#include "Assignment.h"
#include "Error.h"
#include "Manager.h"

using err::Error;
using util::Manager;
namespace models {
    Assignment::Assignment(const int& user_id, const int& task_id) : user_id(user_id), task_id(task_id) {
        //validate user exist
        Manager* mgr = Manager::get_instance();
        if (mgr->get_user(user_id) == nullptr) {
            throw Error(401, "Eine solche BenutzerIn existiert nicht.");
        }
        if (mgr->get_task(task_id) == nullptr) {
            throw Error(402, "Eine solche Aufgabe existiert nicht.");
        }


    }
    Assignment::Assignment(): user_id(0), task_id(0) {}

    ostream& Assignment::write(ostream& stream) const
    {
        stream << *this;
        return stream;
    }

    int Assignment::get_task_id() const {
        return this->task_id;
    }

    int Assignment::get_user_id() const {
        return this->user_id;
    }

    ostream& operator<<(ostream& os, const Assignment& t) {
        os << t.get_user_id() << " " << t.get_task_id() << "\n";
        return os;
    }

    istream& operator>>(istream& is, Assignment& t) {
        int user_id;
        is >> user_id;
        if (!is)
            throw Error(602, "Datei hat ein unbekanntes Format.");
        int task_id;
        is >> task_id;
        if (!is)
            throw Error(602, "Datei hat ein unbekanntes Format.");
        t = {user_id, task_id};
        return is;
    }
} // models