package com.mks.core.discount;

import com.mks.core.member.Grade;
import com.mks.core.member.Member;

public class FixDiscountPolicy implements DiscountPolicy{

    private int discountFixAmount = 1000; //1000원 할인

    @Override
    public int discount(Member member, int price) {
        if (member.getGrade() == Grade.VIP) {
            return discountFixAmount;
        }
        else{
            return 0;
        }
    }
}

package com.mks.core.discount;

import com.mks.core.member.Grade;
import com.mks.core.member.Member;

public class RateDiscountPolicy implements DiscountPolicy {

    private int discountPercent = 10;

    @Override
    public int discount(Member member, int price) {
        if(member.getGrade() == Grade.VIP){
            return price * discountPercent / 100;
        }
        else {
            return 0;
        }
    }
}

public class OrderServiceImpl implements OrderService {
    
    private final MemberRepository memberRepository = new MemoryMemberRepository();
    
    //OrderServiceImpl에서 직접 주입해주기 때문에 할인 정책이 바뀔때 마다 변경해줘야함 
    private final DiscountPolicy discountPolicy = new RateDiscountPolicy();
    // private final DiscountPolicy discountPolicy = new FixDiscountPolicy(); 


    @Override
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member, itemPrice);


        return new Order(memberId, itemName, itemPrice, discountPrice);
    }
}

public class AppConfig {
    // 애플리케이션 전체 동작 방식을 구성해주기 위한 별도의 클래스 (객체 생성 및 연결/주입만을 담당함)
    public MemberService memberService(){
        return new MemberServiceImpl(new MemoryMemberRepository());
    }

    public OrderService orderService(){
        return new OrderServiceImpl(new MemoryMemberRepository(), new FixDiscountPolicy());
    }
}

public class MemberServiceImpl implements MemberService {

    private final MemberRepository memberRepository;

    public MemberServiceImpl(MemberRepository memberRepository) {
        this.memberRepository = memberRepository;
    }

    @Override
    public void join(Member member) {
        memberRepository.save(member);
    }

    @Override
    public Member findMember(Long memberId) {
        return memberRepository.findById(memberId);
    }
}

public class OrderServiceImpl implements OrderService{

    private final MemberRepository memberRepository;
    private final DiscountPolicy discountPolicy;

    public OrderServiceImpl(MemberRepository memberRepository, DiscountPolicy discountPolicy) {
        this.memberRepository = memberRepository;
        this.discountPolicy = discountPolicy;
    }

    @Override
    public Order createOrder(Long memberId, String itemName, int itemPrice) {
        Member member = memberRepository.findById(memberId);
        int discountPrice = discountPolicy.discount(member,itemPrice);

        return new Order(memberId,itemName,itemPrice,discountPrice);
    }
}

public class AppConfig {
    public MemberService memberService (){
        return new MemberServiceImpl(memberRepository());
    }

    private MemberRepository memberRepository() {
        return new MemoryMemberRepository();
    }

    public OrderService orderService(){
        return new OrderServiceImpl(memberRepository(), discountPolicy());
    }

    public DiscountPolicy discountPolicy (){
    //return new FixDiscountPolicy();
        return new RateDiscountPolicy();
    }
}