#include <SPI.h>
#include <Ethernet.h>
#include <PubSubClient.h>
#include <RCSwitch.h>

/*
 * ===============================
 * RC-SWITCH SETTINGS
 * ===============================
 */
RCSwitch mySwitch = RCSwitch();

/*
 * ===============================
 * MQTT SETTINGS
 * ===============================
 */
#define MQTT_VERSION MQTT_VERSION_3_1_1

// MQTT: ID, server IP, port
const PROGMEM char* MQTT_CLIENT_ID = "home-assistant-1";
const PROGMEM char* MQTT_SERVER_IP = "192.168.1.xx";
const PROGMEM uint16_t MQTT_SERVER_PORT = 1883;
const PROGMEM char* MQTT_USER = "myuser";
const PROGMEM char* MQTT_PASSWORD = "abcdefg";


const char* MQTT_LIGHT_STATE_TOPIC = "main/desk/status";
const char* MQTT_LIGHT_COMMAND_TOPIC = "main/desk/switch";

const char* LIGHT_ON = "ON";
const char* LIGHT_OFF = "OFF";
boolean m_light_state = false; // light is turned off by default

PubSubClient client;

void statusLight() {
  if (m_light_state) {
    client.publish(MQTT_LIGHT_STATE_TOPIC, LIGHT_ON, true);
  } else {
    client.publish(MQTT_LIGHT_STATE_TOPIC, LIGHT_OFF, true);
  }
}

// function called to turn on/off the light
void setLight() {
  if (m_light_state) {
    mySwitch.send("00010101010100010101000");
    Serial.println("INFO: Turn light on...");
  } else {
   mySwitch.send("00010101010100010101000");
    Serial.println("INFO: Turn light off...");
  }
}

void callback(char* p_topic, byte* p_payload, unsigned int p_length) {
  // concat the payload into a string
  String payload;
  for (uint8_t i = 0; i < p_length; i++) {
    payload.concat((char)p_payload[i]);
  }

  Serial.println("This is the payload");
  Serial.print(payload);
  // handle message topic
  if (String(MQTT_LIGHT_COMMAND_TOPIC).equals(p_topic)) {
    // test if the payload is equal to "ON" or "OFF"
    if (payload.equals(String(LIGHT_ON))) {
      if (m_light_state != true) {
        m_light_state = true;
        setLight();
        statusLight();
      }
    } else if (payload.equals(String(LIGHT_OFF))) {
      if (m_light_state != false) {
        m_light_state = false;
        setLight();
        statusLight();
      }
    }
  }
}

void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("INFO: Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(MQTT_CLIENT_ID,MQTT_USER,MQTT_PASSWORD)) {
      Serial.println("INFO: connected");
      // Once connected, publish an announcement...
      statusLight();
      // ... and resubscribe
      client.subscribe(MQTT_LIGHT_COMMAND_TOPIC);
    } else {
      Serial.print("ERROR: failed, rc=");
      Serial.print(client.state());
      Serial.println("DEBUG: try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

/*
 * ===============================
 * ETHERNET SETTINGS
 * ===============================
 */
byte MAC_ADDRESS[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };


void setup() {
  // init the serial
  Serial.begin(115200);

  //RC-switch initialization
  mySwitch.enableTransmit(24);
  mySwitch.setPulseLength(296);
   mySwitch.setProtocol(1);
  mySwitch.setRepeatTransmit(15);

  setLight();

   if (Ethernet.begin(MAC_ADDRESS) == 0)
  {
      Serial.println("Failed to configure Ethernet using DHCP");
      return;
  }

  // init the MQTT connection
  client.setServer(MQTT_SERVER_IP, MQTT_SERVER_PORT);
  client.setCallback(callback);
}

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

}