/** \file LanguagesManager.cpp
\brief Define the class to manage and load the languages
\author alpha_one_x86
\licence GPL3, see the file COPYING */

#include <QDir>
#include <QLibraryInfo>

#include "LanguagesManager.h"
#include "FacilityEngine.h"
#include "cpp11addition.h"

/// \brief Create the manager and load the defaults variables
LanguagesManager::LanguagesManager()
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    //load the rest
    std::vector<std::string> resourcesPaths=ResourcesManager::resourcesManager->getReadPath();
    unsigned int index=0;
    while(index<resourcesPaths.size())
    {
        std::string composedTempPath=resourcesPaths.at(index)+"Languages"+FacilityEngine::separator();
        QDir LanguagesConfiguration(QString::fromStdString(composedTempPath));
        if(LanguagesConfiguration.exists())
            languagePath.push_back(composedTempPath);
        index++;
    }
    //load the plugins
    if(PluginsManager::pluginsManager!=NULL)
    {
        PluginsManager::pluginsManager->lockPluginListEdition();
        connect(this,&LanguagesManager::previouslyPluginAdded,		this,	&LanguagesManager::onePluginAdded,Qt::QueuedConnection);
        connect(PluginsManager::pluginsManager,&PluginsManager::onePluginAdded,this,	&LanguagesManager::onePluginAdded,Qt::QueuedConnection);
        #ifndef ULTRACOPIER_PLUGIN_ALL_IN_ONE
        connect(PluginsManager::pluginsManager,&PluginsManager::onePluginWillBeRemoved,	this,	&LanguagesManager::onePluginWillBeRemoved,Qt::DirectConnection);
        #endif
        connect(PluginsManager::pluginsManager,&PluginsManager::pluginListingIsfinish,		this,	&LanguagesManager::allPluginIsLoaded,Qt::QueuedConnection);
        std::vector<PluginsAvailable> list=PluginsManager::pluginsManager->getPluginsByCategory(PluginType_Languages);
        foreach(PluginsAvailable currentPlugin,list)
            emit previouslyPluginAdded(currentPlugin);
        PluginsManager::pluginsManager->unlockPluginListEdition();
    }
    else
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Critical,"plugin manager null");
    //load the GUI option
    if(OptionEngine::optionEngine!=NULL)
    {
        std::vector<std::pair<std::string, std::string> > KeysList;
        KeysList.push_back(std::pair<std::string, std::string>("Language","en"));
        KeysList.push_back(std::pair<std::string, std::string>("Language_force","false"));
        OptionEngine::optionEngine->addOptionGroup("Language",KeysList);
    //	connect(this,	&LanguagesManager::newLanguageLoaded,			plugins,&PluginsManager::refreshPluginList);
    //	connect(this,	&LanguagesManager::newLanguageLoaded,			this,&LanguagesManager::retranslateTheUI);
        connect(OptionEngine::optionEngine,&OptionEngine::newOptionValue,				this,	&LanguagesManager::newOptionValue,Qt::QueuedConnection);
    }
    else
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Critical,"option engine null");
    connect(this,	&LanguagesManager::newLanguageLoaded,			PluginsManager::pluginsManager,&PluginsManager::newLanguageLoaded,Qt::QueuedConnection);
}

/// \brief Destroy the language manager
LanguagesManager::~LanguagesManager()
{
}

/// \brief load the language selected, return the main short code like en, fr, ..
std::string LanguagesManager::getTheRightLanguage() const
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    if(LanguagesAvailableList.size()==0)
    {
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"empty combobox list, failing back to english");
        return "en";
    }
    else
    {
        if(!stringtobool(OptionEngine::optionEngine->getOptionValue("Language","Language_force")))
        {
            ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"language auto-detection, QLocale::system().name(): "+QLocale::system().name().toStdString()+", QLocale::languageToString(QLocale::system().language()): "+QLocale::languageToString(QLocale::system().language()).toStdString());
            std::string tempLanguage=getMainShortName(QLocale::languageToString(QLocale::system().language()).toStdString());
            if(!tempLanguage.empty())
                return tempLanguage;
            else
            {
                tempLanguage=getMainShortName(QLocale::system().name().toStdString());
                if(!tempLanguage.empty())
                    return tempLanguage;
                else
                {
                    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"Autodetection of the language failed, QLocale::languageToString(QLocale::system().language()): "+QLocale::languageToString(QLocale::system().language()).toStdString()+", QLocale::system().name(): "+QLocale::system().name().toStdString()+", failing back to english");
                    return OptionEngine::optionEngine->getOptionValue("Language","Language");
                }
            }
        }
        else
            return OptionEngine::optionEngine->getOptionValue("Language","Language");
    }
}

