// 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.starlarkbuildapi;

import com.google.devtools.build.lib.collect.nestedset.Depset;
import com.google.devtools.build.lib.starlarkbuildapi.core.ProviderApi;
import com.google.devtools.build.lib.starlarkbuildapi.core.StructApi;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.syntax.StarlarkThread;
import net.starlark.java.annot.Param;
import net.starlark.java.annot.StarlarkBuiltin;
import net.starlark.java.annot.StarlarkConstructor;
import net.starlark.java.annot.StarlarkDocumentationCategory;
import net.starlark.java.annot.StarlarkMethod;

/** A provider that gives general information about a target's direct and transitive files. */
@StarlarkBuiltin(
    name = "DefaultInfo",
    category = StarlarkDocumentationCategory.PROVIDER,
    doc =
        "A provider that gives general information about a target's direct and transitive files. "
            + "Every rule type has this provider, even if it is not returned explicitly by the "
            + "rule's implementation function. "
            + "Each <code>DefaultInfo</code> instance has the following fields: "
            + "<ul>"
            + "<li><code>files</code>"
            + "<li><code>files_to_run</code>"
            + "<li><code>data_runfiles</code>"
            + "<li><code>default_runfiles</code>"
            + "</ul>"
            + "See the <a href='../rules.$DOC_EXT'>rules</a> page for extensive guides on how to "
            + "use this provider.")
public interface DefaultInfoApi extends StructApi {

  static final String DEPRECATED_RUNFILES_PARAMETER_WARNING =
      "<p><b>It is recommended that you avoid using this parameter (see "
          + "<a href='../rules.$DOC_EXT#runfiles-features-to-avoid'>"
          + "\"runfiles features to avoid\"</a>)</b></p> ";

  @StarlarkMethod(
      name = "files",
      doc =
          "A <a href='depset.html'><code>depset</code></a> of "
              + "<a href='File.html'><code>File</code></a> objects representing the default "
              + "outputs to build when this target is specified on the blaze command line. By "
              + "default it is all predeclared outputs.",
      structField = true,
      allowReturnNones = true)
  Depset getFiles();

  @StarlarkMethod(
      name = "files_to_run",
      doc =
          "A <a href='FilesToRunProvider.html'><code>FilesToRunProvider</code></a> object "
              + "containing information about the executable and runfiles of the target.",
      structField = true,
      allowReturnNones = true)
  FilesToRunProviderApi<?> getFilesToRun();

  @StarlarkMethod(
      name = "data_runfiles",
      doc =
          "runfiles descriptor describing the files that this target needs when run in the "
              + "condition that it is a <code>data</code> dependency attribute. Under most "
              + "circumstances, use the <code>default_runfiles</code> parameter instead. "
              + "See <a href='../rules.$DOC_EXT#runfiles-features-to-avoid'>"
              + "\"runfiles features to avoid\"</a> for details. ",
      structField = true,
      allowReturnNones = true)
  RunfilesApi getDataRunfiles();

  @StarlarkMethod(
      name = "default_runfiles",
      doc =
          "runfiles descriptor describing the files that this target needs when run "
              + "(via the <code>run</code> command or as a tool dependency).",
      structField = true,
      allowReturnNones = true)
  RunfilesApi getDefaultRunfiles();

  /** Provider for {@link DefaultInfoApi}. */
  @StarlarkBuiltin(name = "Provider", documented = false, doc = "")
  interface DefaultInfoApiProvider<RunfilesT extends RunfilesApi, FileT extends FileApi>
      extends ProviderApi {

    @StarlarkMethod(
        name = "DefaultInfo",
        doc = "<p>The <code>DefaultInfo</code> constructor.",
        parameters = {
          @Param(
              name = "files",
              type = Depset.class,
              named = true,
              positional = false,
              defaultValue = "None",
              noneable = true,
              doc =
                  "A <a href='depset.html'><code>depset</code></a> of <a"
                      + " href='File.html'><code>File</code></a> objects representing the default"
                      + " outputs to build when this target is specified on the blaze command"
                      + " line. By default it is all predeclared outputs."),
          @Param(
              name = "runfiles",
              type = RunfilesApi.class,
              named = true,
              positional = false,
              defaultValue = "None",
              noneable = true,
              doc =
                  "runfiles descriptor describing the files that this target needs when run "
                      + "(via the <code>run</code> command or as a tool dependency)."),
          @Param(
              name = "data_runfiles",
              type = RunfilesApi.class,
              named = true,
              positional = false,
              defaultValue = "None",
              noneable = true,
              doc =
                  DEPRECATED_RUNFILES_PARAMETER_WARNING
                      + "runfiles descriptor describing the runfiles this target needs to run "
                      + "when it is a dependency via the <code>data</code> attribute."),
          @Param(
              name = "default_runfiles",
              type = RunfilesApi.class,
              named = true,
              positional = false,
              defaultValue = "None",
              noneable = true,
              doc =
                  DEPRECATED_RUNFILES_PARAMETER_WARNING
                      + "runfiles descriptor describing the runfiles this target needs to run "
                      + "when it is a dependency via any attribute other than the "
                      + "<code>data</code> attribute."),
          @Param(
              name = "executable",
              type = FileApi.class,
              named = true,
              positional = false,
              defaultValue = "None",
              noneable = true,
              doc =
                  "If this rule is marked <a"
                      + " href='globals.html#rule.executable'><code>executable</code></a> or <a"
                      + " href='globals.html#rule.test'><code>test</code></a>, this is a <a"
                      + " href='File.html'><code>File</code></a> object representing the file that"
                      + " should be executed to run the target. By default it is the predeclared"
                      + " output <code>ctx.outputs.executable</code>.")
        },
        selfCall = true,
        useStarlarkThread = true)
    @StarlarkConstructor(objectType = DefaultInfoApi.class, receiverNameForDoc = "DefaultInfo")
    DefaultInfoApi constructor(
        // TODO(cparsons): Use stricter types when Runfiles.NONE is passed as null.
        Object files,
        Object runfiles,
        Object dataRunfiles,
        Object defaultRunfiles,
        Object executable,
        StarlarkThread thread)
        throws EvalException;
  }
}
