/*
Research Project:   Graphical Database for Category Theory
                    J. Bradbury, Dr. R. Rosebrugh, I. Rutherford
                    Mount Allison University 2001
File:               ChangeNameFrame.java
Description:	      This file is displayed when the user selects the "Change
                    Name of Category" menu option in the main window. The user
                    can select a category from a choice menu and then
                    enter a new name in the text field below it.
*/

//import statements
import java.awt.*;
import java.awt.event.*;

public class ChangeNameFrame extends Frame {

  Category c = new Category();
  CategoryList l = new CategoryList();

  //Objects in the Graphical User Interface(GUI)
  Button exit = new Button();
  Panel button_panel = new Panel();
  BorderLayout borderLayout1 = new BorderLayout();
  Button okButton = new Button();
  Button cancelButton = new Button();
  Label label2 = new Label();
  Label label1 = new Label();
  TextField newNameField = new TextField();
  TextField currNameField = new TextField();
  MainWindow edit;
  GridBagLayout gridBagLayout1 = new GridBagLayout();
  GBConstraintsEditor g = new GBConstraintsEditor();

  public ChangeNameFrame(CategoryList ltemp, MainWindow ed)
  //Default Constructor with the list of categories as a parameter
  {
    l = ltemp;
    edit = ed;
    edit.enableMenus(false);
    try  {
      jbInit();
    }
    catch (Exception e) {
      e.printStackTrace();
    }
  }

  public boolean handleEvent(Event e)
  {
    if ((e.id == Event.WINDOW_DESTROY))
    {
      edit.enableMenus(true);
      hide();            //hide frame
      dispose();         //free resources
      return true;
    }
    return super.handleEvent(e);
  }

 public boolean action(Event e, Object o)
 {
   if ((e.target == exit) || (e.key == Event.ENTER))
   {
     edit.enableMenus(true);
     hide();            //hide frame
     dispose();         //free resources
     return true;
   }
   return false;
 }


 private void jbInit() throws Exception
 //This function intializes the GUI
 {
    this.setTitle("CTDT: Change Category Name");
    this.setBackground(new Color(192,192,192));
    okButton.setLabel("OK");
    okButton.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        okButton_actionPerformed(e);
      }
    });
    cancelButton.setLabel("Cancel");
    cancelButton.addActionListener(new java.awt.event.ActionListener() {
      public void actionPerformed(ActionEvent e) {
        cancelButton_actionPerformed(e);
      }
    });
    label2.setText("Current Category Name:");
    label1.setText("New Category Name:");
    this.setLayout(gridBagLayout1);
    currNameField.setBackground(Color.white);
    this.add(okButton, g.getConstraints(0, 2, 2, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(14, 16, 12, 0), 114, 8));
    this.add(cancelButton, g.getConstraints(2, 2, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(13, 8, 13, 15), 95, 8));
    this.add(label2, g.getConstraints(0, 0, 2, 1, 0.0, 0.0
            ,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(8, 16, 0, 0), 0, 0));
    this.add(label1, g.getConstraints(0, 1, 1, 1, 0.0, 0.0
            ,GridBagConstraints.WEST, GridBagConstraints.NONE, new Insets(10, 16, 0, 0), 0, 0));
    this.add(newNameField, g.getConstraints(2, 1, 1, 1, 1.0, 0.0
            ,GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(7, 7, 0, 16), 121, 1));
    this.add(currNameField, g.getConstraints(2, 0, 1, 1, 1.0, 0.0
            ,GridBagConstraints.WEST, GridBagConstraints.HORIZONTAL, new Insets(8, 7, 0, 16), 121, 0));
    CategoryNode current = l.head;
    currNameField.setEditable(false);
    currNameField.setText(edit.categoryChoice.getSelectedItem());
    String name = edit.categoryChoice.getSelectedItem();
    c = l.getNode(name);
    newNameField.setBackground(Color.white);
  }

  void okButton_actionPerformed(ActionEvent e)
  //Function called when OK button is pressed. This function
  //take the string in the nameField and makes it the name of
  //the current category
  {
    closeWindow();
  }

  void cancelButton_actionPerformed(ActionEvent e)
  //Function called when Cencel button is pressed. This function
  //take the string in the nameField and makes it the name of
  //the current category
  {
    edit.enableMenus(true);
    hide();
    dispose();
  }

  public void closeWindow()
  {
    if (newNameField.getText().equals(""))
    {
        new MessageDialog(this, "Error", "New category name must be filled in before it can replace existing category name", true);
    }
    else if (edit.catList.doesExist(newNameField.getText()))
    {
        new MessageDialog(this, "Error", "A category with the specified name is already opened", true);
    }
    else
    {
      //Indicate that the category name has been modified
      c.mod.nameChanged = true;
      //Replace old name with new name
      c.name = newNameField.getText();
      //Save category
      l.replaceNode(c);
      edit.categoryChoice.remove(edit.categoryChoice.getSelectedItem());
      edit.categoryChoice.add(c.name);
      edit.categoryChoice.select(c.name);
      edit.enableMenus(true);
      hide();
      dispose();
    }
  }
}