/*
  Rui Santos
  Complete project details at https://RandomNerdTutorials.com/epoch-unix-time-esp32-arduino/
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files.
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
*/
//-------------------------------------------------------------------Wifi Date/time stuff
//include wifi and time to get real date/time data
#include <WiFi.h>
#include "time.h"
//-------------------------------------------------------------------Wifi Date/time stuff

#include <ArduinoJson.h>
#include <Arduino.h>
#include "DHT.h"

#define DHTPIN 20
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

int readingNumber = 1;
String temp = "";

//-------------------------------------------------------------------Wifi Date/time stuff
// Replace with your network credentials  //-------------------------Wifi Date/time stuff
const char* ssid = "NetworkName";    //-------------------------Wifi Date/time stuff
const char* password = "Password";    //---------------------------Wifi Date/time stuff
//-------------------------------------------------------------------Wifi Date/time stuff
// NTP server to request epoch time
const char* ntpServer = "pool.ntp.org";    //------------------------Wifi Date/time stuff
// Variable to save current epoch time
unsigned long epochTime;    //---------------------------------------Wifi Date/time stuff

// Function that gets current epoch time
unsigned long getTime() {//---------------------------------------Wifi Date/time stuff
  time_t now;//---------------------------------------Wifi Date/time stuff
  struct tm timeinfo;
  if (!getLocalTime(&timeinfo)) {
    //Serial.println("Failed to obtain time");
    return(0);
  }
  time(&now);
  return now;
}

// Initialize WiFi
void initWiFi() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi ..");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print('.');
    delay(1000);
  }
  Serial.println(WiFi.localIP());
}
//-------------------------------------------------------------------Wifi Date/time stuff


void setup(void) {
//-------------------------------------------------------------------Wifi Date/time stuff
  Serial.begin(115200);
  initWiFi();
  configTime(0, 0, ntpServer);
//-------------------------------------------------------------------Wifi Date/time stuff
  dht.begin();
}

void loop(void) {
//-------------------------------------------------------------------Wifi Date/time stuff
  epochTime = getTime();
  //Serial.print("Epoch Time: ");
  //Serial.println(epochTime);
  delay(1000);
//-------------------------------------------------------------------Wifi Date/time stuff


  //For this example I only want 6 readings to be output to json
  while(readingNumber < 7){
    if(readingNumber == 1){
      //need open bracket before putting in json data
      Serial.println("[");     
    }

    float t = dht.readTemperature();

    // deley between each temperature reading
    delay(1000);

    //get data in json format
    StaticJsonDocument<1024> doc;
    String json;
    
    doc["date"] = epochTime;
    doc["temperature"] = t;

    serializeJson(doc, json);
    serializeJsonPretty(doc, Serial);  
    
    //need a comma "," between each reading
    if(readingNumber < 6){
      Serial.println(",");
    }

    //need closing bracket after last json data
    if(readingNumber == 6){
      Serial.println();
      Serial.println("]");
    }

    readingNumber++;
  }

}