// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <QtTest/QTest>
#include <QtTest/QSignalSpy>
#include <QtQuickTest/quicktest.h>

#include <QtQuick/qquickview.h>
#include <QtQuick/private/qquicktreeview_p.h>
#include <QtQuick/private/qquicktreeview_p_p.h>

#include <QtQuickTemplates2/private/qquicktreeviewdelegate_p.h>

#include <QtQml/qqmlengine.h>
#include <QtQml/qqmlcontext.h>

#include "testmodel.h"

#include <QtQuickTestUtils/private/qmlutils_p.h>
#include <QtQuickTestUtils/private/viewtestutils_p.h>
#include <QtQuickTestUtils/private/visualtestutils_p.h>

using namespace QQuickViewTestUtils;
using namespace QQuickVisualTestUtils;

#define LOAD_TREEVIEW(fileName) \
    view->setSource(testFileUrl(fileName)); \
    view->show(); \
    QVERIFY(QTest::qWaitForWindowActive(view.get())); \
    auto treeView = view->rootObject()->property("treeView").value<QQuickTreeView *>(); \
    QVERIFY(treeView); \
    auto treeViewPrivate = QQuickTreeViewPrivate::get(treeView); \
    Q_UNUSED(treeViewPrivate) \
    auto model = treeView->model().value<TestModel *>(); \
    Q_UNUSED(model)

#define WAIT_UNTIL_POLISHED_ARG(item) \
    QVERIFY(QQuickTest::qWaitForPolish(item))
#define WAIT_UNTIL_POLISHED WAIT_UNTIL_POLISHED_ARG(treeView)

// ########################################################

class tst_qquicktreeviewdelegate : public QQmlDataTest
{
    Q_OBJECT
public:
    tst_qquicktreeviewdelegate();

private:
    std::unique_ptr<QQuickView> view = nullptr;

private slots:
    void initTestCase() override;
    void showTreeView();
    void expandAndCollapsUsingDoubleClick();
    void expandAndCollapseClickOnIndicator_data();
    void expandAndCollapseClickOnIndicator();
    void pointerNavigationDisabled();
    void checkPropertiesRoot();
    void checkPropertiesChildren();
    void checkCurrentIndex();
    void checkClickedSignal_data();
    void checkClickedSignal();
    void clearSelectionOnClick();
    void dragToSelect();
    void pressAndHoldToSelect();
};

tst_qquicktreeviewdelegate::tst_qquicktreeviewdelegate()
    : QQmlDataTest(QT_QMLTEST_DATADIR)
{
}

void tst_qquicktreeviewdelegate::initTestCase()
{
    QQmlDataTest::initTestCase();
    qmlRegisterType<TestModel>("TestModel", 1, 0, "TestModel");
    view.reset(createView());
}

void tst_qquicktreeviewdelegate::showTreeView()
{
    LOAD_TREEVIEW("unmodified.qml");
    // Check that the view is showing the root of the tree
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);
}

void tst_qquicktreeviewdelegate::expandAndCollapsUsingDoubleClick()
{
    LOAD_TREEVIEW("unmodified.qml");
    // Check that the view only has one row loaded so far (the root of the tree)
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);

    // Expand the root by double clicking on the row
    const auto item = treeView->itemAtIndex(treeView->index(0, 0));
    QVERIFY(item);
    const QPoint localPos = QPoint(item->width() / 2, item->height() / 2);
    const QPoint pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseDClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);

    WAIT_UNTIL_POLISHED;
    // We now expect 5 rows, the root pluss it's 4 children
    QCOMPARE(treeViewPrivate->loadedRows.count(), 5);

    // Collapse the root again
    QTest::mouseDClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);

    WAIT_UNTIL_POLISHED;
    // Check that the view only has one row loaded again (the root of the tree)
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);
}

void tst_qquicktreeviewdelegate::expandAndCollapseClickOnIndicator_data()
{
    QTest::addColumn<bool>("interactive");
    QTest::newRow("interactive") << true;
    QTest::newRow("not interactive") << false;
}

void tst_qquicktreeviewdelegate::expandAndCollapseClickOnIndicator()
{
    QFETCH(bool, interactive);

