using System;

using System.Collections.Generic;

using Cfg.Net;

using Cfg.Net.Contracts;

using System.Linq;

public class Program {

    public static string GetCfg() {

        return @"

        <cfg address='1009 Broad St.'>

            <rooms>

                <add name='Living' maximum-occupancy='12' />

                <add name='Kitchen' maximum-occupancy='8' />

                <add name='Bathroom' maximum-occupancy='2' />

            </rooms>

        </cfg>

        ";

    }

    public static void Main() {

        // without the modifier

        var cfg = new Home(GetCfg());

        Console.WriteLine("There are {0} errors.", cfg.Errors().Length);

        Console.WriteLine("There are {0} rooms.", cfg.Rooms.Count);

        Console.WriteLine("Before, this home can fit {0} people.", cfg.Rooms.Select(r=>r.MaximumOccupancy).Sum());

        Console.WriteLine("---");

        // with the modifier

        cfg = new Home(GetCfg(), new Multiplier(2));

        Console.WriteLine("Now, this home can fit {0} people.", cfg.Rooms.Select(r=>r.MaximumOccupancy).Sum());

    }

    class Home : CfgNode {

        public Home(string cfg, params IDependency[] dependencies):base(dependencies){

            Load(cfg);

        }

        [Cfg]

        public string Address {get;set;}

        [Cfg]

        public List<Room> Rooms {get; set;}

    }

    class Room : CfgNode {

        [Cfg]

        public string Name {get; set;}

        [Cfg]

        public int MaximumOccupancy {get; set;}

    }

    class Multiplier : ICustomizer {

        private readonly int _multiplier;

        public Multiplier(int multiplier){

            _multiplier = multiplier;

        }

        public void Customize(string collection, INode node, IDictionary<string,string> parameters, ILogger logger){

            if(collection != "rooms")

                return;

            IAttribute maximumOccupancy;

​

​

            if(node.TryAttribute("maximum-occupancy", out maximumOccupancy)){

                int current;

                if(int.TryParse(maximumOccupancy.Value.ToString(), out current)){

                    maximumOccupancy.Value = current * _multiplier;

                }

            }

        }

        public void Customize(INode root, IDictionary<string,string> parameters, ILogger logger){}

    }

}