/**
 * Relational pipes (library)
 * Copyright © 2019 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 Lesser General Public License as published by the Free Software Foundation;
 *    version 3 of the License or (at your option)
 *  - GNU General Public License as published by the Free Software Foundation;
 *    version 2 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/>.
 */

#include <memory>

#include "../include/relpipe/common/text/TextCodec.h"

namespace relpipe {
namespace common {
namespace text {

class TextCodec::TextCodecInternal {
private:
public:
	static const std::string UTF8;
	static const std::string DEFAULT;
	Iconv* bytesToText;
	Iconv* textToBytes;
	//std::unique_ptr<Iconv> bytesToText;
	//std::unique_ptr<Iconv> textToBytes;
	bool sameEncoding = false;

	TextCodecInternal(const std::string& encoding) {
		// TODO: set sameEncoding = true if $LANG or current locale is same as encoding
		bytesToText = new Iconv(encoding, DEFAULT);
		textToBytes = new Iconv(DEFAULT, encoding);
		//bytesToText.reset(new Iconv(encoding, DEFAULT));
		//textToBytes.reset(new Iconv(DEFAULT, encoding));
	}

	virtual ~TextCodecInternal() {
		delete bytesToText;
		delete textToBytes;
	}
};

const std::string TextCodec::TextCodecInternal::UTF8 = "UTF-8";
const std::string TextCodec::TextCodecInternal::DEFAULT = "";

TextCodec::TextCodec(const std::string& encoding) {
	internal = new TextCodec::TextCodecInternal(encoding);
}

TextCodec::TextCodec() : TextCodec(TextCodec::TextCodecInternal::UTF8) {
}

TextCodec::~TextCodec() {
	delete internal;
}

std::string TextCodec::fromBytes(std::string bytes) {
	if (internal->sameEncoding) return bytes;
	else return internal->bytesToText->convert(bytes);
}

std::string TextCodec::toBytes(std::string text) {
	if (internal->sameEncoding) return text;
	else return internal->textToBytes->convert(text);
}

}
}
}