#include <cmath>
#include "world.h"
#include "bettola/game/chunk.h"
#include "bettola/game/terrain.h"

float World::get_height(float world_x, float world_z) {
  /*
   * Mesh generation uses (WIDTH-1), so account for it
   * when calculating the chunk and local coords.
   */
  float chunk_width   = (float)(BettolaLib::Game::CHUNK_WIDTH-1);
  float chunk_height  = (float)(BettolaLib::Game::CHUNK_HEIGHT-1);

  int chunk_x = floor(world_x / chunk_width);
  int chunk_z = floor(world_z / chunk_height);

  float local_x = world_x - (chunk_x * chunk_width);
  float local_z = world_z - (chunk_z * chunk_height);

  BettolaLib::Game::Chunk& chunk = get_chunk(chunk_x, chunk_z);

  return BettolaLib::Game::Terrain::get_height_at(chunk, local_x, local_z);
}