// 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 "chrome/browser/media/media_stream_infobar_delegate.h"

#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "base/strings/utf_string_conversions.h"
#include "chrome/browser/infobars/infobar_service.h"
#include "chrome/common/url_constants.h"
#include "chrome/grit/generated_resources.h"
#include "components/google/core/browser/google_util.h"
#include "components/infobars/core/infobar.h"
#include "content/public/browser/web_contents.h"
#include "grit/components_strings.h"
#include "grit/theme_resources.h"
#include "ui/base/l10n/l10n_util.h"
#include "url/gurl.h"

namespace {

enum DevicePermissionActions {
  kAllowHttps = 0,
  kAllowHttp,
  kDeny,
  kCancel,
  kPermissionActionsMax  // Must always be last!
};

}  // namespace

MediaStreamInfoBarDelegate::~MediaStreamInfoBarDelegate() {
}

// static
bool MediaStreamInfoBarDelegate::Create(
    content::WebContents* web_contents,
    const content::MediaStreamRequest& request,
    const content::MediaResponseCallback& callback) {
  scoped_ptr<MediaStreamDevicesController> controller(
      new MediaStreamDevicesController(web_contents, request, callback));
  if (controller->DismissInfoBarAndTakeActionOnSettings())
    return false;

  InfoBarService* infobar_service =
      InfoBarService::FromWebContents(web_contents);
  if (!infobar_service) {
    // Deny the request if there is no place to show the infobar, e.g. when
    // the request comes from a background extension page.
    controller->Deny(false, content::MEDIA_DEVICE_INVALID_STATE);
    return false;
  }

  scoped_ptr<infobars::InfoBar> infobar(
      ConfirmInfoBarDelegate::CreateInfoBar(scoped_ptr<ConfirmInfoBarDelegate>(
          new MediaStreamInfoBarDelegate(controller.Pass()))));
  for (size_t i = 0; i < infobar_service->infobar_count(); ++i) {
    infobars::InfoBar* old_infobar = infobar_service->infobar_at(i);
    if (old_infobar->delegate()->AsMediaStreamInfoBarDelegate()) {
      infobar_service->ReplaceInfoBar(old_infobar, infobar.Pass());
      return true;
    }
  }
  infobar_service->AddInfoBar(infobar.Pass());
  return true;
}

MediaStreamInfoBarDelegate::MediaStreamInfoBarDelegate(
    scoped_ptr<MediaStreamDevicesController> controller)
    : ConfirmInfoBarDelegate(),
      controller_(controller.Pass()) {
  DCHECK(controller_.get());
  DCHECK(controller_->HasAudio() || controller_->HasVideo());
}

void MediaStreamInfoBarDelegate::InfoBarDismissed() {
  // Deny the request if the infobar was closed with the 'x' button, since
  // we don't want WebRTC to be waiting for an answer that will never come.
  UMA_HISTOGRAM_ENUMERATION("Media.DevicePermissionActions",
                            kCancel, kPermissionActionsMax);
  controller_->Deny(false, content::MEDIA_DEVICE_PERMISSION_DISMISSED);
}

int MediaStreamInfoBarDelegate::GetIconID() const {
  return controller_->HasVideo() ?
      IDR_INFOBAR_MEDIA_STREAM_CAMERA : IDR_INFOBAR_MEDIA_STREAM_MIC;
}

infobars::InfoBarDelegate::Type MediaStreamInfoBarDelegate::GetInfoBarType()
    const {
  return PAGE_ACTION_TYPE;
}

MediaStreamInfoBarDelegate*
    MediaStreamInfoBarDelegate::AsMediaStreamInfoBarDelegate() {
  return this;
}

base::string16 MediaStreamInfoBarDelegate::GetMessageText() const {
  int message_id = IDS_MEDIA_CAPTURE_AUDIO_AND_VIDEO;
  if (!controller_->HasAudio())
    message_id = IDS_MEDIA_CAPTURE_VIDEO_ONLY;
  else if (!controller_->HasVideo())
    message_id = IDS_MEDIA_CAPTURE_AUDIO_ONLY;
  return l10n_util::GetStringFUTF16(
      message_id, base::UTF8ToUTF16(controller_->GetSecurityOriginSpec()));
}

base::string16 MediaStreamInfoBarDelegate::GetButtonLabel(
    InfoBarButton button) const {
  return l10n_util::GetStringUTF16((button == BUTTON_OK) ?
      IDS_MEDIA_CAPTURE_ALLOW : IDS_MEDIA_CAPTURE_DENY);
}

bool MediaStreamInfoBarDelegate::Accept() {
  GURL origin(controller_->GetSecurityOriginSpec());
  if (origin.SchemeIsSecure()) {
    UMA_HISTOGRAM_ENUMERATION("Media.DevicePermissionActions",
                              kAllowHttps, kPermissionActionsMax);
  } else {
    UMA_HISTOGRAM_ENUMERATION("Media.DevicePermissionActions",
                              kAllowHttp, kPermissionActionsMax);
  }
  controller_->Accept(true);
  return true;
}

bool MediaStreamInfoBarDelegate::Cancel() {
  UMA_HISTOGRAM_ENUMERATION("Media.DevicePermissionActions",
                            kDeny, kPermissionActionsMax);
  controller_->Deny(true, content::MEDIA_DEVICE_PERMISSION_DENIED);
  return true;
}

base::string16 MediaStreamInfoBarDelegate::GetLinkText() const {
  return l10n_util::GetStringUTF16(IDS_LEARN_MORE);
}

bool MediaStreamInfoBarDelegate::LinkClicked(
    WindowOpenDisposition disposition) {
  InfoBarService::WebContentsFromInfoBar(infobar())->OpenURL(
      content::OpenURLParams(
          GURL(chrome::kMediaAccessLearnMoreUrl),
          content::Referrer(),
          (disposition == CURRENT_TAB) ? NEW_FOREGROUND_TAB : disposition,
          ui::PAGE_TRANSITION_LINK, false));

  return false;  // Do not dismiss the info bar.
}