/* 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/>.
 */

#include "FMLLibrariesTask.h"

#include "FileSystem.h"
#include "minecraft/VersionFilterData.h"
#include "minecraft/MinecraftInstance.h"
#include "minecraft/PackProfile.h"

#include "BuildConfig.h"
#include "Application.h"

FMLLibrariesTask::FMLLibrariesTask(MinecraftInstance* inst)
{
	m_inst = inst;
}
void FMLLibrariesTask::executeTask()
{
	// Get the mod list
	MinecraftInstance* inst = (MinecraftInstance*)m_inst;
	auto components = inst->getPackProfile();
	auto profile = components->getProfile();

	if (!profile->hasTrait("legacyFML")) {
		emitSucceeded();
		return;
	}

	QString version = components->getComponentVersion("net.minecraft");
	auto& fmlLibsMapping = g_VersionFilterData.fmlLibsMapping;
	if (!fmlLibsMapping.contains(version)) {
		emitSucceeded();
		return;
	}

	auto& libList = fmlLibsMapping[version];

	// determine if we need some libs for FML or forge
	setStatus(tr("Checking for FML libraries..."));
	if (!components->getComponent("net.minecraftforge")) {
		emitSucceeded();
		return;
	}

	// now check the lib folder inside the instance for files.
	for (auto& lib : libList) {
		QFileInfo libInfo(FS::PathCombine(inst->libDir(), lib.filename));
		if (libInfo.exists())
			continue;
		fmlLibsToProcess.append(lib);
	}

	// if everything is in place, there's nothing to do here...
	if (fmlLibsToProcess.isEmpty()) {
		emitSucceeded();
		return;
	}

	// download missing libs to our place
	setStatus(tr("Downloading FML libraries..."));
	auto dljob = new NetJob("FML libraries", APPLICATION->network());
	auto metacache = APPLICATION->metacache();
	for (auto& lib : fmlLibsToProcess) {
		auto entry = metacache->resolveEntry("fmllibs", lib.filename);
		QString urlString = BuildConfig.FMLLIBS_BASE_URL + lib.filename;
		dljob->addNetAction(Net::Download::makeCached(QUrl(urlString), entry));
	}

	connect(dljob, &NetJob::succeeded, this,
			&FMLLibrariesTask::fmllibsFinished);
	connect(dljob, &NetJob::failed, this, &FMLLibrariesTask::fmllibsFailed);
	connect(dljob, &NetJob::progress, this, &FMLLibrariesTask::progress);
	downloadJob.reset(dljob);
	downloadJob->start();
}

bool FMLLibrariesTask::canAbort() const
{
	return true;
}

void FMLLibrariesTask::fmllibsFinished()
{
	downloadJob.reset();
	if (!fmlLibsToProcess.isEmpty()) {
		setStatus(tr("Copying FML libraries into the instance..."));
		MinecraftInstance* inst = (MinecraftInstance*)m_inst;
		auto metacache = APPLICATION->metacache();
		int index = 0;
		for (auto& lib : fmlLibsToProcess) {
			progress(index, fmlLibsToProcess.size());
			auto entry = metacache->resolveEntry("fmllibs", lib.filename);
			auto path = FS::PathCombine(inst->libDir(), lib.filename);
			if (!FS::ensureFilePathExists(path)) {
				emitFailed(tr(
					"Failed creating FML library folder inside the instance."));
				return;
			}
			if (!QFile::copy(entry->getFullPath(),
							 FS::PathCombine(inst->libDir(), lib.filename))) {
				emitFailed(tr("Failed copying Forge/FML library: %1.")
							   .arg(lib.filename));
				return;
			}
			index++;
		}
		progress(index, fmlLibsToProcess.size());
	}
	emitSucceeded();
}
void FMLLibrariesTask::fmllibsFailed(QString reason)
{
	QStringList failed = downloadJob->getFailedFiles();
	QString failed_all = failed.join("\n");
	emitFailed(tr("Failed to download the following "
				  "files:\n%1\n\nReason:%2\nPlease try again.")
				   .arg(failed_all, reason));
}

bool FMLLibrariesTask::abort()
{
	if (downloadJob) {
		return downloadJob->abort();
	} else {
		qWarning() << "Prematurely aborted FMLLibrariesTask";
	}
	return true;
}