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using System;
using System.Linq;
using System.Collections.Generic;
using System.Data;
using System.Data.Common;
using System.Data.SQLite;

using ProtoBuf;



using Vintagestory.API.Common;
using Vintagestory.GameContent;
using Vintagestory.API.Util;
using Vintagestory.API.MathTools;

namespace ShardProcessor
{
	public class WalkableMapDB : MapDB
	{
		private SQLiteCommand walkMapPieceCmd;

		public WalkableMapDB(ILogger logger) : base(logger)
        {
		}

		public override void OnOpened( )
		{
		base.OnOpened( );

		walkMapPieceCmd = sqliteConn.CreateCommand( );
		walkMapPieceCmd.CommandText = @"SELECT position, data FROM mappiece";
		walkMapPieceCmd.Prepare( );
		}


		public IEnumerable<LocalizedMapPiece> WalkMapTiles( )
		{			
		using (SQLiteDataReader sqlite_datareader = walkMapPieceCmd.ExecuteReader( )) 
		{
		int numForPos = sqlite_datareader.GetOrdinal(@"position");
		int numForData = sqlite_datareader.GetOrdinal(@"data");

			while (sqlite_datareader.Read( )) 
				{					
				var posInteger = sqlite_datareader.GetInt64(numForPos);//[];//Integer KEY		
				object data = sqlite_datareader[numForData];
				if (data == null) yield return null;

				var rawMapP = SerializerUtil.Deserialize<MapPieceDB>(data as byte[ ]);

					var nextPiece = new LocalizedMapPiece( ) {
					ChunkPos = posInteger.Convert(),
					Pixels =  rawMapP.Pixels,
					};

				yield return nextPiece;
				}
			}
		}
	}

	public class LocalizedMapPiece : MapPieceDB
	{
		public Vec2i ChunkPos;

	}

	public static class MapDB_Assist
	{
		public static Vec2i Convert(this long input)
		{
		var vector = new Vec2i( );
		vector.X = ( int )(0x7FFFFFF & input); //Passthru only last 27 bits
		vector.Y = ( int )(input >> 27 );//Shift 27 right
		return vector;
		}
	}

}