    LOAD_TREEVIEW("unmodified.qml");

    treeView->setInteractive(interactive);

    // Check that the view only has one row loaded so far (the root of the tree)
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);

    // Expand the root by clicking on the indicator
    const auto item = qobject_cast<QQuickTreeViewDelegate *>(treeView->itemAtIndex(treeView->index(0, 0)));
    QVERIFY(item);
    const auto indicator = item->indicator();
    const QPoint localPos = QPoint(indicator->width() / 2, indicator->height() / 2);
    const QPoint pos = item->window()->contentItem()->mapFromItem(indicator, localPos).toPoint();

    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);

    WAIT_UNTIL_POLISHED;
    // We now expect 5 rows, the root pluss it's 4 children
    QCOMPARE(treeViewPrivate->loadedRows.count(), 5);

    // Collapse the root again
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);

    WAIT_UNTIL_POLISHED;
    // Check that the view only has one row loaded again (the root of the tree)
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);
}

void tst_qquicktreeviewdelegate::pointerNavigationDisabled()
{
    // Check that treeview respects TableView.pointerNavigationEnabled.
    // When set to false, TreeView should not handle any pointer navigation events.
    LOAD_TREEVIEW("unmodified.qml");
    treeView->setPointerNavigationEnabled(false);

    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);
    QVERIFY(!treeView->isExpanded(0));

    // Try to expand the root by clicking on the indicator
    const auto item = qobject_cast<QQuickTreeViewDelegate *>(treeView->itemAtIndex(treeView->index(0, 0)));
    QVERIFY(item);
    const auto indicator = item->indicator();
    QPoint localPos = QPoint(indicator->width() / 2, indicator->height() / 2);
    QPoint pos = item->window()->contentItem()->mapFromItem(indicator, localPos).toPoint();
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    // The tree should still be collapsed
    QVERIFY(!treeView->isExpanded(0));
    QVERIFY(!QQuickTest::qIsPolishScheduled(item));

    // Try a double click
    localPos = QPoint(item->width() / 2, item->height() / 2);
    pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseDClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    QVERIFY(!treeView->isExpanded(0));
    QVERIFY(!QQuickTest::qIsPolishScheduled(item));
}

void tst_qquicktreeviewdelegate::checkPropertiesRoot()
{
    LOAD_TREEVIEW("unmodified.qml");
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);

    const auto rootFxItem = treeViewPrivate->loadedTableItem(QPoint(0, 0));
    QVERIFY(rootFxItem);
    const auto rootItem = qobject_cast<QQuickTreeViewDelegate *>(rootFxItem->item);
    QVERIFY(rootItem);

    QCOMPARE(rootItem->treeView(), treeView);
    QCOMPARE(rootItem->isTreeNode(), true);
    QCOMPARE(rootItem->expanded(), false);
    QCOMPARE(rootItem->hasChildren(), true);
    QCOMPARE(rootItem->depth(), 0);
    QCOMPARE(rootItem->leftPadding(), rootItem->leftMargin() + (rootItem->depth() * rootItem->indentation()) + rootItem->indicator()->width() + rootItem->spacing());
    QCOMPARE(rootItem->indicator()->x(), rootItem->leftMargin() + (rootItem->depth() * rootItem->indentation()));

    treeView->expand(0);
    WAIT_UNTIL_POLISHED;

    QCOMPARE(rootItem->expanded(), true);
}

void tst_qquicktreeviewdelegate::checkPropertiesChildren()
{
    LOAD_TREEVIEW("unmodified.qml");
    treeView->expand(0);
    WAIT_UNTIL_POLISHED;
    // We now expect 5 rows, the root pluss it's 4 children
    QCOMPARE(treeViewPrivate->loadedRows.count(), 5);

    // The last child has it's own children, so expand that one as well
    const auto rootIndex = model->index(0, 0);
    const int childCount = model->rowCount(rootIndex);
    QCOMPARE(childCount, 4);
    const auto lastChildIndex = model->index(childCount - 1, 0, rootIndex);
    QVERIFY(lastChildIndex.isValid());
    QCOMPARE(model->hasChildren(lastChildIndex), true);

    treeView->expand(4);
    WAIT_UNTIL_POLISHED;
    // We now expect root + 4 children + 4 children = 9 rows
    const int rowCount = treeViewPrivate->loadedRows.count();
    QCOMPARE(rowCount, 9);

