/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include <QtGui/qtguiglobal.h>
#if QT_CONFIG(accessibility)

#include "qwindowsuiaselectionprovider.h"
#include "qwindowsuiamainprovider.h"
#include "qwindowsuiautils.h"
#include "qwindowscontext.h"

#include <QtGui/qaccessible.h>
#include <QtCore/qloggingcategory.h>
#include <QtCore/qstring.h>
#include <QtCore/qlist.h>

QT_BEGIN_NAMESPACE

using namespace QWindowsUiAutomation;


QWindowsUiaSelectionProvider::QWindowsUiaSelectionProvider(QAccessible::Id id) :
    QWindowsUiaBaseProvider(id)
{
}

QWindowsUiaSelectionProvider::~QWindowsUiaSelectionProvider()
{
}

// Returns an array of providers with the selected items.
HRESULT STDMETHODCALLTYPE QWindowsUiaSelectionProvider::GetSelection(SAFEARRAY **pRetVal)
{
    qCDebug(lcQpaUiAutomation) << __FUNCTION__;

    if (!pRetVal)
        return E_INVALIDARG;
    *pRetVal = nullptr;

    QAccessibleInterface *accessible = accessibleInterface();
    if (!accessible)
        return UIA_E_ELEMENTNOTAVAILABLE;

    // First put selected items in a list, then build a safe array with the right size.
    QList<QAccessibleInterface *> selectedList;
    for (int i = 0; i < accessible->childCount(); ++i) {
        if (QAccessibleInterface *child = accessible->child(i)) {
            if (child->state().selected) {
                selectedList.append(child);
            }
        }
    }

    if ((*pRetVal = SafeArrayCreateVector(VT_UNKNOWN, 0, selectedList.size()))) {
        for (LONG i = 0; i < selectedList.size(); ++i) {
            if (QWindowsUiaMainProvider *childProvider = QWindowsUiaMainProvider::providerForAccessible(selectedList.at(i))) {
                SafeArrayPutElement(*pRetVal, &i, static_cast<IRawElementProviderSimple *>(childProvider));
                childProvider->Release();
            }
        }
    }
    return S_OK;
}

HRESULT STDMETHODCALLTYPE QWindowsUiaSelectionProvider::get_CanSelectMultiple(BOOL *pRetVal)
{
    qCDebug(lcQpaUiAutomation) << __FUNCTION__;

    if (!pRetVal)
        return E_INVALIDARG;
    *pRetVal = FALSE;

    QAccessibleInterface *accessible = accessibleInterface();
    if (!accessible)
        return UIA_E_ELEMENTNOTAVAILABLE;

    *pRetVal = accessible->state().multiSelectable;
    return S_OK;
}

HRESULT STDMETHODCALLTYPE QWindowsUiaSelectionProvider::get_IsSelectionRequired(BOOL *pRetVal)
{
    qCDebug(lcQpaUiAutomation) << __FUNCTION__;

    if (!pRetVal)
        return E_INVALIDARG;
    *pRetVal = FALSE;

    QAccessibleInterface *accessible = accessibleInterface();
    if (!accessible)
        return UIA_E_ELEMENTNOTAVAILABLE;

    // Initially returns false if none are selected. After the first selection, it may be required.
    bool anySelected = false;
    for (int i = 0; i < accessible->childCount(); ++i) {
        if (QAccessibleInterface *child = accessible->child(i)) {
            if (child->state().selected) {
                anySelected = true;
                break;
            }
        }
    }

    *pRetVal = anySelected && !accessible->state().multiSelectable && !accessible->state().extSelectable;
    return S_OK;
}

QT_END_NAMESPACE

#endif // QT_CONFIG(accessibility)