domjudgeapimanager.h

#ifndef DOMJUDGEAPIMANAGER_H
#define DOMJUDGEAPIMANAGER_H

#include <QObject>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QNetworkAccessManager>
#include <QJsonDocument>

#include <QDebug>

namespace DJ
{
namespace Shared
{

class DomjudgeApiManager : public QObject
{
    Q_OBJECT
public:
    static DomjudgeApiManager *sharedApiManager() {
        static DomjudgeApiManager *_instance = nullptr;

        if (!_instance) {
            _instance = new DomjudgeApiManager();
        }

        return _instance;
    }

    void setConnectionInfo(QString protocol, QString url, QString username, QString password);
    void loadUserData();
    void loadContestsData();
    void loadTeamData(QString cid);
    void loadGroupsData(QString cid);
    void loadProblemData(QString cid);
    void loadSubmissions(QString cid);
    void loadJudgings(QString cid);

protected:
    class DomjudgeApiRequest : public QNetworkRequest {
        friend class DomjudgeApiManager;
        explicit DomjudgeApiRequest(QString method, QList<QPair<QString, QString>> arguments = QList<QPair<QString, QString> >());
    };

private:
    explicit DomjudgeApiManager();
    QString protocol, url, username, password;
    QNetworkAccessManager *accessManager;

    QList<QNetworkRequest> userRequests;
    QList<QNetworkRequest> contestsRequests;
    QList<QNetworkRequest> teamsRequests;
    QList<QNetworkRequest> groupsRequests;
    QList<QNetworkRequest> problemRequests;
    QList<QNetworkRequest> submissionRequests;
    QList<QNetworkRequest> judgingRequests;

    template<typename... ArgsError, typename... ArgsSuccess>
    bool processReply(QNetworkReply *reply,
                      QList<QNetworkRequest> *requests,
                      void(DomjudgeApiManager::*errorFunc)(ArgsError...args),
                      void(DomjudgeApiManager::*successFunc)(ArgsSuccess...args));

signals:
    void userLoaded(QJsonDocument user);
    void userDataFailedLoading(QString error);

    void contestsDataLoaded(QJsonDocument contestsData);
    void contestsDataFailedLoading(QString error);

    void groupsDataLoaded(QJsonDocument data);
    void groupsDataFailedLoading(QString error);

    void teamsDataLoaded(QJsonDocument data);
    void teamsDataFailedLoading(QString error);

    void problemsDataLoaded(QJsonDocument data);
    void problemsDataFailedLoading(QString error);

    void submissionsDataLoaded(QJsonDocument data);
    void submissionsDataFailedLoading(QString error);

    void judgingsDataLoaded(QJsonDocument data);
    void judgingsDataFailedLoading(QString error);

private slots:
    void replyFinished(QNetworkReply *reply);

};

}
}

#endif // DOMJUDGEAPIMANAGER_H