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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.builder;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

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

/**
 * @author Marius Bogoevici
 */

class InterceptionModelImpl implements BuildableInterceptionModel {

    private final Map>> globalInterceptors = new HashMap>>();

    private final Map>>> methodBoundInterceptors = new HashMap>>>();

    private final Set methodsIgnoringGlobals = new HashSet();

    private final Set> allInterceptors = new LinkedHashSet>();

    private final T interceptedEntity;

    public InterceptionModelImpl(T interceptedEntity) {
        this.interceptedEntity = interceptedEntity;
    }

    public List> getInterceptors(InterceptionType interceptionType, Method method) {
        if (interceptionType.isLifecycleCallback() && method != null) {
            throw new IllegalArgumentException("On a lifecycle callback, the associated method must be null");
        }

        if (!interceptionType.isLifecycleCallback() && method == null) {
            throw new IllegalArgumentException("Around-invoke and around-timeout interceptors are defined for a given method");
        }

        if (interceptionType.isLifecycleCallback()) {
            if (globalInterceptors.containsKey(interceptionType)) {
                return globalInterceptors.get(interceptionType);
            }
        } else {
            ArrayList> returnedInterceptors = new ArrayList>();
            if (!methodsIgnoringGlobals.contains(methodHolder(method)) && globalInterceptors.containsKey(interceptionType)) {
                returnedInterceptors.addAll(globalInterceptors.get(interceptionType));
            }
            if (methodBoundInterceptors.containsKey(interceptionType) && methodBoundInterceptors.get(interceptionType).containsKey(methodHolder(method))) {
                returnedInterceptors.addAll(methodBoundInterceptors.get(interceptionType).get(methodHolder(method)));
            }
            return returnedInterceptors;
        }
        return Collections.EMPTY_LIST;
    }

    public Set> getAllInterceptors() {
        return Collections.unmodifiableSet(allInterceptors);
    }

    public T getInterceptedEntity() {
        return this.interceptedEntity;
    }

    public void setIgnoresGlobals(Method method, boolean ignoresGlobals) {
        if (ignoresGlobals) {
            methodsIgnoringGlobals.add(methodHolder(method));
        } else {
            methodsIgnoringGlobals.remove(methodHolder(method));
        }
    }

    public void appendInterceptors(InterceptionType interceptionType, Method method, InterceptorMetadata... interceptors) {
        if (null == method) {
            List> interceptorsList = globalInterceptors.get(interceptionType);
            if (interceptorsList == null) {
                interceptorsList = new ArrayList>();
                globalInterceptors.put(interceptionType, interceptorsList);
            }
            appendInterceptorClassesToList(interceptionType, interceptorsList, interceptors);
        } else {
            if (null == methodBoundInterceptors.get(interceptionType)) {
                methodBoundInterceptors.put(interceptionType, new HashMap>>());
            }
            List> interceptorsList = methodBoundInterceptors.get(interceptionType).get(methodHolder(method));
            if (interceptorsList == null) {
                interceptorsList = new ArrayList>();
                methodBoundInterceptors.get(interceptionType).put(methodHolder(method), interceptorsList);
            }
            if (globalInterceptors.containsKey(interceptionType)) {
                validateDuplicateInterceptors(interceptionType, globalInterceptors.get(interceptionType), interceptors);
            }
            appendInterceptorClassesToList(interceptionType, interceptorsList, interceptors);
        }
        allInterceptors.addAll(Arrays.asList(interceptors));
    }

    private void appendInterceptorClassesToList(InterceptionType interceptionType, List> interceptorsList, InterceptorMetadata... interceptors) {
        validateDuplicateInterceptors(interceptionType, interceptorsList, interceptors);
        interceptorsList.addAll(Arrays.asList(interceptors));
    }

    private void validateDuplicateInterceptors(InterceptionType interceptionType, List> interceptorsList, InterceptorMetadata... interceptors) {
        for (InterceptorMetadata interceptor : interceptors) {
            if (interceptorsList.contains(interceptor)) {
                if (interceptionType != null) {
                    throw new InterceptorException("Duplicate interceptor class definition when binding " + interceptor.getInterceptorClass().getClassName() + " on " + interceptionType.name());
                }
            }
        }
    }

    private static MethodReference methodHolder(Method method) {
        return MethodReference.of(method, true);
    }

}