using System.IO;
using System.Windows.Input;
using Azaion.Common.DTO;
using Azaion.Common.DTO.Config;
using MediatR;
using Microsoft.Extensions.Options;

namespace Azaion.Dataset;

public class DatasetExplorerEventHandler(DatasetExplorer datasetExplorer, IGalleryManager galleryManager, IOptions<DirectoriesConfig> directoriesConfig)
    :
        INotificationHandler<KeyEvent>,
        INotificationHandler<ImageCreatedEvent>
{
    private readonly Dictionary<Key, PlaybackControlEnum> _keysControlEnumDict = new()
    {
        { Key.Enter, PlaybackControlEnum.SaveAnnotations },
        { Key.Delete, PlaybackControlEnum.RemoveSelectedAnns },
        { Key.X, PlaybackControlEnum.RemoveAllAnns },
        { Key.Escape, PlaybackControlEnum.Close }
    };

    public async Task Handle(KeyEvent keyEvent, CancellationToken cancellationToken)
    {
        if (keyEvent.WindowEnum != WindowEnum.DatasetExplorer)
            return;

        var key = keyEvent.Args.Key;
        var keyNumber = (int?)null;

        if ((int)key >= (int)Key.D1 && (int)key <= (int)Key.D9) keyNumber = key - Key.D1;
        if ((int)key >= (int)Key.NumPad1 && (int)key <= (int)Key.NumPad9) keyNumber = key - Key.NumPad1;

        if (keyNumber.HasValue)
            datasetExplorer.LvClasses.SelectedIndex = keyNumber.Value;
        else
        {
            if (datasetExplorer.Switcher.SelectedIndex == 1 && _keysControlEnumDict.TryGetValue(key, out var value))
                await HandleControl(value);
        }
    }

    private async Task HandleControl(PlaybackControlEnum controlEnum)
    {
        switch (controlEnum)
        {
            case PlaybackControlEnum.SaveAnnotations:
                if (datasetExplorer.ThumbnailLoading)
                    return;

                var currentAnns = datasetExplorer.ExplorerEditor.CurrentAnns
                    .Select(x => new YoloLabel(x.Info, datasetExplorer.ExplorerEditor.RenderSize, datasetExplorer.ExplorerEditor.RenderSize))
                    .ToList();

                await YoloLabel.WriteToFile(currentAnns, Path.Combine(directoriesConfig.Value.LabelsDirectory, datasetExplorer.CurrentThumbnail!.LabelPath));
                await galleryManager.CreateThumbnail(datasetExplorer.CurrentThumbnail.ImagePath);
                await galleryManager.SaveLabelsCache();
                datasetExplorer.CurrentThumbnail.UpdateImage();
                datasetExplorer.SwitchTab(toEditor: false);
                break;
            case PlaybackControlEnum.RemoveSelectedAnns:
                datasetExplorer.ExplorerEditor.RemoveSelectedAnns();
                break;
            case PlaybackControlEnum.RemoveAllAnns:
                datasetExplorer.ExplorerEditor.RemoveAllAnns();
                break;
            case PlaybackControlEnum.Close:
                datasetExplorer.SwitchTab(toEditor: false);
                break;
        }
    }

     public async Task Handle(ImageCreatedEvent imageCreatedEvent, CancellationToken cancellationToken)
    {
        var (thumbnailDto, detections) = await galleryManager.CreateThumbnail(imageCreatedEvent.ImagePath, cancellationToken);
        if (thumbnailDto != null && detections != null)
            datasetExplorer.AddThumbnail(thumbnailDto, detections);
    }
}