// 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 CONTENT_BROWSER_SMS_WEBOTP_SERVICE_H_
#define CONTENT_BROWSER_SMS_WEBOTP_SERVICE_H_

#include <memory>
#include <string>

#include "base/callback_forward.h"
#include "base/macros.h"
#include "base/sequence_checker.h"
#include "base/time/time.h"
#include "content/browser/sms/sms_parser.h"
#include "content/browser/sms/sms_queue.h"
#include "content/browser/sms/user_consent_handler.h"
#include "content/common/content_export.h"
#include "content/public/browser/frame_service_base.h"
#include "mojo/public/cpp/bindings/pending_receiver.h"
#include "third_party/blink/public/mojom/sms/webotp_service.mojom.h"
#include "url/origin.h"

namespace content {

class RenderFrameHost;
class SmsFetcher;
struct LoadCommittedDetails;

// WebOTPService handles mojo connections from the renderer, observing the
// incoming SMS messages from an SmsFetcher. In practice, it is owned and
// managed by a RenderFrameHost. It accomplishes that via subclassing
// FrameServiceBase, which observes the lifecycle of a RenderFrameHost and
// manages it own memory. Create() creates a self-managed instance of
// WebOTPService and binds it to the request.
class CONTENT_EXPORT WebOTPService
    : public FrameServiceBase<blink::mojom::WebOTPService>,
      public SmsFetcher::Subscriber {
 public:
  // Return value indicates success. Creation can fail if origin requirements
  // are not met.
  static bool Create(SmsFetcher*,
                     RenderFrameHost*,
                     mojo::PendingReceiver<blink::mojom::WebOTPService>);

  WebOTPService(SmsFetcher*,
                RenderFrameHost*,
                mojo::PendingReceiver<blink::mojom::WebOTPService>);
  WebOTPService(SmsFetcher*,
                std::unique_ptr<UserConsentHandler> consent_handler,
                const url::Origin&,
                RenderFrameHost*,
                mojo::PendingReceiver<blink::mojom::WebOTPService>);
  ~WebOTPService() override;

  using FailureType = SmsFetcher::FailureType;
  using SmsParsingStatus = SmsParser::SmsParsingStatus;

  // blink::mojom::WebOTPService:
  void Receive(ReceiveCallback) override;
  void Abort() override;

  // content::SmsQueue::Subscriber
  void OnReceive(const std::string& one_time_code) override;
  void OnFailure(FailureType failure_type) override;

  // Completes the in-flight sms otp code request. Invokes the receive callback,
  // if one is available, with the provided status code and the existing one
  // time code.
  void CompleteRequest(blink::mojom::SmsStatus);

 protected:
  // content::WebContentsObserver:
  void NavigationEntryCommitted(
      const content::LoadCommittedDetails& load_details) override;

 private:
  void CleanUp();

  // |fetcher_| is safe because all instances of SmsFetcher are owned
  // by the browser context, which transitively (through RenderFrameHost) owns
  // and outlives this class.
  SmsFetcher* fetcher_;
  std::unique_ptr<UserConsentHandler> consent_handler_;

  const url::Origin origin_;
  ReceiveCallback callback_;
  base::Optional<std::string> one_time_code_;
  base::TimeTicks start_time_;
  base::TimeTicks receive_time_;

  SEQUENCE_CHECKER(sequence_checker_);

  base::WeakPtrFactory<WebOTPService> weak_ptr_factory_{this};

  DISALLOW_COPY_AND_ASSIGN(WebOTPService);
};

}  // namespace content

#endif  // CONTENT_BROWSER_SMS_WEBOTP_SERVICE_H_