using MediaBrowser.Controller.Configuration;
using MediaBrowser.Controller.Entities;
using MediaBrowser.Controller.Entities.TV;
using MediaBrowser.Controller.Library;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Logging;
using System;
using System.Threading;
using System.Threading.Tasks;

namespace MediaBrowser.Providers.TV
{
    /// <summary>
    /// Making this a provider because of how slow it is
    /// It only ever needs to run once
    /// </summary>
    public class EpisodeIndexNumberProvider : BaseMetadataProvider
    {
        /// <summary>
        /// Initializes a new instance of the <see cref="BaseMetadataProvider" /> class.
        /// </summary>
        /// <param name="logManager">The log manager.</param>
        /// <param name="configurationManager">The configuration manager.</param>
        public EpisodeIndexNumberProvider(ILogManager logManager, IServerConfigurationManager configurationManager)
            : base(logManager, configurationManager)
        {
        }

        protected override bool RefreshOnVersionChange
        {
            get
            {
                return true;
            }
        }

        protected override string ProviderVersion
        {
            get
            {
                return "2";
            }
        }

        /// <summary>
        /// Supportses the specified item.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <returns><c>true</c> if XXXX, <c>false</c> otherwise</returns>
        public override bool Supports(BaseItem item)
        {
            return item is Episode && item.LocationType != LocationType.Virtual && item.LocationType != LocationType.Remote;
        }

        /// <summary>
        /// Fetches metadata and returns true or false indicating if any work that requires persistence was done
        /// </summary>
        /// <param name="item">The item.</param>
        /// <param name="force">if set to <c>true</c> [force].</param>
        /// <param name="cancellationToken">The cancellation token.</param>
        /// <returns>Task{System.Boolean}.</returns>
        public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
        {
            var episode = (Episode)item;

            episode.IndexNumber = TVUtils.GetEpisodeNumberFromFile(item.Path, item.Parent is Season);
            episode.IndexNumberEnd = TVUtils.GetEndingEpisodeNumberFromFile(item.Path);

            if (!episode.ParentIndexNumber.HasValue)
            {
                var season = episode.Parent as Season;

                if (season != null)
                {
                    episode.ParentIndexNumber = season.IndexNumber;
                }
            }

            SetLastRefreshed(item, DateTime.UtcNow);

            return TrueTaskResult;
        }

        /// <summary>
        /// Gets the priority.
        /// </summary>
        /// <value>The priority.</value>
        public override MetadataProviderPriority Priority
        {
            get { return MetadataProviderPriority.First; }
        }
    }
}