#include <Wire.h>
#include <RTClib.h>
#include "SSD1306Wire.h"
#include <ESP8266WiFi.h>
#include <SoftwareSerial.h>
#include <FirebaseESP8266.h>
#include <addons/RTDBHelper.h>
#include <addons/TokenHelper.h>

#include <OneWire.h>
#include <DallasTemperature.h>
#define onewirepin D6

OneWire oneWire(onewirepin);
DallasTemperature sensors(&oneWire);
DeviceAddress Probe = { 0x28, 0x2F, 0xE1, 0x49, 0xF6, 0x1F, 0x3C, 0x5D };
//////////////////////////////////////////////////////////////////////
#define WIFI_SSID "network"
#define WIFI_PASSWORD "123456789"
#define API_KEY "AIzaSyCz8k4yj9UiMvfkO6sP66cEIKdyWJLBbJQ"
#define DATABASE_URL "smartwatch-37f35-default-rtdb.firebaseio.com"
#define USER_EMAIL "project9686firebase@gmail.com"
#define USER_PASSWORD "123456789"
/////////////////////////////////////////////////////////////////////

FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;
unsigned long sendDataPrevMillis = 0;


#define RX D1
#define TX D3
RTC_DS3231 rtc;
SoftwareSerial ss(RX, TX);
SSD1306Wire display(0x3C, D2, D5);
String timee;
String dayyy;
const int MPU = 0x69;//0x69 [with jumper]
int16_t Tmp, GyX, GyY, GyZ;
char c;
String dataIn;
int8_t indexOfA, indexOfB;
String data1, data2;
float tempC;

void setup() {
  Serial.begin(9600);
  ss.begin(9600);
  sensors.begin (); // Initialize the sensor and set resolution level
  sensors.setResolution(Probe, 10);

  initOLED();
  initRTC();
  initGyro();

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to Wi-Fi");
  while (WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(300);
  }
  Serial.println();
  Serial.print("Connected with IP: ");
  Serial.println(WiFi.localIP());
  Serial.println();

  Serial.printf("Firebase Client v%s\n\n", FIREBASE_CLIENT_VERSION);

  /* Assign the api key (required) */
  config.api_key = API_KEY;

  /* Assign the user sign in credentials */
  auth.user.email = USER_EMAIL;
  auth.user.password = USER_PASSWORD;

  /* Assign the RTDB URL (required) */
  config.database_url = DATABASE_URL;

  /* Assign the callback function for the long running token generation task */
  config.token_status_callback = tokenStatusCallback; //see addons/TokenHelper.h

  //Or use legacy authenticate method
  //config.database_url = DATABASE_URL;
  //config.signer.tokens.legacy_token = "<database secret>";

  Firebase.begin(&config, &auth);

  Firebase.reconnectWiFi(true);
#if defined(ESP8266)
  fbdo.setBSSLBufferSize(512, 2048);
#endif
}

void loop() {
  getTimeAndDate();
  Gyroscope();

  sensors.requestTemperatures(); // Command all devices on bus to read temperature

  Serial.print("Temperature is: ");
  printTemperature(Probe);
  Serial.println();

  while (ss.available() > 0) {
    c = ss.read();
    if (c == '\n') {
      break;
    }
    else       {
      dataIn += c;
    }
  }
  if (c == '\n') {
    parseData();
    ShowRxData();
    if (Firebase.ready() && (millis() - sendDataPrevMillis > 1000 || sendDataPrevMillis == 0))
    {
      sendDataPrevMillis = millis();

      Serial.print("Set String... ");
      Firebase.setString(fbdo, "/HR", data1);
      Firebase.setString(fbdo, "/O2", data2);
      Firebase.setString(fbdo, "/Temp", String(tempC));
      //Firebase.setIntAsync(fbdo, "/Distance", count);
      Serial.println("ok");
    }
    if (  GyY > -500 && GyY < 500 ) {
      ShowOLED();
    }
    else {
      display.clear();
      display.display();
    }

    resetData();
  }
}

void parseData() {
  indexOfA = dataIn.indexOf("A");
  indexOfB = dataIn.indexOf("B");
  data1 = dataIn.substring(0, indexOfA);
  data2 = dataIn.substring(indexOfA + 1, indexOfB);
}

void ShowRxData() {
  Serial.println("HR: " + data1);
  Serial.println("O2: " + data2);
  Serial.println("####################");
}

void resetData() {
  c = 0;
  dataIn = "";
}

void ShowOLED() {
  display.clear();
  display.setFont(ArialMT_Plain_10);//Size: 10 / 16 / 24
  display.setTextAlignment(TEXT_ALIGN_CENTER);
  display.drawString(64, 0,  String("HR: " + data1));
  display.drawString(64, 13, String("O2: " + data2 + "%"));
  display.drawString(64, 26, String(timee));
  display.drawString(64, 38, String(dayyy));
  display.drawString(64, 50, String(tempC));
  display.display();
  delay(10);
}

void Gyroscope() {
  Wire.beginTransmission(MPU);
  Wire.write(0x3B);
  Wire.endTransmission(false);
  Wire.requestFrom(MPU, 12, true);
  GyX = Wire.read() << 8 | Wire.read();
  GyY = Wire.read() << 8 | Wire.read();
  GyZ = Wire.read() << 8 | Wire.read();
  Serial.print("Gyroscope: ");
  Serial.print("X = "); Serial.print(GyX);
  Serial.print(" | Y = "); Serial.print(GyY);
  Serial.print(" | Z = "); Serial.println(GyZ);
  Serial.println(" ");
  delay(333);
}




void initOLED() {
  display.init();
  display.flipScreenVertically();
  display.setFont(ArialMT_Plain_10);
}

void initRTC() {
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    while (1) delay(10);
  }

  if (rtc.lostPower()) {
    Serial.println("RTC lost power, let's set the time!");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    //rtc.adjust(DateTime(2022, 8, 6, 18, 58, 0));
  }
}

void initGyro() {
  Wire.begin();
  Wire.beginTransmission(MPU);
  Wire.write(0x6B);
  Wire.write(0);
  Wire.endTransmission(true);

}

void getTimeAndDate() {
  DateTime now = rtc.now();
  timee = "";
  timee += now.hour();
  timee += ':';
  timee += now.minute();
  timee += ':';
  timee += now.second();
  dayyy = "";
  dayyy += (now.year());
  dayyy += '/';
  dayyy += (now.month());
  dayyy += '/';
  dayyy += (now.day());
}



void printTemperature(DeviceAddress deviceAddress)
{

  tempC = sensors.getTempC(deviceAddress);

  if (tempC == -127.00)
  {
    Serial.print ("Error getting temperature");
  }
  else
  {
    Serial.print ("C: ");
    Serial.println (tempC);
  }
}