#include <iostream>
#include <ctime>
#include <cstdlib>
#include <fstream>
#include <cstring>

using namespace std;

 

struct  DATE {

	int mday, mon, year, hour, min;
	
};

inline void eatline() 
{ 
	while (cin.get() != '\n') 
		continue; 
}

class airlineReservation {
	
public:
	airlineReservation();
	airlineReservation(int rn, char *dept, char *dest, int fca, int fcs, int csa, int css, DATE deptT, DATE arvT);
	DATE AssingArrvDT(int mday, int mon, int year, int hour, int min );
	DATE AssingDeptDT(int mday, int mon, int year, int hour, int min );
	void DisplayDeptDT();
	void DisplayArrvDT();
	
	void CreateReservation();
	void DisplayReservation();
	
	void ReadFromFile();
	void WriteToFile(airlineReservation& a);
	void UpdateReservation();
	void DeleteReservation();
	
	airlineReservation& Reserve();
	
	airlineReservation& operator=(airlineReservation& a);
	
	
private:
	DATE  AssignTarih(int mday, int mon, int year, int hour, int min );

	 
	int m_flightNumber;
	char m_departureCity[20];
	char m_destinationCity[20];
	int m_firstClassSeatsAv;
	int m_firstClassSeatsSold;
	int m_coachSeatsAv;
	int m_coachSeatsSold;
	DATE m_departureTime;
	DATE m_arrivalTime;
	
	 
};


airlineReservation& airlineReservation::Reserve()
{
		 
	int day, month, year, hour, min;
	
	cout << "Enter Flight Number\n";
	cin >>   m_flightNumber;
	
	cin.ignore();
	cout << "Enter Departure City\n";
	cin.getline(  m_departureCity, 20);
	 
	cout << "Enter Arrival City\n";
	cin.getline(  m_destinationCity, 20);
	 
	cout << "Enter Departure Date ( dd mm yyyy)\n";
	cin >> day >> month >> year;
	
	cout << "Enter Departure Time (hh min)\n";
	cin >> hour >> min;
	
	 m_departureTime = AssingDeptDT(day, month, year, hour, min);
	
	cout << "Enter Arrival Date ( dd mm yyyy)\n";
	cin >> day >> month >> year;
	
	cout << "Enter Arrival Time (hh min)\n";
	cin >> hour >> min;
	
	 m_arrivalTime = AssingArrvDT(day, month, year, hour, min);
	
	cout << "Enter First Class seats available\n";
	cin >>  m_firstClassSeatsAv;

	cout << "Enter First Class seats sold\n";
	cin >>  m_firstClassSeatsSold;
	
	cout << "Enter Coach Seats available\n";
	cin >>	  m_coachSeatsAv;
	
	cout << "Enter Coach Seats sold\n";
	cin >> m_coachSeatsSold;
	
	 
	
	return *this;
}
	
airlineReservation::airlineReservation()
{
	cout << "Constructor\n";
	
	 
}

airlineReservation::airlineReservation(int rn, char *dept, char *dest, int fca, int fcs, int csa, int css, DATE deptT, DATE arvT)
{
	m_flightNumber = rn;
	strcpy(m_departureCity, dept);
	strcpy(m_destinationCity, dest);
	m_firstClassSeatsAv = fca;
	m_firstClassSeatsSold = fcs;
	m_coachSeatsAv = csa ;
	m_coachSeatsSold = css;
	m_departureTime = deptT;
	m_arrivalTime = arvT ;
	
}
 	
airlineReservation& airlineReservation::operator=(airlineReservation& a)
{
	cout << "my copy const\n";
	m_flightNumber = a.m_flightNumber ;
	strcpy(m_departureCity, a.m_departureCity);
	strcpy(m_destinationCity, a.m_destinationCity);
	m_firstClassSeatsAv = a.m_firstClassSeatsAv;
	  m_firstClassSeatsSold = a. m_firstClassSeatsSold;
	  m_coachSeatsAv = a.m_coachSeatsAv;
	  m_coachSeatsSold = a.m_coachSeatsSold;
	m_departureTime.mday = a.m_departureTime.mday;
	m_departureTime.mon = a.m_departureTime.mon;
	m_departureTime.year = a.m_departureTime.year;
	m_departureTime.hour = a.m_departureTime.hour;
	m_departureTime.min = a.m_departureTime.min;
	
	m_arrivalTime.mday = a.m_arrivalTime.mday;
	m_arrivalTime.mon = a.m_arrivalTime.mon;
	m_arrivalTime.year = a.m_arrivalTime.year;
	m_arrivalTime.hour = a.m_arrivalTime.hour;
	m_arrivalTime.min = a.m_arrivalTime.min;
	
	return  *this;
} 
	
DATE  airlineReservation::AssignTarih(int mday, int mon, int year, int hour, int min )
{
	DATE t;
	t.mday = mday;
	t.mon = mon;
	t.year = year;
	t.hour = hour;
	t.min = min;
	
	return t;
}
	
DATE  airlineReservation::AssingArrvDT(int mday, int mon, int year, int hour, int min )
{
	m_arrivalTime  = AssignTarih(mday, mon, year, hour, min);
 
	return m_arrivalTime;
}
 
void airlineReservation::DisplayArrvDT()
{
	cout << m_arrivalTime.mday << "." << m_arrivalTime.mon << "." << m_arrivalTime.year << "\n";
	cout << m_arrivalTime.hour << ":" << m_arrivalTime.min << "\n";
}
DATE airlineReservation::AssingDeptDT(int mday, int mon, int year, int hour, int min )
{
	m_departureTime  = AssignTarih(mday, mon, year, hour, min);
	return m_departureTime; 
}
 
void airlineReservation::DisplayDeptDT()
{
	cout << m_departureTime.mday << "." << m_departureTime.mon << "." << m_departureTime.year << "\n";
	cout << m_departureTime.hour << ":" << m_departureTime.min << "\n";
}		

void airlineReservation::CreateReservation()
{
	 
	airlineReservation  temp;
	
	temp = Reserve();
	
