#include "PietteTech_DHT.h"  // Uncomment if building in IDE

// system defines
#define DHTTYPE DHT22              // Sensor type DHT11/21/22/AM2301/AM2302
#define DHTPIN D4         	    // Digital pin for communications
#define DHT_SAMPLE_INTERVAL 2000 // Sample every two seconds

int ledPin1 = D2;
int ledPin2 = D0;
int buzzer = D3;
int buttonPin = D1;

bool isMediating = false;
long mediationStartTime = -1;

double temperature;
double humidity;
int tempReading;

// globals
unsigned int DHTnextSampleTime;	    // Next time we want to start sample
bool bDHTstarted;		    // flag to indicate we started acquisition
int n;                              // counter

void dht_wrapper(); // must be declared before the lib initialization

PietteTech_DHT DHT(DHTPIN, DHTTYPE, dht_wrapper);

void dht_wrapper() {
  DHT.isrCallback();
}

void setup()
{
  interrupts(); // added to make recognize DHT library
  pinMode( buttonPin , INPUT_PULLUP); // sets pin as input
  pinMode( ledPin1 , OUTPUT ); // sets pin as output
  pinMode( ledPin2 , OUTPUT );
  pinMode(buzzer, OUTPUT);
  digitalWrite( ledPin1, LOW);
  digitalWrite(ledPin2, LOW);

  //tone(buzzer, 1000, 500);

  // temperature sensor setup
  WiFi.on();
  Particle.connect();
  // Variables Exposed to Cloud
  Particle.variable("temperature", temperature);
  Particle.publish("message: ", "I am meditating!");
  Serial.begin(9600);
  DHTnextSampleTime = 0;  // Start the first sample immediately

}

void loop()
{
// find out if the button is pushed or not by reading from it.
   int buttonState = digitalRead( buttonPin );

   // switch LED color to signify timer starting
  if( isMediating == false && buttonState == LOW )
  {
    // read temp of dht and display
    tempReading = analogRead(DHTPIN);
    // blink blue LED to signify starting timer
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin1, HIGH);
    delay(500);
    digitalWrite(ledPin1, LOW);
    delay(500);
    digitalWrite(ledPin1,HIGH);
    delay(500);
    digitalWrite(ledPin1,LOW);
    // get temperature, publish temperature and I am meditating string
    Particle.variable("temperature", temperature);
    temperature = DHT.getCelsius();
    Serial.printlnf("Humidity\t: %.2f %%", humidity);
    Serial.printlnf("Temperature\t: %.2f °C", temperature);
    Particle.publish("Temperature", String(temperature) + " °C");
    Particle.publish("message: ", "I am meditating");

    // start the mediation cycle...
    isMediating = true;
    // keep a track of when we started meditating
    mediationStartTime = millis();
  }else{
    // otherwise turn white led on during meditation session
    digitalWrite( ledPin2, HIGH);

  }

// signal buzzer and flash blue light to signify end of meditation session (10 minutes is up)
  if( isMediating == true and mediationStartTime + 600000 < millis() ) {
    tone(buzzer, 1000, 500);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin1, HIGH);
    delay(500);
    digitalWrite(ledPin1, LOW);
    delay(500);
    digitalWrite(ledPin1,HIGH);
    delay(500);
    digitalWrite(ledPin1,LOW);

    // update the start
    isMediating = false;
    mediationStartTime = -1;
  }
  // turn off both lights
  if ( isMediating == false ) {
    digitalWrite(ledPin1,LOW);
    digitalWrite(ledPin2, LOW);
  }
  // anything less than 10 minutes, white light is on
  else {
    digitalWrite(ledPin2, HIGH);
  }

	}