// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_MEDIA_LOG_EVENTS_H_
#define MEDIA_BASE_MEDIA_LOG_EVENTS_H_

#include <string>
#include "media/base/media_export.h"
#include "media/base/media_log_type_enforcement.h"
#include "ui/gfx/geometry/size.h"

namespace media {

// Maximum length of urls that we can show.
constexpr size_t kMaxUrlLength = 1000;

// Events are changes in the state of a player, or a user interaction, or any
// other internal representation of a player at a given point in time.
// This list contains both events that are instant, such as play/pause, as
// well as events that span ranges of time, such as waiting for more data
// from the network, or decoding a video frame.
enum class MediaLogEvent {
  // The media player has started playing.
  kPlay,

  // The media player has entered a paused state.
  kPause,

  // The media player has _started_ a seek operation.
  kSeek,

  // The pipeline state has changed - see PipelineStatus in
  // media/base/pipeline_status.h
  kPipelineStateChange,

  // The media stack implementation of the blink media player has been created
  // but may not be fully initialized.
  kWebMediaPlayerCreated,

  // The media player has been destroyed and the log will soon die. No events
  // can come after receiving this one.
  kWebMediaPlayerDestroyed,

  // A web request has finished and the pipeline will start iminently.
  kLoad,

  // The video size has changed.
  // TODO(tmathmeyer) This is already a property, it might be useless to have it
  // be an event too. consider removing it.
  kVideoSizeChanged,

  // The runtime of the video was changed by the demuxer.
  kDurationChanged,

  // There is no more content to consume.
  kEnded,

  // There was a change to the buffering state of the video. This can be caused
  // by either network slowness or decoding slowness. See the comments in
  // media/base/buffering_state.h for more information.
  kBufferingStateChanged,

  // The player has been suspended to save resources.
  kSuspended,
};

// This has to be declared before the macros use it - Some infra code relies on
// the enum names to be UPPER_CASE, so this will convert them manually
// instead of using macro stringification.
MEDIA_EXPORT std::string MediaLogEventToString(MediaLogEvent level);

// Sometimes URLs can have encoded data that can be exteremly large.
MEDIA_EXPORT std::string TruncateUrlString(const std::string& url);

// These events can be triggered with no extra associated data.
MEDIA_LOG_EVENT_TYPELESS(kPlay);
MEDIA_LOG_EVENT_TYPELESS(kPause);
MEDIA_LOG_EVENT_TYPELESS(kWebMediaPlayerDestroyed);
MEDIA_LOG_EVENT_TYPELESS(kEnded);
MEDIA_LOG_EVENT_TYPELESS(kSuspended);
MEDIA_LOG_EVENT_TYPELESS(kWebMediaPlayerCreated);

// These events can be triggered with the extra data / names as defined here.
// Note that some events can be defined multiple times.
MEDIA_LOG_EVENT_NAMED_DATA(kSeek, double, "seek_target");
MEDIA_LOG_EVENT_NAMED_DATA(kVideoSizeChanged, gfx::Size, "dimensions");
MEDIA_LOG_EVENT_NAMED_DATA(kDurationChanged, base::TimeDelta, "duration");
MEDIA_LOG_EVENT_NAMED_DATA(kPipelineStateChange, std::string, "pipeline_state");
MEDIA_LOG_EVENT_NAMED_DATA_OP(kLoad, std::string, "url", TruncateUrlString);
MEDIA_LOG_EVENT_NAMED_DATA_OP(kWebMediaPlayerCreated,
                              std::string,
                              "origin_url",
                              TruncateUrlString);

// Each type of buffering state gets a different name.
MEDIA_LOG_EVENT_NAMED_DATA(
    kBufferingStateChanged,
    SerializableBufferingState<SerializableBufferingStateType::kVideo>,
    "video_buffering_state");
MEDIA_LOG_EVENT_NAMED_DATA(
    kBufferingStateChanged,
    SerializableBufferingState<SerializableBufferingStateType::kAudio>,
    "audio_buffering_state");
MEDIA_LOG_EVENT_NAMED_DATA(
    kBufferingStateChanged,
    SerializableBufferingState<SerializableBufferingStateType::kPipeline>,
    "pipeline_buffering_state");

}  // namespace media

#endif  // MEDIA_BASE_MEDIA_LOG_EVENTS_H_