using System.IO;
using System.Windows;

using CamBooth.App.Core.AppSettings;
using CamBooth.App.Core.Logging;
using CamBooth.App.Features.PictureGallery;

using EOSDigital.API;
using EOSDigital.SDK;

namespace CamBooth.App.Features.Camera;

public class CameraService : IDisposable
{
	private readonly AppSettingsService _appSettings;

	private readonly Logger _logger;

	private readonly PictureGalleryService _pictureGalleryService;

	private readonly CanonAPI APIHandler;

	private CameraValue[] AvList;

	private int BulbTime = 30;

	private List<EOSDigital.API.Camera> CamList;

	private int ErrCount;

	private object ErrLock = new();

	private bool IsInit;

	private CameraValue[] ISOList;

	public EOSDigital.API.Camera MainCamera;

	private CameraValue[] TvList;


	public CameraService(Logger logger, AppSettingsService appSettings, PictureGalleryService pictureGalleryService)
	{
		this._logger = logger;
		this._appSettings = appSettings;
		this._pictureGalleryService = pictureGalleryService;
		try
		{
			this.APIHandler = new CanonAPI();
			this.IsInit = true;
		}
		catch (DllNotFoundException)
		{
			this.ReportError("Canon DLLs not found!");
		}
		catch (Exception ex)
		{
			this.ReportError(ex.Message);
		}
	}


	/// <summary> Performs application-defined tasks associated with freeing, releasing, or resetting unmanaged resources. </summary>
	public void Dispose()
	{
		this.CloseSession();
		this.IsInit = false;
		this.APIHandler.Dispose();
		this.MainCamera.Dispose();
	}


	public void ConnectCamera()
	{
		ErrorHandler.SevereErrorHappened += this.ErrorHandler_SevereErrorHappened;
		ErrorHandler.NonSevereErrorHappened += this.ErrorHandler_NonSevereErrorHappened;

		this.RefreshCamera();
		List<EOSDigital.API.Camera> cameraList = this.APIHandler.GetCameraList();
		if (cameraList.Any())
		{
			this.OpenSession();
			this.SetSettingSaveToComputer();
			this.StarLiveView();
		}

		string cameraDeviceNames = string.Join(", ", cameraList.Select(cam => cam.DeviceName));
		this._logger.Info(cameraDeviceNames == string.Empty ? "No cameras / devices found" : cameraDeviceNames);
	}


	private void SetSettingSaveToComputer()
	{
		this.MainCamera.SetSetting(PropertyID.SaveTo, (int)SaveTo.Host);
		this.MainCamera.SetCapacity(4096, int.MaxValue);
	}


	public void CloseSession()
	{
		this.MainCamera.CloseSession();

		// AvCoBox.Items.Clear();
		// TvCoBox.Items.Clear();
		// ISOCoBox.Items.Clear();
		// SettingsGroupBox.IsEnabled = false;
		// LiveViewGroupBox.IsEnabled = false;
		// SessionButton.Content = "Open Session";
		// SessionLabel.Content = "No open session";
		// StarLVButton.Content = "Start LV";
	}


	private void RefreshCamera()
	{
		// CameraListBox.Items.Clear();
		this.CamList = this.APIHandler.GetCameraList();

		// foreach (Camera cam in CamList) CameraListBox.Items.Add(cam.DeviceName);
		// if (MainCamera?.SessionOpen == true) CameraListBox.SelectedIndex = CamList.FindIndex(t => t.ID == MainCamera.ID);
		// else if (CamList.Count > 0) CameraListBox.SelectedIndex = 0;
	}


	private void OpenSession()
	{
		this.MainCamera = this.CamList[0];
		this.MainCamera.OpenSession();

		//MainCamera.ProgressChanged += MainCamera_ProgressChanged;
		this.MainCamera.StateChanged += this.MainCamera_StateChanged;
		this.MainCamera.DownloadReady += this.MainCamera_DownloadReady;

		//SessionLabel.Content = MainCamera.DeviceName;
		this.AvList = this.MainCamera.GetSettingsList(PropertyID.Av);
		this.TvList = this.MainCamera.GetSettingsList(PropertyID.Tv);
		this.ISOList = this.MainCamera.GetSettingsList(PropertyID.ISO);

