/*
 * PublicInfoPanel.java
 *
 * Created on February 6, 2003, 1:30 AM
 */

package MDUtils;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Image;
import javax.swing.*;
import javax.swing.border.*;

/**
 *
 * @author  dickey
 */
public class PublicInfoPanel extends JPanel {
    
    /** The object from which this panel gets the information.   */
    IPublicInformation info;    
    
    private JTextArea description;
    
    private JTextArea instructions;
            
    private static final int panelWidth = 300;
    
    private static final int panelHeight = 300;
    
    final int maxIconWidth = (int) (panelWidth/1.5);
    
    final int maxIconHeight = panelHeight/4;
    
    private JLabel iconArea;
    private ImageIcon icon; //will be placed in iconArea only if loaded successfully
    private boolean badImage = false; //set true if image can't be loaded
    
    public PublicInfoPanel(final IPublicInformation infoObject) {
        
        super();
        assert infoObject != null: "null argument to PublicInfoPanel constructor";
        this.info = infoObject;
        
        this.setLayout(new java.awt.FlowLayout()); //default anyway
        //this.setMaximumSize(new Dimension(panelWidth+50, panelHeight+50));

        String labelinfo = this.info.getObjectName() + " by " + this.info.getAuthor();
        //this.add(new JLabel(labelinfo)); 

        Border panelBorder = BorderFactory.createBevelBorder(BevelBorder.LOWERED,
                                Color.pink, Color.magenta);
        Border titledBorder = new javax.swing.border.TitledBorder(
                                            panelBorder, labelinfo);
        this.setBorder(titledBorder);
        
        {
            String imageURL = infoObject.getImageURLString();
            if (imageURL == null) {
                this.iconArea = new JLabel("[No image available]");
            } else {
                this.iconArea = new JLabel("Attempting to load " + imageURL);
                java.net.URL url;
                try {
                    url = new java.net.URL(imageURL);
                    icon = new ImageIcon(url); //no malformed error -- start loading it
                } catch (Exception e) {
                    System.out.println("\t" + imageURL + " is not a URL string.");
                    //not a valid URL -- try is as just a file name
                    icon = new ImageIcon(imageURL); //start loading it
                    icon.setDescription("Image from " + imageURL);
                }

            }
            assert this.iconArea != null;
            this.add(this.iconArea);
        }
        this.description = new JTextArea("", 4, 20);
        this.description.setLineWrap(true); //needed (at least when scrollbars weren't showing up)
        this.description.setWrapStyleWord(true);
        
        String descriptionText = this.info.getObjectDescription();
        if (descriptionText == null || descriptionText.length() <= 0) {
            descriptionText = "No description available.";
            description.setRows(2);
        } else {
            descriptionText = "Description: " + descriptionText;
        }
        this.description.setText(descriptionText);
        this.description.setFocusable(false);
        this.add(new JScrollPane(this.description));
        
        String instructionsText = this.info.getInstructions();
        if (instructionsText == null || instructionsText.length() <= 0) {
            //don't even create a text area for instructions.
            //instructionsText = "No instructions available.";
        } else {
            instructionsText = "Instructions: " + instructionsText;
            this.instructions = new JTextArea(instructionsText, 4, 20);
            this.instructions.setLineWrap(true);
            this.instructions.setWrapStyleWord(true);
            this.instructions.setFocusable(false);
            this.instructions.setBackground(Color.white);
            this.add(new JScrollPane(this.instructions));
        }
        
        Color preferredColor = this.info.getColor();
        if (preferredColor == null) {
            preferredColor = Color.white;
        }
        this.setBackground(preferredColor);
        this.repaint();
    //end constructor
    }
    
    /** If an image has been loaded, resize it to fit.
     */
    public void resizeIcon(int maxWidth, int maxHeight) {
        if (this.badImage) return;
        if (this.icon == null) return;
        int imageStatus = icon.getImageLoadStatus();
        if (imageStatus != java.awt.MediaTracker.COMPLETE ) {
            if (imageStatus == java.awt.MediaTracker.LOADING) {
                this.iconArea.setText("loading image...");
            } else {
                this.iconArea.setText("image error status =" + imageStatus);
                this.badImage = true;
            }
            return;
        }
        Image oldImage = icon.getImage();
        assert oldImage != null;
        //The image has been loaded. Rescale it to fit.
        double iheight = icon.getIconHeight();
        double iwidth = icon.getIconWidth();
        Dimension desiredSize = new Dimension((int) iwidth, (int) iheight);
        if (iheight > maxHeight || iwidth > maxWidth) {
            double aRatio = iwidth/iheight;
            double scaledWidth = (int)  (Math.min(maxWidth, maxHeight*aRatio));
            double scaledHeight = Math.min(maxHeight, scaledWidth/aRatio);
            assert Math.abs(aRatio - scaledWidth/scaledHeight) <= 0.001;
            // - 1 for height in the following means "preserve aspect ratio"
            Image scaledImage = oldImage.getScaledInstance(
                        (int) scaledWidth, (int) scaledHeight, 0);
            icon.setImage(scaledImage);
            desiredSize = new Dimension((int) scaledWidth, (int) scaledHeight);
        }
        this.remove(this.iconArea); //remove the old label
        this.iconArea = new JLabel(icon);
        iconArea.setPreferredSize(desiredSize);
        this.add(this.iconArea);
        ((JComponent)iconArea.getParent()).revalidate();
    //end resize image
    }
    
    public void repaint() {
        if (this.iconArea != null) {
            resizeIcon(maxIconWidth, maxIconHeight);
        }
        int minHeight = 0;
        if (this.instructions != null) {
            minHeight += this.instructions.getPreferredSize().height;
        }
        if (this.description != null) {
            minHeight += this.description.getPreferredSize().height;
        }
        if (this.iconArea != null) {
            minHeight += this.iconArea.getPreferredSize().height;
        }
        this.setPreferredSize(new Dimension(panelWidth+6, minHeight+50));        
        this.validate();
        super.repaint();
    }
//end PublicInfoPanel    
}