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apt processor for crysknife-annotations project
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/*
 * Copyright © 2021 Treblereel
 *
 * 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 io.crysknife.processor;

import java.util.Optional;

import jakarta.enterprise.inject.Produces;
import jakarta.inject.Singleton;
import javax.lang.model.element.Element;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.type.TypeMirror;

import com.google.auto.common.MoreTypes;
import io.crysknife.definition.BeanDefinition;
import io.crysknife.definition.BeanDefinitionFactory;
import io.crysknife.definition.ProducesBeanDefinition;
import io.crysknife.exception.UnableToCompleteException;
import io.crysknife.generator.api.IOCGenerator;
import io.crysknife.generator.api.WiringElementType;
import io.crysknife.generator.context.IOCContext;
import io.crysknife.logger.TreeLogger;
import io.crysknife.validation.ProducesValidator;

/**
 * @author Dmitrii Tikhomirov Created by treblereel 9/8/21
 */
public class ProducesProcessor {

    private final IOCContext iocContext;
    private final ProducesValidator validator;
    private final TreeLogger logger;
    private final BeanDefinitionFactory beanDefinitionFactory;
    private final TypeMirror objectTypeMirror;

    public ProducesProcessor(IOCContext iocContext, TreeLogger logger) {
        this.iocContext = iocContext;
        this.logger = logger;
        this.validator = new ProducesValidator(iocContext);
        this.beanDefinitionFactory = new BeanDefinitionFactory(iocContext, logger);
        this.objectTypeMirror = iocContext.getGenerationContext().getElements()
                .getTypeElement(Object.class.getCanonicalName()).asType();
    }

    public void process(Element produce) throws UnableToCompleteException {

        validator.validate(produce);
        ExecutableElement method = (ExecutableElement) produce;
        TypeMirror parent =
                iocContext.getGenerationContext().getTypes().erasure(method.getEnclosingElement().asType());

        if (!iocContext.getBeans().containsKey(parent)) {
            BeanDefinition bean = beanDefinitionFactory.of(parent);
            iocContext.getBeans().put(parent, bean);

            Optional generator = iocContext.getGenerator(Singleton.class.getCanonicalName(),
                    MoreTypes.asTypeElement(objectTypeMirror), WiringElementType.BEAN);
            generator.ifPresent(bean::setIocGenerator);
            iocContext.getBeans().put(parent, bean);
        }

        Optional generator = iocContext.getGenerator(Produces.class.getCanonicalName(),
                MoreTypes.asTypeElement(objectTypeMirror), WiringElementType.METHOD_DECORATOR);

        if (generator.isPresent()) {
            ProducesBeanDefinition beanDefinition = beanDefinitionFactory.of(method);
            generator.ifPresent(beanDefinition::setIocGenerator);
            TypeMirror beanTypeMirror =
                    iocContext.getGenerationContext().getTypes().erasure(method.getReturnType());
            // TODO this must be refactored
            if (iocContext.getBeans().containsKey(beanTypeMirror)
                    && iocContext.getBeans().get(beanTypeMirror) instanceof ProducesBeanDefinition) {
                ((ProducesBeanDefinition) iocContext.getBeans().get(beanTypeMirror))
                        .addSubtype(beanDefinition);
            } else {
                iocContext.getBeans().put(beanTypeMirror, beanDefinition);
            }
        }

    }


}