using System;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using Jint.Native;
using Jint.Runtime;

namespace Jint.Repl
{
    class Program
    {
        static void Main(string[] args)
        {
            var engine = new Engine(cfg => cfg.AllowClr())
                .SetValue("print", new Action<object>(Console.WriteLine))
            ;

            var filename = args.Length > 0 ? args[0] : "";
            if (!String.IsNullOrEmpty(filename))
            {
                if (!File.Exists(filename))
                {
                    Console.WriteLine("Could not find file: {0}", filename);
                }

                var script = File.ReadAllText(filename);
                var result = engine.GetValue(engine.Execute(script).GetCompletionValue());
                return;
            }

            Assembly assembly = Assembly.GetExecutingAssembly();
            FileVersionInfo fvi = FileVersionInfo.GetVersionInfo(assembly.Location);
            string version = fvi.FileVersion;

            Console.WriteLine("Welcome to Jint ({0})", version);
            Console.WriteLine("Type 'exit' to leave, 'print()' to write on the console.");
            Console.WriteLine();

            var defaultColor = Console.ForegroundColor;
            while (true)
            {
                Console.ForegroundColor = defaultColor;
                Console.Write("jint> ");
                var input = Console.ReadLine();
                if (input == "exit")
                {
                    return;
                }

                try
                {
                    var result = engine.GetValue(engine.Execute(input).GetCompletionValue());
                    if (result.Type != Types.None && result.Type != Types.Null && result.Type != Types.Undefined)
                    {
                        var str = TypeConverter.ToString(engine.Json.Stringify(engine.Json, Arguments.From(result, Undefined.Instance, "  ")));
                        Console.WriteLine("=> {0}", str);
                    }
                }
                catch (JavaScriptException je)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine(je.ToString());
                }
                catch (Exception e)
                {
                    Console.ForegroundColor = ConsoleColor.Red;
                    Console.WriteLine(e.Message);
                }
                
            }
        }
    }
}