#include <Adafruit_NeoPixel.h>
#include <SPI.h>
#include <SD.h>
#include <TMRpcm.h>
#include <SoftwareSerial.h>

#define SENSOR A1 // senzorul de sunet
#define LED_PIN 6 // input-ul inelului de led-uri
#define BUTTON 2 // butonul on/off
#define SS 10
#define SD_ChipSelectPin 4
#define SPEAKER 9

#define LED_COUNT 24
#define LED_DELAY 10 // intervalul dupa care isi schimba culoarea fiecare led
#define CRYING_WAIT_TIME 5000 // 5 secunde
#define CRYING_THRESHOLD 10 // nr de citiri > 200 in 5 secunde necesare pt a porni jucaria
#define CRYING_INTENSITY 200 // intensitatea minima a sunetului
#define DEBOUNCE_TIME 500

SoftwareSerial mySerial(1, 0); // RX, TX pentru bluetooth
Adafruit_NeoPixel strip(LED_COUNT, LED_PIN, NEO_GRB + NEO_KHZ800); // inelul de led-uri
TMRpcm tmrpcm; // obiect folosit pt redarea muzicii
unsigned long ledInterval;
long firstPixelHue;
unsigned long soundCount; // nr de citiri > 200 in 5 secunde
unsigned long cryingTime;
volatile bool onOff;
bool crying;
volatile unsigned long lastInterrupt;

void setup() {
  pinMode(SENSOR, INPUT);
  pinMode(BUTTON, INPUT_PULLUP);
  pinMode(SS, OUTPUT);
  pinMode(SPEAKER, OUTPUT);

  onOff = 0;
  crying = 0;

  strip.begin();
  strip.show();
  strip.setBrightness(10);

  ledInterval = millis();
  firstPixelHue = 0;

  Serial.begin(9600);
  mySerial.begin(9600);

  soundCount = 0;
  cryingTime = millis();

  lastInterrupt = 0;
  attachInterrupt(digitalPinToInterrupt(BUTTON), isr, RISING); // intrerupere la apasarea butonului

  if (!SD.begin(SD_ChipSelectPin)) {
    Serial.println("SD fail");
    return;
  } else {   
    Serial.println("SD ok");   
  }
  tmrpcm.speakerPin = SPEAKER;
  tmrpcm.quality(1);
  tmrpcm.setVolume(6);
}


void loop() {
  if (onOff == 1) {
    // LED-urile
    if (millis() - ledInterval >= LED_DELAY) {
      ledInterval = millis();

      for(int i = 0; i < LED_COUNT; i++) {
        if (crying == 1) {
          // Daca bebelusul plange, se aprind led-urile
          int pixelHue = firstPixelHue + (i * 65536L / LED_COUNT);
          strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue)));
        } else {
          // primul led este verde pentru a semnala functionarea dispozitivului
          if (i == 0) {
            strip.setPixelColor(0, 0, 255, 0);
          } else {
            // celelalte led-uri sunt stinse
            strip.setPixelColor(i, 0, 0, 0);
          }
        }
      }
      strip.show();

      firstPixelHue += 256;
      if (firstPixelHue >= 5*65536) {
        firstPixelHue = 0;
      }
    }
  
    // senzorul de sunet
    if (crying == 0) {
      int soundLevel = analogRead(SENSOR);
      if (soundLevel >= CRYING_INTENSITY) {
        soundCount++;
      }

      // Se verifica daca au trecut cele 5 secunde
      if (millis() - cryingTime >= CRYING_WAIT_TIME) {
        if (soundCount >= CRYING_THRESHOLD) { // nr citirilor senzorului
          // Jucaria porneste
          crying = 1;

          // se initializeaza variabilele necesare led-urilor
          ledInterval = millis();
          firstPixelHue = 0;

          // porneste muzica
          tmrpcm.play("song.wav", 15);

          // se trimite notificare
          Serial.println("Your baby is crying!");
        }

        cryingTime = millis();
        soundCount = 0;
      }
    }
  } else {
    crying = 0;
    ledInterval = millis();
    firstPixelHue = 0;
    soundCount = 0;
    cryingTime = millis();

    // se opreste muzica
    tmrpcm.stopPlayback();

    // led-urile sunt stinse
    for(int i = 0; i < LED_COUNT; i++)
      strip.setPixelColor(i, 0, 0, 0);
    strip.show();
  }
}

void isr() {
  // debounce pt buton
  if (millis() - lastInterrupt >= DEBOUNCE_TIME) {
    lastInterrupt = millis();
    onOff = !onOff;
  }
}