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/*
 * Copyright 2016-2023 the original author or 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 org.grails.testing

import java.lang.reflect.ParameterizedType

import groovy.transform.CompileStatic
import org.springframework.beans.factory.config.AutowireCapableBeanFactory

@CompileStatic
trait ParameterizedGrailsUnitTest extends GrailsUnitTest {

    private T artefactInstance

    Class getTypeUnderTest() {
        ParameterizedType parameterizedType = (ParameterizedType) getClass().genericInterfaces.find { genericInterface ->
            genericInterface instanceof ParameterizedType &&
                    ParameterizedGrailsUnitTest.isAssignableFrom((Class) ((ParameterizedType) genericInterface).rawType)
        }

        if (parameterizedType?.actualTypeArguments != null) {
            parameterizedType.actualTypeArguments[0]
        }
        else {
            null
        }
    }

    T getArtefactInstance() {
        if (artefactInstance == null && applicationContext != null) {
            def cutType = getTypeUnderTest()
            if (cutType != null) {
                mockArtefact(cutType)
                String beanName = getBeanName(cutType)
                if (beanName != null && applicationContext.containsBean(beanName)) {
                    artefactInstance = applicationContext.getBean(beanName, T)
                }
                else {
                    artefactInstance = cutType.newInstance()
                    applicationContext.autowireCapableBeanFactory.autowireBeanProperties(
                            artefactInstance, AutowireCapableBeanFactory.AUTOWIRE_BY_NAME, false)
                }
            }
        }
        artefactInstance
    }

    abstract void mockArtefact(Class artefactClass)

    abstract String getBeanName(Class artefactClass)

}