/*
 * Copyright (C) 2013, Robin Stocker <robin@nibor.org>
 * 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.lib;

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

import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.junit.Test;

public class RefDatabaseConflictingNamesTest {

	private RefDatabase refDatabase = new RefDatabase() {
		@Override
		public Map<String, Ref> getRefs(String prefix) throws IOException {
			if (ALL.equals(prefix)) {
				Map<String, Ref> existing = new HashMap<>();
				existing.put("refs/heads/a/b", null /* not used */);
				existing.put("refs/heads/q", null /* not used */);
				return existing;
			} else {
				return Collections.emptyMap();
			}
		}

		@Override
		public Ref peel(Ref ref) throws IOException {
			return null;
		}

		@Override
		public RefUpdate newUpdate(String name, boolean detach)
				throws IOException {
			return null;
		}

		@Override
		public RefRename newRename(String fromName, String toName)
				throws IOException {
			return null;
		}

		@Override
		public boolean isNameConflicting(String name) throws IOException {
			return false;
		}

		@Override
		public Ref exactRef(String name) throws IOException {
			return null;
		}

		@Override
		public List<Ref> getAdditionalRefs() throws IOException {
			return null;
		}

		@Override
		public void create() throws IOException {
			// Not needed
		}

		@Override
		public void close() {
			// Not needed
		}
	};

	@Test
	public void testGetConflictingNames() throws IOException {
		// new references cannot replace an existing container
		assertConflictingNames("refs", "refs/heads/a/b", "refs/heads/q");
		assertConflictingNames("refs/heads", "refs/heads/a/b", "refs/heads/q");
		assertConflictingNames("refs/heads/a", "refs/heads/a/b");

		// existing reference is not conflicting
		assertNoConflictingNames("refs/heads/a/b");

		// new references are not conflicting
		assertNoConflictingNames("refs/heads/a/d");
		assertNoConflictingNames("refs/heads/master");

		// existing reference must not be used as a container
		assertConflictingNames("refs/heads/a/b/c", "refs/heads/a/b");
		assertConflictingNames("refs/heads/q/master", "refs/heads/q");
	}

	private void assertNoConflictingNames(String proposed) throws IOException {
		assertTrue("expected conflicting names to be empty", refDatabase
				.getConflictingNames(proposed).isEmpty());
	}

	private void assertConflictingNames(String proposed, String... conflicts)
			throws IOException {
		Set<String> expected = new HashSet<>(Arrays.asList(conflicts));
		assertEquals(expected,
				new HashSet<>(refDatabase.getConflictingNames(proposed)));
	}
}