/*
    * Copyright (C) 2008, Jonas Fonseca <fonseca@diku.dk>
    * Copyright (C) 2008, Shawn O. Pearce <spearce@spearce.org> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
   */
  
  package org.eclipse.jgit.pgm;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.eclipse.jgit.lib.FileMode;
  import org.eclipse.jgit.pgm.opt.PathTreeFilterHandler;
  import org.eclipse.jgit.treewalk.AbstractTreeIterator;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.eclipse.jgit.treewalk.filter.AndTreeFilter;
  import org.eclipse.jgit.treewalk.filter.TreeFilter;
  import org.kohsuke.args4j.Argument;
  import org.kohsuke.args4j.Option;
  
  @Command(usage = "usage_ShowDiffTree")
  class DiffTree extends TextBuiltin {
  	@Option(name = "--recursive", usage = "usage_recurseIntoSubtrees", aliases = { "-r" })
  	private boolean recursive;
  
  	@Argument(index = 0, metaVar = "metaVar_treeish", required = true)
  	void tree_0(final AbstractTreeIterator c) {
  		trees.add(c);
  	}
  
  	@Argument(index = 1, metaVar = "metaVar_treeish", required = true)
  	private List<AbstractTreeIterator> trees = new ArrayList<>();
  
  	@Option(name = "--", metaVar = "metaVar_path", handler = PathTreeFilterHandler.class)
  	private TreeFilter pathFilter = TreeFilter.ALL;
  
  	/** {@inheritDoc} */
  	@Override
  	protected void run() {
  		try (TreeWalkeeWalk.html#TreeWalk">TreeWalk walk = new TreeWalk(db)) {
  			walk.setRecursive(recursive);
  			for (AbstractTreeIterator i : trees)
  				walk.addTree(i);
  			walk.setFilter(AndTreeFilter.create(TreeFilter.ANY_DIFF, pathFilter));
  
  			final int nTree = walk.getTreeCount();
  			while (walk.next()) {
  				for (int i = 1; i < nTree; i++) {
  					outw.print(':');
  				}
  				for (int i = 0; i < nTree; i++) {
  					final FileMode m = walk.getFileMode(i);
  					final String s = m.toString();
  					for (int pad = 6 - s.length(); pad > 0; pad--) {
  						outw.print('0');
  					}
  					outw.print(s);
  					outw.print(' ');
  				}
  
  				for (int i = 0; i < nTree; i++) {
  					outw.print(walk.getObjectId(i).name());
  					outw.print(' ');
  				}
  
  				char chg = 'M';
  				if (nTree == 2) {
  					final int m0 = walk.getRawMode(0);
  					final int m1 = walk.getRawMode(1);
  					if (m0 == 0 && m1 != 0) {
  						chg = 'A';
  					} else if (m0 != 0 && m1 == 0) {
  						chg = 'D';
  					} else if (m0 != m1 && walk.idEqual(0, 1)) {
  						chg = 'T';
  					}
  				}
  				outw.print(chg);
  
  				outw.print('\t');
  				outw.print(walk.getPathString());
  				outw.println();
  			}
  		} catch (IOException e) {
  			throw die(e.getMessage(), e);
  		}
  	}
  }