/**
 * Copyright (c) 2001-2018 Mathew A. Nelson and Robocode contributors
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://robocode.sourceforge.net/license/epl-v10.html
 */
package net.sf.robocode.installer;


import javax.swing.*;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import java.net.URL;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
import java.util.jar.JarInputStream;


/**
 * Installer for Robocode.
 *
 * @author Mathew A. Nelsen (original)
 * @author Flemming N. Larsen (contributor)
 */
public class AutoExtract implements ActionListener {
	private JDialog licenseDialog;
	private boolean accepted;
	private static final String[] SPINNER = { "-", "\\", "|", "/"};
	private String message = "";
	private static File installDir;
	private static final String osName = System.getProperty("os.name");
	private static final double osVersion = doubleValue(System.getProperty("os.version"));
	private static final int JAVA_MAJOR_VERSION = javaMajorVersion();

	private static double doubleValue(String s) {
		s = s.replaceAll("[^.0-9]", ""); // Remove invalid characters, e.g. "3.0-ARCH" become "3.0"

		int p = s.indexOf(".");

		if (p >= 0) {
			p = s.indexOf(".", p + 1);
		}
		if (p >= 0) {
			s = s.substring(0, p);
		}

		double d = 0.0;

		try {
			d = Double.parseDouble(s);
		} catch (NumberFormatException e) {
			e.printStackTrace(System.err);
		}

		return d;
	}

	private boolean acceptLicense() {
		StringBuffer licenseText = new StringBuffer();

		InputStream is;

		JarFile extractJar = null;
		try {
			extractJar = new JarFile("extract.jar");

			is = extractJar.getInputStream(extractJar.getJarEntry("license/cpl-v10.html"));
		} catch (IOException e) {
			return true;
		} finally {
			if (extractJar != null) {
				try {
					extractJar.close();
				} catch (IOException ignore) {}
			}
		}
		if (is == null) {
			return true;
		}

		InputStreamReader isr = null;
		BufferedReader br = null;

		try {
			isr = new InputStreamReader(is);
			br = new BufferedReader(isr);

			String line = br.readLine();

			while (line != null) {
				licenseText.append(line);
				line = br.readLine();
			}
			return acceptReject(licenseText.toString());

		} catch (IOException e) {
			System.err.println("Could not read line from license file: " + e);
		} finally {
			if (br != null) {
				try {
					br.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (isr != null) {
				try {
					isr.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return true;
	}

	private boolean acceptReject(String text) {
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

		licenseDialog = new JDialog();
		licenseDialog.setTitle("License Agreement");
		licenseDialog.setModal(true);
		licenseDialog.setLocation((screenSize.width - 500) / 2, (screenSize.height - 400) / 2);
		licenseDialog.setSize(500, 400);
		JTextPane t = new JTextPane();

		t.setContentType("text/html");
		t.setText(text);
		t.setFont(new Font("Dialog", Font.PLAIN, 12));
		t.setEditable(false);

		JScrollPane s = new JScrollPane();

		s.setViewportView(t);

		licenseDialog.getContentPane().setLayout(new BorderLayout());
		licenseDialog.getContentPane().add(s, BorderLayout.CENTER);

		JPanel p = new JPanel();

		p.setLayout(new BorderLayout());
		JButton b1 = new JButton("Accept");
		JButton b2 = new JButton("Cancel");

		p.add(b1, BorderLayout.WEST);
		p.add(b2, BorderLayout.EAST);

		b1.addActionListener(this);
		b2.addActionListener(this);

		licenseDialog.getContentPane().add(p, BorderLayout.SOUTH);

		licenseDialog.setVisible(true);

		return accepted;
	}

	public void actionPerformed(ActionEvent e) {
		accepted = e.getActionCommand().equals("Accept");
		licenseDialog.dispose();
		licenseDialog = null;
	}

	private boolean extract(File installDir) {
		JDialog statusDialog = new JDialog();
		Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();

		int width = 500;
		int height = 100;

		statusDialog.setTitle("Installing");
		statusDialog.setLocation((screenSize.width - width) / 2, (screenSize.height - height) / 2);
		statusDialog.setSize(width, height);
		JLabel status = new JLabel();

		statusDialog.getContentPane().setLayout(new BorderLayout());
		statusDialog.getContentPane().add(status, BorderLayout.CENTER);

		statusDialog.setVisible(true);

