import java.io.*;

/**
 * 該類描述了課表中課程的信息，同時提供了課程對象序列化和反序列化的方法
 */
public class Curriculum {
    private int id = -1;        //
    private String name;        //課程名
    private String teacher;     //任課老師
    private String classroom;   //教室
    private int time;           //上課時間
    private String remark;      //備注信息
    
    public static final String[] WEEKS_LABEL = {"星期一", "星期二", "星期三", "星期四", "星期五", "星期六", "星期日"};
    public static final String[] JIE_LABEL = {"第1~2節", "第3~4節", "第5~6節", "第7~8節", "第9~10節"};
    
    public Curriculum(String name) {
        this.name = name;
    }
    
    public String getName() {
        return name;
    }
    
    public void setName(String name) {
        this.name = name;
    }
    
    public String getTeacher() {
        return teacher;
    }
    
    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }
    
    public String getClassroom() {
        return classroom;
    }
    
    public void setClassroom(String classroom) {
        this.classroom = classroom;
    }
    
    //獲取上課的日期，0：星期一, 1:星期二, ..., 7:星期日
    public int getDay() {
        return time/10;
    }
    
    //獲取上課時間，0:第1~2節, 1:第3~4節, ..., 4:第5~6節
    public int getTime() {
        return time%10;
    }
    
    //設置上課日期，時間
    public void setDate(int day, int t) {
        time = day*10 + t;
    }
    
    public String getRemark() {
        return remark;
    }
    
    public void setRemark(String remark) {
        this.remark = remark;
    }
    
    public int getID() {
        return id;
    }
    
    public void setID(int id) {
        this.id = id;
    }
    
    public String toString() {
        return "課程： " + name + "\n任課教師：" + teacher 
                + "\n教室：" + classroom + "\n上課時間： " + WEEKS_LABEL[getDay()] + "   " + JIE_LABEL[getTime()] 
                + "\n備注信息：\n   " + remark;
    }
    
    //使用字節數組data中的數據更新當前課程對象
    public void setData(byte[] data) throws IOException {
        ByteArrayInputStream bais = new ByteArrayInputStream(data);
        DataInputStream dis = new DataInputStream(bais);
        
        this.setName(dis.readUTF());
        this.setTeacher(dis.readUTF());
        this.setClassroom(dis.readUTF());
        int temptime = dis.readInt();
        this.setDate(temptime/10, temptime%10);
        this.setRemark(dis.readUTF());
    }
    
    //將當前課程對象序列化為字節數組
    public byte[] sequence() throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        DataOutputStream dos = new DataOutputStream(baos);
        dos.writeUTF(name);
        dos.writeUTF(teacher);
        dos.writeUTF(classroom);
        dos.writeInt(time);
        dos.writeUTF(remark);
        dos.close();
        baos.close();
        
        return baos.toByteArray();
    }
    
    //反序列化，使用字節數組中的數據生成一個新的課程對象
    public static Curriculum unSequence(byte[] data) throws IOException {
        Curriculum curriculum = new Curriculum(null);
        curriculum.setData(data);
        
        return curriculum;
    }
}