// Copyright (c) 2012 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.

#include "content/public/browser/web_contents_observer.h"

#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/browser/navigation_details.h"
#include "content/public/browser/render_view_host.h"

namespace content {

WebContentsObserver::WebContentsObserver(WebContents* web_contents)
    : web_contents_(nullptr) {
  Observe(web_contents);
}

WebContentsObserver::WebContentsObserver()
    : web_contents_(nullptr) {
}

WebContentsObserver::~WebContentsObserver() {
  if (web_contents_)
    web_contents_->RemoveObserver(this);
}

WebContentsObserver::MediaPlayerId::MediaPlayerId(
    RenderFrameHost* render_frame_host,
    int delegate_id)
    : render_frame_host(render_frame_host), delegate_id(delegate_id) {}

WebContentsObserver::MediaPlayerId
WebContentsObserver::MediaPlayerId::createMediaPlayerIdForTests() {
  return WebContentsObserver::MediaPlayerId();
}

bool WebContentsObserver::MediaPlayerId::operator==(
    WebContentsObserver::MediaPlayerId const& other) const {
  return render_frame_host == other.render_frame_host &&
         delegate_id == other.delegate_id;
}

bool WebContentsObserver::MediaPlayerId::operator!=(
    const MediaPlayerId& other) const {
  return render_frame_host != other.render_frame_host ||
         delegate_id != other.delegate_id;
}

bool WebContentsObserver::MediaPlayerId::operator<(
    const MediaPlayerId& other) const {
  if (render_frame_host == other.render_frame_host)
    return delegate_id < other.delegate_id;
  return render_frame_host < other.render_frame_host;
}

WebContents* WebContentsObserver::web_contents() const {
  return web_contents_;
}

void WebContentsObserver::Observe(WebContents* web_contents) {
  if (web_contents == web_contents_) {
    // Early exit to avoid infinite loops if we're in the middle of a callback.
    return;
  }
  if (web_contents_)
    web_contents_->RemoveObserver(this);
  web_contents_ = static_cast<WebContentsImpl*>(web_contents);
  if (web_contents_) {
    web_contents_->AddObserver(this);
  }
}

bool WebContentsObserver::OnMessageReceived(
    const IPC::Message& message,
    RenderFrameHost* render_frame_host) {
  return false;
}

bool WebContentsObserver::OnMessageReceived(const IPC::Message& message) {
  return false;
}

void WebContentsObserver::ResetWebContents() {
  web_contents_->RemoveObserver(this);
  web_contents_ = nullptr;
}

}  // namespace content