/* 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 2015-2021 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.
 */

#include "Index.h"

#include "VersionList.h"
#include "JsonFormat.h"

namespace Meta
{
	Index::Index(QObject* parent) : QAbstractListModel(parent) {}
	Index::Index(const QVector<VersionListPtr>& lists, QObject* parent)
		: QAbstractListModel(parent), m_lists(lists)
	{
		for (int i = 0; i < m_lists.size(); ++i) {
			m_uids.insert(m_lists.at(i)->uid(), m_lists.at(i));
			connectVersionList(i, m_lists.at(i));
		}
	}

	QVariant Index::data(const QModelIndex& index, int role) const
	{
		if (index.parent().isValid() || index.row() < 0 ||
			index.row() >= m_lists.size()) {
			return QVariant();
		}

		VersionListPtr list = m_lists.at(index.row());
		switch (role) {
			case Qt::DisplayRole:
				switch (index.column()) {
					case 0:
						return list->humanReadable();
					default:
						break;
				}
			case UidRole:
				return list->uid();
			case NameRole:
				return list->name();
			case ListPtrRole:
				return QVariant::fromValue(list);
		}
		return QVariant();
	}
	int Index::rowCount(const QModelIndex& parent) const
	{
		return m_lists.size();
	}
	int Index::columnCount(const QModelIndex& parent) const
	{
		return 1;
	}
	QVariant Index::headerData(int section, Qt::Orientation orientation,
							   int role) const
	{
		if (orientation == Qt::Horizontal && role == Qt::DisplayRole &&
			section == 0) {
			return tr("Name");
		} else {
			return QVariant();
		}
	}

	bool Index::hasUid(const QString& uid) const
	{
		return m_uids.contains(uid);
	}

	VersionListPtr Index::get(const QString& uid)
	{
		VersionListPtr out = m_uids.value(uid, nullptr);
		if (!out) {
			out = std::make_shared<VersionList>(uid);
			m_uids[uid] = out;
		}
		return out;
	}

	VersionPtr Index::get(const QString& uid, const QString& version)
	{
		auto list = get(uid);
		return list->getVersion(version);
	}

	void Index::parse(const QJsonObject& obj)
	{
		parseIndex(obj, this);
	}

	void Index::merge(const std::shared_ptr<Index>& other)
	{
		const QVector<VersionListPtr> lists =
			std::dynamic_pointer_cast<Index>(other)->m_lists;
		// initial load, no need to merge
		if (m_lists.isEmpty()) {
			beginResetModel();
			m_lists = lists;
			for (int i = 0; i < lists.size(); ++i) {
				m_uids.insert(lists.at(i)->uid(), lists.at(i));
				connectVersionList(i, lists.at(i));
			}
			endResetModel();
		} else {
			for (const VersionListPtr& list : lists) {
				if (m_uids.contains(list->uid())) {
					m_uids[list->uid()]->mergeFromIndex(list);
				} else {
					beginInsertRows(QModelIndex(), m_lists.size(),
									m_lists.size());
					connectVersionList(m_lists.size(), list);
					m_lists.append(list);
					m_uids.insert(list->uid(), list);
					endInsertRows();
				}
			}
		}
	}

	void Index::connectVersionList(const int row, const VersionListPtr& list)
	{
		connect(list.get(), &VersionList::nameChanged, this, [this, row]() {
			emit dataChanged(index(row), index(row),
							 QVector<int>() << Qt::DisplayRole);
		});
	}
} // namespace Meta