#include<iostream>
#include<fstream>
#include<ctype.h>
#include<stdio.h>
#include<string.h>
#include<process.h>
using namespace std;
class bookentery
{
	int bookno;
	char name[30];
	char auth[20];
	int price;
	int quantity;
	int no_issued;
public:
	int booknoass();
	void get();
	void disp();
	void wtf();
	void rff();
	int searchf();
	friend void issue();
	void ret();
	void del (char n[30]);
	void mod();


}book;
int bookentery::booknoass()
{
	int no=0;
	ifstream ifile1;
	ifile1.open("book_list");
	int a=ifile1.tellg();
	a=a-sizeof(book);
	ifile1.seekg(a,ios::end);
	ifile1.read((char*)&book,sizeof(book));
	no=bookno;
	no++;
	ifile1.close();
	return no;
}
void bookentery :: get()
	{
		cout<<"\nBOOK NUMBER";
	 	bookno=booknoass();
		cout<<bookno<<endl;
		cout<<"\nNAME OF THE BOOK";
		cin>>name;
		cout<<"\nNAME OF THE AUTHOR";
		cin>>auth;
		cout<<"\nPRICE OF THE BOOK\n";
		cin>>price;
		cout<<"\nNOI. OF COPIES ADDED";
		cin>>quantity;
		cout<<"\nNO OF COPIES ISSUED";
		cout<<"\n"<<no_issued<<"\n";
	}
    void bookentery :: disp()
	{
		cout<<"\nBOOK NUMBER\n";
		cout<<bookno;
		cout<<"\nNAME OF THE BOOK\n";
		cout<<name;
		cout<<"\nNAME OF THE AUTHOR\n";
		cout<<auth;
		cout<<"\nPRICE OF THE BOOK\n";
		cout<<price;
		cout<<"\nNO. OF COPIES ADDED\n";
		cout<<quantity;
		cout<<"\nNO OF COPIES ISSUED\n";
		cout<<no_issued;
		cout<<endl<<endl<<endl;
	}
    void bookentery :: wtf()
	{
		ofstream ofile1;
		ofile1.open("book_list",ios::app);
		get();
		ofile1.write((char*)&book,sizeof(book));
		ofile1.close();
	}
	void bookentery :: rff()
	{
		ifstream ifile1;
		ifile1.open("book_list");
		ifile1.seekg(0,ios::beg);
		ifile1.read((char*)&book,sizeof(book));
		while(ifile1)
		{
			disp();
			ifile1.read((char*)&book,sizeof(book));
		}
		ifile1.close();
	}
	int bookentery :: searchf()
	{
		char search[30];
		int flag=0;
		int ch;
		ifstream ifile1;
		ifile1.open("book_list");
		ifile1.seekg(0,ios::beg);
		cout<<"search by author -1 \n by name of book -2";
		cin>>ch;
		if(ch==1)
		{cout<<"enter name of author";
		cin>>search;
		while(ifile1)
		{
			ifile1.read((char*)&book,sizeof(book));
			if(strcmpi(auth,search)==0)
			{
				{
					flag=1;
					break;
				}
			}
		}
		if(flag)
		{
			cout<<"FOUND";
			disp();
			return 1;
		}
		else
		{cout<<"not found";
		return 0;}
		}
		else if(ch==2)
		{cout<<"enter name of book";
		cin>>search;
		while(ifile1)
		{
			ifile1.read((char*)&book,sizeof(book));
			if(strcmpi(name,search)==0)
			{
				{
					flag=1;
					break;
				}
			}
		}
		if(flag)
		{
			cout<<"FOUND";
			disp();
			return 1;
		}
		else
		{
			cout<<"not found";
		return 0;
		}
		}

		ifile1.close();
	}
	void bookentery :: del (char n[30])
	{
		ifstream ifile;
		ifile.open("book_list");
		ofstream ofile;
		ofile.open("temp",ios::app);
		ifile.seekg(0,ios::beg);
		ifile.read((char*)&book,sizeof(book));
		while(ifile)
		{
			if(strcmpi(n,name))
				ofile.write((char*)&book,sizeof(book));
			ifile.read((char*)&book,sizeof(book));
		};
		ifile.close();
		ofile.close();
		remove("book_list");
		rename("temp","book_list");
	}



