import java.io.IOException;
import java.util.ArrayList;
import java.util.Scanner;
//import static FileOperation;


//javac -encoding UTF-8 xxx.java
class Menu {
    private static ArrayList<Source> sources = new ArrayList<>();
    public static void main(String[] args) throws IOException {
        Scanner in = new Scanner(System.in);
        int choice;//选项
        while (true) {
            showMenu();
            try {
                choice = in.nextInt();
                switch (choice) {
                    case 1:
                        try {
                            sources.add(newSource());
                            System.out.println("添加成功");
                        } catch (Exception e) {
                            System.out.println("添加失败。。等下重试");
                        }
                        break;
                    case 2:
                        System.out.println("课程列表如下：");
                        readSource();
                        break;
                    case 3:
                        querySource();
                        break;
                    case 4:
                        saveSource();
                        break;
                    default:
                        System.out.println("输入有误，请重试");
                        break;
                }
            } catch (Exception e) {
                System.out.println("输入有误，请重试");
            }
        }
    }

    public static void showMenu() {
        System.out.println();
        System.out.println();
        System.out.println("=====================");
        System.out.println("=欢迎使用课程选修系统=");
        System.out.println("=1.     添加课程    =");
        System.out.println("=2.   显示所有课程  =");
        System.out.println("=3.     查询课程    =");
        System.out.println("=4.     保存课程    =");
        System.out.println("=====================");
        System.out.println("输入你的选择:");
    }

    private static Source newSource() {
        /*
         * 课程
         *  课程编号，课程名称，
         课程性质(公共课、必修课、选修课)，总学时，授课学时，
         实验或上机学时，学分，开课学期等信息
         **/
        Scanner in = new Scanner(System.in);
        String sNo;//uuid
        String sName;
        String sXingzhi;
        int sShouke;
        int sShiyan;
        double sXuefen;
        String sXueqi;

        sNo=Utils.uuid();
        System.out.println("输入课程名称:");
        sName=in.next();
        System.out.println("输入课程性质(1--选修，2--必修):");
        sXingzhi=in.next();
        System.out.println("输入授课学时(数字):");
        sShouke=in.nextInt();
        System.out.println("输入实验学时(数字):");
        sShiyan=in.nextInt();
        System.out.println("输入学分:");
        sXuefen=in.nextDouble();
        System.out.println("输入开课学期:");
        sXueqi=in.next();

        return new Source(sNo,sName,sXingzhi,sShouke,sShiyan,sXuefen,sXueqi);

    }

    private static void querySource() throws IOException {
        System.out.println("请输入查询类别：");
        System.out.println("1---按照学分查询");
        System.out.println("2---按照课程性质查询");
        Scanner in = new Scanner(System.in);
        int choice = in.nextInt();
        double key;
        if (choice == 1) {
            System.out.println("输入学分:");
            key = in.nextDouble();
            for (Source sc : sources) {
                if (sc.getsXuefen() == key) {
                    System.out.println(sc);
                }
            }
        } else if (choice == 2) {
            System.out.println("输入查询课程性质(1--选修，2--必修):");
            String xingzhi = in.next();
            for (Source sc : sources) {
                if (sc.getsXingzhi().equals(xingzhi)) {
                    System.out.println(sc);
                }
            }
        } else {
            System.out.println("输入有误");
        }
    }
    private static void readSource() throws IOException {
        FileIO.read(sources);
    }
    private static void saveSource(){
        FileIO.write(sources);
        System.out.println("写入成功");
    }
}