package com.oracle.demo01;

import java.util.ArrayList;

import java.util.Scanner;

public class Demo03 {

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);

        Goods g1 = new Goods();

        Goods g2 = new Goods();

        Goods g3 = new Goods();

        g1.gid = 9001;

        g1.name = "少林寺酥饼核桃";

        g1.price = 120;

        g2.gid = 9002;

        g2.name = "尚康杂粮牡丹饼";

        g2.price = 20;

        g3.gid = 9003;

        g3.name = "新疆原产哈密瓜";

        g3.price = 7;

        ArrayList<Goods> arr = new ArrayList<Goods>();

        arr.add(g1);

        arr.add(g2);

        arr.add(g3);

        while (true) {

            show();

            int choose = sc.nextInt();

            switch (choose) {

            case 1:

                getGoods(arr);

                break;

            case 2:

                addGoods(arr);

                break;

            case 3:

                updateGoods(arr);

                break;

            case 4:

                dropGoods(arr);

                break;

            case 5:

                return;

            default:

                System.out.println("您的输入有误，请重新输入！");

                break;

            }

        }

    }

    // 商品展示页面

    public static void show() {

        System.out.println("==================欢迎光临oracle超市==================");

        System.out.println("1.货物清单");

        System.out.println("2.添加货物");

        System.out.println("3.修改货物");

        System.out.println("4.删除货物");

        System.out.println("5.退出");

        System.out.println("请输入您要操作的功能序号：");

    }

    // 查询所有商品

    public static void getGoods(ArrayList<Goods> arr) {

        System.out.println("=======================商品清单======================");

        System.out.println("商品编号\t\t商品名称\t\t商品价格");

        for (int i = 0; i < arr.size(); i++) {

            System.out.println(arr.get(i).gid + "\t\t" + arr.get(i).name + "\t" + arr.get(i).price);

        }

    }

    // 添加商品

    public static void addGoods(ArrayList<Goods> arr) {

        System.out.println("请输入您要新增的商品编号：");

        Scanner sc = new Scanner(System.in);

        int id = sc.nextInt();

        System.out.println("请输入您要新增的商品名称：");

        String name = sc.next();

        System.out.println("请输入您要新增的商品价格：");

        double price = sc.nextDouble();

        Goods goods = new Goods();

        goods.gid = id;

        goods.name = name;

        goods.price = price;

        arr.add(goods);

    }

    // 修改商品

    public static void updateGoods(ArrayList<Goods> arr){

        System.out.println("请输入您要修改的商品编号(输入0返回主菜单)：");

        for(int i=0;i<arr.size();i++){

            System.out.println(arr.get(i).gid+" "+arr.get(i).name);

        }

        Scanner sc=new Scanner(System.in);

        int uid=0;

        aa:while (true) {

            int id=sc.nextInt();

            for(int i=0;i<arr.size();i++){

                if(arr.get(i).gid==id){

                    uid=id;

                    break aa;

                }else if(id==0){

                    return;

                }

            }

            System.out.println("请输入正确的商品编号(输入0返回主菜单)：");

        }

        System.out.println("请修改商品名称：");

        String name=sc.next();

        System.out.println("请修改商品价格：");

        double price=sc.nextDouble();

        //遍历，按id找gid

        for(int i=0;i<arr.size();i++){

            if(arr.get(i).gid==uid){

                arr.get(i).name=name;

                arr.get(i).price=price;

            }

        }

//第二种修改的方法

for (int i = 0; i < arr.size(); i++) {

    if (arr.get(i).gid == uid) {

        Goods goods=new Goods();

        goods.gid=uid;

        goods.name=name;

        goods.price=price;

        arr.set(i, goods);

    }

}

    }

    //删除商品

    private static void dropGoods(ArrayList<Goods> arr) {

        System.out.println("请输入您要删除的商品编号(输入0返回主菜单)：");

        for(int i=0;i<arr.size();i++){

            System.out.println(arr.get(i).gid+" "+arr.get(i).name);

        }

        Scanner sc=new Scanner(System.in);

        int uid=0;

        aa:while (true) {

            int id=sc.nextInt();

            for(int i=0;i<arr.size();i++){

                if(arr.get(i).gid==id){

                    uid=id;

                    break aa;

                }else if(id==0){

                    return;

                }

            }

            System.out.println("请输入正确的商品编号(输入0返回主菜单)：");

        }

        for(int i=0;i<arr.size();i++){

            if(arr.get(i).gid==uid){

                arr.remove(i);

            }

        }

    }

}