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

namespace Training.DomainClasses
{
    public class PetShop
    {
        private IList<Pet> _petsInTheStore;
        public static IEnumerable<Pet> filter;

        public PetShop(IList<Pet> petsInTheStore)
        {
            this._petsInTheStore = petsInTheStore;
        }

        public IEnumerable<Pet> AllPets()
        {
            foreach (var pet in _petsInTheStore)
            {
                yield return pet;
            }
        }

        public void Add(Pet newPet)
        {
            if (!_petsInTheStore.Contains(newPet))
                _petsInTheStore.Add(newPet);
        }

        public IEnumerable<Pet> AllCats()
        {
            foreach (var pet in _petsInTheStore)
            {
                if (pet.species == Species.Cat) yield return pet;
            }
        }

        public IEnumerable<Pet> AllPetsSortedByName()
        {
            List<Pet> petsSortedByName = new List<Pet>(_petsInTheStore);
            petsSortedByName.Sort((i1, i2) => i1.name.CompareTo(i2.name) );
            return petsSortedByName;
        }

        public IEnumerable<Pet> AllMice()
        {
            return PetsThatSatisfy(p => p.species == Species.Mouse);
        }

        public static IEnumerable<Pet> PetsThatSatisfy(Predicate<Pet> condition)
        {
            foreach (var pet in _petsInTheStore)
            {
                if (condition(pet))
                    yield return pet;
            }
        }

        public IEnumerable<Pet> AllFemalePets()
        {
            return PetsThatSatisfy(p => p.sex == Sex.Female);

        }

        public IEnumerable<Pet> AllCatsOrDogs()
        {
            return PetsThatSatisfy(pet => pet.species.Equals(Species.Dog) || pet.species.Equals(Species.Cat));
        }

        public IEnumerable<Pet> AllPetsButNotMice()
        {
            return PetsThatSatisfy(pet => !pet.species.Equals(Species.Mouse));
        }

        public IEnumerable<Pet> AllPetsBornAfter2010()
        {
            return PetsThatSatisfy(p => p.yearOfBirth > 2010);
        }

        public IEnumerable<Pet> AllDogsBornAfter2010()
        {
            return PetsThatSatisfy(p => p.yearOfBirth > 2010 && p.species.Equals(Species.Dog));
        }

        public IEnumerable<Pet> AllMaleDogs()
        {
            return PetsThatSatisfy(p => p.sex == Sex.Male && p.species.Equals(Species.Dog));

        }

        public IEnumerable<Pet> AllPetsBornAfter2011OrRabbits()
        {
            return PetsThatSatisfy(p => p.yearOfBirth > 2010 || p.species.Equals(Species.Rabbit));
        }
    }
}