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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

// key
#include <Keypad.h>

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 25, 33, 32, 13 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 12, 14, 27, 26 }; // Pins connected to R1, R2, R3, R4

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic = "conghoa";

// Tạo ID ngẫu nhiên tại: https://www.guidgen.com/
const char * MQTT_ID = "conghoa";
int Port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 18;

void WIFIConnect() {
  Serial.println("Connecting to SSID: Wokwi-GUEST");
  WiFi.begin("Wokwi-GUEST", "");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("WiFi connected");
  Serial.print(", IP address: ");
  Serial.println(WiFi.localIP());
}

void MQTT_Reconnect() {
  while (!client.connected()) {
    if (client.connect(MQTT_ID)) {
      Serial.print("MQTT Topic: ");
      Serial.print(MQTT_Topic);
      Serial.print(" connected");
      client.subscribe(MQTT_Topic);
      Serial.println("");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  String stMessage;

  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    stMessage += (char)message[i];
  }

  if("3" == stMessage){
    digitalWrite(ledPin, 1);
    delay(3000);
  }

  else if("5" == stMessage){
    digitalWrite(ledPin, 1);
    delay(1000);
    digitalWrite(ledPin, 0);
    delay(1000);
    digitalWrite(ledPin, 1);
    delay(1000);
    digitalWrite(ledPin, 0);
    delay(1000);
  }else{
    StaticJsonDocument<200> doc;
    deserializeJson(doc, stMessage);

    String ht = doc["ht"];
    String ms = doc["ms"];

    lcd.setCursor(0, 0);
    lcd.print(ht);

    lcd.setCursor(0, 1);
    lcd.print(ms);
  }

}
String kq = "";
void sendData(){
  // Key
  char key = keypad.getKey();

  if (key != NO_KEY) {

    kq+= key;

    Serial.println(kq);
  }

  if(key == '#'){
    StaticJsonDocument<200> doc2;
    doc2["kq"] = kq;

    String str = "";

    serializeJson(doc2, str);

    client.publish("mk2", str.c_str());
    Serial.println("dung r");
    kq = "";
  }
}

void setup() {
  Serial.begin(115200);

  WIFIConnect();
  client.setServer(MQTTServer, Port);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);

  // Init
  lcd.init();
  lcd.backlight();
}

void loop() {
  delay(10);
  if (!client.connected()) {
    MQTT_Reconnect();
  }
  client.loop();

  sendData();
}