#include <Wire.h>
#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Servo.h>
#include "SafeState.h"
#include "icons.h"

/* Locking mechanism definitions */
#define SERVO_PIN 6
#define SERVO_LOCK_POS   20
#define SERVO_UNLOCK_POS 90
#define ir_enter A5
#define ir_park A4
#define BUZ 13
int flag1=0, flag2=0;
Servo lockServo;
Servo myservo;

/* Display */
LiquidCrystal lcd(12, 11, 10, 9, 8, 7);

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

/* SafeState stores the secret code in EEPROM */
SafeState safeState;

void lock() {
  lockServo.write(SERVO_LOCK_POS);
  safeState.lock();
}

void unlock() {
  lockServo.write(SERVO_UNLOCK_POS);
}

void showStartupMessage() {
  lcd.setCursor(4, 0);
  lcd.print("Welcome!");
  delay(1000);

  lcd.setCursor(0, 4);
  String message =  "\t\t  PROJECT 1 \t\t";
  for (byte i = 0; i < message.length(); i++) {
    lcd.print(message[i]);
    delay(200);
  }
  delay(500);
}

String inputSecretCode() {
  lcd.setCursor(5, 1);
  lcd.print("[____]");
  lcd.setCursor(6, 1);
  String result = "";
  while (result.length() < 4) {
    char key = keypad.getKey();
    if (key >= '0' && key <= '9') {
      lcd.print('*');
      result += key;
    }
  }
  return result;
}

void showWaitScreen(int delayMillis) {
  lcd.setCursor(2, 1);
  lcd.print("[..........]");
  lcd.setCursor(3, 1);
  for (byte i = 0; i < 10; i++) {
    delay(delayMillis);
    lcd.print("=");
  }
}

bool setNewCode() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Enter new code:");
  String newCode = inputSecretCode();

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Confirm new code");
  String confirmCode = inputSecretCode();

  if (newCode.equals(confirmCode)) {
    safeState.setCode(newCode);
    return true;
  } else {
    lcd.clear();
    lcd.setCursor(1, 0);
    lcd.print("Code mismatch");
    lcd.setCursor(0, 1);
    lcd.print("Safe not locked!");
    delay(2000);
    return false;
  }
}

void showUnlockMessage() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(ICON_UNLOCKED_CHAR);
  lcd.setCursor(4, 0);
  lcd.print("Unlocked!");
  lcd.setCursor(15, 0);
  lcd.write(ICON_UNLOCKED_CHAR);
  delay(1000);
}

void safeUnlockedLogic() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(" # to Continue");
  

  bool newCodeNeeded = true;

  if (safeState.hasCode()) {
    lcd.setCursor(0, 1);
    lcd.print("  A = new code");
    newCodeNeeded = false;
  }

  auto key = keypad.getKey();
  while (key != 'A' && key != '#') {
    key = keypad.getKey();
  }

  bool readyToLock = true;
  if (key == 'A' || newCodeNeeded) {
    readyToLock = setNewCode();
  }

  if (readyToLock) {
    lcd.clear();
    lcd.setCursor(5, 0);
    lcd.write(ICON_UNLOCKED_CHAR);
    lcd.print(" ");
    lcd.write(ICON_RIGHT_ARROW);
    lcd.print(" ");
    lcd.write(ICON_LOCKED_CHAR);

    safeState.lock();
    lock();
    showWaitScreen(100);
  }
}

void safeLockedLogic() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.write(ICON_LOCKED_CHAR);
  lcd.print(" Safe Locked! ");
  lcd.write(ICON_LOCKED_CHAR);

  String userCode = inputSecretCode();
  bool unlockedSuccessfully = safeState.unlock(userCode);
  showWaitScreen(200);

  if (unlockedSuccessfully) {
    showUnlockMessage();
    unlock();
  } else {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Access Denied!");
    showWaitScreen(1000);
  }
}

void setup() {
   Serial.begin(9600);

  pinMode(ir_enter, INPUT);
  pinMode(ir_park, INPUT);
  pinMode(BUZ,OUTPUT);

  myservo.attach(1);
  myservo.write(90);

  lcd.begin(16, 2);
  init_icons(lcd);

  lockServo.attach(SERVO_PIN);

  
  Serial.begin(115200);
  if (safeState.locked()) {
    lock();
  } else {
    unlock();
  }

  showStartupMessage();
}

void loop() {

  if (safeState.locked()) 
  {
    safeLockedLogic();
  } else 
  {
    safeUnlockedLogic();
  }
  

  if(analogRead(ir_enter) == 0 && flag1 == 0 )
  {
    flag1=1;
    if(flag2==0)
    {
      myservo.write(180);
      delay(500);
      myservo.write(90);
    }
    flag1=0;

  }
  if(analogRead(ir_park) == 0 && flag2 == 0 )
  {
    flag2=1;
  }
  if(analogRead(ir_park) == 1 && flag2 == 1 )
  {
    flag2=0;
  }
  
  
  if(analogRead(ir_park) == 0 && analogRead(ir_enter) == 0 )

  {
    digitalWrite(BUZ, HIGH);
    delay(100);
    digitalWrite(BUZ, LOW);
    delay(200);
  }
}