"相机连接失败: {camera.ErrorMessage}");
                }
            }
            catch (Exception ex)
            {
                DialogHelper.ShowError("连接失败", ex);
            }
        }

        private void Disconnect()
        {
            if (SelectedCamera == null) return;

            try
            {
                var camera = _cameraManager.GetCamera(SelectedCamera.Id);
                if (camera == null) return;

                if (camera.IsGrabbing)
                {
                    camera.StopGrabbing();
                    camera.ImageCallbackEvent -= OnImageCallback;
                    SelectedCamera.IsGrabbing = false;
                }

                camera.CloseDevice();
                SelectedCamera.IsConnected = false;
                CurrentImage = null;
                FpsText = "";
                if (CurrentDebugPage is ICameraImageSink sinkClear)
                    sinkClear.ShowImage(null);
            }
            catch (Exception ex)
            {
                DialogHelper.ShowError("断开失败", ex);
            }
        }

        private void StartGrabbing()
        {
            if (SelectedCamera == null) return;

            try
            {
                var camera = _cameraManager.GetCamera(SelectedCamera.Id);
                if (camera == null) return;

                // 同一时间只允许一路预览：采集另一台相机前先停掉当前这一路，
                // 否则旧相机的帧订阅仍在，两路画面会交替串进同一个调试页
                if (_grabbingCamera != null && !ReferenceEquals(_grabbingCamera, camera))
                    StopGrabbingInternal(_grabbingCamera);

                if (!camera.IsConnected)
                {
                    camera.OpenDevice();
                    SelectedCamera.IsConnected = camera.IsConnected;
                }

                camera.ImageCallbackEvent += OnImageCallback;
                camera.StartGrabbing();
                SelectedCamera.IsGrabbing = true;
                _grabbingCamera = camera;
            }
            catch (Exception ex)
            {
                DialogHelper.ShowError("开始采集失败", ex);
            }
        }

        private void StopGrabbing()
        {
            var camera = _cameraManager.GetCamera(SelectedCamera?.Id ?? Guid.Empty);
            StopGrabbingInternal(camera ?? _grabbingCamera);
        }

        /// <summary>停掉指定相机的采集并退订帧事件（按 Id 同步列表行的采集状态标记）</summary>
        private void StopGrabbingInternal(ICamera camera)
        {
            if (camera == null) return;

            try
            {
                camera.StopGrabbing();
                camera.ImageCallbackEvent -= OnImageCallback;

                var info = Cameras?.FirstOrDefault(c => c.Id == camera.ID);
                if (info != null)
                {
                    info.IsGrabbing = false;
                    info.IsConnected = camera.IsConnected;
                }

                if (info != null && ReferenceEquals(SelectedCamera, info))
                {
                    SelectedCamera.IsGrabbing = false;
                    CurrentImage = null;
                    FpsText = "";
                }
            }
            catch (Exception ex)
            {
                DialogHelper.ShowError("停止采集失败", ex);
            }
            finally
            {
                if (ReferenceEquals(_grabbingCamera, camera))
                    _grabbingCamera = null;
            }
        }

        private void OnImageCallback(GenImage image, TimeSpan elapsed, string info)
        {
            if (image == null) return;
            try
            {
                var bitmap = image.ToBitmap();
                var hBitmap = bitmap.GetHbitmap();
                var bmpSource = Imaging.CreateBitmapSourceFromHBitmap(
                    hBitmap, IntPtr.Zero, Int32Rect.Empty,
                    BitmapSizeOptions.FromEmptyOptions());
                DeleteObject(hBitmap);
                bitmap.Dispose();
                bmpSource.Freeze();

                Application.Current?.Dispatcher?.BeginInvoke(new Action(() =>
                {
                    CurrentImage = bmpSource;
                    FpsText = elapsed.TotalMilliseconds > 0
                        ? $"{1000.0 / elapsed.TotalMilliseconds:F1} fps"
                        : "";

                    // 把画面推送给当前调试页（若其具备图像接收能力）
                    if (CurrentDebugPage is ICameraImageSink sink)
                        sink.ShowImage(bmpSource);
                }));
            }
            catch { }
        }

        #endregion

        #region 相机列表刷新 & 配置保存

        private void RefreshCameraList()
        {
            var selectedId = SelectedCamera?.Id ?? Guid.Empty;

            Cameras.Clear();
            var infos = _cameraManager.GetAllCameraInfos();
            foreach (var info in infos)
            {
                Cameras.Add(info);
            }

            // 保持原选中项（重建调试页容器与属性编辑器绑定）
            if (selectedId != Guid.Empty)
            {
                var match = Cameras.FirstOrDefault(c => c.Id == selectedId);
                if (match != null && !ReferenceEquals(match, SelectedCamera))
                    SelectedCamera = match;
            }
        }

        private void SaveCameraConfig()
        {
            try
            {
                if (_cameraManager.SaveConfig())
                {
                    RefreshCameraList();
                    DialogHelper.Success("相机配置已保存");
                }
                else
                    DialogHelper.ShowError("相机配置保存失败，请查看日志");
            }
            catch (Exception ex)
            {
                DialogHelper.ShowError("保存相机配置失败", ex);
            }
        }

        #endregion
    }
}