SupportChild/Commands/ListCommand.cs

using System.Collections.Generic;
using System.Threading.Tasks;
using DSharpPlus.Entities;
using DSharpPlus.Interactivity;
using DSharpPlus.Interactivity.Extensions;
using DSharpPlus.SlashCommands;
using DSharpPlus.SlashCommands.Attributes;

namespace SupportChild.Commands;

public class ListCommand : ApplicationCommandModule
{
	[SlashRequireGuild]
	[SlashCommand("list", "Lists tickets opened by a user.")]
	public async Task OnExecute(InteractionContext command, [Option("User", "(Optional) The user to get tickets by.")] DiscordUser user = null)
	{
		DiscordUser listUser = user == null ? command.User : user;

		List<DiscordEmbedBuilder> openEmbeds = new List<DiscordEmbedBuilder>();
		if (Database.TryGetOpenTickets(listUser.Id, out List<Database.Ticket> openTickets))
		{
			List<string> listItems = new List<string>();
			foreach (Database.Ticket ticket in openTickets)
			{
				listItems.Add("**" + ticket.DiscordRelativeTime() + ":** <#" + ticket.channelID + ">\n");
			}

			foreach (string message in Utilities.ParseListIntoMessages(listItems))
			{
				openEmbeds.Add(new DiscordEmbedBuilder
				{
					Color = DiscordColor.Green,
					Description = message
				});
			}

			// Add the titles
			for (int i = 0; i < openEmbeds.Count; i++)
			{
				openEmbeds[i].Title = $"Open tickets ({i + 1}/{openEmbeds.Count})";
			}
		}

		List<DiscordEmbedBuilder> closedEmbeds = new List<DiscordEmbedBuilder>();
		if (Database.TryGetClosedTickets(listUser.Id, out List<Database.Ticket> closedTickets))
		{
			List<string> listItems = new List<string>();
			foreach (Database.Ticket ticket in closedTickets)
			{
				listItems.Add("**" + ticket.DiscordRelativeTime() + ":** Ticket " + ticket.id.ToString("00000") + "\n");
			}

			foreach (string message in Utilities.ParseListIntoMessages(listItems))
			{
				closedEmbeds.Add(new DiscordEmbedBuilder
				{
					Color = DiscordColor.Red,
					Description = message
				});
			}

			// Add the titles
			for (int i = 0; i < closedEmbeds.Count; i++)
			{
				closedEmbeds[i].Title = $"Closed tickets ({i + 1}/{closedEmbeds.Count})";
			}
		}

		// Merge the embed lists and add the footers
		List<DiscordEmbedBuilder> embeds = new List<DiscordEmbedBuilder>();
		embeds.AddRange(openEmbeds);
		embeds.AddRange(closedEmbeds);
		for (int i = 0; i < embeds.Count; i++)
		{
			embeds[i].Footer = new DiscordEmbedBuilder.EmbedFooter
			{
				Text = $"Page {i + 1} / {embeds.Count}"
			};
		}

		if (embeds.Count == 0)
		{
			await command.CreateResponseAsync(new DiscordEmbedBuilder
			{
				Color = DiscordColor.Cyan,
				Description = "User does not have any open or closed tickets."
			});
			return;
		}

		List<Page> listPages = new List<Page>();
		foreach (DiscordEmbedBuilder embed in embeds)
		{
			listPages.Add(new Page("", embed));
		}

		await command.Interaction.SendPaginatedResponseAsync(true, command.User, listPages);
	}
}