package shootergame.world.layer.layergen;

import java.util.Random;

import shootergame.Main;
import shootergame.entity.Entity;
import shootergame.entity.EntityZombie;
import shootergame.init.Tiles;
import shootergame.util.math.TileState;
import shootergame.util.math.random.OpenSimplexNoise;
import shootergame.util.math.random.RandomHelpers;
import shootergame.util.math.vec.Vec2d;
import shootergame.util.math.vec.Vec2i;
import shootergame.util.math.vec.Vec3d;
import shootergame.world.chunk.Chunk;
import shootergame.world.layer.Layer;

public class LayerGenEarth extends LayerGen
{

	@Override
	public void generateChunk(Chunk chunk, Layer layer, long seed, Random rand, Vec2i c_pos)
	{
		// Is there going to be a portal in this chunk
		boolean portal = RandomHelpers.randrange(rand, 10) == 0;
		Vec2i portal_pos = null;
		if(portal) portal_pos = new Vec2i(
				RandomHelpers.randrange(rand, Chunk.CHUNK_SIZE.mx),
				RandomHelpers.randrange(rand, Chunk.CHUNK_SIZE.my));
		
		// Get the noise generator
		OpenSimplexNoise noisegen_n = new OpenSimplexNoise(seed);
		
		// 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(new TileState(Tiles.TREE,
						(short)RandomHelpers.randrange(rand, Short.MAX_VALUE)), pos);
				else if(rand.nextDouble() > 0.99) chunk.setFrontTile(new TileState(Tiles.ROCK,
						(short)RandomHelpers.randrange(rand, Short.MAX_VALUE)), pos);
				else chunk.setFrontTile(Tiles.VOID.getDefaultState(), pos);
				
				// Terrain generation
				if(noise_n < 40) {
					chunk.setFrontTile(Tiles.WATER.getDefaultState(), pos);
					chunk.setBackTile(Tiles.DIRT.getDefaultState(), pos);
				}
				else if(noise_n < 70) chunk.setBackTile(Tiles.GRASS.getDefaultState(), pos);
				else if(noise_n < 90) chunk.setBackTile(Tiles.DIRT.getDefaultState(), pos);
				else chunk.setBackTile(Tiles.STONE.getDefaultState(), pos);
			}
		}
		
		if(portal) {
			chunk.setBackTile(new TileState(Tiles.PORTAL_DOWN, (short)1), portal_pos);
			chunk.setFrontTile(Tiles.LADDER.getDefaultState(), portal_pos);
		}
	}

	@Override
	public void spawnEntities(Layer layer, Random rand)
	{
		if(rand.nextDouble() > 0.98)
		{
			Entity zombie = new EntityZombie();
			zombie.pos = new Vec2d(
					RandomHelpers.randrange(rand, (int)Main.player.pos.x - 128, (int)Main.player.pos.x + 128),
					RandomHelpers.randrange(rand, (int)Main.player.pos.y - 128, (int)Main.player.pos.y + 128));
			
			if(zombie.pos.squareDistance(Main.player.pos) > 64)
				layer.spawnEntity(zombie);
		}
	}
	
	@Override
	public TileState getTileDestroyed() {
		return Tiles.DIRT.getDefaultState();
	}
	
	@Override
	public Vec3d getLightLevel() {
		return new Vec3d(0.3, 0.3, 0.3);
	}
}