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

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    MainWindow::executeTest();
}

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

void MainWindow::executeTest()
{
    QStandardItemModel *myModel = NULL;
    QList<QStandardItem *>columnItem;
    QList<QList<QStandardItem *>>QStandardItemList;
    QString item = NULL;
    QVariant qvData;
    int masterRowNumber = 0;
    int numberOfRows = 50000;
    int removeRows = 40000;
    int numCol = 15;
    int row = 0;
    int col = 0;

    myModel = new QStandardItemModel;

    //Get some data 50000 rows; each row has 15 columns of dummy data
    for(row = 0; row < numberOfRows; row++)
    {
        columnItem.clear();
        for(col = 0; col < numCol; col++)
        {
            columnItem.append(new QStandardItem);  //add columns to each row
            item = QString::number(row);
            columnItem[col]->setData(item, 0);
        }
        QStandardItemList.append(columnItem);
    }

    qDebug() << "creating first set of data";

    //Now that we have our data lets put into the model
    ui->treeView->setModel(myModel);
    ui->treeView->setUniformRowHeights(true);  //Speeds up scrolling
    ui->treeView->setSortingEnabled(true);  //enable sorting

    for(row = 0; row < QStandardItemList.size(); row++)
    {
        //Inserting data into the model
        for (col = 0; col < QStandardItemList[row].size(); col++)
               myModel->setItem(row, col, QStandardItemList[row][col]);

        masterRowNumber++;
    }

    qDebug() << "After first Insert into model";


    //sort the data - in the treeView
    ui->treeView->sortByColumn(2, Qt::AscendingOrder);

    //Now that our model is populated and shown in the treeView - lets delete rows
    // **** It takes forever to delete the first set of row after the sort.  If I use a QSortProxyModel it will delete the first set but then afterwards the long lag
    // comes back!
    //In 5.12 This is very SLOW!!! but fast in 5.11
    ui->treeView->setSortingEnabled(false);
    myModel->removeRows(0, removeRows, QModelIndex());  //remove 40000 rows
    ui->treeView->setSortingEnabled(true);
    masterRowNumber -= removeRows;

    qDebug() << "After first delete of rows now creating new set of data";


    QStandardItemList.clear();
    //Get some data 50000 rows; each row has 15 columns of dummy data
    for(row = 0; row < numberOfRows; row++)
    {
        columnItem.clear();
        for(col = 0; col < 1; col++)
        {
            columnItem.append(new QStandardItem);  //add columns to each row
            item = QString::number(row + col);  //any dummy data
            columnItem[col]->setData(item, 0);
        }
        QStandardItemList.append(columnItem);
    }

    qDebug() << "created second data completed";

    //now lets add more rows again
    for(row = 0; row < QStandardItemList.size(); row++)
    {
        //Inserting data into the model
        for (col = 0; col < QStandardItemList[row].size(); col++)
           myModel->setItem(masterRowNumber, col, QStandardItemList[row][col]);

        masterRowNumber++;
    }

    qDebug() << "After second insert into model";

    ui->treeView->setSortingEnabled(false);
    myModel->removeRows(0, removeRows, QModelIndex());  //remove 40000 rows
    ui->treeView->setSortingEnabled(true);
    masterRowNumber -= removeRows;

    qDebug() << "After second delete";


    qDebug() << "finished";

}