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#include<LiquidCrystal.h>
#include<Servo.h>

/* Initialize pins for Ultrasonic Distance Sensor */
const int trig_pin = 3;
const int echo_pin = 12;

/* Initialize Servo and Position */
Servo servo_9;
int pos = 0;

/* Initialize LCD display */
LiquidCrystal LCD(8, 2, 7, 6, 5, 4);

/* Variables for Ultrasonic Sensor */
long pulse_duration;
int distance_cm;

/* Initialize Button and Buzzer */
int buzzerPin = 13;
int buttonPin = 10;
int count = 0;
int buttonState = 0;      //Button press is 1 and opposite is 0
int lastButtonState = 0;  //Button press is 1 and opposite is 0
bool isInSecurityMode = false;

unsigned long buttonPressStartTime = 0;
unsigned long holdTime = 3000;

/* Security Feature */
unsigned long warningTime = 10000; 
unsigned long startTime = 0;

void setup() {
  /* Setup Servo */
  servo_9.attach(9, 500, 2500);
  
  /* Setup LCD to pins 8 to 2 */
  LCD.begin(8, 2);

  /* Setup I/O for Ultrasonic Sensor */
  pinMode(trig_pin, OUTPUT);
  pinMode(echo_pin, INPUT);

  /* Set I/O for Buzzer */
  pinMode(buzzerPin, OUTPUT);
  
  /* Set I for Button */
  pinMode(buttonPin, INPUT);
}

void loop(){
  swap_mode();
}

void swap_mode(){
  int readingState = digitalRead(buttonPin);

  /*when press then counting time*/
  if (readingState != lastButtonState) {
    buttonPressStartTime = millis();
  }

  /*If press button in 3 second then restart counting time*/
  if (readingState == 1 && (millis() - buttonPressStartTime) >= holdTime) {
    isInSecurityMode = !isInSecurityMode; // set variable to TRUE
    buttonPressStartTime = millis();
  }

  if (isInSecurityMode) { // if isInSecurity is TRUE then calling security mode else normal mode is enable
    security_mode();
  } else {
    normal_mode();
  }
}

void security_mode(){
  servo_9.write(0); // Close the door if in normal mode still open
  Init_trig_echo();
  shop_close();
  distance_cm = (pulse_duration*0.034)/2; //calculate distances is "cm"
  if(distance_cm < 30){
    warning();
    if (startTime == 0) {
      startTime = millis();
    }
    if(millis() - startTime >= warningTime){ // calculate time and compare with warning time.
      int count = 0;
      buzzer_power_on(count);
      count ++;
      imposter();
      buzzer_power_on(count);
      delay(5000); // delay 5s each session
      startTime = 0; // Restart the timer system
    }
  }else{
    startTime = 0;
    buzzer_power_off();
    see_you_again();
  }
  delay(1000);
}

void normal_mode(){
  Init_trig_echo();
  shop_open();
  LCD.setCursor(0,1);
  LCD.print("DOOR: "); // line 1 will display "DOOR: "
  distance_cm = (pulse_duration*0.034)/2;  // calculate distance are "cm"
  if(distance_cm < 60){
    LCD.print("   OPEN   ");    // and concat with "DOOR: "
    servo_9.write(170);   // servo will turn on with 170* when distance < 60
    delay(1000);  // delay 1s to wait object through
  }else{
    LCD.print("   CLOSE  ");  
    servo_9.write(0);   // servo will turn off with 0* when distance < 60
  }
}

/*Init the pins of trig and echo*/
void Init_trig_echo(){
  digitalWrite(trig_pin, LOW);
  delayMicroseconds(5);
  digitalWrite(trig_pin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig_pin,LOW);
  pulse_duration=pulseIn(echo_pin, HIGH);
}

/*when buzzer_power_on ended*/
void buzzer_power_off(){
  digitalWrite(buzzerPin, LOW);
}

/*Called when the object stands in the alarm for more than 10 seconds*/
void buzzer_power_on(int count){
  int n;
  if(count == 1){
    n = 15;
  }else{
    n = 3;
  }
  int duration = 200;
  for (int i = 0; i < n; i++) {
    tone(buzzerPin, 1000);
    delay(duration);
    noTone(buzzerPin);
    delay(duration);
  }
  noTone(buzzerPin);
}

/*Message for Shop in Security mode of line 2*/
void see_you_again(){
  LCD.setCursor(0,1);
  LCD.print(" SEE YOU AGAIN! ");
}

/* Message for warning when too close > 3 second */
void imposter(){
  LCD.setCursor(0,1);
  LCD.print(" HAVE IMPOSTERS ");
}

/*Message for warning when too close*/
void warning(){
  LCD.setCursor(0,1);
  LCD.print("Warn: Too Close");
}

/*Message for Shop Close*/
void shop_close(){
  LCD.setCursor(0,0);
  LCD.print(" GRP5 Shop CLOSE");
}

/*Message for Shop Open*/
void shop_open(){
  LCD.setCursor(0,0);
  LCD.print(" GRP5 Shop OPEN ");
}
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