From 1fdc757711ffe55d2ed23f7e524133c478edd613 Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Thu, 7 May 2020 11:37:10 +0200
Subject: [PATCH] version checking Fanfix -> Utils

---
 VersionCheck.java | 172 ++++++++++++++++++++++++++++++++++++++++++++++
 ui/UIUtils.java   |  98 ++++++++++++++++++++++++++
 2 files changed, 270 insertions(+)
 create mode 100644 VersionCheck.java

diff --git a/VersionCheck.java b/VersionCheck.java
new file mode 100644
index 0000000..0e16c2b
--- /dev/null
+++ b/VersionCheck.java
@@ -0,0 +1,172 @@
+package be.nikiroo.utils;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+
+/**
+ * Version checker: can check the current version of the program against a
+ * remote changelog, and list the missed updates and their description.
+ * 
+ * @author niki
+ */
+public class VersionCheck {
+	private static final String base = "https://github.com/${PROJECT}/raw/master/changelog${LANG}.md";
+	private static Downloader downloader = new Downloader(null);
+
+	private Version current;
+	private List<Version> newer;
+	private Map<Version, List<String>> changes;
+
+	/**
+	 * Create a new {@link VersionCheck}.
+	 * 
+	 * @param current
+	 *            the current version of the program
+	 * @param newer
+	 *            the list of available {@link Version}s newer the current one
+	 * @param changes
+	 *            the list of changes
+	 */
+	private VersionCheck(Version current, List<Version> newer,
+			Map<Version, List<String>> changes) {
+		this.current = current;
+		this.newer = newer;
+		this.changes = changes;
+	}
+
+	/**
+	 * Check if there are more recent {@link Version}s of this program
+	 * available.
+	 * 
+	 * @return TRUE if there is at least one
+	 */
+	public boolean isNewVersionAvailable() {
+		return !newer.isEmpty();
+	}
+
+	/**
+	 * The current {@link Version} of the program.
+	 * 
+	 * @return the current {@link Version}
+	 */
+	public Version getCurrentVersion() {
+		return current;
+	}
+
+	/**
+	 * The list of available {@link Version}s newer than the current one.
+	 * 
+	 * @return the newer {@link Version}s
+	 */
+	public List<Version> getNewer() {
+		return newer;
+	}
+
+	/**
+	 * The list of changes for each available {@link Version} newer than the
+	 * current one.
+	 * 
+	 * @return the list of changes
+	 */
+	public Map<Version, List<String>> getChanges() {
+		return changes;
+	}
+
+	/**
+	 * Check if there are available {@link Version}s of this program more recent
+	 * than the current one.
+	 * 
+	 * @param githubProject
+	 *            the GitHub project to check on, for instance "nikiroo/fanfix"
+	 * @param lang
+	 *            the current locale, so we can try to get the changelog in the
+	 *            correct language (can be NULL, will fetch the default
+	 *            changelog)
+	 * 
+	 * @return a {@link VersionCheck}
+	 * 
+	 * @throws IOException
+	 *             in case of I/O error
+	 */
+	public static VersionCheck check(String githubProject, Locale lang)
+			throws IOException {
+		Version current = Version.getCurrentVersion();
+		List<Version> newer = new ArrayList<Version>();
+		Map<Version, List<String>> changes = new HashMap<Version, List<String>>();
+
+		// Use the right project:
+		String base = VersionCheck.base.replace("${PROJECT}", githubProject);
+
+		// Prepare the URLs according to the user's language (we take here
+		// "-fr_BE" as an example):
+		String fr = lang == null ? "" : "-" + lang.getLanguage();
+		String BE = lang == null ? ""
+				: "_" + lang.getCountry().replace(".UTF8", "");
+		String urlFrBE = base.replace("${LANG}", fr + BE);
+		String urlFr = base.replace("${LANG}", "-" + fr);
+		String urlDefault = base.replace("${LANG}", "");
+
+		InputStream in = null;
+		for (String url : new String[] { urlFrBE, urlFr, urlDefault }) {
+			try {
+				in = downloader.open(new URL(url), false);
+				break;
+			} catch (IOException e) {
+			}
+		}
+
+		if (in == null) {
+			throw new IOException("No changelog found");
+		}
+
+		BufferedReader reader = new BufferedReader(
+				new InputStreamReader(in, "UTF-8"));
+		try {
+			Version version = new Version();
+			for (String line = reader.readLine(); line != null; line = reader
+					.readLine()) {
+				if (line.startsWith("## Version ")) {
+					version = new Version(
+							line.substring("## Version ".length()));
+					if (version.isNewerThan(current)) {
+						newer.add(version);
+						changes.put(version, new ArrayList<String>());
+					} else {
+						version = new Version();
+					}
+				} else if (!version.isEmpty() && !newer.isEmpty()
+						&& !line.isEmpty()) {
+					List<String> ch = changes.get(newer.get(newer.size() - 1));
+					if (!ch.isEmpty() && !line.startsWith("- ")) {
+						int i = ch.size() - 1;
+						ch.set(i, ch.get(i) + " " + line.trim());
+					} else {
+						ch.add(line.substring("- ".length()).trim());
+					}
+				}
+			}
+		} finally {
+			reader.close();
+		}
+
+		return new VersionCheck(current, newer, changes);
+	}
+	
+	@Override
+	public String toString() {
+		return String.format(
+				"Version checker: version [%s], %d releases behind latest version [%s]", //
+				current, //
+				newer.size(), //
+				newer.isEmpty() ? current : newer.get(newer.size() - 1)//
+		);
+	}
+}
diff --git a/ui/UIUtils.java b/ui/UIUtils.java
index 7d78d1e..c7fcf62 100644
--- a/ui/UIUtils.java
+++ b/ui/UIUtils.java
@@ -1,17 +1,30 @@
 package be.nikiroo.utils.ui;
 
