using UnityEngine;
using System.Collections;
using TransportGame.Utils;
using System.Threading;
using TransportGame.Generator;
using TransportGame.Model;
using TransportGame.Business;

public class TerrainGeneratorScript : MonoBehaviour
{
	private Map map = null;

	public int TerrainWidth = 1024;
	public int TerrainHeight = 1024;
	public GameObject WaterObject;

	// Use this for initialization
	void Start()
	{
		StartCoroutine(GenerateMap());
	}

	private void GenerateTerrainThread()
	{
		TerrainGenerator generator = new TerrainGenerator();
		map = generator.Generate(TerrainWidth, TerrainHeight);
	}

	private Mesh GenerateWater()
	{
		Mesh water = new Mesh();
		water.name = "water";
		water.vertices = new[] { 
			new Vector3(0, map.WaterLevel, 0), 
			new Vector3(0, map.WaterLevel, map.Height), 
			new Vector3(map.Width, map.WaterLevel, 0), 
			new Vector3(map.Width, map.WaterLevel, map.Height)
		};
		water.triangles = new[] { 0, 1, 2, 2, 1, 3 };
		water.uv = new[] {
			new Vector2(0, 0),
			new Vector2(0, 1),
			new Vector2(1, 0),
			new Vector2(1, 1)
		};
		water.RecalculateNormals();

		return water;
	}

	private IEnumerator GenerateMap()
	{
		// Wait for the map generation thread
		foreach (var i in Task.RunAsync(GenerateTerrainThread))
			yield return i;

		// Generate terrain data
		TerrainData terrainData = new TerrainData();
		terrainData.heightmapResolution = Mathf.Max(map.Height, map.Width) + 1;
		terrainData.size = new Vector3(map.Width, map.Biome.Height, map.Height);
		terrainData.SetDetailResolution(1024, 8);
		terrainData.SetHeights(0, 0, map.Heights);
		terrainData.name = "Generated Terrain Data";
		yield return null;

		// Create terrain object
		GameObject terrain = Terrain.CreateTerrainGameObject(terrainData);
		terrain.name = "Generated Terrain";
		yield return null;

		Terrain terrainComp = terrain.GetComponent<Terrain>();
		terrainComp.heightmapPixelError = 1;
		yield return null;

		// Set water
		if (WaterObject != null)
		{
			MeshFilter waterMesh = WaterObject.GetComponent<MeshFilter>();
			waterMesh.mesh = GenerateWater();
		}

		// Set up textures

	}

	// Update is called once per frame
	void Update()
	{
	}
}