#include <iostream>
#include <thread>
using namespace std;

 mutex m;

class parking{

    bool zauzet;
    condition_variable ulazi[2];
    int na_redu;


    public:
        parking():zauzet(false),na_redu(0){}
        void udji(int ulaz);
        void izadji();

};

void  parking::udji(int ulaz){
    unique_lock<mutex> lock(m);
    while (zauzet){
            if(ulaz==0)
                ulazi[0].wait(lock);
            else
                ulazi[1].wait(lock);

        }
    zauzet=true;
    na_redu=(na_redu+1)%2;


    cout<<"Automobil sa registracijom "<<this_thread::get_id()<<" sa ulaza"<<ulaz<<" usao je na parking"<<endl;

}

void parking::izadji(){

    zauzet=false;
    ulazi[na_redu].notify_one();
}


void automobil (parking &p,int ulaz,int ostajem_na_parkingu){

   // {
   // lock_guard<mutex> lock(m);
   // cout<<"Automobil sa registracijom "<<this_thread::get_id()<<" sa ulaza"<<ulaz<<" zeli da udje na parking"<<endl;
    //}

    p.udji(ulaz);

    this_thread::sleep_for(chrono::seconds(ostajem_na_parkingu));

    p.izadji();

    lock_guard<mutex> lock(m);
    cout<<"Automobil sa registracijom "<<this_thread::get_id()<<" sa ulaza"<<ulaz<<" je izasao sa parkinga"<<endl;
}

int main()
{
    thread t[10];
    parking p;

    for (int i=0;i<5;i++)
        t[i]=thread(automobil,ref(p),0,1);
    for (int i=5;i<10;i++)
        t[i]=thread(automobil,ref(p),1,3);
    for (int i=0;i<10;i++)
        t[i].join();

    return 0;
}