/*

 * Copyright (C) 2006 Apple Computer, 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 "IconLoader.h"

#include "Document.h"

#include "Frame.h"

#include "FrameLoader.h"

#include "FrameLoaderClient.h"

#include "IconDatabase.h"

#include "Logging.h"

#include "ResourceHandle.h"

#include "ResourceResponse.h"

#include "ResourceRequest.h"

#include "SubresourceLoader.h"

using namespace std;

namespace WebCore {

IconLoader::IconLoader(Frame* frame)

    : m_frame(frame)

    , m_loadIsInProgress(false)

{

}

auto_ptr<IconLoader> IconLoader::create(Frame* frame)

{

    return auto_ptr<IconLoader>(new IconLoader(frame));

}

IconLoader::~IconLoader()

{

}

void IconLoader::startLoading()

{    

    if (m_resourceLoader)

        return;

    // FIXME: http://bugs.webkit.org/show_bug.cgi?id=10902

    // Once ResourceHandle will load without a DocLoader, we can remove this check.

    // A frame may be documentless - one example is a frame containing only a PDF.

    if (!m_frame->document()) {

        LOG(IconDatabase, "Documentless-frame - icon won't be loaded");

        return;

    }

    // Set flag so we can detect the case where the load completes before

    // SubresourceLoader::create returns.

    m_loadIsInProgress = true;

    RefPtr<SubresourceLoader> loader = SubresourceLoader::create(m_frame, this, m_frame->loader()->iconURL());

    if (!loader)

        LOG_ERROR("Failed to start load for icon at url %s", m_frame->loader()->iconURL().url().ascii());

    // Store the handle so we can cancel the load if stopLoading is called later.

    // But only do it if the load hasn't already completed.

    if (m_loadIsInProgress)

        m_resourceLoader = loader.release();

}

void IconLoader::stopLoading()

{

    clearLoadingState();

}

void IconLoader::didReceiveResponse(SubresourceLoader* resourceLoader, const ResourceResponse& response)

{

    // If we got a status code indicating an invalid response, then lets

    // ignore the data and not try to decode the error page as an icon.

    int status = response.httpStatusCode();

    LOG(IconDatabase, "IconLoader::didReceiveResponse() - Loader %p, response %i", resourceLoader, status);

    if (status && (status < 200 || status > 299)) {

        ResourceHandle* handle = resourceLoader->handle();

        finishLoading(handle ? handle->request().url() : KURL(), 0);

    }

}

void IconLoader::didReceiveData(SubresourceLoader* loader, const char*, int size)

{

    LOG(IconDatabase, "IconLoader::didReceiveData() - Loader %p, number of bytes %i", loader, size);

}

void IconLoader::didFail(SubresourceLoader* resourceLoader, const ResourceError&)

{

    LOG(IconDatabase, "IconLoader::didFail() - Loader %p", resourceLoader);

    // Until <rdar://problem/5463392> is resolved and we can properly cancel SubresourceLoaders when they get an error response,

    // we need to be prepared to receive this call even after we've "finished loading" once.

    // After it is resolved, we can restore an assertion that the load is in progress if ::didFail() is called

    if (m_loadIsInProgress) {

        ASSERT(resourceLoader == m_resourceLoader);

        ResourceHandle* handle = resourceLoader->handle();

        finishLoading(handle ? handle->request().url() : KURL(), 0);

    }

}

void IconLoader::didFinishLoading(SubresourceLoader* resourceLoader)

{

    LOG(IconDatabase, "IconLoader::didFinishLoading() - Loader %p", resourceLoader);

    // Until <rdar://problem/5463392> is resolved and we can properly cancel SubresourceLoaders when they get an error response,

    // we need to be prepared to receive this call even after we've "finished loading" once.

    // After it is resolved, we can restore an assertion that the load is in progress if ::didFail() is called

    if (m_loadIsInProgress) {

        ASSERT(resourceLoader == m_resourceLoader);

        ResourceHandle* handle = resourceLoader->handle();

        finishLoading(handle ? handle->request().url() : KURL(), m_resourceLoader->resourceData());

    }

}

void IconLoader::finishLoading(const KURL& iconURL, PassRefPtr<SharedBuffer> data)

{

    // When an icon load results in a 404 we commit it to the database here and clear the loading state.  

    // But the SubresourceLoader continues pulling in data in the background for the 404 page if the server sends one.  

    // Once that data finishes loading or if the load is cancelled while that data is being read, finishLoading ends up being called a second time.

    // We need to change SubresourceLoader to have a mode where it will stop itself after receiving a 404 so this won't happen -

    // in the meantime, we'll only commit this data to the IconDatabase if it's the first time ::finishLoading() is called

    // <rdar://problem/5463392> tracks that enhancement

    if (!iconURL.isEmpty() && m_loadIsInProgress) {

        iconDatabase()->setIconDataForIconURL(data, iconURL.url());

        LOG(IconDatabase, "IconLoader::finishLoading() - Committing iconURL %s to database", iconURL.url().ascii());

        m_frame->loader()->commitIconURLToIconDatabase(iconURL);

        m_frame->loader()->client()->dispatchDidReceiveIcon();

    }

    clearLoadingState();

}

void IconLoader::clearLoadingState()

{

    m_resourceLoader = 0;

    m_loadIsInProgress = false;

}

}