#include <iostream>
#include <string>
#include <vector>
#include <fstream>

#include <cstdlib>
#include <ctime>

using namespace std;

/* ------- header part ------- */

class Osoba // nazwa wymuszona przez zadanie, alternatywna wersja: Person
{
public:
    Osoba();

    void EnterData();

    unsigned int ObliczWiek() const; // nazwa wymuszona przez zadania, alternatywna wersja: GetAge()

    string StringizeBirthdate() const;
    string StringizeGender() const;

public: // getters
    inline const string &Name() const { return m_name; }
    inline const string &Surname() const { return m_surname; }
    inline const string &EyeColor() const { return m_eyeColor; }
    inline const unsigned int &Height() const { return m_height; }

private:
    string m_name;
    string m_surname;
    struct
    {
        unsigned long m_day;    // 1 ...31
        unsigned long m_month;  // 1 ...12
        unsigned long m_year;   // 1900 ...GetCurrentYear()
    } m_birthdate;
    string m_eyeColor;
    bool m_male;                // gender: true = male, false = female
    unsigned int m_height;      // unit: cm
};

class Application
{
public:
    Application() : m_running(false) {}

    int Run(const int argc, char *const argv[]);

    static void ClearConsole();
    static unsigned int GetCurrentYear();

private:
    void ShowHeader();
    void Welcome();
    void Menu();

    void AddPerson();
    void RemovePerson();
    void FindPerson();
    void DumpData();
    void Quit();

private:
    bool m_running;
    vector<Osoba> m_data;
};

/* ------- source part ------- */

/* ------- Osoba ------- */

Osoba::Osoba()
    : m_birthdate{ 0 }
    , m_male(false)
    , m_height(0)
{
}

void Osoba::EnterData()
{
    cout << "Imie > ";
    cin >> m_name;

    cout << "Nazwisko > ";
    cin >> m_surname;

    string birthdate;
    cout << "Data urodzenia (format: DD.MM.YYYY) > ";
    cin >> birthdate;
    // TODO Check user input
    m_birthdate.m_day = stoul(birthdate.substr(0, 2));
    m_birthdate.m_month = stoul(birthdate.substr(3, 2));
    m_birthdate.m_year = stoul(birthdate.substr(6, 4));

    cout << "Kolor oczu > ";
    cin >> m_eyeColor;

    for (;;)
    {
        char gender = '\0';
        cout << "Plec (m/k) > ";
        cin >> gender;
        if (gender == 'm' || gender == 'k')
        {
            m_male = (gender == 'm');
            break;
        } else cout << "Niepoprawna plec, wprowadz m(ezczyzna) lub k(obieta)" << endl;
    }

    cout << "Wzrost > ";
    cin >> m_height;
}

unsigned int Osoba::ObliczWiek() const
{
    return Application::GetCurrentYear() - m_birthdate.m_year;
}

string Osoba::StringizeBirthdate() const
{
    char result[256];
    sprintf(result, "%02d.%02d.%04d", m_birthdate.m_day, m_birthdate.m_month, m_birthdate.m_year);
    return string(result);
}

string Osoba::StringizeGender() const
{
    return m_male ? "M" : "K";
}

/* ------- Application ------- */

int Application::Run(const int argc, char *const argv[])
{
    Welcome();
    for (m_running = true; m_running; Menu());
    return 0;
}

void Application::ShowHeader()
{
    cout << "***************************" << endl;
    cout << "*** Program ewidencyjny ***" << endl;
    cout << "***************************" << endl;
    cout << " Liczba zaewidencjonowanych osob: " << m_data.size() << endl;


}

void Application::Welcome()
{
    ShowHeader();

    char choice = 'n';
    cout << endl << "Czy chcesz dodac informacje o nowej osobie? [y/n] > ";
    cin >> choice;

    if(choice == 'y')
    {
        AddPerson();
    }
}

void Application::Menu()
{
    ShowHeader();

    struct Option { void(Application::*callback)(); string name; }
    static const options[] = {
        { nullptr,                      "" },
        { &Application::AddPerson,      "Dodaj osobe" },
        { &Application::RemovePerson,   "Usun osobe" },
        { &Application::FindPerson,     "Wyszukaj osobe" },
        { &Application::DumpData,       "Archiwizacja danych do pliku tekstowego" },
        { &Application::Quit,           "Wyjscie" }
    };
    static const size_t optionsCount = sizeof(options) / sizeof(options[0]);

    cout << endl << " Menu:" << endl;
    for (size_t i = 0; i < optionsCount; ++i)
    {
        if(!options[i].callback) continue;
        cout << " [" << i << "] " << options[i].name << endl;
    }

    for (;;)
    {
        cout << endl << "Wybor > ";

        unsigned int choice = 0;
        cin >> choice;

        if(choice >= optionsCount || !options[choice].callback)
        {
            cout << "Nie ma takiej opcji do wyboru!" << endl;
            continue;
        }

        (this->*(options[choice].callback))();
        break;
    }
}

void Application::AddPerson()
{
    cout << " < Dodawanie osoby >" << endl << endl;
    Osoba person;
    person.EnterData();
    m_data.push_back(person);
    cout << " Osoba zostala dodana" << endl;
}

void Application::RemovePerson()
{
    if(m_data.empty())
    {
        cout << "Zadna osoba nie jest zaewidencjonowana!" << endl;
        return;
    }

    cout << " < Usuwanie osoby >" << endl << endl;

    cout << "Zaewidencjonowane osoby:" << endl;
    for (size_t i = 0; i < m_data.size(); ++i)
    {
        const Osoba &person = m_data[i];
        cout << " [" << i << "] " << person.Name() << " " << person.Surname() << endl;
    }
    cout << endl;

    for (;;)
    {
        size_t personToRemove = 0;
        cout << "Wprowadz index ktory chcesz usunac [ 0, ..." << m_data.size() - 1 << " ] > ";
        cin >> personToRemove;

        if(personToRemove >= m_data.size())
        {
            cout << "Niepoprawna wartosc!" << endl;
            continue;
        }

        m_data.erase(m_data.begin() + personToRemove);
        cout << "Index zostal usuniety" << endl;
        break;
    }
}

void Application::FindPerson()
{
    // TODO Implementacja tej metody
}

void Application::DumpData()
{
    ofstream file("data.txt", ios::binary);
    if(!file)
    {
        cout << "Nie mozna otworzyc pliku do zapisu!" << endl;
        return;
    }

    for(size_t i = 0; i < m_data.size(); ++i)
    {
        const Osoba &person = m_data[i];
        file << "[" << i << "] " << person.Name() << " " << person.Surname()
             << " " << person.StringizeBirthdate() << " " << person.StringizeGender()
             << " " << person.Height() << "\r\n" /* windows-like new line */;
    }
}

void Application::Quit()
{
    m_running = false;
}

void Application::ClearConsole()
{
#ifdef _WIN32
    system("cls");
#else
    // TODO Write linux/osx implementation of clear console function
#endif
}

unsigned int Application::GetCurrentYear()
{
    const time_t t = time(nullptr);
    const struct tm *const info = localtime(&t);
    return info->tm_year + 1900;
}

/* ------- entry point ------- */

int main(int argc, char *argv[])
{
    Application app;
    return app.Run(argc, argv);
}

/* eof */