Add support for temporary bans

Signed-off-by: Octol1ttle <l1ttleofficial@outlook.com>

Services/GuildUpdateService.cs

@@ -0,0 +1,41 @@
+using Boyfriend.Services.Data;
+using Microsoft.Extensions.Hosting;
+using Remora.Discord.API.Abstractions.Rest;
+using Remora.Rest.Core;
+
+namespace Boyfriend.Services;
+
+public class GuildUpdateService : BackgroundService {
+    private readonly GuildDataService     _dataService;
+    private readonly IDiscordRestGuildAPI _guildApi;
+
+    public GuildUpdateService(GuildDataService dataService, IDiscordRestGuildAPI guildApi) {
+        _dataService = dataService;
+        _guildApi = guildApi;
+    }
+
+    protected override async Task ExecuteAsync(CancellationToken ct) {
+        using var timer = new PeriodicTimer(TimeSpan.FromSeconds(1));
+        var tasks = new List<Task>();
+
+        while (await timer.WaitForNextTickAsync(ct)) {
+            foreach (var id in _dataService.GetGuildIds())
+                tasks.Add(TickGuildAsync(id, ct));
+
+            await Task.WhenAll(tasks);
+            tasks.Clear();
+        }
+    }
+
+    private async Task TickGuildAsync(Snowflake guildId, CancellationToken ct = default) {
+        var data = await _dataService.GetData(guildId, ct);
+        Messages.Culture = data.Culture;
+
+        foreach (var memberData in data.MemberData.Values)
+            if (DateTimeOffset.UtcNow > memberData.BannedUntil) {
+                _ = _guildApi.RemoveGuildBanAsync(
+                    guildId, memberData.Id.ToDiscordSnowflake(), Messages.PunishmentExpired.EncodeHeader(), ct);
+                memberData.BannedUntil = null;
+            }
+    }
+}