#define BLYNK_TEMPLATE_ID "TMPL6Q2ULC2Vv" //Id cua template tren blynk 
#define BLYNK_TEMPLATE_NAME "smartHome" // ten cua template tren blynk
#define BLYNK_AUTH_TOKEN "xBFmGopuzHwtN2E7aJW4yRWJJ1KKa9Ak"  // ma xac thuc(token) de ket noi voi blynk
//#include <WiFi.h>
#include <BlynkSimpleEsp32.h> // thu vien de ket noi voi blynk tren esp32
//----------------------------------
#include <Wire.h>  //thu vien de ket noi I2c(ket noi voi LCD) ;giup giam chan cam
#include <LiquidCrystal_I2C.h> // thu vien ket noi man hinh dieu khien LCD
#include <ESP32Servo.h> // thu vien de dieu khien servo
#include <Keypad.h> // thu vien doc thong tin tu keypad

#define LCD_I2C_ADDR 0x27 // dia chi cua module lcd I2C
LiquidCrystal_I2C lcd(0x27, 16, 2); // khoi tao doi tuong LCD I2C voi kich thuoc man hinh cu the 
Servo servo; // khai bao servo co ten la servo
const byte ROW_NUM = 4; // khai bao so hang cua keypad
const byte COL_NUM = 4; // khai bao so cot cua keypad

char keys[ROW_NUM][COL_NUM] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
}; // khai bao mang 4x4 , voi cac gia tri la gia tri tren keypad tuong ung
byte pin_rows[ROW_NUM] = { 25, 26, 27, 14 }; // pin hang tu R1-4
byte pin_cols[COL_NUM] = { 5, 18, 32, 33 };// pin cot tu C1-4
Keypad keypad = Keypad(makeKeymap(keys), pin_rows, pin_cols, ROW_NUM,COL_NUM); // thiet lap keypad
String password = "1111"; // pass mac dinh la 1111
bool codeEntered = false; // trang thai pass da dung hay chua
String pwd = ""; // khai bao chuoi de luu pass nhap tu ban phim
int n = 0; // khai bao so gia tri duoc nhap vao tu ban phim
int resetPwd = 0; // khai bao gia tri so lan nhap pass

//-------------------------------------
char auth[] = "xBFmGopuzHwtN2E7aJW4yRWJJ1KKa9Ak"; // ma xac thuc(token) de ket noi voi Blynk
char ssid[] = "Wokwi-GUEST"; // ten mang wifi ket noi den(ao vi day la mo phong)
char pass[] = "";//mat khau mang wifi(nay cung co san)
#define purpleLed 4 
#define purpleButton 0
#define redLed 16
#define redButton 2
#define whiteLed 17
#define whiteButton 15 // pin led, button tuong ung
int p1;// cac bien lay du lieu tu blynk
int buttonsauPurple; // bien luu gia tri khi nhan nut ButtonPurple
int p2;// cac bien lay du lieu tu blynk
int buttonsauRed;// bien luu gia tri khi nhan nut ButtonRed
int p3;// cac bien lay du lieu tu blynk
int buttonsauWhite; // bien luu gia tri khi nhan nut ButtonWhites
int p4;// cac bien lay du lieu tu blynk
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); // thiet lap cong series de gui va nhan du lieu 9600 bit moi giay
  // Blynk.begin(auth,ssid,pass);
  //-------------
  servo.attach(23); // chan servo duoc gan
  servo.write(90); // trang thai ban dau cua servo( dong cua)
  lcd.init(); // khoi tao lcd
  lcd.backlight();// bat den nen lcd
  introScreen(); // goi ham introScreen() de hien thi 
  delay(200); // tre 0,2s
  // lcd.print("Hello");
  //------------------
  // khoi tao chan led, button o  trang thai output,input tuong ung, va cac led dang tat
  pinMode(purpleLed, OUTPUT);
  pinMode(purpleButton, INPUT);
  digitalWrite(purpleLed, LOW);

  pinMode(redLed, OUTPUT);
  pinMode(redButton, INPUT);
  digitalWrite(purpleLed, LOW);

