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	/*
	* Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package jdk.jfr.internal.tool;

	import java.io.File;
	import java.io.FileNotFoundException;
	import java.io.IOError;
	import java.io.IOException;
	import java.io.PrintStream;
	import java.io.RandomAccessFile;
	import java.nio.file.Files;
	import java.nio.file.InvalidPathException;
	import java.nio.file.Path;
	import java.nio.file.Paths;
	import java.util.ArrayList;
	import java.util.Collections;
	import java.util.Deque;
	import java.util.List;

	abstract class Command {
	public final static String title = "Tool for working with Flight Recorder files (.jfr)";
	private final static Command HELP = new Help();
	private final static List<Command> COMMANDS = createCommands();

	private static List<Command> createCommands() {
	List<Command> commands = new ArrayList<>();
	commands.add(new Print());
	commands.add(new Metadata());
	commands.add(new Summary());
	commands.add(new Assemble());
	commands.add(new Disassemble());
	commands.add(new Version());
	commands.add(HELP);
	return Collections.unmodifiableList(commands);
	}

	static void displayHelp() {
	System.out.println(title);
	System.out.println();
	displayAvailableCommands(System.out);
	}

	abstract public String getName();

	abstract public String getDescription();

	abstract public void execute(Deque<String> argList) throws UserSyntaxException, UserDataException;

	protected String getTitle() {
	return getDescription();
	}

	static void displayAvailableCommands(PrintStream stream) {
	boolean first = true;
	for (Command c : Command.COMMANDS) {
	if (!first) {
	System.out.println();
	}
	displayCommand(stream, c);
	stream.println(" " + c.getDescription());
	first = false;
	}
	}

	protected static void displayCommand(PrintStream stream, Command c) {
	boolean firstSyntax = true;
	String alias = buildAlias(c);
	String initial = " jfr " + c.getName();
	for (String syntaxLine : c.getOptionSyntax()) {
	if (firstSyntax) {
	if (syntaxLine.length() != 0) {
	stream.println(initial + " " + syntaxLine + alias);
	} else {
	stream.println(initial + alias);
	}
	} else {
	for (int i = 0; i < initial.length(); i++) {
	stream.print(" ");
	}
	stream.println(" " + syntaxLine);
	}
	firstSyntax = false;
	}
	}

	private static String buildAlias(Command c) {
	List<String> aliases = c.getAliases();
	if (aliases.isEmpty()) {
	return "";
	}
	StringBuilder sb = new StringBuilder();
	if (aliases.size() == 1) {
	sb.append(" (alias ");
	sb.append(aliases.get(0));
	sb.append(")");
	return sb.toString();
	}
	sb.append(" (aliases ");
	for (int i = 0; i< aliases.size(); i ++ ) {
	sb.append(aliases.get(i));
	if (i < aliases.size() -1) {
	sb.append(", ");
	}
	}
	sb.append(")");
	return sb.toString();
	}

	public static List<Command> getCommands() {
	return COMMANDS;
	}

	public static Command valueOf(String commandName) {
	for (Command command : COMMANDS) {
	if (command.getName().equals(commandName)) {
	return command;
	}
	}
	return null;
	}

	public List<String> getOptionSyntax() {
	return Collections.singletonList("");
	}

	public void displayOptionUsage(PrintStream stream) {
	}

	protected boolean acceptOption(Deque<String> options, String expected) throws UserSyntaxException {
	if (expected.equals(options.peek())) {
	if (options.size() < 2) {
	throw new UserSyntaxException("missing value for " + options.peek());
	}
	options.remove();
	return true;
	}
	return false;
	}

	protected void warnForWildcardExpansion(String option, String filter) throws UserDataException {
	// Users should quote their wildcards to avoid expansion by the shell
	try {
	if (!filter.contains(File.pathSeparator)) {
	Path p = Paths.get(".", filter);
	if (!Files.exists(p)) {
	return;
	}
	}
	throw new UserDataException("wildcards should be quoted, for example " + option + " \"Foo*\"");
	} catch (InvalidPathException ipe) {
	// ignore
	}
	}

