// Electronic Safe      (C) 2020, Uri Shaked.    
// Eeprom.h испол-тся в SAFESTATE.cpp,хотя не инсталир-на!
#include <LiquidCrystal_I2C.h>  //
#include <Keypad.h>
#include <Servo.h>
#include "SafeState.h"  // stores the secret code in EEPROM 
#include "icons.h"

#define SERVO_PIN 6
#define SERVO_LOCK_POS   20
#define SERVO_UNLOCK_POS 90
Servo lockServo;

LiquidCrystal_I2C lcd(39, 16,2);    //LiquidCrystal  lcd(12, 11, 10, 9, 8, 7);
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 safeState; // SafeState stores the secret code in EEPROM 
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, 2);   String message = "ArduinoSafe v1.0";
for(byte i=0; i < message.length(); i++) {lcd.print(message[i]); delay(100); } 
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.write(ICON_UNLOCKED_CHAR);
  lcd.setCursor(2, 0);
  lcd.print(" # to lock");
  lcd.setCursor(15, 0);
  lcd.write(ICON_UNLOCKED_CHAR);

  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() {

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);

  lockServo.attach(SERVO_PIN);

  /* Make sure the physical lock is sync with the EEPROM state */
  Serial.begin(115200);
  if (safeState.locked()) {
    lock();
  } else {
    unlock();
  }

  showStartupMessage();
}

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