// Copyright 2018 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.query2.engine;

import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.build.lib.packages.Attribute.attr;
import static com.google.devtools.build.lib.packages.BuildType.LABEL;
import static com.google.devtools.build.lib.packages.BuildType.LABEL_LIST;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.config.BuildConfiguration;
import com.google.devtools.build.lib.analysis.config.BuildOptions;
import com.google.devtools.build.lib.analysis.config.HostTransition;
import com.google.devtools.build.lib.analysis.config.transitions.SplitTransition;
import com.google.devtools.build.lib.analysis.test.TestConfiguration.TestOptions;
import com.google.devtools.build.lib.analysis.util.MockRule;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.packages.BuildType;
import com.google.devtools.build.lib.query2.ConfiguredTargetQueryEnvironment;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryFunction;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Setting;
import com.google.devtools.build.lib.util.FileTypeSet;
import com.google.devtools.build.lib.vfs.Path;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link ConfiguredTargetQueryEnvironment}.
 * TODO(juliexxia): separate out tests in this file into one test per tested functionality.
 */
@RunWith(JUnit4.class)
public class ConfiguredTargetQueryTest extends PostAnalysisQueryTest<ConfiguredTarget> {

  @Override
  protected QueryHelper<ConfiguredTarget> createQueryHelper() {
    if (helper != null) {
      getHelper().cleanUp();
    }
    helper = new ConfiguredTargetQueryHelper();
    return helper;
  }

  @Override
  public HashMap<String, QueryFunction> getDefaultFunctions() {
    ImmutableList<QueryFunction> defaultFunctions =
        ImmutableList.copyOf(ConfiguredTargetQueryEnvironment.FUNCTIONS);
    HashMap<String, QueryFunction> functions = new HashMap<>();
    for (QueryFunction queryFunction : defaultFunctions) {
      functions.put(queryFunction.getName(), queryFunction);
    }
    return functions;
  }

  @Override
  protected final BuildConfiguration getConfiguration(ConfiguredTarget ct) {
    return getHelper()
        .getSkyframeExecutor()
        .getConfiguration(getHelper().reporter, ct.getConfigurationKey());
  }

  @Test
  public void testConfigurationRespected() throws Exception {
    writeBuildFilesWithConfigurableAttributesUnconditionally();
    assertThat(eval("deps(//configurable:main) ^ //configurable:adep")).isEmpty();
    assertThat(eval("deps(//configurable:main) ^ //configurable:defaultdep")).hasSize(1);
  }

  private void setUpLabelsFunctionTests() throws Exception {
    MockRule ruleWithTransitions =
        () ->
            MockRule.define(
                "rule_with_transitions",
                attr("patch_dep", LABEL)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .cfg(new TestArgPatchTransition("SET BY PATCH")),
                attr("split_dep", LABEL)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .cfg(new TestArgSplitTransition("SET BY SPLIT 1", "SET BY SPLIT 2")),
                attr("patch_dep_list", LABEL_LIST)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .cfg(new TestArgPatchTransition("SET BY PATCH 2")));
    MockRule noAttributeRule = () -> MockRule.define("no_attribute_rule");

    helper.useRuleClassProvider(
        setRuleClassProviders(ruleWithTransitions, noAttributeRule).build());

    writeFile(
        "test/BUILD",
        "rule_with_transitions(name = 'my_rule',",
        "  patch_dep = ':dep-1',",
        "  split_dep = ':dep-2',",
        "  patch_dep_list = [':dep-3', ':dep-4']",
        ")",
        "no_attribute_rule(name = 'dep-1')",
        "no_attribute_rule(name = 'dep-2')",
        "no_attribute_rule(name = 'dep-3')",
        "no_attribute_rule(name = 'dep-4')");

    helper.setUniverseScope("//test:*");
  }

  @Test
  public void testLabelFunction_getsCorrectConfigurations() throws Exception {
    setUpLabelsFunctionTests();

    // (Test that you can use the labels function without an error (b/112593112)).
    // Note - 'labels' as a command for cquery is a slight misnomer since it always prints
    // labels AND configurations. But still a helpful function so oh well.
    assertThat(Iterables.getOnlyElement(eval("labels('patch_dep', //test:my_rule)"))).isNotNull();
  }

  @Test
  public void testLabelFunction_getCorrectlyConfiguredDeps() throws Exception {
    setUpLabelsFunctionTests();

    // Test that this retrieves the correctly configured version(s) of the dep(s).
    ConfiguredTarget patchDep =
        Iterables.getOnlyElement(eval("labels('patch_dep', //test:my_rule)"));
    ConfiguredTarget myRule = Iterables.getOnlyElement(eval("//test:my_rule"));
    String targetConfiguration = myRule.getConfigurationChecksum();
    assertThat(patchDep.getConfigurationChecksum()).doesNotMatch(targetConfiguration);
  }

