using System.Collections.Concurrent;
using System.Collections.ObjectModel;
using System.IO;
using System.Windows;
using System.Windows.Media.Imaging;
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Messaging;
using Livia.Models;
using Livia.Models.Data;
using Livia.Utility;
using Livia.Utility.DependencyInjection;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace Livia.ViewModels;

public class MosaicImageGroupControlViewModel : ObservableObject, IRecipient<RoiTabChangedMessage>, ILiviaModuleViewModel
{
    public ObservableCollection<MosaicImageData> MosaicImageCollection { get; } = [];
    public ImageRotationViewerGroupControlViewModel AxialOverviewViewModel { get; }
    public bool AxialOverviewVisible
    {
        get => _axialOverviewVisibleVisible;
        set
        {
            SetProperty(ref _axialOverviewVisibleVisible, value);
            if (!value)
                return;
            RoiLegendVisible = true;
            ColorBarVisible = false;

            AdditionalInfoJson additionalInfo = _dataBlockLoader.GetSharedData<AdditionalInfoJson>("additionalInfo");
            string defaultMaskToLoad = additionalInfo.AtlasInfoListDict.Keys.First(k => k.Contains("cbf", StringComparison.CurrentCultureIgnoreCase));
            ImageRotationViewerControlViewModel.LoadAtlasName = defaultMaskToLoad;
            PerfusionDataGridControlViewModel.LoadAtlasName = defaultMaskToLoad;
            WeakReferenceMessenger.Default.Send(new MaskChangedMessage());
        }
    }
    public bool RoiLegendVisible { get => _roiLegendVisible; private set => SetProperty(ref _roiLegendVisible, value); }
    public bool ColorBarVisible { get => _colorBarVisible; private set => SetProperty(ref _colorBarVisible, value); }
    public ColorBarControlViewModel ColorBarControlViewModel { get; }
    public IRoiLegendManager RoiLegendManager { get; }
    public MosaicImageControlViewModel CurrentMosaicImageControlViewModel { get; }
    public static bool RoiEnabled { get; set; } = true;
    public int LastTabIndex;

    private bool _axialOverviewVisibleVisible;
    private bool _roiLegendVisible;
    private bool _colorBarVisible;
    private string _currentMosaicImageKey = string.Empty;
    private int _currentTabIndex;
    private readonly IDataBlockLoader _dataBlockLoader;
    private readonly ILogger _logger;
    private readonly Dictionary<(string MosaicImageKey, int TabIndex), ObservableCollection<RoiExpanderControlViewModel>> _roiCollectionDictionary = new();
    private readonly ObservableCollection<RoiExpanderControlViewModel> _emptyCollection = [];


    public MosaicImageGroupControlViewModel(IRoiLegendManager roiLegendManager, IDataBlockLoader dataBlockLoader, ILogger logger)
    {
        RoiLegendManager = roiLegendManager;
        _dataBlockLoader = dataBlockLoader;
        _logger = logger;
        AxialOverviewViewModel = ActivatorUtilities.CreateInstance<ImageRotationViewerGroupControlViewModel>(ServiceProviderFactory.ServiceProvider);

        ColorBarControlViewModel = ActivatorUtilities.CreateInstance<ColorBarControlViewModel>(ServiceProviderFactory.ServiceProvider);
        CurrentMosaicImageControlViewModel = ActivatorUtilities.CreateInstance<MosaicImageControlViewModel>(ServiceProviderFactory.ServiceProvider);

        WeakReferenceMessenger.Default.RegisterAll(this);
    }

    public async Task LoadData(DataBlock dataBlock)
    {
        MosaicImageCollection.Clear();
        AdditionalInfoJson additionalInfo = _dataBlockLoader.GetSharedData<AdditionalInfoJson>("additionalInfo");
        CurrentMosaicImageControlViewModel.RoiCollection = _emptyCollection;
        foreach (MosaicImageInfo info in additionalInfo.MosaicImageInfoList)
        {
            //roi disabled, and it is a roi image. 
            if (!RoiEnabled && info.Range == null)
                continue;

            string displayName = info.ImgId;

            BitmapImage image = await LiviaUtility.LoadBitmapAsync(Path.Combine(dataBlock.ResultPath, info.FilePath));
            MosaicImageData data = new(image, displayName, info)
            {
                ShowJumpToDataGridButton = additionalInfo.AtlasInfoListDict.ContainsKey(info.ImgId),
                ShowMosaicRoiOverlayTip = additionalInfo.MosaicRoiOverlayInfoList.Exists(n => n.ImgId.Equals(info.ImgId))
            };

