/*
 * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
 * The software in this package is published under the terms of the CPAL v1.0
 * license, a copy of which has been included with this distribution in the
 * LICENSE.txt file.
 */
package org.mule.runtime.module.extension.internal.loader.enricher;

import static java.util.Arrays.stream;
import org.mule.metadata.api.ClassTypeLoader;
import org.mule.metadata.api.model.ArrayType;
import org.mule.metadata.api.model.IntersectionType;
import org.mule.metadata.api.model.MetadataType;
import org.mule.metadata.api.model.ObjectFieldType;
import org.mule.metadata.api.model.ObjectType;
import org.mule.metadata.api.model.UnionType;
import org.mule.metadata.api.visitor.MetadataTypeVisitor;
import org.mule.runtime.api.meta.model.declaration.fluent.ExtensionDeclarer;
import org.mule.runtime.extension.api.annotation.Export;
import org.mule.runtime.extension.api.declaration.type.ExtensionsTypeLoaderFactory;
import org.mule.runtime.extension.api.loader.ExtensionLoadingContext;

/**
 * Enriches the delcaration with the types which are manually exported through {@link Export}
 *
 * @since 4.0
 */
public final class JavaExportedTypesDeclarationEnricher extends AbstractAnnotatedDeclarationEnricher {

  private final ClassTypeLoader typeLoader;

  public JavaExportedTypesDeclarationEnricher() {
    this.typeLoader = ExtensionsTypeLoaderFactory.getDefault().createTypeLoader();
  }

  @Override
  public void enrich(ExtensionLoadingContext extensionLoadingContext) {
    Export exportAnnotation = extractAnnotation(extensionLoadingContext.getExtensionDeclarer().getDeclaration(), Export.class);
    if (exportAnnotation != null) {
      ExtensionDeclarer declarer = extensionLoadingContext.getExtensionDeclarer();
      stream(exportAnnotation.classes())
          .map(typeLoader::load)
          .forEach(type -> registerType(declarer, type));

      stream(exportAnnotation.resources()).forEach(declarer::withResource);
    }
  }

  private void registerType(ExtensionDeclarer declarer, MetadataType type) {
    type.accept(new MetadataTypeVisitor() {

      @Override
      public void visitObject(ObjectType objectType) {
        if (objectType.isOpen()) {
          objectType.getOpenRestriction().get().accept(this);
        } else {
          declarer.withType(objectType);
        }
      }

      @Override
      public void visitArrayType(ArrayType arrayType) {
        arrayType.getType().accept(this);
      }

      @Override
      public void visitIntersection(IntersectionType intersectionType) {
        intersectionType.getTypes().forEach(type -> type.accept(this));
      }

      @Override
      public void visitUnion(UnionType unionType) {
        unionType.getTypes().forEach(type -> type.accept(this));
      }

      @Override
      public void visitObjectField(ObjectFieldType objectFieldType) {
        objectFieldType.getValue().accept(this);
      }
    });
  }
}