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using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using CreativeSpore.SuperTilemapEditor;

namespace PixelCrushers
{

    // Pixel Crushers saver component for an STE tilemap.
    [RequireComponent(typeof(STETilemap))]
    public class STETilemapSaver : Saver
    {
    
        [System.Serializable]
        public class TilemapSerializedData // From: https://creativespore.com/2018/07/03/how-to-iterate-a-tilemap/
        {
            [System.Serializable]
            public class TileData
            {
                public int gridX;
                public int gridY;
                public uint tileData;
            }
            public List<TileData> tileDataList = new List<TileData>();
        }
         
        public static TilemapSerializedData SerializeTilemap(STETilemap tilemap)
        {
            TilemapSerializedData data = new TilemapSerializedData();
            System.Action<STETilemap, int, int, uint> action = (tmap, gridX, gridY, tileData) =>
            {
                data.tileDataList.Add(new TilemapSerializedData.TileData() { gridX = gridX, gridY = gridY, tileData = tileData});
            };
            TilemapUtils.IterateTilemapWithAction(tilemap, action);
            return data;
        }

        public static void DeserializeTilemap(TilemapSerializedData data, STETilemap tilemap)
        {
            foreach (TilemapSerializedData.TileData dataItem in data.tileDataList)
            {
                tilemap.SetTileData(dataItem.gridX, dataItem.gridY, dataItem.tileData); // NOT SURE ABOUT THIS LINE.

            }
            tilemap.UpdateMesh();
        }

        // RecordData() is called when saving. It returns a string representation of the save data.
        public override string RecordData()
        {
            STETilemap tilemap = GetComponent<STETilemap>();
            if (tilemap == null) return string.Empty;
            TilemapSerializedData data = SerializeTilemap(tilemap);
            return SaveSystem.Serialize(data);
        }

        // ApplyData() is called when loading. It receives a string representation of the
        // save data and applies it to the tilemap.
        public override void ApplyData(string s)
        {
            if (string.IsNullOrEmpty(s)) return;
              TilemapSerializedData data = SaveSystem.Deserialize<TilemapSerializedData>(s);
            if (data != null)
            {
                DeserializeTilemap(data, GetComponent<STETilemap>());
            }
        }
    }
}