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/*
 * Copyright 2017-2020 original authors
 *
 * 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
 *
 * https://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.micronaut.inject.qualifiers;

import io.micronaut.context.Qualifier;
import io.micronaut.core.annotation.AnnotationMetadata;
import io.micronaut.core.annotation.AnnotationUtil;
import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.naming.NameResolver;
import io.micronaut.inject.BeanDefinition;
import io.micronaut.inject.BeanType;

import java.lang.annotation.Annotation;
import java.util.Objects;
import java.util.Optional;

/**
 * Qualifies using a name.
 *
 * @param  The type
 * @author Graeme Rocher
 * @since 1.0
 */
@Internal
class NameQualifier extends FilteringQualifier implements io.micronaut.core.naming.Named {

    protected final Class annotationType;
    private final String name;

    NameQualifier(AnnotationMetadata annotationMetadata, String name) {
        this.annotationType = annotationMetadata != null ? annotationMetadata.getAnnotationType(name).orElse(null) : null;
        this.name = Objects.requireNonNull(annotationType == null ? name : annotationType.getSimpleName(), "Argument [name] cannot be null");
    }

    NameQualifier(Class annotationType) {
        this.name = Objects.requireNonNull(annotationType.getSimpleName(), "Argument [name] cannot be null");
        this.annotationType = annotationType;
    }

    @Override
    public boolean doesQualify(Class beanType, BeanType candidate) {
        if (!QualifierUtils.matchType(beanType, candidate)) {
            return false;
        }
        if (QualifierUtils.matchAny(beanType, candidate)) {
            return true;
        }
        AnnotationMetadata annotationMetadata = candidate.getAnnotationMetadata();
        // here we resolved the declared Qualifier of the bean
        String thisName = annotationMetadata
            .findDeclaredAnnotation(AnnotationUtil.NAMED)
            .flatMap(AnnotationValue::stringValue)
            .orElse(null);

        if (thisName == null && candidate instanceof BeanDefinition beanDefinition) {
            Qualifier qualifier = beanDefinition.getDeclaredQualifier();
            if (qualifier != null && qualifier.contains(this)) {
                return true;
            }
        }
        if (thisName == null) {
            if (candidate instanceof NameResolver) {
                Optional resolvedName = ((NameResolver) candidate).resolveName();
                thisName = resolvedName.orElse(candidate.getBeanType().getSimpleName());
            } else {
                thisName = candidate.getBeanType().getSimpleName();
            }
        }
        return thisName.equalsIgnoreCase(name) || thisName.equalsIgnoreCase(name + beanType.getSimpleName());
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || !NameQualifier.class.isAssignableFrom(o.getClass())) {
            return false;
        }

        NameQualifier that = (NameQualifier) o;

        return name.equals(that.name);
    }

    @Override
    public String toString() {
        return "@Named('" + name + "')";
    }

    @Override
    public int hashCode() {
        return name.hashCode();
    }

    @Override
    public String getName() {
        return name;
    }

}