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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.binding.zeromq.generator;

import java.net.URI;
import java.util.Collection;
import java.util.List;

import org.fabric3.api.annotation.wire.Key;
import org.fabric3.api.binding.zeromq.model.ZeroMQBinding;
import org.fabric3.api.binding.zeromq.model.ZeroMQMetadata;
import org.fabric3.api.host.Fabric3Exception;
import org.fabric3.api.model.type.contract.Operation;
import org.fabric3.api.model.type.contract.ServiceContract;
import org.fabric3.binding.zeromq.provision.ZeroMQWireSource;
import org.fabric3.binding.zeromq.provision.ZeroMQWireTarget;
import org.fabric3.spi.domain.generator.WireBindingGenerator;
import org.fabric3.spi.model.instance.LogicalBinding;
import org.fabric3.spi.model.instance.LogicalComponent;
import org.fabric3.spi.model.instance.LogicalCompositeComponent;
import org.fabric3.spi.model.instance.LogicalOperation;
import org.fabric3.spi.model.instance.LogicalService;
import org.fabric3.spi.model.instance.LogicalState;
import org.fabric3.spi.util.UriHelper;
import org.oasisopen.sca.annotation.EagerInit;

/**
 *
 */
@EagerInit
@Key("org.fabric3.api.binding.zeromq.model.ZeroMQBinding")
public class ZeroMQWireBindingGenerator implements WireBindingGenerator {
    private static final String TARGET_URI = "targetUri";

    public ZeroMQWireSource generateSource(LogicalBinding binding, ServiceContract contract, List operations) {
        ZeroMQMetadata metadata = binding.getDefinition().getZeroMQMetadata();
        if (binding.isCallback()) {
            URI uri = URI.create("zmq://" + contract.getInterfaceName());
            return new ZeroMQWireSource(uri, metadata);
        } else {
            return new ZeroMQWireSource(metadata);
        }
    }

    public ZeroMQWireTarget generateTarget(LogicalBinding binding, ServiceContract contract, List operations) {
        validateServiceContract(contract);
        ZeroMQMetadata metadata = binding.getDefinition().getZeroMQMetadata();

        if (binding.isCallback()) {
            URI targetUri = URI.create("zmq://" + contract.getInterfaceName());
            return new ZeroMQWireTarget(targetUri, metadata);
        }
        URI targetUri;
        // If this is an undeployment, use the previously calculated target URI. This must be done since the target component may no longer
        // be in the domain if it has been undeployed from another zone.
        if (LogicalState.MARKED == binding.getState()) {
            targetUri = binding.getMetadata(TARGET_URI, URI.class);
        } else {
            targetUri = binding.getDefinition().getTargetUri();// parseTargetUri(binding);
            if (targetUri != null) {
                targetUri = URI.create(binding.getParent().getParent().getParent().getUri() + "/" + targetUri);
            } else {
                // create a synthetic name
                targetUri = URI.create("f3synthetic://" + binding.getParent().getUri() + "/" + binding.getDefinition().getName());
            }
            binding.addMetadata(TARGET_URI, targetUri);
        }
        return generateTarget(contract, targetUri, metadata);
    }

    private ZeroMQWireTarget generateTarget(ServiceContract contract, URI targetUri, ZeroMQMetadata metadata) {
        boolean hasCallback = contract.getCallbackContract() != null;
        if (hasCallback) {
            URI callbackUri = URI.create("zmq://" + contract.getCallbackContract().getInterfaceName());
            return new ZeroMQWireTarget(targetUri, callbackUri, metadata);
        }
        return new ZeroMQWireTarget(targetUri, metadata);
    }

    private void validateServiceContract(ServiceContract contract) {
        boolean oneway = false;
        boolean first = true;
        for (Operation operation : contract.getOperations()) {
            if (first) {
                oneway = operation.isOneWay();
                first = false;
            } else {
                if ((!oneway && operation.isOneWay()) || (oneway && !operation.isOneWay())) {
                    String name = contract.getInterfaceName();
                    throw new Fabric3Exception("The ZeroMQ binding does not support mixing one-way and request-response operations: " + name);
                }
            }
        }
    }

}