		FileOutputStream fos;
		String entryName;

		byte buf[] = new byte[2048];

		String name = AutoExtract.class.getName().replaceAll("\\.", "/") + ".class";
		String urlJar = AutoExtract.class.getClassLoader().getResource(name).toString();
		String src = urlJar.substring("jar:file:/".length(), urlJar.indexOf("!/"));

		if (src.indexOf('!') > -1) {
			message = src + "\nContains an exclamation point.  Please move the file to a different directory.";
			JOptionPane.showMessageDialog(null, message, "Error", JOptionPane.ERROR_MESSAGE);
			return false;
		}
		JarInputStream jarIS = null;

		try {
			URL url = new URL("file:/" + src);
			InputStream is = url.openStream();

			jarIS = new JarInputStream(is);

			JarEntry entry;

			while ((entry = jarIS.getNextJarEntry()) != null) {
				int spin = 0;

				entryName = entry.getName();
				if (entry.isDirectory()) {
					if (!entryName.startsWith("net") && !(entryName.equals("desktop") && isFreeBSD())) {
						File dir = new File(installDir, entry.getName());
						if (!dir.exists() && !dir.mkdirs()) {
							System.err.println("Can't create dir: " + dir);
						}
					}
				} else if (!entryName.equals(name)) {

					// Skip .bat, .sh, and .command files depending on which OS Robocode is installed

					String entryNameLC = entryName.toLowerCase();

					boolean skipEntry = false;

					boolean isBatFile = entryNameLC.length() > ".bat".length() && entryNameLC.endsWith(".bat");
					boolean isShFile = entryNameLC.length() > ".sh".length() && entryNameLC.endsWith(".sh");
					boolean isCommandFile = entryNameLC.length() > ".command".length()
							&& entryNameLC.endsWith(".command");
					boolean isDesktopFile = entryNameLC.startsWith("desktop/");

					// Unix systems and Mac OS X
					if (File.separatorChar == '/') {
						// Skip .bat files under Unix and Mac OS X
						// Skip .command files under Unix
						skipEntry = isBatFile || (isCommandFile && !isMacOSX()) || (isDesktopFile && !isFreeBSD());
					} else {
						// Under Windows the .sh and .command files are skipped
						skipEntry = isShFile || isCommandFile || isDesktopFile;
					}

					// If we are not skipping the entry, then copy from our .jar into the installation dir
					if (!skipEntry) {
						status.setText(entryName + " " + SPINNER[spin++]);
	
						File out = new File(installDir, entryName);

						File parentDirectory = new File(out.getParent());
						if (!parentDirectory.exists() && !parentDirectory.mkdirs()) {
							System.err.println("Can't create dir: " + parentDirectory);
						}
						fos = new FileOutputStream(out);

						int bytes = 0;
						int count = 0;
						int num;

						while ((num = jarIS.read(buf, 0, 2048)) != -1) {
							fos.write(buf, 0, num);
							bytes += num;
							count++;
							if (count > 80) {
								status.setText(entryName + " " + SPINNER[spin++] + " (" + bytes + " bytes)");
								if (spin > 3) {
									spin = 0;
								}
								count = 0;
							}
						}
						fos.close();						

