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package org.spearce.jgit.treewalk;

import org.spearce.jgit.lib.FileMode;
import org.spearce.jgit.lib.ObjectId;
import org.spearce.jgit.lib.ObjectWriter;
import org.spearce.jgit.lib.RepositoryTestCase;
import org.spearce.jgit.lib.Tree;
import org.spearce.jgit.treewalk.filter.TreeFilter;

public class TreeWalkBasicDiffTest extends RepositoryTestCase {
	public void testMissingSubtree_DetectFileAdded_FileModified()
			throws Exception {
		final ObjectWriter ow = new ObjectWriter(db);
		final ObjectId aFileId = ow.writeBlob("a".getBytes());
		final ObjectId bFileId = ow.writeBlob("b".getBytes());
		final ObjectId cFileId1 = ow.writeBlob("c-1".getBytes());
		final ObjectId cFileId2 = ow.writeBlob("c-2".getBytes());

		// Create sub-a/empty, sub-c/empty = hello.
		final ObjectId oldTree;
		{
			final Tree root = new Tree(db);
			{
				final Tree subA = root.addTree("sub-a");
				subA.addFile("empty").setId(aFileId);
				subA.setId(ow.writeTree(subA));
			}
			{
				final Tree subC = root.addTree("sub-c");
				subC.addFile("empty").setId(cFileId1);
				subC.setId(ow.writeTree(subC));
			}
			oldTree = ow.writeTree(root);
		}

		// Create sub-a/empty, sub-b/empty, sub-c/empty.
		final ObjectId newTree;
		{
			final Tree root = new Tree(db);
			{
				final Tree subA = root.addTree("sub-a");
				subA.addFile("empty").setId(aFileId);
				subA.setId(ow.writeTree(subA));
			}
			{
				final Tree subB = root.addTree("sub-b");
				subB.addFile("empty").setId(bFileId);
				subB.setId(ow.writeTree(subB));
			}
			{
				final Tree subC = root.addTree("sub-c");
				subC.addFile("empty").setId(cFileId2);
				subC.setId(ow.writeTree(subC));
			}
			newTree = ow.writeTree(root);
		}

		final TreeWalk tw = new TreeWalk(db);
		tw.reset(new ObjectId[] { oldTree, newTree });
		tw.setRecursive(true);
		tw.setFilter(TreeFilter.ANY_DIFF);

		assertTrue(tw.next());
		assertEquals("sub-b/empty", tw.getPathString());
		assertEquals(FileMode.MISSING, tw.getFileMode(0));
		assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(1));
		assertEquals(ObjectId.zeroId(), tw.getObjectId(0));
		assertEquals(bFileId, tw.getObjectId(1));

		assertTrue(tw.next());
		assertEquals("sub-c/empty", tw.getPathString());
		assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(0));
		assertEquals(FileMode.REGULAR_FILE, tw.getFileMode(1));
		assertEquals(cFileId1, tw.getObjectId(0));
		assertEquals(cFileId2, tw.getObjectId(1));

		assertFalse(tw.next());
	}
}