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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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.
 *
 * 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.fabric3.implementation.system.provision.SystemWireTargetDefinition;
import org.fabric3.spi.classloader.ClassLoaderRegistry;
import org.fabric3.spi.container.ContainerException;
import org.fabric3.spi.container.builder.component.TargetWireAttacher;
import org.fabric3.spi.container.component.ComponentManager;
import org.fabric3.spi.container.objectfactory.ObjectFactory;
import org.fabric3.spi.container.wire.InvocationChain;
import org.fabric3.spi.container.wire.Wire;
import org.fabric3.spi.model.physical.PhysicalOperationDefinition;
import org.fabric3.spi.model.physical.PhysicalWireSourceDefinition;
import org.fabric3.spi.util.UriHelper;
import org.oasisopen.sca.annotation.EagerInit;
import org.oasisopen.sca.annotation.Reference;

/**
 *
 */
@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(PhysicalWireSourceDefinition source, SystemWireTargetDefinition target, Wire wire) throws ContainerException {
        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) {
                    throw new ContainerException("Implementation class not found", e);
                }
            }
            Method method;
            try {
                method = implementationClass.getMethod(operation.getName(), paramTypes);
            } catch (NoSuchMethodException e) {
                throw new ContainerException("No matching method found", e);
            }

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

    public void detach(PhysicalWireSourceDefinition source, SystemWireTargetDefinition target) throws ContainerException {
        throw new AssertionError();
    }

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