sharp-chat/SharpChat.SockChat/Commands/MessageDeleteCommand.cs

using SharpChat.Events;
using SharpChat.SockChat.PacketsS2C;
using System.Linq;

namespace SharpChat.SockChat.Commands {
    public class MessageDeleteCommand : ISockChatClientCommand {
        public bool IsMatch(SockChatClientCommandContext ctx) {
            return ctx.NameEquals("delmsg") || (
                ctx.NameEquals("delete")
                && ctx.Args.FirstOrDefault()?.All(char.IsDigit) == true
            );
        }

        public void Dispatch(SockChatClientCommandContext ctx) {
            bool deleteAnyMessage = ctx.User.Permissions.HasFlag(UserPermissions.DeleteAnyMessage);

            if(!deleteAnyMessage && !ctx.User.Permissions.HasFlag(UserPermissions.DeleteOwnMessage)) {
                ctx.Chat.SendTo(ctx.User, new CommandNotAllowedErrorS2CPacket(ctx.Name));
                return;
            }

            string? firstArg = ctx.Args.FirstOrDefault();

            if(string.IsNullOrWhiteSpace(firstArg) || !firstArg.All(char.IsDigit) || !long.TryParse(firstArg, out long eventId)) {
                ctx.Chat.SendTo(ctx.User, new CommandFormatErrorS2CPacket());
                return;
            }

            ChatEventInfo? eventInfo = ctx.Chat.EventStorage.GetEvent(eventId);

            if(eventInfo == null
                || !eventInfo.Type.Equals("msg:add")
                || eventInfo.SenderRank > ctx.User.Rank
                || (!deleteAnyMessage && eventInfo.SenderId != ctx.User.UserId)) {
                ctx.Chat.SendTo(ctx.User, new MessageDeleteNotAllowedErrorS2CPacket());
                return;
            }

            ctx.Chat.Events.Dispatch("msg:delete", eventInfo.ChannelName, ctx.User, new MessageDeleteEventData(eventInfo.Id.ToString()));
        }
    }
}