using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using MediaBrowser.Controller.Extensions;
using MediaBrowser.Controller.Providers;
using MediaBrowser.Model.Configuration;
using MediaBrowser.Model.Entities;
using MediaBrowser.Model.Serialization;
using MediaBrowser.Model.Users;
using Microsoft.Extensions.Logging;

namespace MediaBrowser.Controller.Entities.Audio
{
    /// <summary>
    /// Class MusicArtist
    /// </summary>
    public class MusicArtist : Folder, IItemByName, IHasMusicGenres, IHasDualAccess, IHasLookupInfo<ArtistInfo>
    {
        [IgnoreDataMember]
        public bool IsAccessedByName => ParentId.Equals(Guid.Empty);

        [IgnoreDataMember]
        public override bool IsFolder => !IsAccessedByName;

        [IgnoreDataMember]
        public override bool SupportsInheritedParentImages => false;

        [IgnoreDataMember]
        public override bool SupportsCumulativeRunTimeTicks => true;

        [IgnoreDataMember]
        public override bool IsDisplayedAsFolder => true;

        [IgnoreDataMember]
        public override bool SupportsAddingToPlaylist => true;

        [IgnoreDataMember]
        public override bool SupportsPlayedStatus => false;

        public override double GetDefaultPrimaryImageAspectRatio()
        {
            return 1;
        }

        public override bool CanDelete()
        {
            return !IsAccessedByName;
        }

        public IList<BaseItem> GetTaggedItems(InternalItemsQuery query)
        {
            if (query.IncludeItemTypes.Length == 0)
            {
                query.IncludeItemTypes = new[] { typeof(Audio).Name, typeof(MusicVideo).Name, typeof(MusicAlbum).Name };
                query.ArtistIds = new[] { Id };
            }

            return LibraryManager.GetItemList(query);
        }

        [IgnoreDataMember]
        public override IEnumerable<BaseItem> Children
        {
            get
            {
                if (IsAccessedByName)
                {
                    return new List<BaseItem>();
                }

                return base.Children;
            }
        }

        public override int GetChildCount(User user)
        {
            if (IsAccessedByName)
            {
                return 0;
            }
            return base.GetChildCount(user);
        }

        public override bool IsSaveLocalMetadataEnabled()
        {
            if (IsAccessedByName)
            {
                return true;
            }

            return base.IsSaveLocalMetadataEnabled();
        }

        protected override Task ValidateChildrenInternal(IProgress<double> progress, CancellationToken cancellationToken, bool recursive, bool refreshChildMetadata, MetadataRefreshOptions refreshOptions, IDirectoryService directoryService)
        {
            if (IsAccessedByName)
            {
                // Should never get in here anyway
                return Task.CompletedTask;
            }

            return base.ValidateChildrenInternal(progress, cancellationToken, recursive, refreshChildMetadata, refreshOptions, directoryService);
        }

        public override List<string> GetUserDataKeys()
        {
            var list = base.GetUserDataKeys();

            list.InsertRange(0, GetUserDataKeys(this));
            return list;
        }

        /// <summary>
        /// Returns the folder containing the item.
        /// If the item is a folder, it returns the folder itself
        /// </summary>
        /// <value>The containing folder path.</value>
        [IgnoreDataMember]
        public override string ContainingFolderPath => Path;

        /// <summary>
        /// Gets the user data key.
        /// </summary>
        /// <param name="item">The item.</param>
        /// <returns>System.String.</returns>
        private static List<string> GetUserDataKeys(MusicArtist item)
        {
            var list = new List<string>();
            var id = item.GetProviderId(MetadataProviders.MusicBrainzArtist);

            if (!string.IsNullOrEmpty(id))
            {
                list.Add("Artist-Musicbrainz-" + id);
            }

            list.Add("Artist-" + (item.Name ?? string.Empty).RemoveDiacritics());
            return list;
        }
        public override string CreatePresentationUniqueKey()
        {
            return "Artist-" + (Name ?? string.Empty).RemoveDiacritics();
        }
        protected override bool GetBlockUnratedValue(UserPolicy config)
        {
            return config.BlockUnratedItems.Contains(UnratedItem.Music);
        }

        public override UnratedItem GetBlockUnratedType()
        {
            return UnratedItem.Music;
        }

        public ArtistInfo GetLookupInfo()
        {
            var info = GetItemLookupInfo<ArtistInfo>();

            info.SongInfos = GetRecursiveChildren(i => i is Audio)
                .Cast<Audio>()
                .Select(i => i.GetLookupInfo())
                .ToList();

            return info;
        }

        [IgnoreDataMember]
        public override bool SupportsPeople => false;

        public static string GetPath(string name)
        {
            return GetPath(name, true);
        }

        public static string GetPath(string name, bool normalizeName)
        {
            // Trim the period at the end because windows will have a hard time with that
            var validName = normalizeName ?
                FileSystem.GetValidFilename(name).Trim().TrimEnd('.') :
                name;

            return System.IO.Path.Combine(ConfigurationManager.ApplicationPaths.ArtistsPath, validName);
        }

        private string GetRebasedPath()
        {
            return GetPath(System.IO.Path.GetFileName(Path), false);
        }

        public override bool RequiresRefresh()
        {
            if (IsAccessedByName)
            {
                var newPath = GetRebasedPath();
                if (!string.Equals(Path, newPath, StringComparison.Ordinal))
                {
                    Logger.LogDebug("{0} path has changed from {1} to {2}", GetType().Name, Path, newPath);
                    return true;
                }
            }
            return base.RequiresRefresh();
        }

        /// <summary>
        /// This is called before any metadata refresh and returns true or false indicating if changes were made
        /// </summary>
        public override bool BeforeMetadataRefresh(bool replaceAllMetdata)
        {
            var hasChanges = base.BeforeMetadataRefresh(replaceAllMetdata);

            if (IsAccessedByName)
            {
                var newPath = GetRebasedPath();
                if (!string.Equals(Path, newPath, StringComparison.Ordinal))
                {
                    Path = newPath;
                    hasChanges = true;
                }
            }

            return hasChanges;
        }
    }
}
