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


// Change the credentials below, so your ESP8266 connects to your router
const char* ssid = "Wokwi-GUEST";
const char* password = "";

/*
   YOU MIGHT NEED TO CHANGE MQTT_client_id, IF YOU'RE HAVING PROBLEMS WITH MQTT MULTIPLE CONNECTIONS
   To change the ESP device ID, you will have to give a new name to the ESP8266.
   For instance, you could name one of the ESP devices:
     const char* MQTT_client_id = "ESP32_COLOR_LEDS";
   Then, you can use another name for another ESP device:
     const char* MQTT_client_id = "ESP1_GARAGE";
   Then, for the other ESP:
     const char* MQTT_client_id = "ESP3_ROOM";
    That should solve your MQTT multiple connections problem
*/
const char* MQTT_client_id = "ESP32_COLOR_LEDS";
// MQTT broker credentials (set to NULL if not required)
const char* MQTT_username = ""; 
const char* MQTT_password = ""; 

// Change the variable to your Raspberry Pi IP address, so it connects to your MQTT broker
const char* mqtt_server = "mqtt-dashboard.com";

// Initializes the espClient. You should change the espClient name if you have multiple ESPs running in your home automation system
WiFiClient espClient;
PubSubClient client(espClient);


const int REDPin = 4;
const int GREENPin = 0;
const int BLUEPin = 2;
const int ORNGPin = 15;


// Timers auxiliar variables
long now = millis();
long lastMeasure = 0;

// This functions connects your ESP8266 to your router
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  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.print("WiFi connected - ESP IP address: ");
  Serial.println(WiFi.localIP());
}

// This function is executed when some device publishes a message to a topic that your ESP8266 is subscribed to
// Change the function below to add logic to your program, so when a device publishes a message to a topic that 
// your ESP device is subscribed you can actually do something
void callback(String topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // If a message is received on the topic room/lamp, you check if the message is either on or off. Turns the lamp GPIO according to the message

  if(topic=="lights/red"){
      Serial.print("Changing Red LED to ");
      if(messageTemp == "on"){
        digitalWrite(REDPin, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(REDPin, LOW);
        Serial.print("Off");
      }
  }
  if(topic=="lights/green"){
      Serial.print("Changing Green LED to ");
      if(messageTemp == "on"){
        digitalWrite(GREENPin, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(GREENPin, LOW);
        Serial.print("Off");
      }
  }
  if(topic=="lights/blue"){
      Serial.print("Changing Blue LED to ");
      if(messageTemp == "on"){
        digitalWrite(BLUEPin, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(BLUEPin, LOW);
        Serial.print("Off");
      }
  }
    if(topic=="lights/orange"){
      Serial.print("Changing Orange LED to ");
      if(messageTemp == "on"){
        digitalWrite(ORNGPin, HIGH);
        Serial.print("On");
      }
      else if(messageTemp == "off"){
        digitalWrite(ORNGPin, LOW);
        Serial.print("Off");
      }
  }
  Serial.println();
}

// This functions reconnects your ESP8266 to your MQTT broker
// Change the function below if you want to subscribe to more topics with your ESP8266 

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    
    if (client.connect(MQTT_client_id, MQTT_username, MQTT_password)) {
      Serial.println("connected");  
      // Subscribe or resubscribe to a topic
      // You can subscribe to more topics (to control more LEDs in this example)
      client.subscribe("lights/red");
      client.subscribe("lights/green");
      client.subscribe("lights/blue");
      client.subscribe("lights/orange");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

// The setup function sets your ESP GPIOs to Outputs, starts the serial communication at a baud rate of 115200
// Sets your mqtt broker and sets the callback function
// The callback function is what receives messages and actually controls the LEDs
void setup() {
  pinMode(REDPin, OUTPUT);
  pinMode(GREENPin, OUTPUT);
  pinMode(BLUEPin, OUTPUT);
  pinMode(ORNGPin, OUTPUT);
  
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

}

// For this project, you don't need to change anything in the loop function. Basically it ensures that you ESP is connected to your broker
void loop() {

  if (!client.connected()) {
    Serial.println("Client lost connection - Reconnecting");
    reconnect();
  }
  if(!client.loop())
    client.connect(MQTT_client_id, MQTT_username, MQTT_password);
  delay(1000);
}