using System.Linq;
using System.Threading.Tasks;
using PetaPoco.Business;
using Sony.Filtr.DistributedCaching;

namespace Sony.Filtr.SpotifyImages
{
    public class SpotifyImageManager
    {
        private readonly DistributedCacheHandler _distributedCacheHandler;

        public SpotifyImageManager(DistributedCacheHandler distributedCacheHandler)
        {
            _distributedCacheHandler = distributedCacheHandler;
        }

        public void AddLocalImageData(PlaylistImageData localImageData)
        {
            PetaPocoRepository.Instance.Db.Insert(localImageData);
            ClearCache(localImageData.PlaylistId);
        }

        public void UpdateLocalImageData(PlaylistImageData localImageData)
        {
            PetaPocoRepository.Instance.Update(localImageData);
            ClearCache(localImageData.PlaylistId);
        }

        private void ClearCache(string playlistId)
        {
            _distributedCacheHandler.Remove(BuildPlaylistImageDataCacheKey(playlistId));
        }

        public async Task<PlaylistImageData> GetCachedImageDataAsync(string playlistId)
        {
            var cacheKey = BuildPlaylistImageDataCacheKey(playlistId);
            var playlistImageData = _distributedCacheHandler.Get(cacheKey) as PlaylistImageData;
            if (playlistImageData == null)
            {
                playlistImageData = PetaPocoRepository.ReadOnlyInstance.SingleOrDefault<PlaylistImageData>(playlistId);
                _distributedCacheHandler.Put(cacheKey, playlistImageData);
            }

            return playlistImageData;
        }

        private string BuildPlaylistImageDataCacheKey(string playlistId)
        {
            return $"SpotifyImageManager:{playlistId}";
        }
    }
}