#include <LiquidCrystal.h> //needed to control LCD displays
#include <Keypad.h>

LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
int buzzer_pin = 6;
int motion_InPin = 5;
int mot_state = LOW;                  //initialized to no motion detected
int val = 0;                          //variable for reading the pin status
const unsigned long timeDelay = 1000;  //1000 for 1s
int alarmActive = 0;                  // suggestion: use bool instead of int

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

uint8_t colPins[COLS] = { 14, 15, 16, 17 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 4, 3, 2, 1 }; // Pins connected to R1, R2, R3, R4

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

void activate() {
  alarmActive = 1;
  // password.reset();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Alarm Activated in");
  lcd.setCursor(0, 1);
  lcd.print("10 seconds");
  int countDown = 9;
  //for (i == 0; i < 10; i++) {
  while (countDown != 0) {
    lcd.setCursor(0, 2);
    lcd.print(" ");
    lcd.print(countDown);
    countDown--;
    delay(700); //timeDelay
  }

  if (countDown == 0) {
    lcd.setCursor(0, 2);
    lcd.print(" ");
    lcd.print(countDown);
    alarm(true);
    //delay(3000);
    //alarm(false);
  }
}

void alarm(bool alarmStatus) {
  while(alarmStatus) {
    digitalWrite(buzzer_pin, HIGH);
    tone(6, 700, 200);
    delay(350);
  }
}

void setup() {
  lcd.begin(16, 2);
  pinMode(buzzer_pin, OUTPUT);
  pinMode(motion_InPin, INPUT);
  Serial.begin(9600);
}

char password = "5678";
char user_input[4];
int num_key = 0;

void loop() {
  //check_password();
  val = digitalRead(motion_InPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    //digitalWrite(ledPin, HIGH);  // turn LED ON
    if (mot_state == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      mot_state = HIGH;
      activate();
    }
  } else {
    //digitalWrite(ledPin, LOW); // turn LED OFF
    if (mot_state == HIGH) {
      // we have just turned off
      Serial.println("Motion ended!");
      mot_state = LOW;
    }
  }

}


void check_password() {
  while (num_key < 4) {
    char key = keypad.getKey();
    if (key != NO_KEY) {
      Serial.println(key);
      user_input[num_key] = key;
      num_key++;
  }
}
Serial.println(user_input);
Serial.println(password);
if( password == user_input) {
  Serial.println("CORRECT PASSWORD");
}
}


/*
int trigger_pin = 2;
int echo_pin = 3;
int buzzer_pin = 1;
int time;
int distance;

void setup() {
  Serial.begin(9600);
  pinMode(trigger_pin, OUTPUT);
  pinMode(echo_pin, INPUT);
  pinMode(buzzer_pin, OUTPUT);  

}

void loop() {
  digitalWrite(trigger_pin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger_pin, LOW);
  time = pulseIn(echo_pin, HIGH);
  distance = (time * 0.034) /2;

if (distance <= 100) {
  Serial.println("Too close, alarm triggered ");
  Serial.print(" Distance: ");
  Serial.println(distance);
  digitalWrite(buzzer_pin, HIGH);
  tone(6, 700, 200);
  delay(250);
  digitalWrite(buzzer_pin, HIGH);
  tone(6, 250, 200);
  delay(250);
}
else {
  Serial.println("Still quite far ");
  Serial.print(" Distance: ");
  Serial.println(distance);
  digitalWrite(buzzer_pin, LOW);
  delay(1000);
}

}
*/