//  SPDX-FileCopyrightText: 2023 Yury Gubich <blue@macaw.me>
//  SPDX-License-Identifier: GPL-3.0-or-later

#pragma once

#include <memory>
#include <optional>
#include <map>

#include <QObject>
#include <QString>
#include <QUrl>
#include <QJSValue>
#include <QNetworkAccessManager>
#include <QNetworkReply>
#include <QTimer>

class Root;
class API : public QObject {
    friend class Root;
    Q_OBJECT
public:
    enum State {
        Offline,
        NoServer,
        NotAuthenticated,
        Authenticating,
        Authenticated
    };
    Q_ENUM(State)

private:
    Q_PROPERTY(QUrl address READ getAddress NOTIFY addressChanged)
    Q_PROPERTY(State state READ getState NOTIFY stateChanged)

public:
    explicit API(const QUrl& path = QString(), QObject* parent = nullptr);

    QUrl getAddress() const;
    State getState() const;
    void setTokens(const QString access, const QString& renew);
    void startPolling();

signals:
    void addressChanged(const QUrl& path);
    void stateChanged(State state);

    void storeTokens(const QString& access, const QString& renew);

public slots:
    void test(const QString& path, const QJSValue& finished = QJSValue());
    void sendRegister(const QString& login, const QString& password, const QJSValue& finished = QJSValue());
    void sendLogin(const QString& login, const QString& password, const QJSValue& finished = QJSValue());

private slots:
    void onTestFinished(QNetworkReply* reply, const QUrl& addr, const QJSValue& finished);
    void onRegisterFinished(QNetworkReply* reply, const QJSValue& finished) const;
    void onLoginFinished(QNetworkReply* reply, const QJSValue& finished);
    void onPollFinished(QNetworkReply* reply);

    void onFirstPollSuccess();

private:
    void callCallback(const QJSValue& callback, const QString& error = QString(), const QJSValueList& arguments = QJSValueList()) const;
    void setAddress(const QUrl& path);
    static std::optional<QVariantMap> readResult(QNetworkReply* reply);
    static bool validateResponse(const std::optional<QVariantMap>& data, const std::map<QString, QMetaType::Type>& structure);
    void setState(State newState);
    QUrl createUrl(const QString& path) const;

private:
    QUrl address;
    QNetworkAccessManager network;
    State state;
    QString accessToken;
    QString renewToken;
    QTimer firstPoll;
};