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/*
 * JBoss, Home of Professional Open Source
 * Copyright 2009, Red Hat, Inc. and/or its affiliates, 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.interceptor.util;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.concurrent.Callable;

import org.jboss.weld.interceptor.proxy.InterceptorException;
import org.jboss.weld.interceptor.proxy.LifecycleMixin;
import org.jboss.weld.interceptor.spi.model.InterceptionType;

/**
 * @author Marius Bogoevici
 */
public class InterceptionUtils {
    public static final String POST_CONSTRUCT = "lifecycle_mixin_$$_postConstruct";
    public static final String PRE_DESTROY = "lifecycle_mixin_$$_preDestroy";


    private static final Class INTERCEPTORS_ANNOTATION_CLASS;
    private static final Class EXCLUDE_CLASS_INTERCEPTORS_ANNOTATION_CLASS;

    static {
        Class interceptorAnnotation = null;
        Class excludeClass = null;
        try {
            interceptorAnnotation = (Class) Class.forName("javax.interceptor.Interceptors");
            excludeClass = (Class) Class.forName("javax.interceptor.ExcludeClassInterceptors");
        } catch (ClassNotFoundException e) {
            //do nothing
        }
        INTERCEPTORS_ANNOTATION_CLASS = interceptorAnnotation;
        EXCLUDE_CLASS_INTERCEPTORS_ANNOTATION_CLASS = excludeClass;
    }

    private static void executePostConstruct(Object proxy, Callable callback) {
        if (proxy instanceof LifecycleMixin) {
            LifecycleMixin lifecycleMixin = (LifecycleMixin) proxy;
            lifecycleMixin.lifecycle_mixin_$$_postConstruct();
        }
        if (callback != null) {
            try {
                callback.call();
            } catch (Exception e) {
                throw new InterceptorException(e);
            }
        }
    }

    public static void executePostConstruct(Object proxy) {
        executePostConstruct(proxy, null);
    }

    private static void executePredestroy(Object proxy, Callable callback) {
        if (proxy instanceof LifecycleMixin) {
            LifecycleMixin lifecycleMixin = (LifecycleMixin) proxy;
            lifecycleMixin.lifecycle_mixin_$$_preDestroy();
        }
        if (callback != null) {
            try {
                callback.call();
            } catch (Exception e) {
                throw new InterceptorException(e);
            }
        }
    }

    public static void executePredestroy(Object proxy) {
        executePredestroy(proxy, null);
    }

    /**
     * @param method
     * @return true if the method has none of the interception type annotations, and is public and not static
     *         false otherwise
     */
    public static boolean isInterceptionCandidate(Method method) {
        // just a provisory implementation - any method which is not an interceptor method
        // is an interception candidate
        if (method.getDeclaringClass().equals(Object.class))
            return false;
        int modifiers = method.getModifiers();
        if (Modifier.isStatic(modifiers))
            return false;
        for (InterceptionType interceptionType : InterceptionTypeRegistry.getSupportedInterceptionTypes()) {
            if (method.getAnnotation(InterceptionTypeRegistry.getAnnotationClass(interceptionType)) != null) {
                return false;
            }
        }
        return true;
    }

    public static Class getInterceptorsAnnotationClass() {
        return INTERCEPTORS_ANNOTATION_CLASS;
    }

    public static Class getExcludeClassInterceptorsAnnotationClass() {
        return EXCLUDE_CLASS_INTERCEPTORS_ANNOTATION_CLASS;
    }
}