////////////////////////////////////////////////////////////////////////////
//
// Copyright 2016 Realm Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
////////////////////////////////////////////////////////////////////////////

/**
 * @memberof Realm
 */
class Sync {
	/**
	 * Add a sync listener to listen to changes across multiple Realms
	 * @param {string} server_url - the sync server to listen to
	 * @param {SyncUser} admin_user - an admin user obtained by calling `new Realm.Sync.User.adminUser`
	 * @param {string} regex - a regular expression used to determine which cahnged Realms should trigger events -
	 *  Use `.*` to match all all Realms
	 * @param {string} name - The name of event that should cause the callback to be called
     *   _Currently only the 'change' event is supported_
	 * @param {function(change_event)} change_callback - called when changes are made to any Realm which
	 *  match the given regular expression
	 */
	static addListener(server_url, admin_user, regex, name, change_callback) {}

	/**
	 * Remove a previously registered sync listener
	 * @param {string} regex - the regular expression previously used to register the listener
     * @param {string} name - The event name
     *   _Currently only the 'change' event is supported_
	 * @param {function(change_event)} change_callback - the previously registered callback to be removed
	 */
	static removeListener(regex, name, change_callback) {}

	/**
	 * Remove all previously regiestered listeners
	 * @param {string} [name] - The name of the event whose listeners should be removed.
     *   _Currently only the 'change' event is supported_
	 */
	static removeAllListeners(name) {}

	/**
	 * Set the sync log level.
	 * @param {string} log_level
	 */
	static setLogLevel(log_level) {}

}

/**
 * Change info passed when receiving sync 'change' events
 * @memberof Realm.Sync
 */
class ChangeEvent {
    /**
     * The path of the changed Realm
     * @type {string}
     */
    get path() {}

    /**
     * The changed realm
     * @type {Realm}
     */
    get realm() {}

    /**
     * The changed Realm at the old state before the changes were applied
     * @type {Realm}
     */
    get oldRealm() {}

    /**
     * The change indexes for all added, removed, and modified objects in the changed Realm.
     * This object is a hashmap of object types to arrays of indexes for all changed objects:
     * @example
     * { 
     *   object_type_1: { 
     *     insertions:    [indexes...],
     *     deletions:     [indexes...],
     *     modifications: [indexes...]
     *   },
     *   object_type_2:
     *     ...
     * }
     * @type {object}
     */
    get changes() {}
}

/**
 * @typedef Realm.Sync~LogLevel
 * @type {("error"|"info"|"debug")}
 */

/**
 * Class that describes authentication errors in the Realm Object Server
 * @memberof Realm.Sync
 */
class AuthError extends Error {
    /**
     * The numerical code for this error.
     * @type {number}
     */
    get code() {}

    /**
     * The unique help URI that describes this error.
     * @type {string}
     */
    get type() {}
}

/**
 * Class for logging in and managing Sync users.
 * @memberof Realm.Sync
 */
class User {
	/**
	 * Login a sync user with username and password.
	 * @param {string} server - authentication server
	 * @param {string} username
	 * @param {string} password
	 * @param {function(error, user)} callback - called with the following arguments:
	 *   - `error` - an Error object is provided on failure
	 *   - `user` - a valid User object on success
	 */
	login(server, username, password, callback) {}

	/**
	 * Login a sync user using an external login provider.
	 * @param {string} server - authentication server
	 * @param {string} provider - The provider type
	 * @param {string} providerToken - The access token for the given provider
	 * @param {function(error, User)} callback - called with the following arguments:
	 *   - `error` - an Error object is provided on failure
	 *   - `user` - a valid User object on success
	 */
	loginWithProvider(server, provider, providerToken, callback) {}

	/**
	 * Create a new user using the username/password provider
	 * @param {string} server - authentication server
	 * @param {string} username
	 * @param {string} password
	 * @param {function(error, User)} callback - called with the following arguments:
	 *   - `error` - an Error object is provided on failure
	 *   - `user` - a valid User object on success
	 */
	create(server, username, password, callback) {}

	/**
	 * Create an admin user for the given authentication server with an existing token
	 * @param {string} adminToken - existing admin token
	 * @return {User} - admin user populated with the given token and server
	 */
	adminUser(adminToken) {}

	/**
	 * A dictionary containing users that are currently logged in.
	 * The keys in the dictionary are user identities, values are corresponding User objects.
	 * @type {object}
	 */
	get all() {}

	/**
	 * Get the currently logged in user.
	 * Throws error if > 1 user logged in, returns undefined if no users logged in.
	 * @type {User}
	 */
	get current() {}
}