package shootergame.world.layer.layergen;

import java.util.Random;

import shootergame.Main;
import shootergame.entity.Entity;
import shootergame.entity.EntityBullet;
import shootergame.entity.EntityZombie;
import shootergame.init.Tiles;
import shootergame.tiles.Tile;
import shootergame.util.math.random.OpenSimplexNoise;
import shootergame.util.math.random.RandomHelpers;
import shootergame.util.math.range.Range2i;
import shootergame.util.math.vec.Vec2d;
import shootergame.util.math.vec.Vec2i;
import shootergame.world.chunk.Chunk;
import shootergame.world.layer.Layer;

public class LayerGenEarth extends LayerGen
{

	@Override
	public Chunk generateChunk(Layer layer, Random rand, Vec2i c_pos)
	{
		// Create the new chunk
		Chunk chunk = new Chunk(layer, c_pos, rand);
		
		// Get the noise generator
		OpenSimplexNoise noisegen_n = new OpenSimplexNoise(rand.nextLong());
		
		// Loop over the layer dimensions and create land
		for(int x=0;x<Chunk.CHUNK_SIZE.mx;x++) {
			for(int y=0;y<Chunk.CHUNK_SIZE.my;y++)
			{
				// Get the x and y in the world
				int cx = x + c_pos.x * Chunk.CHUNK_SIZE.mx;
				int cy = y + c_pos.y * Chunk.CHUNK_SIZE.my;
				
				// Get the noise value and the position vector
				double noise_n = (noisegen_n.eval(cx/10.0, cy/10.0) + 1) * 50;
				Vec2i pos = new Vec2i(x, y);
				
				// Tree and rock generation
				if(rand.nextDouble() > 0.9) chunk.setFrontTile(Tiles.TREE, pos);
				else if(rand.nextDouble() > 0.99) chunk.setFrontTile(Tiles.ROCK, pos);
				else chunk.setFrontTile(Tiles.VOID, pos);
				
				// Terrain generation
				if(noise_n < 20) {
					chunk.setFrontTile(Tiles.WATER, pos);
					chunk.setBackTile(Tiles.DIRT, pos);
				}
				else if(noise_n < 60) chunk.setBackTile(Tiles.GRASS, pos);
				else if(noise_n < 80) chunk.setBackTile(Tiles.DIRT, pos);
				else chunk.setBackTile(Tiles.STONE, pos);
			}
		}
		
		// Send back the new chunk
		return chunk;
	}

	@Override
	public void spawnEntities(Layer layer, Random rand)
	{
		if(rand.nextDouble() > 0.99)
		{
			Entity zombie = new EntityZombie();
			zombie.pos = new Vec2d(
					RandomHelpers.randrange(rand, (int)Main.player.pos.x - 100, (int)Main.player.pos.x + 100),
					RandomHelpers.randrange(rand, (int)Main.player.pos.y - 100, (int)Main.player.pos.y + 100));
			layer.spawnEntity(zombie);
		}
	}
}