archived-discord-bot/CompatBot/Commands/Attributes/LimitedToOfftopicChannel.cs

using System;
using System.Linq;
using System.Threading.Tasks;
using CompatBot.EventHandlers;
using CompatBot.Utils;
using DSharpPlus.CommandsNext;
using DSharpPlus.CommandsNext.Attributes;
using DSharpPlus.Entities;

namespace CompatBot.Commands.Attributes;

[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class, Inherited = false)]
internal class LimitedToOfftopicChannel: CheckBaseAttribute
{
	public override async Task<bool> ExecuteCheckAsync(CommandContext ctx, bool help)
	{
		if (help || LimitedToSpamChannel.IsSpamChannel(ctx.Channel) || IsOfftopicChannel(ctx.Channel))
			return true;

		if (ctx.Command is null)
			return false;

		try
		{
			var msgList = await ctx.Channel.GetMessagesCachedAsync(10).ConfigureAwait(false);
			if (msgList.Any(m => m.Author.IsCurrent
			                     && m.Content is string s
			                     && s.Contains(ctx.Command.QualifiedName, StringComparison.InvariantCultureIgnoreCase)))
			{
				await ctx.ReactWithAsync(Config.Reactions.Failure).ConfigureAwait(false);
				return false; // we just explained to use #bot-spam or DMs, can't help if people can't read
			}
		}
		catch {}

		await ctx.Channel.SendMessageAsync($"`{ctx.Prefix}{ctx.Command.QualifiedName}` is limited to off-topic channels and DMs").ConfigureAwait(false);
		return false;
	}

	internal static bool IsOfftopicChannel(DiscordChannel channel)
	{
		return channel.Name.Contains("off-topic", StringComparison.InvariantCultureIgnoreCase)
		       || channel.Name.Contains("offtopic", StringComparison.InvariantCultureIgnoreCase);
	}
}