/**
 * Copyright 2005-2014 The Kuali Foundation
 *
 * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
 *
 * 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.kuali.rice.test;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.kuali.rice.core.framework.resourceloader.SpringResourceLoader;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.NoSuchBeanDefinitionException;
import org.springframework.core.ResolvableType;

import java.util.ArrayList;
import java.util.Collection;

/** 
 * Wraps a collection of bean factories delegating to the inner bean factories.
 * 
 * The first bean factory that returns a non-null/true result is the value that is returned/
 */
public final class CompositeBeanFactory implements BeanFactory {

        private static final Log LOG = LogFactory.getLog(CompositeBeanFactory.class);
        
        private final Collection<BeanFactory> factories;
        
        public static BeanFactory createBeanFactory(Collection<? extends SpringResourceLoader> rls) {
                if (rls == null || rls.isEmpty()) {
                        throw new IllegalArgumentException("rls is null or empty");
                }
                
                final Collection<BeanFactory> bfs = new ArrayList<BeanFactory>();
                for (SpringResourceLoader rl : rls) {
                        bfs.add(rl.getContext());
                }
                return new CompositeBeanFactory(bfs);
        }
        
        public CompositeBeanFactory(Collection<? extends BeanFactory> factories) {
                if (factories == null || factories.isEmpty()) {
                        throw new IllegalArgumentException("factories is null or empty");
                }
                
                this.factories = new ArrayList<BeanFactory>(factories);
        }

        @Override
        public Object getBean(String name) throws BeansException {
                for (BeanFactory f : factories) {
                        try {
                                Object o = f.getBean(name);
                                if (o != null) {
                                        return o;
                                }       
                        } catch (BeansException e) {
                                LOG.debug("bean exception", e);
                        }
                }
                return null;
        }

        @Override
        public <T> T getBean(String name, Class<T> requiredType) throws BeansException {
                for (BeanFactory f : factories) {
                        try {
                                T t = f.getBean(name, requiredType);
                                if (t != null) {
                                        return t;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return null;
        }

        @Override
        public <T> T getBean(Class<T> requiredType) throws BeansException {
                for (BeanFactory f : factories) {
                        try {
                                T t = f.getBean(requiredType);
                                if (t != null) {
                                        return t;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return null;
        }

        @Override
        public Object getBean(String name, Object... args) throws BeansException {
                for (BeanFactory f : factories) {
                        try {
                                Object o = f.getBean(name, args);
                                if (o != null) {
                                        return o;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return null;
        }

    @Override
    public <T> T getBean(Class<T> tClass, Object... objects) throws BeansException {
        // Does not currently support creating a bean instance using explicit arguments
        return getBean(tClass);
    }

    @Override
        public boolean containsBean(String name) {
                for (BeanFactory f : factories) {
                        try {
                                boolean b = f.containsBean(name);
                                if (b) {
                                        return b;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return false;
        }

        @Override
        public boolean isSingleton(String name) throws NoSuchBeanDefinitionException {
                for (BeanFactory f : factories) {
                        try {
                                boolean b = f.isSingleton(name);
                                if (b) {
                                        return b;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return false;
        }

        @Override
        public boolean isPrototype(String name) throws NoSuchBeanDefinitionException {
                for (BeanFactory f : factories) {
                        try {
                                boolean b = f.isPrototype(name);
                                if (b) {
                                        return b;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return false;
        }

        @Override
        public boolean isTypeMatch(String name, Class targetType) throws NoSuchBeanDefinitionException {
                for (BeanFactory f : factories) {
                        try {
                                boolean b = f.isTypeMatch(name, targetType);
                                if (b) {
                                        return b;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return false;
        }

        @Override
        public boolean isTypeMatch(String name, ResolvableType typeToMatch) throws NoSuchBeanDefinitionException {
                for (BeanFactory f : factories) {
                        try {
                                boolean b = f.isTypeMatch(name, typeToMatch);
                                if (b) {
                                        return b;
                                }
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return false;
        }

        @Override
        public Class<?> getType(String name) throws NoSuchBeanDefinitionException {
                for (BeanFactory f : factories) {
                        try {
                                Class<?> c = f.getType(name);
                                if (c != null) {
                                        return c;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return null;
        }

        @Override
        public String[] getAliases(String name) {
                for (BeanFactory f : factories) {
                        try {
                                String[] s = f.getAliases(name);
                                if (s != null) {
                                        return s;
                                }       
                        } catch (BeansException e) {
                                LOG.info("bean exception", e);
                        }
                }
                return null;
        }
}