// #include <WiFi.h>  
// #include <PubSubClient.h>
// #include <WiFiClientSecure.h>
// #include <ESP32Servo.h>  // Include the ESP32Servo library

// // WiFi credentials
// char ssid[] = "Wokwi-GUEST";
// char pass[] = "";

// //---- HiveMQ Cloud Broker settings
// const char* mqtt_server = "d62fd746b0424a8984d1ddc1d670404d.s1.eu.hivemq.cloud";
// const char* mqtt_username = "flutter";
// const char* mqtt_password = "MQTT2Flutter";
// const int mqtt_port = 8883;

// WiFiClientSecure espClient;  
// PubSubClient client(espClient);

// Servo myServo;  // Create a Servo object
// int servoPin = 15;  // Define the pin connected to the servo

// // HiveMQ Cloud Let's Encrypt CA certificate
// static const char *root_ca PROGMEM = R"EOF(
// -----BEGIN CERTIFICATE-----
// MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw
// TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
// cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4
// WhcNMzUwNjA0MTEwNDM4WjBPMQswCQYDVQQGEwJVUzEpMCcGA1UEChMgSW50ZXJu
// ZXQgU2VjdXJpdHkgUmVzZWFyY2ggR3JvdXAxFTATBgNVBAMTDElTUkcgUm9vdCBY
// MTCCAiIwDQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAK3oJHP0FDfzm54rVygc
// h77ct984kIxuPOZXoHj3dcKi/vVqbvYATyjb3miGbESTtrFj/RQSa78f0uoxmyF+
// 0TM8ukj13Xnfs7j/EvEhmkvBioZxaUpmZmyPfjxwv60pIgbz5MDmgK7iS4+3mX6U
// A5/TR5d8mUgjU+g4rk8Kb4Mu0UlXjIB0ttov0DiNewNwIRt18jA8+o+u3dpjq+sW
// T8KOEUt+zwvo/7V3LvSye0rgTBIlDHCNAymg4VMk7BPZ7hm/ELNKjD+Jo2FR3qyH
// B5T0Y3HsLuJvW5iB4YlcNHlsdu87kGJ55tukmi8mxdAQ4Q7e2RCOFvu396j3x+UC
// B5iPNgiV5+I3lg02dZ77DnKxHZu8A/lJBdiB3QW0KtZB6awBdpUKD9jf1b0SHzUv
// KBds0pjBqAlkd25HN7rOrFleaJ1/ctaJxQZBKT5ZPt0m9STJEadao0xAH0ahmbWn
// OlFuhjuefXKnEgV4We0+UXgVCwOPjdAvBbI+e0ocS3MFEvzG6uBQE3xDk3SzynTn
// jh8BCNAw1FtxNrQHusEwMFxIt4I7mKZ9YIqioymCzLq9gwQbooMDQaHWBfEbwrbw
// qHyGO0aoSCqI3Haadr8faqU9GY/rOPNk3sgrDQoo//fb4hVC1CLQJ13hef4Y53CI
// rU7m2Ys6xt0nUW7/vGT1M0NPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNV
// HRMBAf8EBTADAQH/MB0GA1UdDgQWBBR5tFnme7bl5AFzgAiIyBpY9umbbjANBgkq
// hkiG9w0BAQsFAAOCAgEAVR9YqbyyqFDQDLHYGmkgJykIrGF1XIpu+ILlaS/V9lZL
// ubhzEFnTIZd+50xx+7LSYK05qAvqFyFWhfFQDlnrzuBZ6brJFe+GnY+EgPbk6ZGQ
// 3BebYhtF8GaV0nxvwuo77x/Py9auJ/GpsMiu/X1+mvoiBOv/2X/qkSsisRcOj/KK
// NFtY2PwByVS5uCbMiogziUwthDyC3+6WVwW6LLv3xLfHTjuCvjHIInNzktHCgKQ5
// ORAzI4JMPJ+GslWYHb4phowim57iaztXOoJwTdwJx4nLCgdNbOhdjsnvzqvHu7Ur
// TkXWStAmzOVyyghqpZXjFaH3pO3JLF+l+/+sKAIuvtd7u+Nxe5AW0wdeRlN8NwdC
// jNPElpzVmbUq4JUagEiuTDkHzsxHpFKVK7q4+63SM1N95R1NbdWhscdCb+ZAJzVc
// oyi3B43njTOQ5yOf+1CceWxG1bQVs5ZufpsMljq4Ui0/1lvh+wjChP4kqKOJ2qxq
// 4RgqsahDYVvTH9w7jXbyLeiNdd8XM2w9U/t7y0Ff/9yi0GE44Za4rF2LN9d11TPA
// mRGunUHBcnWEvgJBQl9nJEiU0Zsnvgc/ubhPgXRR4Xq37Z0j4r7g1SgEEzwxA57d
// emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc=
// -----END CERTIFICATE-----
// )EOF";

// unsigned long lastMsg = 0;
// int value = 0;

// void setup_wifi() {
//   delay(10);
//   Serial.println();
//   Serial.print("Connecting to ");
//   Serial.println(ssid);

//   WiFi.mode(WIFI_STA);
//   WiFi.begin(ssid, pass);

//   while (WiFi.status() != WL_CONNECTED) {
//     delay(500);
//     Serial.print(".");
//   }

//   Serial.println("");
//   Serial.println("WiFi connected");
//   Serial.println("IP address: ");
//   Serial.println(WiFi.localIP());
// }

