/*********
 * Adaptação: Marcos Chaves outubro/2022
 Fontes:
  Complete project details at http://randomnerdtutorials.com  
  https://www.arduino.cc/reference/en/libraries/wifi/

  
*********/

// Carregar biblioteca Wifi
#include <WiFi.h>
#include <PubSubClient.h>
#include <iostream>
#include <sstream>

String frase1;

const char *ssid = "WI-FI Xuxa"; 
const char *password = "xuxa2022";  

const char *mqtt_broker = "broker.hivemq.com";
const char *topic = "IFSP/bodavolis";
const char *topic2;
const char *mqtt_username = "mchavesferreira";
const char *mqtt_password = "Embar2022";
const int mqtt_port = 1883;

WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

// configurar porta para webserver 80
WiFiServer server(80);

// Variavle de armazenamento HTTP request
String header;

// variavel auxiliar para armzanenr o estado das saidas
String output26State = "off";
String temp = "0";
String output27State = "off";

// varivel para pinos GPIO
const int output26 = 26;
const int output27 = 27;
int number1;
int number2;
int number3;
int number4;
int tempo = 1;
int estado = 0;
String valor1;
String valor2;
String valor3;
//char inicio = "IFSP/";
String saida;

// Tempo atual
unsigned long currentTime = millis();
// Proximo tempo
unsigned long previousTime = 0; 
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;

void setup() {
  // inicia porta comunicação serial
  Serial.begin(115200);  // velocidade 115200 bauds/segundo
  // Configura os pinos GPIO
  pinMode(output26, OUTPUT);
  pinMode(output27, OUTPUT);
  // configura saida em Baixo
  digitalWrite(output26, LOW);
  digitalWrite(output27, LOW);

  // Conecta a rede wifi, SSID e password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  // aguarda conexao wifi
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Imprime na serial endereço da IP e web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());  /// ip do esp conectado a sua rede
  Serial.print("ESP Board MAC Address:  ");
  Serial.println(WiFi.macAddress());
  Serial.print("RRSI: ");
  Serial.println(WiFi.RSSI());
  server.begin();

  mqttClient.setServer(mqtt_broker, mqtt_port);
  mqttClient.setCallback(callback);
  while (!mqttClient.connected()) {
    String client_id = String(WiFi.macAddress());
 
      if (mqttClient.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
          Serial.println("Connected to Public MQTT Broker");
      } else {
          Serial.print("Failed to connect with MQTT Broker");
          Serial.print(mqttClient.state());
          delay(2000);
      }
  }
}

void loop(){
  // Cria um cliente que pode se conectar a um endereço IP
  WiFiClient client = server.available();   // Listen for incoming clients

  mqttClient.loop();

  if (client) {                             // If a new client connects,
    currentTime = millis();
    previousTime = currentTime;
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected() && currentTime - previousTime <= timeoutTime) {  // loop while the client's connected
      currentTime = millis();
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            LoopRandom();
            // turns the GPIOs on and off


            if (header.indexOf("GET /26/on") >= 0) {
              Serial.println("GPIO 26 on");
              mqttClient.subscribe(topic);
              mqttClient.subscribe(topic2);
              mqttClient.publish(topic, frase1.c_str());
              delay(1000);
              mqttClient.publish(topic2, "on");
              output26State = "Ligado";
              digitalWrite(output26, HIGH);
            } else if (header.indexOf("GET /26/off") >= 0) {
              Serial.println("GPIO 26 off");
              output26State = "Desligado";
              mqttClient.subscribe(topic);
              mqttClient.subscribe(topic2);
              mqttClient.publish(topic, frase1.c_str());
              delay(1000);
              mqttClient.publish(topic2, "off");
              digitalWrite(output26, LOW);
            } else if (header.indexOf("GET /27/on") >= 0) {
              Serial.println("GPIO 27 on");
              output27State = "on";
              digitalWrite(output27, HIGH);
            } else if (header.indexOf("GET /27/off") >= 0) {
              Serial.println("GPIO 27 off");
              output27State = "off";
              digitalWrite(output27, LOW);
            }
            
            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<link rel=\"icon\" href=\"data:,\">");
            // CSS to style the on/off buttons 
            // Feel free to change the background-color and font-size attributes to fit your preferences
            client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
            client.println(".button { background-color: #555555; border: none; color: white; padding: 16px 40px;");
            client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
            client.println(".button2 {background-color: #4CAF50;}</style></head>");
            
            // Web Page Heading
            //client.println("<body><h1>Micro-Ondas Bodavolis</h1>");
            //client.println("<label for=\"temperatura\">Temperatura </label>0 <a href=\"/temp\"><input type=\"text\" id=\"/temp\" name=\"temperatura\"></a\>250<br>");

            /*if (header.indexOf("/temp") >= 0 ){
              temp = header.indexOf("/temp");
              Serial.println(temp);
            }*/
            
