// Copyright 2014 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.docgen.annot.DocCategory;
import com.google.devtools.build.lib.collect.nestedset.Depset;
import net.starlark.java.annot.Param;
import net.starlark.java.annot.ParamType;
import net.starlark.java.annot.StarlarkBuiltin;
import net.starlark.java.annot.StarlarkMethod;
import net.starlark.java.eval.EvalException;
import net.starlark.java.eval.Sequence;
import net.starlark.java.eval.StarlarkThread;
import net.starlark.java.eval.StarlarkValue;

/** An interface for a set of runfiles. */
@StarlarkBuiltin(
    name = "runfiles",
    category = DocCategory.BUILTIN,
    doc =
        "A container of information regarding a set of files required at runtime execution. This"
            + " object should be passed via <a href=\"DefaultInfo.html\">DefaultInfo</a> in order"
            + " to tell the build system about the runfiles needed by the outputs produced by the"
            + " rule. <p>See <a"
            + " href=\"https://bazel.build/extending/rules#runfiles\">runfiles"
            + " guide</a> for details.")
public interface RunfilesApi extends StarlarkValue {

  @StarlarkMethod(name = "files", doc = "Returns the set of runfiles as files.", structField = true)
  Depset /*<? extends FileApi>*/ getArtifactsForStarlark();

  @StarlarkMethod(name = "symlinks", doc = "Returns the set of symlinks.", structField = true)
  Depset /*<? extends SymlinkEntryApi>*/ getSymlinksForStarlark();

  @StarlarkMethod(
      name = "root_symlinks",
      doc = "Returns the set of root symlinks.",
      structField = true)
  Depset /*<? extends SymlinkEntryApi>*/ getRootSymlinksForStarlark();

  @StarlarkMethod(
      name = "empty_filenames",
      doc = "Returns names of empty files to create.",
      structField = true)
  Depset /*<String>*/ getEmptyFilenamesForStarlark();

  @StarlarkMethod(
      name = "merge",
      doc =
          "Returns a new runfiles object that includes all the contents of this one and the "
              + "argument."
              + "<p><i>Note:</i> When you have many runfiles objects to merge, use <a "
              + "href='#merge_all'><code>merge_all()</code></a> rather than calling <code>merge"
              + "</code> in a loop. This avoids constructing deep depset structures which can "
              + "cause build failures.",
      parameters = {
        @Param(
            name = "other",
            positional = true,
            named = false,
            doc = "The runfiles object to merge into this."),
      },
      useStarlarkThread = true)
  RunfilesApi merge(RunfilesApi other, StarlarkThread thread) throws EvalException;

  @StarlarkMethod(
      name = "merge_all",
      doc =
          "Returns a new runfiles object that includes all the contents of this one and of the "
              + "runfiles objects in the argument.",
      parameters = {
        @Param(
            name = "other",
            allowedTypes = {
              @ParamType(type = Sequence.class, generic1 = RunfilesApi.class),
            },
            positional = true,
            named = false,
            doc = "The sequence of runfiles objects to merge into this."),
      },
      useStarlarkThread = true)
  RunfilesApi mergeAll(Sequence<?> sequence, StarlarkThread thread) throws EvalException;
}