/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

namespace logins {
    /// We expose the crypto primitives on the namespace

    /// Create a new, random, encryption key.
    [Throws=LoginsApiError]
    string create_key();

    /// Create a "canary" string, which can be used to test if the encryption
    //key is still valid for the logins data
    [Throws=LoginsApiError]
    string create_canary([ByRef]string text, [ByRef]string encryption_key);

    /// Check that key is still valid using the output of `create_canary`.
    //`text` much match the text you initially passed to `create_canary()`
    [Throws=LoginsApiError]
    boolean check_canary([ByRef]string canary, [ByRef]string text, [ByRef]string encryption_key);

    /// Utility function to create a StaticKeyManager to be used for the time
    /// being until support lands for [trait implementation of an UniFFI
    /// interface](https://mozilla.github.io/uniffi-rs/next/proc_macro/index.html#structs-implementing-traits)
    /// in UniFFI. 
    KeyManager create_static_key_manager(string key);

    /// Similar to create_static_key_manager above, create a
    /// ManagedEncryptorDecryptor by passing in a KeyManager
    EncryptorDecryptor create_managed_encdec(KeyManager key_manager);

    /// Create a LoginStore with StaticKeyManager by passing in a db path and a
    /// static key
    LoginStore create_login_store_with_static_key_manager(string path, string key);
};

/// A login entry from the user, not linked to any database record.
/// The add/update APIs input these.
dictionary LoginEntry {
    // login fields
    string origin;
    string? http_realm;
    string? form_action_origin;
    string username_field;
    string password_field;

    // secure login fields
    string password;
    string username;
};

/// Login data specific to database records.
/// The add_with_record API inputs this.
dictionary LoginMeta {
    string id;
    i64 times_used;
    i64 time_created;
    i64 time_last_used;
    i64 time_password_changed;
};

/// A login together with record fields, handed over to the store API; ie a login persisted
/// elsewhere, useful for migrations
dictionary LoginEntryWithMeta {
    LoginEntry entry;
    LoginMeta meta;
};

/// A bulk insert result entry, returned by `add_many` and `add_many_with_meta`
[Enum]
interface BulkResultEntry {
    Success(Login login);
    Error(string message);
};

/// A login stored in the database
dictionary Login {
    // meta fields
    string id;
    i64 times_used;
    i64 time_created;
    i64 time_last_used;
    i64 time_password_changed;

    // login fields
    string origin;
    string? http_realm;
    string? form_action_origin;
    string username_field;
    string password_field;

    // secure login fields
    string password;
    string username;
};

/// Metrics tracking deletion of logins that cannot be decrypted, see `delete_undecryptable_records_for_remote_replacement`
/// for more details
dictionary LoginsDeletionMetrics {
    u64 local_deleted;
    u64 mirror_deleted;
};

/// These are the errors returned by our public API.
[Error]
interface LoginsApiError {
    /// NSS not initialized.
    NSSUninitialized();

    /// NSS error during authentication
    NSSAuthenticationError(string reason);

    /// error during authentication (in PrimaryPasswordAuthenticator)
    AuthenticationError(string reason);

    /// authentication has been cancelled.
    AuthenticationCanceled();

    /// The login data supplied is invalid. The reason will indicate what's wrong with it.
    InvalidRecord(string reason);

    /// Asking to do something with a guid which doesn't exist.
    NoSuchRecord(string reason);

    /// Encryption key is missing.
    MissingKey();

    /// Encryption key is not valid.
    InvalidKey();

    /// encryption failed
    EncryptionFailed(string reason);

    /// decryption failed
    DecryptionFailed(string reason);

    /// An operation was interrupted at the request of the consuming app.
    Interrupted(string reason);

    /// Sync reported that authentication failed and the user should re-enter their FxA password.
    // TODO: remove this at the same time as remove the sync() method in favour of the SyncManager.
    SyncAuthInvalid(string reason);

    /// something internal went wrong which doesn't have a public error value
    /// because the consuming app can not reasonably take any action to resolve it.
    /// The underlying error will have been logged and reported.
    /// (ideally would just be `Unexpected`, but that would be a breaking change)
    UnexpectedLoginsApiError(string reason);
};

