/* 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 2013-2021 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 "Json.h"

#include <QFile>

#include "FileSystem.h"
#include <math.h>

namespace Json
{
	void write(const QJsonDocument& doc, const QString& filename)
	{
		FS::write(filename, doc.toJson());
	}
	void write(const QJsonObject& object, const QString& filename)
	{
		write(QJsonDocument(object), filename);
	}
	void write(const QJsonArray& array, const QString& filename)
	{
		write(QJsonDocument(array), filename);
	}

	QByteArray toBinary(const QJsonObject& obj)
	{
		return QJsonDocument(obj).toJson(QJsonDocument::Compact);
	}
	QByteArray toBinary(const QJsonArray& array)
	{
		return QJsonDocument(array).toJson(QJsonDocument::Compact);
	}
	QByteArray toText(const QJsonObject& obj)
	{
		return QJsonDocument(obj).toJson(QJsonDocument::Compact);
	}
	QByteArray toText(const QJsonArray& array)
	{
		return QJsonDocument(array).toJson(QJsonDocument::Compact);
	}

	static bool isBinaryJson(const QByteArray& data)
	{
		// Binary JSON is no longer supported in Qt6
		Q_UNUSED(data);
		return false;
	}
	QJsonDocument requireDocument(const QByteArray& data, const QString& what)
	{
		if (isBinaryJson(data)) {
			throw JsonException(what +
								": Binary JSON format is no longer supported");
		} else {
			QJsonParseError error;
			QJsonDocument doc = QJsonDocument::fromJson(data, &error);
			if (error.error != QJsonParseError::NoError) {
				throw JsonException(
					what + ": Error parsing JSON: " + error.errorString());
			}
			return doc;
		}
	}
	QJsonDocument requireDocument(const QString& filename, const QString& what)
	{
		return requireDocument(FS::read(filename), what);
	}
	QJsonObject requireObject(const QJsonDocument& doc, const QString& what)
	{
		if (!doc.isObject()) {
			throw JsonException(what + " is not an object");
		}
		return doc.object();
	}
	QJsonArray requireArray(const QJsonDocument& doc, const QString& what)
	{
		if (!doc.isArray()) {
			throw JsonException(what + " is not an array");
		}
		return doc.array();
	}

	void writeString(QJsonObject& to, const QString& key, const QString& value)
	{
		if (!value.isEmpty()) {
			to.insert(key, value);
		}
	}

	void writeStringList(QJsonObject& to, const QString& key,
						 const QStringList& values)
	{
		if (!values.isEmpty()) {
			QJsonArray array;
			for (auto value : values) {
				array.append(value);
			}
			to.insert(key, array);
		}
	}

	template <> QJsonValue toJson<QUrl>(const QUrl& url)
	{
		return QJsonValue(url.toString(QUrl::FullyEncoded));
	}
	template <> QJsonValue toJson<QByteArray>(const QByteArray& data)
	{
		return QJsonValue(QString::fromLatin1(data.toHex()));
	}
	template <> QJsonValue toJson<QDateTime>(const QDateTime& datetime)
	{
		return QJsonValue(datetime.toString(Qt::ISODate));
	}
	template <> QJsonValue toJson<QDir>(const QDir& dir)
	{
		return QDir::current().relativeFilePath(dir.absolutePath());
	}
	template <> QJsonValue toJson<QUuid>(const QUuid& uuid)
	{
		return uuid.toString();
	}
	template <> QJsonValue toJson<QVariant>(const QVariant& variant)
	{
		return QJsonValue::fromVariant(variant);
	}

	template <>
	QByteArray requireIsType<QByteArray>(const QJsonValue& value,
										 const QString& what)
	{
		const QString string = ensureIsType<QString>(value, what);
		// ensure that the string can be safely cast to Latin1
		if (string != QString::fromLatin1(string.toLatin1())) {
			throw JsonException(what + " is not encodable as Latin1");
		}
		return QByteArray::fromHex(string.toLatin1());
	}

	template <>
	QJsonArray requireIsType<QJsonArray>(const QJsonValue& value,
										 const QString& what)
	{
		if (!value.isArray()) {
			throw JsonException(what + " is not an array");
		}
		return value.toArray();
	}

	template <>
	QString requireIsType<QString>(const QJsonValue& value, const QString& what)
	{
		if (!value.isString()) {
			throw JsonException(what + " is not a string");
		}
		return value.toString();
	}

	template <>
	bool requireIsType<bool>(const QJsonValue& value, const QString& what)
	{
		if (!value.isBool()) {
			throw JsonException(what + " is not a bool");
		}
		return value.toBool();
	}

	template <>
	double requireIsType<double>(const QJsonValue& value, const QString& what)
	{
		if (!value.isDouble()) {
			throw JsonException(what + " is not a double");
		}
		return value.toDouble();
	}

	template <>
	int requireIsType<int>(const QJsonValue& value, const QString& what)
	{
		const double doubl = requireIsType<double>(value, what);
		if (fmod(doubl, 1) != 0) {
			throw JsonException(what + " is not an integer");
		}
		return int(doubl);
	}

	template <>
	QDateTime requireIsType<QDateTime>(const QJsonValue& value,
									   const QString& what)
	{
		const QString string = requireIsType<QString>(value, what);
		const QDateTime datetime = QDateTime::fromString(string, Qt::ISODate);
		if (!datetime.isValid()) {
			throw JsonException(what +
								" is not a ISO formatted date/time value");
		}
		return datetime;
	}

	template <>
	QUrl requireIsType<QUrl>(const QJsonValue& value, const QString& what)
	{
		const QString string = ensureIsType<QString>(value, what);
		if (string.isEmpty()) {
			return QUrl();
		}
		const QUrl url = QUrl(string, QUrl::StrictMode);
		if (!url.isValid()) {
			throw JsonException(what + " is not a correctly formatted URL");
		}
		return url;
	}

	template <>
	QDir requireIsType<QDir>(const QJsonValue& value, const QString& what)
	{
		const QString string = requireIsType<QString>(value, what);
		// FIXME: does not handle invalid characters!
		return QDir::current().absoluteFilePath(string);
	}

	template <>
	QUuid requireIsType<QUuid>(const QJsonValue& value, const QString& what)
	{
		const QString string = requireIsType<QString>(value, what);
		const QUuid uuid = QUuid(string);
		if (uuid.toString() != string) // converts back => valid
		{
			throw JsonException(what + " is not a valid UUID");
		}
		return uuid;
	}

	template <>
	QJsonObject requireIsType<QJsonObject>(const QJsonValue& value,
										   const QString& what)
	{
		if (!value.isObject()) {
			throw JsonException(what + " is not an object");
		}
		return value.toObject();
	}

	template <>
	QVariant requireIsType<QVariant>(const QJsonValue& value,
									 const QString& what)
	{
		if (value.isNull() || value.isUndefined()) {
			throw JsonException(what + " is null or undefined");
		}
		return value.toVariant();
	}

	template <>
	QJsonValue requireIsType<QJsonValue>(const QJsonValue& value,
										 const QString& what)
	{
		if (value.isNull() || value.isUndefined()) {
			throw JsonException(what + " is null or undefined");
		}
		return value;
	}

} // namespace Json