/*
 * Copyright (C) 2010 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 "InspectorUtilities.h"

#include "Cache.h"
#include "CachedResource.h"
#include "CachedResourceLoader.h"
#include "Document.h"
#include "DocumentLoader.h"
#include "Frame.h"
#include "FrameLoader.h"
#include "KURL.h"
#include "SharedBuffer.h"
#include "TextEncoding.h"

#include <wtf/RefPtr.h>

#if ENABLE(INSPECTOR)

namespace WebCore {

// static
bool InspectorUtilities::resourceContentForURL(const KURL& url, Document* frameDocument, String* result)
{
    if (!frameDocument)
        return false;

    String textEncodingName;
    RefPtr<SharedBuffer> buffer;
    if (equalIgnoringFragmentIdentifier(url, frameDocument->frame()->loader()->documentLoader()->requestURL())) {
        textEncodingName = frameDocument->inputEncoding();
        buffer = frameDocument->frame()->loader()->provisionalDocumentLoader()->mainResourceData();
    } else {
        const String& urlString = url.string();
        CachedResource* cachedResource = frameDocument->cachedResourceLoader()->cachedResource(urlString);
        if (!cachedResource)
            cachedResource = cache()->resourceForURL(urlString);

        ASSERT(cachedResource); // FIXME(apavlov): This might be too aggressive.

        bool isUnpurgeable = true;
        if (cachedResource->isPurgeable()) {
            // If the resource is purgeable then make it unpurgeable to get
            // its data. This might fail, in which case we return an
            // empty String.
            if (!cachedResource->makePurgeable(false))
                isUnpurgeable = false;
        }
        if (isUnpurgeable) {
            textEncodingName = cachedResource->encoding();
            buffer = cachedResource->data();
        }
    }

    if (buffer) {
        TextEncoding encoding(textEncodingName);
        if (!encoding.isValid())
            encoding = WindowsLatin1Encoding();
        *result = encoding.decode(buffer->data(), buffer->size());
        return true;
    }

    return false;
}

} // namespace WebCore

#endif // ENABLE(INSPECTOR)