/**

 * ShaderShark

 * Copyright © 2023 František Kučera (Frantovo.cz, GlobalCode.info)

 *

 * 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, version 3 of the License.

 *

 * 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 <http://www.gnu.org/licenses/>.

 */

#pragma once

#include <memory>

#include <string>

#include "Buffer.h"

class XAttrs {

public:

	class Null;

	class Attribute {

	public:

		virtual ~Attribute();

		const std::string getName();

		const std::string getValue(bool reload = false);

		bool exists(bool reload = false);

		bool missing(bool reload = false);

		Attribute& operator=(const std::string& value);

		Attribute& operator=(const Attribute& value);

		operator std::string();

		friend std::ostream& operator<<(std::ostream& s, Attribute& a);

		friend std::ostream& operator>>(Attribute& a, std::ostream& s);

	private:

		class Impl;

		std::shared_ptr<Impl> impl;

		Attribute();

		friend XAttrs;

		friend Null;

	};

	class Null : public Attribute {

	public:

		Null();

	};

	XAttrs(const std::string& fileName, const std::string& nameSpace = "user");

	virtual ~XAttrs();

	const std::string getFileName() const;

	Attribute& operator[](std::string name);

	Attribute& operator[](std::size_t index);

	size_t size(bool reload = false);

	Attribute* begin();

	Attribute* end();

private:

	class Impl;

	std::shared_ptr<Impl> impl;

	friend Attribute;

};