	protected boolean acceptFilterOption(Deque<String> options, String expected) throws UserSyntaxException {
	if (!acceptOption(options, expected)) {
	return false;
	}
	if (options.isEmpty()) {
	throw new UserSyntaxException("missing filter after " + expected);
	}
	String filter = options.peek();
	if (filter.startsWith("--")) {
	throw new UserSyntaxException("missing filter after " + expected);
	}
	return true;
	}

	final protected void ensureMaxArgumentCount(Deque<String> options, int maxCount) throws UserSyntaxException {
	if (options.size() > maxCount) {
	throw new UserSyntaxException("too many arguments");
	}
	}

	final protected void ensureMinArgumentCount(Deque<String> options, int minCount) throws UserSyntaxException {
	if (options.size() < minCount) {
	throw new UserSyntaxException("too few arguments");
	}
	}

	final protected Path getDirectory(String pathText) throws UserDataException {
	try {
	Path path = Paths.get(pathText).toAbsolutePath();
	if (!Files.exists((path))) {
	throw new UserDataException("directory does not exist, " + pathText);
	}
	if (!Files.isDirectory(path)) {
	throw new UserDataException("path must be directory, " + pathText);
	}
	return path;
	} catch (InvalidPathException ipe) {
	throw new UserDataException("invalid path '" + pathText + "'");
	}
	}

	final protected Path getJFRInputFile(Deque<String> options) throws UserSyntaxException, UserDataException {
	if (options.isEmpty()) {
	throw new UserSyntaxException("missing file");
	}
	String file = options.removeLast();
	if (file.startsWith("--")) {
	throw new UserSyntaxException("missing file");
	}
	try {
	Path path = Paths.get(file).toAbsolutePath();
	ensureAccess(path);
	ensureJFRFile(path);
	return path;
	} catch (IOError ioe) {
	throw new UserDataException("i/o error reading file '" + file + "', " + ioe.getMessage());
	} catch (InvalidPathException ipe) {
	throw new UserDataException("invalid path '" + file + "'");
	}
	}

	private void ensureAccess(Path path) throws UserDataException {
	try (RandomAccessFile rad = new RandomAccessFile(path.toFile(), "r")) {
	if (rad.length() == 0) {
	throw new UserDataException("file is empty '" + path + "'");
	}
	rad.read(); // try to read 1 byte
	} catch (FileNotFoundException e) {
	throw new UserDataException("could not open file " + e.getMessage());
	} catch (IOException e) {
	throw new UserDataException("i/o error reading file '" + path + "', " + e.getMessage());
	}
	}

	final protected void couldNotReadError(Path p, IOException e) throws UserDataException {
	throw new UserDataException("could not read recording at " + p.toAbsolutePath() + ". " + e.getMessage());
	}

	final protected Path ensureFileDoesNotExist(Path file) throws UserDataException {
	if (Files.exists(file)) {
	throw new UserDataException("file '" + file + "' already exists");
	}
	return file;
	}

	final protected void ensureJFRFile(Path path) throws UserDataException {
	if (!path.toString().endsWith(".jfr")) {
	throw new UserDataException("filename must end with '.jfr'");
	}
	}

	protected void displayUsage(PrintStream stream) {
	displayCommand(stream, this);
	stream.println();
	displayOptionUsage(stream);
	}

	final protected void println() {
	System.out.println();
	}

	final protected void print(String text) {
	System.out.print(text);
	}

	final protected void println(String text) {
	System.out.println(text);
	}

	final protected boolean matches(String command) {
	for (String s : getNames()) {
	if (s.equals(command)) {
	return true;
	}
	}
	return false;
	}

	protected List<String> getAliases() {
	return Collections.emptyList();
	}

	public List<String> getNames() {
	List<String> names = new ArrayList<>();
	names.add(getName());
	names.addAll(getAliases());
	return names;
	}
	}

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