#include <iostream>
#include <iomanip>
#include <vector>
#include <algorithm>
#include <random>
#include <sstream>
#include <random>
#include <string>
#include <fstream>
#include <cmath>

using namespace std;


struct studentas {
    string firstName;
    string secondName;

    vector<double> nd;

    double visiNd = 0;
    double egz = 0;


void readFile (int &index, vector<studentas> &s);

//Storing information

    void data() {
        cout << "Studento vardas: ";
        cin >> firstName;
        cout << "\n";
        cout << "Studento pavarde: ";
        cin >> secondName;
        cout << "\n";

        cout << "Ar noresite sugeneruoti random pazymius ir egzamino balus? Random - spauskite 1. Ivesties budu - spauskite 0: \n";
        int ivestiesRadom;
        cin >> ivestiesRadom;

        while (cin.fail()) {
            cout << "Blogas irasymas, bandykite dar karta: \n";
            cin.clear();
            cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
            cin >> ivestiesRadom;
        }

        if (b == 1) {
            randomNumbers();
        }

        else {
            numberInput();
            cout << "Iveskite studento egzamino rezultata: \n";
            cin >> egz;
        }
    }

//Generuoja random skaicius

    void randomNumbers() {
        cout << "Iveskite kiek norite sugeneruoti skaiciu!: \n";
        cin >> visiNd;

        while (cin.fail()){
            cout << "Blogas irasymas, bandykite dar karta: \n";
            cin.clear();
            cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
            cin >> visiNd;

        }

        nd.reserve(visiNd);

        const unsigned int seed = time(0);
        mt19937_64 rng(seed);
        uniform_real_distribution<double> random(1, 10);

        for (int i = 0; i<visiNd; i++) {
            nd.push_back(static_cast<int>(random(rng)));

        }

        egz = static_cast<int>(random(rng));
    }

//Rankiniu budu turi suvest nd ir egz

    void numberInput() {
        cout << "Iveskit namu darbu pazymius, norint pabaigti, iveskite ne skaiciu! \n";

        int skc;

        while (cin >> skc) {
            if (!(skc >= 1 && skc <= 10)){
            cout << "Pazymys turi buti tarp 1 ir 10! \n";
            continue;
            }
            nd.push_back(skc);
        }

        visiNd  = nd.size();

        cin.clear();
        cin.ignore(numeric_limits<std::streamsize>::max(), '\n');
    }

//Vidutinio skaiciavimas

    double vid () {
        double vidutinis = 0;

        for (auto &viens : nd) {
            vidutinis += viens;
        }

        vidutinis /= nd.size();

        return vidutinis;
}

//Medianos skaiciavimas

    double median (vector<double>set) {
        sort(set.begin(), set.end());
        return (set.size()% 2 == 0 ? (set[set.size()/2] + set[(set.size() / 2 ) - 1]) / 2 : set[set.size() / 2]);
    }

    double galutinioM() {
        return 0.4 * median(nd) + 0.6 * egz;
    }

    double galutinioV() {
        return 0.4 * vid() + 0.6 * egz;
    }
};

void display(vector<studentas> s, int index);

void readFile (int &index, vector<studentas> &s);

int main()
{
    vector<studentas> s;
    cout << "Ar norite nuskaityti studentus is failo, ar ivesti pats? 1 - jei pats, 0 - jei is failo\n";

    int pasirinkimas;
    cin >> pasirinkimas;

    int index = 0;

    if (pasirinkimas == 0) {
        readFile(index, s);
    } else if (pasirinkimas == 1) {
        cout << "Kiek noresite ivesti studentu ?" << endl;
        int stud;
        cin >> stud;
        s.resize(stud);
        while(cin.fail()) {
            cin.clear();
            cin.ignore(numeric_limits<std::streamsize>::max(), '\n');
            cout << "Neteisingai ivedete, veskite dar karta! ";
            cin >> stud;
        }

        index = stud;

        cout << "\n";

        for (int i = 0; i < stud; i++) {

            s[i].data();
        }
    }

    display(s, index);

    return 0;
}

//skaito is failo

void readFile (int &index, vector<studentas> &s) {

    string line;

    int ndVisu;

    ifstream file_("studentai.txt");

    getline(file_, line); //pirmas

    while (getline(file_, line)) {
        istringstream pirmi(line);
        s.push_back(studentas());
        pirmi >> s[index].firstName;
        pirmi >> s[index].secondName;

        while (pirmi) {
            pirmi >> ndVisu;
            s[index].nd.push_back(ndVisu);
        }

        s[index].egz = s[index].nd.back();
        s[index].nd.pop_back();
        index++;
    }

}

//Sortina studentus

/*void srt(int index)
{
    studentas s[60];


sort(s, s + index);
 [](studentas a, studentas b)-> bool{return (a.firstName<b.firstName);}
 }
 */

void display(vector<studentas> s, int index)
{
 //Displaying information

        cout << "Jusu pateikta informacija: \n";

        cout << "Pavarde            Vardas          Galutinis(Vid.)         Galutinis(Med.) \n";

        cout <<"-------------------------------------------------------------------------------------";


    for (int i = 0; i < index; ++i) {
        cout << s[i].firstName << "             " << s[i].secondName << fixed<< setprecision(2) <<"             " << s[i].galutinioV() <<"                   "<<s[i].galutinioM()<<"\n";
    }
}