// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_ASH_LOGIN_QUICK_UNLOCK_PIN_STORAGE_PREFS_H_
#define CHROME_BROWSER_ASH_LOGIN_QUICK_UNLOCK_PIN_STORAGE_PREFS_H_

#include <string>

#include "base/memory/raw_ptr.h"
#include "chromeos/ash/components/login/auth/public/key.h"

class PrefRegistrySimple;
class PrefService;

namespace ash {
namespace quick_unlock {
enum class Purpose;

class PinStoragePrefs {
 public:
  static const int kMaximumUnlockAttempts = 3;

  // Registers profile prefs.
  static void RegisterProfilePrefs(PrefRegistrySimple* registry);

  explicit PinStoragePrefs(PrefService* pref_service);

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

  ~PinStoragePrefs();

  // Add a PIN unlock attempt count.
  void AddUnlockAttempt();
  // Reset the unlock attempt count to 0. Not applicable to all implementations.
  void ResetUnlockAttemptCount();
  // Returns the number of unlock attempts.
  int unlock_attempt_count() const { return unlock_attempt_count_; }

  // Returns true if a pin is set.
  bool IsPinSet() const;
  // Sets the pin to the given value; IsPinSet will return true.
  void SetPin(const std::string& pin);
  // Removes the pin; IsPinSet will return false.
  void RemovePin();

  // Is PIN entry currently available?
  bool IsPinAuthenticationAvailable(Purpose purpose) const;

  // Tries to authenticate the given pin. This will consume an unlock attempt.
  // This always returns false if IsPinAuthenticationAvailable returns false.
  bool TryAuthenticatePin(const Key& key, Purpose purpose);

  // Return the stored salt/secret. This is fetched directly from pref_service_.
  std::string PinSalt() const;
  std::string PinSecret() const;

 private:
  raw_ptr<PrefService> pref_service_;
  int unlock_attempt_count_ = 0;
};

}  // namespace quick_unlock
}  // namespace ash

#endif  // CHROME_BROWSER_ASH_LOGIN_QUICK_UNLOCK_PIN_STORAGE_PREFS_H_