						// Set file permissions for .sh and .command files under Unix and Mac OS X
						if (File.separatorChar == '/') {
							if (isShFile || isCommandFile) {
								// Grant read and execute access for everyone and also write access for the owner of the file
								Runtime.getRuntime().exec("chmod 755 " + out.toString());
							}
						}

						status.setText(entryName + " " + SPINNER[spin++] + " (" + bytes + " bytes)");
					}
				}
			}
			statusDialog.dispose();
			return true;
		} catch (IOException e) {
			message = "Installation failed: " + e;
			JOptionPane.showMessageDialog(null, message, "Error", JOptionPane.ERROR_MESSAGE);
			return false;
		} finally {
			if (jarIS != null) {
				try {
					jarIS.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
	}

	public static void main(String argv[]) {
		String suggestedDirName;
		
		if (argv.length == 1) {
			suggestedDirName = argv[0];
		} else if (isWindowsOS()) {
			suggestedDirName = "C:\\robocode\\";
		} else {
			suggestedDirName = System.getProperty("user.home") + File.separator + "robocode" + File.separator;
		}

		String message;

		if (install(new File(suggestedDirName))) {
			message = "Installation successful"; 
		} else {
			message = "Installation cancelled";
		}

		// Delete the class file with the installer and it's parent folders in the robocode home dir
		if (installDir != null) {
			String installerPath = AutoExtract.class.getName().replaceAll("\\.", "/") + "$1.class";

			deleteFileAndParentDirsIfEmpty(new File(installDir, installerPath));		
		}

		JOptionPane.showMessageDialog(null, message);
	}
	
	private static boolean install(File suggestedDir) {
		// Verify that the Java version is version 6 (1.6.0) or newer
		if (JAVA_MAJOR_VERSION < 6) {
			String message = "Robocode requires Java 6 (1.6.0) or newer.\n"
					+ "Your system is currently running Java " + JAVA_MAJOR_VERSION + ".\n"
					+ "If you have not installed (or activated) at least\n" + "JRE 6 or JDK 6, please do so.";

			JOptionPane.showMessageDialog(null, message, "Error", JOptionPane.ERROR_MESSAGE);
			System.err.println(message);
			return false;
		}

		// Set native look and feel
		try {
			UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
		} catch (Throwable t) {// For some reason Ubuntu 7 can cause a NullPointerException when trying to getting the LAF
		}

		AutoExtract extractor = new AutoExtract();

		if (extractor.acceptLicense()) {
			boolean done = false;

			while (!done) {
				int rc = JOptionPane.showConfirmDialog(null,
						"Robocode will be installed in:\n" + suggestedDir + "\nIs this ok?", "Installing Robocode",
						JOptionPane.YES_NO_CANCEL_OPTION, JOptionPane.QUESTION_MESSAGE);

				if (rc == JOptionPane.YES_OPTION) {
					installDir = suggestedDir;
					done = true;
				} else if (rc == JOptionPane.NO_OPTION) {
					Object r = JOptionPane.showInputDialog(null, "Please type in the installation directory",
							"Installation Directory", JOptionPane.PLAIN_MESSAGE, null, null, suggestedDir);

					if (r != null) {
						suggestedDir = new File(((String) r).trim());
					} else {
						return false;
					}
				} else if (rc == JOptionPane.CANCEL_OPTION) {
					return false;
				}
			}
			if (!installDir.exists() && !installDir.mkdirs()) {
				System.err.println("Can't create dir: " + installDir);
				return false;
			}
			deleteOldLibs(installDir);

			// The .robotcache has been renamed to .data
			File robotsCacheDir = new File(installDir, "robots/.robotcache");
			File robotsDataDir = new File(installDir, "robots/.data");

			if (robotsCacheDir.exists()) {
				// Rename ".robotcache" into ".data" 
				robotsCacheDir.renameTo(robotsDataDir);
			}
			
