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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.context;

import io.micronaut.context.scope.CustomScope;
import io.micronaut.context.scope.CustomScopeRegistry;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.reflect.ClassUtils;
import io.micronaut.inject.qualifiers.Qualifiers;

import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.ConcurrentHashMap;

/**
 * Default implementation of the {@link CustomScopeRegistry} interface.
 *
 * @author Graeme Rocher
 * @since 1.0
 */
@Internal
class DefaultCustomScopeRegistry implements CustomScopeRegistry {

    private final BeanLocator beanLocator;
    private final Map> scopes = new ConcurrentHashMap<>(2);
    private final ClassLoader classLoader;

    /**
     * @param beanLocator The bean locator
     * @param classLoader The class loader
     */
    DefaultCustomScopeRegistry(BeanLocator beanLocator, ClassLoader classLoader) {
        this.beanLocator = beanLocator;
        this.classLoader = classLoader;
    }

    @SuppressWarnings("unchecked")
    @Override
    public Optional findScope(Class scopeAnnotation) {
        return scopes.computeIfAbsent(scopeAnnotation.getName(), s -> {
            final Qualifier qualifier = Qualifiers.byTypeArguments(scopeAnnotation);
            return beanLocator.findBean(CustomScope.class, qualifier);
        });
    }

    @SuppressWarnings("unchecked")
    @Override
    public Optional findScope(String scopeAnnotation) {
        return scopes.computeIfAbsent(scopeAnnotation, type -> {
            final Optional scopeClass = ClassUtils.forName(type, classLoader);
            if (scopeClass.isPresent()) {
                final Qualifier qualifier = Qualifiers.byTypeArguments(scopeClass.get());
                return beanLocator.findBean(CustomScope.class, qualifier);
            }
            return Optional.empty();
        });
    }

}