int LightSensor = A3;
int leds = D5;
int StartButton = A0;
int emergencyOff = A1;
const int speakerPin = D2;


int Alarming = 0;
int lightThresh = 150;
int timeElapsed = 0;
int lightReading = 0;


//nunber of notes and rests
const int songLength = 18;

//list of tones and rests
char notes[] = "cdfda ag cdfdg gf "; // a space represents a rest

//duration of the notes
int beats[] = {1,1,1,1,1,1,4,4,2,1,1,1,1,1,1,4,4,2};

//tempo of the song
int tempo = 150;


void setup()
{
  pinMode(speakerPin, OUTPUT);
  pinMode(LightSensor,INPUT);
  pinMode(leds,OUTPUT);
  pinMode(StartButton,INPUT);
  pinMode(emergencyOff,INPUT);

  digitalWrite(leds,LOW);
  // We only want to play the song once, so we'll put it in the setup loop

  //If you want your song to loop forever, place that code in the loop() below.
}


void loop()
{

  if (analogRead(StartButton) >= 3000){
     Alarming = 1;
     //can be set to any amount of time to accommodate a sleep goal
     delay(8000);
   }

  if (analogRead(emergencyOff) >= 3000){
     Alarming = 0;
     digitalWrite(leds, LOW);
   }



//Turning the alarm off with the light sensor
lightReading = analogRead(LightSensor);

   if (lightReading < lightThresh){
     timeElapsed = 0;
   }else{
     if (timeElapsed == 0){
         timeElapsed = millis();
     }
     if (timeElapsed + 2000 < millis() ){
         Alarming = 0;
     }
   }

Particle.variable("light", &lightReading, INT);

//The alarm sequence.  Lights flash and the audio alarm goes off
if (Alarming){
  int i, duration;


delay(500);


  for (i = 0; i < songLength; i++) // step through the song arrays
  {
    duration = beats[i] * tempo;  // length of note/rest in ms

    if (notes[i] == ' ')          // is this a rest?
    {
      delay(duration);            // then pause for a moment
    }
    else                          // otherwise, play the note
    {
      digitalWrite(leds, HIGH);
      tone(speakerPin, frequency(notes[i]), duration);
      delay(duration);            // wait for tone to finish
      digitalWrite(leds, LOW);
    }
    delay(tempo/10);              // brief pause between notes
  }


}
}


int frequency(char note)
{
  // This function takes a note character (a-g), and returns the
  // corresponding frequency in Hz for the tone() function.

  int i;
  const int numNotes = 8;  // number of notes we're storing

  // The following arrays hold the note characters and their
  // corresponding frequencies. The last "C" note is uppercase
  // to separate it from the first lowercase "c". If you want to
  // add more notes, you'll need to use unique characters.

  // For the "char" (character) type, we put single characters
  // in single quotes.

  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523};

  // Now we'll search through the letters in the array, and if
  // we find it, we'll return the frequency for that note.

  for (i = 0; i < numNotes; i++)  // Step through the notes
  {
    if (names[i] == note)         // Is this the one?
    {
      return(frequencies[i]);     // Yes! Return the frequency
    }
  }
  return(0);  // We looked through everything and didn't find it,
              // but we still need to return a value, so return 0.
}