import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class MainFrame
    extends JFrame
    implements ActionListener {
  JPanel panel1;
  Container c;
  JMenuBar menuB;
  JMenu systemMenu, bookMGRMenu, borrowBookMenu, returnBookMenu,
      infoBrowseMenu, userMGRMenu,aboutMenu;
  JMenuItem userLoginMenuItem, userAddMenuItem, userModifyMenuItem,
      userDeleteMenuItem, exitMenuItem, bookAddMenuItem, bookModifyMenuItem,
      bookDeleteMenuItem,
      borrowBookMenuItem, borrowInfoMenuItem, returnBookMenuItem,
      returnInfoMenuItem,
      bookListMenuItem, borrowBookListMenuItem, userListMenuItem,
      aboutMenuItem;
  public MainFrame() {
    super("圖書館管理系統");
    //--系統管理菜單--
    menuB = new JMenuBar();
    systemMenu = new JMenu("系統管理");
    userMGRMenu = new JMenu("用戶管理");
    userLoginMenuItem = new JMenuItem("用戶登錄");
    userAddMenuItem = new JMenuItem("添加用戶");
    userModifyMenuItem = new JMenuItem("修改密碼");
    userDeleteMenuItem = new JMenuItem("刪除用戶");
    exitMenuItem = new JMenuItem("退出");
    systemMenu.add(userLoginMenuItem);
    userMGRMenu.add(userAddMenuItem);
    userMGRMenu.add(userModifyMenuItem);
    userMGRMenu.add(userDeleteMenuItem);
    systemMenu.add(userMGRMenu);
    systemMenu.add(exitMenuItem);
    userLoginMenuItem.addActionListener(this);
    userAddMenuItem.addActionListener(this);
    userModifyMenuItem.addActionListener(this);
    userDeleteMenuItem.addActionListener(this);
    exitMenuItem.addActionListener(this);
    menuB.add(systemMenu);
    //---書籍管理菜單--
    bookMGRMenu = new JMenu("書籍管理");
    bookAddMenuItem = new JMenuItem("添加書籍");
    bookModifyMenuItem = new JMenuItem("修改書籍");
    bookDeleteMenuItem = new JMenuItem("刪除書籍");
    bookMGRMenu.add(bookAddMenuItem);
    bookMGRMenu.add(bookModifyMenuItem);
    bookMGRMenu.add(bookDeleteMenuItem);
    bookAddMenuItem.addActionListener(this);
    bookModifyMenuItem.addActionListener(this);
    bookDeleteMenuItem.addActionListener(this);
    menuB.add(bookMGRMenu);
    //--借書管理菜單--
    borrowBookMenu = new JMenu("借書管理");
    borrowBookMenuItem = new JMenuItem("書籍出借");
    borrowInfoMenuItem = new JMenuItem("出借信息修改");
    borrowBookMenu.add(borrowBookMenuItem);
    borrowBookMenu.add(borrowInfoMenuItem);
    borrowBookMenuItem.addActionListener(this);
    borrowInfoMenuItem.addActionListener(this);
    menuB.add(borrowBookMenu);
    //--還書管理菜單--
    returnBookMenu = new JMenu("還書管理");
    returnBookMenuItem = new JMenuItem("書籍還入");
    returnInfoMenuItem = new JMenuItem("書籍還入信息修改");
    returnBookMenu.add(returnBookMenuItem);
    returnBookMenu.add(returnInfoMenuItem);
    returnBookMenuItem.addActionListener(this);
    returnInfoMenuItem.addActionListener(this);
    menuB.add(returnBookMenu);
    //--信息一覽菜單--
    infoBrowseMenu = new JMenu("信息查詢");
    bookListMenuItem = new JMenuItem("書籍信息查詢");
    borrowBookListMenuItem = new JMenuItem("借閱信息查詢");
    userListMenuItem = new JMenuItem("用戶列表");
    infoBrowseMenu.add(bookListMenuItem);
    infoBrowseMenu.add(borrowBookListMenuItem);
    infoBrowseMenu.add(userListMenuItem);
    bookListMenuItem.addActionListener(this);
    borrowBookListMenuItem.addActionListener(this);
    userListMenuItem.addActionListener(this);
    menuB.add(infoBrowseMenu);
    //--關于菜單--
    aboutMenu=new JMenu("幫助");
    aboutMenuItem = new JMenuItem("關于");
    aboutMenuItem.addActionListener(this);
    aboutMenu.add(aboutMenuItem);
    menuB.add(aboutMenu);
    //----------------------------------
    setJMenuBar(menuB);

    c = getContentPane();
    c.setLayout(new BorderLayout());
    panel1 = new JPanel();
    panel1.setLayout(new BorderLayout());

    c.add(panel1, BorderLayout.CENTER);