void bookentery :: ret()
	{
		fstream f;
		char n[20];
		cout<<"name of the book to be returned";
		cin>>n;
		f.open("book_list",ios::in|ios::out);
		f.seekg(0,ios::beg);
			f.read((char*)&book,sizeof(book));
			int a=f.tellg();
		while(!f.eof())
		{
			if(strcmpi(n,name)==0)
			{
				no_issued--;
				f.seekp(a-sizeof(book));
				f.write((char*)&book,sizeof(book));
			}
			f.read((char*)&book,sizeof(book));
		 a=f.tellg();
		}
		f.close();
	}
void bookentery::mod()
{
		fstream f;
		char n[20];
		cout<<"name of the book to be modified";
		cin>>n;
		f.open("book_list",ios::in|ios::out);
		f.seekg(0,ios::beg);
		f.read((char*)&book,sizeof(book));
		int a=f.tellg();
		while(!f.eof())
		{
			if(strcmpi(n,name)==0)
			{
				get();
				f.seekp(a-sizeof(book));
				f.write((char*)&book,sizeof(book));
			}
			f.read((char*)&book,sizeof(book));
		 a=f.tellg();
		}
		f.close();
}
class student
{
	char name[20];
	char phno[20];
	char add[50];
	int admno;
	int cardno;
	char bookissued [3][50];
	int noissued;
public:
	void disp();
	void get();
	friend void issue();
	void wtf();
	void rff();
	int searchf();
}stud;
void issue()
	{
		char search[30];
		int flagb=0;
		int ch;
		ifstream ifile1;
		ifile1.open("book_list");
		ifile1.seekg(0,ios::beg);
		cout<<"search by author -1 \n by name of book -2";
		cin>>ch;
		if(ch==1)
		{cout<<"enter name of author";
		cin>>search;
		ifile1.read((char*)&book,sizeof(book));
		while(ifile1)
		{

			if(strcmpi(book.auth,search)==0)
			{
				{
					flagb=1;
					break;
				}
			}
			ifile1.read((char*)&book,sizeof(book));
		}
		if(flagb)
		{
			cout<<"FOUND";

		}
		else
		{cout<<"not found";
//		return 0;}
		}
		}
		else if(ch==2)
		{cout<<"enter name of book";
		cin>>search;
		ifile1.seekg(0,ios::beg);
		while(ifile1)
		{
			ifile1.read((char*)&book,sizeof(book));
			if(strcmpi(book.name,search)==0)
			{
				{
					flagb=1;
					break;
				}
			}
		}
		if(flagb)
		{
			cout<<"FOUND";
		}
		else
		{
			cout<<"not found";

		}
		}
		int flags=0;
		ifstream ifile2;
		ifile2.open("student");
		char namestud[20];
		cout<<"enter name of student";
		cin>>namestud;
		ifile2.seekg(0,ios::beg);
		while(ifile2)
		{
			ifile2.read((char*)&stud,sizeof(stud));
			if(strcmpi(namestud,stud.name)==0)
			{
				{
					flags=1;
					break;
				}
			}
		}
		int b=ifile1.tellg();
		int s=ifile2.tellg();
		ifile1.close();
		ifile2.close();
		if(flags)
		{
			cout<<"FOUND";

		}
		else
		{cout<<"not found";
		}
		if(stud.noissued>=3)
		{
			flags=0;
		}
		if(book.no_issued==book.quantity)
		{
			flagb=0;
		}
			fstream file1;
			fstream file2;
			cout<<flagb<<flags;
		if((flagb==1)&&(flags==1))
		{

			file1.open("student",ios::out|ios::in);
			file2.open("book_list",ios::out|ios::in);
			file1.seekg(s-sizeof(stud),ios::beg);
			file2.seekg(b-sizeof(book),ios::beg);
			file1.read((char*)&stud,sizeof(stud));
			file2.read((char*)&book,sizeof(book));
			book.no_issued++;
			stud.noissued++;
			cout<<"issued";
			strcpy(stud.bookissued[stud.noissued-1],search);
			file1.seekp(s-sizeof(stud),ios::beg);
			file2.seekp(b-sizeof(book),ios::beg);
			file1.write((char*)&stud,sizeof(stud));
			file2.write((char*)&book,sizeof(book));
		}
			file1.close();
			file2.close();

