/*
 * This file is part of matrix-glib-sdk
 *
 * matrix-glib-sdk is free software: you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation, either
 * version 3 of the License, or (at your option) any later version.
 *
 * matrix-glib-sdk is distributed in the hope that it will be
 * useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with matrix-glib-sdk. If not, see
 * <http://www.gnu.org/licenses/>.
 */

/**
 * Class to hold a m.room.canonical_alias event
 *
 * This event is used to inform the room about which alias should be
 * considered the canonical one. This could be for display purposes or
 * as suggestion to users which alias to use to advertise the room.
 */
public class Matrix.Event.RoomCanonicalAlias : Matrix.Event.State {
    /**
     * The canonical alias.
     */
    public string? canonical_alias { get; set; default = null; }

    protected override void
    from_json(Json.Node json_data)
        throws Matrix.Error
    {
        var root = json_data.get_object();
        var content_root = root.get_member("content").get_object();
        Json.Node? node = null;

        if (Config.DEBUG && ((node = root.get_member("state_key")) != null)) {
            if (node.get_string() != "") {
                warning("state_key of a m.room.canonical_alias event is non-empty");
            }
        }

        if ((node = content_root.get_member("alias")) != null) {
            _canonical_alias = node.get_string();
        }

        base.from_json(json_data);
    }

    protected override void
    to_json(Json.Node json_data)
        throws Matrix.Error
    {
        var content_root = json_data.get_object()
            .get_member("content").get_object();

        if (_state_key != "") {
            throw new Matrix.Error.INCOMPLETE(
                    "Won't generate a m.room.canonical_alias event with a non-empty state_key");
        }

        if (_canonical_alias != null) {
            content_root.set_string_member("alias", _canonical_alias);
        }

        base.to_json(json_data);
    }
}