/*

 * Copyright (C) 2006, 2007 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. 

 */

#include "config.h"

#include "WebKitDLL.h"

#include "WebBackForwardList.h"

#include "COMPtr.h"

#include "WebFrame.h"

#include "WebKit.h"

#include "WebPreferences.h"

#include <WebCore/BackForwardList.h>

#include <WebCore/HistoryItem.h>

using std::min;

using namespace WebCore;

// WebBackForwardList ----------------------------------------------------------------

static HashMap<BackForwardList*, WebBackForwardList*>& backForwardListWrappers()

{

    static HashMap<BackForwardList*, WebBackForwardList*> staticBackForwardListWrappers;

    return staticBackForwardListWrappers;

}

WebBackForwardList::WebBackForwardList(PassRefPtr<BackForwardList> backForwardList)

    : m_refCount(0)

    , m_backForwardList(backForwardList)

{

    ASSERT(!backForwardListWrappers().contains(m_backForwardList.get()));

    backForwardListWrappers().set(m_backForwardList.get(), this);

    gClassCount++;

}

WebBackForwardList::~WebBackForwardList()

{

    ASSERT(m_backForwardList->closed());

    ASSERT(backForwardListWrappers().contains(m_backForwardList.get()));

    backForwardListWrappers().remove(m_backForwardList.get());

    gClassCount--;

}

WebBackForwardList* WebBackForwardList::createInstance(PassRefPtr<BackForwardList> backForwardList)

{

    WebBackForwardList* instance;

    instance = backForwardListWrappers().get(backForwardList.get());

    if (!instance)

        instance = new WebBackForwardList(backForwardList);

    instance->AddRef();

    return instance;

}

// IUnknown -------------------------------------------------------------------

HRESULT STDMETHODCALLTYPE WebBackForwardList::QueryInterface(REFIID riid, void** ppvObject)

{

    *ppvObject = 0;

    if (IsEqualGUID(riid, IID_IUnknown))

        *ppvObject = static_cast<IWebBackForwardList*>(this);

    else if (IsEqualGUID(riid, IID_IWebBackForwardList))

        *ppvObject = static_cast<IWebBackForwardList*>(this);

    else if (IsEqualGUID(riid, IID_IWebBackForwardListPrivate))

        *ppvObject = static_cast<IWebBackForwardListPrivate*>(this);

    else

        return E_NOINTERFACE;

    AddRef();

    return S_OK;

}

ULONG STDMETHODCALLTYPE WebBackForwardList::AddRef(void)

{

    return ++m_refCount;

}

ULONG STDMETHODCALLTYPE WebBackForwardList::Release(void)

{

    ULONG newRef = --m_refCount;

    if (!newRef)

        delete(this);

    return newRef;

}

// IWebBackForwardList ---------------------------------------------------------

HRESULT STDMETHODCALLTYPE WebBackForwardList::addItem( 

    /* [in] */ IWebHistoryItem* item)

{

    COMPtr<WebHistoryItem> webHistoryItem;

    if (!item || FAILED(item->QueryInterface(CLSID_WebHistoryItem, (void**)&webHistoryItem)))

        return E_FAIL;

    m_backForwardList->addItem(webHistoryItem->historyItem());

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::goBack( void)

{

    m_backForwardList->goBack();

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::goForward( void)

{

    m_backForwardList->goForward();

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::goToItem( 

    /* [in] */ IWebHistoryItem* item)

{

    COMPtr<WebHistoryItem> webHistoryItem;

    if (!item || FAILED(item->QueryInterface(&webHistoryItem)))

        return E_FAIL;

    m_backForwardList->goToItem(webHistoryItem->historyItem());

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::backItem( 

    /* [retval][out] */ IWebHistoryItem** item)

{

    if (!item)

        return E_POINTER;

    HistoryItem* historyItem = m_backForwardList->backItem();

    if (!historyItem)

        return E_FAIL;

    *item = WebHistoryItem::createInstance(historyItem);

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::currentItem( 

    /* [retval][out] */ IWebHistoryItem** item)

{

    if (!item)

        return E_POINTER;

    HistoryItem* historyItem = m_backForwardList->currentItem();

    if (!historyItem)

        return E_FAIL;

    *item = WebHistoryItem::createInstance(historyItem);

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::forwardItem( 

    /* [retval][out] */ IWebHistoryItem** item)

{

    if (!item)

        return E_POINTER;

    HistoryItem* historyItem = m_backForwardList->forwardItem();

    if (!historyItem)

        return E_FAIL;

    *item = WebHistoryItem::createInstance(historyItem);

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::backListWithLimit( 

    /* [in] */ int limit,

    /* [out] */ int* listCount,

    /* [retval][out] */ IWebHistoryItem** list)

{

    HistoryItemVector historyItemVector;

    m_backForwardList->backListWithLimit(limit, historyItemVector);

    *listCount = static_cast<int>(historyItemVector.size());

    if (list)

        for (unsigned i = 0; i < historyItemVector.size(); i++)

            list[i] = WebHistoryItem::createInstance(historyItemVector[i].get());

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::forwardListWithLimit( 

    /* [in] */ int limit,

    /* [out] */ int* listCount,

    /* [retval][out] */ IWebHistoryItem** list)

{

    HistoryItemVector historyItemVector;

    m_backForwardList->forwardListWithLimit(limit, historyItemVector);

    *listCount = static_cast<int>(historyItemVector.size());

    if (list)

        for (unsigned i = 0; i < historyItemVector.size(); i++)

            list[i] = WebHistoryItem::createInstance(historyItemVector[i].get());

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::capacity( 

    /* [retval][out] */ int* result)

{

    *result = (int)m_backForwardList->capacity();

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::setCapacity( 

    /* [in] */ int size)

{

    if (size < 0)

        return E_FAIL;

    m_backForwardList->setCapacity(size);

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::backListCount( 

    /* [retval][out] */ int* count)

{

    *count = m_backForwardList->backListCount();

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::forwardListCount( 

    /* [retval][out] */ int* count)

{

    *count = m_backForwardList->forwardListCount();

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::containsItem( 

    /* [in] */ IWebHistoryItem* item,

    /* [retval][out] */ BOOL* result)

{

    COMPtr<WebHistoryItem> webHistoryItem;

    if (!item || FAILED(item->QueryInterface(&webHistoryItem)))

        return E_FAIL;

    *result = m_backForwardList->containsItem(webHistoryItem->historyItem());

    return S_OK;

}

HRESULT STDMETHODCALLTYPE WebBackForwardList::itemAtIndex( 

    /* [in] */ int index,

    /* [retval][out] */ IWebHistoryItem** item)

{

    if (!item)

        return E_POINTER;

    HistoryItem* historyItem = m_backForwardList->itemAtIndex(index);

    if (!historyItem)

        return E_FAIL;

    *item = WebHistoryItem::createInstance(historyItem);

    return S_OK;

}

// IWebBackForwardListPrivate --------------------------------------------------------

HRESULT STDMETHODCALLTYPE WebBackForwardList::removeItem( 

    /* [in] */ IWebHistoryItem* item)

{

    COMPtr<WebHistoryItem> webHistoryItem;

    if (!item || FAILED(item->QueryInterface(CLSID_WebHistoryItem, (void**)&webHistoryItem)))

        return E_FAIL;

    m_backForwardList->removeItem(webHistoryItem->historyItem());

    return S_OK;

}