#include <WiFi.h>
#include<Firebase_ESP_Client.h>
#include "addons/TokenHelper.h"
#include "addons/RTDBHelper.h"

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
#define API_KEY "AIzaSyD9wbqNYYUNnS4gTBz-ZDLfhEeANegayPU"
#define DATABASE_URL "https://esp32--firebase-project-default-rtdb.asia-southeast1.firebasedatabase.app/"

#define LED1_PIN 12
#define LED2_PIN 14
#define LDR_PIN 36

FirebaseData fbdo;
FirebaseAuth auth;
FirebaseConfig config;

unsigned long sendDataPrevMillis=0;     //so we can write real time interval in an unblocking way
bool signupOK=false;
int ldrData=0;                          // to store 12 bit ADC data from 0 to 4095
float voltage=0.0;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  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();

  config.api_key=API_KEY;
  config.database_url= DATABASE_URL;
  if(Firebase.signUp(&config , &auth, "","")){ // last two arguments are empty , this denotes an anonymous user signup.
    Serial.println("signUp OK");               // every time a the esp32 connects it creates a new anonymous user.
    signupOK=true;                             // if signup is successfull change it to true
}
else{
  Serial.printf("%s\n",config.signer.signupError.message.c_str());
}

config.token_status_callback=tokenStatusCallback;
Firebase.reconnectWiFi(true);
}
void loop() {
  if(Firebase.ready() && signupOK && (millis() - sendDataPrevMillis>5000 || sendDataPrevMillis == 0)){
    sendDataPrevMillis=millis();      // we have to assign PrevMillis every time it exceeds 5000 millisecond mark to start if condition
  // -------------STORE sensor data to a RTDB(real time data base)
  ldrData=analogRead(LDR_PIN);
  voltage=(float)analogReadMilliVolts(LDR_PIN)/1000;   // to convert millivolts to volts
     //we have different types of functions which returns bool value indicating success-  set,setInt,setFloat,setDouble,setString,setFile etc. // this is how we store data in realtime database
    // retruns true if HTTP status code returns 200. data types matched between request and response
    // in our program we send integer data thats why setInt
    if(Firebase.RTDB.setInt(&fbdo, "Sensor/ldr_data", ldrData)){  // Sensor/ldr_data is the desired path if we dont specify path it will create automatically 
      Serial.println();Serial.print(ldrData);
      Serial.print("... successfully saved to: " + fbdo.dataPath());
      Serial.println(" (" + fbdo.dataType() + ")");
    }
    else{
      Serial.println("Failed: " + fbdo.errorReason());
    }
       if(Firebase.RTDB.setInt(&fbdo, "Sensor/voltage", voltage)){  // Sensor/ldr_data is the desired path if we dont specify path it will create automatically 
      Serial.println();Serial.print(voltage);
      Serial.print("... successfully saved to: " + fbdo.dataPath());
      Serial.println(" (" + fbdo.dataType() + ")");
    }
    else{
      Serial.println("Failed: " + fbdo.errorReason());
    }
  }


}