using UnityEngine;
using System.Collections;
using System.Collections.Generic;
 
public class CreateWorld : MonoBehaviour {
 
	public Transform worldMap;
 
	private const int MAP_WIDTH = 50;
	private const int MAP_HEIGHT = 50;
	private const int TILE_SIZE = 32;
 
	private const int IMG_ID_ARETI = 0;
	private const int IMG_ID_GRASS = 1;
	private const int IMG_ID_DESEART = 2;
	private const int IMG_ID_DART = 3;
	private const int IMG_ID_SNOW = 4;
	private const int IMG_ID_SEA = 5;
	private const int IMG_ID_DARK = 6;
 
	private List<WorldTileData> tileList;
 
	Vector2[] dir = new Vector2[]
	{
		new Vector2(1, 0),
		new Vector2(-1, 0),
		new Vector2(0, 1),
		new Vector2(0, -1),
	};
 
	public enum TileType
	{
		NONE = 0,
		ARETI,
		GRASS,
		DESEART,
		DART,
		SNOW,
		SEA,
		DARK,
	}
 
	// Use this for initialization
	void Start () {
		tileList = new List<WorldTileData>();
 
		// 外側を海にする
		for(int x = -1; x <= MAP_WIDTH; x++)
		{
			CreateSea(x, -1);
			CreateSea(x, MAP_HEIGHT);
		}
 
		for(int y = -1; y < MAP_HEIGHT; y++)
		{
			CreateSea(-1, y);
			CreateSea(MAP_WIDTH, y);
		}
 
		// ランダムで初期化
		for(int y = 0; y < MAP_HEIGHT; y++)
		{
			for(int x = 0; x < MAP_WIDTH; x++)
			{
				WorldTileData tile = new WorldTileData();
				tile.SetTileType((TileType)Random.Range(1, 9));
				tile.Obj.transform.parent = worldMap;
				tile.Obj.transform.position = new Vector3(x * TILE_SIZE * 0.01f, y * TILE_SIZE * 0.01f, 0);
				tileList.Add(tile);
			}
		}
	}
 
	private void CreateSea(int x, int y)
	{
		GameObject tileObj = Instantiate(Resources.Load("Prefabs/WorldTile")) as GameObject;
		tileObj.name = "Sea";
		tileObj.transform.position = new Vector3(x * TILE_SIZE * 0.01f, y * TILE_SIZE * 0.01f, 0);
		tileObj.GetComponent<tk2dSprite>().spriteId = IMG_ID_SEA;
		tileObj.transform.parent = worldMap;
	}
 
	private void UpdateWorld()
	{
		for(int y = 0; y < MAP_HEIGHT; y++)
		{
			for(int x = 0; x < MAP_WIDTH; x++)
			{
				// 隣接チップのいずれかにランダムチェンジ
				int dx = (int)dir[Random.Range(0,4)].x;
				int dy = (int)dir[Random.Range(0,4)].y;
 
				TileType type;
				if(x + dx < 0 || MAP_WIDTH <= x + dx || y + dy < 0 || MAP_HEIGHT <= y + dy)
					type = TileType.SEA;
				else
					type = GetTile(x + dx, y + dy).TileType;
 
				SetTile(x, y, type);
 
				// 隣接タイルが同じだったら浸食
				bool isSame = true;
				TileType sameTileType = TileType.NONE;
				for(int i = 0; i < 4; i++)
				{
					dx = (int)dir[i].x;
					dy = (int)dir[i].y;
 
					if(x + dx < 0 || MAP_WIDTH <= x + dx || y + dy < 0 || MAP_HEIGHT <= y + dy)
						type = TileType.SEA;
					else
						type = GetTile(x + dx, y + dy).TileType;
 
					if(sameTileType == TileType.NONE) 
						sameTileType = type;
					else if(sameTileType != type)
					{
						isSame = false;
						break;
					}
				}
 
				// 浸食
				if(isSame)
				{
					SetTile(x, y, sameTileType);
				}
			}
		}
	}
 
	// Update is called once per frame
	void Update () {
 
	}
 
	private WorldTileData GetTile(int x, int y)
	{
		return tileList[x + MAP_WIDTH * y];
	}
 
	private void SetTile(int x, int y, TileType type)
	{
		tileList[x + MAP_WIDTH * y].SetTileType(type);
	}
 
	public class WorldTileData
	{
		private TileType tileType;
		private GameObject obj;
 
		public WorldTileData()
		{
			obj = Instantiate(Resources.Load("Prefabs/WorldTile")) as GameObject;
			obj.name = "Tile";
			tileType = TileType.ARETI;
		}
 
		public void SetTileType(TileType tileType)
		{
			this.tileType = tileType;
			if(tileType == TileType.ARETI)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_ARETI;
			else if(tileType == TileType.GRASS)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_GRASS;
			else if(tileType == TileType.DESEART)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_DESEART;
			else if(tileType == TileType.GRASS)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_GRASS;
			else if(tileType == TileType.DART)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_DART;
			else if(tileType == TileType.SNOW)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_SNOW;
			else if(tileType == TileType.SEA)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_SEA;
			else if(tileType == TileType.DARK)
				obj.GetComponent<tk2dSprite>().spriteId = IMG_ID_DARK;
		}
 
		public TileType TileType
		{
			get { return tileType; }
		}
 
		public GameObject Obj
		{
			get { return obj; }
			set { obj = value; }
		}
	}
}