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#include <QtGui>

#include "mainwindow.h"

#include "treemodel.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    setupUi(this);

    QStringList headers;

    headers << tr("Title") << tr("Description");

    QFile file(":/default.txt");

    file.open(QIODevice::ReadOnly);

    TreeModel *model = new TreeModel(headers, file.readAll());

    file.close();

    view->setModel(model);

    for (int column = 0; column < model->columnCount(); ++column)

        view->resizeColumnToContents(column);

    connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

    connect(view->selectionModel(),

            SIGNAL(selectionChanged(const QItemSelection &,

                                    const QItemSelection &)),

            this, SLOT(updateActions()));

    connect(actionsMenu, SIGNAL(aboutToShow()), this, SLOT(updateActions()));

    connect(insertRowAction, SIGNAL(triggered()), this, SLOT(insertRow()));

    connect(insertColumnAction, SIGNAL(triggered()), this, SLOT(insertColumn()));

    connect(removeRowAction, SIGNAL(triggered()), this, SLOT(removeRow()));

    connect(removeColumnAction, SIGNAL(triggered()), this, SLOT(removeColumn()));

    connect(insertChildAction, SIGNAL(triggered()), this, SLOT(insertChild()));

    updateActions();

}

void MainWindow::insertChild()

{

    QModelIndex index = view->selectionModel()->currentIndex();

    QAbstractItemModel *model = view->model();

    if (model->columnCount(index) == 0) {

        if (!model->insertColumn(0, index))

            return;

    }

    if (!model->insertRow(0, index))

        return;

    for (int column = 0; column < model->columnCount(index); ++column) {

        QModelIndex child = model->index(0, column, index);

        model->setData(child, QVariant("[No data]"), Qt::EditRole);

        if (!model->headerData(column, Qt::Horizontal).isValid())

            model->setHeaderData(column, Qt::Horizontal, QVariant("[No header]"),

                                 Qt::EditRole);

    }

    view->selectionModel()->setCurrentIndex(model->index(0, 0, index),

                                            QItemSelectionModel::ClearAndSelect);

    updateActions();

}

bool MainWindow::insertColumn(const QModelIndex &parent)

{

    QAbstractItemModel *model = view->model();

    int column = view->selectionModel()->currentIndex().column();

    // Insert a column in the parent item.

    bool changed = model->insertColumn(column + 1, parent);

    if (changed)

        model->setHeaderData(column + 1, Qt::Horizontal, QVariant("[No header]"),

                             Qt::EditRole);

    updateActions();

    return changed;

}

void MainWindow::insertRow()

{

    QModelIndex index = view->selectionModel()->currentIndex();

    QAbstractItemModel *model = view->model();

    if (!model->insertRow(index.row()+1, index.parent()))

        return;

    updateActions();

    for (int column = 0; column < model->columnCount(index.parent()); ++column) {

        QModelIndex child = model->index(index.row()+1, column, index.parent());

        model->setData(child, QVariant("[No data]"), Qt::EditRole);

    }

}

bool MainWindow::removeColumn(const QModelIndex &parent)

{

    QAbstractItemModel *model = view->model();

    int column = view->selectionModel()->currentIndex().column();

    // Insert columns in each child of the parent item.

    bool changed = model->removeColumn(column, parent);

    if (!parent.isValid() && changed)

        updateActions();

    return changed;

}

void MainWindow::removeRow()

{

    QModelIndex index = view->selectionModel()->currentIndex();

    QAbstractItemModel *model = view->model();

    if (model->removeRow(index.row(), index.parent()))

        updateActions();

}

void MainWindow::updateActions()

{

    bool hasSelection = !view->selectionModel()->selection().isEmpty();

    removeRowAction->setEnabled(hasSelection);

    removeColumnAction->setEnabled(hasSelection);

    bool hasCurrent = view->selectionModel()->currentIndex().isValid();

    insertRowAction->setEnabled(hasCurrent);

    insertColumnAction->setEnabled(hasCurrent);

    if (hasCurrent) {

        view->closePersistentEditor(view->selectionModel()->currentIndex());

        int row = view->selectionModel()->currentIndex().row();

        int column = view->selectionModel()->currentIndex().column();

        if (view->selectionModel()->currentIndex().parent().isValid())

            statusBar()->showMessage(tr("Position: (%1,%2)").arg(row).arg(column));

        else

            statusBar()->showMessage(tr("Position: (%1,%2) in top level").arg(row).arg(column));

    }

}