SupportChild/Commands/AssignCommand.cs

using System;
using System.Threading.Tasks;
using DSharpPlus.Entities;
using DSharpPlus.Exceptions;
using DSharpPlus.SlashCommands;
using DSharpPlus.SlashCommands.Attributes;

namespace SupportChild.Commands;

public class AssignCommand : ApplicationCommandModule
{
    [SlashRequireGuild]
    [SlashCommand("assign", "Assigns a staff member to this ticket.")]
    public async Task OnExecute(InteractionContext command, [Option("User", "(Optional) User to assign to this ticket.")] DiscordUser user = null)
    {
        DiscordMember member = null;
        try
        {
            member = user == null ? command.Member : await command.Guild.GetMemberAsync(user.Id);

            if (member == null)
            {
                await command.CreateResponseAsync(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "Could not find that user in this server."
                }, true);
                return;
            }
        }
        catch (Exception)
        {
            await command.CreateResponseAsync(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Red,
                Description = "Could not find that user in this server."
            }, true);
            return;
        }

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

        if (!Database.IsStaff(member.Id))
        {
            await command.CreateResponseAsync(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Red,
                Description = "Error: User is not registered as staff."
            }, true);
            return;
        }

        if (!Database.AssignStaff(ticket, member.Id))
        {
            await command.CreateResponseAsync(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Red,
                Description = "Error: Failed to assign " + member.Mention + " to ticket."
            }, true);
            return;
        }

        await command.CreateResponseAsync(new DiscordEmbedBuilder
        {
            Color = DiscordColor.Green,
            Description = "Assigned " + member.Mention + " to ticket."
        });

        if (Config.assignmentNotifications)
        {
            try
            {
                await member.SendMessageAsync(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Green,
                    Description = "You have been assigned to a support ticket: " + command.Channel.Mention
                });
            }
            catch (UnauthorizedException) { }
        }

        // Log it if the log channel exists
        DiscordChannel logChannel = command.Guild.GetChannel(Config.logChannel);
        if (logChannel != null)
        {
            await logChannel.SendMessageAsync(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Green,
                Description = member.Mention + " was assigned to " + command.Channel.Mention + " by " + command.Member.Mention + "."
            });
        }
    }
}