Kontrolno2_BP2_zad2

#include <iostream>
#include <string>
#include <conio.h>
#include <fstream>

#if __has_include(<regex>)
    #define has_regex true
    #include <regex>
#endif

using namespace std;

struct Friends {
    string familiq;
    string telefon;
};


auto input_friends(Friends *, size_t) -> void;
auto output_friends(Friends *, size_t) -> void;
auto search_friends(Friends *, size_t ) -> void;
auto change_number(Friends *, size_t) -> void;

int main() {

    size_t choice, count(0);

    Friends *friends = nullptr;

    do {
        system("cls");

        cout << "Menu: \n\n";
        cout << "[1] Input friends\n";
        cout << "[2] Search in file\n";
        cout << "[3] Change telephone number\n";
        cout << "[4] Output information from the file\n\n";
        cout << "[0] Exit\n";

        cout << "Your choice: ";
        cin >> choice;

        switch (choice) {
            case 1:
                system("cls");

                cout << "Enter number of friends: ";
                cin >> count;

                if (!cin || !count)
                    cout << "Error: invalid number of friends";

                friends = new Friends[count];

                input_friends(friends, count);

                cout << "\n\nPress any key to get back to the menu!";
                _getch();

                break;

            case 2:
                system("cls");

                search_friends(friends, count);

                cout << "\n\nPress any key to get back to the menu!";
                _getch();


                break;

            case 3: {
                system("cls");

                change_number(friends, count);

                cout << "\n\nPress any key to get back to the menu!";
                _getch();

                break;
            }
            case 4:
                system("cls");

                output_friends(friends, count);

                cout << "\n\nPress any key to get back to the menu!";
                _getch();

                break;
        }

    } while (choice != 0);

    return 0;
}

auto input_friends(Friends *friends, size_t count) -> void {

    fstream file("friends.dat", ios::binary | ios::out);

    cin.ignore();

    for (size_t i = 0; i < count; i++) {
        bool isCorrect(false);

        cout << "Enter Surname of Friend #" << i << " : ";
        getline(cin, friends[i].familiq);

        do {

            cout << "Enter telephone number: ";
            getline(cin, friends[i].telefon);

            #if has_regex
                if (regex_match(friends[i].telefon, static_cast<regex> ("[0-0]{1}[8-8]{1}[0-9]{8}")))
                    for (size_t j = 0; j < count - 1; j++)
                        if (friends[j].telefon == friends[i].telefon && j != i)
                            cout << "\n\nThe telephone number must be 10 characters and UNIQUE!\n\n";
                        else
                            isCorrect = true;
            #else
                if (friends[i].telefon.length() == 10) {
                    for(size_t j = 0; j < count - 1; j++)
                        if(friends[j].telefon == friends[i].telefon  && j != i)
                            isCorrect = true;
                        else
                            cout << "\n\nThe telephone number must be 10 characters and UNIQUE!\n\n";
                }
            #endif

        } while (!isCorrect);
    }


    file.write(reinterpret_cast<char *> (&friends), count * sizeof(Friends));

    file.close();
}

auto output_friends(Friends *friends, size_t count) -> void {

    fstream file("friends.dat", ios::binary | ios::in);

    file.read(reinterpret_cast<char *> (&friends), count * sizeof(Friends));

    for (size_t i = 0; i < count; i++)
        cout << "Familiq: " + friends[i].familiq + " | Telefon: " + friends[i].telefon << endl;

    file.close();
}

auto search_friends(Friends *friends, size_t count) -> void {

    fstream file("friends.dat", ios::binary | ios::in);

    file.read(reinterpret_cast<char *> (&friends), count * sizeof(Friends));

    size_t counter(0);

    for (size_t i = 0; i < count; i++) {
        if (strstr(friends[i].telefon.c_str(), "0876")) {
            cout << "Familiq: " + friends[i].familiq + " | Telefon: " + friends[i].telefon << endl;
        }
        else
            counter++;
    }

    if (counter == 0)
        cout << "There are no friends with number that starts with \"0876\"";

    file.close();
}

auto change_number(Friends *friends, size_t count) -> void {

    fstream file("friends.dat", ios::binary | ios::in);

    file.read(reinterpret_cast<char *> (&friends), count * sizeof(Friends));
    file.close();

    file.open("friends.dat", ios::binary | ios::out);

    cin.ignore();

    size_t counter(0);
    string telephone_number;
    bool isCorrect(false);

    cout << "Enter telephone number to change: ";
    getline(cin, telephone_number);

    for (size_t i = 0; i < count; i++) {
        if (telephone_number == friends[i].telefon) {
            counter++;

            cout << "Current telephone number: " << friends[i].telefon << " | Friend Surname: " << friends[i].familiq << "\n\n";

            do {

                cout << "Enter the new telephone number: ";
                getline(cin, friends[i].telefon);

                #if has_regex
                    if (regex_match(friends[i].telefon, static_cast<regex> ("[0-0]{1}[8-8]{1}[0-9]{8}")))
                        for (size_t j = 0; j < count - 1; j++)
                            if (friends[j].telefon == friends[i].telefon && j != i)
                                cout << "\n\nThe telephone number must be 10 characters and UNIQUE!\n\n";
                            else
                                isCorrect = true;
                #else
                    if (friends[i].telefon.length() == 10) {
                        for (size_t j = 0; j < count; j++)
                            if (friends[j].telefon == friends[i].telefon && j != i)
                                isCorrect = true;
                            else
                                cout << "\n\nThe telephone number must be 10 characters and UNIQUE!\n\n";
                    }
                #endif

            } while (!isCorrect);
        }
    }

    if (counter == 0)
        cout << "There is no friend with that telephone number!";

    file.write(reinterpret_cast<char *> (&friends), count * sizeof(Friends));

    file.close();
}