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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2008, 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.util;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;

import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.ObserverMethod;

import org.jboss.weld.event.ObserverMethodImpl;
import org.jboss.weld.exceptions.IllegalArgumentException;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.resources.SharedObjectCache;
import org.jboss.weld.util.reflection.Reflections;

import static org.jboss.weld.logging.messages.UtilMessage.EVENT_TYPE_NOT_ALLOWED;
import static org.jboss.weld.logging.messages.UtilMessage.TYPE_PARAMETER_NOT_ALLOWED_IN_EVENT_TYPE;

/**
 * @author pmuir
 */
public class Observers {

    public static void checkEventObjectType(BeanManagerImpl manager, Type eventType) {
        checkEventObjectType(manager.getServices().get(SharedObjectCache.class), eventType);
    }

    public static void checkEventObjectType(final SharedObjectCache cache, Type eventType) {
        Type[] types;
        final Type resolvedType = cache.getResolvedType(eventType);
        if (resolvedType instanceof Class) {
            types = new Type[0];
        } else if (resolvedType instanceof ParameterizedType) {
            types = ((ParameterizedType) resolvedType).getActualTypeArguments();
        } else {
            throw new IllegalArgumentException(EVENT_TYPE_NOT_ALLOWED, resolvedType);
        }
        for (Type type : types) {
            if (type instanceof TypeVariable) {
                throw new IllegalArgumentException(TYPE_PARAMETER_NOT_ALLOWED_IN_EVENT_TYPE, resolvedType);
            }
        }
    }

    public static void checkEventObjectType(final SharedObjectCache cache, Object event) {
        checkEventObjectType(cache, event.getClass());

    }

    public static boolean isObserverMethodEnabled(ObserverMethod method, BeanManagerImpl manager) {
        if (method instanceof ObserverMethodImpl) {
            Bean declaringBean = Reflections.> cast(method).getDeclaringBean();
            return manager.isBeanEnabled(declaringBean) && !Beans.isSpecialized(declaringBean, manager) && !Beans.isSuppressedBySpecialization(declaringBean, manager);
        }
        return true;
    }
}