#include <Adafruit_Sensor.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Arduino.h>
#include <U8g2lib.h>
#include <RH_ASK.h>

RH_ASK driver(2000, 2,5, 0);

#ifdef U8X8_HAVE_HW_SPI
#include <SPI.h>
#endif
#ifdef U8X8_HAVE_HW_I2C
#include <Wire.h>
#endif

U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);

uint8_t buf[32];
uint8_t buflen = 32;

const char* ssid = "Nackademin-IOT";
const char* password = "Nack@!pr";
const char* mqtt_server = "172.20.216.18"; //Raspberry mac: dc:a6:32:0a:e9:10

const char* subscribeTopic = "iot/publish";
const char* publishTopic = "iot/publish";

WiFiClient espClient;
PubSubClient client(espClient);

long lastMsg = 0;
char msg[50];

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(".");
  }

  randomSeed(micros()); //Viktigt för att alla inte ska kopplas upp samtidigt.

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void callback(char* topic, byte* payload, unsigned int length) {
  //Serial.print("Message arrived [");
  //Serial.print(topic);
  //Serial.print("] ");
  char annanCharArray[50];
  for (int i = 0; i < length; i++) {
    //Serial.print((char)payload[i]);
    annanCharArray[i] = payload[i];
  }

  //Serial.println(annanCharArray);
    // Här kan man skriva ut på displayen. Spara payload i en annan chararray.
  u8g2.clearBuffer();          // clear the internal memory
  u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
  u8g2.drawStr(0,10, (char*) annanCharArray);  // write something to the internal memory
  u8g2.sendBuffer();          // transfer internal memory to the display
  //}
  //Serial.println();
}

void reconnect() {
  while (!client.connected()) {
    String clientId = "ESP8266Client-";
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str())) {
      client.subscribe(subscribeTopic);
    } else {
      delay(5000);
    }
  }
}

void setup() {
  driver.init();
  u8g2.begin();
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

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

  /*if(driver.recv(buf, &buflen)) {
    Serial.println((char*)buf);
  }*/
  client.loop();

  long now = millis();
  if(driver.recv(buf, &buflen)) {
    if(now - lastMsg > 2000) {
      lastMsg = now;
      snprintf (msg, 50, "Temp: ");
      uint8 *uint8_pointer = buf;
      const char *char_pointer = (char*)uint8_pointer;
      strcat(msg, char_pointer);
      client.publish(publishTopic, msg);
    }
  }
}