/*
 * Copyright (C) 2012 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "PerformanceResourceTiming.h"

#if ENABLE(RESOURCE_TIMING)

#include "Document.h"
#include "DocumentLoadTiming.h"
#include "DocumentLoader.h"
#include "KURL.h"
#include "ResourceRequest.h"
#include "ResourceResponse.h"
#include "SecurityOrigin.h"
#include <wtf/Vector.h>

namespace WebCore {

PerformanceResourceTiming::PerformanceResourceTiming(const ResourceRequest& request, const ResourceResponse& response, double finishTime, Document* requestingDocument)
    : PerformanceEntry(request.url().string(), "resource", response.resourceLoadTiming()->requestTime, finishTime)
    , m_timing(response.resourceLoadTiming())
    , m_finishTime(finishTime)
    , m_requestingDocument(requestingDocument)
{
}

PerformanceResourceTiming::~PerformanceResourceTiming()
{
}

String PerformanceResourceTiming::initiatorType() const
{
    // FIXME: This should be decided by the resource type.
    return "other";
}

// FIXME: Need to enforce same-origin policy on these.

double PerformanceResourceTiming::redirectStart() const
{
    // FIXME: Need to track and report redirects for resources.
    return 0;
}

double PerformanceResourceTiming::redirectEnd() const
{
    return 0;
}

double PerformanceResourceTiming::fetchStart() const
{
    return monotonicTimeToDocumentMilliseconds(m_timing->requestTime);
}

double PerformanceResourceTiming::domainLookupStart() const
{
    if (m_timing->dnsStart < 0)
        return fetchStart();

    return resourceTimeToDocumentMilliseconds(m_timing->dnsStart);
}

double PerformanceResourceTiming::domainLookupEnd() const
{
    if (m_timing->dnsEnd < 0)
        return domainLookupStart();

    return resourceTimeToDocumentMilliseconds(m_timing->dnsEnd);
}

double PerformanceResourceTiming::connectStart() const
{
    if (m_timing->connectStart < 0) // Connection was reused.
        return domainLookupEnd();

    // connectStart includes any DNS time, so we may need to trim that off.
    int connectStart = m_timing->connectStart;
    if (m_timing->dnsEnd >= 0)
        connectStart = m_timing->dnsEnd;

    return resourceTimeToDocumentMilliseconds(connectStart);
}

double PerformanceResourceTiming::connectEnd() const
{
    if (m_timing->connectEnd < 0) // Connection was reused.
        return connectStart();

    return resourceTimeToDocumentMilliseconds(m_timing->connectEnd);
}

double PerformanceResourceTiming::secureConnectionStart() const
{
    if (m_timing->sslStart < 0) // Secure connection not negotiated.
        return 0;

    return resourceTimeToDocumentMilliseconds(m_timing->sslStart);
}

double PerformanceResourceTiming::requestStart() const
{
    return resourceTimeToDocumentMilliseconds(m_timing->sendStart);
}

double PerformanceResourceTiming::responseStart() const
{
    // FIXME: This number isn't exactly correct. See the notes in PerformanceTiming::responseStart().
    return resourceTimeToDocumentMilliseconds(m_timing->receiveHeadersEnd);
}

double PerformanceResourceTiming::responseEnd() const
{
    return monotonicTimeToDocumentMilliseconds(m_finishTime);
}

double PerformanceResourceTiming::monotonicTimeToDocumentMilliseconds(double seconds) const
{
    ASSERT(seconds >= 0.0);
    return m_requestingDocument->loader()->timing()->convertMonotonicTimeToDocumentTime(seconds) * 1000.0;
}

double PerformanceResourceTiming::resourceTimeToDocumentMilliseconds(int deltaMilliseconds) const
{
    return monotonicTimeToDocumentMilliseconds(m_timing->requestTime) + deltaMilliseconds;
}

} // namespace WebCore

#endif // ENABLE(RESOURCE_TIMING)