// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>

//Set pixel COUNT, PIN, and TYPE 
#define PIXEL_COUNT 8
#define PIXEL_PIN D2
#define PIXEL_TYPE WS2812

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);

int red = 25;          
int green = 25;        
int blue = 25;         

int durationOfFade = 1000 * 60 * 15;        //15 minutes 
bool calendarAlert = false;                 //checkpoint for calendar alert
unsigned long lastUpdate;                   
unsigned long now = 0;                      

uint16_t i;
uint32_t cRed = strip.Color(25, 0, 0);
uint32_t cGreen = strip.Color(0, 25, 0);
uint32_t cBlue = strip.Color(0, 0, 25);
uint32_t cWhite = strip.Color(25, 25, 25);

void setup() { 

  strip.begin();
  strip.show(); 
  
  Particle.function("blue", blueControl);
  Particle.function("red", redControl);
  Particle.function("green", greenControl);
  
  Particle.function("meetingAlert", meetingAlert);
    
    for (i=0; i<strip.numPixels(); i++) {
        strip.setPixelColor(i,cWhite);
        strip.show();
    }
}

void loop() {
    
    if (calendarAlert == true) {
        now = millis();
        long timeElapsed = now - lastUpdate;
        
        if (timeElapsed <= durationOfFade) {
            
            int colorValue = map(timeElapsed, 0, durationOfFade, 0, 255);
            
            int r = colorValue;
            int g = 0;
            int b = 0;
            
            for (i=0; i<strip.numPixels(); i++){
                strip.setPixelColor(i,r,g,b);
            }
            strip.show();
        }
        else {
            calendarAlert = false; 
            Particle.publish("MeetingStarted-FadingToWhite");    
        }
    }
    else {
        now = millis();
        long timeElapsed = now - lastUpdate;
        
        if ((timeElapsed >= durationOfFade) && (timeElapsed <= 2*durationOfFade)) {
            
            int colorValue = map(timeElapsed, 0, 2*durationOfFade, 0, 255);
            
            int r = colorValue;
            int g = colorValue;
            int b = colorValue;
            
            if (r>25) {
                for (i=0; i<strip.numPixels(); i++) {
                   strip.setPixelColor(i,(255-r),g,b);
                }
                strip.show();
            }
        }
    }
}

//IFTTT function
int meetingAlert(String command) {
    
    if(command == "True") {
        calendarAlert = true;
        lastUpdate = millis();
        Particle.publish("MeetingStarting-FadingToRed");      
        return 1;
    }
    return -1;
}

int blueControl(String command) {

    for(i=0; i< strip.numPixels(); i++) {
    strip.setPixelColor(i, cBlue);
		strip.show();
		delay( 0 );
    }
  return 1;
}

int redControl(String command) {
    
    for(i=0; i< strip.numPixels(); i++) {
    strip.setPixelColor(i, cRed);
		strip.show();
		delay( 0 );
    }
  return 1;
}

int greenControl(String command) {
    
    for(i=0; i< strip.numPixels(); i++) {
    strip.setPixelColor(i, cGreen);
		strip.show();
		delay( 0 );
    }
  return 1;
}