#include <stubs.h>

#include <stdint.h>
#include <string.h>

#include "utility.h"
#include "mem_registers.h"
#include "mem_map.h"
#include "input.h"
#include "game_logic.h"
#include "game_graphics.h"

void __low_level_init(void);

// Low level initialization
void __low_level_init(void) {
	POKE(P3_PWRDUP, 0); // Dirty the value checked by the reset vector
	PEEK(IO_ROMSEL); // Make sure the ROM is selected
	
	PEEK(IO_DISPLAY_BW); // Disable colors
	PEEK(IO_DISPLAY_PAGE1); // Select the first display page
	
	// Clear display memory
	memset((void*)DISPLAY_PAGE_1, 0, DISPLAY_PAGE_SIZE);
	memset((void*)DISPLAY_PAGE_2, 0, DISPLAY_PAGE_SIZE);
}

__task int main(void) {
	game_state state;
		
	while(1){ // Outer loop
		reset_game();
		draw_game_background();

		while(1) { // Game loop
			lfsr_update();
		
			switch(read_kb()) {
				case K_UP:
					state = step_game(UP);
					break;
				case K_DOWN:
					state = step_game(DOWN);
					break;
				case K_LEFT:
					state = step_game(LEFT);
					break;
				case K_RIGHT:
					state = step_game(RIGHT);
					break;
				default:
					continue; // Do nothing, loop again
			}
	
			// If we have finished, break out of this loop
			if(state.done) break;
			
			// Unable to add a tile. We lost!!!
			if(!add_random_tile()) break;
			
			draw_tiles();
		}

	};
		
	return 0; 
}