using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Avalonia.Media.Imaging;
using Avalonia.Platform;
using Avalonia.Threading;
using CommunityToolkit.Mvvm.ComponentModel;
using FluentAvalonia.UI.Controls;
using StabilityMatrix.Core.Services;

namespace StabilityMatrix.Avalonia.ViewModels.Dialogs;

public partial class SelectModelVersionViewModel : ContentDialogViewModelBase
{
    private readonly ISettingsManager settingsManager;
    private readonly IDownloadService downloadService;

    public required ContentDialog Dialog { get; set; }
    public required IReadOnlyList<ModelVersionViewModel> Versions { get; set; }

    [ObservableProperty] private Bitmap? previewImage;
    [ObservableProperty] private ModelVersionViewModel? selectedVersionViewModel;
    [ObservableProperty] private CivitFileViewModel? selectedFile;
    [ObservableProperty] private bool isImportEnabled;

    public SelectModelVersionViewModel(ISettingsManager settingsManager,
        IDownloadService downloadService)
    {
        this.settingsManager = settingsManager;
        this.downloadService = downloadService;
    }

    public override void OnLoaded()
    {
        SelectedVersionViewModel = Versions[0];
    }

    partial void OnSelectedVersionViewModelChanged(ModelVersionViewModel? value)
    {
        var nsfwEnabled = settingsManager.Settings.ModelBrowserNsfwEnabled;
        var firstImageUrl = value?.ModelVersion?.Images?.FirstOrDefault(
            img => nsfwEnabled || img.Nsfw == "None")?.Url;

        Dispatcher.UIThread.InvokeAsync(async
            () => await UpdateImage(firstImageUrl));
    }

    partial void OnSelectedFileChanged(CivitFileViewModel? value)
    {
        IsImportEnabled = value?.CivitFile != null;
    }

    private async Task UpdateImage(string? url = null)
    {
        var assetStream = string.IsNullOrWhiteSpace(url)
            ? AssetLoader.Open(new Uri("avares://StabilityMatrix.Avalonia/Assets/noimage.png"))
            : await downloadService.GetImageStreamFromUrl(url);

        PreviewImage = new Bitmap(assetStream);
    }

    public void Cancel()
    {
        Dialog.Hide(ContentDialogResult.Secondary);
    }

    public void Import()
    {
        Dialog.Hide(ContentDialogResult.Primary);
    }
}