package com.onaro.util.jfc.browser;

import java.awt.Cursor;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JLabel;
import javax.swing.SwingConstants;

import com.onaro.util.jfc.DataField;
import com.onaro.util.jfc.Highlighter;
import com.onaro.util.jfc.ISummaryField;
import com.onaro.util.jfc.JComponentHtmlBuilder;
import com.onaro.util.jfc.Messages;
import com.onaro.util.jfc.Resources;
import com.onaro.util.jfc.TextComponentFactory;
import com.onaro.util.jfc.TextComponentFactory.LabelFont;
import com.onaro.util.launch.LaunchUrl;

/**
 * An {@link ISummaryField} component that looks like a web link.
 * Clicking it opens a web browser with the given URL.
 */
public class UrlField extends JLabel implements ISummaryField {    
    private static final long serialVersionUID = 1L;
    private String url = null;

    /**
     * Creates a {@link UrlField}.
     */
    public UrlField() {
        super(Resources.INSTANCE.getExternalLinkIcon());
        setHorizontalTextPosition(SwingConstants.LEADING);// Put icon to the right of the text
        addMouseListener (new LinkHandler());
    }
    
    /**
     * Creates a {@link DataField}
     * @param name of the field, for testing purposes
     */
    public UrlField (String name) {
        this();
        setName (name);
    }
    
    /**
     * Creates a {@link DataField}
     * @param name of the field, for testing purposes
     * @param font {@link LabelFont}
     */
    public UrlField (String name, LabelFont font) {
        this (name);
        setFont (font.getFont());
    }

    /**
     * Defines the text this component will display and the
     * URL that will be visited when the component
     * is clicked.
     * 
     * @param url a URL string
     */
    public void setLink (String url) {
        setLink (url, url);
    }
    
    /**
     * Defines the text this component will display and the
     * URL that will be visited when the component
     * is clicked.
     * 
     * @param url a URL string
     * @param text displayed by the component
     */
    public void setLink (String url, String text) {
        this.url = url;
        if (url == null) {
            clear();
        } else {
            setText (new JComponentHtmlBuilder()
                    .append (JComponentHtmlBuilder.anchor (text))
                    .getText());
            setToolTipText (Messages.INSTANCE.getLinkFieldDescription (text));
			setCursor (Cursor.getPredefinedCursor (Cursor.HAND_CURSOR));
        }
    }

    /**
     * Gets the URL.
     * @return URL string
     */
    public String getUrl() {
        return url;
    }
    
    /**
     * Clears and disables the field.
     */
    @Override
    public void clear() {
        url = null;
        setText (null);
        setCursor (null);
        setEnabled (false);
    }

    @Override
    public boolean isHighlighted() {
        return Highlighter.isHighlighted (this);
    }

    @Override
    public void setHighlight (boolean doHighlight) {
        Highlighter.setHighlighted (this, doHighlight);
        TextComponentFactory.renderHighlight (this, doHighlight);
    }

    private class LinkHandler extends MouseAdapter {
		@Override
		public void mouseClicked (MouseEvent evt) {
		    LaunchUrl.launch (url);
		}
    }
}