// 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.rules.objc;

import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.actions.Artifact;
import com.google.devtools.build.lib.actions.MutableActionGraph.ActionConflictException;
import com.google.devtools.build.lib.analysis.ConfiguredTarget;
import com.google.devtools.build.lib.analysis.RuleConfiguredTargetFactory;
import com.google.devtools.build.lib.analysis.RuleContext;
import com.google.devtools.build.lib.collect.nestedset.NestedSet;
import com.google.devtools.build.lib.collect.nestedset.NestedSetBuilder;
import com.google.devtools.build.lib.packages.Type;
import com.google.devtools.build.lib.rules.cpp.CcInfo;
import com.google.devtools.build.lib.rules.cpp.CppSemantics;
import java.util.Map;
import java.util.TreeMap;

/**
 * Implementation for {@code objc_import}.
 */
public class ObjcImport implements RuleConfiguredTargetFactory {
  private final CppSemantics cppSemantics;

  protected ObjcImport(CppSemantics cppSemantics) {
    this.cppSemantics = cppSemantics;
  }

  @Override
  public ConfiguredTarget create(RuleContext ruleContext)
      throws InterruptedException, RuleErrorException, ActionConflictException {

    CompilationAttributes compilationAttributes =
        CompilationAttributes.Builder.fromRuleContext(ruleContext).build();
    IntermediateArtifacts intermediateArtifacts =
        ObjcRuleClasses.intermediateArtifacts(ruleContext);
    CompilationArtifacts compilationArtifacts = new CompilationArtifacts.Builder().build();

    ObjcCommon common =
        new ObjcCommon.Builder(ObjcCommon.Purpose.COMPILE_AND_LINK, ruleContext)
            .setCompilationArtifacts(compilationArtifacts)
            .setCompilationAttributes(compilationAttributes)
            .addDeps(ruleContext.getPrerequisites("deps"))
            .setIntermediateArtifacts(intermediateArtifacts)
            .setAlwayslink(ruleContext.attributes().get("alwayslink", Type.BOOLEAN))
            .setHasModuleMap()
            .addExtraImportLibraries(ruleContext.getPrerequisiteArtifacts("archives").list())
            .build();

    NestedSetBuilder<Artifact> filesToBuild = NestedSetBuilder.stableOrder();

    Map<String, NestedSet<Artifact>> outputGroupCollector = new TreeMap<>();
    ImmutableList.Builder<Artifact> objectFilesCollector = ImmutableList.builder();

    CompilationSupport compilationSupport =
        new CompilationSupport.Builder(ruleContext, cppSemantics)
            .setOutputGroupCollector(outputGroupCollector)
            .setObjectFilesCollector(objectFilesCollector)
            .build();

    compilationSupport.registerCompileAndArchiveActions(common).validateAttributes();

    return ObjcRuleClasses.ruleConfiguredTarget(ruleContext, filesToBuild.build())
        .addNativeDeclaredProvider(common.getObjcProvider())
        .addNativeDeclaredProvider(
            CcInfo.builder()
                .setCcCompilationContext(compilationSupport.getCcCompilationContext())
                .build())
        .addStarlarkTransitiveInfo(ObjcProvider.STARLARK_NAME, common.getObjcProvider())
        .build();
  }
}