/*
    * Copyright (C) 2017 Magnus Vigerlöf (magnus.vigerlof@gmail.com) 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.treewalk.filter;
  
  import static org.junit.Assert.assertEquals;
  
  import java.io.IOException;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collections;
  import java.util.List;
  
  import org.eclipse.jgit.dircache.DirCache;
  import org.eclipse.jgit.dircache.DirCacheBuilder;
  import org.eclipse.jgit.dircache.DirCacheEntry;
  import org.eclipse.jgit.junit.RepositoryTestCase;
  import org.eclipse.jgit.lib.FileMode;
  import org.eclipse.jgit.lib.ObjectId;
  import org.eclipse.jgit.lib.ObjectInserter;
  import org.eclipse.jgit.treewalk.TreeWalk;
  import org.junit.Before;
  import org.junit.Test;
  
  public class PathFilterLogicTest extends RepositoryTestCase {
  
  	private ObjectId treeId;
  
  	@Before
  	public void setup() throws IOException {
  		String[] paths = new String[] {
  				"a.txt",
  				"sub1.txt",
  				"sub1/suba/a.txt",
  				"sub1/subb/b.txt",
  				"sub2/suba/a.txt"
  		};
  		treeId = createTree(paths);
  	}
  
  	@Test
  	public void testSinglePath() throws IOException {
  		List<String> expected = Arrays.asList("sub1/suba/a.txt",
  				"sub1/subb/b.txt");
  
  		TreeFilter tf = PathFilter.create("sub1");
  		List<String> paths = getMatchingPaths(treeId, tf);
  
  		assertEquals(expected, paths);
  	}
  
  	@Test
  	public void testSingleSubPath() throws IOException {
  		List<String> expected = Collections.singletonList("sub1/suba/a.txt");
  
  		TreeFilter tf = PathFilter.create("sub1/suba");
  		List<String> paths = getMatchingPaths(treeId, tf);
  
  		assertEquals(expected, paths);
  	}
  
  	@Test
  	public void testSinglePathNegate() throws IOException {
  		List<String> expected = Arrays.asList("a.txt", "sub1.txt",
  				"sub2/suba/a.txt");
  
  		TreeFilter tf = PathFilter.create("sub1").negate();
  		List<String> paths = getMatchingPaths(treeId, tf);
  
  		assertEquals(expected, paths);
  	}
  
  	@Test
  	public void testSingleSubPathNegate() throws IOException {
  		List<String> expected = Arrays.asList("a.txt", "sub1.txt",
  				"sub1/subb/b.txt", "sub2/suba/a.txt");
  
  		TreeFilter tf = PathFilter.create("sub1/suba").negate();
  		List<String> paths = getMatchingPaths(treeId, tf);
  
  		assertEquals(expected, paths);
  	}
  
  	@Test
  	public void testOrMultiTwoPath() throws IOException {
  		List<String> expected = Arrays.asList("sub1/suba/a.txt",
  				"sub1/subb/b.txt", "sub2/suba/a.txt");
  
  		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
  				PathFilter.create("sub2")};
  		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
  
  		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testOrMultiThreePath() throws IOException {
 		List<String> expected = Arrays.asList("sub1.txt", "sub1/suba/a.txt",
 				"sub1/subb/b.txt", "sub2/suba/a.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
 				PathFilter.create("sub2"), PathFilter.create("sub1.txt")};
 		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testOrMultiTwoSubPath() throws IOException {
 		List<String> expected = Arrays.asList("sub1/subb/b.txt",
 				"sub2/suba/a.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1/subb"),
 				PathFilter.create("sub2/suba")};
 		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testOrMultiTwoMixSubPath() throws IOException {
 		List<String> expected = Arrays.asList("sub1/subb/b.txt",
 				"sub2/suba/a.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1/subb"),
 				PathFilter.create("sub2")};
 		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testOrMultiTwoMixSubPathNegate() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt",
 				"sub1/suba/a.txt", "sub2/suba/a.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1").negate(),
 				PathFilter.create("sub1/suba")};
 		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testOrMultiThreeMixSubPathNegate() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt",
 				"sub1/suba/a.txt", "sub2/suba/a.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1").negate(),
 				PathFilter.create("sub1/suba"), PathFilter.create("no/path")};
 		List<String> paths = getMatchingPaths(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testPatternParentFileMatch() throws IOException {
 		List<String> expected = Collections.emptyList();
 
