// Copyright 2014 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 COMPONENTS_PERMISSIONS_PERMISSION_REQUEST_H_
#define COMPONENTS_PERMISSIONS_PERMISSION_REQUEST_H_

#include <string>

#include "base/callback.h"
#include "base/macros.h"
#include "build/build_config.h"
#include "components/content_settings/core/common/content_settings.h"
#include "components/content_settings/core/common/content_settings_types.h"
#include "components/permissions/permission_request_enums.h"
#include "third_party/abseil-cpp/absl/types/optional.h"
#include "url/gurl.h"

namespace permissions {
enum class RequestType;

// Describes the interface a feature making permission requests should
// implement. A class of this type is registered with the permission request
// manager to receive updates about the result of the permissions request
// from the bubble or infobar. It should live until it is unregistered or until
// RequestFinished is called.
// Note that no particular guarantees are made about what exact UI surface
// is presented to the user. The delegate may be coalesced with other bubble
// requests, or depending on the situation, not shown at all.
class PermissionRequest {
 public:
  // If `result` is CONTENT_SETTING_ALLOW, the permission was granted by the
  // user. If it's CONTENT_SETTING_BLOCK, the permission was blocked by the
  // user. If it's CONTENT_SETTING_DEFAULT, the permission was ignored or
  // dismissed without an explicit decision. No other ContentSetting value will
  // be passed into this callback.
  // If `is_one_time` is true, the decision will last until all tabs of
  // `requesting_origin_` are closed or navigated away from.
  using PermissionDecidedCallback =
      base::OnceCallback<void(ContentSetting /*result*/, bool /*is_one_time*/)>;

  // `permission_decided_callback` is called when the permission request is
  // resolved by the user (see comment on PermissionDecidedCallback above).
  // `delete_callback` is called when the permission request is no longer needed
  // by the permission system. Therefore, it is safe to delete `this` inside
  // `delete_callback`. It will always be called eventually by the permission
  // system.
  // `delete_callback` may be called before `permission_decided_callback`, for
  // example if the tab is closed without user interaction. In this case, the
  // javascript promise from the requesting origin will not be resolved.
  PermissionRequest(const GURL& requesting_origin,
                    RequestType request_type,
                    bool has_gesture,
                    PermissionDecidedCallback permission_decided_callback,
                    base::OnceClosure delete_callback);

  PermissionRequest(const PermissionRequest&) = delete;
  PermissionRequest& operator=(const PermissionRequest&) = delete;

  virtual ~PermissionRequest();

  GURL requesting_origin() const { return requesting_origin_; }
  RequestType request_type() const { return request_type_; }

  // Whether |this| and |other_request| are duplicates and therefore don't both
  // need to be shown in the UI.
  virtual bool IsDuplicateOf(PermissionRequest* other_request) const;

#if defined(OS_ANDROID)
  // Returns prompt text appropriate for displaying in an Android dialog.
  virtual std::u16string GetDialogMessageText() const;
#endif

#if !defined(OS_ANDROID)
  // Returns prompt text appropriate for displaying on the chip button in the
  // location bar.
  absl::optional<std::u16string> GetChipText() const;

  // Returns prompt text appropriate for displaying under the dialog title
  // "[domain] wants to:".
  virtual std::u16string GetMessageTextFragment() const;
#endif

  // Called when the user has granted the requested permission.
  // If |is_one_time| is true the permission will last until all tabs of
  // |origin| are closed or navigated away from, and then the permission will
  // automatically expire after 1 day.
  void PermissionGranted(bool is_one_time);

  // Called when the user has denied the requested permission.
  void PermissionDenied();

  // Called when the user has cancelled the permission request. This
  // corresponds to a denial, but is segregated in case the context needs to
  // be able to distinguish between an active refusal or an implicit refusal.
  void Cancelled();

  // The UI this request was associated with was answered by the user.
  // It is safe for the request to be deleted at this point -- it will receive
  // no further message from the permission request system. This method will
  // eventually be called on every request which is not unregistered.
  // It is ok to call this method without actually resolving the request via
  // PermissionGranted(), PermissionDenied() or Canceled(). However, it will not
  // resolve the javascript promise from the requesting origin.
  void RequestFinished();

  // Used to record UMA for whether requests are associated with a user gesture.
  // To keep things simple this metric is only recorded for the most popular
  // request types.
  PermissionRequestGestureType GetGestureType() const;

  // Used on Android to determine what Android OS permissions are needed for
  // this permission request.
  ContentSettingsType GetContentSettingsType() const;

 private:
  // The origin on whose behalf this permission request is being made.
  GURL requesting_origin_;

  // The type of this request.
  RequestType request_type_;

  // Whether the request was associated with a user gesture.
  bool has_gesture_;

  // Called once a decision is made about the permission.
  PermissionDecidedCallback permission_decided_callback_;

  // Called when the request is no longer in use so it can be deleted by the
  // caller.
  base::OnceClosure delete_callback_;
};

}  // namespace permissions

#endif  // COMPONENTS_PERMISSIONS_PERMISSION_REQUEST_H_