#include "mainwindow.h"
#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    _model = new QStandardItemModel(0,1,this);
     ui->treeView->setModel(_model);
     hideWidgets();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::readFile()
{
    _model->clear();
    QStandardItem *root = new QStandardItem("root:Root");
    _model->appendRow(root);

    QDomDocument document;

    //load file
    QFile file(_fileName);
    if(file.open(QIODevice::ReadOnly | QIODevice::Text))
    {
        document.setContent(&file);
        file.close();
    }

    //read xml file
    QDomElement xmlroot = document.firstChildElement();

    QDomNodeList Databases = xmlroot.elementsByTagName("Database");
    for (int i = 0; i < Databases.count(); ++i)
    {
        QDomElement database= Databases.at(i).toElement();
        _DBElementVector.append(database);
        _DBNameVector.append(database.attribute("name"));
        QStandardItem *databaseItem = new QStandardItem(QString("DB : %1").arg(database.attribute("name")));

        //read tables
        QDomNodeList tables = database.elementsByTagName("Table");
        for (int t = 0; t < tables.count(); ++t)
        {
            QDomElement table = tables.at(t).toElement();
            QStandardItem *tableItem = new QStandardItem(QString("TBL : %1").arg(table.attribute("name")));

            //read Field
//            QDomNodeList fields = table.elementsByTagName("Field");
//            for (int f = 0; f < fields.count(); ++f)
//            {
//                QDomElement field = fields.at(f).toElement();
//                QStandardItem *fieldItem = new QStandardItem(QString("FLD : %1").arg(field.attribute("name")));
////                            "Name: "+field.attribute("name") + "; Type: " + field.attribute("type") + "; Allow Null: " + field.attribute("null") + "; Is Forign key:" + field.attribute("isforeignkey"));

//                tableItem->appendRow(fieldItem);
//            }
            databaseItem->appendRow(tableItem);
        }
        root->appendRow(databaseItem);
    }
    _xmlDoc = document;
}

void MainWindow::on_actionOpen_triggered()
{
    _fileName = QFileDialog::getOpenFileName(this,
           tr("Open XML file"), "/home/",
           tr("Address XML (*.xml);;All Files (*)"));
    this->_xmlReader =new XMLReader(_fileName);
    readFile();
}


MainWindow::eElementType MainWindow::getElementType(QModelIndex indInput)
{
    auto dataSptd = indInput.data().toString().split(" : ");

    if(dataSptd.at(0) == "root")
        return MainWindow::eElementType::root;
    else if(dataSptd.at(0) == "DB")
        return MainWindow::eElementType::database;
    else if(dataSptd.at(0) == "TBL")
        return MainWindow::eElementType::table;
    else if(dataSptd.at(0) == "FLD")
        return MainWindow::eElementType::field;
    else
        return MainWindow::eElementType::unknown;
}

void MainWindow::on_treeView_doubleClicked(const QModelIndex &index)
{
    //hideWidgets();
    auto type = getElementType(index);
    switch (type)
    {
        case MainWindow::eElementType::root:
        {
            break;
        }
        case MainWindow::eElementType::database:
        {
            break;
        }
        case MainWindow::eElementType::table :
        {
            auto database = index.parent();
            _lastDBElement.clear();
           for (int i = 0; i < _xmlDoc.firstChild().childNodes().count(); ++i)
            {
                if(_xmlDoc.firstChild().childNodes().at(i).toElement().attribute("name") == database.data().toString().split(" : ").at(1))
                {
                    _lastDBElement = _xmlDoc.firstChild().childNodes().at(i).toElement();
                    break;
                }
            }
           _xmlReader->getDBTableList(_lastDBElement.attribute("name"));
           for (int i = 0; i < _lastDBElement.childNodes().count(); ++i)
           {
               auto tblItem = _lastDBElement.childNodes().at(i);
               auto elem = tblItem.toElement();
               if(elem.attribute("name") == index.data().toString().split(" : ").at(1))
               {
                   _fieldElemensVector.clear();
                   _lastTableElement = elem;
                  _fieldElemensVector =  _xmlReader->getFieldElements(elem.attribute("name"));
                  qDebug() << _fieldElemensVector.count();
                  qDebug() << elem.attribute("name");
                  qDebug() << _lastTableElement.attribute("name");
               }
           }
           ui->pushButton->setText("Create Init");
           ui->pushButton->show();
           break;
        }
    }


