#ifndef ISTD_TILEMAP_CHUNK_H
#define ISTD_TILEMAP_CHUNK_H
#include "tile.h"
#include <cstdint>

namespace istd {

// Forward declaration
enum class BiomeType : std::uint8_t;

// Position within a chunk's sub-chunk grid
struct SubChunkPos {
	std::uint8_t sub_x;
	std::uint8_t sub_y;

	constexpr SubChunkPos(std::uint8_t x, std::uint8_t y): sub_x(x), sub_y(y) {}
};

// Represents the position of a tile in the map, using chunk and local
// coordinates
struct TilePos {
	uint8_t chunk_x;
	uint8_t chunk_y;
	uint8_t local_x;
	uint8_t local_y;
};

struct Chunk {
	// Size of a chunk in tiles (64 x 64)
	static constexpr uint8_t size = 64;

	// Sub-chunk size in tiles
	static constexpr uint8_t subchunk_size = 4;

	// Number of sub-chunks in each dimension
	static constexpr uint8_t subchunk_count = size / subchunk_size;

	// array of tile types
	Tile tiles[size][size];

	// array of biomes for sub-chunks
	BiomeType biome[subchunk_count][subchunk_count];

	// Get biome for a specific sub-chunk position
	BiomeType &get_biome(SubChunkPos pos) {
		return biome[pos.sub_x][pos.sub_y];
	}

	// Get biome for a specific sub-chunk position (const version)
	const BiomeType &get_biome(SubChunkPos pos) const {
		return biome[pos.sub_x][pos.sub_y];
	}
};

// Get the starting tile coordinates for a sub-chunk
std::pair<std::uint8_t, std::uint8_t> subchunk_to_tile_start(SubChunkPos pos);

} // namespace istd

#endif