// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_SYNC_SERVICE_SYNC_USER_SETTINGS_H_
#define COMPONENTS_SYNC_SERVICE_SYNC_USER_SETTINGS_H_

#include <memory>
#include <string>
#include <vector>

#include "base/time/time.h"
#include "components/sync/base/data_type.h"
#include "components/sync/base/passphrase_enums.h"
#include "components/sync/base/user_selectable_type.h"
#include "google_apis/gaia/gaia_id.h"

namespace syncer {

class Nigori;

// This class encapsulates all the user-configurable bits of Sync.
class SyncUserSettings {
 public:
  enum class UserSelectableTypePrefState {
    // UserSelectableType is disabled by the user.
    kDisabled,
    // UserSelectableType is enabled by the user, or no user choice affected it.
    kEnabledOrDefault,
    // The type state is not available; when sync-the-feature is enabled, or the
    // user is signed out.
    kNotApplicable,
  };

  virtual ~SyncUserSettings() = default;

  // Whether the initial Sync Feature setup has been completed, meaning the
  // user has turned on Sync-the-Feature.
  // NOTE: On ChromeOS, this gets set automatically, so it doesn't really mean
  // anything.
  virtual bool IsInitialSyncFeatureSetupComplete() const = 0;

#if !BUILDFLAG(IS_CHROMEOS)
  virtual void SetInitialSyncFeatureSetupComplete() = 0;
#endif  // !BUILDFLAG(IS_CHROMEOS)

  // Getting selected types, for both Sync-the-feature and Sync-the-transport
  // users.
  virtual UserSelectableTypeSet GetSelectedTypes() const = 0;
  virtual bool IsTypeManagedByPolicy(UserSelectableType type) const = 0;
  virtual bool IsTypeManagedByCustodian(UserSelectableType type) const = 0;

  // Returns UserSelectableTypePrefState::kDisabled if the type is disabled by a
  // user choice. Otherwise, returns
  // UserSelectableTypePrefState::kEnabledOrDefault if no value exists for the
  // type pref (default), or if it was enabled. Note: this method checks the
  // actual pref value.
  virtual SyncUserSettings::UserSelectableTypePrefState
  GetTypePrefStateForAccount(UserSelectableType type) const = 0;

  // Whether the "Sync everything" is enabled. This only has an effect if
  // Sync-the-feature is enabled. Note that even if this is true, some types may
  // be disabled e.g. due to enterprise policy.
  virtual bool IsSyncEverythingEnabled() const = 0;
  // Sets user's selected types to all types if `sync_everything` is true (in
  // this case `types` is ignored). Otherwise, sets user's selected types to the
  // `types` set only.
  virtual void SetSelectedTypes(bool sync_everything,
                                UserSelectableTypeSet types) = 0;

  // Sets an individual type selection. For Sync-the-feature mode, invoking
  // this function is only allowed while IsSyncEverythingEnabled() returns
  // false.
  virtual void SetSelectedType(UserSelectableType type, bool is_type_on) = 0;

  // Resets an individual type selection to its default value. Must only be
  // called for signed-in non-syncing users.
  virtual void ResetSelectedType(UserSelectableType type) = 0;

  // Clears per account prefs for all users *except* the ones in the passed-in
  // `available_gaia_ids`.
  virtual void KeepAccountSettingsPrefsOnlyForUsers(
      const std::vector<GaiaId>& available_gaia_ids) = 0;

  // Registered user selectable types are derived from registered data types.
  // A UserSelectableType is registered if any of its DataTypes is registered.
  virtual UserSelectableTypeSet GetRegisteredSelectableTypes() const = 0;

#if BUILDFLAG(IS_CHROMEOS)
  // Relevant only on ChromeOS (Ash), since the state is unreachable otherwise.
  // Returns if sync-the-feature is disabled because the user cleared data from
  // the Sync dashboard.
  virtual bool IsSyncFeatureDisabledViaDashboard() const = 0;

  // Causes `IsSyncFeatureDisabledViaDashboard()` above to return false,
  // usually representing that the user took some action to confirm it is OK
  // to resume Sync.
  virtual void ClearSyncFeatureDisabledViaDashboard() = 0;

