#include <ioavr.h>
#include <intrinsics.h>
#include <string.h>
#define E 0
#define RS 1
#define LCDPORT PORTC
#define LCDCTRL PORTB
#define delayTime 3000
#define TRUE 1
#define FALSE 0

//lcd ctrl portb, lcd data porte, buttons portd,leds porta

//global variables declarations
unsigned char savedPassword[4] = {'2','2','4','1'};
unsigned char temporaryPassword[4] = {'0','0','0','0'};
unsigned char password[4]={ '0','0','0','0'};
int userPasswordSize =0;
int isDisplayCleared = 0;
int changeOfPassword = FALSE;
volatile int pasnum =0;
int attempt =0;
int pastemp =0;
volatile int state =0;
int isMessageSent = TRUE;
int wasButtonPressed = FALSE;
int time =0;
int unlockTime = 0;
int isDoorUnlocked = FALSE;
int buttonTimer;


//functions declarations
void initialize();
void send(unsigned char data);
void displayWelcomeMessage();
void displayString(unsigned char* data);
void setpassword(unsigned char passdata);
void checkCorrectness();
void resetSettings();
void setUserPassword();
void isMessageOnScreen();
void initSettingsReset();
void blockedTerminal();
void changePassword(unsigned char passdata);
void saveEnteredPassword();







int main( void )
{
  initialize();
  initSettingsReset();

  while(1)
  {

  }

  return 0;
}
void initialize()
{
  //Ports initialization
  DDRB =  255;
  DDRC =  255;
  DDRD = 0x00;
  DDRA = 0xFF;

  //Lcd initialization
  LCDCTRL &= ~(1<<RS);
  send(0x38);
  send(0x06);
  send(0x0f);
  send(0x01);
  __delay_cycles(120000);
  LCDCTRL |= (1<<RS);

  //Counters initialization
  TCCR1B |= (1<< CS12) | (0 << CS11) | (0<< CS10);
  TIMSK |= (1 << TOIE0)| (1 << TOIE1);

  TCCR0 |= (1 << CS00);
  TCNT0 = 0;



  // Interrupts initialization -->
  __enable_interrupt();

  EICRA |= (1<<ISC01);
  EICRA |= (1<<ISC11);
  EICRA |= (1<<ISC21);
  EICRA |= (1<<ISC31);

  EICRB |= (1<<ISC41);
  EICRB |= (1<<ISC51);
  EICRB |= (1<<ISC61);
  EICRB |= (1<<ISC71);

  EIMSK |= (1<<INT0);
  EIMSK |= (1<<INT1);
  EIMSK |= (1<<INT2);
  EIMSK |= (1<<INT3);
  EIMSK |= (1<<INT4);
  EIMSK |= (1<<INT5);
  EIMSK |= (1<<INT6);
  EIMSK |= (1<<INT7);

  // <--


  displayWelcomeMessage();
}
void clearDisplay()       //fucntion for clearing the display
{
  LCDCTRL &= ~(1<<RS);
  __delay_cycles(4000);

  send(0x01);
  __delay_cycles(12000);

  LCDCTRL |= (1<<RS);
  __delay_cycles(4000);

  isMessageSent = FALSE;
}

//TIMERS -->

#pragma vector = TIMER0_OVF_vect        //8 bit timer0, used for eliminations of button vibrations which genetrates unwatned input
__interrupt void buttonReset()
{
  if(buttonTimer <= delayTime)
  {
      buttonTimer++;
  }
}

#pragma vector = TIMER1_OVF_vect
 __interrupt void settingsResetAfterTime()    //16 nit timer1, one second cycle
 {
      TCNT1=36735;

      if(wasButtonPressed == TRUE)           //condition if button was pressed or not
      {                                      //if yes resets all seting after 3 seconds of inactivity
        time = time+1;
        if(time == 3)
        {
          resetSettings();
        }
      }
      if(isDoorUnlocked == TRUE)             //condition if user unclocked door or not
      {                                      //if yes door unlocked for 5 seconds (time set for faster testing)
                                             //after that time door are locked again
        unlockTime = unlockTime +1;
        if(unlockTime == 5)
        {
           resetSettings();
           displayString("DoorLocked");
           unlockTime = 0;
           isDoorUnlocked = FALSE;

        }

     }

 }

// <--


void send(unsigned char data)   //sending character on LCD
{
  LCDCTRL |= (1<<E);
  LCDPORT = data;
  __delay_cycles(400);
  LCDCTRL &= ~(1<<E);
  __delay_cycles(500);
}
void displayWelcomeMessage()
{
  displayString("Enter Password");
}
void displayString(unsigned char* data)          //sending whole string on display using previous function send
{
  for(int i = 0; i<(unsigned)strlen(data); i++)
  {
    send(data[i]);
  }
  isMessageSent = TRUE;
}
void setpassword(unsigned char passdata)        //function which saves password given by a user
{

  password[pasnum]= passdata;
  pasnum = pasnum +1;
  userPasswordSize = userPasswordSize +1;
}
void changePassword(unsigned char passdata)
{
    temporaryPassword[pastemp] = passdata;
    pastemp = pastemp +1;
}

void isMessageOnScreen()                        //checks if there is a message on screeen, if there is it clear display after pressing a button
{
    if(isMessageSent == TRUE)
      {
        clearDisplay();
        resetSettings();
      }
}