 		TreeFilter tf = PathFilter.create("a.txt/test/path");
 		List<String> paths = getMatchingPaths(treeId, tf);
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiPath() throws IOException {
 		List<String> expected = Collections.emptyList();
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
 				PathFilter.create("sub2")};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiPathNegate() throws IOException {
 		List<String> expected = Arrays.asList("sub1/suba/a.txt",
 				"sub1/subb/b.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
 				PathFilter.create("sub2").negate()};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiSubPathDualNegate() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt",
 				"sub1/subb/b.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1/suba").negate(),
 				PathFilter.create("sub2").negate()};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiSubPath() throws IOException {
 		List<String> expected = Collections.emptyList();
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
 				PathFilter.create("sub2/suba")};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiSubPathNegate() throws IOException {
 		List<String> expected = Collections.singletonList("sub1/subb/b.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1"),
 				PathFilter.create("sub1/suba").negate()};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testAndMultiThreeSubPathNegate() throws IOException {
 		List<String> expected = Collections.singletonList("sub1/subb/b.txt");
 
 		TreeFilter[] tf = new TreeFilter[]{PathFilter.create("sub1"),
 				PathFilter.create("sub1/suba").negate(),
 				PathFilter.create("no/path").negate()};
 		List<String> paths = getMatchingPaths(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testTopAndMultiPathDualNegate() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1").negate(),
 				PathFilter.create("sub2").negate()};
 		List<String> paths = getMatchingPathsFlat(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testTopAndMultiSubPathDualNegate() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt", "sub1");
 
 		// Filter on 'sub1/suba' is kind of silly for a non-recursive walk.
 		// The result is interesting though as the 'sub1' path should be
 		// returned, due to the fact that there may be hits once the pattern
 		// is tested with one of the leaf paths.
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1/suba").negate(),
 				PathFilter.create("sub2").negate()};
 		List<String> paths = getMatchingPathsFlat(treeId, AndTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testTopOrMultiPathDual() throws IOException {
 		List<String> expected = Arrays.asList("sub1.txt", "sub2");
 
 		TreeFilter[] tf = new TreeFilter[] {PathFilter.create("sub1.txt"),
 				PathFilter.create("sub2")};
 		List<String> paths = getMatchingPathsFlat(treeId, OrTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	@Test
 	public void testTopNotPath() throws IOException {
 		List<String> expected = Arrays.asList("a.txt", "sub1.txt", "sub2");
 
 		TreeFilter tf = PathFilter.create("sub1");
 		List<String> paths = getMatchingPathsFlat(treeId, NotTreeFilter.create(tf));
 
 		assertEquals(expected, paths);
 	}
 
 	private List<String> getMatchingPaths(final ObjectId objId,
 			TreeFilter tf) throws IOException {
 		return getMatchingPaths(objId, tf, true);
 	}
 
 	private List<String> getMatchingPathsFlat(final ObjectId objId,
 			TreeFilter tf) throws IOException {
 		return getMatchingPaths(objId, tf, false);
 	}
 
 	private List<String> getMatchingPaths(final ObjectId objId,
 			TreeFilter tf, boolean recursive) throws IOException {
 		try (TreeWalk tw = new TreeWalk(db)) {
 			tw.setFilter(tf);
 			tw.setRecursive(recursive);
 			tw.addTree(objId);
 
 			List<String> paths = new ArrayList<>();
 			while (tw.next()) {
 				paths.add(tw.getPathString());
 			}
 			return paths;
 		}
 	}
 
 	private ObjectId createTree(String... paths) throws IOException {
 		final ObjectInserter odi = db.newObjectInserter();
 		final DirCache dc = db.readDirCache();
 		final DirCacheBuilder builder = dc.builder();
 		for (String path : paths) {
 			DirCacheEntry entry = createEntry(path, FileMode.REGULAR_FILE);
 			builder.add(entry);
 		}
 		builder.finish();
 		final ObjectId objId = dc.writeTree(odi);
 		odi.flush();
 		return objId;
 	}
 }