// Copyright 2017 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/browser/geolocation/geolocation_service_impl.h"

#include <utility>

#include "base/bind.h"
#include "content/browser/permissions/permission_controller_impl.h"
#include "content/public/browser/permission_type.h"
#include "content/public/browser/render_frame_host.h"
#include "content/public/browser/render_process_host.h"
#include "content/public/browser/web_contents.h"
#include "mojo/public/cpp/bindings/callback_helpers.h"
#include "third_party/blink/public/mojom/permissions_policy/permissions_policy.mojom.h"

namespace content {

GeolocationServiceImplContext::GeolocationServiceImplContext(
    PermissionControllerImpl* permission_controller)
    : permission_controller_(permission_controller) {}

GeolocationServiceImplContext::~GeolocationServiceImplContext() {
}

void GeolocationServiceImplContext::RequestPermission(
    RenderFrameHost* render_frame_host,
    bool user_gesture,
    PermissionCallback callback) {
  if (has_pending_permission_request_) {
    mojo::ReportBadMessage(
        "GeolocationService client may only create one Geolocation at a "
        "time.");
    return;
  }

  has_pending_permission_request_ = true;
  permission_controller_->RequestPermission(
      PermissionType::GEOLOCATION, render_frame_host,
      render_frame_host->GetLastCommittedOrigin().GetURL(), user_gesture,
      base::BindOnce(&GeolocationServiceImplContext::HandlePermissionStatus,
                     weak_factory_.GetWeakPtr(), std::move(callback)));
}

void GeolocationServiceImplContext::HandlePermissionStatus(
    PermissionCallback callback,
    blink::mojom::PermissionStatus permission_status) {
  has_pending_permission_request_ = false;
  std::move(callback).Run(permission_status);
}

GeolocationServiceImpl::GeolocationServiceImpl(
    device::mojom::GeolocationContext* geolocation_context,
    RenderFrameHost* render_frame_host)
    : geolocation_context_(geolocation_context),
      render_frame_host_(render_frame_host) {
  DCHECK(geolocation_context);
  DCHECK(render_frame_host);

  permission_controller_ = PermissionControllerImpl::FromBrowserContext(
      render_frame_host_->GetProcess()->GetBrowserContext());
}

GeolocationServiceImpl::~GeolocationServiceImpl() {}

void GeolocationServiceImpl::Bind(
    mojo::PendingReceiver<blink::mojom::GeolocationService> receiver) {
  receiver_set_.Add(
      this, std::move(receiver),
      std::make_unique<GeolocationServiceImplContext>(permission_controller_));
}

void GeolocationServiceImpl::CreateGeolocation(
    mojo::PendingReceiver<device::mojom::Geolocation> receiver,
    bool user_gesture,
    CreateGeolocationCallback callback) {
  if (!render_frame_host_->IsFeatureEnabled(
          blink::mojom::PermissionsPolicyFeature::kGeolocation)) {
    std::move(callback).Run(blink::mojom::PermissionStatus::DENIED);
    return;
  }

  // If the geolocation service is destroyed before the callback is run, ensure
  // it is called with DENIED status.
  auto scoped_callback = mojo::WrapCallbackWithDefaultInvokeIfNotRun(
      std::move(callback), blink::mojom::PermissionStatus::DENIED);

  receiver_set_.current_context()->RequestPermission(
      render_frame_host_, user_gesture,
      // There is an assumption here that the GeolocationServiceImplContext will
      // outlive the GeolocationServiceImpl.
      base::BindOnce(
          &GeolocationServiceImpl::CreateGeolocationWithPermissionStatus,
          base::Unretained(this), std::move(receiver),
          std::move(scoped_callback)));
}

void GeolocationServiceImpl::CreateGeolocationWithPermissionStatus(
    mojo::PendingReceiver<device::mojom::Geolocation> receiver,
    CreateGeolocationCallback callback,
    blink::mojom::PermissionStatus permission_status) {
  std::move(callback).Run(permission_status);
  if (permission_status != blink::mojom::PermissionStatus::GRANTED)
    return;

  WebContents* web_contents =
      WebContents::FromRenderFrameHost(render_frame_host_);

  geolocation_context_->BindGeolocation(
      std::move(receiver), web_contents->GetLastCommittedURL().GetOrigin());
}

}  // namespace content