// Copyright 2020 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.buildtool;

import static com.google.common.truth.Truth.assertThat;
import static com.google.devtools.build.lib.rules.python.PythonTestUtils.getPyLoad;
import static org.junit.Assert.assertThrows;

import com.google.devtools.build.lib.actions.BuildFailedException;
import com.google.devtools.build.lib.buildtool.util.BuildIntegrationTestCase;
import com.google.devtools.build.lib.events.EventCollector;
import com.google.devtools.build.lib.events.EventKind;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Test the semantics of the compile_one_dependency flag: for each command-line argument (which must
 * be a source file path relative to the workspace) rebuild a single target that depends on it.
 */
@RunWith(JUnit4.class)
public class CompileOneDependencyIntegrationTest extends BuildIntegrationTestCase {

  @Test
  public void testPyBinaryMember() throws Exception {
    EventCollector eventCollector = new EventCollector(EventKind.START);
    events.addHandler(eventCollector);
    addOptions("--compile_one_dependency");
    // Make build super minimal.
    addOptions("--nobuild_runfile_links");
    write(
        "package/BUILD", //
        getPyLoad("py_binary"),
        "py_binary(name='foo', srcs=['foo.py'])");
    write("package/foo.py");
    buildTarget("package/foo.py");

    assertContainsEvent(eventCollector, "Creating source manifest for //package:foo");
  }

  /**
   * Regression test for b/13394215: --compile_one_dependency with --keep_going not working in
   * skyframe.
   */
  @Test
  public void testBadPackage() throws Exception {
    addOptions("--compile_one_dependency", "--keep_going");

    write(
        "package/BUILD",
        """
        cc_binary(
            name = "foo",
            srcs = ["foo.cc"],
            malloc = "//base:system_malloc",
        )

        invalidbuildsyntax
        """);
    write(
        "package/foo.cc",
        "#include <stdio.h>",
        "int main() {",
        "  printf(\"Hello, world!\\n\");",
        "  return 0;",
        "}");
    BuildFailedException e =
        assertThrows(BuildFailedException.class, () -> buildTarget("package/foo.cc"));
    assertThat(e)
        .hasMessageThat()
        .contains("command succeeded, but there were errors parsing the target pattern");
  }

  @Test
  public void testTransitiveRdepFromSourceFileViaChainOfFilegroupsThatGoesThroughPackageInError()
      throws Exception {
    addOptions("--compile_one_dependency", "--keep_going", "--noanalyze");

    write(
        "package/BUILD",
        """
        exports_files(["foo.cc"])

        cc_binary(
            name = "foo",
            srcs = ["fg"],
            malloc = "//base:system_malloc",
        )

        filegroup(
            name = "fg",
            srcs = ["//brokenpackage:fg"],
        )
        """);
    write(
        "package/foo.cc",
        "#include <stdio.h>",
        "int main() {",
        "  printf(\"Hello, world!\\n\");",
        "  return 0;",
        "}");
    write(
        "brokenpackage/BUILD",
        """
        filegroup(
            name = "fg",
            srcs = ["//package:foo.cc"],
        )

        nope
        """);
    BuildFailedException e =
        assertThrows(BuildFailedException.class, () -> buildTarget("package:foo.cc"));
    assertThat(e)
        .hasMessageThat()
        .contains("command succeeded, but there were errors parsing the target pattern");
  }

  @Test
  public void sourcefilePrintsWarning() throws Exception {
    write(
        "file/BUILD", "genrule(name = 'x', srcs = ['src'], cmd = 'touch $@', outs =" + " ['out'])");
    write("file/src");

    buildTarget("file/src");

    events.assertContainsWarning(
        "//file:src is a source file, nothing will be built for it. If you want to build a target"
            + " that consumes this file, try --compile_one_dependency");
  }

  @Test
  public void nonSourceFileNoWarning() throws Exception {
    write("file/BUILD", "genrule(name = 'x', cmd = 'touch $@', outs = ['out'])");

    buildTarget("file/out");

    events.assertNoWarningsOrErrors();
  }
}