/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.dubbo.metadata.annotation.processing.builder;

import org.apache.dubbo.metadata.annotation.processing.util.FieldUtils;
import org.apache.dubbo.metadata.definition.model.TypeDefinition;

import javax.annotation.processing.ProcessingEnvironment;
import javax.lang.model.element.Element;
import javax.lang.model.element.Name;
import javax.lang.model.type.DeclaredType;

import java.util.Map;

import static org.apache.dubbo.metadata.annotation.processing.util.FieldUtils.getDeclaredFields;
import static org.apache.dubbo.metadata.annotation.processing.util.TypeUtils.isEnumType;

/**
 * {@link TypeBuilder} for Java {@link Enum}
 *
 * @since 2.7.6
 */
public class EnumTypeDefinitionBuilder implements DeclaredTypeDefinitionBuilder {

    @Override
    public boolean accept(ProcessingEnvironment processingEnv, DeclaredType type) {
        return isEnumType(type);
    }

    @Override
    public TypeDefinition build(ProcessingEnvironment processingEnv, DeclaredType type, Map<String, TypeDefinition> typeCache) {
        TypeDefinition typeDefinition = new TypeDefinition(type.toString());
        getDeclaredFields(type, FieldUtils::isEnumMemberField)
                .stream()
                .map(Element::getSimpleName)
                .map(Name::toString)
                .forEach(typeDefinition.getEnums()::add);
        return typeDefinition;
    }

    @Override
    public int getPriority() {
        return MIN_PRIORITY - 2;
    }
}
