using System;
using System.Collections.Generic;
using System.Linq;
using Jellyfin.Data.Enums;
using MediaBrowser.Controller.Drawing;
using MediaBrowser.Controller.Dto;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Persistence;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Querying;
using Microsoft.Extensions.Logging;

namespace Jellyfin.Drawing.Skia;

/// <summary>
/// The default image generator.
/// </summary>
public class DefaultImageGenerator : IImageGenerator
{
    private readonly IImageEncoder _imageEncoder;
    private readonly IItemRepository _itemRepository;
    private readonly ILogger _logger;

    /// <summary>
    /// Initializes a new instance of the <see cref="DefaultImageGenerator"/> class.
    /// </summary>
    /// <param name="imageEncoder">Instance of the <see cref="IImageEncoder"/> interface.</param>
    /// <param name="itemRepository">Instance of the <see cref="IItemRepository"/> interface.</param>
    /// <param name="logger">Instance of the <see cref="ILogger"/> interface.</param>
    public DefaultImageGenerator(
        IImageEncoder imageEncoder,
        IItemRepository itemRepository,
        ILogger<DefaultImageGenerator> logger)
    {
        _imageEncoder = imageEncoder;
        _itemRepository = itemRepository;
        _logger = logger;
    }

    /// <inheritdoc/>
    public IReadOnlyList<GeneratedImageType> GetSupportedImages()
    {
        return new[] { GeneratedImageType.Splashscreen };
    }

    /// <inheritdoc/>
    public void Generate(GeneratedImageType imageTypeType, string outputPath)
    {
        var posters = GetItemsWithImageType(ImageType.Primary).Select(x => x.GetImages(ImageType.Primary).First().Path).ToList();
        var landscape = GetItemsWithImageType(ImageType.Thumb).Select(x => x.GetImages(ImageType.Thumb).First().Path).ToList();
        if (landscape.Count == 0)
        {
            // Thumb images fit better because they include the title in the image but are not provided with TMDb.
            // Using backdrops as a fallback to generate an image at all
            _logger.LogDebug("No thumb images found. Using backdrops to generate splashscreen");
            landscape = GetItemsWithImageType(ImageType.Backdrop).Select(x => x.GetImages(ImageType.Backdrop).First().Path).ToList();
        }

        var splashBuilder = new SplashscreenBuilder((SkiaEncoder)_imageEncoder);
        splashBuilder.GenerateSplash(posters, landscape, outputPath);
    }

    private IReadOnlyList<BaseItem> GetItemsWithImageType(ImageType imageType)
    {
        // todo make included libraries configurable
        return _itemRepository.GetItemList(new InternalItemsQuery
        {
            CollapseBoxSetItems = false,
            Recursive = true,
            DtoOptions = new DtoOptions(false),
            ImageTypes = new[] { imageType },
            Limit = 30,
            // todo max parental rating configurable
            MaxParentalRating = 10,
            OrderBy = new ValueTuple<string, SortOrder>[]
            {
                new(ItemSortBy.Random, SortOrder.Ascending)
            },
            IncludeItemTypes = new[] { BaseItemKind.Movie, BaseItemKind.Series }
        });
    }
}