    // Go through all rows in the view, except the root
    for (int row = 1; row < rowCount; ++row) {
        const auto childFxItem = treeViewPrivate->loadedTableItem(QPoint(0, row));
        QVERIFY(childFxItem);
        const auto childItem = qobject_cast<QQuickTreeViewDelegate *>(childFxItem->item);
        QVERIFY(childItem);

        QCOMPARE(childItem->treeView(), treeView);
        QCOMPARE(childItem->isTreeNode(), true);
        QCOMPARE(childItem->expanded(), row == 4);
        QCOMPARE(childItem->hasChildren(), row == 4 || row == 8);
        QCOMPARE(childItem->depth(), row <= 4 ? 1 : 2);
        QCOMPARE(childItem->current(), false);
        QCOMPARE(childItem->selected(), false);
        QCOMPARE(childItem->editing(), false);
        QCOMPARE(childItem->leftPadding(), childItem->leftMargin() + (childItem->depth() * childItem->indentation()) + childItem->indicator()->width() + childItem->spacing());
        QCOMPARE(childItem->indicator()->x(), childItem->leftMargin() + (childItem->depth() * childItem->indentation()));
    }
}

void tst_qquicktreeviewdelegate::checkCurrentIndex()
{
    // Check that that a cell becomes current when you click on it
    LOAD_TREEVIEW("unmodified.qml");
    // Check that the view only has one row loaded so far (the root of the tree)
    QCOMPARE(treeViewPrivate->loadedRows.count(), 1);

    const QPoint cell(0, 0);
    const auto item = qobject_cast<QQuickTreeViewDelegate *>(treeView->itemAtCell(cell));
    QVERIFY(item);
    QVERIFY(!item->current());
    QVERIFY(!item->selected());
    QVERIFY(!item->editing());
    QVERIFY(!treeView->hasActiveFocus());

    // Click on the label
    QPoint localPos = QPoint(item->width() / 2, item->height() / 2);
    QPoint pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    QVERIFY(item->current());
    QVERIFY(!item->selected());
    QVERIFY(!item->editing());
    QVERIFY_ACTIVE_FOCUS(treeView);

    // Select the cell
    treeView->selectionModel()->setCurrentIndex(treeView->modelIndex(cell), QItemSelectionModel::Select);
    QVERIFY(item->current());
    QVERIFY(item->selected());
    QVERIFY(!item->editing());
}

void tst_qquicktreeviewdelegate::checkClickedSignal_data()
{
    QTest::addColumn<bool>("pointerNavigationEnabled");
    QTest::newRow("pointer navigation enabled") << true;
    QTest::newRow("pointer navigation disabled") << false;
}

void tst_qquicktreeviewdelegate::checkClickedSignal()
{
    // Check that the delegate emits clicked when clicking on the
    // label, but not when clicking on the indicator. This API is
    // a part of the AbstractButton API, and should work with or
    // without TableView.pointerNavigationEnabled set.
    QFETCH(bool, pointerNavigationEnabled);

    LOAD_TREEVIEW("unmodified.qml");
    treeView->setPointerNavigationEnabled(pointerNavigationEnabled);

    const auto item = treeView->itemAtIndex(treeView->index(0, 0));
    QVERIFY(item);

    QSignalSpy clickedSpy(item, SIGNAL(clicked()));

    // Click on the label
    QPoint localPos = QPoint(item->width() / 2, item->height() / 2);
    QPoint pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    QCOMPARE(clickedSpy.size(), 1);
    clickedSpy.clear();

    // Click on the indicator
    const auto indicator = item->property("indicator").value<QQuickItem *>();
    QVERIFY(indicator);
    localPos = QPoint(indicator->x() + indicator->width() / 2, indicator->y() + indicator->height() / 2);
    pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    QCOMPARE(clickedSpy.size(), 0);
}

void tst_qquicktreeviewdelegate::clearSelectionOnClick()
{
    LOAD_TREEVIEW("unmodified.qml");

