/*
 * Copyright (C) 2011 Google 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER 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.
 */

#include "config.h"
#include "ShadowRoot.h"

#include "ElementTraversal.h"
#include "HistogramSupport.h"
#include "InsertionPoint.h"
#include "RuntimeEnabledFeatures.h"
#include "StyleResolver.h"
#include "markup.h"

namespace WebCore {

struct SameSizeAsShadowRoot : public DocumentFragment, public TreeScope {
    unsigned countersAndFlags[1];
    ContentDistributor distributor;
    void* host;
};

COMPILE_ASSERT(sizeof(ShadowRoot) == sizeof(SameSizeAsShadowRoot), shadowroot_should_stay_small);

enum ShadowRootUsageOriginType {
    ShadowRootUsageOriginWeb = 0,
    ShadowRootUsageOriginNotWeb,
    ShadowRootUsageOriginMax
};

ShadowRoot::ShadowRoot(Document& document, ShadowRootType type)
    : DocumentFragment(0, CreateShadowRoot)
    , TreeScope(this, &document)
    , m_applyAuthorStyles(false)
    , m_resetStyleInheritance(false)
    , m_type(type)
    , m_hostElement(0)
{
}

ShadowRoot::~ShadowRoot()
{
    // We cannot let ContainerNode destructor call willBeDeletedFrom()
    // for this ShadowRoot instance because TreeScope destructor
    // clears Node::m_treeScope thus ContainerNode is no longer able
    // to access it Document reference after that.
    willBeDeletedFrom(documentInternal());

    // We must remove all of our children first before the TreeScope destructor
    // runs so we don't go through TreeScopeAdopter for each child with a
    // destructed tree scope in each descendant.
    removeDetachedChildren();

    // We must call clearRareData() here since a ShadowRoot class inherits TreeScope
    // as well as Node. See a comment on TreeScope.h for the reason.
    if (hasRareData())
        clearRareData();
}

void ShadowRoot::dropChildren()
{
    removeDetachedChildren();
}

PassRefPtr<Node> ShadowRoot::cloneNode(bool, ExceptionCode& ec)
{
    ec = DATA_CLONE_ERR;
    return 0;
}

String ShadowRoot::innerHTML() const
{
    return createMarkup(*this, ChildrenOnly);
}

void ShadowRoot::setInnerHTML(const String& markup, ExceptionCode& ec)
{
    if (isOrphan()) {
        ec = INVALID_ACCESS_ERR;
        return;
    }

    if (RefPtr<DocumentFragment> fragment = createFragmentForInnerOuterHTML(markup, hostElement(), AllowScriptingContent, ec))
        replaceChildrenWithFragment(*this, fragment.release(), ec);
}

bool ShadowRoot::childTypeAllowed(NodeType type) const
{
    switch (type) {
    case ELEMENT_NODE:
    case PROCESSING_INSTRUCTION_NODE:
    case COMMENT_NODE:
    case TEXT_NODE:
    case CDATA_SECTION_NODE:
    case ENTITY_REFERENCE_NODE:
        return true;
    default:
        return false;
    }
}

void ShadowRoot::setApplyAuthorStyles(bool value)
{
    if (isOrphan())
        return;

    if (m_applyAuthorStyles != value) {
        m_applyAuthorStyles = value;
        hostElement()->setNeedsStyleRecalc();
    }
}

void ShadowRoot::setResetStyleInheritance(bool value)
{
    if (isOrphan())
        return;

    if (value != m_resetStyleInheritance) {
        m_resetStyleInheritance = value;
        if (attached() && hostElement())
            Style::resolveTree(*hostElement(), Style::Force);
    }
}

void ShadowRoot::childrenChanged(const ChildChange& change)
{
    if (isOrphan())
        return;

    ContainerNode::childrenChanged(change);
    invalidateDistribution();
}

void ShadowRoot::removeAllEventListeners()
{
    DocumentFragment::removeAllEventListeners();
    for (Node* node = firstChild(); node; node = NodeTraversal::next(node))
        node->removeAllEventListeners();
}

}
