using System.Reflection;
using System.Text.RegularExpressions;


namespace CLre_server.Tweaks.Chat
{
    public class Attributes
    {
        
    }
    
    [System.AttributeUsage(System.AttributeTargets.Method)]
    public class ChatCommandAttribute : System.Attribute
    {
        public readonly string Name;
        private readonly Regex _pattern;
        private readonly Regex _usernamePattern;

        public ChatCommandAttribute(string name, string pattern,
            string usernamePattern = null,
            RegexOptions options = RegexOptions.Compiled | RegexOptions.IgnoreCase)
        {
            this.Name = name;
            this._pattern = new Regex(pattern, options);
            this._usernamePattern = usernamePattern == null ? null : new Regex(pattern, options);
            Assembly asm = Assembly.GetCallingAssembly();
            if (!ChatConnectionEngine._assembliesToCheck.Contains(asm))
            {
                ChatConnectionEngine._assembliesToCheck.Add(asm);
            }

            if (ChatHandler.IsAuthenticationReady && CLre.Config.chat_commands)
            {
                // Chat system is already started
                // TODO
            }
        }

        public Regex GetPattern()
        {
            return _pattern;
        }

        public Match RegexMatch(string sender, string message)
        {
            if (this._usernamePattern != null)
            {
                if (this._usernamePattern.IsMatch(sender))
                {
                    return _pattern.Match(message);
                }
            }
            else
            {
                return _pattern.Match(message);
            }
            return System.Text.RegularExpressions.Match.Empty;
        }
    }
}