/*
 * 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:
 * 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 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 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.
 */

#ifndef ResourceLoadTiming_h
#define ResourceLoadTiming_h

#include "platform/PlatformExport.h"
#include "wtf/PassRefPtr.h"
#include "wtf/RefCounted.h"
#include "wtf/RefPtr.h"

namespace blink {

class PLATFORM_EXPORT ResourceLoadTiming
    : public RefCounted<ResourceLoadTiming> {
 public:
  static PassRefPtr<ResourceLoadTiming> create();

  PassRefPtr<ResourceLoadTiming> deepCopy();
  bool operator==(const ResourceLoadTiming&) const;
  bool operator!=(const ResourceLoadTiming&) const;

  void setDnsStart(double);
  void setRequestTime(double);
  void setProxyStart(double);
  void setProxyEnd(double);
  void setDnsEnd(double);
  void setConnectStart(double);
  void setConnectEnd(double);
  void setWorkerStart(double);
  void setWorkerReady(double);
  void setSendStart(double);
  void setSendEnd(double);
  void setReceiveHeadersEnd(double);
  void setSslStart(double);
  void setSslEnd(double);
  void setPushStart(double);
  void setPushEnd(double);

  double dnsStart() const { return m_dnsStart; }
  double requestTime() const { return m_requestTime; }
  double proxyStart() const { return m_proxyStart; }
  double proxyEnd() const { return m_proxyEnd; }
  double dnsEnd() const { return m_dnsEnd; }
  double connectStart() const { return m_connectStart; }
  double connectEnd() const { return m_connectEnd; }
  double workerStart() const { return m_workerStart; }
  double workerReady() const { return m_workerReady; }
  double sendStart() const { return m_sendStart; }
  double sendEnd() const { return m_sendEnd; }
  double receiveHeadersEnd() const { return m_receiveHeadersEnd; }
  double sslStart() const { return m_sslStart; }
  double sslEnd() const { return m_sslEnd; }
  double pushStart() const { return m_pushStart; }
  double pushEnd() const { return m_pushEnd; }

  double calculateMillisecondDelta(double) const;

 private:
  ResourceLoadTiming();

  // We want to present a unified timeline to Javascript. Using walltime is
  // problematic, because the clock may skew while resources load. To prevent
  // that skew, we record a single reference walltime when root document
  // navigation begins. All other times are recorded using
  // monotonicallyIncreasingTime(). When a time needs to be presented to
  // Javascript, we build a pseudo-walltime using the following equation
  // (m_requestTime as example):
  //   pseudo time = document wall reference +
  //                     (m_requestTime - document monotonic reference).

  // All monotonicallyIncreasingTime() in seconds
  double m_requestTime;
  double m_proxyStart;
  double m_proxyEnd;
  double m_dnsStart;
  double m_dnsEnd;
  double m_connectStart;
  double m_connectEnd;
  double m_workerStart;
  double m_workerReady;
  double m_sendStart;
  double m_sendEnd;
  double m_receiveHeadersEnd;
  double m_sslStart;
  double m_sslEnd;
  double m_pushStart;
  double m_pushEnd;
};

}  // namespace blink

#endif