/*
 * Copyright (C) 2003, 2004, 2005, 2006, 2008, 2012 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "config.h"
#import "AXObjectCache.h"

#if HAVE(ACCESSIBILITY)

#import "AccessibilityObject.h"
#import "RenderObject.h"
#import "WebAccessibilityObjectWrapperMac.h"
#import "WebCoreSystemInterface.h"

#import <wtf/PassRefPtr.h>

#ifndef NSAccessibilityLiveRegionChangedNotification
#define NSAccessibilityLiveRegionChangedNotification @"AXLiveRegionChanged"
#endif

// The simple Cocoa calls in this file don't throw exceptions.

namespace WebCore {

void AXObjectCache::detachWrapper(AccessibilityObject* obj)
{
    [obj->wrapper() detach];
    obj->setWrapper(0);
}

void AXObjectCache::attachWrapper(AccessibilityObject* obj)
{
    RetainPtr<WebAccessibilityObjectWrapper> wrapper = adoptNS([[WebAccessibilityObjectWrapper alloc] initWithAccessibilityObject:obj]);
    obj->setWrapper(wrapper.get());
}

void AXObjectCache::postPlatformNotification(AccessibilityObject* obj, AXNotification notification)
{
    if (!obj)
        return;
    
    // Some notifications are unique to Safari and do not have NSAccessibility equivalents.
    NSString *macNotification;
    switch (notification) {
        case AXActiveDescendantChanged:
            // An active descendant change for trees means a selected rows change.
            if (obj->isTree())
                macNotification = NSAccessibilitySelectedRowsChangedNotification;
            
            // When a combobox uses active descendant, it means the selected item in its associated
            // list has changed. In these cases we should use selected children changed, because
            // we don't want the focus to change away from the combobox where the user is typing.
            else if (obj->isComboBox())
                macNotification = NSAccessibilitySelectedChildrenChangedNotification;
            else
                macNotification = NSAccessibilityFocusedUIElementChangedNotification;                
            break;
        case AXAutocorrectionOccured:
            macNotification = @"AXAutocorrectionOccurred";
            break;
        case AXFocusedUIElementChanged:
            macNotification = NSAccessibilityFocusedUIElementChangedNotification;
            break;
        case AXLayoutComplete:
            macNotification = @"AXLayoutComplete";
            break;
        case AXLoadComplete:
            macNotification = @"AXLoadComplete";
            break;
        case AXInvalidStatusChanged:
            macNotification = @"AXInvalidStatusChanged";
            break;
        case AXSelectedChildrenChanged:
            if (obj->isAccessibilityTable())
                macNotification = NSAccessibilitySelectedRowsChangedNotification;
            else
                macNotification = NSAccessibilitySelectedChildrenChangedNotification;
            break;
        case AXSelectedTextChanged:
            macNotification = NSAccessibilitySelectedTextChangedNotification;
            break;
        case AXValueChanged:
            macNotification = NSAccessibilityValueChangedNotification;
            break;
        case AXLiveRegionChanged:
            macNotification = NSAccessibilityLiveRegionChangedNotification;
            break;
        case AXRowCountChanged:
            macNotification = NSAccessibilityRowCountChangedNotification;
            break;
        case AXRowExpanded:
            macNotification = NSAccessibilityRowExpandedNotification;
            break;
        case AXRowCollapsed:
            macNotification = NSAccessibilityRowCollapsedNotification;
            break;
            // Does not exist on Mac.
        case AXCheckedStateChanged:
        default:
            return;
    }
    
    // NSAccessibilityPostNotification will call this method, (but not when running DRT), so ASSERT here to make sure it does not crash.
    // https://bugs.webkit.org/show_bug.cgi?id=46662
    ASSERT([obj->wrapper() accessibilityIsIgnored] || true);
    
    NSAccessibilityPostNotification(obj->wrapper(), macNotification);
    
    // Used by DRT to know when notifications are posted.
    [obj->wrapper() accessibilityPostedNotification:macNotification];
}

void AXObjectCache::nodeTextChangePlatformNotification(AccessibilityObject*, AXTextChange, unsigned, const String&)
{
}

void AXObjectCache::frameLoadingEventPlatformNotification(AccessibilityObject*, AXLoadingEvent)
{
}

void AXObjectCache::handleFocusedUIElementChanged(Node*, Node*)
{
    wkAccessibilityHandleFocusChanged();
}

void AXObjectCache::handleScrolledToAnchor(const Node*)
{
}

}

#endif // HAVE(ACCESSIBILITY)