			// Fix problem with .data starting with a underscore dir by
			// renaming files containing ".data/_" into ".data"
			if (robotsDataDir.exists()) {
				File underScoreDir = new File(robotsDataDir, "_");
				String[] list = underScoreDir.list(); 

				if (list != null) {
					for (String fileName : list) {
						File file = new File(underScoreDir, fileName);
	
						file.renameTo(new File(robotsDataDir, fileName));
					}
					underScoreDir.delete();
				}
			}

			// Create shortcuts and file associations
			if (extractor.extract(installDir)) {
				extractor.createShortcuts(installDir, "robocode.bat", "Robocode", "Robocode");
				extractor.createFileAssociations(installDir);
				return true;
			}
		}
		return false;
	}

	private static void deleteOldLibs(File installDir) {
		File libs = new File(installDir, "libs");

		if (libs.exists()) {
			File[] del = libs.listFiles(new FilenameFilter() {

				public boolean accept(File dir, String name) {
					String test = name.toLowerCase();

					return test.endsWith(".jar") || test.endsWith(".dll");
				}
			});

			for (File d : del) {
				if (!d.delete()) {
					System.err.println("Can't delete: " + d);
				}
			}
		}
	}

	private static boolean deleteDir(File dir) {
		if (dir.isDirectory()) {
			for (File file : dir.listFiles()) {
				if (file.isDirectory()) {
					// Skip directories ending with ".data" 
					if (file.getName().endsWith(".data")) {
						continue;
					}
					try {
						// Test for symlink and ignore.
						// Robocode won't create one, but just in case a user does...
						if (file.getCanonicalFile().getParentFile().equals(dir.getCanonicalFile())) {
							deleteDir(file);
							if (file.exists() && !file.delete()) {
								System.err.println("Can't delete: " + file);
							}
						} else {
							System.out.println("Warning: " + file + " may be a symlink. It has been ignored");
						}
					} catch (IOException e) {
						System.out.println(
								"Warning: Cannot determine canonical file for " + file + ". It has been ignored");
					}
				} else {
					if (file.exists() && !file.delete()) {
						System.err.println("Can't delete: " + file);
					}
				}
			}
			return dir.delete();
		}
		return false;
	}

	private void createShortcuts(File installDir, String runnable, String folder, String name) {
		if (osName.toLowerCase().indexOf("win") == 0) {
			if (createWindowsShortcuts(installDir, runnable, folder, name) == false) {
				JOptionPane.showMessageDialog(null,
						message + "\n" + "To start Robocode, enter the following at a command prompt:\n" + "cd "
						+ installDir.getAbsolutePath() + "\n" + "robocode.bat");
			}
		} else if (osName.toLowerCase().indexOf("mac") == 0) {
			if (osVersion >= 10.1) {
				JOptionPane.showMessageDialog(null,
						message + "\n" + "To start Robocode, browse to " + installDir + " then double-click robocode.sh\n");
			} else {
				JOptionPane.showMessageDialog(null,
						message + "\n" + "To start Robocode, enter the following at a command prompt:\n"
						+ installDir.getAbsolutePath() + "/robocode.sh");
			}
		} else {
			JOptionPane.showMessageDialog(null,
					message + "\n" + "To start Robocode, enter the following at a command prompt:\n"
					+ installDir.getAbsolutePath() + "/robocode.sh");
		}
	}

	private boolean createWindowsShortcuts(File installDir, String runnable, String folder, String name) {
		int rc = JOptionPane.showConfirmDialog(null,
				"Would you like to install a shortcut to Robocode in the Start menu? (Recommended)", "Create Shortcuts",
				JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

		if (rc != JOptionPane.YES_OPTION) {
			return false;
		}

		String command = getWindowsCmd() + " cscript.exe ";

		try {
			File shortcutMaker = new File(installDir, "makeshortcut.vbs");
			PrintStream out = new PrintStream(new FileOutputStream(shortcutMaker));

