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

public class ReturnInfo
    extends JFrame
    implements ActionListener {
  DataBaseManager db = new DataBaseManager();
  ResultSet rs;
  JPanel panel1, panel2;
  Container c;
  JLabel TipLabel = new JLabel("輸入還書者姓名和書名點擊確定，將調出此書的相關信息");
  JLabel ReturnedBookStudentLabel, ReturnedBookNameLabel,
      ReturnedDateLabel, ReturnedCommentLabel;
  JTextField ReturnedBookStudentTextField, ReturnedBookNameTextField,
      ReturnedDateTextField, ReturnedCommentTextField;
  JButton ClearBtn, YesBtn, UpdateBtn, CancelBtn;
  public ReturnInfo() {
    super("修改書籍還入信息");
    c = getContentPane();
    c.setLayout(new BorderLayout());
    c.add(TipLabel, BorderLayout.NORTH);
    ReturnedBookStudentLabel = new JLabel("還書者姓名", JLabel.CENTER);
    ReturnedBookNameLabel = new JLabel("書名", JLabel.CENTER);
    ReturnedDateLabel = new JLabel("還書日期", JLabel.CENTER);
    ReturnedCommentLabel = new JLabel("備注", JLabel.CENTER);
    ReturnedBookStudentTextField = new JTextField(15);
    ReturnedBookNameTextField = new JTextField(15);
    ReturnedDateTextField = new JTextField(15);
    ReturnedCommentTextField = new JTextField(15);
    panel1 = new JPanel();
    panel1.setLayout(new GridLayout(4, 2));
    panel1.add(ReturnedBookStudentLabel);
    panel1.add(ReturnedBookStudentTextField);
    panel1.add(ReturnedBookNameLabel);
    panel1.add(ReturnedBookNameTextField);
    panel1.add(ReturnedDateLabel);
    panel1.add(ReturnedDateTextField);
    panel1.add(ReturnedCommentLabel);
    panel1.add(ReturnedCommentTextField);
    c.add(panel1, BorderLayout.CENTER);
    panel2 = new JPanel();
    panel2.setLayout(new GridLayout(1, 4));
    ClearBtn = new JButton("清空");
    YesBtn = new JButton("確定");
    UpdateBtn = new JButton("更新");
    CancelBtn = new JButton("取消");
    ClearBtn.addActionListener(this);
    YesBtn.addActionListener(this);
    UpdateBtn.addActionListener(this);
    UpdateBtn.setEnabled(false);
    CancelBtn.addActionListener(this);
    panel2.add(ClearBtn);
    panel2.add(YesBtn);
    panel2.add(UpdateBtn);
    panel2.add(CancelBtn);
    c.add(panel2, BorderLayout.SOUTH);
  }

  public void actionPerformed(ActionEvent e) {
    if (e.getSource() == ClearBtn) {
      ReturnedBookStudentTextField.setText("");
      ReturnedBookNameTextField.setText("");
      ReturnedDateTextField.setText("");
      ReturnedCommentTextField.setText("");
    }
    else if (e.getSource() == CancelBtn) {
      this.dispose();
    }
    else if (e.getSource() == YesBtn) {
      try {
        String strSQL =
            "select studentName,bookName,borrowDate,com from BookBrowse where studentName='" +
            ReturnedBookStudentTextField.getText().trim() + "'and bookName='" +
            ReturnedBookNameTextField.getText().trim() + "'";
        rs = db.getResult(strSQL);
        if (!rs.first()) {
          JOptionPane.showMessageDialog(null, "此學生沒有借過書！或者沒有此書！");

        }
        else {
          ReturnedBookStudentTextField.setText(rs.getString(1).trim());
          ReturnedBookNameTextField.setText(rs.getString(2).trim());
          ReturnedDateTextField.setText(rs.getString(3).trim());
          ReturnedCommentTextField.setText(rs.getString(4).trim());
          UpdateBtn.setEnabled(true);

        }
      }
      catch (Exception ex) {
        System.out.println(ex.toString());
      }

    }
    else if (e.getSource() == UpdateBtn) {
      String strSQL = "update bookBrowse set returnDate=TO_DATE('" +
          ReturnedDateTextField.getText().trim() + "'),com='" +
          ReturnedCommentTextField.getText().trim() + "' where studentName='" +
          ReturnedBookStudentTextField.getText().trim() + "'and bookName='" +
          ReturnedBookNameTextField.getText().trim() + "'";
      if (db.updateSql(strSQL)) {
        JOptionPane.showMessageDialog(null, "更新成功！");
        db.closeConnection();
        this.dispose();
      }
      else {
        JOptionPane.showMessageDialog(null, "更新失敗！");
        db.closeConnection();
        this.dispose();
      }
    }
  }
}