/*
 * Cppcheck - A tool for static C/C++ code analysis
 * Copyright (C) 2007-2019 Cppcheck team.
 *
 * 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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 <QApplication>
#include <QFile>
#include <QDebug>
#include <QLocale>
#include <QMessageBox>
#include <QSettings>
#include <QFileInfo>
#include "translationhandler.h"


// Provide own translations for standard buttons. This (garbage) code is needed to enforce them to appear in .ts files even after "lupdate gui.pro"
static void unused()
{
// NOTE: Keeping semi-colons at end of macro for style preference
#if ((QT_VERSION >= 0x040000)&&(QT_VERSION < 0x050000))
 Q_UNUSED(QT_TRANSLATE_NOOP("QDialogButtonBox", "OK"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QDialogButtonBox", "Cancel"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QDialogButtonBox", "Close"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QDialogButtonBox", "Save"));
#elif ((QT_VERSION >= 0x050000)&&(QT_VERSION < 0x060000))
 Q_UNUSED(QT_TRANSLATE_NOOP("QPlatformTheme", "OK"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QPlatformTheme", "Cancel"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QPlatformTheme", "Close"));
 Q_UNUSED(QT_TRANSLATE_NOOP("QPlatformTheme", "Save"));
#else
#error Unsupported Qt version.
#endif
}

TranslationHandler::TranslationHandler(QObject *parent) :
 QObject(parent),
 mCurrentLanguage("en"),
 mTranslator(nullptr)
{
 // Add our available languages
 // Keep this list sorted
 addTranslation("Chinese (Simplified)", "cppcheck_zh_CN");
 addTranslation("Dutch", "cppcheck_nl");
 addTranslation("English", "cppcheck_en");
 addTranslation("Finnish", "cppcheck_fi");
 addTranslation("French", "cppcheck_fr");
 addTranslation("German", "cppcheck_de");
 addTranslation("Italian", "cppcheck_it");
 addTranslation("Japanese", "cppcheck_ja");
 addTranslation("Korean", "cppcheck_ko");
 addTranslation("Russian", "cppcheck_ru");
 addTranslation("Serbian", "cppcheck_sr");
 addTranslation("Spanish", "cppcheck_es");
 addTranslation("Swedish", "cppcheck_sv");
}

TranslationHandler::~TranslationHandler()
{
}

const QStringList TranslationHandler::getNames() const
{
 QStringList names;
 foreach (TranslationInfo translation, mTranslations) {
 names.append(translation.mName);
 }
 return names;
}

bool TranslationHandler::setLanguage(const QString &code)
{
 bool failure = false;
 QString error;

 //If English is the language
 if (code == "en") {
 //Just remove all extra translators
 if (mTranslator) {
 qApp->removeTranslator(mTranslator);
 delete mTranslator;
 mTranslator = nullptr;
 }

 mCurrentLanguage = code;
 return true;
 }

 //Make sure the translator is otherwise valid
 int index = getLanguageIndexByCode(code);
 if (index == -1) {
 error = QObject::tr("Unknown language specified!");
 failure = true;
 } else {
 // Make sure there is a translator
 if (!mTranslator && !failure)
 mTranslator = new QTranslator(this);

 //Load the new language
 const QString appPath = QFileInfo(QCoreApplication::applicationFilePath()).canonicalPath();

 QSettings settings;
 QString datadir = settings.value("DATADIR").toString();
 if (datadir.isEmpty())
 datadir = appPath;

 QString translationFile;
 if (QFile::exists(datadir + "/lang/" + mTranslations[index].mFilename + ".qm"))
 translationFile = datadir + "/lang/" + mTranslations[index].mFilename + ".qm";

 else if (QFile::exists(datadir + "/" + mTranslations[index].mFilename + ".qm"))
 translationFile = datadir + "/" + mTranslations[index].mFilename + ".qm";

 else
 translationFile = appPath + "/" + mTranslations[index].mFilename + ".qm";

 if (!mTranslator->load(translationFile) && !failure) {
 //If it failed, lets check if the default file exists
 if (!QFile::exists(translationFile)) {
 error = QObject::tr("Language file %1 not found!");
 error = error.arg(translationFile);
 failure = true;
 }

 //If file exists, there's something wrong with it
 error = QObject::tr("Failed to load translation for language %1 from file %2");
 error = error.arg(mTranslations[index].mName);
 error = error.arg(translationFile);
 }
 }

 if (failure) {
 const QString msg(tr("Failed to change the user interface language:"
 "\n\n%1\n\n"
 "The user interface language has been reset to English. Open "
 "the Preferences-dialog to select any of the available "
 "languages.").arg(error));
 QMessageBox msgBox(QMessageBox::Warning,
 tr("Cppcheck"),
 msg,
 QMessageBox::Ok);
 msgBox.exec();
 return false;
 }

 qApp->installTranslator(mTranslator);

 mCurrentLanguage = code;

 return true;
}

QString TranslationHandler::getCurrentLanguage() const
{
 return mCurrentLanguage;
}

QString TranslationHandler::suggestLanguage() const
{
 //Get language from system locale's name ie sv_SE or zh_CN
 QString language = QLocale::system().name();
 //qDebug()<<"Your language is"<<language;

 //And see if we can find it from our list of language files
 int index = getLanguageIndexByCode(language);

 //If nothing found, return English
 if (index < 0) {
 return "en";
 }

 return language;
}

void TranslationHandler::addTranslation(const char *name, const char *filename)
{
 TranslationInfo info;
 info.mName = name;
 info.mFilename = filename;
 int codeLength = QString(filename).length() - QString(filename).indexOf('_') - 1;
 info.mCode = QString(filename).right(codeLength);
 mTranslations.append(info);
}

int TranslationHandler::getLanguageIndexByCode(const QString &code) const
{
 int index = -1;
 for (int i = 0; i < mTranslations.size(); i++) {
 if (mTranslations[i].mCode == code) {
 index = i;
 break;
 } else if (mTranslations[i].mCode == code.left(2)) {
 index = i;
 break;
 }
 }
 return index;
}