/*
 * Copyright (c) 2014 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Swiften/Parser/PayloadParsers/JingleFileTransferFileInfoParser.h>

#include <boost/optional.hpp>
#include <boost/lexical_cast.hpp>

#include <Swiften/Base/DateTime.h>
#include <Swiften/StringCodecs/Base64.h>

namespace Swift {

JingleFileTransferFileInfoParser::JingleFileTransferFileInfoParser() : level(0) {	
}

template<typename T> boost::optional<T> safeLexicalCast(const std::string& str) {
	boost::optional<T> ret;
	try {
		ret = boost::lexical_cast<T>(str);
	} catch (boost::bad_lexical_cast &) {

	}
	return ret;
}

void JingleFileTransferFileInfoParser::handleStartElement(const std::string& element, const std::string&, const AttributeMap& attributes) {
	charData.clear();
	if (element == "hash") {
		hashAlg = attributes.getAttributeValue("algo").get_value_or("");
	}
	else if (element == "range") {
		rangeOffset = safeLexicalCast<boost::uintmax_t>(attributes.getAttributeValue("offset").get_value_or(""));
	}

	++level;
}

void JingleFileTransferFileInfoParser::handleEndElement(const std::string& element, const std::string&) {
	--level;
	if (level == 1) {
		if (element == "date") {
			getPayloadInternal()->setDate(stringToDateTime(charData));
		}
		else if (element == "desc") {
			getPayloadInternal()->setDescription(charData);
		}
		else if (element == "media-type") {
			getPayloadInternal()->setMediaType(charData);
		}
		else if (element == "name") {
			getPayloadInternal()->setName(charData);
		}
		else if (element == "size") {
			boost::optional<boost::uintmax_t> size = safeLexicalCast<boost::uintmax_t>(charData);
			if (size) {
				getPayloadInternal()->setSize(size.get());
			}
		}
		else if (element == "range") {
			getPayloadInternal()->setSupportsRangeRequests(true);
			if (rangeOffset) {
				getPayloadInternal()->setRangeOffset(rangeOffset.get_value_or(0));
			}
		}
		else if (element == "hash") {
			getPayloadInternal()->addHash(HashElement(hashAlg, Base64::decode(charData)));
		}
	}
}

void JingleFileTransferFileInfoParser::handleCharacterData(const std::string& data) {
	charData += data;
}

}