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/* Copyright 2013-2018 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 <QList>
#include <QString>
#include <QDir>
#include <QAbstractListModel>

#include "minecraft/Mod.h"

#include "multimc_logic_export.h"

class LegacyInstance;
class BaseInstance;
class QFileSystemWatcher;

/**
 * A legacy mod list.
 * Backed by a folder.
 */
class MULTIMC_LOGIC_EXPORT ModList : public QAbstractListModel
{
	Q_OBJECT
public:
	enum Columns
	{
		ActiveColumn = 0,
		NameColumn,
		DateColumn,
		VersionColumn,
		NUM_COLUMNS
	};
	ModList(const QString &dir);

	virtual QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
	virtual bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
	Qt::DropActions supportedDropActions() const override;

	/// flags, mostly to support drag&drop
	virtual Qt::ItemFlags flags(const QModelIndex &index) const override;
	QStringList mimeTypes() const override;
	bool dropMimeData(const QMimeData * data, Qt::DropAction action, int row, int column, const QModelIndex & parent) override;

	virtual int rowCount(const QModelIndex &) const override
	{
		return size();
	}
	;
	virtual QVariant headerData(int section, Qt::Orientation orientation, int role = Qt::DisplayRole) const override;
	virtual int columnCount(const QModelIndex &parent) const override;

	size_t size() const
	{
		return mods.size();
	}
	;
	bool empty() const
	{
		return size() == 0;
	}
	Mod &operator[](size_t index)
	{
		return mods[index];
	}

	/// Reloads the mod list and returns true if the list changed.
	virtual bool update();

	/**
	 * Adds the given mod to the list at the given index - if the list supports custom ordering
	 */
	bool installMod(const QString& filename);

	/// Deletes all the selected mods
	virtual bool deleteMods(const QModelIndexList &indexes);

	/// Enable or disable listed mods
	virtual bool enableMods(const QModelIndexList &indexes, bool enable = true);

	void startWatching();
	void stopWatching();

	virtual bool isValid();

	QDir dir()
	{
		return m_dir;
	}

	const QList<Mod> & allMods()
	{
		return mods;
	}

private
slots:
	void directoryChanged(QString path);

signals:
	void changed();

protected:
	QFileSystemWatcher *m_watcher;
	bool is_watching = false;
	QDir m_dir;
	QList<Mod> mods;
};