using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Design_Pattern
{
    public class Decorator : IExecute
    {
        void IExecute.Execute()
        {
            Console.WriteLine("装饰者模式执行......");
            Person person = new Person();
            // 定义一个镶嵌了绿宝石的法杖
            IDecorator GreenStaff = new GreenGemStone(new Staff());
            person.SetWeapon(GreenStaff);
            person.UseWeapon();

            // 定义一个镶嵌了红宝石的法杖
            IDecorator RedStaff = new RedGemStone(new Staff());
            person.SetWeapon(RedStaff);
            person.UseWeapon();
        }
    }

    /// <summary>
    /// 友情出演 人 类
    /// </summary>
    public class Person
    {
        IDecorator m_Weapon;

        public void SetWeapon(IDecorator weapon)
        {
            m_Weapon = weapon;
        }

        public void UseWeapon()
        {
            m_Weapon.Attack();
        }
    }

    /// <summary>
    /// 武器接口
    /// </summary>
    public interface IDecorator
    {
        void Attack();
    }

    /// <summary>
    /// 法杖类（被装饰者）
    /// </summary>
    public class Staff : IDecorator
    {
        public void Attack()
        {
            Console.WriteLine("法杖进行攻击，普通伤害");
        }
    }

    /*-------------------- 以下是装饰类 --------------------*/

    /// <summary>
    /// 宝石装饰抽象类
    /// </summary>
    public abstract class GemStoneDecorator : IDecorator
    {
        IDecorator m_Weapon;

        // 实现接口
        public virtual void Attack()
        {
            m_Weapon.Attack();
        }

        public GemStoneDecorator(IDecorator weapon)
        {
            m_Weapon = weapon;
        }
    }

    /// <summary>
    /// 红宝石类（具体装饰类），增加攻击效果：增加眩晕效果
    /// </summary>
    public class RedGemStone : GemStoneDecorator
    {
        public override void Attack()
        {
            base.Attack();
            Console.WriteLine("镶嵌了红宝石的武器进行攻击，造成眩晕效果");
        }

        public RedGemStone(IDecorator weapon) : base(weapon) { }
    }

    /// <summary>
    /// 绿宝石类（具体装饰类），增加攻击效果：增加降速效果
    /// </summary>
    public class GreenGemStone : GemStoneDecorator
    {
        public override void Attack()
        {
            base.Attack();
            Console.WriteLine("镶嵌了绿宝石的武器进行攻击，造成降速效果");
        }

        public GreenGemStone(IDecorator weapon) : base(weapon) { }
    }
}