SupportChild/Commands/SayCommand.cs

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

namespace SupportChild.Commands;

public class SayCommand : ApplicationCommandModule
{
    [SlashRequireGuild]
    [SlashCommand("say", "Prints a message with information from staff. Use without identifier to list all identifiers.")]
    public async Task OnExecute(InteractionContext command, [Option("Identifier", "(Optional) The identifier word to summon a message.")] string identifier = null)
    {
        // Print list of all messages if no identifier is provided
        if (identifier == null)
        {
            List<Database.Message> messages = Database.GetAllMessages();
            if (!messages.Any())
            {
                await command.CreateResponseAsync(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "There are no messages registered."
                }, true);
                return;
            }

            List<string> listItems = new List<string>();
            foreach (Database.Message message in messages)
            {
                listItems.Add("**" + message.identifier + "** Added by <@" + message.userID + ">\n");
            }

            LinkedList<string> listMessages = Utilities.ParseListIntoMessages(listItems);
            foreach (string listMessage in listMessages)
            {
                await command.CreateResponseAsync(new DiscordEmbedBuilder
                {
                    Title = "Available messages: ",
                    Color = DiscordColor.Green,
                    Description = listMessage
                }, true);
            }
        }
        // Print specific message
        else
        {
            if (!Database.TryGetMessage(identifier.ToLower(), out Database.Message message))
            {
                await command.CreateResponseAsync(new DiscordEmbedBuilder
                {
                    Color = DiscordColor.Red,
                    Description = "There is no message with that identifier."
                }, true);
                return;
            }

            await command.CreateResponseAsync(new DiscordEmbedBuilder
            {
                Color = DiscordColor.Cyan,
                Description = message.message.Replace("\\n", "\n")
            });
        }
    }
}