// void callback(char* topic, byte* payload, unsigned int length) {
//   Serial.print("Message arrived [");
//   Serial.print(topic);
//   Serial.print("] ");
  
//   String messageTemp;
  
//   for (int i = 0; i < length; i++) {
//     Serial.print((char)payload[i]);
//     messageTemp += (char)payload[i];
//   }
//   Serial.println();

//   // Check if the incoming message is for controlling the servo
//   if (String(topic) == "Servo/Angle") {
//     int angle = messageTemp.toInt();  // Convert the message to an integer
//     if (angle >= 0 && angle <= 180) {  // Ensure the angle is within the valid range
//       myServo.write(angle);  // Set the servo to the specified angle
//       Serial.print("Servo angle set to: ");
//       Serial.println(angle);
      
//       // Delay to allow servo to move
//       delay(1000);
      
//       // Publish the current servo angle back to the MQTT server for real-time updates
//       char anglePayload[10];
//       sprintf(anglePayload, "%d", angle);
//       client.publish("Servo/Angle", anglePayload);
//     } else {
//       Serial.println("Invalid angle received.");
//     }
//   }
// }

// void reconnect() {
//   while (!client.connected()) {
//     Serial.print("Attempting MQTT connection… ");
//     String clientId = "ESP32Client";
//     if (client.connect(clientId.c_str(), mqtt_username, mqtt_password)) {
//       Serial.println("connected!");
//       client.publish("LDR/to/Flutter", "connected"); // IMPORTANT FOR PUBLISHING DATA
//       client.subscribe("Servo/control");  // Subscribe to the servo control topic
//     } else {
//       Serial.print("failed, rc = ");
//       Serial.print(client.state());
//       Serial.println(" try again in 5 seconds");
//       delay(5000);
//     }
//   }
// }

// void setup() {
//   delay(500);
//   Serial.begin(9600);
//   delay(500);
//   setup_wifi();
//   espClient.setCACert(root_ca);
//   client.setServer(mqtt_server, mqtt_port);
//   client.setCallback(callback);
  
//   myServo.attach(servoPin);  // Attach the servo to the specified pin
// }

// void loop() {
//   if (!client.connected()) {
//     reconnect();
//   }
//   client.loop();

//   int sensorValue = analogRead(33); // Replace 33 with the actual analog pin for LDR sensor

//   char payload[50];
//   sprintf(payload, "%d", sensorValue);
//   client.publish("LDR/to/Flutter", payload);

//   delay(1000); // Adjust the delay as needed
// }


#include <WiFi.h>
#include <PubSubClient.h>
#include <WiFiClientSecure.h>
#include <ESP32Servo.h>

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* pass = "";

// HiveMQ Cloud Broker settings
const char* mqtt_server = "d62fd746b0424a8984d1ddc1d670404d.s1.eu.hivemq.cloud";
const char* mqtt_username = "flutter";
const char* mqtt_password = "MQTT2Flutter";
const int mqtt_port = 8883;

WiFiClientSecure espClient;
PubSubClient client(espClient);

// HiveMQ Cloud Let's Encrypt CA certificate
static const char *root_ca PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----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=
-----END CERTIFICATE-----
)EOF";

Servo myServo;  // Create a Servo object
const int servoPin = 15;  // Define the pin connected to the servo
const int ldrPin = 33;    // Define the pin connected to the LDR sensor

const char* servoTopic = "Servo/Angle";
const char* ldrTopic = "LDR/to/Flutter";

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, pass);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message arrived [");
  Serial.print(topic);
  Serial.print("] ");

  // Create a null-terminated string from the payload
  char message[length + 1];
  memcpy(message, payload, length);
  message[length] = '\0';

  Serial.print("Received message: ");
  Serial.println(message);

  // Check if the incoming message is for controlling the servo
  if (strcmp(topic, servoTopic) == 0) {
    int angle = atoi(message);  // Convert the message to an integer
    Serial.print("Received angle: ");
    Serial.println(angle);
    
    if (angle >= 0 && angle <= 180) {  // Ensure the angle is within the valid range
      myServo.write(angle);  // Set the servo to the specified angle
      Serial.print("Servo angle set to: ");
      Serial.println(angle);
      
      // Publish the current servo angle back to the MQTT server for real-time updates
      char anglePayload[10];
      snprintf(anglePayload, sizeof(anglePayload), "%d", angle);
      client.publish("Servo/angle", anglePayload);
    } else {
      Serial.println("Invalid servo angle received. Angle must be between 0 and 180.");
    }
  } else {
    Serial.println("Message received on unknown topic");
  }
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection... ");
    String clientId = "ESP32Client-" + String(random(0xffff), HEX);
    if (client.connect(clientId.c_str(), mqtt_username, mqtt_password)) {
      Serial.println("connected");
      client.publish(ldrTopic, "ESP32 connected");
      client.subscribe(servoTopic);  // Subscribe to the servo control topic
      Serial.println("Subscribed to Servo/control topic");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(9600);
  delay(500);
  setup_wifi();
  espClient.setCACert(root_ca);
  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
  
  myServo.attach(servoPin);  // Attach the servo to the specified pin
  pinMode(ldrPin, INPUT);    // Set LDR pin as input
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();  // This line is crucial for processing incoming messages

  // Read LDR sensor value
  int sensorValue = analogRead(ldrPin);

  // Publish sensor value to the MQTT server
  char payload[50];
  snprintf(payload, sizeof(payload), "%d", sensorValue);
  client.publish(ldrTopic, payload);

  delay(1000); // Adjust the delay as needed
}