using Jellyfin.Plugin.NewReleases.Models;
using Jellyfin.Data.Enums;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Library;

namespace Jellyfin.Plugin.NewReleases.Services;

public sealed class NewReleasesService
{
    private const int DefaultMaxItems = 20;
    private const int DefaultReleaseWindowDays = 365;

    private readonly ILibraryManager _libraryManager;

    public NewReleasesService(ILibraryManager libraryManager)
    {
        _libraryManager = libraryManager;
    }

    public NewReleasesResponse GetNewlyReleasedMovies()
    {
        var configuration = Plugin.Instance?.Configuration ?? new PluginConfiguration();
        var maxItems = configuration.MaxItems > 0 ? configuration.MaxItems : DefaultMaxItems;
        var releaseWindowDays = configuration.ReleaseWindowDays > 0 ? configuration.ReleaseWindowDays : DefaultReleaseWindowDays;
        var cutoffUtc = DateTime.UtcNow.AddDays(-releaseWindowDays);

        var query = new InternalItemsQuery
        {
            IncludeItemTypes = [BaseItemKind.Movie],
            Recursive = true
        };

        var items = _libraryManager.GetItemList(query)
            .Where(x => x.PremiereDate.HasValue)
            .Where(x => x.PremiereDate!.Value.ToUniversalTime() >= cutoffUtc)
            .OrderByDescending(x => x.PremiereDate!.Value)
            .Take(maxItems)
            .Select(x => new NewReleaseMovieDto
            {
                Id = x.Id.ToString("N"),
                Name = x.Name,
                PremiereDate = x.PremiereDate!.Value.ToUniversalTime()
            })
            .ToList();

        return new NewReleasesResponse
        {
            TotalRecordCount = items.Count,
            Items = items
        };
    }
}