Shivani Kannan - Ambient Orb

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

// Include Particle Device OS APIs
#include "Particle.h"
#define PIXEL_PIN SPI
#define PIXEL_COUNT 8
#define PIXEL_TYPE WS2812

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

SerialLogHandler logHandler(LOG_LEVEL_INFO);

bool fadeToRed = false;          // Flag to start the fade
bool fadeToWhite = false;        // Flag to fade back to white
unsigned long fadeStartTime = 0; // Time when the fade starts
const unsigned long fadeDuration = 30000; // 30 seconds in milliseconds

// Function to set initial cool white color
void displayCoolWhite() {
    for (int i = 0; i < strip.numPixels(); i++) {
        strip.setPixelColor(i, 200, 200, 255); // Cool white RGB values
    }
    strip.show();
}

// Particle Cloud function to start fading to red
int startFadeToRed(String command) {
    fadeToRed = true;              // Set flag to start fading to red
    fadeToWhite = false;           // Ensure the fade back to white is off
    fadeStartTime = millis();      // Record start time of fade
    return 1;
}

    void setup() {
        strip.begin();
        displayCoolWhite();              // Display cool white on startup
        Particle.function("fadeToRed", startFadeToRed); // Register Particle Cloud function
}

void loop() {
    if (fadeToRed) {
        // Calculate elapsed time since fade started
        unsigned long elapsed = millis() - fadeStartTime;

        if (elapsed >= fadeDuration) {
            // Fade to red is complete, set color to solid red and start fading back to white
            for (int i = 0; i < strip.numPixels(); i++) {
                strip.setPixelColor(i, 255, 0, 0); // Solid red color
            }
            strip.show();
            fadeToRed = false;          // Stop fading to red
            fadeToWhite = true;         // Start fading back to white
            fadeStartTime = millis();   // Reset fade start time for the next fade
        } else {
            // Calculate intermediate color values based on elapsed time
            float progress = (float)elapsed / fadeDuration;
            int redValue = (int)(200 + progress * (255 - 200));
            int greenValue = (int)(200 - progress * 200);
            int blueValue = (int)(255 - progress * 255);

            for (int i = 0; i < strip.numPixels(); i++) {
                strip.setPixelColor(i, redValue, greenValue, blueValue);
            }
            strip.show();
        }
    } else if (fadeToWhite) {
        // Calculate elapsed time since fade back to white started
        unsigned long elapsed = millis() - fadeStartTime;

        if (elapsed >= fadeDuration) {
            // Fade back to white is complete, set color to solid cool white
            displayCoolWhite();
            fadeToWhite = false; // Stop fading
        } else {
            // Calculate intermediate color values for fade back to white
            float progress = (float)elapsed / fadeDuration;
            int redValue = (int)(255 - progress * (255 - 200));
            int greenValue = (int)(0 + progress * 200);
            int blueValue = (int)(0 + progress * 255);

            for (int i = 0; i < strip.numPixels(); i++) {
                strip.setPixelColor(i, redValue, greenValue, blueValue);
            }
            strip.show();
        }
    }
}