/* REACTION TIME (with 2 leds) v2.1 beta
    Luis Andrés Gonzalez
   Reaction time original version from http://www.instructables.com/id/Arduino-Reaction-Time-Tester/?ALLSTEPS
   Send data to processing via the Serial Port original from By Elaine Laguerta http://url/of/online/tutorial.cc
*/
const int switchPin = 6;  // pin where the button will be connected
const int ledPin1 = 2 ;   // Left LED
const int ledPin2 = 8 ;   // Middle LED
const int ledPin3 = 12;   // Right LED

// declare some variables:
boolean lastButton = LOW;
boolean currentButton = LOW;
boolean gameStarted = false;  // true if game has started
boolean timerFlag = false;    // true if timer is running
long startTime;
long endTime;
int randomSeconds;
long beginTime;
float elapsedTime;
int maxTimer = 5 * 1000;
float totalTime;



void setup() {
  // Setup button and LEDs:
  pinMode(switchPin, INPUT);
  pinMode(ledPin1, OUTPUT);
  pinMode(ledPin2, OUTPUT);
  pinMode(ledPin3, OUTPUT);

  // Begin serial communication
  Serial.begin(9600);
}

void loop() {
  // Check https://www.arduino.cc/en/Tutorial/StateChangeDetection to understand the following code.
  if ((millis() - beginTime) > (randomSeconds + maxTimer) && gameStarted == true) {
    Stop();

    //resets game:
    gameStarted = false;
    timerFlag = false;
    currentButton = LOW;
    lastButton = LOW;


    Blink(2);
  }
  // read the pushbutton input pin in the current loop:
  currentButton = buttonPressed(lastButton);

  // if there's a change from low to high (comparing last and current loop) then the following is true
  if (currentButton == HIGH && lastButton == LOW) {   // outer IF

    if (gameStarted == false) {                       // middle IF. starts the game
      gameStarted = true;
      randomSeconds = random(2, 5) * 1000; // generates a random number of seconds between 3 and 8
      Blink(1);
      beginTime = millis();
    } else {

      if ((millis() - beginTime) >= randomSeconds) {
        Stop();
        gameStarted = false;
        timerFlag = false;

      } else if ((millis() - beginTime) < randomSeconds ) {
        gameStarted = false;
        timerFlag = false;
        Serial.println("1010"); // signal code for early response
        Blink(3);
        }

    }
  }                             // end outer if

  // save the current state as the last state,
  //for next time through the loop
  lastButton = currentButton;




  // If true, starts the response time timer and lights up the LED
  if (gameStarted == true && (millis() - beginTime) >= randomSeconds && timerFlag == false) {
    timerFlag = true;
    Serial.println("9090"); // signal code for start sound
    Start();

  }

} // end void loop

//===========================================================================================

boolean buttonPressed(boolean last) {       //button debouncing function
  boolean current = digitalRead(switchPin);
  if (last != current) {
    delay(5);
    current = digitalRead(switchPin);
  }
  return current;
}

void Start() {

  startTime = millis();
  Light(ledPin1, "on");

}

void Stop() {
  if ( (millis() - beginTime) <= maxTimer ) {
    endTime = millis();
    elapsedTime = (endTime - startTime);
    float elapsedSeconds = elapsedTime / 1000.0;
    Serial.println(elapsedSeconds);
  }
  else Serial.println("Timed out");
  Light(ledPin1, "off");

}

void Blink(int repetitions) {
  for (int i = 0; i < repetitions; i++) {
    digitalWrite(ledPin2, HIGH);
    delay(100);
    digitalWrite(ledPin2, LOW);
    delay(100);
  }
}

void Light(int lednumber, String onOff) {
  if (onOff == "on") {
    digitalWrite(lednumber, HIGH);
  } else if (onOff == "off") {
    digitalWrite(lednumber, LOW);
  }

}