archived-discord-bot/CompatBot/EventHandlers/ThumbnailCacheMonitor.cs

using System.Linq;
using System.Threading.Tasks;
using CompatBot.Database;
using DSharpPlus;
using DSharpPlus.EventArgs;

namespace CompatBot.EventHandlers;

internal static class ThumbnailCacheMonitor
{
    public static async Task OnMessageDeleted(DiscordClient _, MessageDeleteEventArgs args)
    {
        if (args.Channel.Id != Config.ThumbnailSpamId)
            return;

        if (string.IsNullOrEmpty(args.Message.Content))
            return;

        if (!args.Message.Attachments.Any())
            return;

        await using var db = new ThumbnailDb();
        var thumb = db.Thumbnail.FirstOrDefault(i => i.ContentId == args.Message.Content);
        if (thumb is { EmbeddableUrl: { Length: > 0 } url } && args.Message.Attachments.Any(a => a.Url == url))
        {
            thumb.EmbeddableUrl = null;
            await db.SaveChangesAsync(Config.Cts.Token).ConfigureAwait(false);
        }
    }
}