    //--設置初始功能:--
    userMGRMenu.setEnabled(false);
    bookMGRMenu.setEnabled(false);
    borrowBookMenu.setEnabled(false);
    returnBookMenu.setEnabled(false);
    infoBrowseMenu.setEnabled(false);
    aboutMenu.setEnabled(false);
  }

  //--設置每個菜單點擊后出現的窗口和窗口顯示的位置--
  public void actionPerformed(ActionEvent e) {
    if (e.getActionCommand() == "用戶登錄") {
      UserLogin UserLoginFrame = new UserLogin(this);//創建用例類實例對象
      Dimension FrameSize = UserLoginFrame.getPreferredSize();//子窗口大小
      Dimension MainFrameSize = getSize();//主窗口大小
      Point loc = getLocation();//主窗口位置
      UserLoginFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                 loc.x,
                                 (MainFrameSize.height - FrameSize.height) / 2 +
                                 loc.y);//設置子窗口的位置位于主窗口的中央
      UserLoginFrame.pack();
      UserLoginFrame.show();
    }
    else if (e.getActionCommand() == "添加用戶") {
      UserAdd UserAddFrame = new UserAdd();
      Dimension FrameSize = UserAddFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserAddFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                               loc.x,
                               (MainFrameSize.height - FrameSize.height) / 2 +
                               loc.y);
      UserAddFrame.pack();
      UserAddFrame.show();
    }
    else if (e.getActionCommand() == "修改密碼") {
      UserModify UserModifyFrame = new UserModify();
      Dimension FrameSize = UserModifyFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserModifyFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      UserModifyFrame.pack();
      UserModifyFrame.show();
    }
    else if (e.getActionCommand() == "刪除用戶") {
      UserDelete UserDeleteFrame = new UserDelete();
      Dimension FrameSize = UserDeleteFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserDeleteFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      UserDeleteFrame.pack();
      UserDeleteFrame.show();
    }
    else if (e.getActionCommand() == "添加書籍") {
      BookAdd BookAddFrame = new BookAdd();
      Dimension FrameSize = BookAddFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookAddFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                               loc.x,
                               (MainFrameSize.height - FrameSize.height) / 2 +
                               loc.y);
      BookAddFrame.pack();
      BookAddFrame.show();
    }
    else if (e.getActionCommand() == "修改書籍") {
      BookModify BookModifyFrame = new BookModify();
      Dimension FrameSize = BookModifyFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookModifyFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      BookModifyFrame.pack();
      BookModifyFrame.show();
    }
    else if (e.getActionCommand() == "刪除書籍") {
      BookDelete BookDeleteFrame = new BookDelete();
      Dimension FrameSize = BookDeleteFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookDeleteFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      BookDeleteFrame.pack();
      BookDeleteFrame.show();
    }
    else if (e.getActionCommand() == "書籍出借") {
      BorrowBook BorrowBookFrame = new BorrowBook();
      Dimension FrameSize = BorrowBookFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BorrowBookFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      BorrowBookFrame.pack();
      BorrowBookFrame.show();
    }
    else if (e.getActionCommand() == "出借信息修改") {
      BorrowInfo BorrowInfoFrame = new BorrowInfo();
      Dimension FrameSize = BorrowInfoFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BorrowInfoFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      BorrowInfoFrame.pack();
      BorrowInfoFrame.show();
    }
    else if (e.getActionCommand() == "書籍還入") {
      ReturnBook ReturnBookFrame = new ReturnBook();
      Dimension FrameSize = ReturnBookFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      ReturnBookFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      ReturnBookFrame.pack();
      ReturnBookFrame.show();
    }
    else if (e.getActionCommand() == "書籍還入信息修改") {
      ReturnInfo ReturnInfoFrame = new ReturnInfo();
      Dimension FrameSize = ReturnInfoFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      ReturnInfoFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                  loc.x,
                                  (MainFrameSize.height - FrameSize.height) / 2 +
                                  loc.y);
      ReturnInfoFrame.pack();
      ReturnInfoFrame.show();
    }
    else if (e.getActionCommand() == "書籍信息查詢") {
      BookList BookListFrame = new BookList();
      Dimension FrameSize = BookListFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BookListFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                loc.x,
                                (MainFrameSize.height - FrameSize.height) / 2 +
                                loc.y);
      BookListFrame.pack();
      BookListFrame.show();
    }
    else if (e.getActionCommand() == "借閱信息查詢") {
      BorrowBookList BorrowBookListFrame = new BorrowBookList();
      Dimension FrameSize = BorrowBookListFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      BorrowBookListFrame.setLocation( (MainFrameSize.width - FrameSize.width) /
                                      2 + loc.x,
                                      (MainFrameSize.height - FrameSize.height) /
                                      2 + loc.y);
      BorrowBookListFrame.pack();
      BorrowBookListFrame.show();
    }
    else if (e.getActionCommand() == "用戶列表") {
      UserList UserListFrame = new UserList();
      Dimension FrameSize = UserListFrame.getPreferredSize();
      Dimension MainFrameSize = getSize();
      Point loc = getLocation();
      UserListFrame.setLocation( (MainFrameSize.width - FrameSize.width) / 2 +
                                loc.x,
                                (MainFrameSize.height - FrameSize.height) / 2 +
                                loc.y);
      UserListFrame.pack();
      UserListFrame.show();
    }
    else if (e.getActionCommand() == "關于") {
      String str = "本程序為圖書館管理系統，設計者為麥密輝\n"+
          "本書作者在原系統的基礎上做了一小部分修改\n";
      JOptionPane.showMessageDialog(null, str, "關于",
                                    JOptionPane.INFORMATION_MESSAGE);
    }
    else if (e.getActionCommand() == "退出") {
      this.dispose();
      System.exit(0);
    }
  }