            // Display current state, and ON/OFF buttons for GPIO 26  
            client.println("<p>Ligar/Desligar - Estado " + output26State + "</p>");
            // If the output26State is off, it displays the ON button       
            if (output26State=="Desligado") {
              client.println("<p><a href=\"/26/on\"><button class=\"button\">OFF</button></a></p>");
            } else {
              client.println("<p><a href=\"/26/off\"><button class=\"button button2\">ON</button></a></p>");
            } 
               
            // Display current state, and ON/OFF buttons for GPIO 27  
            /*client.println("<p>GPIO 27 - State " + output27State + "</p>");
            // If the output27State is off, it displays the ON button       
            if (output27State=="off") {
              client.println("<p><a href=\"/27/on\"><button class=\"button\">OFF</button></a></p>");
            } else {
              client.println("<p><a href=\"/27/off\"><button class=\"button button2\">ON</button></a></p>");
            }
            */
            client.println("</body></html>");
            
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
    
    frase1 = "";
    tempo = 1;
  }
}

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


void LoopRandom(){
  while(tempo <= 25){
    number1 = random(1,26);
    number2 = random(1,26);
    number3 = random(1,4);
    number4 = random(5);

    if (number1 == 1) {valor1 = "a";}
    if (number1 == 2) {valor1 = "b";}
    if (number1 == 3) {valor1 = "c";}
    if (number1 == 4) {valor1 = "d";}
    if (number1 == 5) {valor1 = "e";}
    if (number1 == 6) {valor1 = "f";}
    if (number1 == 7) {valor1 = "g";}
    if (number1 == 8) {valor1 = "h";}
    if (number1 == 9) {valor1 = "i";}
    if (number1 == 10) {valor1 = "j";}
    if (number1 == 11) {valor1 = "k";}
    if (number1 == 12) {valor1 = "l";}
    if (number1 == 13) {valor1 = "m";}
    if (number1 == 14) {valor1 = "n";}
    if (number1 == 15) {valor1 = "o";}
    if (number1 == 16) {valor1 = "p";}
    if (number1 == 17) {valor1 = "q";}
    if (number1 == 18) {valor1 = "r";}
    if (number1 == 19) {valor1 = "s";}
    if (number1 == 20) {valor1 = "t";}
    if (number1 == 21) {valor1 = "u";}
    if (number1 == 22) {valor1 = "v";}
    if (number1 == 23) {valor1 = "w";}
    if (number1 == 24) {valor1 = "x";}
    if (number1 == 25) {valor1 = "y";}
    if (number1 == 26) {valor1 = "z";}

    if (number2 == 1) {valor2 = "A";}
    if (number2 == 2) {valor2 = "B";}
    if (number2 == 3) {valor2 = "C";}
    if (number2 == 4) {valor2 = "D";}
    if (number2 == 5) {valor2 = "E";}
    if (number2 == 6) {valor2 = "F";}
    if (number2 == 7) {valor2 = "G";}
    if (number2 == 8) {valor2 = "H";}
    if (number2 == 9) {valor2 = "I";}
    if (number2 == 10) {valor2 = "J";}
    if (number2 == 11) {valor2 = "K";}
    if (number2 == 12) {valor2 = "L";}
    if (number2 == 13) {valor2 = "M";}
    if (number2 == 14) {valor2 = "N";}
    if (number2 == 15) {valor2 = "O";}
    if (number2 == 16) {valor2 = "P";}
    if (number2 == 17) {valor2 = "Q";}
    if (number2 == 18) {valor2 = "R";}
    if (number2 == 19) {valor2 = "S";}
    if (number2 == 20) {valor2 = "T";}
    if (number2 == 21) {valor2 = "U";}
    if (number2 == 22) {valor2 = "V";}
    if (number2 == 23) {valor2 = "W";}
    if (number2 == 24) {valor2 = "X";}
    if (number2 == 25) {valor2 = "Y";}
    if (number2 == 26) {valor2 = "Z";}

    if (number3 == 1) {valor3 = "!";}
    if (number3 == 2) {valor3 = "@";}
    if (number3 == 3) {valor3 = "%";}
    if (number3 == 4) {valor3 = "#";}

    if (number4 == 0) {frase1 = frase1 + valor1 + valor2 + valor3;}
    if (number4 == 1) {frase1 = frase1 + valor1 + valor3 + valor2;}
    if (number4 == 2) {frase1 = frase1 + valor2 + valor1 + valor3;}
    if (number4 == 3) {frase1 = frase1 + valor2 + valor3 + valor1;}
    if (number4 == 4) {frase1 = frase1 + valor3 + valor1 + valor2;}
    if (number4 == 5) {frase1 = frase1 + valor3 + valor2 + valor1;}


    tempo++;


  }
  frase1 = "IFSP/" + frase1;

  topic2 = frase1.c_str();
}