/*
 * I have two essays to write. Each 5000 words with a tonne
 * of literature review required. The deadline is fast
 * approaching.
 * 
 * I can't start writing until I have some form of hardware
 * timer to let me know how long I've been working for. If 
 * this program were on twitter: #procrastination
 * 
 * LEDs count up 10 minute increments (in binary) reseting
 * at 60 minutes with an alarm tone.
 * 
 * Mark Ruff, April 2016
 */
 
// GLOBALS


// LED pins
int pin1 = 8;
int pin2 = 7;
int pin3 = 4;
int indicatorLed = 13; // so I know it's working
int resetSwitch = 2;
int speaker = 11;

// timing
unsigned long int timer = 0;
unsigned long int prevMillis = 0;
unsigned long int ledTime = 600000; // time to increment the LEDS = 10 mins
unsigned long int alarmTime = 3600000; // time to alarm and reset LEDS/counter

// notes for alarm
int alarmNoteCount = 3;
int alarmNotes[] = { 196, 196, 261 };
int alarmNoteLen[] { 500, 250, 2000 };

void setup() {
  // LED pins and speaker = output, reset switch = input
  pinMode(pin1,OUTPUT);
  pinMode(pin2,OUTPUT);
  pinMode(pin3,OUTPUT);
  pinMode(speaker,OUTPUT);
  pinMode(resetSwitch,INPUT);
  pinMode(indicatorLed,OUTPUT);
}

void loop() {
  // increment the timer
  timer += millis() - prevMillis;
  prevMillis = millis();

  if (digitalRead(resetSwitch) == HIGH) {
    // reset stuff
    digitalWrite(pin1, LOW);
    digitalWrite(pin2, LOW);
    digitalWrite(pin3, LOW);
    timer = 0;
    
    // need delay to get finger off the button
    delay(500);
  }

  if ( timer > alarmTime ) {
    // flash LEDs
    for ( int i = 0 ; i < 10 ; i++ ) {
      digitalWrite(pin1, HIGH);
      digitalWrite(pin2, HIGH);
      digitalWrite(pin3, HIGH);
      delay(200);
      digitalWrite(pin1, LOW);
      digitalWrite(pin2, LOW);
      digitalWrite(pin3, LOW);
      delay(100);
    }
    // play alarm
    for (int i = 0 ; i < alarmNoteCount ; i++ ) {
        tone(speaker, alarmNotes[i], alarmNoteLen[i]);
        delay(alarmNoteLen[i]);
    }
    // reset timer
    timer = 0;
  }

  // light up the LEDs for the time
  int timerConversion = timer / ledTime;
  if (timerConversion  == 1 || timerConversion  == 3 || timerConversion  == 5) {
    digitalWrite(pin1, HIGH);
  }
  else {
    digitalWrite(pin1, LOW); 
  }
  if (timerConversion  == 2 || timerConversion  == 3 || timerConversion  == 6) {
    digitalWrite(pin2, HIGH);
  }
  else {
    digitalWrite(pin2, LOW); 
  }
  if (timerConversion  > 3) {
    digitalWrite(pin3, HIGH);
  }
  else {
    digitalWrite(pin3, LOW); 
  }

  // give the poor little Arduino a rest
  delay(200);

  // let me know the thing is actually working (flash on/off every second)
  if ( (timer / 1000)%2 == 0 ) {
    digitalWrite(indicatorLed, HIGH);
  }
  else {
    digitalWrite(indicatorLed, LOW);
  }
}