// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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.google.devtools.build.lib.packages;

import static com.google.common.truth.Truth.assertThat;

import com.google.common.testing.EqualsTester;
import com.google.devtools.build.lib.cmdline.PackageIdentifier;
import com.google.devtools.build.lib.packages.util.PackageLoadingTestCase;
import com.google.devtools.build.lib.vfs.Path;
import org.junit.Before;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public class OutputFileTest extends PackageLoadingTestCase {
  private Package pkg;
  private Rule rule;

  @Before
  public final void createRule() throws Exception {
    Path buildfile =
        scratch.file(
            "pkg/BUILD",
            "genrule(name='foo', ",
            "        srcs=[], ",
            "        cmd='', ",
            "        outs=['x', 'subdir/y'])");
    this.pkg =
        packageFactory.createPackageForTesting(
            PackageIdentifier.createInMainRepo("pkg"), buildfile, getPackageManager(), reporter);
    assertNoEvents();

    this.rule = (Rule) pkg.getTarget("foo");
  }

  private void checkTargetRetainsGeneratingRule(OutputFile output) throws Exception {
    assertThat(output.getGeneratingRule()).isSameAs(rule);
  }

  private void checkName(OutputFile output, String expectedName) throws Exception {
    assertThat(output.getName()).isEqualTo(expectedName);
  }

  private void checkLabel(OutputFile output, String expectedLabelString) throws Exception {
    assertThat(output.getLabel().toString()).isEqualTo(expectedLabelString);
  }

  @Test
  public void testGetAssociatedRule() throws Exception {
    assertThat(pkg.getTarget("x").getAssociatedRule()).isSameAs(rule);
  }

  @Test
  public void testOutputFileInPackageDir() throws Exception {
    OutputFile outputFileX = (OutputFile) pkg.getTarget("x");
    checkTargetRetainsGeneratingRule(outputFileX);
    checkName(outputFileX, "x");
    checkLabel(outputFileX, "//pkg:x");
    assertThat(outputFileX.getTargetKind()).isEqualTo("generated file");
  }

  @Test
  public void testOutputFileInSubdirectory() throws Exception {
    OutputFile outputFileY = (OutputFile) pkg.getTarget("subdir/y");
    checkTargetRetainsGeneratingRule(outputFileY);
    checkName(outputFileY, "subdir/y");
    checkLabel(outputFileY, "//pkg:subdir/y");
  }

  @Test
  public void testEquivalenceRelation() throws Exception {
    OutputFile outputFileX1 = (OutputFile) pkg.getTarget("x");
    OutputFile outputFileX2 = (OutputFile) pkg.getTarget("x");
    OutputFile outputFileY1 = (OutputFile) pkg.getTarget("subdir/y");
    OutputFile outputFileY2 = (OutputFile) pkg.getTarget("subdir/y");
    assertThat(outputFileX2).isSameAs(outputFileX1);
    assertThat(outputFileY2).isSameAs(outputFileY1);
    new EqualsTester()
        .addEqualityGroup(outputFileX1, outputFileX2)
        .addEqualityGroup(outputFileY1, outputFileY2)
        .testEquals();
  }

  @Test
  public void testDuplicateOutputFilesInDifferentRules() throws Exception {
    Path buildfile =
        scratch.file(
            "two_outs/BUILD",
            "genrule(name='a',",
            "        cmd='ls >$(location out)',",
            "        outs=['out'])",
            "",
            "genrule(name='b',",
            "        cmd='ls >$(location out)',",
            "        outs=['out'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("two_outs"),
        buildfile,
        getPackageManager(),
        reporter);
    assertContainsEvent(
        "generated file 'out' in rule 'b' conflicts with "
            + "existing generated file from rule 'a'");
  }

  @Test
  public void testOutputFileNameConflictsWithExistingRule() throws Exception {
    Path buildfile =
        scratch.file(
            "out_is_rule/BUILD",
            "genrule(name='a',",
            "        cmd='ls >$(location out)',",
            "        outs=['out'])",
            "",
            "genrule(name='b',",
            "        cmd='ls >$(location out)',",
            "        outs=['a'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("out_is_rule"),
        buildfile,
        getPackageManager(),
        reporter);
    assertContainsEvent("generated file 'a' in rule 'b' conflicts with existing genrule rule");
  }

  @Test
  public void testDuplicateOutputFilesInSameRule() throws Exception {
    Path buildfile =
        scratch.file(
            "two_outs/BUILD",
            "genrule(name='a',",
            "        cmd='ls >$(location out)',",
            "        outs=['out', 'out'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("two_outs"),
        buildfile,
        getPackageManager(),
        reporter);
    assertContainsEvent(
        "generated file 'out' in rule 'a' conflicts with "
            + "existing generated file from rule 'a'");
  }

  @Test
  public void testOutputFileWithIllegalName() throws Exception {
    Path buildfile =
        scratch.file(
            "bad_out_name/BUILD",
            "genrule(name='a',",
            "        cmd='ls',",
            "        outs=['!@#:'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("bad_out_name"),
        buildfile,
        getPackageManager(),
        reporter);
    assertContainsEvent("illegal output file name '!@#:' in rule //bad_out_name:a");
  }

  @Test
  public void testOutputFileWithCrossPackageLabel() throws Exception {
    Path buildfile =
        scratch.file(
            "cross_package_out/BUILD",
            "genrule(name='a',",
            "        cmd='ls',",
            "        outs=['//foo:bar'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("cross_package_out"),
        buildfile,
        getPackageManager(),
        reporter);
    assertContainsEvent("label '//foo:bar' is not in the current package");
  }

  @Test
  public void testOutputFileNamedBUILD() throws Exception {
    Path buildfile =
        scratch.file(
            "output_called_build/BUILD",
            "genrule(name='a',",
            "        cmd='ls',",
            "        outs=['BUILD'])");

    reporter.removeHandler(failFastHandler);
    packageFactory.createPackageForTesting(
        PackageIdentifier.createInMainRepo("output_called_build"), buildfile,
        getPackageManager(), reporter);
    assertContainsEvent("generated file 'BUILD' in rule 'a' conflicts with existing source file");
  }
}