/*
 * Copyright (C) 2008-2009, Google Inc.
 * 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.
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 * 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
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 * - Redistributions in binary form must reproduce the above
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 *   disclaimer in the documentation and/or other materials provided
 *   with the distribution.
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 *   names of its contributors may be used to endorse or promote
 *   products derived from this software without specific prior
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package org.eclipse.jgit.dircache;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

import java.io.File;

import org.eclipse.jgit.junit.RepositoryTestCase;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.FileMode;
import org.junit.Test;

public class DirCacheBasicTest extends RepositoryTestCase {
	@Test
	public void testReadMissing_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		assertFalse(idx.exists());

		final DirCache dc = db.readDirCache();
		assertNotNull(dc);
		assertEquals(0, dc.getEntryCount());
	}

	@Test
	public void testReadMissing_TempIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "tmp_index");
		assertFalse(idx.exists());

		final DirCache dc = DirCache.read(idx, db.getFS());
		assertNotNull(dc);
		assertEquals(0, dc.getEntryCount());
	}

	@Test
	public void testLockMissing_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		final File lck = new File(db.getDirectory(), "index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());

		final DirCache dc = db.lockDirCache();
		assertNotNull(dc);
		assertFalse(idx.exists());
		assertTrue(lck.exists());
		assertEquals(0, dc.getEntryCount());

		dc.unlock();
		assertFalse(idx.exists());
		assertFalse(lck.exists());
	}

	@Test
	public void testLockMissing_TempIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "tmp_index");
		final File lck = new File(db.getDirectory(), "tmp_index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());

		final DirCache dc = DirCache.lock(idx, db.getFS());
		assertNotNull(dc);
		assertFalse(idx.exists());
		assertTrue(lck.exists());
		assertEquals(0, dc.getEntryCount());

		dc.unlock();
		assertFalse(idx.exists());
		assertFalse(lck.exists());
	}

	@Test
	public void testWriteEmptyUnlock_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		final File lck = new File(db.getDirectory(), "index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());

		final DirCache dc = db.lockDirCache();
		assertEquals(0, lck.length());
		dc.write();
		assertEquals(12 + 20, lck.length());

		dc.unlock();
		assertFalse(idx.exists());
		assertFalse(lck.exists());
	}

	@Test
	public void testWriteEmptyCommit_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		final File lck = new File(db.getDirectory(), "index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());

		final DirCache dc = db.lockDirCache();
		assertEquals(0, lck.length());
		dc.write();
		assertEquals(12 + 20, lck.length());

		assertTrue(dc.commit());
		assertTrue(idx.exists());
		assertFalse(lck.exists());
		assertEquals(12 + 20, idx.length());
	}

	@Test
	public void testWriteEmptyReadEmpty_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		final File lck = new File(db.getDirectory(), "index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());
		{
			final DirCache dc = db.lockDirCache();
			dc.write();
			assertTrue(dc.commit());
			assertTrue(idx.exists());
		}
		{
			final DirCache dc = db.readDirCache();
			assertEquals(0, dc.getEntryCount());
		}
	}

	@Test
	public void testWriteEmptyLockEmpty_RealIndex() throws Exception {
		final File idx = new File(db.getDirectory(), "index");
		final File lck = new File(db.getDirectory(), "index.lock");
		assertFalse(idx.exists());
		assertFalse(lck.exists());
		{
			final DirCache dc = db.lockDirCache();
			dc.write();
			assertTrue(dc.commit());
			assertTrue(idx.exists());
		}
		{
			final DirCache dc = db.lockDirCache();
			assertEquals(0, dc.getEntryCount());
			assertTrue(idx.exists());
			assertTrue(lck.exists());
			dc.unlock();
		}
	}

	@Test
	public void testBuildThenClear() throws Exception {
		final DirCache dc = db.readDirCache();

		final String[] paths = { "a.", "a.b", "a/b", "a0b" };
		final DirCacheEntry[] ents = new DirCacheEntry[paths.length];
		for (int i = 0; i < paths.length; i++) {
			ents[i] = new DirCacheEntry(paths[i]);
			ents[i].setFileMode(FileMode.REGULAR_FILE);
		}

		final DirCacheBuilder b = dc.builder();
		for (int i = 0; i < ents.length; i++)
			b.add(ents[i]);
		b.finish();
		assertFalse(dc.hasUnmergedPaths());

		assertEquals(paths.length, dc.getEntryCount());
		dc.clear();
		assertEquals(0, dc.getEntryCount());
		assertFalse(dc.hasUnmergedPaths());
	}

	@Test
	public void testDetectUnmergedPaths() throws Exception {
		final DirCache dc = db.readDirCache();
		final DirCacheEntry[] ents = new DirCacheEntry[3];

		ents[0] = new DirCacheEntry("a", 1);
		ents[0].setFileMode(FileMode.REGULAR_FILE);
		ents[1] = new DirCacheEntry("a", 2);
		ents[1].setFileMode(FileMode.REGULAR_FILE);
		ents[2] = new DirCacheEntry("a", 3);
		ents[2].setFileMode(FileMode.REGULAR_FILE);

		final DirCacheBuilder b = dc.builder();
		for (int i = 0; i < ents.length; i++)
			b.add(ents[i]);
		b.finish();
		assertTrue(dc.hasUnmergedPaths());
	}

	@Test
	public void testFindOnEmpty() throws Exception {
		final DirCache dc = DirCache.newInCore();
		final byte[] path = Constants.encode("a");
		assertEquals(-1, dc.findEntry(path, path.length));
	}
}
