#include <string.h>

#include "common.h"
#include "gba-buttons.c"
#include "background-tiles.c"
#include "sprites.h"
#include "text.h"

//
// Main functions.
//

// TODO: Cleanup OBJ/OAM memory copying and access.
//

//
// BIOS calls
//

int bios_vblank_wait();
int bios_div(int num, int denom);

int hblank_counter = 0;

void
irs_hblank_func() {
    u16 clr = (DISP_VCOUNT / 8);
    PAL_BUFFER_BG[0] = rgb15(clr, 0, 31 - clr);
    hblank_counter++;
}

int main(void) {
    // Configure the display in mode 0 to show OBJs, where tile memory is
    // sequential.
    DISP_CTRL = DISP_ENABLE_SPRITES | DISP_MODE_0 | DISP_BG_0;

    // Initialize sprite button overlay.
    init_sprite_pal(0, COLOR_WHITE);
    init_sprites(0);
    init_button_sprites();

    // Initialize text engine.
    txt_init(0, COLOR_RED, 0);

    // Register interrupts.
    irq_init();
    irs_set(IRQ_HBLANK, irs_hblank_func);

    int frame_counter = 0;
    while(true) {
        // bios_vblank_wait();
        wait_vsync();
        poll_keys();

        txt_position(0, 1);
        txt_clear_line();
        txt_printf(" HBlank counter: %d\n", hblank_counter);
        txt_clear_line();
        txt_printf(" Frame counter: %d", frame_counter);

        frame_counter++;
        // update_button_sprites();
    };

    return 0;
}