  // As above, but for Chrome OS-specific data types. These are controlled by
  // toggles in the OS Settings UI.
  virtual bool IsSyncAllOsTypesEnabled() const = 0;
  virtual UserSelectableOsTypeSet GetSelectedOsTypes() const = 0;
  virtual bool IsOsTypeManagedByPolicy(UserSelectableOsType type) const = 0;
  virtual void SetSelectedOsTypes(bool sync_all_os_types,
                                  UserSelectableOsTypeSet types) = 0;
  virtual UserSelectableOsTypeSet GetRegisteredSelectableOsTypes() const = 0;
#endif  // BUILDFLAG(IS_CHROMEOS)

  // Encryption state.

  // Whether the user is allowed to set a custom passphrase to encrypt all
  // their Sync data. For example, child accounts aren't allowed to do.
  virtual bool IsCustomPassphraseAllowed() const = 0;

  // Whether an explicit passphrase is in use, which means either a custom
  // passphrase or a legacy frozen implicit passphrase.
  virtual bool IsUsingExplicitPassphrase() const = 0;
  // The type of the passphrase currently in use. Returns nullopt if the state
  // isn't known, i.e. before the engine has been initialized successfully at
  // least once (in particular, it's nullopt for all signed-out users).
  virtual std::optional<PassphraseType> GetPassphraseType() const = 0;

  // Passphrase prompt mute-state getter and setter, used on Android.
  virtual bool IsPassphrasePromptMutedForCurrentProductVersion() const = 0;
  virtual void MarkPassphrasePromptMutedForCurrentProductVersion() = 0;

  // NOTE: All of the state below may only be queried or modified if the Sync
  // engine is initialized.
  // TODO(crbug.com/40923935): Make it possible to call these APIs even without
  // the engine being initialized.

  // Whether we are currently set to encrypt all the Sync data.
  virtual bool IsEncryptEverythingEnabled() const = 0;
  // The current set of encrypted data types.
  virtual DataTypeSet GetAllEncryptedDataTypes() const = 0;
  // Whether a passphrase is required for encryption or decryption to proceed.
  // Note that Sync might still be working fine if the user has disabled all
  // encrypted data types.
  virtual bool IsPassphraseRequired() const = 0;
  // Whether a passphrase is required to decrypt the data for any currently
  // enabled data type.
  virtual bool IsPassphraseRequiredForPreferredDataTypes() const = 0;
  // Whether trusted vault keys are required for encryption or decryption. Note
  // that Sync might still be working fine if the user has disabled all
  // encrypted data types.
  virtual bool IsTrustedVaultKeyRequired() const = 0;
  // Whether keystore keys are required for encryption or decryption to proceed.
  virtual bool IsKeystoreKeyRequiredForTesting() const = 0;
  // Whether trusted vault keys are required for encryption or decryption to
  // proceed for currently enabled data types.
  virtual bool IsTrustedVaultKeyRequiredForPreferredDataTypes() const = 0;
  // Whether recoverability of the trusted vault keys is degraded and user
  // action is required, affecting currently enabled data types.
  virtual bool IsTrustedVaultRecoverabilityDegraded() const = 0;
  // The time the current explicit passphrase (if any) was set. If no explicit
  // passphrase is in use, or no time is available, returns an unset base::Time.
  virtual base::Time GetExplicitPassphraseTime() const = 0;

  // Asynchronously sets the passphrase to `passphrase` for encryption.
  virtual void SetEncryptionPassphrase(const std::string& passphrase) = 0;
  // Asynchronously decrypts pending keys using `passphrase`. Returns false
  // immediately if the passphrase could not be used to decrypt a locally cached
  // copy of encrypted keys; returns true otherwise. This method shouldn't be
  // called when passphrase isn't required.
  [[nodiscard]] virtual bool SetDecryptionPassphrase(
      const std::string& passphrase) = 0;
};

}  // namespace syncer

#endif  // COMPONENTS_SYNC_SERVICE_SYNC_USER_SETTINGS_H_