#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <PubSubClient.h>

#define LDR_PIN 12
#define LED 2


const char *ssid = "Wokwi-GUEST";
const char *password = "";
const char *mqtt_server = "broker.emqx.io";
const int mqtt_port = 1883;
const char *mqtt_topic = "ldr_status";


WiFiClient espClient;
PubSubClient client(espClient);

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  pinMode(LDR_PIN, INPUT);
  pinMode(LED, OUTPUT);

  Serial.begin(115200);
  setup_wifi();

  lcd.init();
  lcd.backlight();
  client.setServer(mqtt_server, mqtt_port);
}

void loop() {
  lcd.setCursor(0, 0);
  lcd.print("Continer: ");
  if (digitalRead(LDR_PIN) == LOW) {
    digitalWrite(LED, HIGH);
    delay(1000); 
    lcd.print("Light!");
    sendMqttMessage("Warning...! Sunlight Detected..");

  } else {
    lcd.print("Dark  ");
    sendMqttMessage("No SunLight Detected");
    digitalWrite(LED, LOW);
    delay(1000); 

  }
  delay(100);
}

void setup_wifi() {
  delay(10);
  // Connect to Wi-Fi
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
}

void sendMqttMessage(const char *message) {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  client.publish(mqtt_topic, message);
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

























































// #include <LiquidCrystal_I2C.h>

// #define LDR_PIN 12

// LiquidCrystal_I2C lcd(0x27, 16, 2);

// void setup() {
//   pinMode(LDR_PIN, INPUT);
//   lcd.init();
//   lcd.backlight();
// }

// void loop() {
//   lcd.setCursor(2, 0);
//   lcd.print("Room: ");
//   if (digitalRead(LDR_PIN) == LOW) {
//     lcd.print("Light!");
//   } else {
//     lcd.print("Dark  ");
//   }
//   delay(100);
// }