public class Node : INode
    {
        public string Name { get; set; }
        public string Id { get; set; }
    }

    public class Stat : Node, IStat
    {
        public bool IsPrimaryStat { get; set; }
        public int Value { get; set; }
    }

    public class Player : Node, IPlayer
    {
        public IEnumerable<IStat> Stats { get; set; }

        public int Speed
        {
            get
            {
                var baseSpeed = 10;
                var agility = Stats.First(x => x.Name == "Dex").Value;

                return baseSpeed + agility;
            }
        }

        public int HP { get { return Stats.First(x => x.Name == "Hp").Value; } }

        public IEnumerable<IWeapon> Inventory { get; set; }
        public IWeapon Weapon { get; set; }

        public void Attack(IPlayer enemy)
        {
            var damage = Weapon.CalculateDamage(this);

            enemy.ReduceHealth(damage);
        }

        public void ReduceHealth(int damage)
        {
            var hpStat = Stats.First(x => x.Name == "Hp");

            hpStat.Value -= damage;

            if (hpStat.Value <= 0)
            {
                //trigger death;
            }
        }
    }

    public class Enemy : Player, IEnemy
    {

    }

    public class Weapon : Node, IWeapon
    {
        public int Damage { get; set; }
        public int Price { get; set; }
        public int SortOrder { get; set; }

        public Weapon(int damage, int price, int sortOrder)
        {
            Damage = damage;
            Price = price;
            SortOrder = sortOrder;
        }

        public int CalculateDamage(IPlayer attacker)
        {
            var baseDamage = CalculateBaseDamage(attacker);
            var customDamage = CalculateCustomDamage(attacker);

            return baseDamage + customDamage;
        }

        public virtual int CalculateCustomDamage(IPlayer attacker)
        {
            return 0;
        }

        public virtual int CalculateBaseDamage(IPlayer attacker)
        {
            var primaryStat = attacker.Stats.First(s => s.IsPrimaryStat);
            var damage = Damage * primaryStat.Value;

            return damage;
        }
    }

    public class Dagger : Weapon, IDagger
    {
        public Dagger(int damage, int price)
            : base(damage, price, 10)

        {
        }
        public override int CalculateCustomDamage(IPlayer attacker)
        {
            //Dagger pierce 20%

            var pierceDamage = CalculateBaseDamage(attacker) * 20 / 100;

            return pierceDamage;
        }
    }

    public class Staff : Weapon, IStaff
    {
        public Staff(int damage, int price)
            : base(damage, price, 20)
        {
        }


        public override int CalculateCustomDamage(IPlayer attacker)
        {
            return -5;
        }
    }
}