// Copyright (c) 2020, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

package com.android.tools.r8.kotlin;

import com.android.tools.r8.graph.AppView;
import com.android.tools.r8.graph.DexDefinitionSupplier;
import com.android.tools.r8.graph.DexItemFactory;
import com.android.tools.r8.shaking.EnqueuerMetadataTraceable;
import com.android.tools.r8.utils.BooleanBox;
import com.android.tools.r8.utils.DescriptorUtils;
import com.google.common.collect.ImmutableList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import kotlinx.metadata.KmAnnotation;
import kotlinx.metadata.KmAnnotationArgument;

// Holds information about a KmAnnotation
public class KotlinAnnotationInfo implements EnqueuerMetadataTraceable {

  private static final List<KotlinAnnotationInfo> EMPTY_ANNOTATIONS = ImmutableList.of();

  private final KotlinTypeReference annotationType;
  private final Map<String, KotlinAnnotationArgumentInfo> arguments;

  private KotlinAnnotationInfo(
      KotlinTypeReference annotationType, Map<String, KotlinAnnotationArgumentInfo> arguments) {
    this.annotationType = annotationType;
    this.arguments = arguments;
  }

  static KotlinAnnotationInfo create(KmAnnotation annotation, DexItemFactory factory) {
    return new KotlinAnnotationInfo(
        KotlinTypeReference.fromBinaryName(
            annotation.getClassName(), factory, annotation.getClassName()),
        KotlinAnnotationArgumentInfo.create(annotation.getArguments(), factory));
  }

  static List<KotlinAnnotationInfo> create(List<KmAnnotation> annotations, DexItemFactory factory) {
    if (annotations.isEmpty()) {
      return EMPTY_ANNOTATIONS;
    }
    ImmutableList.Builder<KotlinAnnotationInfo> builder = ImmutableList.builder();
    for (KmAnnotation annotation : annotations) {
      builder.add(create(annotation, factory));
    }
    return builder.build();
  }

  boolean rewrite(
      KmVisitorProviders.KmAnnotationVisitorProvider visitorProvider, AppView<?> appView) {
    BooleanBox rewritten = new BooleanBox(false);
    rewritten.or(
        annotationType.toRenamedDescriptorOrDefault(
            renamedDescriptor -> {
              if (renamedDescriptor == null) {
                // The type has been pruned
                rewritten.set(true);
                return;
              }
              String classifier = DescriptorUtils.descriptorToKotlinClassifier(renamedDescriptor);
              Map<String, KmAnnotationArgument> rewrittenArguments = new LinkedHashMap<>();
              arguments.forEach(
                  (key, arg) ->
                      rewritten.or(
                          arg.rewrite(
                              rewrittenArg -> {
                                if (rewrittenArg != null) {
                                  rewrittenArguments.put(key, rewrittenArg);
                                }
                              },
                              appView)));
              visitorProvider.get(new KmAnnotation(classifier, rewrittenArguments));
            },
            appView,
            null));
    return rewritten.get();
  }

  @Override
  public void trace(DexDefinitionSupplier definitionSupplier) {
    annotationType.trace(definitionSupplier);
    arguments.forEach((ignored, arg) -> arg.trace(definitionSupplier));
  }
}