/* \brief To set the current language
\param newLanguage Should be short name code found into informations.xml of language file */
void LanguagesManager::setCurrentLanguage(const std::string &newLanguage)
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start: "+newLanguage);
    //protection for re-set the same language
    if(currentLanguage==newLanguage)
        return;
    //store the language
    PluginsManager::pluginsManager->setLanguage(newLanguage);
    //unload the old language
    if(currentLanguage!="en")
    {
        unsigned int indexTranslator=0;
        while(indexTranslator<installedTranslator.size())
        {
            QCoreApplication::removeTranslator(installedTranslator.at(indexTranslator));
            delete installedTranslator.at(indexTranslator);
            indexTranslator++;
        }
        installedTranslator.clear();
    }
    unsigned int index=0;
    while(index<LanguagesAvailableList.size())
    {
        if(LanguagesAvailableList.at(index).mainShortName==newLanguage)
        {
            //load the new language
            if(newLanguage!="en")
            {
                QTranslator *temp;
                std::vector<std::string> fileToLoad;
                //load the language main
                if(newLanguage=="en")
                    fileToLoad.push_back(":/Languages/en/translation.qm");
                else
                    fileToLoad.push_back(LanguagesAvailableList.at(index).path+"translation.qm");
                //load the language plugin
                std::vector<PluginsAvailable> listLoadedPlugins=PluginsManager::pluginsManager->getPlugins();
                unsigned int indexPluginIndex=0;
                while(indexPluginIndex<listLoadedPlugins.size())
                {
                    if(listLoadedPlugins.at(indexPluginIndex).category!=PluginType_Languages)
                    {
                        std::string tempPath=listLoadedPlugins.at(indexPluginIndex).path+"Languages"+FacilityEngine::separator()+LanguagesAvailableList.at(index).mainShortName+FacilityEngine::separator()+"translation.qm";
                        if(QFile::exists(QString::fromStdString(tempPath)))
                            fileToLoad.push_back(tempPath);
                    }
                    indexPluginIndex++;
                }
                unsigned int indexTranslationFile=0;
                while(indexTranslationFile<fileToLoad.size())
                {
                    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"Translation to load: "+fileToLoad.at(indexTranslationFile));
                    temp=new QTranslator();
                    if(!temp->load(QString::fromStdString(fileToLoad.at(indexTranslationFile))) || temp->isEmpty())
                    {
                        delete temp;
                        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"Unable to load the translation file: "+fileToLoad.at(indexTranslationFile));
                    }
                    else
                    {
                        QCoreApplication::installTranslator(temp);
                        installedTranslator.push_back(temp);
                    }
                    indexTranslationFile++;
                }
                temp=new QTranslator();
                if(temp->load(QString("qt_")+QString::fromStdString(newLanguage), QLibraryInfo::location(QLibraryInfo::TranslationsPath)) && !temp->isEmpty())
                {
                    QCoreApplication::installTranslator(temp);
                    installedTranslator.push_back(temp);
                }
                else
                {
                    if(!temp->load(QString::fromStdString(LanguagesAvailableList.at(index).path)+"qt.qm") || temp->isEmpty())
                    {
                        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"Unable to load the translation file: qt.qm, into: "+LanguagesAvailableList.at(index).path);
                        delete temp;
                    }
                    else
                    {
                        QCoreApplication::installTranslator(temp);
                        installedTranslator.push_back(temp);
                    }
                }
            }
            currentLanguage=newLanguage;
            FacilityEngine::facilityEngine.retranslate();
            ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"emit newLanguageLoaded()");
            emit newLanguageLoaded(currentLanguage);
            return;
        }
        index++;
    }
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"unable to found language: "+newLanguage+", LanguagesAvailableList.size(): "+std::to_string(LanguagesAvailableList.size()));
}

