#include <LiquidCrystal_I2C.h>
#include <PubSubClient.h>
#include <WiFi.h>
#include "DHTesp.h"
#include <ArduinoJson.h>
#include <HTTPClient.h>

LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x27 for a 16 chars and 2 line display
String serverName = "https://postman-echo.com/get";

#define DHT_PIN 15
#define LED_PIN 32
#define LED_PIN2 14
#define LED_PIN3 2
#define PIR_SENSOR 12

DHTesp dhtSensor;

unsigned long lastMsg = 0;
#define MSG_BUFFER_SIZE	(200) // Increased buffer size to accommodate larger JSON string
char msg[MSG_BUFFER_SIZE];
int value = 0;

WiFiClient espClient;
PubSubClient client(espClient);
const char* mqtt_server = "broker.emqx.io";

void setup() {
  // Config LED_PIN output
  pinMode(LED_PIN, OUTPUT);
  // Setup for serial communication
  Serial.begin(9600);
  
  // Initialize the LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(1, 0);
  lcd.print("ESP32 collecting data ...");
  Serial.println("ESP32 collecting sensors data");
  
  // Setup for DHT sensor
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(PIR_SENSOR, INPUT);
  delay(1000);

  Serial.print("Connecting to WiFi");
  //setup for WiFi connection
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
  delay(100);
  Serial.print(".");
  }
  Serial.println("WiFi Connected!");
}


void loop() {
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  int temp = data.temperature;
  int humid = data.humidity;
  int pir_value = digitalRead(PIR_SENSOR);
  
  unsigned long now = millis();
  if (now - lastMsg > 2000) {
  lastMsg = now;
  ++value;
  Serial.print("Temp: ");
  Serial.print(temp);
  Serial.print(", Humid: ");
  Serial.print(humid);
  Serial.print("\n");
  }

  // Update the LCD display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Temp: ");
  lcd.print(temp);
  lcd.setCursor(0, 1);
  lcd.print("Humidity: ");
  lcd.print(humid);

  // Control LED based on PIR sensor value
  if (pir_value == 1) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }

  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    String serverPath = serverName + "?temp=24.7&humid=30";
    http.begin(serverPath.c_str()); // Send HTTP GET request
    int httpResponseCode = http.GET();
    if (httpResponseCode > 0) {
      Serial.print("HTTP Response code: "); Serial.println(httpResponseCode);
      String payload = http.getString();
      Serial.println(payload);
    }
    else {
      Serial.print("Error code: "); Serial.println(httpResponseCode);
    }
    http.end();
  }
  else {
    Serial.println("WiFi Disconnected");
  }
  delay(500);
}