/*
    * Copyright (C) 2017, Matthias Sohn <matthias.sohn@sap.com>
    * and other copyright owners as documented in the project's IP log.
    *
    * This program and the accompanying materials are made available
    * under the terms of the Eclipse Distribution License v1.0 which
    * accompanies this distribution, is reproduced below, and is
    * available at http://www.eclipse.org/org/documents/edl-v10.php
    *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or
   * without modification, are permitted provided that the following
   * conditions are met:
   *
   * - Redistributions of source code must retain the above copyright
   *   notice, this list of conditions and the following disclaimer.
   *
   * - Redistributions in binary form must reproduce the above
   *   copyright notice, this list of conditions and the following
   *   disclaimer in the documentation and/or other materials provided
   *   with the distribution.
   *
   * - Neither the name of the Eclipse Foundation, Inc. nor the
   *   names of its contributors may be used to endorse or promote
   *   products derived from this software without specific prior
   *   written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
   * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
   * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
   * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package org.eclipse.jgit.pgm;
  
  import static java.util.function.Predicate.isEqual;
  import static org.eclipse.jgit.lib.FileMode.EXECUTABLE_FILE;
  import static org.eclipse.jgit.lib.FileMode.GITLINK;
  import static org.eclipse.jgit.lib.FileMode.REGULAR_FILE;
  import static org.eclipse.jgit.lib.FileMode.SYMLINK;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.List;
  
  import org.eclipse.jgit.dircache.DirCacheIterator;
  import org.eclipse.jgit.errors.RevisionSyntaxException;
  import org.eclipse.jgit.lib.Constants;
  import org.eclipse.jgit.lib.FileMode;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.revwalk.RevCommit;
  import org.eclipse.jgit.revwalk.RevWalk;
  import org.eclipse.jgit.treewalk.CanonicalTreeParser;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.eclipse.jgit.treewalk.filter.PathFilterGroup;
  import org.eclipse.jgit.util.QuotedString;
  import org.kohsuke.args4j.Option;
  import org.kohsuke.args4j.spi.StopOptionHandler;
  
  @Command(common = true, usage = "usage_LsFiles")
  class LsFiles extends TextBuiltin {
  
  	@Option(name = "--", metaVar = "metaVar_paths", handler = StopOptionHandler.class)
  	private List<String> paths = new ArrayList<>();
  
  	@Override
  	protected void run() {
  		try (RevWalk rw = new RevWalk(db);
  				TreeWalk tw = new TreeWalk(db)) {
  			final ObjectId head = db.resolve(Constants.HEAD);
  			if (head == null) {
  				return;
  			}
  			RevCommit c = rw.parseCommit(head);
  			CanonicalTreeParser p = new CanonicalTreeParser();
  			p.reset(rw.getObjectReader(), c.getTree());
  			tw.reset(); // drop the first empty tree, which we do not need here
  			if (!paths.isEmpty()) {
  				tw.setFilter(PathFilterGroup.createFromStrings(paths));
  			}
  			tw.addTree(p);
  			tw.addTree(new DirCacheIterator(db.readDirCache()));
  			tw.setRecursive(true);
  			while (tw.next()) {
  				if (filterFileMode(tw, EXECUTABLE_FILE, GITLINK, REGULAR_FILE,
  						SYMLINK)) {
  					outw.println(
  							QuotedString.GIT_PATH.quote(tw.getPathString()));
  				}
 			}
 		} catch (RevisionSyntaxException | IOException e) {
 			throw die(e.getMessage(), e);
 		}
 	}
 
 	private boolean filterFileMode(TreeWalk tw, FileMode... modes) {
 		return Arrays.stream(modes).anyMatch(isEqual(tw.getFileMode(0))
 				.or(isEqual(tw.getFileMode(1))));
 	}
 }