Initial split of the modules

NadekoBot.Core/Modules/Administration/TimeZoneCommands.cs

@@ -0,0 +1,65 @@
+using Discord;
+using Discord.Commands;
+using Discord.WebSocket;
+using NadekoBot.Extensions;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using NadekoBot.Common.Attributes;
+using NadekoBot.Modules.Administration.Services;
+
+namespace NadekoBot.Modules.Administration
+{
+    public partial class Administration
+    {
+        [Group]
+        public class TimeZoneCommands : NadekoSubmodule<GuildTimezoneService>
+        {
+            [NadekoCommand, Usage, Description, Aliases]
+            [RequireContext(ContextType.Guild)]
+            public async Task Timezones(int page = 1)
+            {
+                page--;
+
+                if (page < 0 || page > 20)
+                    return;
+
+                var timezones = TimeZoneInfo.GetSystemTimeZones()
+                    .OrderBy(x => x.BaseUtcOffset)
+                    .ToArray();
+                var timezonesPerPage = 20;
+
+                await Context.Channel.SendPaginatedConfirmAsync((DiscordSocketClient)Context.Client, page, 
+                    (curPage) => new EmbedBuilder()
+                        .WithOkColor()
+                        .WithTitle(GetText("timezones_available"))
+                        .WithDescription(string.Join("\n", timezones.Skip(curPage * timezonesPerPage).Take(timezonesPerPage).Select(x => $"`{x.Id,-25}` {(x.BaseUtcOffset < TimeSpan.Zero? "-" : "+")}{x.BaseUtcOffset:hhmm}"))),
+                    timezones.Length / timezonesPerPage);
+            }
+
+            [NadekoCommand, Usage, Description, Aliases]
+            [RequireContext(ContextType.Guild)]
+            public async Task Timezone([Remainder] string id = null)
+            {
+                if (string.IsNullOrWhiteSpace(id))
+                {
+                    await ReplyConfirmLocalized("timezone_guild", _service.GetTimeZoneOrUtc(Context.Guild.Id)).ConfigureAwait(false);
+                    return;
+                }
+
+                TimeZoneInfo tz;
+                try { tz = TimeZoneInfo.FindSystemTimeZoneById(id); } catch { tz = null; }
+
+                _service.SetTimeZone(Context.Guild.Id, tz);
+
+                if (tz == null)
+                {
+                    await ReplyErrorLocalized("timezone_not_found").ConfigureAwait(false);
+                    return;
+                }
+
+                await Context.Channel.SendConfirmAsync(tz.ToString()).ConfigureAwait(false);
+            }
+        }
+    }
+}