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/*
 * Fabric3
 * Copyright (c) 2009-2013 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
 * you are not obligated to do so. If you do not wish to do so,
 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
 *
 * ----------------------------------------------------
 *
 * Portions originally based on Apache Tuscany 2007
 * licensed under the Apache 2.0 license.
 *
 */
package org.fabric3.implementation.system.runtime;

import java.lang.reflect.Method;
import java.net.URI;
import java.util.List;

import org.oasisopen.sca.annotation.EagerInit;
import org.oasisopen.sca.annotation.Reference;

import org.fabric3.implementation.system.provision.SystemTargetDefinition;
import org.fabric3.spi.builder.WiringException;
import org.fabric3.spi.builder.component.TargetWireAttacher;
import org.fabric3.spi.builder.component.WireAttachException;
import org.fabric3.spi.classloader.ClassLoaderRegistry;
import org.fabric3.spi.cm.ComponentManager;
import org.fabric3.spi.model.physical.PhysicalOperationDefinition;
import org.fabric3.spi.model.physical.PhysicalSourceDefinition;
import org.fabric3.spi.objectfactory.ObjectFactory;
import org.fabric3.spi.util.UriHelper;
import org.fabric3.spi.wire.InvocationChain;
import org.fabric3.spi.wire.Wire;

/**
 *
 */
@EagerInit
public class SystemTargetWireAttacher implements TargetWireAttacher {

    private final ComponentManager manager;
    private final ClassLoaderRegistry classLoaderRegistry;

    public SystemTargetWireAttacher(@Reference ComponentManager manager,
                                    @Reference ClassLoaderRegistry classLoaderRegistry) {
        this.manager = manager;
        this.classLoaderRegistry = classLoaderRegistry;
    }

    public void attach(PhysicalSourceDefinition source, SystemTargetDefinition target, Wire wire) throws WiringException {
        URI targetId = UriHelper.getDefragmentedName(target.getUri());
        SystemComponent targetComponent = (SystemComponent) manager.getComponent(targetId);

        Class implementationClass = targetComponent.getImplementationClass();
        ClassLoader loader = implementationClass.getClassLoader();

        for (InvocationChain chain : wire.getInvocationChains()) {
            PhysicalOperationDefinition operation = chain.getPhysicalOperation();

            List params = operation.getSourceParameterTypes();
            Class[] paramTypes = new Class[params.size()];
            for (int i = 0; i < params.size(); i++) {
                String param = params.get(i);
                try {
                    paramTypes[i] = classLoaderRegistry.loadClass(loader, param);
                } catch (ClassNotFoundException e) {
                    URI sourceUri = source.getUri();
                    URI targetUri = target.getUri();
                    throw new WireAttachException("Implementation class not found", sourceUri, targetUri, e);
                }
            }
            Method method;
            try {
                method = implementationClass.getMethod(operation.getName(), paramTypes);
            } catch (NoSuchMethodException e) {
                URI sourceUri = source.getUri();
                URI targetUri = target.getUri();
                throw new WireAttachException("No matching method found", sourceUri, targetUri, e);
            }

            SystemInvokerInterceptor interceptor = new SystemInvokerInterceptor(method, targetComponent);
            chain.addInterceptor(interceptor);
        }
    }

    public void detach(PhysicalSourceDefinition source, SystemTargetDefinition target) throws WiringException {
        throw new AssertionError();
    }

    public ObjectFactory createObjectFactory(SystemTargetDefinition target) throws WiringException {
        URI targetId = UriHelper.getDefragmentedName(target.getUri());
        SystemComponent targetComponent = (SystemComponent) manager.getComponent(targetId);
        return targetComponent.createObjectFactory();
    }
}