/* 
 Code to 
 
 Prof Mike Soltys
 University of Colorado
 1/28/2014
 */


// Define the button, LED, and buzzer pins (this is standard for all Simon Says games
// I've labeled mine UL for Upper Left, LR for Lower Left and so on. 
const int led_UL = 10; //Red
const int led_UR = 3; //Green
const int led_LL = 13; //Blue
const int led_LR = 5; //Yellow

const int but_UL = 9;
const int but_UR = 2;
const int but_LL = 12;
const int but_LR = 6;

const int BUZZER1 = 4;
const int BUZZER2 = 7;

// We'll set up variables for each button, so Upper Left is Button 1,
// Upper right is 2, etc.
const int UL = 1;
const int UR = 2;
const int LL = 3;
const int LR = 4;

void setup() {
  //Setup hardware inputs/outputs. 
  //Enable pull ups on inputs
  pinMode(but_UL, INPUT_PULLUP);
  pinMode(but_UR, INPUT_PULLUP);
  pinMode(but_LL, INPUT_PULLUP);
  pinMode(but_LR, INPUT_PULLUP);

  pinMode(led_UL, OUTPUT);
  pinMode(led_UR, OUTPUT);
  pinMode(led_LL, OUTPUT);
  pinMode(led_LR, OUTPUT);

  pinMode(BUZZER1, OUTPUT);
  pinMode(BUZZER2, OUTPUT);
}

// keep doing this over and over again.
void loop() {
  // this calls the bit of code ButtonWait() which is found below
  // the code waits untill a button is pressed, and then tells you which button was pressed
  // (1, 2, 3, 4)
  int Button = ButtonWait();

  // check to see if the button was the first one in our sequence (Upper Left)
  if (Button == UL){
    // if so, turn on the upper left button
    digitalWrite(led_UL, HIGH);
    // and wait for another button to be pressed
    Button = ButtonWait();
    // now check to see if the second button (UR) in our sequence was pressed
    if (Button == UR){
      // if so, turn that button on and continue
      digitalWrite(led_UR, HIGH);  
      // play success tone!
      tone(BUZZER1,399,1000);
      // interesting fact: 399 Hz is the "most plesant" frequency
      // http://www.ncbi.nlm.nih.gov/pubmed/503755

      // if at any point a wrong button is pressed, the code will jump down
      // to delay 1000, turn off the LEDs, and restart at the top of void loop()
    }
    // if the wrong button is pressed, play an unplesant sound
    else {
      tone(BUZZER1,2000,500);
    }
  }
  // if the wrong button is pressed, play an unplesant sound
  else {
    tone(BUZZER1,2000,500);
  }
  
  // wait a second and turn off all LEDS
  delay(1000);
  digitalWrite(led_UR, LOW);
  digitalWrite(led_UL, LOW);
  digitalWrite(led_LL, LOW);  
  digitalWrite(led_LR, LOW);     
}

// Waits for a button to be pressed, then returns 1-4 to tell what button it was.
int ButtonWait(void){
  // this is always true, so this loop will keep going until it reaches a "return" command  
  while(1 == 1){
    // Check if the UL button is pressed
    if(digitalRead(but_UL) == 0){
      //wait till the user releases the button
      while (digitalRead(but_UL) == 0){
        delay(10);
      }
      // return what button was pressed
      return(UL);
    }
    // Check if the UR button is pressed
    else if(digitalRead(but_UR) == 0){
      //wait till the user releases the button
      while (digitalRead(but_UR) == 0){
        delay(10);
      }
      // return what button was pressed
      return(UR);
    }
    // and so on.    
    else if(digitalRead(but_LL) == 0){
      while (digitalRead(but_LL) == 0){ 
        delay(10);
      }
      return(LL);
    }  
    else if(digitalRead(but_LR) == 0){
      while (digitalRead(but_LR) == 0){ 
        delay(10);
      }
      return(LR);
    }
    // if we get here, nothing has been pressed, and so we'll restart at the top of
    // the loop while (1==1).  
  }
}