using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;

namespace fis.Vid
{
    public class DisplayChannelList
    {
        private readonly ConcurrentDictionary<string, DisplayChannel> _channels = new ConcurrentDictionary<string, DisplayChannel>();

        /// <summary>
        /// Add a channel into list
        /// </summary>
        /// <param name="channel">The channel to be added</param>
        public void Add(DisplayChannel channel)
        {
            _channels.AddOrUpdate(channel.ChannelId, channel, (channelId, displayChannel) => channel);
        }


        /// <summary>
        /// Remove a channel from the list.
        /// </summary>
        /// <param name="channel"></param>
        public bool Remove(DisplayChannel channel)
        {
            return _channels.TryRemove(channel.ChannelId, out _);
        }

        /// <summary>
        /// Get all channels.
        /// </summary>
        /// <returns></returns>
        public IList<DisplayChannel> GetChannels()
        {
            return _channels.Values.ToList();
        }


        /// <summary>
        /// Get one channel by channel Id.
        /// </summary>
        /// <returns></returns>
        public DisplayChannel GetChannel(string channelId)
        {
            if (_channels.TryGetValue(channelId, out DisplayChannel channel))
            {
                return channel;
            }

            return null;
        }
    }
}