using Telegram.Bot.Types;
using AntiAntiSwearingBot.Commands;

namespace AntiAntiSwearingBot;

public interface IChatCommand
{
    string Execute(CommandString cmd, Update messageEventArgs);
}

public class ChatCommandRouter
{
    string Username { get; }
    Dictionary<string, IChatCommand> Commands { get; }

    public ChatCommandRouter(string username)
    {
        Username = username;
        Commands = new Dictionary<string, IChatCommand>();
    }

    public string Execute(object sender, Update args)
    {
        var text = args.Message.Text;
        if (CommandString.TryParse(text, out var cmd))
        {
            if (cmd.Username != null && cmd.Username != Username)
                return null;
            if (Commands.ContainsKey(cmd.Command))
                return Commands[cmd.Command].Execute(cmd, args);
        }
        return null;
    }

    public void Add(IChatCommand c, params string[] cmds)
    {
        foreach (var cmd in cmds)
        {
            if (Commands.ContainsKey(cmd))
                throw new ArgumentException($"collision for {cmd}, commands {Commands[cmd].GetType()} and {c.GetType()}");
            Commands[cmd] = c;
        }
    }
}