using System;
using System.Collections.Generic;
using System.Linq;

namespace doglist
{

    public class DogClass
    {
        private static int iddog;
        public int Iddog { get; set; }
        public string Name { get; set; }
        public string Breed { get; set; }
        public bool IsBitch { get; set; }
        public int Age { get; set; }

        public DogClass()
        {
            Iddog = iddog++;
        }

        // static constructor to set isddog
        static DogClass()
        {
            iddog = 0;
        }

        public override string ToString()
        {
            return Name+'('+Iddog+") "+Breed + (IsBitch ?" B ":" D ") + "Age="+Age;
        }
    }
   
    public class DogList
    {
        private readonly List<DogClass> dogs;
        public List<DogClass> Dogs
        {
            get { return dogs; }
        }

        public int Count
        {
            get
            {
                return dogs.Count;
            }
        }

        public DogClass this[int i]
        {
            get
            {
                return dogs[i];
            }
        }

        public void AddDog(DogClass dog)
        {
            dogs.Add(dog);
        }

        public void RemoveDog(DogClass dog)
        {
            dogs.Remove(dog);
        }

        public DogClass FindDog(int iddog)
        {
            return dogs.FirstOrDefault(Dog => Dog.Iddog == iddog);
        }

        public DogList()
        {
            dogs = new List<DogClass> {};
            dogs.Capacity = 20;
        }

        public void ClearList()
        {
            dogs.Clear();
        }

        // LINQ version of
        // foreach (var d in dogs)
        //     yield return d;
        public IEnumerator<DogClass> GetEnumerator()
        {
            return ((IEnumerable<DogClass>) dogs).GetEnumerator();
        }

        public int MySortFunction(DogClass dog1, DogClass dog2)
        {
            return dog1.Name.CompareTo(dog2.Name);
        }

        public void Sort()
        {
            dogs.Sort(MySortFunction);
        }
    } 
 


    class Program
    {
        static void Main(string[] args)
        {
            var dogs = new DogList();
            dogs.AddDog(new DogClass(){Name=@"Rufus",Breed="Minature Poodle",IsBitch = false,Age=4});
            dogs.AddDog(new DogClass() {Name = @"Monty", Breed = "Minature Poodle", IsBitch = false,Age=5 });
            dogs.AddDog(new DogClass() { Name = @"Sam", Breed = "Standard Poodle", IsBitch = false,Age=12 });
            dogs.AddDog(new DogClass() { Name = @"Judy", Breed = "Afghanistan", IsBitch = true,Age=3 });

            var dog = dogs.FindDog(2);
            Console.WriteLine("Dog 2 is {0}",dog);
            Console.WriteLine("There are {0} dogs",dogs.Count);

            Console.WriteLine("Dog[1] is {0}", dogs[1]);
            //dogs.Dogs.RemoveAll(adog => adog.IsBitch == false);

            var averagAge = 0;
            foreach (var adog in dogs)
            {
                averagAge += adog.Age;
            }
            Console.WriteLine("Average age is {0}", averagAge/dogs.Count);

            dogs.Sort();

            Console.WriteLine("Male Dogs in alphaberic order by name");
            foreach (var dog1 in dogs)
            {
                if (!dog1.IsBitch)
                {
                    Console.WriteLine(dog1);
                }
            }
            Console.ReadKey();
        }
    }
}