			out.println("WScript.Echo(\"Creating shortcuts...\")");
			out.println("Set Shell = CreateObject (\"WScript.Shell\")");
			out.println("Set fso = CreateObject(\"Scripting.FileSystemObject\")");
			out.println("ProgramsPath = Shell.SpecialFolders(\"Programs\")");
			out.println("if (not(fso.folderExists(ProgramsPath + \"\\\\" + folder + "\"))) Then");
			out.println("	fso.CreateFolder(ProgramsPath + \"\\\\" + folder + "\")");
			out.println("End If");
			out.println("Set link = Shell.CreateShortcut(ProgramsPath + \"\\\\" + folder + "\\\\" + name + ".lnk\")");
			out.println("link.Arguments = \"\"");
			out.println("link.Description = \"" + name + "\"");
			out.println("link.HotKey = \"\"");
			out.println("link.IconLocation = \"" + escaped(installDir.getAbsolutePath()) + "\\\\" + "robocode.ico,0\"");
			out.println("link.TargetPath = \"" + escaped(installDir.getAbsolutePath()) + "\\\\" + runnable + "\"");
			out.println("link.WindowStyle = 1");
			out.println("link.WorkingDirectory = \"" + escaped(installDir.getAbsolutePath()) + "\"");
			out.println("link.Save()");
			out.println("DesktopPath = Shell.SpecialFolders(\"Desktop\")");
			out.println("Set link = Shell.CreateShortcut(DesktopPath + \"\\\\" + name + ".lnk\")");
			out.println("link.Arguments = \"\"");
			out.println("link.Description = \"" + name + "\"");
			out.println("link.HotKey = \"\"");
			out.println("link.IconLocation = \"" + escaped(installDir.getAbsolutePath()) + "\\\\" + "robocode.ico,0\"");
			out.println("link.TargetPath = \"" + escaped(installDir.getAbsolutePath()) + "\\\\" + runnable + "\"");
			out.println("link.WindowStyle = 1");
			out.println("link.WorkingDirectory = \"" + escaped(installDir.getAbsolutePath()) + "\"");
			out.println("link.Save()");
			out.println("WScript.Echo(\"Shortcuts created.\")");

			out.close();

			Process p = Runtime.getRuntime().exec(command + " makeshortcut.vbs", null, installDir);
			int rv = p.waitFor();

			if (rv != 0) {
				System.err.println("Can't create shortcut: " + shortcutMaker);
				return false;
			}
			JOptionPane.showMessageDialog(null,
					message + "\n" + "A Robocode program group has been added to your Start menu\n"
					+ "A Robocode icon has been added to your desktop.");
			if (!shortcutMaker.delete()) {
				System.err.println("Can't delete: " + shortcutMaker);
			}
			return true;
		} catch (IOException e) {
			e.printStackTrace(System.err);
		} catch (InterruptedException e) {
			e.printStackTrace(System.err);
		}

		return false;
	}

	private void createFileAssociations(File installDir) {
		if (isWindowsOS()) {
			createWindowsFileAssociations(installDir);
		}
	}

	private void createWindowsFileAssociations(File installDir) {
		int rc = JOptionPane.showConfirmDialog(null,
				"Would you like to create file associations for Robocode in\n"
				+ "the Windows Registry for the file extensions .battle and .br?\n"
				+ "Please notice that you might need to grant permission to add\n"
				+ "the file associations in the Registry, and you must be an\n"
				+ "administrator or granted permission to change the registry.",
				"Create File Associations",
				JOptionPane.YES_NO_OPTION,
				JOptionPane.QUESTION_MESSAGE);

		if (rc != JOptionPane.YES_OPTION) {
			return;
		}

		File file = null;
		PrintStream out = null;

		try {
			file = new File(installDir + "\\FileAssoc.reg");

			out = new PrintStream(new FileOutputStream(file));