//Buttons declaration using inrerupts -->

#pragma vector = INT0_vect
__interrupt void button0(){     //button 0
  if(buttonTimer >= delayTime)
  {
     if(changeOfPassword == TRUE)
    {
      changePassword('0');
    }
    else
    {
        setpassword('0');
    }
                                //call function which assings proper charcter to an array for further chech with  password
    isMessageOnScreen();         //function which checks if there is any message on screen
    wasButtonPressed = TRUE;     //condition if button was pressed or not
    time =0;                     //reset timer
    send('0');                  //send '0' on the screen
    buttonTimer = 0;
  }
}
#pragma vector = INT1_vect
__interrupt void button1(){     //button 1
   if(buttonTimer >= delayTime)
  {
  if(changeOfPassword == TRUE)
    {
      changePassword('1');
    }
    else
    {
        setpassword('1');
    }
  isMessageOnScreen();
  wasButtonPressed = TRUE;
  time =0;
  send('1');                            //send '1' on the screen
  buttonTimer=0;
  }

}
#pragma vector = INT2_vect      //button 2
__interrupt void button2(){
  if(buttonTimer >= delayTime)
  {
    if(changeOfPassword == TRUE)
    {
      changePassword('2');
    }
    else
    {
        setpassword('2');
    }

  isMessageOnScreen();
  wasButtonPressed = TRUE;
  time =0;
  state =1;
  send('2');                            //send '2' on the screen

  buttonTimer =0;
  }
}
#pragma vector = INT3_vect      //button 3
__interrupt void button3(){
  if(buttonTimer >= delayTime)
  {
     if(changeOfPassword == TRUE)
    {
      changePassword('3');
    }
    else
    {
        setpassword('3');
    }

  isMessageOnScreen();
  wasButtonPressed = TRUE;
  time =0;
  state =1;
  send('3');                            //send '3' on the screen
  buttonTimer =0;
  }

 // password(4);
}
#pragma vector = INT4_vect      //button 4
__interrupt void button4(){
  if(buttonTimer >= delayTime)
  {
     if(changeOfPassword == TRUE)
    {
      changePassword('4');
    }
    else
    {
        setpassword('4');
    }

  isMessageOnScreen();
  wasButtonPressed = TRUE;
  time =0;
  state =1;
  send('4');                            //send '4' on the screen
  buttonTimer =0;
  }

}
#pragma vector = INT5_vect      //button 5
__interrupt void button5(){
  if(buttonTimer >= delayTime)
  {
    setUserPassword();
  }

}
#pragma vector = INT6_vect      //button ENTER
__interrupt void Enter(){
  if(buttonTimer >= delayTime)
  {
     if(changeOfPassword == TRUE)
    {
      saveEnteredPassword();
    }
    else
    {
      clearDisplay();
      wasButtonPressed = FALSE;
      checkCorrectness();
      buttonTimer =0;
    }

  }

}
#pragma vector = INT7_vect      //button  RESET
__interrupt void reset(){
  if(buttonTimer >= delayTime)
  {
  wasButtonPressed = TRUE;
   resetSettings();                     //call function which reset password
  buttonTimer =0;
  }
}

//<--
void setUserPassword()
{
    changeOfPassword = TRUE;
    displayString("Enter password");

}

void checkCorrectness()                 //checking is password is correct
{
  int wrongPassword = FALSE;
  if ( userPasswordSize != sizeof(savedPassword))    //if length of password given by user =/= length of saved password, then password is false
  {
      clearDisplay();
      PORTA= 0x00;
      wrongPassword = TRUE;
      displayString("Wrong Password");
  }
  else{
      for (int i = 0; i< sizeof(password);i++)
      {
            if(password[i] != savedPassword[i])      //if password given by user is not the same as saved one, then password is false
            {
              wrongPassword = TRUE;
            }
      }
  }
  if (wrongPassword == TRUE)                        //if password is false
  {
      clearDisplay();
      PORTA =0x00;                                  //all leds are turned on
      displayString("Wrong Password");            //Message that password was not correct
      attempt = attempt+1;
      //display attempts left;
  }
  else                                              //if password was correct
  {
    clearDisplay();
    PORTA = 0xAA;                                  //every second led is turned on
    displayString("Access Granted");               //message that we granted access beacuse password was correct
    isDoorUnlocked = TRUE;
    attempt =0;
  }
  if(attempt ==3)
  {
    clearDisplay();
    displayString("Terminal Blocked");
    blockedTerminal();
  }



}
void initSettingsReset()                          //function reseting all settings when program starts
{
   pasnum = 0;  //help variable which incremetns by pressing buttons, position in array
   PORTA = ~0x00; //Turn off all leds
   userPasswordSize = 0; //length of password given by user
   time = 0;              //timer 1 reset
   wasButtonPressed = FALSE;  //conditions if button was pressend or not

}
void resetSettings()  //resseting settings
{

  for(int i=0;i <sizeof(savedPassword);i++) //reseting whole array with password given by user
  {
      password[i]= '0';


  }
      isDoorUnlocked = FALSE;             //condition if door are unlocker or not
      clearDisplay();                     //clearing the display
      pasnum = 0;                         //help variable which incremetns by pressing buttons, position in array
      PORTA = ~0x00;                      //turn off all leds
      userPasswordSize = 0;               //number of characters given by user while entering the password
      if(wasButtonPressed == TRUE)
      {
        clearDisplay();
        wasButtonPressed = FALSE;
      }
      time = 0;                           //timer 1 reset

}
void blockedTerminal()
 {
   for(;;)
   {

   }
 }
void saveEnteredPassword()
{
    for(int i =0; i< sizeof(temporaryPassword); i++)
    {
        savedPassword[i] = temporaryPassword[i];

    }
    pastemp = 0;
    changeOfPassword = FALSE;
    buttonTimer=0;
}