/* 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 "OneSixVersionFormat.h"
#include <Json.h>
#include "minecraft/ParseUtils.h"
#include <minecraft/MojangVersionFormat.h>

using namespace Json;

static void readString(const QJsonObject& root, const QString& key,
					   QString& variable)
{
	if (root.contains(key)) {
		variable = requireString(root.value(key));
	}
}

LibraryPtr OneSixVersionFormat::libraryFromJson(ProblemContainer& problems,
												const QJsonObject& libObj,
												const QString& filename)
{
	LibraryPtr out =
		MojangVersionFormat::libraryFromJson(problems, libObj, filename);
	readString(libObj, "MMC-hint", out->m_hint);
	readString(libObj, "MMC-absulute_url", out->m_absoluteURL);
	readString(libObj, "MMC-absoluteUrl", out->m_absoluteURL);
	readString(libObj, "MMC-filename", out->m_filename);
	readString(libObj, "MMC-displayname", out->m_displayname);
	return out;
}

QJsonObject OneSixVersionFormat::libraryToJson(Library* library)
{
	QJsonObject libRoot = MojangVersionFormat::libraryToJson(library);
	if (library->m_absoluteURL.size())
		libRoot.insert("MMC-absoluteUrl", library->m_absoluteURL);
	if (library->m_hint.size())
		libRoot.insert("MMC-hint", library->m_hint);
	if (library->m_filename.size())
		libRoot.insert("MMC-filename", library->m_filename);
	if (library->m_displayname.size())
		libRoot.insert("MMC-displayname", library->m_displayname);
	return libRoot;
}

VersionFilePtr OneSixVersionFormat::versionFileFromJson(
	const QJsonDocument& doc, const QString& filename, const bool requireOrder)
{
	VersionFilePtr out(new VersionFile());
	if (doc.isEmpty() || doc.isNull()) {
		throw JSONValidationError(filename + " is empty or null");
	}
	if (!doc.isObject()) {
		throw JSONValidationError(filename + " is not an object");
	}

	QJsonObject root = doc.object();

	Meta::MetadataVersion formatVersion = Meta::parseFormatVersion(root, false);
	switch (formatVersion) {
		case Meta::MetadataVersion::InitialRelease:
			break;
		case Meta::MetadataVersion::Invalid:
			throw JSONValidationError(filename +
									  " does not contain a recognizable "
									  "version of the metadata format.");
	}

	if (requireOrder) {
		if (root.contains("order")) {
			out->order = requireInteger(root.value("order"));
		} else {
			// FIXME: evaluate if we don't want to throw exceptions here instead
			qCritical() << filename << "doesn't contain an order field";
		}
	}

	out->name = root.value("name").toString();

	if (root.contains("uid")) {
		out->uid = root.value("uid").toString();
	} else {
		out->uid = root.value("fileId").toString();
	}

	out->version = root.value("version").toString();

	MojangVersionFormat::readVersionProperties(root, out.get());

	// added for legacy Minecraft window embedding, TODO: remove
	readString(root, "appletClass", out->appletClass);

	if (root.contains("+tweakers")) {
		for (auto tweakerVal : requireArray(root.value("+tweakers"))) {
			out->addTweakers.append(requireString(tweakerVal));
		}
	}

	if (root.contains("+traits")) {
		for (auto tweakerVal : requireArray(root.value("+traits"))) {
			out->traits.insert(requireString(tweakerVal));
		}
	}

	if (root.contains("jarMods")) {
		for (auto libVal : requireArray(root.value("jarMods"))) {
			QJsonObject libObj = requireObject(libVal);
			// parse the jarmod
			auto lib =
				OneSixVersionFormat::jarModFromJson(*out, libObj, filename);
			// and add to jar mods
			out->jarMods.append(lib);
		}
	} else if (root.contains(
				   "+jarMods")) // DEPRECATED: old style '+jarMods' are only
								// here for backwards compatibility
	{
		for (auto libVal : requireArray(root.value("+jarMods"))) {
			QJsonObject libObj = requireObject(libVal);
			// parse the jarmod
			auto lib = OneSixVersionFormat::plusJarModFromJson(
				*out, libObj, filename, out->name);
			// and add to jar mods
			out->jarMods.append(lib);
		}
	}

