/** @file   game.c
    @author Bryan Lim & Sam Scott
    @date   10 October 2017
    @brief  Paper Scissors Rock Game!
*/

#include "system.h"
#include "tinygl.h"
#include "navswitch.h"
#include "button.h"
#include "ir_uart.h"
#include "pacer.h"
#include "../fonts/font5x7_1.h"
#include "menu.h"

#define PACER_RATE 500

void show_hand (char character){
    char hand[1];
    hand[0] = character;
    tinygl_text (hand);
}



static uint8_t compare_hands(char my_hand, char rec_hand){
	/* Basic comparison function where if my_hand is a winning hand
	 *  the function returns 1. If it's a draw, it returns 2 and if
	 *  loss, the function retruns 0.
	 *  @param two chars that are to be compared
	 *  @return boolean value */

	if (my_hand == 'P' && rec_hand == 'S'){
		return 1;
	} else if (my_hand == 'S' && rec_hand == 'P'){
		return 1;
	} else if(my_hand == 'R' && rec_hand == 'S'){
		return 1;
	} else if(my_hand == rec_hand) {
		return 2;
	}
	return 0;
}



int main (void){
	/* Main function to play the game
	 * @param void
	 */

	//initialising all systems
	system_init ();
    navswitch_init ();
    ir_uart_init ();
	//defining variables in advance
	char PSR[3] = {'P','S','R'};
	char my_hand = PSR[0];
	char rec_hand;
	uint8_t score = 0;
	int i = 0;
	int sent_value = 0;
	int rec_value = 0;
    pacer_init (PACER_RATE);
	start_display();
    int game = 1;
    //main game loop
    while (1){
		while(game <= 3){
			pacer_wait ();
			tinygl_update ();
			navswitch_update ();
			//controls, scrolls between P,S,R
			if (navswitch_push_event_p (NAVSWITCH_EAST)){
				i += 1;
				if(i > 2){
					i = 0;
				}
			} else if (navswitch_push_event_p (NAVSWITCH_WEST)){
				i-=1;
				if(i < 0){
					i = 2;
				}
			}
			//selecting the hand
			my_hand = PSR[i];
			//need to add wait so that the sender will wait to receive before sending
			//as long as IR is ready this will run
			if (ir_uart_read_ready_p ()){
			   rec_hand = ir_uart_getc ();
			   rec_value = 1;
			}
			//once the navswtich has been pressed it will send
			if (navswitch_push_event_p (NAVSWITCH_PUSH)){
				ir_uart_putc(my_hand);
				sent_value = 1;
			}
			if(sent_value == 1 && rec_value == 1){
				uint8_t result = compare_hands(my_hand, rec_hand);
				if(result < 2){
					score += result;
					game += 1;
				}
				result_screen(result);
				sent_value = 0;
				rec_value = 0;
				my_hand = 'P';
			}
			show_hand(my_hand);
			tinygl_update ();
		}
    end_screen(score);
	}
}