/**
 * Copyright 2018 The Nakama Authors
 *
 * 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.
 */

namespace Nakama
{
    using System.Collections.Generic;
    using System.Runtime.Serialization;

    /// <summary>
    /// A chat channel on the server.
    /// </summary>
    public interface IChannel
    {
        /// <summary>
        /// The server-assigned channel ID.
        /// </summary>
        string Id { get; }

        /// <summary>
        /// The presences visible on the chat channel.
        /// </summary>
        IEnumerable<IUserPresence> Presences { get; }

        /// <summary>
        /// The presence of the current user. i.e. Your self.
        /// </summary>
        IUserPresence Self { get; }
    }

    /// <inheritdoc />
    internal class Channel : IChannel
    {
        [DataMember(Name="id")]
        public string Id { get; set; }

        public IEnumerable<IUserPresence> Presences => _presences ?? new List<UserPresence>(0);
        [DataMember(Name="presences")]
        public List<UserPresence> _presences { get; set; }

        public IUserPresence Self => _self;
        [DataMember(Name="self")]
        public UserPresence _self { get; set; }

        /// <inheritdoc />
        public override string ToString()
        {
            var presences = string.Join(",", Presences);
            return $"Channel[Id={Id}, Presences=({presences}), Self={Self}]";
        }
    }
}