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

#ifdef LED
#undef LED
#endif

#define LED 23 // GPIO 5 (D1) for LED
bool led_State = false;

#define REL1 32 // GPIO 5 (D1) for LED
bool rel1_State = false;

#define REL2 33 // GPIO 5 (D1) for LED
bool rel2_State = false;

#define REL3 25 // GPIO 5 (D1) for LED
bool rel3_State = false;

#define REL4 26 // GPIO 5 (D1) for LED
bool rel4_State = false;



// WiFi settings
const char *ssid = "Acasuca_2.4G";             // Replace with your WiFi name
const char *password = "kNY2ph3mmrnT6zk4";   // Replace with your WiFi password

// MQTT Broker settings
const char *mqtt_broker = "masserv.utcluj.ro";  // EMQX broker endpoint
const char *mqtt_topic = "mass/esp8266";     // MQTT topic
const char *mqtt_username = "iot_client";  // MQTT username for authentication
const char *mqtt_password = "ASA123";  // MQTT password for authentication
const int mqtt_port = 1883;  // MQTT port (TCP)

WiFiClient espClient;
PubSubClient mqtt_client(espClient);

void connectToWiFi();

void connectToMQTTBroker();

void mqttCallback(char *topic, byte *payload, unsigned int length);


void setup() {

    pinMode(LED, OUTPUT);
    digitalWrite(LED, LOW);

    pinMode(REL1, OUTPUT);
    digitalWrite(REL1, LOW);
    pinMode(REL2, OUTPUT);
    digitalWrite(REL2, LOW);
    pinMode(REL3, OUTPUT);
    digitalWrite(REL3, LOW);
    pinMode(REL4, OUTPUT);
    digitalWrite(REL4, LOW);

    Serial.begin(115200);
    connectToWiFi();
    mqtt_client.setServer(mqtt_broker, mqtt_port);
    mqtt_client.setCallback(mqttCallback);
    connectToMQTTBroker();
}

void connectToWiFi() {
    WiFi.begin(ssid, password);
    Serial.print("Connecting to WiFi");
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\nConnected to the WiFi network");
}

void connectToMQTTBroker() {
    while (!mqtt_client.connected()) {
        String client_id = "esp32-client-" + String(WiFi.macAddress());
        Serial.printf("Connecting to MQTT Broker as %s.....\n", client_id.c_str())
;
        if (mqtt_client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
            Serial.println("Connected to MQTT broker");
            mqtt_client.subscribe(mqtt_topic);

            // Publish message upon successful connection
            mqtt_client.publish(mqtt_topic, "Hi mass I'm ESP32 4 Channels Relay ^^");

        } else {
            Serial.print("Failed to connect to MQTT broker, rc=");
            Serial.print(mqtt_client.state());
            Serial.println(" try again in 5 seconds");
            delay(5000);
        }
    }
}

void mqttCallback(char *topic, byte *payload, unsigned int length) {
    Serial.print("Message received on topic: ");
    Serial.println(topic);
    Serial.print("Message:");

    String message;
    for (int i = 0; i < length; i++) {
        message += (char) payload[i];  // Convert *byte to string
    }

    // Read Temperature if "temp" message is received
    if (message == "temp") {

        int temperature = analogRead(A0);
        mqtt_client.publish(mqtt_topic, String(temperature).c_str(), true);

        Serial.print("Temperature is:");
        Serial.println(temperature);
    }


    // LED Control the LED based on the message received
    if (message == "ledon" && !led_State) {
        digitalWrite(LED, HIGH);  // Turn on the LED
        led_State = true;
        Serial.println("LED is turned on");
    }

    if (message == "ledoff" && led_State) {
        digitalWrite(LED, LOW); // Turn off the LED
        led_State = false;
        Serial.println("LED is turned off");
    }


    // R1 Control the Relay based on the message received
    if (message == "onr1" && !rel1_State) {
        digitalWrite(REL1, HIGH);  // Turn on the LED
        rel1_State = true;
        Serial.println("Rel1 is turned on");
    }

    if (message == "offr1" && rel1_State) {
        digitalWrite(REL1, LOW); // Turn off the LED
        rel1_State = false;
        Serial.println("Rel1 is turned off");
    }


   // R2 Control the Relay based on the message received
    if (message == "onr2" && !rel2_State) {
        digitalWrite(REL2, HIGH);  // Turn on the LED
        rel2_State = true;
        Serial.println("Rel2 is turned on");
    }

    if (message == "offr2" && rel2_State ) {
        digitalWrite(REL2, LOW); // Turn off the LED
        rel2_State = false;
        Serial.println("Rel2 is turned off");
    }


    // R3 Control the Relay based on the message received
    if (message == "onr3" && !rel3_State) {
        digitalWrite(REL3, HIGH);  // Turn on the LED
        rel3_State = true;
        Serial.println("Rel3 is turned on");
    }

    if (message == "offr3" && rel3_State) {
        digitalWrite(REL3, LOW); // Turn off the LED
        rel3_State = false;
        Serial.println("Rel3 is turned off");
    }


    // R4 Control the Relay based on the message received
    if (message == "onr4" && !rel4_State) {
        digitalWrite(REL4, HIGH);  // Turn on the LED
        rel4_State = true;
        Serial.println("Rel4 is turned on");
    }

    if (message == "offr4" && rel4_State) {
        digitalWrite(REL4, LOW); // Turn off the LED
        rel4_State = false;
        Serial.println("Rel4 is turned off");
    }



    Serial.println();
    Serial.println("-----------------------");
}

void loop() {
    if (!mqtt_client.connected()) {
        connectToMQTTBroker();
    }
    mqtt_client.loop();
}