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Catalogger.Backend/Bot/Responders/GuildCreateResponder.cs

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+using System.Diagnostics;
+using Catalogger.Backend.Cache;
+using Catalogger.Backend.Database;
+using Catalogger.Backend.Database.Models;
+using Catalogger.Backend.Extensions;
+using Remora.Discord.API.Abstractions.Gateway.Events;
+using Remora.Discord.Gateway.Responders;
+using Remora.Results;
+
+namespace Catalogger.Backend.Bot.Responders;
+
+public class GuildCreateResponder(ILogger logger, DatabaseContext db, ChannelCacheService channelCache)
+    : IResponder<IGuildCreate>
+{
+    private readonly ILogger _logger = logger.ForContext<GuildCreateResponder>();
+
+    public async Task<Result> RespondAsync(IGuildCreate evt, CancellationToken ct = default)
+    {
+        ulong guildId;
+        string? guildName = null;
+        if (evt.Guild.TryPickT0(out var guild, out _))
+        {
+            _logger.Verbose("Received guild create for available guild {GuildId} ({Name})", guild.ID, guild.Name);
+            guildId = guild.ID.ToUlong();
+            guildName = guild.Name;
+
+            foreach (var c in guild.Channels) channelCache.AddChannel(c, guild.ID);
+        }
+        else if (evt.Guild.TryPickT1(out var unavailableGuild, out _))
+        {
+            _logger.Verbose("Received guild create for unavailable guild {GuildId}", unavailableGuild.ID);
+            guildId = unavailableGuild.ID.ToUlong();
+        }
+        else throw new UnreachableException();
+
+        var tx = await db.Database.BeginTransactionAsync(ct);
+        if (await db.Guilds.FindAsync([guildId], ct) != null) return Result.Success;
+
+        db.Add(new Guild
+        {
+            Id = guildId
+        });
+        await db.SaveChangesAsync(ct);
+        await tx.CommitAsync(ct);
+
+        _logger.Information("Joined new guild {GuildId} ({Name})", guildId, guildName);
+        return Result.Success;
+    }
+}