#include <WiFi.h>                   // Library untuk menggunakan modul WiFI ESP
#include <HTTPClient.h>             // Panggil library HTTPClient yang menyediakan banyak metode yang akan membantu kita bekerja dengan fungsionalitas HTTP
#include "DHTesp.h"                 // untuk membaca sensor DHT

const int DHT_PIN = 15;
const int LDR_PIN = 2;

DHTesp dhtSensor;

float hum;
float temp;
float ldr;
int redVal = 0;
int greenVal = 0;
int blueVal = 0;
const float gama = 0.7;
const float rl10 = 50;

HTTPClient httpku;                  // Membuat Objec bernama "httpku"

const char *ssid = "Wokwi-GUEST";   // SSID yang anda ingin terhunung dengan ESP
const char *password = "";          // Password dari SSID Tersebut

String serverName = "https://api.thingspeak.com/update?api_key=";     // Nama target server
String apiKey = "AHJIX82LF8YABOSM";

void setup() {
  Serial.begin(115200);
  pinMode(5, OUTPUT);   // LED Red
  pinMode(18, OUTPUT);  // LED Green
  pinMode(19, OUTPUT);  // LED Blue
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  WiFi.mode(WIFI_STA);                      // Station Mode : ESP32 dapat connect ke AP
  WiFi.begin(ssid, password);               // Mencoba terhubung ke jaringan ke SSID dan Password yg telah didefinisikan       
  
  while (WiFi.status() != WL_CONNECTED) {   // Tunggu hingga ESP berhasil terkoneksi ke WiFi
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");
}

void loop() {
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  hum = data.humidity;
  temp = data.temperature;
  
  Serial.print("Temperature:");
  Serial.println(temp);
  Serial.print("Humidity:");
  Serial.println(hum);

  int nilaildr = analogRead(LDR_PIN);
  nilaildr = map(nilaildr, 4095, 0, 1024, 0); //mengubah nilai pembacaan sensor LDR dari nilai ADC arduino menjadi nilai ADC ESP32
  float voltase = nilaildr / 1024.*5;
  float resistansi = 2000 * voltase / (1-voltase/5);
  float kecerahan = pow(rl10*1e3*pow(10,gama)/resistansi,(1/gama));
  
  Serial.print("LDR:");
  Serial.println(kecerahan);

  sendToThingspeak(temp, hum, ldr);
  updateIndicator(temp);
}

void sendToThingspeak(float temperature, float humidity, int ldr) {
  // Menyiapkan data yang akan dikirim dengan metode POST
  String postData = serverName + apiKey;
  postData += "&field1=" + String(temperature);
  postData += "&field2=" + String(humidity);
  postData += "&field3=" + String(ldr);
  Serial.print("Connecting to ");
  Serial.println(serverName);
  HTTPClient http;
  http.begin(serverName);
  http.addHeader("Content-Type", "application/x-www-form-urlencoded");
  
  //kurang
  int httpResponseCode = http.POST(postData);
  if (httpResponseCode>0) {
    Serial.print("Data sent to Thingspeak. Response code: ");
    Serial.println(httpResponseCode);
  } else {
    Serial.println("Error sending data to Thingspeak");
  }

  httpku.begin(postData.c_str());         // Mendefinisikan Spesific URL tujuan request
  int httpCode = httpku.POST(postData);   // Mengirimkan Request dengan POST Method dan mengembalikan nilai respon   

  http.end();
}

void updateIndicator(float temperature) {
  if (temperature > 40) {
    redVal = 255;
    greenVal = 0;
    blueVal = 0;
    digitalWrite(5, HIGH);    // Turn on Red LED
    digitalWrite(18, LOW);    // Turn off Green LED
    digitalWrite(19, LOW);    // Turn off Blue LED
  } else if (temperature > 35) {
    redVal = 255;
    greenVal = 255;
    blueVal = 0;
    digitalWrite(5, HIGH);    // Turn off Red LED
    digitalWrite(18, HIGH);   // Turn on Green LED
    digitalWrite(19, LOW);    // Turn off Blue LED
  } else {
    redVal = 0;
    greenVal = 0;
    blueVal = 255;
    digitalWrite(5, LOW);     // Turn off Red LED
    digitalWrite(18, HIGH);   // Turn off Green LED
    digitalWrite(19, LOW);    // Turn on Blue LED
  }
}