}

void MainWindow::on_pushButton_clicked()
{
    qDebug() << _lastTableElement.attribute("name");
    hideWidgets();
    if(_xmlInitDataDoc.isNull())
    {
        //create root element
        _rootInitData = _xmlInitDataDoc.createElement("Root");
        _xmlInitDataDoc.appendChild(_rootInitData);
    }
    if(! hasDatabaseChild(_rootInitData,_lastDBElement.attribute("name")))
    {
        //create database element
        _lastDBElementInitData = _xmlInitDataDoc.createElement("Database");
        _lastDBElementInitData.setAttribute("name",_lastDBElement.attribute("name"));
        _rootInitData.appendChild(_lastDBElementInitData);
    }
    else
    {
         auto dbs = _rootInitData.elementsByTagName("Database");
         for (int i = 0; i < dbs.count(); ++i)
         {
            if(dbs.at(i).toElement().attribute("name") == _lastDBElement.attribute("name"))
            {
                _lastDBElementInitData = dbs.at(i).toElement();
                break;
            }
         }
    }
    qDebug() << _lastTableElement.attribute("name");
    if(!hasTableChild(_lastDBElementInitData,_lastTableElement.attribute("name")))
    {
        _lastTableElementInitData = _xmlInitDataDoc.createElement("Table");
        qDebug()<<_lastTableElement.attribute("name");
        _lastTableElementInitData.setAttribute("name", _lastTableElement.attribute("name"));
        _lastDBElementInitData.appendChild(_lastTableElementInitData);
    }
    else
    {
        auto tbls = _lastDBElementInitData.elementsByTagName("Table");
        for (int i = 0; i < tbls.count(); ++i)
        {
           if(tbls.at(i).toElement().attribute("name") == _lastTableElement.attribute("name"))
           {
               _lastTableElementInitData = tbls.at(i).toElement();
               break;
           }
        }
    }
    _lastEntityElementInitData  = _xmlInitDataDoc.createElement("entity");
    _lastTableElementInitData.appendChild(_lastEntityElementInitData);
    _fieldIndex = 0;
    initUI();


}


void MainWindow::initUI()
{
    hideWidgets();
    ui->label_3->setText("put data into line Edit.");
    ui->label_3->show();
    auto fieldElement = _fieldElemensVector.at(_fieldIndex).toElement();
    ui->label_4->setText(fieldElement.attribute("name"));
    ui->label_4->show();
//    if(fieldElement.attribute("type").toLower().contains("varchar"))
//    {
//        ui->label_2->show();
//        ui->comboBox->itemData(0);
//        ui->comboBox->show();
//    }
    ui->lineEdit->clear();
    ui->lineEdit->show();
    ui->label->show();
    if(_fieldIndex < _fieldElemensVector.count()-1)
    {
        ui->pushButton_3->setText("Next Field");
        ui->pushButton_3->show();
    }
    else if(_fieldIndex == _fieldElemensVector.count() - 1)
    {
        ui->pushButton_3->setText("Done");
        ui->pushButton_3->show();
    }
}

bool MainWindow::hasDatabaseChild(QDomElement xmlRoot, QString DBName)
{
    auto dbs = xmlRoot.elementsByTagName("Database");
    for (int i = 0; i < dbs.count(); ++i)
    {
        if(dbs.at(i).toElement().attribute("name") == DBName)
            return true;
    }
    return false;
}
bool MainWindow::hasTableChild(QDomElement database, QString tableName)
{
    auto tbls = database.elementsByTagName("Table");
    for (int i = 0; i < tbls.count(); ++i)
    {
       if(tbls.at(i).toElement().attribute("name") == tableName)
           return true;
    }
    return false;
}
void MainWindow::hideWidgets()
{
    ui->label->hide();
    ui->label_2->hide();
//    ui->label_3->hide();
    ui->label_4->hide();
    ui->pushButton->hide();
    ui->pushButton_2->hide();
    ui->pushButton_3->hide();
    ui->lineEdit->hide();
    ui->comboBox->hide();
}

void MainWindow::on_pushButton_3_clicked()
{
    auto sourceField = _fieldElemensVector.at(_fieldIndex).toElement();
    _lastFieldElementInitData = _xmlInitDataDoc.createElement("Field");
    _lastFieldElementInitData.setAttribute("name", sourceField.attribute("name"));
    _lastFieldElementInitData.setAttribute("type", sourceField.attribute("type"));
    _lastFieldElementInitData.setAttribute("value",ui->lineEdit->text());
    _lastEntityElementInitData.appendChild(_lastFieldElementInitData);
    _fieldIndex++;
    if(_fieldIndex < _fieldElemensVector.count())
    {

        initUI();
    }
    else
    {
        hideWidgets();
    }
}


void MainWindow::writeFile()
{
    _fileName = QFileDialog::getSaveFileName(this);
    QFile savefile(_fileName);
    if(!savefile.open(QIODevice::WriteOnly | QIODevice::Text))
    {
        qDebug()<< "Ops! can not create file";
    }
    QTextStream stream(&savefile);
    stream<<_xmlInitDataDoc.toString();
    savefile.close();

}

void MainWindow::on_actionSave_triggered()
{
    writeFile();
}