#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <stdio.h>
#include <conio.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#include<iomanip>

using namespace std;
FILE* fl;


struct libr
{
	char name[10];
	char nazv[40];
	int age;
	int sheets;
}libb;

void stars();

void creating();
void filling(int* counting);
void reading(int* counting);
void checking(int* counting);
void in_file();
int menu();

int main()
{
	int counting = 0;//skolko mi zapisali

	cout << endl << "start" << endl;

	while (true)
	{
		switch (menu())
		{
			cout << "viberite:" << endl;
		case 1:creating();
			break;
		case 2: filling(&counting);
			break;
		case 3: reading(&counting);
			break;
		case 4: checking(&counting);
			break;
		case 5: in_file();
		case 6: return 0;
		default: "Viberete normalniy variant";
		}
	}
}

int menu()
{
	int i, pi = 0;
	cout << "1. Sozdanie" << endl;
	cout << "2. Zapiz" << endl;
	cout << "3. Pokazat'" << endl;
	cout << "4.Proverit'" << endl;
	cout << "5.V fail" << endl;
	cout << "6.Zakonchit;" << endl;
	int k; cin >> k;
	return k;
}

void stars()
{
	for (int i = 0; i < 50; i++)
	{
		cout << "*";
		++i;
	}
	cout << endl << endl;
}

void creating()//sozdanie faila
{
	if ((fl = fopen("test16.bin", "wb")) == NULL)
	{
		cout << "\nerror with creatin\n";
	}
	else
	{
		cout << endl << "sucs creating" << endl;
	}
}

void filling(int* counting)//vvod dannih v fail
{
	if ((fl = fopen("test16.bin", "ab+")) == NULL)
	{
		cout << "error with writing";
	}
	else
	{
		cout << endl << "File is redy to be filed" << endl << endl;
		char contin[3];

		do
		{
			++* counting;
			cout << "enter author: ";
			cin >> libb.name;
			cout << "enter nazvanie: ";
			cin >> libb.nazv;
			cout << "age of publish: ";
			cin >> libb.age;//проверка, чтобы год не было 2020+
			while (libb.age > 2020)
			{
				cout << "Error: neverniy god" << endl;
				cout << "age of publish : ";
				cin >> libb.age;
			}
			cout << "How many sheets: ";
			cin >> libb.sheets;

			fwrite(&libb, sizeof(libr), 1, fl); //writing

			cout << endl << endl << "contin? (1/0)" << endl;
			cin >> contin;

		} while (strcmp(contin, "1") == 0);
	}
	cout << endl << "Kol-vo zapisan avtorov: " << *counting << endl;
	fclose(fl);
}

void reading(int* counting)//vivod dannih iz faila
{
	if ((fl = fopen("test16.bin", "rb+")) == NULL)
	{
		cout << "error with reading";
	}
	else
	{
		cout << endl << "file is ready to read" << endl;

		for (int i = 0; i < *counting; i++)
		{
			stars();//funcia to krasiviy vivod
			fread(&libb, sizeof(libr), 1, fl);
			cout << "Athor: " << libb.name << endl;
			cout << "Nazvanie: " << libb.nazv << endl;
			cout << "Year: " << libb.age << endl;
			cout << "Sheets: " << libb.sheets << endl;
			stars();
		}

	}
	fclose(fl);
}

void checking(int* counting)
{
	int year;
	if ((fl = fopen("test16.bin", "rb+")) == NULL)
	{
		cout << "error with reading";
	}
	else
	{
		cout << endl << "Info is ready to be cheaked" << endl;
		cout << "Enter year posle which info should be shown: ";
		cin >> year;
		while (year > 2020)
		{
			cout << endl << "OLO god eshche ne nastupil" << endl;
			cout << "Vvedite normalniy god";
			cin >> year;
		}

		for (int i = 0; i < *counting; i++)
		{
			fread(&libb, sizeof(libr), 1, fl);
			if (libb.age > year)
			{
				stars();
				cout << "Athor: " << libb.name << endl;
				cout << "Nazvanie: " << libb.nazv << endl;
				cout << "Year: " << libb.age << endl;
				cout << "Sheets: " << libb.sheets << endl;
				stars();
			}
		}
	}
	fclose(fl);
}

void in_file()
{
	int year = 0;
	char ft_name[20];
	FILE* ft;
	int n = 0;
	cout << endl << "Vvedite nazvanie faila: ";
	cin >> ft_name;

	if ((ft=fopen(ft_name,"wb"))==NULL)
	{
		cout <<endl<< "error mistake with creating new file" << endl;
	}
	else
	{
		cout << endl << "file secs created" << endl;
	}
	if ((ft = fopen(ft_name, "rb+")) == NULL)
	{
		cout << endl << "error mistake with reading new file" << endl;
	}
	else
	{
		cout << endl << "file secs read" << endl;
	}
	n = filelength(fileno(fl)) / sizeof(libr);

	cout << "Enter year posle which info should be shown: ";
	cin >> year;
	while (year > 2020)
	{
		cout << endl << "OLO god eshche ne nastupil" << endl;
		cout << "Vvedite normalniy god";
		cin >> year;
	}

	for (int i = 0; i < n; i++)
	{
		fread(&libb, sizeof(libr), 1, fl);
		if (libb.age > year)
		{
			fprintf(ft, "%s nazvanie: %d\n", libb.age, libb.nazv);
		}
	}

	fclose(fl);
	fclose(ft);
}