/*
 * Copyright (C) 2009 Google Inc. All Rights Reserved.
 *           (C) 2008 Apple Inc.
 *
 * 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 GOOGLE 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 GOOGLE 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.
 */

#include "config.h"
#include "StorageAreaProxy.h"

#if ENABLE(DOM_STORAGE)

#include "DOMWindow.h"
#include "Document.h"
#include "EventNames.h"
#include "ExceptionCode.h"
#include "Frame.h"
#include "Page.h"
#include "PageGroup.h"
#include "SecurityOrigin.h"
#include "StorageAreaImpl.h"
#include "StorageEvent.h"

#include "WebFrameImpl.h"
#include "WebStorageArea.h"
#include "WebString.h"
#include "WebURL.h"

namespace WebCore {

StorageAreaProxy::StorageAreaProxy(WebKit::WebStorageArea* storageArea, StorageType storageType)
    : m_storageArea(storageArea)
    , m_storageType(storageType)
{
}

StorageAreaProxy::~StorageAreaProxy()
{
}

unsigned StorageAreaProxy::length() const
{
    return m_storageArea->length();
}

String StorageAreaProxy::key(unsigned index) const
{
    return m_storageArea->key(index);
}

String StorageAreaProxy::getItem(const String& key) const
{
    return m_storageArea->getItem(key);
}

String StorageAreaProxy::setItem(const String& key, const String& value, ExceptionCode& ec, Frame* frame)
{
    WebKit::WebStorageArea::Result result = WebKit::WebStorageArea::ResultOK;
    WebKit::WebString oldValue;
    WebKit::WebFrame* webFrame = WebKit::WebFrameImpl::fromFrame(frame);
    m_storageArea->setItem(key, value, frame->document()->url(), result, oldValue, webFrame);
    ec = (result == WebKit::WebStorageArea::ResultOK) ? 0 : QUOTA_EXCEEDED_ERR;
    String oldValueString = oldValue;
    if (oldValueString != value && result == WebKit::WebStorageArea::ResultOK)
        storageEvent(key, oldValue, value, m_storageType, frame->document()->securityOrigin(), frame);
    return oldValue;
}

String StorageAreaProxy::removeItem(const String& key, Frame* frame)
{
    WebKit::WebString oldValue;
    m_storageArea->removeItem(key, frame->document()->url(), oldValue);
    if (!oldValue.isNull())
        storageEvent(key, oldValue, String(), m_storageType, frame->document()->securityOrigin(), frame);
    return oldValue;
}

bool StorageAreaProxy::clear(Frame* frame)
{
    bool clearedSomething;
    m_storageArea->clear(frame->document()->url(), clearedSomething);
    if (clearedSomething)
        storageEvent(String(), String(), String(), m_storageType, frame->document()->securityOrigin(), frame);
    return clearedSomething;
}

bool StorageAreaProxy::contains(const String& key) const
{
    return !getItem(key).isNull();
}

// Copied from WebCore/storage/StorageEventDispatcher.cpp out of necessity.  It's probably best to keep it current.
void StorageAreaProxy::storageEvent(const String& key, const String& oldValue, const String& newValue, StorageType storageType, SecurityOrigin* securityOrigin, Frame* sourceFrame)
{
    Page* page = sourceFrame->page();
    if (!page)
        return;

    // We need to copy all relevant frames from every page to a vector since sending the event to one frame might mutate the frame tree
    // of any given page in the group or mutate the page group itself.
    Vector<RefPtr<Frame> > frames;
    if (storageType == SessionStorage) {
        // Send events only to our page.
        for (Frame* frame = page->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
            if (sourceFrame != frame && frame->document()->securityOrigin()->equal(securityOrigin))
                frames.append(frame);
        }

        for (unsigned i = 0; i < frames.size(); ++i) {
            ExceptionCode ec = 0;
            Storage* storage = frames[i]->domWindow()->sessionStorage(ec);
            if (!ec)
                frames[i]->document()->enqueueEvent(StorageEvent::create(eventNames().storageEvent, key, oldValue, newValue, sourceFrame->document()->url(), storage));
        }
    } else {
        // Send events to every page.
        const HashSet<Page*>& pages = page->group().pages();
        HashSet<Page*>::const_iterator end = pages.end();
        for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
            for (Frame* frame = (*it)->mainFrame(); frame; frame = frame->tree()->traverseNext()) {
                if (sourceFrame != frame && frame->document()->securityOrigin()->equal(securityOrigin))
                    frames.append(frame);
            }
        }

        for (unsigned i = 0; i < frames.size(); ++i) {
            ExceptionCode ec = 0;
            Storage* storage = frames[i]->domWindow()->localStorage(ec);
            if (!ec)
                frames[i]->document()->enqueueEvent(StorageEvent::create(eventNames().storageEvent, key, oldValue, newValue, sourceFrame->document()->url(), storage));
        }
    }
}

} // namespace WebCore

#endif // ENABLE(DOM_STORAGE)