/// \brief check if short name is found into language
std::string LanguagesManager::getMainShortName(const std::string &shortName) const
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    unsigned int index=0;
    while(index<LanguagesAvailableList.size())
    {
        const LanguagesAvailable &languagesAvailable=LanguagesAvailableList.at(index);
        if(languagesAvailable.shortName.find(shortName)!=languagesAvailable.shortName.cend() || languagesAvailable.fullName==shortName)
            return languagesAvailable.mainShortName;
        index++;
    }
    return "";
}

/// \brief load the language in languagePath
void LanguagesManager::allPluginIsLoaded()
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    setCurrentLanguage(getTheRightLanguage());
}

const std::string LanguagesManager::autodetectedLanguage() const
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"language auto-detection, QLocale::system().name(): "+QLocale::system().name().toStdString()+", QLocale::languageToString(QLocale::system().language()): "+QLocale::languageToString(QLocale::system().language()).toStdString());
    std::string tempLanguage=getMainShortName(QLocale::languageToString(QLocale::system().language()).toStdString());
    if(!tempLanguage.empty())
        return tempLanguage;
    else
    {
        tempLanguage=getMainShortName(QLocale::system().name().toStdString());
        if(!tempLanguage.empty())
            return tempLanguage;
    }
    return std::string();
}

void LanguagesManager::onePluginAdded(const PluginsAvailable &plugin)
{
    if(plugin.category!=PluginType_Languages)
        return;
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    QDomElement child = plugin.categorySpecific.firstChildElement(QStringLiteral("fullName"));
    LanguagesAvailable temp;
    if(!child.isNull() && child.isElement())
        temp.fullName=child.text().toStdString();
    child = plugin.categorySpecific.firstChildElement(QStringLiteral("shortName"));
    while(!child.isNull())
    {
        if(child.isElement())
        {
            if(child.hasAttribute("mainCode") && child.attribute(QStringLiteral("mainCode"))==QStringLiteral("true"))
                temp.mainShortName=child.text().toStdString();
            temp.shortName.insert(child.text().toStdString());
        }
        child = child.nextSiblingElement(QStringLiteral("shortName"));
    }
    temp.path=plugin.path;
    if(temp.fullName.empty())
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"fullName empty for: "+plugin.path);
    else if(temp.path.empty())
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"path empty for: "+plugin.path);
    else if(temp.mainShortName.empty())
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"mainShortName empty for: "+plugin.path);
    else if(temp.shortName.size()<=0)
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"temp.shortName.size()<=0 for: "+plugin.path);
    else if(!QFile::exists(QString::fromStdString(temp.path)+QStringLiteral("flag.png")))
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"flag file not found for: "+plugin.path);
    else if(!QFile::exists(QString::fromStdString(temp.path)+QStringLiteral("translation.qm")) && temp.mainShortName!="en")
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Warning,"translation not found for: "+plugin.path);
    else
        LanguagesAvailableList.push_back(temp);
    if(PluginsManager::pluginsManager->allPluginHaveBeenLoaded())
        setCurrentLanguage(getTheRightLanguage());
}

#ifndef ULTRACOPIER_PLUGIN_ALL_IN_ONE
void LanguagesManager::onePluginWillBeRemoved(const PluginsAvailable &plugin)
{
    ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"start");
    unsigned int index=0;
    while(index<LanguagesAvailableList.size())
    {
        if(plugin.path==LanguagesAvailableList.at(index).path)
        {
            return;
        }
        index++;
    }
}
#endif

void LanguagesManager::newOptionValue(const std::string &group)
{
    if(group=="Language")
    {
        ULTRACOPIER_DEBUGCONSOLE(Ultracopier::DebugLevel_Notice,"group: "+group);
        setCurrentLanguage(getTheRightLanguage());
    }
}