/*
 * 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.rules;

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

import com.facebook.buck.model.BuildTarget;
import com.facebook.buck.model.BuildTargetFactory;
import com.facebook.buck.util.HumanReadableException;
import java.nio.file.Path;
import java.nio.file.Paths;
import org.junit.Test;

public class DefaultBuildTargetSourcePathTest {

  private BuildTarget target = BuildTargetFactory.newInstance("//example:target");

  @Test
  public void shouldThrowAnExceptionIfRuleDoesNotHaveAnOutput() {
    BuildRuleResolver resolver =
        new BuildRuleResolver(TargetGraph.EMPTY, new DefaultTargetNodeToBuildRuleTransformer());
    SourcePathResolver pathResolver = new SourcePathResolver(new SourcePathRuleFinder(resolver));
    FakeBuildRule rule = new FakeBuildRule(target, pathResolver);
    rule.setOutputFile(null);
    resolver.addToIndex(rule);
    SourcePath path = new DefaultBuildTargetSourcePath(target);

    try {
      pathResolver.getRelativePath(path);
      fail();
    } catch (HumanReadableException e) {
      assertEquals("No known output for: " + target.getFullyQualifiedName(), e.getMessage());
    }
  }

  @Test
  public void mustUseProjectFilesystemToResolvePathToFile() {
    BuildRuleResolver resolver =
        new BuildRuleResolver(TargetGraph.EMPTY, new DefaultTargetNodeToBuildRuleTransformer());
    SourcePathResolver pathResolver = new SourcePathResolver(new SourcePathRuleFinder(resolver));
    FakeBuildRule rule = new FakeBuildRule(target, pathResolver);
    rule.setOutputFile("cheese");
    resolver.addToIndex(rule);

    SourcePath path = rule.getSourcePathToOutput();

    Path resolved = pathResolver.getRelativePath(path);

    assertEquals(Paths.get("cheese"), resolved);
  }

  @Test
  public void shouldReturnTheBuildTarget() {
    BuildTarget target = BuildTargetFactory.newInstance("//foo/bar:baz");
    DefaultBuildTargetSourcePath path = new DefaultBuildTargetSourcePath(target);

    assertEquals(target, path.getTarget());
  }
}