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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2022, Red Hat, Inc., and individual contributors
 * by the @authors tag. See the copyright.txt in the distribution for a
 * full listing of individual contributors.
 *
 * 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 org.jboss.weld.spock.impl;

import jakarta.enterprise.context.spi.CreationalContext;
import jakarta.enterprise.event.Observes;
import jakarta.enterprise.inject.spi.Extension;
import jakarta.enterprise.inject.spi.InjectionTarget;
import jakarta.enterprise.inject.spi.ProcessAnnotatedType;
import jakarta.enterprise.inject.spi.ProcessInjectionTarget;
import jakarta.enterprise.util.AnnotationLiteral;
import jakarta.inject.Singleton;

import org.jboss.weld.injection.ForwardingInjectionTarget;

/**
 * Extension that makes a test instance appear like a regular bean even though instantiated by JUnit.
 *
 * @author Björn Kautler
 */
class TestInstanceInjectionExtension implements Extension {
    private static final AnnotationLiteral SINGLETON_LITERAL = new AnnotationLiteral() {
    };

    private final Class testClass;
    private final T testInstance;

    TestInstanceInjectionExtension(T testInstance) {
        this.testClass = testInstance.getClass();
        this.testInstance = testInstance;
    }

    void rewriteTestClassScope(@Observes ProcessAnnotatedType pat) {
        if (pat.getAnnotatedType().getJavaClass().equals(testClass)) {
            pat.configureAnnotatedType().add(SINGLETON_LITERAL);
        }
    }

    private class TestInstanceInjectionTarget extends ForwardingInjectionTarget {
        private final InjectionTarget injectionTarget;

        TestInstanceInjectionTarget(InjectionTarget injectionTarget) {
            this.injectionTarget = injectionTarget;
        }

        @Override
        protected InjectionTarget delegate() {
            return injectionTarget;
        }

        @Override
        public T produce(CreationalContext creationalContext) {
            return testInstance;
        }
    }

    void rewriteTestInstanceInjectionTarget(@Observes ProcessInjectionTarget pit) {
        if (pit.getAnnotatedType().getJavaClass().equals(testClass)) {
            pit.setInjectionTarget(new TestInstanceInjectionTarget(pit.getInjectionTarget()));
        }
    }
}