    // Select root item
    const auto index = treeView->selectionModel()->model()->index(0, 0);
    treeView->selectionModel()->select(index, QItemSelectionModel::Select);
    QCOMPARE(treeView->selectionModel()->selectedIndexes().size(), 1);

    // Click on a cell. This should remove the selection
    const auto item = qobject_cast<QQuickTreeViewDelegate *>(treeView->itemAtIndex(treeView->index(0, 0)));
    QVERIFY(item);
    QPoint localPos = QPoint(item->width() / 2, item->height() / 2);
    QPoint pos = item->window()->contentItem()->mapFromItem(item, localPos).toPoint();
    QTest::mouseClick(item->window(), Qt::LeftButton, Qt::NoModifier, pos);
    QCOMPARE(treeView->selectionModel()->selectedIndexes().size(), 0);
}

void tst_qquicktreeviewdelegate::dragToSelect()
{
    // Check that the delegate is not blocking the user from
    // being able to select cells using Drag.
    LOAD_TREEVIEW("unmodified.qml");

    // When TreeView is not interactive, SelectionRectangle
    // will use Drag by default.
    treeView->setInteractive(false);
    treeView->expandRecursively();

    WAIT_UNTIL_POLISHED;

    QVERIFY(!treeView->selectionModel()->hasSelection());
    QCOMPARE(treeView->selectionBehavior(), QQuickTableView::SelectRows);

    // Drag on from cell 0,0 to 0,1
    const auto item0_0 = treeView->itemAtIndex(treeView->index(0, 0));
    const auto item0_1 = treeView->itemAtIndex(treeView->index(1, 0));
    QVERIFY(item0_0);
    QVERIFY(item0_1);

    QQuickWindow *window = treeView->window();
    QPoint localPos0_0 = QPoint(item0_0->width() / 2, item0_0->height() / 2);
    QPoint windowPos0_0 = window->contentItem()->mapFromItem(item0_0, localPos0_0).toPoint();
    QPoint localPos0_1 = QPoint(item0_1->width() / 2, item0_1->height() / 2);
    QPoint windowPos0_1 = window->contentItem()->mapFromItem(item0_1, localPos0_1).toPoint();

    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, windowPos0_0);
    QTest::mouseMove(window, windowPos0_1);
    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, windowPos0_1);

    // Since TreeView uses TableView.SelectRows by default, we
    // now expect cells from 0,0 and 1,1 to be selected.
    QCOMPARE(treeView->selectionModel()->selectedIndexes().size(), 4);
}

void tst_qquicktreeviewdelegate::pressAndHoldToSelect()
{
    // Check that the delegate is not blocking the user from
    // being able to select cells using PressAndHold
    LOAD_TREEVIEW("unmodified.qml");

    // When TreeView is interactive, SelectionRectangle
    // will use PressAndHold by default.
    treeView->setInteractive(true);
    treeView->expandRecursively();

    WAIT_UNTIL_POLISHED;

    QVERIFY(!treeView->selectionModel()->hasSelection());
    QCOMPARE(treeView->selectionBehavior(), QQuickTableView::SelectRows);

    // PressAndHold on cell 0,0
    const auto item0_0 = treeView->itemAtIndex(treeView->index(0, 0));
    QVERIFY(item0_0);

    QQuickWindow *window = treeView->window();
    QPoint localPos0_0 = QPoint(item0_0->width() / 2, item0_0->height() / 2);
    QPoint windowPos0_0 = window->contentItem()->mapFromItem(item0_0, localPos0_0).toPoint();

    QTest::mousePress(window, Qt::LeftButton, Qt::NoModifier, windowPos0_0);
    QTRY_VERIFY(treeView->selectionModel()->hasSelection());
    // Since TreeView uses TableView.SelectRows by default, we
    // now expect both cell 0,0 and 1,0 to be selected.
    QCOMPARE(treeView->selectionModel()->selectedIndexes().size(), 2);
    QTest::mouseRelease(window, Qt::LeftButton, Qt::NoModifier, windowPos0_0);
}

QTEST_MAIN(tst_qquicktreeviewdelegate)

#include "tst_qquicktreeviewdelegate.moc"