using System;
using System.Collections.Generic;

namespace CompositePatternDemo
{
    class Program
    {
        static void Main(string[] args)
        {
            IStoreElement myStore = generate();
            Console.WriteLine(myStore.ListOut());
        }

        static IStoreElement generate()
        {
            IStoreElement subcat1 = new StoreCategory("Foods",
                new List<IStoreElement>
                {
                    new StoreItem("Bread"),
                    new StoreItem("Veggies"),
                    new StoreItem("Cheese"),
                    new StoreCategory("Drinks",
                    new List<IStoreElement>
                    {
                        new StoreItem("Juice"),
                        new StoreItem("Mineral water"),
                    })
                });
            IStoreElement subcat2 = new StoreCategory("Chems",
                new List<IStoreElement>
                {
                    new StoreItem("Toothpaste"),
                    new StoreItem("Shampoo"),
                    new StoreItem("Soap")
                });
            IStoreElement item1 = new StoreItem("Painkillers");
            IStoreElement item2 = new StoreItem("Lottery ticket");
            IStoreElement result = new StoreCategory("Local shop",
                new List<IStoreElement>
                {
                    subcat1,
                    subcat2,
                    item1,
                    item2
                });
            return result;
        }
    }

    public interface IStoreElement
    {
        string Name { get; set; }
        string ListOut(int indent = 0);
    }

    public class StoreItem : IStoreElement
    {
        public string Name { get; set; }

        public StoreItem(string _name)
        {
            Name = _name;
        }

        public string ListOut(int indent = 0)
        {
            string result = "";
            for (int i = indent; i > 0; i--)
            {
                result += "-";
            }
            result += String.Format("Item: {0}", Name);
            return result;
        }
    }

    public class StoreCategory : IStoreElement
    {
        public string Name { get; set; }
        private IList<IStoreElement> members;

        public StoreCategory(string _name, IList<IStoreElement> _members)
        {
            Name = _name;
            members = _members;
        }

        public string ListOut(int indent = 0)
        {
            string result = "";
            for (int i = indent; i > 0; i--)
            {
                result += "-";
            }
            result += String.Format("Category: {0}", Name);
            foreach (IStoreElement element in members)
            {
                result += String.Format("\n{0}", element.ListOut(indent + 1));
            }
            return result;
        }
    }
}