#include "WiFi.h"
#include <LiquidCrystal_I2C.h>
#include <PubSubClient.h>


const char* ssid = "Wokwi-GUEST";
const char* password = "";

const char* topic = "@msg/micro-photo";
char server[] = "broker.netpie.io";
char ClientID[] = "85424b3a-3ed4-4599-916b-92c79fed6c31";
char token[] = "eoXfKcVNuVtCFnfoqJ16N62StuNA2KuS";
char secret[] = "pv-y8l8*pTBGODMAaP~w#78(2RThaXG)";


WiFiClient espClient;
PubSubClient client(espClient);
LiquidCrystal_I2C lcd(0x27, 16, 2);

int value = 0;
String callbackmsg = "";

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, 6);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  randomSeed(micros());

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

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

  String lux_str, totalItem_str;
  int data_idx;
  data_idx = callbackmsg.indexOf("lux");
  totalItem_str = callbackmsg.substring(data_idx + 5);
  data_idx = totalItem_str.indexOf("}");
  lux_str = totalItem_str.substring(0, data_idx);
  Serial.print("lux = ");
  Serial.println(lux_str);
  lcd.setCursor(1, 0);
  lcd.print("Ilumination");
  lcd.setCursor(1, 1);
  lcd.print(lux_str);
  lcd.print(" lux        ");

  if (lux_str.toFloat() < 100) {
    setLed(1);
  } else {
    setLed(0);
  }
}

void setLed(int value) {
  digitalWrite(4, value);
}


void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP8266Client-620701072";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    if (client.connect(ClientID, token, secret)) {
      Serial.println("connected");
      // Once connected, publish an announcement...
      client.publish(topic, "photo receiver");
      // ... and resubscribe
      client.subscribe(topic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

void setup() {
  lcd.init();  
  lcd.backlight();
  pinMode(4, OUTPUT);
  Serial.begin(115200);
  setup_wifi();
  client.setServer(server, 1883);
  client.setCallback(callback);
}

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