using System;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Discord.Commands;
using Neo.IronLua;
using NLog;

namespace ChaosBot.Services.ProgrammingLanguageInterpreter
{
    internal class LuaProgrammingLanguageInterpreter : IProgrammingLanguageInterpreter
    {
        private static readonly ILogger Logger = Program.GetLogger();
        private readonly StringBuilder _outputBuilder = new StringBuilder();
        private Lua _lua;
        
        public string Interpret(SocketCommandContext context, string content, string command)
        {
            using (_lua = new Lua())
            {
                // This needs to be dynamic if we want to call
                // functions from within the lua environment
                // This is a runtime type check
                dynamic env = _lua.CreateEnvironment();

                ParamsDelegate printDel = Print;
                env.print = printDel;

                env.context = context;

                string code = content;

                env.dochunk(code, $"{command}.lua");

                return _outputBuilder.ToString();
            }
        }

        public void StopExecution()
        {
            _lua.Dispose();
        }

        private delegate void ParamsDelegate(params object[] parameters);

        private void Print(params object[] parameters)
        {
            string str = string.Join(" ", from param in parameters select param == null ? string.Empty : param.ToString());

            _outputBuilder.Append(str);
        }
    }
}