package com.company;

import java.util.Scanner;

/**
 * @author dy
 * @date 2021/4/9 8:24
 */
public class Librarian {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        String[] bookNames = new String[6];
        int[] borrowD = new int[6];
        int[] borrowC = new int[6];
        int[] states = new int[6];

        bookNames[0]="安徒生童话";
        borrowD[0] = 15;
        borrowC[0] = 16;
        states[0] = 0;

        bookNames[1]="格林童话";
        borrowD[1] = 15;
        borrowC[1] = 16;
        states[1] = 0;

        bookNames[2]="钢铁是怎样炼成的";
        borrowD[2] = 15;
        borrowC[2] = 16;
        states[2] = 0;

        int num = -1;
        boolean flag = true;
        do {
            System.out.println("**************欢迎使用Librarian系统*************");
            System.out.println("\t\t\t\t\t\t1.新增图书");
            System.out.println("\t\t\t\t\t\t2.查看图书");
            System.out.println("\t\t\t\t\t\t3.借阅图书");
            System.out.println("\t\t\t\t\t\t4.归还图书");
            System.out.println("\t\t\t\t\t\t5.删除图书");
            System.out.println("\t\t\t\t\t\t6.退出系统");

            System.out.println("\n请选择：");
            int choose = sc.nextInt();
            while (choose<0 || choose>6){
                System.out.println("出入错误，请重新输入");
                choose = sc.nextInt();
            }switch (choose){
                case 1:
                    System.out.println("**********1.新增图书*********");
                    System.out.println("请输入图书名字");
                    String addBook = sc.next();
                    boolean isAdd = false;
                    for (int i = 1; i <bookNames.length;i++){
                        if (bookNames[i] == null){
                            isAdd = true;
                            bookNames[i] = addBook;
                            System.out.println("新增成功！");
                            break;
                        }else {
                            isAdd = false;
                        }
                    }
                    for (int i = 0; i<bookNames.length;i++){
                        if (bookNames[i] !=null){
                            String state = (states[i]==0)?"可借阅":"已借阅";
                            String borrowCount = borrowC[i]+"次";
                            String borrowDate = borrowD[i]+"日";
                            System.out.println((i+1)+ "\t\t"+bookNames[i]+"\t\t"+state+"\t\t"+borrowC+"\t\t"+borrowD);
                        }
                    }
                    if (!isAdd){
                        System.out.println("对不起，图书已借出！");
                        break;
                    }
                    break;
                case 2:
                    System.out.println("2.查看图书");
                    System.out.println("序号" + "\t\t\t" + "书名" + "\t\t\t" + "借阅状态" + "\t\t" + "借阅次数"+ "\t\t" + "借阅日期");

                    for (int i=0;i<bookNames.length;i++){
                        if (bookNames[i] !=null){
                            String state = (states[i]==0)?"可借阅":"已借阅";
                            String borrowCount = borrowC[i]+"次";
                            String borrowDate = borrowD[i]+"日";
                            System.out.println((i+1)+ "\t\t"+bookNames[i]+"\t\t"+state+"\t\t"+borrowC+"\t\t"+borrowD);
                        }
                    }break;
                case 3:
                    System.out.println("3.借阅图书");
                    System.out.println("请输入你要借阅图书的名字：" );
                    String borrowName = sc.next();
                    boolean isBorrow = false;
                    for (int i=0;i< bookNames.length;i++){
                        if (bookNames[i] != null && bookNames[i].equals(borrowName)&&states[i] ==0){
                            isBorrow=true;
                            System.out.println("请输入借阅日期：");
                            int borrowRiQi=sc.nextInt();
                            while (borrowRiQi<1 || borrowRiQi>31){
                                System.out.println("输入错误，请重新输入");
                                borrowRiQi = sc.nextInt();
                            }
                            System.out.println("借阅成功！");
                            borrowD[i] = borrowRiQi;
                            states[i] = 1;
                            borrowC[i]++;
                            break;
                        }else  if (bookNames[i] !=null && bookNames[i].equals(borrowName) && states[i] ==1){
                            isBorrow = true;
                            System.out.println("书已借出，不能重复借阅！");
                            break;
                        }
                    }
                    if (!isBorrow){
                        System.out.println("抱歉，找不到该书！");
                        break;
                    }break;
                case 4:
                    System.out.println("4.归还图书");
                    System.out.println("请输入你要归还的图书名字：");
                    String returnName = sc.next();
                    boolean isReturn = false;
                    for (int i=0;i<bookNames.length;i++){
                        if (bookNames[i] !=null && bookNames[i].equals(returnName) && states[i] == 1){
                            isReturn = true;
                            System.out.println("请输入归还日期：");
                            int returnRiQi = sc.nextInt();
                            while (returnRiQi<1 || returnRiQi>31 || returnRiQi<borrowD[i]){
                                if (returnRiQi<1 || returnRiQi >31){
                                    System.out.println("输入错误，请重新输入：");
                                    returnRiQi = sc.nextInt();
                                }else if(returnRiQi<borrowD[i]){
                                    System.out.println("归还日期必须大于借阅日期，请重新输入：");
                                    returnRiQi=sc.nextInt();
                                }
                            }
                            System.out.println("归还成功！");
                            states[i]=0;
                            break;
                        }else if (bookNames[i] !=null && bookNames[i].equals(returnName) && states[i] == 0){
                            isBorrow = true;
                            System.out.println("书可借阅，不能归还！");
                            break;
                        }
                    }
                    if (!isReturn){
                        System.out.println("抱歉，不是本图书馆的书，不能归还！");
                        break;
                    }
                    break;
                case 5:
                    System.out.println("5.删除图书");
                    System.out.print("请输入您要删除图书的名字：");
                    String deleteName = sc.next();
                    boolean isDelete = false;
                    for (int i=0;i<bookNames.length;i++){
                        if (bookNames[i] !=null && bookNames.equals(deleteName) && states[i] == 1){
                            isDelete = true;
                            System.out.println("书已借出，不能删除！");
                            break;
                        }else if (bookNames[i] != null && bookNames[i].equals(deleteName) && states[i] == 0){
                            isDelete = true;
                            int index = -1;
                            if(bookNames[i].equals(deleteName)){
                                index = i;
                            }
                            if(index != -1){
                                for(i = index;i<bookNames.length-1;i++){
                                    bookNames[i] = bookNames[i+1];
                                    borrowD[i] = borrowD[i+1];
                                    borrowC[i] = borrowC[i+1];
                                    states[i] = states[i+1];

                                    bookNames[bookNames.length-1] = null;
                                    borrowD[bookNames.length-1] = 0;
                                    borrowC[bookNames.length-1] = 0;
                                    states[bookNames.length-1] = 0;
                                }
                            }
                            System.out.println("删除图书成功！");
                            break;
                        }
                    }
                    if(!isDelete){
                        System.out.println("不是本图书馆的书，不能删除");
                        break;
                    }
                    break;
                case 6:
                    flag = false;
                    break;
                default:
                    flag = false;
                    break;
            }
            if(flag){
                System.out.print("\n输入0返回：");
                num = sc.nextInt();
            }else{
                break;
            }
        }while (flag);
        System.out.println("谢谢使用！");
    }
}
//这算是一个比较完整的图书管理系统的Java代码，感谢大家的支持与观看！