#include <ESPMetRED.h>

const char* MQTT_PUBLISH_TOPIC = "ESPBATTBUTTON/OUT";
const char* MQTT_SUBSCRIBE_TOPIC = "ESPBATTBUTTON/IN";
const char* CLIENT_ID = "ESPBATTBUTTON";
const char* WIFI_SSID = "Ahmed";
const char* WIFI_PASSWORD = "WiFI Password";
const char* MQTT_SERVER = "192.168.50.30";
const char* MQTT_USER = "pi";
const char* MQTT_PASSWORD = "MQTT Password";

IPAddress ip(192, 168, 50, 40);
IPAddress gateway(192, 168, 50, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress dns(192, 168, 50, 1);

ESPMetRED client(ip, gateway, subnet, dns); //starting library with fixed IP

int buttons[2] = {4, 5}; // Pins on which buttons are attached
int button;              // Variable to store the button which triggered the bootup
int wake = 12;           // Pin which is used to Keep ESP awake until job is finished

boolean published = false;
boolean notified = false;

void setup() {

// ESP Awake Pin, the pin which keeps CH_PD HIGH, a requirement for normal functioning of ESP8266
  pinMode(wake, OUTPUT);
  digitalWrite(wake, HIGH);


//Check which button was pressed

  for(int i=0; i<4; i++)
  {
    pinMode(buttons[i], INPUT);
    if(digitalRead(buttons[i]) == HIGH)
    {
      button = buttons[i];
      return; //Push Button identified, Leave the loop
    }
  }
}

void loop() {
  client.keepalive(); // Necessary for successful connection between server and client

  if((client.stMqTT()) && (!published)) // stMqTT() function returns the MQTT connection state
  {
    published = true;
    client.Publish("debug", client.JsonString(String(CLIENT_ID), String(button))); //Publish the data about Pushed Button
  }

  if((published) && (digitalRead(button) == HIGH)) // Check if button is released, a debounce step
  {
    if(!notified) // Notify the server that Button is not yet released
    {
      notified = true;
      client.Publish("debug", String(CLIENT_ID) + " [ESP Waiting Release of Button]");
    }
  }
  else if((published) && (digitalRead(button) == LOW)) //Push Button has released, Let's get switched OFF
  {
    client.Publish("debug", String(CLIENT_ID) + " [ESP's Going DOWN]");
    digitalWrite(wake, LOW); //Turns the ESP OFF
  }
}