// This #include statement was automatically added by the Particle IDE.
#include <neopixel.h>
#define PIXEL_PIN D2
#define PIXEL_COUNT 16
#define PIXEL_TYPE WS2812

Adafruit_NeoPixel strip = Adafruit_NeoPixel(PIXEL_COUNT, PIXEL_PIN, PIXEL_TYPE);
int r = 0;
int b = 0;
int g = 0;
long lastPublishedAt = 0;
int publishAfter = 100; //the initial delay
bool blueOn = false; //color for Lily = blue

void setup() {
    strip.begin();
    Particle.subscribe("diot2021blossomneopixel" , handleSharedEvent);

}

void loop() {
    // strip.show(); neopixel strip is off in the beginning
    uint16_t i;
    uint32_t c = strip.Color(0, 0, 255); // color Blue
    publishPixelon();
    if (blueOn == true){
        for( int i = 0; i < strip.numPixels(); i++ ){
            strip.setPixelColor(i, c); // each pixel turning on blue one by one
            strip.show();
            delay( 200 );
        }
        for ( int i = 15; i > 0; i-- ){
            strip.setPixelColor(i, c); // each pixel turning off one by one
            strip.show();
            delay( 200 );
        }
        
        blueOn = false;
    }    
    delay (100);
}

void publishPixelon(){
    if ( lastPublishedAt + publishAfter < millis() ){
        String pixelOn = "diot2021blossomneopixel";
        if(blueOn == false){
            Particle.publish(pixelOn);
        }
        lastPublishedAt = millis();
    }
}


void handleSharedEvent(const char *event, const char *data){
    String pixelOn = String(event); // this is reading the function as per particle.publish, convert to a string object first
    String deviceID = System.deviceID();
    // device id = 
    // event being triggered = "diot2021blossomneopixel"
    if( pixelOn.indexOf( deviceID) != -1 ){
        return;
    }
    else{
        blueOn = true;
    }
}