  //--設置登錄用戶的權限--
  public void setEnable(String powerType) {
    if (powerType.trim().equals("系統管理員")) {
      userMGRMenu.setEnabled(true);
      bookMGRMenu.setEnabled(true);
      borrowBookMenu.setEnabled(true);
      returnBookMenu.setEnabled(true);
      infoBrowseMenu.setEnabled(true);
      userListMenuItem.setEnabled(true);
      aboutMenu.setEnabled(true);
    }
    else if (powerType.trim().equals("書籍管理員")) {
      userMGRMenu.setEnabled(false);
      bookMGRMenu.setEnabled(true);
      borrowBookMenu.setEnabled(false);
      returnBookMenu.setEnabled(false);
      infoBrowseMenu.setEnabled(true);
      userListMenuItem.setEnabled(false);
      aboutMenu.setEnabled(true);
    }
    else if (powerType.trim().equals("借閱管理員")) {
      userMGRMenu.setEnabled(false);
      bookMGRMenu.setEnabled(false);
      borrowBookMenu.setEnabled(true);
      returnBookMenu.setEnabled(true);
      infoBrowseMenu.setEnabled(true);
      userListMenuItem.setEnabled(false);
      aboutMenu.setEnabled(true);
    }
    else if (powerType.trim().equals("else")) {
      userMGRMenu.setEnabled(false);
      bookMGRMenu.setEnabled(false);
      borrowBookMenu.setEnabled(false);
      returnBookMenu.setEnabled(false);
      infoBrowseMenu.setEnabled(false);
      aboutMenu.setEnabled(false);
    }
  }

  public static void main(String args[]) {
    try {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch (Exception e) {
      e.printStackTrace();
    }

    MainFrame mainFrame = new MainFrame();
    mainFrame.setSize(400,300);
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
    mainFrame.setLocation( (d.width - mainFrame.getSize().width) / 2,
                      (d.height - mainFrame.getSize().height) / 2);
    mainFrame.show();
  }
}