#include "XMLReader.h"

/*****************************************************************************/
/**
 * @brief Constructor
 * @details
 *
 * @return Nothing
 */
/*****************************************************************************/
XMLReader::XMLReader(QString xmlAddress)
{
    QFile xmlFile(xmlAddress);
    if(!xmlFile.open(QIODevice::ReadOnly))
    {
        //"XML file not find"
    }
    if (!_xmlDoc.setContent(&xmlFile))
    {
        // "Oops!!, The file is not a xml file."
    }
    xmlFile.close();
    getDatabaseNameList();
}



/*****************************************************************************/
/**
 * @brief Get a list of databases's Names
 * @details
 *
 * @return QVector<QString> DBNames
 */
/*****************************************************************************/
QVector<QString> XMLReader::getDatabaseNameList()
{
     _DBElementVector.clear();
    _root = _xmlDoc.firstChildElement();
    QDomNodeList DBs = _root.elementsByTagName("Database");
    for (int DBIndex = 0; DBIndex  < DBs.count(); ++DBIndex )
    {
        QDomElement DBElement = DBs.at(DBIndex).toElement();
        _DBNameVector.append(DBElement.attribute("name"));
        _DBElementVector.append(DBElement);
    }
    return _DBNameVector;
}

/*****************************************************************************/
/**
 * @brief Method to get a list of a database's tables
 * @details
 *
 * @return QVector<QString> tblNmaes
 */
/*****************************************************************************/
QVector<QString> XMLReader::getDBTableList(QString DBName)
{
    _tableNamevector.clear();
    bool wasDB = false;
    for (int i = 0; i < _DBElementVector.count(); ++i)
    {
        if(_DBElementVector.at(i).attribute("name") == DBName)
        {
            wasDB = true;
            if(!_DBElementVector.at(i).isElement())
            {
                QString logText =  "Oops!!, The xml file is incorrect. Error was at : " +
                    _DBElementVector.at(i).text();
                //Erorr logText
                break;

            }
            QDomNodeList  tblNodes =  _DBElementVector.at(i).elementsByTagName("Table");
            for (int tindex = 0; tindex < tblNodes.count(); ++tindex)
            {
                QDomElement tableElement = tblNodes.at(tindex).toElement();
                _tableElementVector.append(tableElement);
                _tableNamevector.append(tableElement.attribute("name"));
            }
            break;
        }
    }
    if(!wasDB)
    {
        QString logText =  "Oops!!, The xml file does not have Database Tage by name : " +
            DBName;
        //Erorr logText
        return _tableNamevector ;
    }
    if( _tableNamevector.count() == 0)
    {
        QString logText =  "Oops!!, The " +
            DBName +
            "exist but does not have any table";
        //Erorr logText
        return _tableNamevector ;
    }

    return _tableNamevector ;
}


/*****************************************************************************/
/**
 * @brief Method to get a list of a database's tables
 * @details
 *
 * @return QVector<QString> tblNmaes
 */
/*****************************************************************************/
QVector<QString> XMLReader::getDBTableList(QDomElement DBElement)
{
    _tableNamevector.clear();
    QDomNodeList tblNodes = DBElement.elementsByTagName("Table");
    for (int tblIndex = 0; tblIndex < tblNodes.count(); ++tblIndex)
    {
        if(!tblNodes.at(tblIndex).isElement())
        {
            QString logText =  "Oops!!, The xml Database Tage by name : " +
                DBElement.attribute("name") +
                " is not xml element";
            //Error logText
            break;
        }
        QDomElement tableElement = tblNodes.at(tblIndex).toElement();
        _tableNamevector.append(tableElement.attribute("name"));
    }
    if( _tableNamevector.count() == 0)
    {
        QString logText =  "Oops!!, The " +
             DBElement.attribute("name") +
            "exist but does not have any table";
        //Error logText

    }
    return _tableNamevector;
}
QVector<QDomElement> XMLReader::getLastFieldElements()
{
    return _fieldElementVector;
}

QVector<QDomElement> XMLReader::getFieldElements(QDomElement tableElement)
{
    _fieldElementVector.clear();
    QDomNodeList fieldNodes = tableElement.elementsByTagName("Field");
    if(fieldNodes .count() > 0)
    {
        for(int i = 0; i < fieldNodes.count();  i++)
        {
            _fieldElementVector.append(fieldNodes.at(i).toElement());
        }
    }
    else
    {
        //Error there is no Field.
    }
    return _fieldElementVector;
}
QVector<QDomElement> XMLReader::getFieldElements(QString tableName)
{
    _fieldElementVector.clear();
    if(_tableElementVector.count() > 0)
    {
        for(int j = 0; j < _tableElementVector.count(); j++)
        {
            if(_tableElementVector.at(j).attribute("name") == tableName)
            {
                QDomNodeList fieldNodes = _tableElementVector.at(j).elementsByTagName("Field");
                if(fieldNodes .count() > 0)
                {
                    for(int i = 0; i < fieldNodes.count();  i++)
                    {
                        _fieldElementVector.append(fieldNodes.at(i).toElement());
                    }
                }
                else
                {
                    //Error there is no Field.
                }
                break;
            }
        }
    }
    return _fieldElementVector;
}