/* The contents of this file are subject to the Mozilla Public License Version 

 * 1.1 (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.mozilla.org/MPL/

 * 

 * Software distributed under the License is distributed on an "AS IS" basis,

 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License

 * for the specific language governing rights and limitations under the

 * License.

 * 

 * The Original Code is Libvoikko: Library of natural language processing tools.

 * The Initial Developer of the Original Code is Harri Pitkänen <hatapitk@iki.fi>.

 * Portions created by the Initial Developer are Copyright (C) 2010 - 2015

 * the Initial Developer. All Rights Reserved.

 * 

 * Alternatively, the contents of this file may be used under the terms of

 * either the GNU General Public License Version 2 or later (the "GPL"), or

 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),

 * in which case the provisions of the GPL or the LGPL are applicable instead

 * of those above. If you wish to allow use of your version of this file only

 * under the terms of either the GPL or the LGPL, and not to allow others to

 * use your version of this file under the terms of the MPL, indicate your

 * decision by deleting the provisions above and replace them with the notice

 * and other provisions required by the GPL or the LGPL. If you do not delete

 * the provisions above, a recipient may use your version of this file under

 * the terms of any one of the MPL, the GPL or the LGPL.

 *********************************************************************************/

#include "setup/LanguageTag.hpp"

using namespace std;

namespace libvoikko { namespace setup {

LanguageTag::LanguageTag() :

	language(""),

	script(""),

	privateUse("") {

}

LanguageTag::LanguageTag(const LanguageTag & languageTag) :

	language(languageTag.language),

	script(languageTag.script),

	privateUse(languageTag.privateUse) {

}

static void lowercaseTagPart(string & tagPart) {

	for (size_t i = 0; i < tagPart.size(); ++i) {

		char current = tagPart.at(i);

		if (current >= 65 && current <= 90) {

			tagPart[i] = current + 32;

		}

	}

}

const string & LanguageTag::getLanguage() const {

	return language;

}

void LanguageTag::setLanguage(const string & language) {

	size_t splitPos = language.find("_");

	if (splitPos != string::npos) {

		// if geographical area (such as FI in fi_FI) is given, discard it

		this->language = language.substr(0, splitPos);

	} else {

		this->language = language;

	}

	lowercaseTagPart(this->language);

}

const string & LanguageTag::getScript() const {

	return script;

}

void LanguageTag::setScript(const string & script) {

	if (script.length() == 4) {

		this->script = script;

	}

}

const string & LanguageTag::getPrivateUse() const {

	return privateUse;

}

void LanguageTag::setPrivateUse(const string & privateUse) {

	this->privateUse = privateUse;

	for (size_t hyphenPos = this->privateUse.find("-"); hyphenPos != string::npos;

	     hyphenPos = this->privateUse.find("-")) {

		this->privateUse.erase(hyphenPos, 1);

	}

	lowercaseTagPart(this->privateUse);

}

void LanguageTag::setLanguageAndScript(const string & languageAndScript) {

	size_t splitPos = languageAndScript.find("-");

	if (splitPos != string::npos) {

		// TODO: the trailing part is script only if it is four letters long

		// We don't support other components for now so we just accept is as script anyway.

		setLanguage(languageAndScript.substr(0, splitPos));

		setScript(languageAndScript.substr(splitPos + 1));

	}

	else {

		setLanguage(languageAndScript);

	}

}

void LanguageTag::setBcp47(const string & bcp) {

	size_t splitPos = bcp.find("-x-");

	if (splitPos != string::npos) {

		setLanguageAndScript(bcp.substr(0, splitPos));

		setPrivateUse(bcp.substr(splitPos + 3));

	}

	else {

		setLanguageAndScript(bcp);

	}

}

string LanguageTag::toBcp47() const {

	string tag = this->language;

	if (!this->script.empty()) {

		tag.append("-");

		tag.append(this->script);

	}

	if (!this->privateUse.empty()) {

		tag.append("-x-");

		tag.append(this->privateUse);

	}

	return tag;

}

bool operator<(const LanguageTag & l1, const LanguageTag & l2) {

	if (l1.language != l2.language) {

		return l1.language < l2.language;

	}

	if (l1.script != l2.script) {

		return l1.script < l2.script;

	}

	return l1.privateUse < l2.privateUse;

}

} }