  pinMode(whiteLed, OUTPUT);
  pinMode(whiteButton, INPUT);
  digitalWrite(purpleLed, LOW);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass); // co gang ket noi voi blynk server theo cau hinh tuong ung
}
void loop() {
  //  Serial.println(digitalRead(button));
  // }
  //---------------------------------
  // neu mat khau dung, thi goi ham grantAccess() con khong thi tiep tuc goi ham checkCode()
   if (!codeEntered) {
      checkCode();
    }
    else {
      grantAccess();
    }
  //------------------
  // doc lien tuc gia tri cua button , neu co thay doi, thay doi trang thai led
  buttonsauPurple = digitalRead(purpleButton);
  delay(70);
  if (digitalRead(purpleButton) != buttonsauPurple) {
    digitalWrite(purpleLed, !digitalRead(purpleLed)); // dao trang thai led hien tai
    delay(50);
  }
  buttonsauRed = digitalRead(redButton);
  delay(70);
  if (digitalRead(redButton) != buttonsauRed) {
    digitalWrite(redLed, !digitalRead(redLed)); // dao trang thai led hien tai
    delay(50);
  }
  buttonsauWhite = digitalRead(whiteButton);
  delay(70);
  if (digitalRead(whiteButton) != buttonsauWhite) {
    digitalWrite(whiteLed, !digitalRead(whiteLed)); // dao trang thai led hien tai
    delay(50);
  }
    Blynk.run(); // lay gia tri tu blynk server
}
// lay gia tri tu blynk server va dat trang thai led tuong ung 0:tat, 1 : bat
BLYNK_WRITE(V0) {
  p1 = param.asInt();
  digitalWrite(purpleLed, p1);
  delay(100);
}
// lay gia tri tu blynk server va dat trang thai led tuong ung 0:tat, 1 : bat
BLYNK_WRITE(V1) {
  p2 = param.asInt();
  digitalWrite(redLed, p2);
  delay(100);
}
// lay gia tri tu blynk server va dat trang thai led tuong ung 0:tat, 1 : bat
BLYNK_WRITE(V2) {
  p3 = param.asInt();
  digitalWrite(whiteLed, p3);
  delay(100);
}
//// lay gia tri tu blynk server va dat trang thai servo tuong ung 0:dong cua, 1 : mo cua
BLYNK_WRITE(V3) {
  p4 = param.asInt();
  if(p4 == 1) {
    servo.write(180);
    delay(500);
    servo.write(90);
    delay(500);
  } else {
    servo.write(90);
    delay(500);
  }

}
void checkCode() {
  char key = keypad.getKey(); // lay gia tri nhap tu keypad
  if (key != NO_KEY) { // neu la key
    pwd += key; // noi key vao password
    lcd.setCursor(n, 1); // set vi tri hien thi
    lcd.print("*"); // hien thi dau * thay vi key
    n++;
  }
  if (n == 4) { // neu du 4 gia tri thi check xem password == "1111" khong

    if (pwd.equalsIgnoreCase(password)) {
      codeEntered = true; // dung thi thi set tragn thai codeEntered = true de mo cua
    } else {
      lcd.setCursor(0, 0); // set vi tri de hien thi chu "Mat khau sai" h1c1
      lcd.print("Mat khau sai"); // hien thi chu
      resetPwd++;  // so lan go mk tang len
      if(resetPwd == 4){ // qua 4 lan go mk sai thi thong bao go sai, bat cho 10s de co the go tiep
        lcd.clear(); 
        lcd.setCursor(0,0);
        lcd.print("Thu lai sau 5s");
        delay(7000); // cho 10s
        resetPwd = 0;// dat so lan go sai password ve 0 de co the tiep tuc nhap
      }
      lcd.setCursor(0, 1);
      lcd.print("Nhap lai mkhau"); // nhap lai mat khau
      delay(500);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Nhap mat khau"); // nhap mat khau
      lcd.setCursor(0, 1);

      pwd = ""; // pwd ve chuoi rong de nhap lai
    }
    n = 0; // set gia tri do dai mk ve 0 de nhap lai
  }
}
void grantAccess() { // ham mo cua
  lcd.setCursor(0, 0);
  lcd.print("Mat khau dung");
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Wel come");
  codeEntered = false; // setcodeEntered ve khong de nguoi khac co the mo
  pwd = ""; // set pwd ve rong de nhap pass lai
  delay(200);
  servo.write(180); // mo cua
  delay(500);
  servo.write(90); // dong cua
  delay(500);
}
void introScreen() { // hien thi nhung trang thai ban dau
  lcd.clear();
  lcd.setCursor(3, 0);
  lcd.print("Smart Home");
  lcd.setCursor(2, 1);
  lcd.print("Welcome back");
  delay(600);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Nhap mat khau");
  lcd.setCursor(0, 1);
}