		}
void student :: disp()
	{
		cout<<"\nNAME";
		cout<<name;
		cout<<"\nPHNO";
		cout<<phno;
		cout<<"\nADDRESS";
		cout<<add;
		cout<<"\nCARD NO";
		cout<<cardno;
		cout<<"\nNo. of books issued";
		cout<<noissued;
		cout<<"\nBooks issued\n";
		cout<<bookissued[0]<<endl<<bookissued[1];//<<endl<<bookissued[2]<<endl;

	}
	void student :: get()
	{
		cout<<"\nNAME";
		cin>>name;
		cout<<"\nPHNO";
		cin>>phno;
		cout<<"\nADDRESS";
		cin>>add;
		cout<<"\nCARD NO";
		cin>>cardno;
		noissued=0;
	}
	void student :: wtf()
	{
		ofstream ofile;
		ofile.open("student",ios::app);
		get();
		ofile.write((char*)&stud,sizeof(stud));
		ofile.close();
	}
	void student :: rff()
	{
		ifstream ifile;
		ifile.open("student");
		ifile.seekg(0,ios::beg);
		ifile.read((char*)&stud,sizeof(stud));
		while(ifile)
		{
			disp();
			ifile.read((char*)&stud,sizeof(stud));
		}
		ifile.close();
	}
    int student :: searchf()
	{
		int flag=0;
		ifstream ifile1;
		char namestud[20];
		cout<<"enter name of student";
		cin>>namestud;
		while(ifile1)
		{
			ifile1.read((char*)&stud,sizeof(stud));
			if(strcmpi(namestud,name)==0)
			{
				{
					flag=1;
					break;
				}
			}
		}
		if(flag)
		{
			cout<<"FOUND";
			disp();
			return 1;
		}
		else
		{cout<<"not found";
		return 0;
		}
		}

int main()
{
	char namebook[20];
	int c;

a:
cout<<"\n************************MAIN MENU***************************";
cout<<"\n1.LIBRARIAN";
cout<<"\n2.STUDENT";
cout<<"\n3.DELETE ALL DATA";
cout<<"\n4.EXIT";
cout<<"\nEnter ur category\t";
cin>>c;

if(c==3)
{
	int a;
	cout<<"for student press 1\n";
	cout<<"for books press 2\n";
	cin>>a;
	if(a==1)
	{
		ofstream ofile;
		ofile.open("student",ios::trunc);
		ofile.close();
	}
	else if(a==2)
	{
		ofstream ofile1;
		ofile1.open("book_list",ios::trunc);
		ofile1.close();
	}
}
if((c!=1)&&(c!=2)&&(c!=3)&&(c!=4))
{
	cout<<"wrong choice";
	goto a;
}
int readwrite=0;
while (c==1)
{
cout<<"\nenter 1 to read records enter 2 to write,3 to search,4 to delete,5 to issue,6 to return,7 to mod";
cin>>readwrite;
	if(readwrite==2)
	book.wtf();
	else if(readwrite==1)
	book.rff();
	else if(readwrite==3)
	book.searchf();
	else if(readwrite==4)
	{cout<<"enter name of book to be deleted";
	cin>>namebook;
	book.del(namebook);}
	else if(readwrite==5)
	issue();
	else if(readwrite==6)
	book.ret();
	else if(readwrite==7)
		book.mod();
	else
	cout<<"wrong choice";
	cout<<"enter 1 to continue as libranian";
	cin>>c;
	if(c!=1)
		goto a;
}

while(c==2)
{
cout<<"\nenter 1 to read records enter 2 to write,3 to search";
cin>>readwrite;
	if(readwrite==2)
	stud.wtf();
	else if(readwrite==1)
    stud.rff();
	else if(readwrite==3)
	{stud.searchf();}
	else
	cout<<"wrong choice";
	cout<<"enter 2 to continue as student";
	cin>>c;
	if(c!=2)
		goto a;
}
return 0;
}