#ifndef GLERMINAL_H
#define GLERMINAL_H

#ifdef __cplusplus
extern "C"
{
#endif

enum
{
	GLERMINAL_CELL_SIZE = 8,
	GLERMINAL_CELL_AREA = GLERMINAL_CELL_SIZE * GLERMINAL_CELL_SIZE
};

typedef void (*glerminal_init_cb)();
typedef void (*glerminal_main_cb)(float dt);

typedef struct glerminal_sprite
{
	unsigned char data[GLERMINAL_CELL_AREA];
} glerminal_sprite;

/**
 * @brief Call init once, then run the application's mainloop
 * @param main main calllback
 */
void glerminal_run(glerminal_init_cb init, glerminal_main_cb main);

/**
 * @brief Update the displayed screen contents to the current state of the library
 */
void glerminal_flush();

/**
 * @brief Set a cell's sprite
 * @param x position of the cell in the range [0, 32)
 * @param y position of the cell in the range [0, 20)
 * @param layer layer of the cell in the range [0, 16)
 * @param sprite sprite's index in the range [0, 256)
 */
void glerminal_set(unsigned char x, unsigned char y, unsigned char layer, unsigned char sprite);
/**
 * @brief Get a cell's sprite
 * @param x position of the cell in the range [0, 32)
 * @param y position of the cell in the range [0, 20)
 * @param layer layer of the cell in the range [0, 16)
 * @return sprite index currently assigned to the cell
 */
unsigned char glerminal_get(unsigned char x, unsigned char y, unsigned char layer);

/**
 * @brief Upload sprite to the given sprite ID
 * @param id The ID of the sprite to change
 * @param sprite The new sprite
 */
void glerminal_update_sprite(unsigned char id, glerminal_sprite sprite);

/**
 * @brief Update palette color at index ID
 * @param id Palette index to update
 * @param color New color
 */
void glerminal_update_palette(unsigned char id, unsigned int color);

#ifdef __cplusplus
}
#endif

#endif//GLERMINAL_H