#include <Keypad.h>
#include <Wire.h>
#include <DFPlayer_Mini_Mp3.h>
#include "SoftwareSerial.h"
SoftwareSerial mySerial(3, 12);
const int buzzerPin = A3;
# define Start_Byte 0x7E
# define Version_Byte 0xFF
# define Command_Length 0x06
# define End_Byte 0xEF
# define Acknowledge 0x00 //Returns info with command 0x41 [0x01: info, 0x00: no info]
# define ACTIVATED LOW
boolean isPlaying = false;

#define Password_Lenght 5 // Give enough room for six chars + NULL char
char Data[Password_Lenght]; // 4 is the number of chars it can hold + the null char = 5
char Master[Password_Lenght] = "1234";
byte data_count = 0, master_count = 0;
bool Pass_is_good;
char customKey;
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {11, 10, 9, 8}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {7, 6, 5, 4}; //connect to the column pinouts of the keypad
Keypad customKeypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS); //initialize an instance of class NewKeypad
int activate = 0;

void setup()
{
  pinMode(buzzerPin, OUTPUT);
  pinMode(A0, OUTPUT);
  pinMode(A1, OUTPUT);
  digitalWrite(A0, 1);
  digitalWrite(A1, 1);
  pinMode(activate, INPUT);
  Serial.begin(9600);
  mySerial.begin (9600);
  delay(1000);
  //playFirst();
  //mp3_pause ();
  isPlaying = false;
  mp3_set_serial (mySerial);  //set softwareSerial for DFPlayer-mini mp3 module
  mp3_set_volume (30);//18

  // Serial.println("Enter Password:");
}


void loop()
{
  if (digitalRead(2)) {
    //Please dont remove headset:
    mp3_play (1);
    delay (25000);
    //Please enter password:
    mp3_play (2);
    delay (14000);
    while (1) {
      passwordChk();
      if (activate == 1) {
        break;
      }
    }
    if (activate == 1) {
      // Send reset to Arduino 1 digitalWrite();
      activate = 0;
      delay(3000);
    }
  }


}// end of Loop

void clearData()
{
  while (data_count != 0)
  { // This can be used for any array size,
    Data[data_count--] = 0; //clear array for new data
  }
  return;
}

void passwordChk() {
  customKey = customKeypad.getKey();
  if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)
  {
    Data[data_count] = customKey; // store char into data array
    Serial.print(Data[data_count]); // print char at said cursor
    data_count++; // increment data array by 1 to store new char, also keep track of the number of chars entered
    buzz();
  }

  if (data_count == Password_Lenght - 1) // if the array index is equal to the number of expected chars, compare data to master
  {
    Serial.print("Password is ");

    if (!strcmp(Data, Master)) // equal to (strcmp(Data, Master) == 0)
    {
      // Pin is correct
      mp3_play (3);
      delay (19000);
      // payment of 50$ is accepted
      // Please put headset back
      activate = 1;
      digitalWrite(A0, 0);
      delay(1000);
      digitalWrite(A0, 1);
      digitalWrite(A1, 0);
      delay(1000);
      digitalWrite(A1, 1);
      Serial.println("Good");
      delay(1000);// added 1 second delay to make sure the password is completely shown on screen before it gets cleared.
      clearData();
    }
    else
    {
      // Pin is not Correct
      mp3_play (4);
      delay (15000);
      activate = 0;
      Serial.println("Bad");
      delay(1000);// added 1 second delay to make sure the password is completely shown on screen before it gets cleared.
      clearData();
    }


  }
}

void buzz() {
  digitalWrite(buzzerPin, 1);
  delay(100);
  digitalWrite(buzzerPin, 0);
  delay(50);
}