ConversationConversion.cs

using System.Linq;

namespace SlackNet.Bot;

static class ConversationConversion
{
    public static Hub ToHub(this Conversation conversation) =>
        conversation.IsIm
            ? (Hub)conversation.ToIm()
            : conversation.ToChannel();
        
    public static Channel ToChannel(this Conversation conversation) =>
        CopyHubProperties(conversation, new Channel
            {
                Name = conversation.Name,
                Creator = conversation.Creator,
                IsArchived = conversation.IsArchived,
                Topic = conversation.Topic,
                Purpose = conversation.Topic
            });

    public static Im ToIm(this Conversation conversation) =>
        CopyHubProperties(conversation, new Im
            {
                User = conversation.User,
                IsUserDeleted = conversation.IsUserDeleted
            });

    private static THub CopyHubProperties<THub>(Conversation conversation, THub hub)
        where THub : Hub
    {
        hub.Id = conversation.Id;
        hub.IsIm = conversation.IsIm;
        hub.IsChannel = conversation.IsChannel;
        hub.IsGroup = conversation.IsGroup;
        hub.IsMpim = conversation.IsMpim;
        hub.IsOrgShared = conversation.IsOrgShared;
        hub.Created = conversation.Created;
        hub.Members = conversation.Members.ToArray();
        hub.LastRead = conversation.LastRead;
        hub.Latest = conversation.Latest;
        hub.UnreadCount = conversation.UnreadCount;
        hub.UnreadCountDisplay = conversation.UnreadCountDisplay;
        hub.IsGeneral = conversation.IsGeneral;
        hub.IsMember = conversation.IsMember;
        return hub;
    }
}