/*
 * Copyright 2013-present Facebook, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License. You may obtain
 * a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package com.facebook.buck.util;

import static com.facebook.buck.testutil.WatchEvents.createOverflowEvent;
import static com.facebook.buck.testutil.WatchEvents.createPathEvent;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertTrue;

import com.facebook.buck.testutil.TestConsole;
import com.google.common.hash.HashCode;

import org.junit.Test;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.StandardWatchEventKinds;

public class ConcurrentMapFileHashCacheTest {

  @Test
  public void whenPathIsPutCacheContainsPath() {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    Path path = new File("SomeClass.java").toPath();
    cache.loadingCache.put(path, HashCode.fromInt(42));
    assertTrue("Cache should contain path", cache.contains(path));
  }

  @Test
  public void whenPathIsPutPathGetReturnsHash() {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    Path path = new File("SomeClass.java").toPath();
    HashCode hash = HashCode.fromInt(42);
    cache.loadingCache.put(path, hash);
    assertEquals("Cache should contain hash", hash, cache.get(path));
  }

  @Test
  public void whenNotifiedOfOverflowEventCacheIsCleared() throws IOException {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    Path path = new File("SomeClass.java").toPath();
    HashCode hash = HashCode.fromInt(42);
    cache.loadingCache.put(path, hash);
    cache.onFileSystemChange(createOverflowEvent());
    assertFalse("Cache should not contain path", cache.contains(path));
  }

  @Test
  public void whenNotifiedOfCreateEventCacheEntryIsRemoved() throws IOException {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    File file = new File("SomeClass.java");
    Path path = file.toPath();
    HashCode hash = HashCode.fromInt(42);
    cache.loadingCache.put(path, hash);
    cache.onFileSystemChange(createPathEvent(file, StandardWatchEventKinds.ENTRY_CREATE));
    assertFalse("Cache should not contain path", cache.contains(path));
  }

  @Test
  public void whenNotifiedOfChangeEventCacheEntryIsRemoved() throws IOException {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    File file = new File("SomeClass.java");
    Path path = file.toPath();
    HashCode hash = HashCode.fromInt(42);
    cache.loadingCache.put(path, hash);
    cache.onFileSystemChange(createPathEvent(file, StandardWatchEventKinds.ENTRY_MODIFY));
    assertFalse("Cache should not contain path", cache.contains(path));
  }

  @Test
  public void whenNotifiedOfDeleteEventCacheEntryIsRemoved() throws IOException {
    DefaultFileHashCache cache = new DefaultFileHashCache(new ProjectFilesystem(new File(".")), new TestConsole());
    File file = new File("SomeClass.java");
    Path path = file.toPath();
    HashCode hash = HashCode.fromInt(42);
    cache.loadingCache.put(path, hash);
    cache.onFileSystemChange(createPathEvent(file, StandardWatchEventKinds.ENTRY_DELETE));
    assertFalse("Cache should not contain path", cache.contains(path));
  }
}