		// foreach (var Av in AvList) AvCoBox.Items.Add(Av.StringValue);
		// foreach (var Tv in TvList) TvCoBox.Items.Add(Tv.StringValue);
		// foreach (var ISO in ISOList) ISOCoBox.Items.Add(ISO.StringValue);
		// AvCoBox.SelectedIndex = AvCoBox.Items.IndexOf(AvValues.GetValue(MainCamera.GetInt32Setting(PropertyID.Av)).StringValue);
		// TvCoBox.SelectedIndex = TvCoBox.Items.IndexOf(TvValues.GetValue(MainCamera.GetInt32Setting(PropertyID.Tv)).StringValue);
		// ISOCoBox.SelectedIndex = ISOCoBox.Items.IndexOf(ISOValues.GetValue(MainCamera.GetInt32Setting(PropertyID.ISO)).StringValue);
		// SettingsGroupBox.IsEnabled = true;
		// LiveViewGroupBox.IsEnabled = true;
	}


	private void ReportError(string message)
	{
		this._logger.Info(message);
	}


	private void StarLiveView()
	{
		try
		{
			if (!this.MainCamera.IsLiveViewOn)
			{
				this.MainCamera.StartLiveView();
			}
			else
			{
				this.MainCamera.StopLiveView();

				//LVCanvas.Background = Brushes.LightGray;
			}
		}
		catch (Exception ex)
		{
			this.ReportError(ex.Message);
		}
	}


	public void TakePhoto()
	{
		try
		{
			this.MainCamera.TakePhoto();
		}
		catch (Exception ex)
		{
			this.ReportError(ex.Message);
			throw;
		}
	}


	#region API Events

	// private void APIHandler_CameraAdded(CanonAPI sender)
	// {
	// 	try
	// 	{
	// 	}
	// 	catch (Exception ex)
	// 	{
	// 		ReportError(ex.Message, false);
	// 	}
	// }


	private void MainCamera_StateChanged(EOSDigital.API.Camera sender, StateEventID eventID, int parameter)
	{
		try
		{
			if (eventID == StateEventID.Shutdown && this.IsInit)
			{
				Application.Current.Dispatcher.Invoke(() => this.CloseSession());

				//Dispatcher.Invoke((Action)delegate { CloseSession(); });
			}
		}
		catch (Exception ex)
		{
			this.ReportError(ex.Message);
		}
	}


	// private void MainCamera_ProgressChanged(object sender, int progress)
	// {
	// 	try
	// 	{
	// 		//MainProgressBar.Dispatcher.Invoke((Action)delegate { MainProgressBar.Value = progress; });
	// 	}
	// 	catch (Exception ex)
	// 	{
	// 		ReportError(ex.Message, false);
	// 	}
	// }

	// private void MainCamera_LiveViewUpdated(EOSDigital.API.Camera sender, Stream img)
	// {
	// 	try
	// 	{
	// 		using (WrapStream s = new WrapStream(img))
	// 		{
	// 			img.Position = 0;
	// 			BitmapImage EvfImage = new BitmapImage();
	// 			EvfImage.BeginInit();
	// 			EvfImage.StreamSource = s;
	// 			EvfImage.CacheOption = BitmapCacheOption.OnLoad;
	// 			EvfImage.EndInit();
	// 			EvfImage.Freeze();
	// 			Application.Current.Dispatcher.BeginInvoke(SetImageAction, EvfImage);
	// 		}
	// 	}
	// 	catch (Exception ex)
	// 	{
	// 		ReportError(ex.Message, false);
	// 	}
	// }


	private void MainCamera_DownloadReady(EOSDigital.API.Camera sender, DownloadInfo Info)
	{
		this._logger.Info("MainCamera_DownloadReady called");
		try
		{
			string dir = this._appSettings.PictureLocation;
			Info.FileName = $"img_{Guid.NewGuid().ToString()}.jpg";
			sender.DownloadFile(Info, dir);
			this._logger.Info("Download complete: " + Path.Combine(dir, Info.FileName));
			Application.Current.Dispatcher.Invoke(() => { this._pictureGalleryService.LoadThumbnailsToCache(); });
		}
		catch (Exception ex)
		{
			this.ReportError(ex.Message);
		}
	}


	private void ErrorHandler_NonSevereErrorHappened(object sender, ErrorCode ex)
	{
		this.ReportError($"SDK Error code: {ex} ({((int)ex).ToString("X")})");
	}


	private void ErrorHandler_SevereErrorHappened(object sender, Exception ex)
	{
		this.ReportError(ex.Message);
	}

	#endregion
}