			String installPath = installDir.getAbsolutePath();

			out.print(
					createWindowsRegistryFileAssociation(installPath, ".battle", "Robocode.BattleSpecification",
					"Robocode Battle Specification", "-battle"));
			out.print(
					createWindowsRegistryFileAssociation(installPath, ".br", "Robocode.BattleRecord", "Robocode Battle Record",
					"-replay"));

			out.close();
			out = null;

			Process p = Runtime.getRuntime().exec(getWindowsCmd() + file.getAbsolutePath(), null, null);
			int rv;

			try {
				rv = p.waitFor();
				if (rv != 0) {
					System.err.println("Could not create association(s)");
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (out != null) {
				out.close();
			}
			if (file != null) {
				if (!file.delete()) {
					System.err.println("Could not delete the file: " + file);
				}
			}
		}
	}

	private static String createWindowsRegistryFileAssociation(String installDir, String fileExt, String progId, String description, String robocodeCmdParam) {
		StringBuffer sb = new StringBuffer();

		String HKCR = "[HKEY_CLASSES_ROOT\\";

		sb.append("REGEDIT4\n");
		sb.append(HKCR).append(fileExt).append("]\n");
		sb.append("@=\"").append(progId).append("\"\n");
		sb.append(HKCR).append(progId).append("]\n");
		sb.append("@=\"").append(description).append("\"\n");
		sb.append(HKCR).append(progId).append("\\shell]\n");
		sb.append(HKCR).append(progId).append("\\shell\\open]\n");
		sb.append(HKCR).append(progId).append("\\shell\\open\\command]\n");
		sb.append("@=\"").append(getWindowsCmd()).append("\\\"cd \\\"").append(installDir.replaceAll("[\\\\]", "\\\\\\\\")).append("\\\" && robocode.bat ").append(robocodeCmdParam).append(
				" \\\"%1\\\"\\\"\"\n");

		return sb.toString();
	}

	private static String escaped(String s) {
		StringBuffer eascaped = new StringBuffer();

		for (int i = 0; i < s.length(); i++) {
			if (s.charAt(i) == '\\') {
				eascaped.append('\\');
			}
			eascaped.append(s.charAt(i));
		}
		return eascaped.toString();
	}

	private static boolean isWindowsOS() {
		return osName.startsWith("Windows ");
	}

	private static boolean isMacOSX() {
		return osName.startsWith("Mac OS X");
	}

	private static boolean isFreeBSD() {
		return osName.equals("FreeBSD");
	}

	private static String getWindowsCmd() {
		String os = System.getProperty("os.name");

		return ((os.equals("Windows 95") || os.equals("Windows 95") || os.equals("Windows ME"))
				? "command.com"
				: "cmd.exe")
						+ " /C ";
	}

	/**
	 * Deletes a file and afterwards deletes the parent directories that are empty.
	 *
	 * @param file the file or directory to delete
	 * @return true if success
	 */
	private static boolean deleteFileAndParentDirsIfEmpty(File file) {
		boolean wasDeleted = false;

		if (file != null && file.exists()) {
			if (file.isDirectory()) {
				wasDeleted = deleteDir(file);
			} else {
				wasDeleted = file.delete();

				File parent = file;
				
				while (wasDeleted && (parent = parent.getParentFile()) != null) {
					// Delete parent directory, but only if it is empty
					File[] files = parent.listFiles();

					if (files != null && files.length == 0) {
						wasDeleted = deleteDir(parent);
					} else {
						wasDeleted = false;
					}
				}
			}
		}
		return wasDeleted;
	}

	private static int javaMajorVersion() {
		String version = System.getProperty("java.version");

		String major;

		if (version.startsWith("1.")) {
			major = version.substring(2, version.lastIndexOf('.'));
		} else {		
			int index = version.indexOf('.');
			if (index > 0) {
				major = version.substring(0, index);
			} else {
				index = version.indexOf('-');
				if (index > 0) {
					major = version.substring(0, index);
				} else {
					major = version;
				}
			}
		}
		return Integer.parseInt(major);
	}
}
