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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of the QtWebEngine module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 3 requirements
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** 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
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****************************************************************************/

#include "browser_accessibility_manager_qt.h"

#include "ui/accessibility/ax_enums.mojom.h"

#include "browser_accessibility_qt.h"
#include "render_widget_host_view_qt.h"

using namespace blink;

namespace content {

// static
BrowserAccessibilityManager *BrowserAccessibilityManager::Create(
        const ui::AXTreeUpdate &initialTree,
        BrowserAccessibilityDelegate *delegate)
{
#if QT_CONFIG(accessibility)
    Q_ASSERT(delegate);
    QObject *parent = nullptr;
    if (delegate->AccessibilityIsMainFrame()) {
        auto *access = static_cast<QtWebEngineCore::WebContentsAccessibilityQt *>(delegate->AccessibilityGetWebContentsAccessibility());
        parent = access ? access->accessibilityParentObject() : nullptr;
    }
    return new BrowserAccessibilityManagerQt(parent, initialTree, delegate);
#else
    return nullptr;
#endif // QT_CONFIG(accessibility)
}

// static
BrowserAccessibilityManager *BrowserAccessibilityManager::Create(
        BrowserAccessibilityDelegate *delegate)
{
#if QT_CONFIG(accessibility)
    return BrowserAccessibilityManager::Create(BrowserAccessibilityManagerQt::GetEmptyDocument(), delegate);
#else
    return nullptr;
#endif
}

#if QT_CONFIG(accessibility)
BrowserAccessibilityManagerQt::BrowserAccessibilityManagerQt(
    QObject *parentObject, const ui::AXTreeUpdate &initialTree,
    BrowserAccessibilityDelegate* delegate)
      : BrowserAccessibilityManager(delegate)
      , m_parentObject(parentObject)
{
    Initialize(initialTree);
    m_valid = true; // BrowserAccessibilityQt can start using the AXTree
}

BrowserAccessibilityManagerQt::~BrowserAccessibilityManagerQt()
{
    m_valid = false; // BrowserAccessibilityQt should stop using the AXTree
}

QAccessibleInterface *BrowserAccessibilityManagerQt::rootParentAccessible()
{
    return QAccessible::queryAccessibleInterface(m_parentObject);
}

void BrowserAccessibilityManagerQt::FireBlinkEvent(ax::mojom::Event event_type,
                                                   BrowserAccessibility* node)
{
    BrowserAccessibilityQt *iface = static_cast<BrowserAccessibilityQt*>(node);

    switch (event_type) {
    case ax::mojom::Event::kFocus: {
        QAccessibleEvent event(iface, QAccessible::Focus);
        QAccessible::updateAccessibility(&event);
        break;
    }
    case ax::mojom::Event::kCheckedStateChanged: {
        QAccessible::State change;
        change.checked = true;
        QAccessibleStateChangeEvent event(iface, change);
        QAccessible::updateAccessibility(&event);
        break;
    }
    case ax::mojom::Event::kValueChanged: {
        QVariant value;
        if (QAccessibleValueInterface *valueIface = iface->valueInterface())
            value = valueIface->currentValue();
        QAccessibleValueChangeEvent event(iface, value);
        QAccessible::updateAccessibility(&event);
        break;
    }
    case ax::mojom::Event::kChildrenChanged:
        break;
    case ax::mojom::Event::kLayoutComplete:
        break;
    case ax::mojom::Event::kLoadComplete:
        break;
    case ax::mojom::Event::kTextChanged: {
        QAccessibleTextUpdateEvent event(iface, -1, QString(), QString());
        QAccessible::updateAccessibility(&event);
        break;
    }
    case ax::mojom::Event::kTextSelectionChanged: {
        QAccessibleTextInterface *textIface = iface->textInterface();
        if (textIface) {
            int start = 0;
            int end = 0;
            textIface->selection(0, &start, &end);
            if (start == end) {
                QAccessibleTextCursorEvent event(iface, start);
                QAccessible::updateAccessibility(&event);
            } else {
                QAccessibleTextSelectionEvent event(iface, start, end);
                QAccessible::updateAccessibility(&event);
            }
        }
        break;
    }
    default:
        break;
    }
}

void BrowserAccessibilityManagerQt::FireGeneratedEvent(ui::AXEventGenerator::Event event_type,
                                                       BrowserAccessibility* node)
{
    BrowserAccessibilityQt *iface = static_cast<BrowserAccessibilityQt*>(node);

    switch (event_type) {
    case ui::AXEventGenerator::Event::VALUE_IN_TEXT_FIELD_CHANGED:
        if (iface->role() == QAccessible::EditableText) {
            QAccessibleTextUpdateEvent event(iface, -1, QString(), QString());
            QAccessible::updateAccessibility(&event);
        }
        break;
    default:
        break;
    }
}

#endif // QT_CONFIG(accessibility)

}