#ifndef TILESET_H
#define TILESET_H

#include "settings.h"
#include <raylib.h>

// Maximum number of tiles that can be registered in a single atlas
#define MAX_TILE_ID 32

// Tile IDs for map tiles (variants for visual variety)
#define TILE_WALL_0 0
#define TILE_WALL_1 1
#define TILE_FLOOR_0 2
#define TILE_FLOOR_1 3
#define TILE_FLOOR_2 4
#define TILE_FLOOR_3 5
#define TILE_STAIRS_SPRITE 6

// Sprite IDs for entities
#define SPRITE_PLAYER 7
#define SPRITE_PLAYER_WALK_0 8
#define SPRITE_PLAYER_WALK_1 9
#define SPRITE_PLAYER_ATTACK 10
#define SPRITE_ENEMY_GOBLIN 11
#define SPRITE_ENEMY_GOBLIN_WALK_0 12
#define SPRITE_ENEMY_GOBLIN_WALK_1 13
#define SPRITE_ENEMY_GOBLIN_ATTACK 14
#define SPRITE_ENEMY_SKELETON 15
#define SPRITE_ENEMY_SKELETON_WALK_0 16
#define SPRITE_ENEMY_SKELETON_WALK_1 17
#define SPRITE_ENEMY_SKELETON_ATTACK 18
#define SPRITE_ENEMY_ORC 19
#define SPRITE_ENEMY_ORC_WALK_0 20
#define SPRITE_ENEMY_ORC_WALK_1 21
#define SPRITE_ENEMY_ORC_ATTACK 22
#define SPRITE_ITEM_POTION 23
#define SPRITE_ITEM_WEAPON 24
#define SPRITE_ITEM_ARMOR 25

// Door tiles
#define TILE_DOOR_CLOSED_SPRITE 26
#define TILE_DOOR_OPEN_SPRITE 27

// Effect/status sprites
#define SPRITE_EFFECT_BURN 28
#define SPRITE_EFFECT_POISON 29
#define SPRITE_EFFECT_BLOCK 30
#define SPRITE_SLASH_EFFECT 31

// Total count of defined tiles
#define NUM_TILE_IDS 32

// Tileset encapsulates a GPU texture atlas with sub-rectangle regions per tile ID.
// The atlas is built at startup by painting into a RenderTexture, then finalized
// into a regular Texture2D for efficient drawing via DrawTexturePro.
typedef struct {
  RenderTexture2D render_target;   // RenderTexture for painting (valid before finalize)
  Texture2D atlas;                 // GPU texture (valid after finalize)
  int tile_w;                      // width of each tile in pixels
  int tile_h;                      // height of each tile in pixels
  Rectangle regions[MAX_TILE_ID];  // sub-rectangles within atlas for each tile ID
  int tile_count;                  // number of registered tiles
  int atlas_cols;                  // number of columns in the atlas grid
  int atlas_rows;                  // number of rows in the atlas grid
  int finalized;                   // 1 after tileset_finalize called, 0 otherwise
} Tileset;

// Initialize a tileset with the given tile dimensions.
// Computes atlas grid size based on MAX_TILE_ID and allocates a RenderTexture.
// Returns 0 on failure (e.g., RenderTexture allocation failed), non-zero on success.
int tileset_init(Tileset *ts, int tile_w, int tile_h);

// Register a tile ID with its atlas region.
// The region is computed automatically based on tile_w/tile_h and the ID index.
// Returns 0 if the ID is out of bounds or already registered, non-zero on success.
int tileset_register(Tileset *ts, int id);

// Finalize the tileset: converts the internal RenderTexture into a regular Texture2D
// suitable for DrawTexturePro. After this call, painting functions must not be used.
// Returns 0 on failure, non-zero on success.
int tileset_finalize(Tileset *ts);

// Get the atlas sub-rectangle for a given tile ID.
// Returns a zeroed Rectangle if the ID is invalid or not registered.
Rectangle tileset_get_region(const Tileset *ts, int id);

// Destroy a tileset, unloading the atlas texture and zeroing the struct.
// Safe to call on a zero-initialized or already-destroyed tileset.
void tileset_destroy(Tileset *ts);

#endif  // TILESET_H