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// SPDX-License-Identifier: GPL-3.0-only
// SPDX-FileCopyrightText: 2026 Project Tick
// SPDX-FileContributor: Project Tick Team
/*
* ProjT Launcher - Minecraft Launcher
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 3.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#pragma once
#include <QJsonObject>
#include <QObject>
#include <QUrl>
#include <memory>
#include "net/Mode.h"
#include "net/NetJob.h"
#include "tasks/Task.h"
namespace projt::meta
{
class EntityLoader;
/**
* @brief Cacheable metadata entity loaded from local cache or remote.
*/
class MetaEntity
{
friend class EntityLoader;
public:
using Ptr = std::shared_ptr<MetaEntity>;
enum class State
{
Pending,
Cached,
Synchronized
};
virtual ~MetaEntity() = default;
virtual QString cacheFilePath() const = 0;
virtual QUrl remoteUrl() const;
State state() const
{
return m_state;
}
bool isReady() const
{
return m_state != State::Pending;
}
void setExpectedChecksum(const QString& sha256)
{
m_expectedSha256 = sha256;
}
QString expectedChecksum() const
{
return m_expectedSha256;
}
virtual void loadFromJson(const QJsonObject& json) = 0;
[[nodiscard]] Task::Ptr createLoadTask(Net::Mode mode = Net::Mode::Online);
protected:
State m_state = State::Pending;
QString m_expectedSha256;
QString m_actualSha256;
Task::Ptr m_activeTask;
};
/**
* @brief Task for loading a MetaEntity.
*/
class EntityLoader : public Task
{
Q_OBJECT
public:
explicit EntityLoader(MetaEntity* target, Net::Mode mode);
~EntityLoader() override = default;
protected:
void executeTask() override;
bool canAbort() const override;
bool abort() override;
private:
void attemptLocalLoad();
void initiateRemoteFetch();
bool loadCachedMetadata(const QString& cachePath, QString* errorOut = nullptr);
void handleRemoteFailure(const QString& reason);
void finalizeLoad(MetaEntity::State newState);
MetaEntity* m_target;
Net::Mode m_mode;
NetJob::Ptr m_netTask;
bool m_canUseLocalFallback = false;
};
} // namespace projt::meta
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