/* 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 "PackManifest.h"
#include "Json.h"

static void loadFileV1(Flame::File& f, QJsonObject& file)
{
	f.projectId = Json::requireInteger(file, "projectID");
	f.fileId = Json::requireInteger(file, "fileID");
	f.required = Json::ensureBoolean(file, QString("required"), true);
}

static void loadModloaderV1(Flame::Modloader& m, QJsonObject& modLoader)
{
	m.id = Json::requireString(modLoader, "id");
	m.primary = Json::ensureBoolean(modLoader, QString("primary"), false);
}

static void loadMinecraftV1(Flame::Minecraft& m, QJsonObject& minecraft)
{
	m.version = Json::requireString(minecraft, "version");
	// extra libraries... apparently only used for a custom Minecraft launcher
	// in the 1.2.5 FTB retro pack intended use is likely hardcoded in the
	// 'Flame' client, the manifest says nothing
	m.libraries =
		Json::ensureString(minecraft, QString("libraries"), QString());
	auto arr = Json::ensureArray(minecraft, "modLoaders", QJsonArray());
	for (QJsonValueRef item : arr) {
		auto obj = Json::requireObject(item);
		Flame::Modloader loader;
		loadModloaderV1(loader, obj);
		m.modLoaders.append(loader);
	}
}

static void loadManifestV1(Flame::Manifest& m, QJsonObject& manifest)
{
	auto mc = Json::requireObject(manifest, "minecraft");
	loadMinecraftV1(m.minecraft, mc);
	m.name = Json::ensureString(manifest, QString("name"), "Unnamed");
	m.version = Json::ensureString(manifest, QString("version"), QString());
	m.author =
		Json::ensureString(manifest, QString("author"), "Anonymous Coward");
	auto arr = Json::ensureArray(manifest, "files", QJsonArray());
	for (QJsonValueRef item : arr) {
		auto obj = Json::requireObject(item);
		Flame::File file;
		loadFileV1(file, obj);
		m.files.append(file);
	}
	m.overrides = Json::ensureString(manifest, "overrides", "overrides");
}

void Flame::loadManifest(Flame::Manifest& m, const QString& filepath)
{
	auto doc = Json::requireDocument(filepath);
	auto obj = Json::requireObject(doc);
	m.manifestType = Json::requireString(obj, "manifestType");
	if (m.manifestType != "minecraftModpack") {
		throw JSONValidationError("Not a modpack manifest!");
	}
	m.manifestVersion = Json::requireInteger(obj, "manifestVersion");
	if (m.manifestVersion != 1) {
		throw JSONValidationError(
			QString("Unknown manifest version (%1)").arg(m.manifestVersion));
	}
	loadManifestV1(m, obj);
}

bool Flame::File::parseFromBytes(const QByteArray& bytes)
{
	auto doc = Json::requireDocument(bytes);
	auto obj = Json::requireObject(doc);
	// result code signifies true failure.
	if (obj.contains("code")) {
		qCritical() << "Resolving of" << projectId << fileId
					<< "failed because of a negative result:";
		qCritical() << bytes;
		return false;
	}
	// CurseForge API v1 wraps the file object in "data"
	if (obj.contains("data")) {
		obj = Json::requireObject(obj, "data");
	}
	// Support both old cursemeta (FileNameOnDisk) and CurseForge API v1
	// (fileName) field names
	fileName = Json::ensureString(obj, "fileName", QString());
	if (fileName.isEmpty()) {
		fileName = Json::requireString(obj, "FileNameOnDisk");
	}
	QString rawUrl = Json::ensureString(obj, "downloadUrl", QString());
	if (rawUrl.isEmpty()) {
		rawUrl = Json::ensureString(obj, "DownloadURL", QString());
	}
	if (rawUrl.isEmpty()) {
		// Mod has disabled third-party downloads — will be handled via browser
		// download
		qWarning() << "Mod" << projectId << fileId << "(" << fileName
				   << ") has no download URL (restricted)."
				   << "Will require browser download.";
		resolved = false;
		return true;
	}
	url = QUrl(rawUrl, QUrl::TolerantMode);
	if (!url.isValid()) {
		throw JSONValidationError(QString("Invalid URL: %1").arg(rawUrl));
	}
	// This is a piece of a Flame project JSON pulled out into the file metadata
	// (here) for convenience It is also optional
	QJsonObject projObj = Json::ensureObject(obj, "_Project", {});
	if (!projObj.isEmpty()) {
		QString strType =
			Json::ensureString(projObj, "PackageType", "mod").toLower();
		if (strType == "singlefile") {
			type = File::Type::SingleFile;
		} else if (strType == "ctoc") {
			type = File::Type::Ctoc;
		} else if (strType == "cmod2") {
			type = File::Type::Cmod2;
		} else if (strType == "mod") {
			type = File::Type::Mod;
		} else if (strType == "folder") {
			type = File::Type::Folder;
		} else if (strType == "modpack") {
			type = File::Type::Modpack;
		} else {
			qCritical() << "Resolving of" << projectId << fileId
						<< "failed because of unknown file type:" << strType;
			type = File::Type::Unknown;
			return false;
		}
		targetFolder = Json::ensureString(projObj, "Path", "mods");
	}
	resolved = true;
	return true;
}