/* 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 "VersionList.h"

#include <QDateTime>

#include "Version.h"
#include "JsonFormat.h"
#include "Version.h"

namespace Meta
{
	VersionList::VersionList(const QString& uid, QObject* parent)
		: BaseVersionList(parent), m_uid(uid)
	{
		setObjectName("Version list: " + uid);
	}

	Task::Ptr VersionList::getLoadTask()
	{
		load(Net::Mode::Online);
		return getCurrentTask();
	}

	bool VersionList::isLoaded()
	{
		return BaseEntity::isLoaded();
	}

	const BaseVersionPtr VersionList::at(int i) const
	{
		return m_versions.at(i);
	}
	int VersionList::count() const
	{
		return m_versions.size();
	}

	void VersionList::sortVersions()
	{
		beginResetModel();
		std::sort(m_versions.begin(), m_versions.end(),
				  [](const VersionPtr& a, const VersionPtr& b) {
					  return *a.get() < *b.get();
				  });
		endResetModel();
	}

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

		VersionPtr version = m_versions.at(index.row());

		switch (role) {
			case VersionPointerRole:
				return QVariant::fromValue(
					std::dynamic_pointer_cast<BaseVersion>(version));
			case VersionRole:
			case VersionIdRole:
				return version->version();
			case ParentVersionRole: {
				// FIXME: HACK: this should be generic and be replaced by
				// something else. Anything that is a hard 'equals' dep is a
				// 'parent uid'.
				auto& reqs = version->requirements();
				auto iter = std::find_if(reqs.begin(), reqs.end(),
										 [](const Require& req) {
											 return req.uid == "net.minecraft";
										 });
				if (iter != reqs.end()) {
					return (*iter).equalsVersion;
				}
				return QVariant();
			}
			case TypeRole:
				return version->type();

			case UidRole:
				return version->uid();
			case TimeRole:
				return version->time();
			case RequiresRole:
				return QVariant::fromValue(version->requirements());
			case SortRole:
				return version->rawTime();
			case VersionPtrRole:
				return QVariant::fromValue(version);
			case RecommendedRole:
				return version->isRecommended();
			// FIXME: this should be determined in whatever view/proxy is
			// used... case LatestRole: return version == getLatestStable();
			default:
				return QVariant();
		}
	}

	BaseVersionList::RoleList VersionList::providesRoles() const
	{
		return {VersionPointerRole, VersionRole,  VersionIdRole,
				ParentVersionRole,	TypeRole,	  UidRole,
				TimeRole,			RequiresRole, SortRole,
				RecommendedRole,	LatestRole,	  VersionPtrRole};
	}

	QHash<int, QByteArray> VersionList::roleNames() const
	{
		QHash<int, QByteArray> roles = BaseVersionList::roleNames();
		roles.insert(UidRole, "uid");
		roles.insert(TimeRole, "time");
		roles.insert(SortRole, "sort");
		roles.insert(RequiresRole, "requires");
		return roles;
	}

	QString VersionList::localFilename() const
	{
		return m_uid + "/index.json";
	}

	QString VersionList::humanReadable() const
	{
		return m_name.isEmpty() ? m_uid : m_name;
	}

	VersionPtr VersionList::getVersion(const QString& version)
	{
		VersionPtr out = m_lookup.value(version, nullptr);
		if (!out) {
			out = std::make_shared<Version>(m_uid, version);
			m_lookup[version] = out;
		}
		return out;
	}

	void VersionList::setName(const QString& name)
	{
		m_name = name;
		emit nameChanged(name);
	}

	void VersionList::setVersions(const QVector<VersionPtr>& versions)
	{
		beginResetModel();
		m_versions = versions;
		std::sort(m_versions.begin(), m_versions.end(),
				  [](const VersionPtr& a, const VersionPtr& b) {
					  return a->rawTime() > b->rawTime();
				  });
		for (int i = 0; i < m_versions.size(); ++i) {
			m_lookup.insert(m_versions.at(i)->version(), m_versions.at(i));
			setupAddedVersion(i, m_versions.at(i));
		}

		// FIXME: this is dumb, we have 'recommended' as part of the metadata
		// already...
		auto recommendedIt = std::find_if(
			m_versions.constBegin(), m_versions.constEnd(),
			[](const VersionPtr& ptr) { return ptr->type() == "release"; });
		m_recommended =
			recommendedIt == m_versions.constEnd() ? nullptr : *recommendedIt;
		endResetModel();
	}

	void VersionList::parse(const QJsonObject& obj)
	{
		parseVersionList(obj, this);
	}

	// FIXME: this is dumb, we have 'recommended' as part of the metadata
	// already...
	static const Meta::VersionPtr& getBetterVersion(const Meta::VersionPtr& a,
													const Meta::VersionPtr& b)
	{
		if (!a)
			return b;
		if (!b)
			return a;
		if (a->type() == b->type()) {
			// newer of same type wins
			return (a->rawTime() > b->rawTime() ? a : b);
		}
		// 'release' type wins
		return (a->type() == "release" ? a : b);
	}

	void VersionList::mergeFromIndex(const VersionListPtr& other)
	{
		if (m_name != other->m_name) {
			setName(other->m_name);
		}
	}

	void VersionList::merge(const VersionListPtr& other)
	{
		if (m_name != other->m_name) {
			setName(other->m_name);
		}

		// TODO: do not reset the whole model. maybe?
		beginResetModel();
		m_versions.clear();
		if (other->m_versions.isEmpty()) {
			qWarning() << "Empty list loaded ...";
		}
		for (const VersionPtr& version : other->m_versions) {
			// we already have the version. merge the contents
			if (m_lookup.contains(version->version())) {
				m_lookup.value(version->version())->mergeFromList(version);
			} else {
				m_lookup.insert(version->uid(), version);
			}
			// connect it.
			setupAddedVersion(m_versions.size(), version);
			m_versions.append(version);
			m_recommended = getBetterVersion(m_recommended, version);
		}
		endResetModel();
	}

	void VersionList::setupAddedVersion(const int row,
										const VersionPtr& version)
	{
		// FIXME: do not disconnect from everythin, disconnect only the lambdas
		// here
		version->disconnect();
		connect(version.get(), &Version::requiresChanged, this, [this, row]() {
			emit dataChanged(index(row), index(row),
							 QVector<int>() << RequiresRole);
		});
		connect(version.get(), &Version::timeChanged, this, [this, row]() {
			emit dataChanged(index(row), index(row),
							 QVector<int>() << TimeRole << SortRole);
		});
		connect(version.get(), &Version::typeChanged, this, [this, row]() {
			emit dataChanged(index(row), index(row),
							 QVector<int>() << TypeRole);
		});
	}

	BaseVersionPtr VersionList::getRecommended() const
	{
		return m_recommended;
	}

} // namespace Meta