using System;
using System.Collections.Generic;

namespace Lambdas
{
    class CommandNotFoundException : Exception
    {

    }

    internal class Repl
    {
        readonly Dictionary<string, Action> commands = new Dictionary<string, Action>
        {
            {"1", () => Console.WriteLine("Command 1 executed") },
            {"2", () => Console.WriteLine("Command 2 executed") },
            {"3", () =>
                {
                    var d = new Dictionary<string, string>();
                    Console.WriteLine(d["doron"]);
                }
            },
        };

        public Repl()
        {
        }

        internal void Run()
        {
            while (true)
            {
                try
                {
                    var commandName = InputCommand();
                    var command = FindCommand(commandName);
                    command();
                }
                catch (CommandNotFoundException)
                {
                    Console.WriteLine("Error: Bad command name");
                }
                catch (Exception e)
                {
                    Console.WriteLine($"Error: {e.Message}");
                }
            }
        }

        private Action FindCommand(string commandName)
        {
            // commands[commandName];
            Action command;
            if (commands.TryGetValue(commandName, out command))
            {
                return command;
            }
            else
            {
                throw new CommandNotFoundException();
            }
        }

        private string InputCommand()
        {
            Console.Write("> ");
            return Console.ReadLine();
        }
    }
}