package snippet;

import java.io.PrintWriter;
import java.io.StringWriter;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Link;
import org.eclipse.swt.widgets.Text;
import org.eclipse.ui.internal.browser.FallbackScrolledComposite;
import org.eclipse.ui.internal.browser.IBrowserViewerContainer;

public class JFXBrowserText {
	
	private String url;
	
	private FallbackScrolledComposite scomp;
	
	private Label title;
	
	private Label exTitle;
	
	private Label text;
	
	private Label sep;
	
	protected Link link;
	
	private JFXBrowserViewer viewer;
	
	private Button button;
	
	private Text exception;
	
	private boolean expanded;
	
	private Throwable ex;
	
	class ReflowScrolledComposite extends FallbackScrolledComposite {
		
		public ReflowScrolledComposite(Composite parent, int style) {
			super(parent, style);
		}
		
		@Override
		public void reflow(boolean flushCache) {
			updateWidth(this);
			super.reflow(flushCache);
		}
	}
	
	public JFXBrowserText(Composite parent, JFXBrowserViewer viewer, Throwable ex) {
		this.viewer = viewer;
		this.ex = ex;
		Color bg = parent.getDisplay()
				.getSystemColor(SWT.COLOR_LIST_BACKGROUND);
		scomp = new ReflowScrolledComposite(parent, SWT.V_SCROLL | SWT.H_SCROLL);
		Composite client = new Composite(scomp, SWT.NULL);
		fillContent(client, bg);
		scomp.setContent(client);
		scomp.setBackground(bg);
	}
	
	private void fillContent(Composite parent, Color bg) {
		GridLayout layout = new GridLayout();
		layout.verticalSpacing = 10;
		parent.setLayout(layout);
		title = new Label(parent, SWT.WRAP);
		title.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_title);
		title.setFont(JFaceResources.getHeaderFont());
		title.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		title.setBackground(bg);
		
		link = new Link(parent, SWT.WRAP);
		link.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_link);
		link.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		link.setToolTipText(org.eclipse.ui.internal.browser.Messages.BrowserText_tooltip);
		link.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> {
			BusyIndicator.showWhile(link.getDisplay(), () -> doOpenExternal());
		}));
		link.setBackground(bg);
		sep = new Label(parent, SWT.SEPARATOR | SWT.HORIZONTAL);
		sep.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		exTitle = new Label(parent, SWT.NULL);
		exTitle.setBackground(bg);
		exTitle.setFont(JFaceResources.getBannerFont());
		exTitle.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_dtitle);
		exTitle.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		text = new Label(parent, SWT.WRAP);
		text.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_text);
		text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		text.setBackground(bg);
		button = new Button(parent, SWT.PUSH);
		updateButtonText();
		button.addSelectionListener(SelectionListener.widgetSelectedAdapter(e -> {
			toggleException();
		}));
		exception = new Text(parent, SWT.MULTI);
		loadExceptionText();
		GridData gd = new GridData(GridData.FILL_BOTH);
		gd.exclude = true;
		exception.setLayoutData(gd);
	}
	
	private void loadExceptionText() {
		StringWriter swriter = new StringWriter();
		try (PrintWriter writer = new PrintWriter(swriter)) {
			writer.println(ex.getMessage());
			ex.printStackTrace(writer);
		}
		exception.setText(swriter.toString());
	}
	
	protected void toggleException() {
		expanded = !expanded;
		updateButtonText();
		GridData gd = (GridData) exception.getLayoutData();
		gd.exclude = !expanded;
		exception.setVisible(expanded);
		refresh();
	}
	
	private void updateButtonText() {
		if (expanded)
			button.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_button_collapse);
		else
			button.setText(org.eclipse.ui.internal.browser.Messages.BrowserText_button_expand);
	}
	
	protected void updateWidth(Composite parent) {
		Rectangle area = parent.getClientArea();
		updateWidth(title, area.width);
		updateWidth(text, area.width);
		updateWidth(sep, area.width);
		updateWidth(link, area.width);
		updateWidth(exTitle, area.width);
		updateWidth(exception, area.width);
	}
	
	private void updateWidth(Control c, int width) {
		GridData gd = (GridData) c.getLayoutData();
		if (gd != null)
			gd.widthHint = width - 10;
	}
	
	protected void doOpenExternal() {
		IBrowserViewerContainer container = viewer.getContainer();
		if (container != null)
			container.openInExternalBrowser(url);
	}
	
	public Control getControl() {
		return scomp;
	}
	
	public boolean setUrl(String url) {
		this.url = url;
		return true;
	}
	
	public void setFocus() {
		link.setFocus();
	}
	
	public String getUrl() {
		return url;
	}
	
	public void refresh() {
		scomp.reflow(true);
	}
}