            MosaicImageCollection.Add(data);
        }

        await AxialOverviewViewModel.LoadData(dataBlock);
        AxialOverviewVisible = true;

        //update roi collection
        _roiCollectionDictionary.Clear();
        if (RoiSummaryControlViewModel.RoiTabIdToTabIndexDictionary != null)
        {
            Dictionary<string, ConcurrentBag<RoiExpanderControlViewModel>> roiDictionary = _dataBlockLoader.GetSharedData<Dictionary<string, ConcurrentBag<RoiExpanderControlViewModel>>>("roiCollection");
            foreach (RoiOverlayInfo overlayInfo in additionalInfo.MosaicRoiOverlayInfoList)
            {
                ObservableCollection<RoiExpanderControlViewModel> roiCollection = [];
                if (roiDictionary.TryGetValue(overlayInfo.RoiTabId, out ConcurrentBag<RoiExpanderControlViewModel>? bag))
                    roiCollection.AddRange(bag.OrderBy(item => item.ZIndex));
                if (!RoiSummaryControlViewModel.RoiTabIdToTabIndexDictionary.TryGetValue(overlayInfo.RoiTabId, out int tabIndex))
                    continue;
                if (!_roiCollectionDictionary.TryAdd((overlayInfo.ImgId, tabIndex), roiCollection))
                {
                    _logger.LogWarning("Mosaic roi key pair already exists: {imageId}, {tabIndex}", overlayInfo.ImgId, tabIndex);
                }
            }
        }
    }

    public void Init()
    {
    }

    public void SetSelectedMosaicImage(MosaicImageData data)
    {
        ColorBarVisible = data.UseColorBar;
        RoiLegendVisible = !ColorBarVisible;
        AxialOverviewVisible = false;

        CurrentMosaicImageControlViewModel.CurrentMosaicImage = data.Image;
        _currentMosaicImageKey = data.MosaicImageInfo.ImgId;
        CurrentMosaicImageControlViewModel.RoiCollection = _emptyCollection;
        UpdateRoi();

        if (data.MosaicImageInfo.Range == null)
            return;

        ColorBarControlViewModel.ColorBarRangeMin = data.MosaicImageInfo.Range[0];
        ColorBarControlViewModel.ColorBarRangeMax = data.MosaicImageInfo.Range[1];
        ColorBarControlViewModel.ColorBarUnit = data.MosaicImageInfo.Unit;
        ColorBarControlViewModel.ImagePath = data.MosaicImageInfo.IsGray ? ColorBarControlViewModel.BlackWhiteColorBarImage : ColorBarControlViewModel.PerfusionColorBarImage;

        AdditionalInfoJson additionalInfo = _dataBlockLoader.GetSharedData<AdditionalInfoJson>("additionalInfo");
        string maskToLoad = additionalInfo.AtlasInfoListDict.ContainsKey(data.DisplayName) ? data.DisplayName : additionalInfo.AtlasInfoListDict.Keys.First(k => k.Contains("cbf", StringComparison.CurrentCultureIgnoreCase));
        ImageRotationViewerControlViewModel.LoadAtlasName = maskToLoad;
        WeakReferenceMessenger.Default.Send(new MaskChangedMessage());
        if (data.ShowJumpToDataGridButton)
            WeakReferenceMessenger.Default.Send(new PerfusionDataGridChangeParameterMessage(maskToLoad));
    }

    private void UpdateRoi()
    {
        if (_roiCollectionDictionary.TryGetValue((_currentMosaicImageKey, _currentTabIndex), out ObservableCollection<RoiExpanderControlViewModel>? roiCollection))
        {
            CurrentMosaicImageControlViewModel.RoiCollection = roiCollection;
            LastTabIndex = _currentTabIndex;
        }
        else
        {
            if (_roiCollectionDictionary.TryGetValue((_currentMosaicImageKey, LastTabIndex), out ObservableCollection<RoiExpanderControlViewModel>? lastRoiCollection))
                CurrentMosaicImageControlViewModel.RoiCollection = lastRoiCollection;
        }

        //update display name
        foreach (MosaicImageData mosaicImageData in MosaicImageCollection)
        {
            if (_roiCollectionDictionary.ContainsKey((mosaicImageData.MosaicImageInfo.ImgId, _currentTabIndex)))
            {
                mosaicImageData.DisplayName = (string)(Application.Current.TryFindResource($"RoiTabHeader{_currentTabIndex}") ?? "");
            }
        }
    }

    public void Receive(RoiTabChangedMessage message)
    {
        _currentTabIndex = message.Value;
        UpdateRoi();
    }
}