using System;

using PowerArgs;
using ScriptCs.Command;

namespace ScriptCs
{
    internal static class Program
    {
        private static int Main(string[] args) 
        {
            var commandArgs = ParseArguments(args) ?? new ScriptCsArgs { Repl = true };

            var compositionRoot = new CompositionRoot(commandArgs);
            compositionRoot.Initialize();

            var logger = compositionRoot.GetLogger();
            logger.Debug("Creating ScriptServiceRoot");
           
            var scriptServiceRoot = compositionRoot.GetServiceRoot();

            var commandFactory = new CommandFactory(scriptServiceRoot);
            var command = commandFactory.CreateCommand(commandArgs);
            var result = command.Execute();

            return result == CommandResult.Success ? 0 : -1;
        }

        private static ScriptCsArgs ParseArguments(string[] args)
        {
            const string UnexpectedArgumentMessage = "Unexpected Argument: ";

            if (args.Length <= 0) return null;

            try
            {
                return Args.Parse<ScriptCsArgs>(args);
            }
            catch (ArgException ex)
            {
                if (ex.Message.StartsWith(UnexpectedArgumentMessage))
                {
                    var token = ex.Message.Substring(UnexpectedArgumentMessage.Length);
                    Console.WriteLine("Parameter \"{0}\" is not supported!", token);
                }
                else
                {
                    Console.WriteLine(ex.Message);
                }
            }

            return new ScriptCsArgs();
        }
    }
}