using System.Collections.Generic;
using Facepunch.Steamworks.Data;

namespace Facepunch.Steamworks.Ugc
{
	public struct ResultPage : System.IDisposable
	{
		internal UGCQueryHandle_t Handle;

		public int ResultCount;
		public int TotalCount;

		public bool CachedData;

		public IEnumerable<Item> Entries
		{
			get
			{

				var details = default( SteamUGCDetails_t );
				for ( uint i=0; i< ResultCount; i++ )
				{
					if ( SteamUGC.Internal.GetQueryUGCResult( Handle, i, ref details ) )
					{
						var item = Item.From( details );

						item.NumSubscriptions = GetStat( i, ItemStatistic.NumSubscriptions );
						item.NumFavorites = GetStat( i, ItemStatistic.NumFavorites );
						item.NumFollowers = GetStat( i, ItemStatistic.NumFollowers );
						item.NumUniqueSubscriptions = GetStat( i, ItemStatistic.NumUniqueSubscriptions );
						item.NumUniqueFavorites = GetStat( i, ItemStatistic.NumUniqueFavorites );
						item.NumUniqueFollowers = GetStat( i, ItemStatistic.NumUniqueFollowers );
						item.NumUniqueWebsiteViews = GetStat( i, ItemStatistic.NumUniqueWebsiteViews );
						item.ReportScore = GetStat( i, ItemStatistic.ReportScore );
						item.NumSecondsPlayed = GetStat( i, ItemStatistic.NumSecondsPlayed );
						item.NumPlaytimeSessions = GetStat( i, ItemStatistic.NumPlaytimeSessions );
						item.NumComments = GetStat( i, ItemStatistic.NumComments );
						item.NumSecondsPlayedDuringTimePeriod = GetStat( i, ItemStatistic.NumSecondsPlayedDuringTimePeriod );
						item.NumPlaytimeSessionsDuringTimePeriod = GetStat( i, ItemStatistic.NumPlaytimeSessionsDuringTimePeriod );

						if ( SteamUGC.Internal.GetQueryUGCPreviewURL( Handle, i, out string preview ) )
						{
							item.PreviewImageUrl = preview;
						}

						// TODO GetQueryUGCAdditionalPreview
						// TODO GetQueryUGCChildren
						// TODO GetQueryUGCKeyValueTag
						// TODO GetQueryUGCMetadata


						yield return item;
					}
				}
			}
		}

		private ulong GetStat( uint index, ItemStatistic stat )
		{
			ulong val = 0;

			if ( !SteamUGC.Internal.GetQueryUGCStatistic( Handle, index, stat, ref val ) )
				return 0;

			return val;
		}

		public void Dispose()
		{
			if ( Handle > 0 )
			{
				SteamUGC.Internal.ReleaseQueryUGCRequest( Handle );
				Handle = 0;
			}
		}
	}
}