#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 int data[GLERMINAL_CELL_AREA];
} glerminal_sprite;

/**
 * @brief Call init once, then run the application's mainloop
 * @param init initialization callback
 * @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, 40)
 * @param y position of the cell in the range [0, 25)
 * @param layer layer of the cell in the range [0, 8)
 * @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, 40)
 * @param y position of the cell in the range [0, 25)
 * @param layer layer of the cell in the range [0, 8)
 * @return sprite index currently assigned to the cell
 */
unsigned char glerminal_get(unsigned char x, unsigned char y, unsigned char layer);
/**
 * @brief Set a cell's offset
 * @param x position of the cell in the range [0, 40)
 * @param y position of the cell in the range [0, 25)
 * @param layer layer of the cell in the range [0, 8)
 * @param x_offset offset of the cell on the x axis in the range [-128, 127], where 0 is no offset
 * @param y_offset offset of the cell on the y axis in the range [-128, 127], where 0 is no offset
 */
void glerminal_offset(unsigned char x, unsigned char y, unsigned char layer, float x_offset, float y_offset);

/**
 * @brief Set a layer's color
 * @param layer The layer to modify
 * @param color The new color
 */
void glerminal_layer_color(unsigned char layer, unsigned int color);
/**
 * @brief Set a layer's scale
 * @param layer The layer to modify
 * @param scale The new scale
 */
void glerminal_layer_scale(unsigned char layer, float scale);

/**
 * @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);

#ifdef __cplusplus
}
#endif

#endif//GLERMINAL_H