	if (root.contains("mods")) {
		for (auto libVal : requireArray(root.value("mods"))) {
			QJsonObject libObj = requireObject(libVal);
			// parse the jarmod
			auto lib = OneSixVersionFormat::modFromJson(*out, libObj, filename);
			// and add to jar mods
			out->mods.append(lib);
		}
	}

	auto readLibs = [&](const char* which, QList<LibraryPtr>& outList) {
		for (auto libVal : requireArray(root.value(which))) {
			QJsonObject libObj = requireObject(libVal);
			// parse the library
			auto lib = libraryFromJson(*out, libObj, filename);
			outList.append(lib);
		}
	};
	bool hasPlusLibs = root.contains("+libraries");
	bool hasLibs = root.contains("libraries");
	if (hasPlusLibs && hasLibs) {
		out->addProblem(
			ProblemSeverity::Warning,
			QObject::tr("Version file has both '+libraries' and 'libraries'. "
						"This is no longer supported."));
		readLibs("libraries", out->libraries);
		readLibs("+libraries", out->libraries);
	} else if (hasLibs) {
		readLibs("libraries", out->libraries);
	} else if (hasPlusLibs) {
		readLibs("+libraries", out->libraries);
	}

	if (root.contains("mavenFiles")) {
		readLibs("mavenFiles", out->mavenFiles);
	}

	// if we have mainJar, just use it
	if (root.contains("mainJar")) {
		QJsonObject libObj = requireObject(root, "mainJar");
		out->mainJar = libraryFromJson(*out, libObj, filename);
	}
	// else reconstruct it from downloads and id ... if that's available
	else if (!out->minecraftVersion.isEmpty()) {
		auto lib = std::make_shared<Library>();
		lib->setRawName(
			GradleSpecifier(QString("com.mojang:minecraft:%1:client")
								.arg(out->minecraftVersion)));
		// we have a reliable client download, use it.
		if (out->mojangDownloads.contains("client")) {
			auto LibDLInfo = std::make_shared<MojangLibraryDownloadInfo>();
			LibDLInfo->artifact = out->mojangDownloads["client"];
			lib->setMojangDownloadInfo(LibDLInfo);
		}
		// we got nothing...
		else {
			out->addProblem(
				ProblemSeverity::Error,
				QObject::tr(
					"URL for the main jar could not be determined - Mojang "
					"removed the server that we used as fallback."));
		}
		out->mainJar = lib;
	}

	if (root.contains("requires")) {
		Meta::parseRequires(root, &out->requirements);
	}
	QString dependsOnMinecraftVersion = root.value("mcVersion").toString();
	if (!dependsOnMinecraftVersion.isEmpty()) {
		Meta::Require mcReq;
		mcReq.uid = "net.minecraft";
		mcReq.equalsVersion = dependsOnMinecraftVersion;
		if (out->requirements.count(mcReq) == 0) {
			out->requirements.insert(mcReq);
		}
	}
	if (root.contains("conflicts")) {
		Meta::parseRequires(root, &out->conflicts);
	}
	if (root.contains("volatile")) {
		out->m_volatile = requireBoolean(root, "volatile");
	}

	/* removed features that shouldn't be used */
	if (root.contains("tweakers")) {
		out->addProblem(
			ProblemSeverity::Error,
			QObject::tr(
				"Version file contains unsupported element 'tweakers'"));
	}
	if (root.contains("-libraries")) {
		out->addProblem(
			ProblemSeverity::Error,
			QObject::tr(
				"Version file contains unsupported element '-libraries'"));
	}
	if (root.contains("-tweakers")) {
		out->addProblem(
			ProblemSeverity::Error,
			QObject::tr(
				"Version file contains unsupported element '-tweakers'"));
	}
	if (root.contains("-minecraftArguments")) {
		out->addProblem(ProblemSeverity::Error,
						QObject::tr("Version file contains unsupported element "
									"'-minecraftArguments'"));
	}
	if (root.contains("+minecraftArguments")) {
		out->addProblem(ProblemSeverity::Error,
						QObject::tr("Version file contains unsupported element "
									"'+minecraftArguments'"));
	}
	return out;
}

