/* SPDX-FileCopyrightText: 2026 Project Tick
 * SPDX-FileContributor: Project Tick
 * SPDX-License-Identifier: GPL-3.0-or-later
 *
 *   MeshMC - A Custom Launcher for Minecraft
 *   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, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   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, see <https://www.gnu.org/licenses/>.
 *
 *  This file incorporates work covered by the following copyright and
 *  permission notice:
 *
 * Copyright 2013-2021 MultiMC Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#pragma once

#include <QObject>
#include <QMap>
#include <QStringList>
#include <QVariant>
#include <memory>

class Setting;
class SettingsObject;

typedef std::shared_ptr<SettingsObject> SettingsObjectPtr;

/*!
 * \brief The SettingsObject handles communicating settings between the
 * application and a settings file. The class keeps a list of Setting objects.
 * Each Setting object represents one of the application's settings. These
 * Setting objects are registered with a SettingsObject and can be managed
 * similarly to the way a list works.
 *
 * \author Andrew Okin
 * \date 2/22/2013
 *
 * \sa Setting
 */
class SettingsObject : public QObject
{
	Q_OBJECT
  public:
	class Lock
	{
	  public:
		Lock(SettingsObjectPtr locked) : m_locked(locked)
		{
			m_locked->suspendSave();
		}
		~Lock()
		{
			m_locked->resumeSave();
		}

	  private:
		SettingsObjectPtr m_locked;
	};

  public:
	explicit SettingsObject(QObject* parent = 0);
	virtual ~SettingsObject();
	/*!
	 * Registers an override setting for the given original setting in this
	 * settings object gate decides if the passthrough (true) or the original
	 * (false) is used for value
	 *
	 * This will fail if there is already a setting with the same ID as
	 * the one that is being registered.
	 * \return A valid Setting shared pointer if successful.
	 */
	std::shared_ptr<Setting> registerOverride(std::shared_ptr<Setting> original,
											  std::shared_ptr<Setting> gate);

	/*!
	 * Registers a passthorugh setting for the given original setting in this
	 * settings object gate decides if the passthrough (true) or the original
	 * (false) is used for value
	 *
	 * This will fail if there is already a setting with the same ID as
	 * the one that is being registered.
	 * \return A valid Setting shared pointer if successful.
	 */
	std::shared_ptr<Setting>
	registerPassthrough(std::shared_ptr<Setting> original,
						std::shared_ptr<Setting> gate);

	/*!
	 * Registers the given setting with this SettingsObject and connects the
	 * necessary  signals.
	 *
	 * This will fail if there is already a setting with the same ID as
	 * the one that is being registered.
	 * \return A valid Setting shared pointer if successful.
	 */
	std::shared_ptr<Setting> registerSetting(QStringList synonyms,
											 QVariant defVal = QVariant());

	/*!
	 * Registers the given setting with this SettingsObject and connects the
	 * necessary signals.
	 *
	 * This will fail if there is already a setting with the same ID as
	 * the one that is being registered.
	 * \return A valid Setting shared pointer if successful.
	 */
	std::shared_ptr<Setting> registerSetting(QString id,
											 QVariant defVal = QVariant())
	{
		return registerSetting(QStringList(id), defVal);
	}

	/*!
	 * \brief Gets the setting with the given ID.
	 * \param id The ID of the setting to get.
	 * \return A pointer to the setting with the given ID.
	 * Returns null if there is no setting with the given ID.
	 * \sa operator []()
	 */
	std::shared_ptr<Setting> getSetting(const QString& id) const;

	/*!
	 * \brief Gets the value of the setting with the given ID.
	 * \param id The ID of the setting to get.
	 * \return The setting's value as a QVariant.
	 * If no setting with the given ID exists, returns an invalid QVariant.
	 */
	QVariant get(const QString& id) const;

	/*!
	 * \brief Sets the value of the setting with the given ID.
	 * If no setting with the given ID exists, returns false
	 * \param id The ID of the setting to change.
	 * \param value The new value of the setting.
	 * \return True if successful, false if it failed.
	 */
	bool set(const QString& id, QVariant value);

	/*!
	 * \brief Reverts the setting with the given ID to default.
	 * \param id The ID of the setting to reset.
	 */
	void reset(const QString& id) const;

	/*!
	 * \brief Checks if this SettingsObject contains a setting with the given
	 * ID.
	 * \param id The ID to check for.
	 * \return True if the SettingsObject has a setting with the given ID.
	 */
	bool contains(const QString& id);

	/*!
	 * \brief Reloads the settings and emit signals for changed settings
	 * \return True if reloading was successful
	 */
	virtual bool reload();

	virtual void suspendSave() = 0;
	virtual void resumeSave() = 0;
  signals:
	/*!
	 * \brief Signal emitted when one of this SettingsObject object's settings
	 * changes. This is usually just connected directly to each Setting object's
	 * SettingChanged() signals.
	 * \param setting A reference to the Setting object that changed.
	 * \param value The Setting object's new value.
	 */
	void SettingChanged(const Setting& setting, QVariant value);

	/*!
	 * \brief Signal emitted when one of this SettingsObject object's settings
	 * resets. This is usually just connected directly to each Setting object's
	 * settingReset() signals.
	 * \param setting A reference to the Setting object that changed.
	 */
	void settingReset(const Setting& setting);

  protected slots:
	/*!
	 * \brief Changes a setting.
	 * This slot is usually connected to each Setting object's
	 * SettingChanged() signal. The signal is emitted, causing this slot
	 * to update the setting's value in the config file.
	 * \param setting A reference to the Setting object that changed.
	 * \param value The setting's new value.
	 */
	virtual void changeSetting(const Setting& setting, QVariant value) = 0;

	/*!
	 * \brief Resets a setting.
	 * This slot is usually connected to each Setting object's
	 * settingReset() signal. The signal is emitted, causing this slot
	 * to update the setting's value in the config file.
	 * \param setting A reference to the Setting object that changed.
	 */
	virtual void resetSetting(const Setting& setting) = 0;

  protected:
	/*!
	 * \brief Connects the necessary signals to the given Setting.
	 * \param setting The setting to connect.
	 */
	void connectSignals(const Setting& setting);

	/*!
	 * \brief Function used by Setting objects to get their values from the
	 * SettingsObject.
	 * \param setting The
	 * \return
	 */
	virtual QVariant retrieveValue(const Setting& setting) = 0;

	friend class Setting;

  private:
	QMap<QString, std::shared_ptr<Setting>> m_settings;

  protected:
	bool m_suspendSave = false;
	bool m_doSave = false;
};