/*

 * Copyright (C) 2006, 2007, 2008, 2010 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. 

 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

 *     its contributors may be used to endorse or promote products derived

 *     from this software without specific prior written permission. 

 *

 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "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 OR ITS 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 "WebElementDictionary.h"

#import "DOMNodeInternal.h"

#import "WebDOMOperations.h"

#import "WebFrame.h"

#import "WebFrameInternal.h"

#import "WebKitLogging.h"

#import "WebTypesInternal.h"

#import "WebView.h"

#import "WebViewPrivate.h"

#import <WebCore/Frame.h>

#import <WebCore/HitTestResult.h>

#import <WebCore/Image.h>

#import <WebCore/WebCoreObjCExtras.h>

#import <WebKit/DOMCore.h>

#import <WebKit/DOMExtensions.h>

#import <runtime/InitializeThreading.h>

#import <wtf/Threading.h>

using namespace WebCore;

static CFMutableDictionaryRef lookupTable = NULL;

static void addLookupKey(NSString *key, SEL selector)

{

    CFDictionaryAddValue(lookupTable, key, selector);

}

static void cacheValueForKey(const void *key, const void *value, void *self)

{

    // calling objectForKey will cache the value in our _cache dictionary

    [(WebElementDictionary *)self objectForKey:(NSString *)key];

}

@implementation WebElementDictionary

+ (void)initialize

{

    JSC::initializeThreading();

    WTF::initializeMainThreadToProcessMainThread();

#ifndef BUILDING_ON_TIGER

    WebCoreObjCFinalizeOnMainThread(self);

#endif

}

+ (void)initializeLookupTable

{

    if (lookupTable)

        return;

    lookupTable = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFCopyStringDictionaryKeyCallBacks, NULL);

    addLookupKey(WebElementDOMNodeKey, @selector(_domNode));

    addLookupKey(WebElementFrameKey, @selector(_webFrame));

    addLookupKey(WebElementImageAltStringKey, @selector(_altDisplayString));

    addLookupKey(WebElementImageKey, @selector(_image));

    addLookupKey(WebElementImageRectKey, @selector(_imageRect));

    addLookupKey(WebElementImageURLKey, @selector(_absoluteImageURL));

    addLookupKey(WebElementIsSelectedKey, @selector(_isSelected));

    addLookupKey(WebElementSpellingToolTipKey, @selector(_spellingToolTip));

    addLookupKey(WebElementTitleKey, @selector(_title));

    addLookupKey(WebElementLinkURLKey, @selector(_absoluteLinkURL));

    addLookupKey(WebElementLinkTargetFrameKey, @selector(_targetWebFrame));

    addLookupKey(WebElementLinkTitleKey, @selector(_titleDisplayString));

    addLookupKey(WebElementLinkLabelKey, @selector(_textContent));

    addLookupKey(WebElementLinkIsLiveKey, @selector(_isLiveLink));

    addLookupKey(WebElementIsContentEditableKey, @selector(_isContentEditable));

    addLookupKey(WebElementIsInScrollBarKey, @selector(_isInScrollBar));

}

- (id)initWithHitTestResult:(const HitTestResult&)result

{

    [[self class] initializeLookupTable];

    [super init];

    _result = new HitTestResult(result);

    return self;

}

- (void)dealloc

{

    if (WebCoreObjCScheduleDeallocateOnMainThread([WebElementDictionary class], self))

        return;

    delete _result;

    [_cache release];

    [_nilValues release];

    [super dealloc];

}

- (void)finalize

{

    ASSERT_MAIN_THREAD();

    delete _result;

    [super finalize];

}

- (void)_fillCache

{

    CFDictionaryApplyFunction(lookupTable, cacheValueForKey, self);

    _cacheComplete = YES;

}

- (NSUInteger)count

{

    if (!_cacheComplete)

        [self _fillCache];

    return [_cache count];

}

- (NSEnumerator *)keyEnumerator

{

    if (!_cacheComplete)

        [self _fillCache];

    return [_cache keyEnumerator];

}

- (id)objectForKey:(id)key

{

    id value = [_cache objectForKey:key];

    if (value || _cacheComplete || [_nilValues containsObject:key])

        return value;

    SEL selector = (SEL)CFDictionaryGetValue(lookupTable, key);

    if (!selector)

        return nil;

    value = [self performSelector:selector];

    unsigned lookupTableCount = CFDictionaryGetCount(lookupTable);

    if (value) {

        if (!_cache)

            _cache = [[NSMutableDictionary alloc] initWithCapacity:lookupTableCount];

        [_cache setObject:value forKey:key];

    } else {

        if (!_nilValues)

            _nilValues = [[NSMutableSet alloc] initWithCapacity:lookupTableCount];

        [_nilValues addObject:key];

    }

    _cacheComplete = ([_cache count] + [_nilValues count]) == lookupTableCount;

    return value;

}

- (DOMNode *)_domNode

{

    return kit(_result->innerNonSharedNode());

}

- (WebFrame *)_webFrame

{

    return [[[self _domNode] ownerDocument] webFrame];

}

// String's NSString* operator converts null Strings to empty NSStrings for compatibility

// with AppKit. We need to work around that here.

static NSString* NSStringOrNil(String coreString)

{

    if (coreString.isNull())

        return nil;

    return coreString;

}

- (NSString *)_altDisplayString

{

    return NSStringOrNil(_result->altDisplayString());

}

- (NSString *)_spellingToolTip

{

    TextDirection dir;

    return NSStringOrNil(_result->spellingToolTip(dir));

}

- (NSImage *)_image

{

    Image* image = _result->image();

    return image ? image->getNSImage() : nil;

}

- (NSValue *)_imageRect

{

    IntRect rect = _result->imageRect();

    return rect.isEmpty() ? nil : [NSValue valueWithRect:rect];

}

- (NSURL *)_absoluteImageURL

{

    return _result->absoluteImageURL();

}

- (NSNumber *)_isSelected

{

    return [NSNumber numberWithBool:_result->isSelected()];

}

- (NSString *)_title

{

    TextDirection dir;

    return NSStringOrNil(_result->title(dir));

}

- (NSURL *)_absoluteLinkURL

{

    return _result->absoluteLinkURL();

}

- (WebFrame *)_targetWebFrame

{

    return kit(_result->targetFrame());

}

- (NSString *)_titleDisplayString

{

    return NSStringOrNil(_result->titleDisplayString());

}

- (NSString *)_textContent

{

    return NSStringOrNil(_result->textContent());

}

- (NSNumber *)_isLiveLink

{

    return [NSNumber numberWithBool:_result->isLiveLink()];

}

- (NSNumber *)_isContentEditable

{

    return [NSNumber numberWithBool:_result->isContentEditable()];

}

- (NSNumber *)_isInScrollBar

{

    return [NSNumber numberWithBool:_result->scrollbar() != 0];

}

@end