QJsonDocument
OneSixVersionFormat::versionFileToJson(const VersionFilePtr& patch)
{
	QJsonObject root;
	writeString(root, "name", patch->name);

	writeString(root, "uid", patch->uid);

	writeString(root, "version", patch->version);

	Meta::serializeFormatVersion(root, Meta::MetadataVersion::InitialRelease);

	MojangVersionFormat::writeVersionProperties(patch.get(), root);

	if (patch->mainJar) {
		root.insert("mainJar", libraryToJson(patch->mainJar.get()));
	}
	writeString(root, "appletClass", patch->appletClass);
	writeStringList(root, "+tweakers", patch->addTweakers);
	writeStringList(root, "+traits", patch->traits.values());
	if (!patch->libraries.isEmpty()) {
		QJsonArray array;
		for (auto value : patch->libraries) {
			array.append(OneSixVersionFormat::libraryToJson(value.get()));
		}
		root.insert("libraries", array);
	}
	if (!patch->mavenFiles.isEmpty()) {
		QJsonArray array;
		for (auto value : patch->mavenFiles) {
			array.append(OneSixVersionFormat::libraryToJson(value.get()));
		}
		root.insert("mavenFiles", array);
	}
	if (!patch->jarMods.isEmpty()) {
		QJsonArray array;
		for (auto value : patch->jarMods) {
			array.append(OneSixVersionFormat::jarModtoJson(value.get()));
		}
		root.insert("jarMods", array);
	}
	if (!patch->mods.isEmpty()) {
		QJsonArray array;
		for (auto value : patch->jarMods) {
			array.append(OneSixVersionFormat::modtoJson(value.get()));
		}
		root.insert("mods", array);
	}
	if (!patch->requirements.empty()) {
		Meta::serializeRequires(root, &patch->requirements, "requires");
	}
	if (!patch->conflicts.empty()) {
		Meta::serializeRequires(root, &patch->conflicts, "conflicts");
	}
	if (patch->m_volatile) {
		root.insert("volatile", true);
	}
	// write the contents to a json document.
	{
		QJsonDocument out;
		out.setObject(root);
		return out;
	}
}

LibraryPtr OneSixVersionFormat::plusJarModFromJson(ProblemContainer& problems,
												   const QJsonObject& libObj,
												   const QString& filename,
												   const QString& originalName)
{
	LibraryPtr out(new Library());
	if (!libObj.contains("name")) {
		throw JSONValidationError(
			filename + "contains a jarmod that doesn't have a 'name' field");
	}

	// just make up something unique on the spot for the library name.
	auto uuid = QUuid::createUuid();
	QString id = uuid.toString().remove('{').remove('}');
	out->setRawName(GradleSpecifier("org.projecttick.jarmods:" + id + ":1"));

	// filename override is the old name
	out->setFilename(libObj.value("name").toString());

	// it needs to be local, it is stored in the instance jarmods folder
	out->setHint("local");

	// read the original name if present - some versions did not set it
	// it is the original jar mod filename before it got renamed at the point of
	// addition
	auto displayName = libObj.value("originalName").toString();
	if (displayName.isEmpty()) {
		auto fixed = originalName;
		fixed.remove(" (jar mod)");
		out->setDisplayName(fixed);
	} else {
		out->setDisplayName(displayName);
	}
	return out;
}

LibraryPtr OneSixVersionFormat::jarModFromJson(ProblemContainer& problems,
											   const QJsonObject& libObj,
											   const QString& filename)
{
	return libraryFromJson(problems, libObj, filename);
}

QJsonObject OneSixVersionFormat::jarModtoJson(Library* jarmod)
{
	return libraryToJson(jarmod);
}

LibraryPtr OneSixVersionFormat::modFromJson(ProblemContainer& problems,
											const QJsonObject& libObj,
											const QString& filename)
{
	return libraryFromJson(problems, libObj, filename);
}

QJsonObject OneSixVersionFormat::modtoJson(Library* jarmod)
{
	return libraryToJson(jarmod);
}