  @Test
  public void testLabelsFunction_splitTransitionAttribute() throws Exception {
    setUpLabelsFunctionTests();

    ConfiguredTarget myRule = Iterables.getOnlyElement(eval("//test:my_rule"));
    String targetConfiguration = myRule.getConfigurationChecksum();

    Collection<ConfiguredTarget> splitDeps = eval("labels('split_dep', //test:my_rule)");
    assertThat(splitDeps).hasSize(2);
    for (ConfiguredTarget ct : splitDeps) {
      assertThat(ct.getConfigurationChecksum()).doesNotMatch(targetConfiguration);
    }
  }

  @Test
  public void testLabelsFunction_labelListAttribute() throws Exception {
    setUpLabelsFunctionTests();

    ConfiguredTarget myRule = Iterables.getOnlyElement(eval("//test:my_rule"));
    String targetConfiguration = myRule.getConfigurationChecksum();

    // Test that this works for label_lists as well.
    Set<ConfiguredTarget> deps = eval("labels('patch_dep_list', //test:my_rule)");
    assertThat(deps).hasSize(2);
    for (ConfiguredTarget ct : deps) {
      assertThat(ct.getConfigurationChecksum()).doesNotMatch(targetConfiguration);
    }
  }

  @Test
  public void testLabelsFunction_errorsOnBadAttribute() throws Exception {
    setUpLabelsFunctionTests();

    ConfiguredTarget myRule = Iterables.getOnlyElement(eval("//test:my_rule"));
    String targetConfiguration = myRule.getConfigurationChecksum();

    // Test that the proper error is thrown when requesting an attribute that doesn't exist.
    assertThat(evalThrows("labels('fake_attr', //test:my_rule)", true))
        .isEqualTo(
            String.format(
                "in 'fake_attr' of rule //test:my_rule:  ConfiguredTarget(//test:my_rule, %s) "
                    + "of type rule_with_transitions does not have attribute 'fake_attr'",
                targetConfiguration));
  }

  @Test
  public void testAlias_filtering() throws Exception {
    MockRule ruleWithHostDep =
        () ->
            MockRule.define(
                "rule_with_host_dep",
                attr("host_dep", LABEL)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .cfg(HostTransition.INSTANCE),
                attr("$impl_dep", LABEL)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .value(Label.parseAbsoluteUnchecked("//test:other")));
    MockRule simpleRule = () -> MockRule.define("simple_rule");

    helper.useRuleClassProvider(setRuleClassProviders(ruleWithHostDep, simpleRule).build());
    writeFile(
        "test/BUILD",
        "alias(name = 'other_my_rule', actual = ':my_rule')",
        "rule_with_host_dep(name = 'my_rule', host_dep = ':host_dep')",
        "alias(name = 'other_host_dep', actual = ':host_dep')",
        "simple_rule(name='host_dep')",
        "alias(name = 'other_impl_dep', actual = 'impl_dep')",
        "simple_rule(name='impl_dep')");

    ConfiguredTarget other = Iterables.getOnlyElement(eval("//test:other_my_rule"));
    ConfiguredTarget myRule = Iterables.getOnlyElement(eval("//test:my_rule"));
    // Note: {@link AliasConfiguredTarget#getLabel} returns the label of the "actual" value not the
    // label of the alias.
    assertThat(other.getLabel()).isEqualTo(myRule.getLabel());

    // Regression test for b/73496081 in which alias-ed configured targets were skipping filtering.
    helper.setQuerySettings(Setting.NO_HOST_DEPS, Setting.NO_IMPLICIT_DEPS);
    assertThat(evalToListOfStrings("deps(//test:other_my_rule)-//test:other_my_rule"))
        .isEqualTo(evalToListOfStrings("//test:my_rule"));
  }

  @Test
  public void testTopLevelTransition() throws Exception {
    MockRule ruleClassTransition =
        () ->
            MockRule.define(
                "rule_class_transition",
                (builder, env) -> builder.cfg(new TestArgPatchTransition("SET BY PATCH")).build());

    helper.useRuleClassProvider(setRuleClassProviders(ruleClassTransition).build());
    helper.setUniverseScope("//test:rule_class");

    writeFile("test/BUILD", "rule_class_transition(name='rule_class')");

    Set<ConfiguredTarget> ruleClass = eval("//test:rule_class");
    TestOptions testOptions =
        getConfiguration(Iterables.getOnlyElement(ruleClass)).getOptions().get(TestOptions.class);
    assertThat(testOptions.testArguments).containsExactly("SET BY PATCH");
  }

  /** SplitTransition on --test_arg */
  public static class TestArgSplitTransition implements SplitTransition {
    String toOption1;
    String toOption2;

    public TestArgSplitTransition(String toOption1, String toOptions2) {
      this.toOption1 = toOption1;
      this.toOption2 = toOptions2;
    }

