Catalogger.NET/Catalogger.Backend/Bot/Responders/Channels/ChannelDeleteResponder.cs

using Catalogger.Backend.Cache.InMemoryCache;
using Catalogger.Backend.Database;
using Catalogger.Backend.Database.Queries;
using Catalogger.Backend.Extensions;
using Catalogger.Backend.Services;
using Remora.Discord.API.Abstractions.Gateway.Events;
using Remora.Discord.Extensions.Embeds;
using Remora.Discord.Gateway.Responders;
using Remora.Results;

namespace Catalogger.Backend.Bot.Responders.Channels;

public class ChannelDeleteResponder(
    ILogger logger,
    DatabaseContext db,
    ChannelCache channelCache,
    WebhookExecutorService webhookExecutor
) : IResponder<IChannelDelete>
{
    private readonly ILogger _logger = logger.ForContext<ChannelDeleteResponder>();

    public async Task<Result> RespondAsync(IChannelDelete evt, CancellationToken ct = default)
    {
        if (!evt.GuildID.IsDefined())
        {
            _logger.Debug("Deleted channel {ChannelId} is not in a guild", evt.ID);
            return Result.Success;
        }

        if (!channelCache.TryGet(evt.ID, out var channel))
        {
            _logger.Information("Deleted channel {ChannelId} not found in the cache", evt.ID);
            channelCache.Remove(evt.GuildID.OrDefault(), evt.ID, out _);
            return Result.Success;
        }

        var guildConfig = await db.GetGuildAsync(evt.GuildID.Value, ct);
        var embed = new EmbedBuilder()
            .WithTitle("Channel deleted")
            .WithColour(DiscordUtils.Red)
            .WithFooter($"ID: {evt.ID}")
            .WithCurrentTimestamp()
            .WithDescription($"**Name:** {channel.Name.Value}");

        if (
            channel.ParentID.IsDefined(out var parentId)
            && channelCache.TryGet(parentId.Value, out var category)
        )
            embed.Description += $"\n**Category:** {category.Name}";
        else
            embed.Description += "\n**Category:** (none)";

        if (channel.Topic.IsDefined(out var topic))
            embed.AddField("Description", topic);

        webhookExecutor.QueueLog(
            guildConfig,
            LogChannelType.ChannelDelete,
            embed.Build().GetOrThrow()
        );
        return Result.Success;
    }
}