Initial split of the modules

NadekoBot.Core/Modules/Administration/Services/AutoAssignRoleService.cs

@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Discord.WebSocket;
+using NadekoBot.Services;
+using NadekoBot.Services.Database.Models;
+using NLog;
+
+namespace NadekoBot.Modules.Administration.Services
+{
+    public class AutoAssignRoleService : INService
+    {
+        private readonly Logger _log;
+        private readonly DiscordSocketClient _client;
+
+        //guildid/roleid
+        public ConcurrentDictionary<ulong, ulong> AutoAssignedRoles { get; }
+
+        public AutoAssignRoleService(DiscordSocketClient client, IEnumerable<GuildConfig> gcs)
+        {
+            _log = LogManager.GetCurrentClassLogger();
+            _client = client;
+
+            AutoAssignedRoles = new ConcurrentDictionary<ulong, ulong>(
+                gcs.Where(x => x.AutoAssignRoleId != 0)
+                    .ToDictionary(k => k.GuildId, v => v.AutoAssignRoleId));
+
+            _client.UserJoined += (user) =>
+            {
+                var _ = Task.Run(async () =>
+                {
+                    try
+                    {
+                        AutoAssignedRoles.TryGetValue(user.Guild.Id, out ulong roleId);
+
+                        if (roleId == 0)
+                            return;
+
+                        var role = user.Guild.Roles.FirstOrDefault(r => r.Id == roleId);
+
+                        if (role != null)
+                            await user.AddRoleAsync(role).ConfigureAwait(false);
+                    }
+                    catch (Exception ex) { _log.Warn(ex); }
+                });
+                return Task.CompletedTask;
+            };
+        }
+    }
+}