/*
 * files.cpp
 *
 *  Created on: 10.10.2013
 *      Author: trifon
 */

#include <iostream>
#include <fstream>
#include "student.h"
using namespace std;

void testofiles() {
	ofstream test("test.txt", ios::app);
	test << "Hello, this is a text file!\n";
	test << 1.2 << ' ' << 10 << endl;
	test.close();

	int a[] = { 1, 2, 3, 5, 8, 13 };
	ofstream testbin("test.dat", ios::out | ios::binary);
	testbin.write((const char*)a, 6 * sizeof(int));
	testbin.close();
}

void testifiles() {
	ifstream test("test.txt");
	char line[100];
	test.getline(line, 100);
	cout << "Read line: " << line << endl;
	double d;
	int i;
	test >> d >> i;
	cout << "d = " << d << endl;
	cout << "i = " << i << endl;
	test.close();

	ifstream testbin("test.dat", ios::in | ios::binary);
	int a[6] = {0};
	// !!! testbin.seekg(2);
	testbin.seekg(sizeof(int));
	testbin.read((char*)a, sizeof(int) * 2);
	testbin.seekg(sizeof(int), ios::cur);
	testbin.read((char*)(a+2), sizeof(int) * 2);
	testbin.seekg(sizeof(int) * -2, ios::end);
	testbin.read((char*)a, sizeof(int) * 2);
	for(i = 0; i < 6; i++)
		cout << a[i] << ' ';
	cout << endl;
	testbin.close();

}

void testiofile() {
	fstream f("essay.txt", ios::in | ios::out);
	char line[100];
	//f.getline(line, 100);
	//cout << "Read line: " << line << endl;
	f << "IGNORE THIS TEXT!\n";
	f.close();
}

const char STUDENTS_FILE[] = "students.txt";
const char STUDENTS_DATA[] = "students.dat";

void writeStudents() {
	Student s1("Иван Иванов", 40000, 5.5);
	Student s2("Мария Георгиева", 40001, 6);
	ofstream of(STUDENTS_FILE);
	of << s1 << s2 << Student("Петър Петров", 40002, 4.75);
	of.close();
}

void readStudents() {
	Student s("", 0, 0);
	ifstream fi(STUDENTS_FILE);
	while (fi >> s)
		cout << s;
	fi.close();
}

void writeBinary() {
	Student s("", 0, 0);
	ifstream fit(STUDENTS_FILE);
	ofstream fob(STUDENTS_DATA, ios::out | ios::binary);
	while (fit >> s)
		fob.write((const char*)&s, sizeof(Student));
	fit.close();
	fob.close();
}

void readBinary() {
	Student s("", 0, 0);
	ifstream fib(STUDENTS_DATA, ios::in | ios::binary);
	while (fib.read((char*)&s, sizeof(Student)))
		cout << s;
	fib.close();
}

Student readStudent(int i) {
	ifstream fib(STUDENTS_DATA, ios::in | ios::binary);
	fib.seekg(i * sizeof(Student));
	Student s("", 0, 0);
	fib.read((char*)&s, sizeof(Student));
	if (!fib) {
		cerr << "Няма такъв студент!";
		return s;
	}
	fib.close();
	return s;
}

void writeStudent(Student const& s, int i) {
	fstream fob(STUDENTS_DATA, ios::out | ios::in | ios::binary);
	fob.seekp(i * sizeof(Student));
	fob.write((const char*)&s, sizeof(Student));
	fob.close();
}

int main() {
	//testofiles();
	//testifiles();
	//testiofile();
	// writeStudents();
	// readStudents();
	writeBinary();
	//readBinary();
	// cout << readStudent(4);
	 writeStudent(readStudent(1), 2);
	 writeStudent(readStudent(1), 10);
	 readBinary();
}