using System;
using System.Collections.Generic;
using System.IO;
using System.Runtime.InteropServices;
namespace ReflectiveConfiguration
{
    public abstract class Configuration
    {
        Dictionary<String, ConfigurationSection> sections = new Dictionary<string, ConfigurationSection>();

        public Configuration()
        {
            ConfigurationSection defaultSection = this[""];
        }

        public Configuration(String path){
            LoadFrom(path);
        }

        public ConfigurationSection this[string name] {
            get {
                if (sections.ContainsKey(name))
                {
                    return sections[name];
                }
                return createSection(name);
            }
        }

        public Dictionary<String,ConfigurationSection>.KeyCollection Keys {
            get { return this.sections.Keys; }
        }

        public void LoadFrom(String path)
        {
            using (FileStream stream = new FileStream(path, FileMode.Open, FileAccess.Read))
            {
                LoadFrom(stream);
            }
        }
        public void SaveTo(String path)
        {
            using (FileStream stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write))
            {
                SaveTo(stream);
            }
        }


        public abstract ConfigurationSection createSection(String name);

        public abstract void LoadFrom(Stream stream);
        public abstract void SaveTo(Stream stream);
    }
}