#include <Keypad.h>
#include <textBuff.h>
#include <timeObj.h>
#include <resizeBuff.h>

#define PASSCODE        "21137020"
#define UNLOCK_LED_PIN  10
#define ROWS             4
#define COLS             4
#define NUM_CHARS       80
#define ERROR_MS        500
#define PASS_MS         5000
#define BEEPER_PIN      11
#define CLICK_FREQ      600
#define CLICK_FREQ_MS   25
#define UNLOCK_FREQ     800
#define UNLOCK_FREQ_MS  100
#define ERROR_FREQ      100
#define ERROR_FREQ_MS   500

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

Keypad    keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
textBuff  ourMsg(NUM_CHARS);
bool      locked;
bool      badStr;
timeObj   badStrTimer(ERROR_MS,false);
timeObj   lockTimer(PASS_MS,false);

void setup() {
  Serial.begin(9600);
  locked = false;
  badStr = false;
  pinMode(UNLOCK_LED_PIN,OUTPUT);
  Serial.println("Enter password ");
  Serial.println("press # to unlock");
}

void checkStr(void) {
  char* passStr;
  passStr = ourMsg.readStr();
  ourMsg.clear();
  if (!strcmp(PASSCODE,passStr)) {
    unlock();
  } else {
    showError();
  }
}

void lock(void) {
  locked = true;
  lockTimer.reset();
  Serial.println("Relocking.");
}

void unlock(void) {
  locked = false;
  lockTimer.start();
  Serial.println("Success!");
  tone(BEEPER_PIN, UNLOCK_FREQ, UNLOCK_FREQ_MS);
}

void showError(void) {
  badStr = true;
  badStrTimer.start();
  Serial.println("!!!!!!!entered password is incorrect!!!!");
  tone(BEEPER_PIN, ERROR_FREQ, ERROR_FREQ_MS);
}

void clearError(void) {
  badStr = false;
  badStrTimer.reset();
}

void loop() {
  char  key;
  Serial.println("Loop");
  key = keypad.getKey();
  if (key != NO_KEY) {
    tone(BEEPER_PIN, CLICK_FREQ, CLICK_FREQ_MS);
    if (key=='#') {
      Serial.println();
      checkStr();
    } else {
      Serial.print(key);
      ourMsg.addChar(key);
    }
  }
  if (!locked && lockTimer.ding()) {
    lock();
  }
  if (badStr && badStrTimer.ding()) {
    clearError();
  }
  digitalWrite(UNLOCK_LED_PIN,!locked);
}