#ifndef WORLDGEN_H
#define WORLDGEN_H

#include <stddef.h>
#include <stdint.h>
#include "noise.h"

#define CHUNK_SIZE 16
#define CHUNK_HEIGHT 256
#define WORLDGEN_HEIGHT_CACHE_SIZE 32768

	enum BlockId {
		BLOCK_BEDROCK = 0,
		BLOCK_STONE = 1,
		BLOCK_DIRT = 2,
		BLOCK_GRASS = 3,
		BLOCK_WATER = 4,
		BLOCK_AIR = 5,
		BLOCK_OAK_LOG = 6,
		BLOCK_OAK_LEAVES = 7,
		BLOCK_BIRCH_LOG = 8,
		BLOCK_BIRCH_LEAVES = 9,
		BLOCK_COAL = 10,
		BLOCK_SAND = 11,
		BLOCK_GRAVEL = 12,
		BLOCK_SNOW = 13,
		BLOCK_TALL_GRASS = 14,
		BLOCK_WILDFLOWER = 15,
		BLOCK_COPPER_ORE = 16,
		BLOCK_IRON_ORE = 17,
		BLOCK_GOLD_ORE = 18,
		BLOCK_REDSTONE_ORE = 19,
		BLOCK_LAPIS_ORE = 20,
		BLOCK_DIAMOND_ORE = 21,
		BLOCK_OAK_PLANKS = 22,
		BLOCK_SPRUCE_PLANKS = 23,
		BLOCK_OAK_LOG_X = 24,
		BLOCK_OAK_LOG_Z = 25,
		BLOCK_SPRUCE_LOG_X = 26,
		BLOCK_SPRUCE_LOG_Z = 27,
		BLOCK_GLASS_PANE = 28,
		BLOCK_GLASS = 29,
		BLOCK_SPRUCE_DOOR_S_LOWER = 30,
		BLOCK_SPRUCE_DOOR_S_UPPER = 31,
		BLOCK_SPRUCE_DOOR_N_LOWER = 32,
		BLOCK_SPRUCE_DOOR_N_UPPER = 33,
		BLOCK_SPRUCE_DOOR_W_LOWER = 34,
		BLOCK_SPRUCE_DOOR_W_UPPER = 35,
		BLOCK_SPRUCE_DOOR_E_LOWER = 36,
		BLOCK_SPRUCE_DOOR_E_UPPER = 37,
		BLOCK_SPRUCE_STAIRS_E = 38,
		BLOCK_SPRUCE_STAIRS_W = 39,
		BLOCK_LADDER_N = 40,
		BLOCK_LADDER_S = 41,
		BLOCK_LADDER_W = 42,
		BLOCK_LADDER_E = 43,
		BLOCK_SMOOTH_STONE = 44,
		BLOCK_STONE_BRICKS = 45,
		BLOCK_BLACKSTONE = 46,
		BLOCK_IRON_BARS = 47,
		BLOCK_STONE_BRICK_STAIRS_E = 48,
		BLOCK_STONE_BRICK_STAIRS_W = 49,
		BLOCK_STONE_BRICK_STAIRS_N = 50,
		BLOCK_STONE_BRICK_STAIRS_S = 51,
		BLOCK_DANDELION = 52,
		BLOCK_AZURE_BLUET = 53,
		BLOCK_OXEYE_DAISY = 54,
		BLOCK_CORNFLOWER = 55,
		BLOCK_LILY_OF_THE_VALLEY = 56,
		BLOCK_FERN = 57,
		BLOCK_CLAY = 58,
		BLOCK_SEAGRASS = 59,
		BLOCK_IRON_BARS_NS = 60,
		BLOCK_IRON_BARS_EW = 61
	};

struct trail_segment;

typedef struct {
	int chunk_x;
	int chunk_z;
	uint16_t heightmap[CHUNK_SIZE][CHUNK_SIZE];
	uint16_t blocks[CHUNK_HEIGHT][CHUNK_SIZE][CHUNK_SIZE];
} chunk_data;

typedef struct {
	int x;
	int z;
	int value;
	uint8_t valid;
} worldgen_height_cache_entry;

typedef struct {
	simplex_noise noise;
	int sea_level;
	int world_seed;
	int enable_trails;
	int enable_wall;
	int wall_min_x, wall_max_x, wall_min_z, wall_max_z;
	int snow_line;
	struct trail_segment *trail_segments;
	size_t trail_segment_count;
	size_t trail_segment_cap;
	int prepass_done;
	int prepass_min_x, prepass_max_x, prepass_min_z, prepass_max_z;
	worldgen_height_cache_entry height_cache[WORLDGEN_HEIGHT_CACHE_SIZE];
} worldgen_ctx;

void worldgen_init(worldgen_ctx *ctx, int world_seed, int sea_level, int snow_line);
void worldgen_generate_chunk(worldgen_ctx *ctx, int chunk_x, int chunk_z, chunk_data *out);
void worldgen_prepass(worldgen_ctx *ctx, int min_x, int max_x, int min_z, int max_z);
void worldgen_free_trails(worldgen_ctx *ctx);
int worldgen_debug_biome(worldgen_ctx *ctx, int x, int z);
double worldgen_debug_redwood_mask(worldgen_ctx *ctx, int x, int z);

#endif