using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Discord.Commands;

namespace Geekbot.net.Modules
{
    public class Help : ModuleBase
    {
        private readonly CommandService commands;

        public Help(CommandService commands)
        {
            this.commands = commands;
        }

        [Command("help", RunMode = RunMode.Async)]
        [Summary("List all Commands")]
        public async Task GetHelp()
        {
            var sb = new StringBuilder();
            sb.AppendLine("```");
            sb.AppendLine("**Geekbot Command list**");
            sb.AppendLine("");
            sb.AppendLine(tp("Name", 15) + tp("Parameters", 19) + "Description");
            foreach (var cmd in commands.Commands)
            {
                var param = string.Join(", !", cmd.Aliases);
                if (!param.Contains("admin"))
                    if (cmd.Parameters.Any())
                        sb.AppendLine(tp(param, 15) +
                                      tp(string.Join(" ", cmd.Parameters.Select(e => e.Summary)), 19) +
                                      cmd.Summary);
                    else
                        sb.AppendLine(tp(param, 34) + cmd.Summary);
            }
            sb.AppendLine("```");
            var dm = await Context.User.GetOrCreateDMChannelAsync();
            await dm.SendMessageAsync(sb.ToString());
        }

        // Table Padding, short function name because of many usages
        private string tp(string text, int shouldHave)
        {
            return text.PadRight(shouldHave);
        }
    }
}