/*

 * Copyright (C) 2009 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.

 *     * 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.

 *     * 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 "BackForwardListClientImpl.h"

#include "HistoryItem.h"

#include "WebViewClient.h"

#include "WebViewImpl.h"

using namespace WebCore;

namespace WebKit {

const char backForwardNavigationScheme[] = "chrome-back-forward";

BackForwardListClientImpl::BackForwardListClientImpl(WebViewImpl* webView)

    : m_webView(webView)

{

}

BackForwardListClientImpl::~BackForwardListClientImpl()

{

}

void BackForwardListClientImpl::setCurrentHistoryItem(HistoryItem* item)

{

    m_previousItem = m_currentItem;

    m_currentItem = item;

}

HistoryItem* BackForwardListClientImpl::previousHistoryItem() const

{

    return m_previousItem.get();

}

void BackForwardListClientImpl::addItem(PassRefPtr<HistoryItem> item)

{

    m_previousItem = m_currentItem;

    m_currentItem = item;

    // If WebCore adds a new HistoryItem, it means this is a new navigation (ie,

    // not a reload or back/forward).

    m_webView->observeNewNavigation();

    if (m_webView->client())

        m_webView->client()->didAddHistoryItem();

}

void BackForwardListClientImpl::goToItem(HistoryItem* item)

{

    m_previousItem = m_currentItem;

    m_currentItem = item;

    if (m_pendingHistoryItem == item)

        m_pendingHistoryItem = 0;

}

HistoryItem* BackForwardListClientImpl::currentItem()

{

    return m_currentItem.get();

}

HistoryItem* BackForwardListClientImpl::itemAtIndex(int index)

{

    if (!m_webView->client() || index > forwardListCount() || -index > backListCount())

        return 0;

    // Since we don't keep the entire back/forward list, we have no way to

    // properly implement this method.  We return a dummy entry instead that we

    // intercept in our FrameLoaderClient implementation in case WebCore asks

    // to navigate to this HistoryItem.

    // FIXME: We should change WebCore to handle history.{back,forward,go}

    // differently.  It should perhaps just ask the FrameLoaderClient to

    // perform those navigations.

    String url_string = String::format(

        "%s://go/%d", backForwardNavigationScheme, index);

    m_pendingHistoryItem =

        HistoryItem::create(url_string, String(), 0.0);

    return m_pendingHistoryItem.get();

}

int BackForwardListClientImpl::backListCount()

{

    if (!m_webView->client())

        return 0;

    return m_webView->client()->historyBackListCount();

}

int BackForwardListClientImpl::forwardListCount()

{

    if (!m_webView->client())

        return 0;

    return m_webView->client()->historyForwardListCount();

}

void BackForwardListClientImpl::close()

{

    m_currentItem = 0;

    m_previousItem = 0;

    m_pendingHistoryItem = 0;

}

} // namespace WebKit