    @Override
    public List<BuildOptions> split(BuildOptions options) {
      BuildOptions result1 = options.clone();
      BuildOptions result2 = options.clone();
      result1.get(TestOptions.class).testArguments = Collections.singletonList(toOption1);
      result2.get(TestOptions.class).testArguments = Collections.singletonList(toOption2);
      return ImmutableList.of(result1, result2);
    }
  }

  private void createConfigRulesAndBuild() throws Exception {
    MockRule ruleWithTransitions =
        () ->
            MockRule.define(
                "my_rule",
                attr("target", LABEL).allowedFileTypes(FileTypeSet.ANY_FILE),
                attr("host", LABEL)
                    .allowedFileTypes(FileTypeSet.ANY_FILE)
                    .cfg(HostTransition.INSTANCE),
                attr("deps", BuildType.LABEL_LIST).allowedFileTypes(FileTypeSet.ANY_FILE));
    MockRule simpleRule =
        () ->
            MockRule.define(
                "simple_rule", attr("dep", LABEL).allowedFileTypes(FileTypeSet.ANY_FILE));
    helper.useRuleClassProvider(setRuleClassProviders(ruleWithTransitions, simpleRule).build());

    writeFile(
        "test/BUILD",
        "my_rule(",
        "  name = 'my_rule',",
        "  target = ':target_dep',",
        "  host = ':host_dep',",
        "  deps = [':dep'],",
        ")",
        "simple_rule(name = 'target_dep', dep=':dep')",
        "simple_rule(name = 'host_dep', dep=':dep')",
        "simple_rule(name = 'dep')");
  }

  @Test
  public void testConfig() throws Exception {
    createConfigRulesAndBuild();

    assertThat(eval("config(//test:target_dep,target)")).isEqualTo(eval("//test:target_dep"));
    assertThat(evalThrows("config(//test:target_dep,host)", true))
        .isEqualTo("No target (in) //test:target_dep could be found in the 'host' configuration");

    getHelper().setWholeTestUniverseScope("test:my_rule");

    assertThat(
            getConfiguration(Iterables.getOnlyElement(eval("config(//test:host_dep, host)")))
                .isHostConfiguration())
        .isTrue();

    assertThat(
            getConfiguration(Iterables.getOnlyElement(eval("config(//test:dep, host)")))
                .isHostConfiguration())
        .isTrue();

    assertThat(getConfiguration(Iterables.getOnlyElement(eval("config(//test:dep, target)"))))
        .isNotNull();
    assertThat(
            getConfiguration(Iterables.getOnlyElement(eval("config(//test:dep, target)")))
                .isHostConfiguration())
        .isFalse();
  }

  @Test
  public void testConfig_nullConfig() throws Exception {
    writeFile("test/BUILD", "java_library(name='my_java',", "  srcs = ['foo.java'],", ")");

    assertThat(getConfiguration(Iterables.getOnlyElement(eval("config(//test:foo.java,null)"))))
        .isNull();
  }

  @Test
  public void testConfig_badConfig() throws Exception {
    createConfigRulesAndBuild();
    assertThat(evalThrows("config(//test:my_rule,foo)", true))
        .isEqualTo(
            "the second argument of the config function must be 'target', 'host', or 'null'");
  }

  @Test
  public void testRecursiveTargetPatternNeverThrowsError() throws Exception {
    Path parent =
        getHelper()
            .getScratch()
            .file("parent/BUILD", "sh_library(name = 'parent')")
            .getParentDirectory();
    Path child = parent.getRelative("child");
    child.createDirectory();
    Path badBuild = child.getRelative("BUILD");
    badBuild.createSymbolicLink(badBuild);

    helper.setKeepGoing(true);
    assertThat(eval("//parent:all")).isEqualTo(eval("//parent:parent"));

    helper.setKeepGoing(false);
    getHelper().turnOffFailFast();
    assertThat(evalThrows("//parent/...", true))
        .isEqualTo(
            "no such package 'parent/child': Symlink cycle detected while trying to "
                + "find BUILD file /workspace/parent/child/BUILD");
  }

  @Override
  @Test
  public void testMultipleTopLevelConfigurations_nullConfigs() throws Exception {
    writeFile("test/BUILD", "java_library(name='my_java',", "  srcs = ['foo.java'],", ")");

    Set<ConfiguredTarget> result = eval("//test:my_java+//test:foo.java");

    assertThat(result).hasSize(2);

    Iterator<ConfiguredTarget> resultIterator = result.iterator();
    ConfiguredTarget first = resultIterator.next();
    if (first.getLabel().toString().equals("//test:foo.java")) {
      assertThat(getConfiguration(first)).isNull();
      assertThat(getConfiguration(resultIterator.next())).isNotNull();
    } else {
      assertThat(getConfiguration(first)).isNotNull();
      assertThat(getConfiguration(resultIterator.next())).isNull();
    }
  }
}