	WriteToFile(temp);
	
}



void airlineReservation::WriteToFile(airlineReservation &a)
{
	
	fstream f("hadebakalim.txt",  ios::binary | ios::out | ios::app  );

	if (!f)
	{
		cerr << "cannot write\n";
		system("PAUSE");
		exit(1);
	}
	
	f.write(reinterpret_cast<char *> (&a), sizeof(airlineReservation));
	
}

void airlineReservation::ReadFromFile()
{
	airlineReservation a;
	
	int i = 1;
	fstream f("hadebakalim.txt", ios::in  | ios::binary  );
	while(f.read(reinterpret_cast<char *> (&a), sizeof(a)))
	{
		cout << "\n\n\nrecord" << i <<" :....\n\n";
		a.DisplayReservation();
		i++;
	}
}

void airlineReservation::UpdateReservation()
{
	airlineReservation a, temp;
	int resNo;
	char press;
	
	ReadFromFile();

	cout << "enter the record number of the reservation to update...\n";

	cin >> resNo;
	eatline();
	
	streampos place = (resNo - 1) * sizeof(airlineReservation);
	
	fstream f("hadebakalim.txt", ios::out  | ios::binary  | ios::in);
	f.seekg(place);
	
	f.read(reinterpret_cast<char *> (&a), sizeof(a));
	cout << "Your record to update is...\n";
	a.DisplayReservation();
	
	
	cout << "\nUpdate is Starting...\nPress Y to continue, or N to exit...\n";
	cin >> press;
	
	
	if (press == tolower('y'))
	{
		temp = Reserve(); 
		
		f.seekp(place);
		f.write(reinterpret_cast<char *> (&temp), sizeof(temp)) << flush;
		
		cout << "\nthe updated record is...\n";
		temp.DisplayReservation();
	}
	else if (press == tolower('n'))
	{
		cout << "\nexiting...\n";
		exit(0);
	}
	else
	{
		cerr << "\nnon defined key.. exiting.\n";
		exit(1);
	}
		
}

void airlineReservation::DeleteReservation()
{
	//is not working... try again...
	
	airlineReservation a ;
	int resNo;
	char press;
	
	ReadFromFile();

	cout << "enter the record number of the reservation to delete...\n";

	cin >> resNo;
	eatline();
	
	streampos place = ((resNo - 1) * sizeof(airlineReservation));
	
	fstream f("hadebakalim.txt", ios::out  | ios::binary  | ios::in);
	f.seekg(place);
	
	f.read(reinterpret_cast<char *> (&a), sizeof(a));
	cout << "Your record to delete is...\n";
	a.DisplayReservation();
	
	
	cout << "\ndelete is Starting...\nPress Y to continue, or N to exit...\n";
	cin >> press;
	
	
	if (press == tolower('y'))
	{
		 
		
		f.seekp(place);
		f.write(reinterpret_cast<char *> (&a),  sizeof(a)) << flush;
		
		cout << "\nthe record is deleted...\n";
		 
	}
	else if (press == tolower('n'))
	{
		cout << "\nexiting...\n";
		exit(0);
	}
	else
	{
		cerr << "\nnon defined key.. exiting.\n";
		exit(1);
	}
}
	

void airlineReservation::DisplayReservation()
{
	cout << "Flight Number:" << m_flightNumber <<"\n";
	cout << "Departure City:" << m_departureCity << "\n";
	cout << "Destination City:" << m_destinationCity << "\n";
	
	cout << "Date  and time of Departure\n";
  	cout << m_departureTime.mday << "." << m_departureTime.mon << "." << m_departureTime.year << "  Time - ";
	cout << m_departureTime.hour << ":" << m_departureTime.min << "\n";
	
	cout << "Date and time of Arrival\n";
	cout << m_arrivalTime.mday << "." << m_arrivalTime.mon << "." << m_arrivalTime.year << "  Time - ";
	cout << m_arrivalTime.hour << ":" << m_arrivalTime.min << "\n";

	cout << "Number of first class seats available: ";
	cout << m_firstClassSeatsAv;
	
	cout << "\nNumber of first class seats sold: ";
	cout << m_firstClassSeatsSold;
	
	cout << "\nNumber of coach seats available: ";
	cout << m_coachSeatsAv;
	
	cout << "\nNumber of first class seats available: ";
	cout << m_coachSeatsSold << endl;
	
}

 



int main()
{
	 	
	airlineReservation res;
	 
	 
   //res.CreateReservation();
	//cout << "reading........";
	//res.DisplayReservation();
	//res.ReadFromFile();
	//res.UpdateReservation();
	  //res.DeleteReservation();
	system("PAUSE");
	return 0;
}