/*
 *	Mizuki Kagaya
 *  CS 161 Program 2
 *
 *
 *	Class: BookApplet	
 *	Functionality: get the data from an HTML file (initial values) and typing,
 *				   send them to a book object, and display them on the screen.
 *				  In addition, users can modify the stored data, by typing new ones and pressing the return key.
 */
 
import java.awt.*;
import java.awt.event.*;
import java.applet.Applet;

public class BookApplet extends Applet implements ActionListener {


	// make an object
	
	Book book1 = new Book();
	
	
	// data
	
	private TextField titleText, publisherText, authorText, isbnText;
	private TextArea outputArea;
	private Label commentLabel, titleLabel, publisherLabel, authorLabel, isbnLabel;
	private String paramTitle, paramPublisher, paramAuthor, paramIsbn;				// parameters to read values from HTML file.
		
		
	// methods
	
	
	/*
	 * init() method: initialization of an applet.
	 */
	 
	public void init() {																	
		
		
		// create instances and set other information of components.
		
		commentLabel = new Label("                               Type some information about a book.                               ");
		titleLabel = new Label("    Book title    ");				// for input fields.
		titleText = new TextField(60);								
		publisherLabel = new Label("    Publisher name    ");
		publisherText = new TextField(60);
		authorLabel = new Label("    Author name    ");
		authorText = new TextField(60);
		isbnLabel = new Label("    ISBN number    ");
		isbnText = new TextField(60);
		outputArea = new TextArea(16, 60);							// for an output field.
		outputArea.setEditable(false);								// make the textarea noneditable.
		
		
		// read the initial values from an HTML file, and send them to a book object.
		
		book1.setTitle(paramTitle = getParameter("title"));			
		book1.setPublisher(paramPublisher = getParameter("publisher"));
		book1.setAuthor(paramAuthor = getParameter("author"));
		book1.setISBN(paramIsbn = getParameter("isbn"));
		
		
		// display components (labels, textfields, button, textarea, and action).
		
		add(commentLabel);
		add(titleLabel);
		add(titleText);
		add(publisherLabel);
		add(publisherText);
		add(authorLabel);
		add(authorText);
		add(isbnLabel);
		add(isbnText);
		add(outputArea);
		
		
		// add ActionListener on text fields.
		
		titleText.addActionListener(this);
		publisherText.addActionListener(this);
		authorText.addActionListener(this);
		isbnText.addActionListener(this);
		
		
		// display the data from HTML inside each textfield.
		
		titleText.setText(paramTitle);
		publisherText.setText(paramPublisher);
		authorText.setText(paramAuthor);
		isbnText.setText(paramIsbn);
		
		
		// (display the initial output to check if data from HTML file were stored in memory(book object))
		
		outputArea.setText("The information of the book is:\n\n\tTitle:          " + book1.getTitle() + "\n\tPublisher:  " + book1.getPublisher()
							 + "\n\tAuthor:      " + book1.getAuthor() + "\n\tISBN:        " + book1.getISBN() + "\n\nThis is the all informaion about the book.\n");
	
	} // init()


	/*
	 *  actionPerformed() method: performs actions when the action call occurs.
	 */

	public void actionPerformed(ActionEvent e) { 
			
			
		// When a return key is pressed in a textfield (input field), data are stored at a book object.
			
		if (e.getSource() == titleText || e.getSource() == publisherText || e.getSource() == authorText || e.getSource() == isbnText) {
			book1.setTitle(titleText.getText());
			book1.setPublisher(publisherText.getText());
			book1.setAuthor(authorText.getText());
			book1.setISBN(isbnText.getText());
			}
		
		
		// display the output of information about a book.
		
		outputArea.setText("The information of the book is:\n\n\tTitle:          " + book1.getTitle() + "\n\tPublisher:  " + book1.getPublisher()
							 + "\n\tAuthor:      " + book1.getAuthor() + "\n\tISBN:        " + book1.getISBN() + "\n\nThis is the all informaion about the book.\n");
	
	} // actionPerformed()
	
} // end of class BookApplet