 import java.awt.Color;
+import java.awt.Component;
+import java.awt.Desktop;
 import java.awt.GradientPaint;
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.Paint;
 import java.awt.RadialGradientPaint;
 import java.awt.RenderingHints;
+import java.io.IOException;
+import java.net.URISyntaxException;
 
 import javax.swing.JComponent;
+import javax.swing.JEditorPane;
+import javax.swing.JLabel;
+import javax.swing.JOptionPane;
 import javax.swing.JScrollPane;
 import javax.swing.UIManager;
 import javax.swing.UnsupportedLookAndFeelException;
+import javax.swing.event.HyperlinkEvent;
+import javax.swing.event.HyperlinkListener;
+
+import be.nikiroo.fanfix.Instance;
+import be.nikiroo.utils.Version;
+import be.nikiroo.utils.VersionCheck;
 
 /**
  * Some Java Swing utilities.
@@ -234,4 +247,89 @@ public class UIUtils {
 
 		return scroll;
 	}
+
+	/**
+	 * Show a confirmation message to the user to show him the changes since
+	 * last version.
+	 * <p>
+	 * HTML 3.2 supported, links included (the user browser will be launched if
+	 * possible).
+	 * <p>
+	 * If this is already the latest version, a message will still be displayed.
+	 * 
+	 * @param parentComponent
+	 *            determines the {@link java.awt.Frame} in which the dialog is
+	 *            displayed; if <code>null</code>, or if the
+	 *            <code>parentComponent</code> has no {@link java.awt.Frame}, a
+	 *            default {@link java.awt.Frame} is used
+	 * @param updates
+	 *            the new version
+	 * @param introText
+	 *            an introduction text before the list of changes
+	 * @param title
+	 *            the title of the dialog
+	 * 
+	 * @return TRUE if the user clicked on OK, false if the dialog was dismissed
+	 */
+	static public boolean showUpdatedDialog(Component parentComponent,
+			VersionCheck updates, String introText, String title) {
+		
+		StringBuilder builder = new StringBuilder();
+		final JEditorPane updateMessage = new JEditorPane("text/html", "");
+		if (introText != null && !introText.isEmpty()) {
+			builder.append(introText);
+			builder.append("<br>");
+			builder.append("<br>");
+		}
+		for (Version v : updates.getNewer()) {
+			builder.append("\t<b>" //
+					+ "Version " + v.toString() //
+					+ "</b>");
+			builder.append("<br>");
+			builder.append("<ul>");
+			for (String item : updates.getChanges().get(v)) {
+				builder.append("<li>" + item + "</li>");
+			}
+			builder.append("</ul>");
+		}
+
+		// html content
+		updateMessage.setText("<html><body>" //
+				+ builder//
+				+ "</body></html>");
+
+		// handle link events
+		updateMessage.addHyperlinkListener(new HyperlinkListener() {
+			@Override
+			public void hyperlinkUpdate(HyperlinkEvent e) {
+				if (e.getEventType().equals(HyperlinkEvent.EventType.ACTIVATED))
+					try {
+						Desktop.getDesktop().browse(e.getURL().toURI());
+					} catch (IOException ee) {
+						Instance.getInstance().getTraceHandler().error(ee);
+					} catch (URISyntaxException ee) {
+						Instance.getInstance().getTraceHandler().error(ee);
+					}
+			}
+		});
+		updateMessage.setEditable(false);
+		updateMessage.setBackground(new JLabel().getBackground());
+		updateMessage.addHyperlinkListener(new HyperlinkListener() {
+			@Override
+			public void hyperlinkUpdate(HyperlinkEvent evn) {
+				if (evn.getEventType() == HyperlinkEvent.EventType.ACTIVATED) {
+					if (Desktop.isDesktopSupported()) {
+						try {
+							Desktop.getDesktop().browse(evn.getURL().toURI());
+						} catch (IOException e) {
+						} catch (URISyntaxException e) {
+						}
+					}
+				}
+			}
+		});
+
+		return JOptionPane.showConfirmDialog(parentComponent, updateMessage,
+				title, JOptionPane.DEFAULT_OPTION) == JOptionPane.OK_OPTION;
+	}
 }
-- 
2.27.0