/**
 * 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;
};