#include "terrain.h"

#include <noise/noise.h>
#include "noiseutils/noiseutils.h"

#include <iostream>

using namespace noise;

float *Terrain::generate_heights(int x, int y, int width, int height) {
	module::Perlin mod;
	mod.SetSeed(0);

	utils::NoiseMap heightmap;
	utils::NoiseMapBuilderPlane heightmap_builder;

	heightmap_builder.SetSourceModule(mod);
	heightmap_builder.SetDestNoiseMap(heightmap);

	heightmap_builder.SetDestSize(width, height);
	heightmap_builder.SetBounds((double)x / 100, (double)(x+width) / 100, (double)y / 100, (double)(y+height) / 100);
	heightmap_builder.Build();

	float *heights = new float[width*height];
	for(int i = 0; i < width; i++) {
		for(int j = 0; j < height; j++) {
			heights[i*height + j] = 10*(1+heightmap.GetValue(i, j));
		}
	}

	chunk_indices.insert(std::pair<int, int>(x, y));

	return heights;
}

float *Terrain::get_chunk(int x, int y, int width, int height) {
	return generate_heights(x, y, width, height);
}

bool Terrain::has_chunk(int x, int y) {
	return chunk_indices.find(std::pair<int, int>(x, y)) != chunk_indices.end();
}