#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<string>
#include<fstream>
#include<ctype.h>
using std::ofstream;
using std::ifstream;
using std::string;
using std::cout;
using std::cin;
using std::endl;

/*Структура студента*/
struct Student
{
    char second_name[24];
    int group_num = 0;
    int marks[3] = { 0,0,0 };
    double average_mark = 0;

    /*Вывод данных, 2 опция*/
    void show(ifstream& fin)
    {
        Student student;
        if (fin.is_open()) { //Проверка на то, открыт ли файл
            while (fin.read((char*)&student, sizeof(Student))){ //Вывод данных о студенте
                cout << "Second name: " << student.second_name;
                cout << "Group number: " << student.group_num;
                cout << "Marks (physics, math, informatics) ";
                for (int i = 0; i < 3; i++)
                {
                    cout << student.marks[i] << ' ';
                }
                cout << endl;
                cout << "Average mark: " << student.average_mark;
                cout << "====================================================================" << endl;
            }
        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }

    /*Добавление данных, 3 опция*/
    void add(ofstream& fout)
    {
        Student student;
        if (fout.is_open()) { //Проверка на то, открыт ли файл

            /*Запись фамилии*/
            cout << "Enter a second name" << endl;
            cin >> student.second_name;

            /*Запись номера группы*/
            cout << "Enter a group number" << endl;
            cin >> student.group_num;

            /*Запись оценок*/
            cout << "Enter a marks (physics, math, informatics)" << endl;
            for (int i = 0; i < 3; i++)
            {
                cin >> student.marks[i];
            }

            /*Вычисление среднего балла*/
            for (int i = 0; i < 3; i++)
            {
                student.average_mark += marks[i];
            }
            average_mark = average_mark / 3;

            fout.write((char*)&student, sizeof(Student)); //Непосредственно запись
        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }

    /*Решение инд. задания, 4 опция*/
    void individual(ofstream& fout, ifstream& fin)
    {
        if (fout.is_open() && fin.is_open()) { //Проверка на то, открыт ли файл

        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }

    /*Редактирование данных, 5 опция*/
    void edit(ofstream& fout, ifstream& fin)
    {
        if (fout.is_open() && fin.is_open()) { //Проверка на то, открыт ли файл

        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }

    /*Удаление данных, 6 опция*/
    void delete_student(ofstream& fout, ifstream& fin)
    {
        if (fout.is_open() && fin.is_open()) { //Проверка на то, открыт ли файл

        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }

    /*Сортировка данных, 7 опция*/
    void sort(ofstream& fout, ifstream& fin)
    {
        if (fout.is_open() && fin.is_open()) { //Проверка на то, открыт ли файл

        }
        else {
            cout << "The file wasn't created or opened" << endl;
        }
    }
};

int main() {
    ofstream fout;
    ifstream fin;
    Student student;
    bool cont = true;
    int answer;
    while (cont) {
        cout << "What you want to do?\n1.Create or open file\n2.Show all data\n3.Add a new student" << endl;
        cout<<"4.Solve an individual problem\n5.Edit a data about on of students\n6.Delete one of students\7.Sort our students\nTip:If you don't choose any, the programm will stop" << endl;
        cin >> answer;
        cout << endl;
        switch (answer) {
        case 1:
            fout.open("dataBase.txt");
            fin.open("dataBase.txt");
            break;
        case 2:
            student.show(fin);
            break;
        case 3:
                student.add(fout);
            break;
        case 4:
                student.individual(fout, fin);
            break;
        case 5:
                student.edit(fout, fin);
            break;
        case 6:
                student.delete_student(fout, fin);
            break;
        case 7:
                student.sort(fout, fin);
            break;
        default:
            cont = false;
            break;
        }
        fout.close();
        fin.close();
    }
}