SupportChild/SupportChild/Commands/MoveCommand.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using DSharpPlus.CommandsNext;
using DSharpPlus.CommandsNext.Attributes;
using DSharpPlus.Entities;
using DSharpPlus.Exceptions;
using Microsoft.Extensions.Logging;

namespace SupportChild.Commands
{
    public class MoveCommand : BaseCommandModule
    {
        [Command("move")]
        [Description("Move a ticket to another category.")]
        public async Task OnExecute(CommandContext command, [RemainingText] string commandArgs)
        {
            // Check if the user has permission to use this command.
            if (!Config.HasPermission(command.Member, "move"))
            {
                DiscordEmbed error = new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "You do not have permission to use this command."
                };
                await command.RespondAsync(error);
                command.Client.Logger.Log(LogLevel.Information, "User tried to use the move command but did not have permission.");
                return;
            }

			// Check if ticket exists in the database
			if (!Database.TryGetOpenTicket(command.Channel.Id, out Database.Ticket ticket))
			{
				DiscordEmbed error = new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = "This channel is not a ticket."
				};
				await command.RespondAsync(error);
				return;
			}

			if (string.IsNullOrEmpty(command.RawArgumentString))
			{
				DiscordEmbed error = new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = "Error: No category provided."
				};
				await command.RespondAsync(error);
				return;
			}

			IReadOnlyList<DiscordChannel> channels = await command.Guild.GetChannelsAsync();
			IEnumerable<DiscordChannel> categories = channels.Where(x => x.IsCategory);
			DiscordChannel category = categories.FirstOrDefault(x => x.Name.StartsWith(command.RawArgumentString.Trim(), StringComparison.OrdinalIgnoreCase));

			if (category == null)
			{
				DiscordEmbed error = new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = "Error: Could not find a category by that name."
				};
				await command.RespondAsync(error);
				return;
			}

			if (command.Channel.Id == category.Id)
			{
				DiscordEmbed error = new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = "Error: The ticket is already in that category."
				};
				await command.RespondAsync(error);
				return;
			}

			try
			{
				await command.Channel.ModifyAsync(modifiedAttributes => modifiedAttributes.Parent = category);
			}
			catch (UnauthorizedException)
			{
				DiscordEmbed error = new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = "Error: Not authorized to move this ticket to that category."
				};
				await command.RespondAsync(error);
				return;
			}

			DiscordEmbed feedback = new DiscordEmbedBuilder
			{
				Color = DiscordColor.Green,
				Description = "Ticket was moved to " + category.Mention
			};
			await command.RespondAsync(feedback);
		}
    }
}