using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;

namespace Jellyfin.Plugin.AccurateRatings
{
    public class AccurateRatingsProvider : ICustomMetadataProvider<Episode>
    {
        /// <inheritdoc/>
        public string Name => "AccurateRatingsProvider";

        public Task<ItemUpdateType> FetchAsync(Episode item, MetadataRefreshOptions options, CancellationToken cancellationToken)
        {
            if (item.CommunityRating.HasValue)
            {
                decimal officialRating = (decimal)item.CommunityRating.Value;
                item.CommunityRating = (float)ConvertToAccurateRatings(officialRating);
            }

            return Task.FromResult<ItemUpdateType>(ItemUpdateType.MetadataImport);
        }

        public decimal ConvertToAccurateRatings(decimal imdbRating)
        {
            decimal rating = imdbRating;

            if (rating >= 5.0m && rating <= 9.4m)
            {
                return rating - 5.0m;
            }

            if (rating >= 9.5m)
            {
                return 5.0m;
            }

            return 0.0m;
        }
    }
}