/*
 * Copyright 2005-2011 Sixth and Red River Software, Bas Leijdekkers
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package com.sixrr.metrics.ui.dialogs;

import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.io.IOException;
import java.net.URL;

import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextPane;
import javax.swing.event.HyperlinkEvent;
import javax.swing.event.HyperlinkListener;

import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.Nullable;
import com.intellij.ide.BrowserUtil;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.ui.DialogWrapper;
import com.intellij.ui.HyperlinkLabel;
import com.intellij.ui.ScrollPaneFactory;
import com.sixrr.metrics.Metric;
import com.sixrr.metrics.utils.MetricsReloadedBundle;

public class ExplanationDialog extends DialogWrapper
{

	private static final Action[] EMPTY_ACTION_ARRAY = new Action[0];

	private final JTextPane textPane = new JTextPane();
	private final HyperlinkLabel urlLabel = new HyperlinkLabel();
	private final JLabel moreInformationLabel = new JLabel(MetricsReloadedBundle.message("for.more.information.go.to"));

	public ExplanationDialog(Project project)
	{
		super(project, false);
		setModal(true);
		init();
		pack();
	}

	public void run(Metric metric)
	{
		@NonNls final String descriptionName = "/metricsDescriptions/" + metric.getID() + ".html";
		final boolean resourceFound = setDescriptionFromResource(descriptionName, metric);
		if(!resourceFound)
		{
			setDescriptionFromResource("/metricsDescriptions/UnderConstruction.html", metric);
		}
		setTitle(MetricsReloadedBundle.message("explanation.dialog.title", metric.getDisplayName()));
		final String helpString = metric.getHelpDisplayString();
		final String helpURL = metric.getHelpURL();
		if(helpString == null)
		{
			urlLabel.setVisible(false);
			moreInformationLabel.setVisible(false);
		}
		else
		{
			urlLabel.setHyperlinkText(helpString);
			urlLabel.setVisible(true);
			moreInformationLabel.setVisible(true);
		}
		urlLabel.addHyperlinkListener(new HyperlinkListener()
		{
			@Override
			public void hyperlinkUpdate(HyperlinkEvent e)
			{
				if(helpURL != null)
				{
					BrowserUtil.launchBrowser("http://" + helpURL);
				}
			}
		});
		show();
	}

	private boolean setDescriptionFromResource(@NonNls String resourceName, Metric metric)
	{
		try
		{
			final URL resourceURL = metric.getClass().getResource(resourceName);
			textPane.setPage(resourceURL);
			return true;
		}
		catch(IOException ignored)
		{
			return false;
		}
	}

	@Override
	@NonNls
	protected String getDimensionServiceKey()
	{
		return "MetricsReloaded.ExplanationDialog";

	}

	@Override
	public Action[] createActions()
	{
		return EMPTY_ACTION_ARRAY;
	}

	@Override
	@Nullable
	protected JComponent createCenterPanel()
	{
		final JPanel panel = new JPanel();
		panel.setLayout(new GridBagLayout());
		final GridBagConstraints constraints = new GridBagConstraints();
		constraints.weightx = 1.0;
		constraints.weighty = 1.0;
		constraints.gridwidth = 2;
		constraints.fill = GridBagConstraints.BOTH;
		panel.add(ScrollPaneFactory.createScrollPane(textPane), constraints);
		constraints.gridwidth = 1;
		constraints.weightx = 0.0;
		constraints.weighty = 0.0;
		constraints.gridy = 1;
		panel.add(moreInformationLabel, constraints);
		constraints.gridx = 1;
		constraints.insets.left = 5;
		panel.add(urlLabel, constraints);
		return panel;
	}

}
