// Library to control NeoPixel LED ring.
#include <Adafruit_NeoPixel.h>
// Library to control the infrared (IR) remote.
#include <IRremote.h>

// Defines pins and LED settings.
// Pin for LED ring.
#define PIN 6
// Number of LEDs in the ring.
#define LED_COUNT 16
// The ring's brightness level.
#define BRIGHTNESS 250
// Pin connected to infrared (IR) receiver.
#define PIN_RECEIVER 2
// Pin connected to the buzzer.
#define BUZZER_PIN 8

// Note: The buzzer represents sound outputs that would come from a speaker through Bluetooth.
// Note: The RGB LED simulates and substitutes the circuitry of an HC-05 Bluetooth module.
// Note: The IR remote substitutes a phone, representing the buttons within an application that are tapped to change mood.
// Thanks to user arcostasi for setup of the IR remote, and the logic in the loop method.
// Thanks to Mauro Alfieri for code on Neopixel initialisation, and the set_color method.
// Thanks to the diagram reference in Wokwi Docs for assisting with pin connections and the remote commands.

// Initialises the NeoPixel ring's LED count, pin, and colour formatting.
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(LED_COUNT, PIN, NEO_GRB + NEO_KHZ800);

void setup() {
  // Starts serial communication and hardware.
  // Serial commmunication for debugging.
  Serial.begin(9600);
  // Begins the IR receiver.
  IrReceiver.begin(PIN_RECEIVER, ENABLE_LED_FEEDBACK);
  // Prepares the NeoPixel ring for use.
  pixels.begin();
  // Sets brightness of LEDs.
  pixels.setBrightness(BRIGHTNESS);
  // Ensures that LEDs start as off.
  pixels.show();
  // Sets buzzer pin as the sound output.
  pinMode(BUZZER_PIN, OUTPUT);

  // Flashes LED ring white and off to indicate setup completion.
  for (int i = 0; i < 6; i++) {
    // Sets LEDs to white.
    set_color(pixels.Color(255, 255, 255));
    // 250 millisecond wait.
    delay(250);
    // Turns LEDs off.
    set_color(pixels.Color(0, 0, 0));
    // 250 milliseocond wait.
    delay(250);
  }
}

void set_color(uint32_t color) {
  // Loops through every LED.
  for (int i = 0; i < LED_COUNT; i++) {
    // Sets the colour for the current LED.
    pixels.setPixelColor(i, color);
  }
  // Applies the colour change to all LEDs.
  pixels.show();
}

void loop() {
  // CHeck if an IR signal is received.
  if (IrReceiver.decode()) {
    // Store the button value received.
    int button_value = IrReceiver.decodedIRData.command;

    // Matches button value to a case.
    switch (button_value) {
      // IR code for rebellious music button.
      case 48:
        // Displays message in serial monitor.
        Serial.println("Playing Rebellious Music.");
        // Sets LEDs to red.
        set_color(pixels.Color(255, 0, 0));
        // Buzzer on.
        digitalWrite(BUZZER_PIN, HIGH);
        // Wait for half a second.
        delay(500);
        // Buzzer off
        digitalWrite(BUZZER_PIN, LOW);
        // Wait for half a second.
        delay(500);
        break;  // IR code for happy music.
      case 24:
        // Sets LEDs to yellow.
        set_color(pixels.Color(255, 255, 0));
        Serial.println("Playing Happy Music.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(300);
        digitalWrite(BUZZER_PIN, LOW);
        delay(200);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(300);
        digitalWrite(BUZZER_PIN, LOW);
        break;

      // IR code for sad music.
      case 122:
        // Sets LEDs to blue.
        set_color(pixels.Color(0, 0, 255));
        Serial.println("Playing Sad Music.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(1000);
        digitalWrite(BUZZER_PIN, LOW);
        delay(1000);
        break;

      // IR code for nature sounds.
      case 16:
        // Sets LEDs to green.
        set_color(pixels.Color(0, 255, 0));
        Serial.println("Playing Nature Sounds.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(200);
        digitalWrite(BUZZER_PIN, LOW);
        delay(300);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(200);
        digitalWrite(BUZZER_PIN, LOW);
        break;

      // IR code for exciting EDM.
      case 56:
        // Sets LEDs to orange.
        set_color(pixels.Color(255, 165, 0));
        Serial.println("Playing Exciting EDM.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(100);
        digitalWrite(BUZZER_PIN, LOW);
        delay(100);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(100);
        digitalWrite(BUZZER_PIN, LOW);
        break;

      // IR code for romantic music.
      case 90:
        // Sets LEDs to pink.
        set_color(pixels.Color(255, 105, 180));
        Serial.println("Playing Romantic Music.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(700);
        digitalWrite(BUZZER_PIN, LOW);
        delay(300);
        break;

      // IR code for hopeful music.
      case 66:
        // Sets LEDs to white.
        set_color(pixels.Color(255, 255, 255));
        Serial.println("Playing Hopeful Music.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(400);
        digitalWrite(BUZZER_PIN, LOW);
        delay(400);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(600);
        digitalWrite(BUZZER_PIN, LOW);
        break;

      // IR code for eerie music.
      case 74:
        // Sets LEDs to purple.
        set_color(pixels.Color(128, 0, 128));
        Serial.println("Playing Eerie Music.");
        digitalWrite(BUZZER_PIN, HIGH);
        delay(200);
        digitalWrite(BUZZER_PIN, LOW);
        delay(100);
        digitalWrite(BUZZER_PIN, HIGH);
        delay(200);
        digitalWrite(BUZZER_PIN, LOW);
        break;

      // Responds to any other unrecognised button press.
      default:
        Serial.println("Other button pressed.");
        break;
    }
  // Resumes IR receiver to get the next signal.
      IrReceiver.resume();
  }
}