[Trait, WithForeign]
interface EncryptorDecryptor {
    [Throws=LoginsApiError]
    bytes encrypt(bytes cleartext);

    [Throws=LoginsApiError]
    bytes decrypt(bytes ciphertext);
};

[Trait, WithForeign]
interface KeyManager {
    [Throws=LoginsApiError]
    bytes get_key();
};

interface StaticKeyManager {
    constructor(string key);
};

interface ManagedEncryptorDecryptor {
    constructor(KeyManager key_manager);
};

interface LoginStore {
    [Throws=LoginsApiError]
    constructor(string path, EncryptorDecryptor encdec);

    [Throws=LoginsApiError]
    Login add(LoginEntry login);

    [Throws=LoginsApiError]
    sequence<BulkResultEntry> add_many(sequence<LoginEntry> logins);

    [Throws=LoginsApiError]
    Login add_with_meta(LoginEntryWithMeta entry_with_meta);

    [Throws=LoginsApiError]
    sequence<BulkResultEntry> add_many_with_meta(sequence<LoginEntryWithMeta> entries_with_meta);

    [Throws=LoginsApiError]
    Login update([ByRef] string id, LoginEntry login);

    [Throws=LoginsApiError]
    Login add_or_update(LoginEntry login);

    [Throws=LoginsApiError]
    boolean delete([ByRef] string id);

    [Throws=LoginsApiError, Self=ByArc]
    sequence<boolean> delete_many(sequence<string> ids);

    /// Clear out locally stored logins data
    ///
    /// If sync is enabled, then we will try to recover the data on the next sync.
    ///
    /// The main reason to call this is when regenerating a new encryption key.
    /// In that case, there's no reason to keep around the local data since it can't be decrypted.
    /// Calling `wipe_local` is better than keeping around these un-decryptable logins, since we
    /// might be able to recover the data via sync.
    ///
    /// This is a no-op for freshly created databases, so it's safe to call this whenever a key is
    /// generated.
    [Throws=LoginsApiError]
    void wipe_local();

    [Throws=LoginsApiError, Self=ByArc]
    void reset();

    /// The `delete_undecryptable_records_for_remote_replacement` function locally deletes stored logins
    /// that cannot be decrypted and sets the last sync time to 0 so any existing server records can be downloaded
    /// and overwrite the locally deleted records.
    ///
    /// NB: This function was created to unblock iOS logins users who are unable to sync logins and should not be used
    /// outside of this use case.
    [Throws=LoginsApiError, Self=ByArc]
    LoginsDeletionMetrics delete_undecryptable_records_for_remote_replacement();

    [Throws=LoginsApiError]
    void touch([ByRef] string id);

    [Throws=LoginsApiError]
    boolean is_empty();

    [Throws=LoginsApiError]
    i64 count();

    [Throws=LoginsApiError]
    i64 count_by_origin([ByRef] string origin);

    [Throws=LoginsApiError]
    i64 count_by_form_action_origin([ByRef] string form_action_origin);

    [Throws=LoginsApiError]
    sequence<Login> list();

    [Throws=LoginsApiError]
    sequence<Login> get_by_base_domain([ByRef] string base_domain);

    [Throws=LoginsApiError]
    boolean has_logins_by_base_domain([ByRef] string base_domain);

    [Throws=LoginsApiError]
    Login? find_login_to_update(LoginEntry look);

    [Throws=LoginsApiError]
    Login? get([ByRef] string id);

    [Throws=LoginsApiError]
    void set_checkpoint([ByRef] string checkpoint);

    [Throws=LoginsApiError]
    string? get_checkpoint();

    /// Run maintenance on the DB
    ///
    /// This is intended to be run during idle time and will take steps / to clean up / shrink the
    /// database.
    [Throws=LoginsApiError]
    void run_maintenance();

    [Self=ByArc]
    void register_with_sync_manager();

    [Self=ByArc]
    void shutdown();
};