/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.ignite.tensorflow.cluster.tfrunning;

import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.ignite.Ignite;
import org.apache.ignite.Ignition;
import org.apache.ignite.tensorflow.cluster.spec.TensorFlowClusterSpec;
import org.apache.ignite.tensorflow.cluster.spec.TensorFlowServerAddressSpec;
import org.apache.ignite.tensorflow.cluster.util.TensorFlowProcessBuilderSupplier;
import org.apache.ignite.tensorflow.core.ProcessManager;
import org.apache.ignite.tensorflow.core.ProcessManagerWrapper;
import org.apache.ignite.tensorflow.core.nativerunning.NativeProcess;
import org.apache.ignite.tensorflow.core.nativerunning.NativeProcessManager;

/**
 * TensorFlow server manager that allows to start, stop and make other actions with TensorFlow servers.
 */
public class TensorFlowServerManager extends ProcessManagerWrapper<NativeProcess, TensorFlowServer> {
    /** TensorFlow server script formatter. */
    private static final TensorFlowServerScriptFormatter scriptFormatter = new TensorFlowServerScriptFormatter();

    /**
     * Constructs a new instance of TensorFlow server manager.
     *
     * @param ignite Ignite instance.
     */
    public TensorFlowServerManager(Ignite ignite) {
        this(new NativeProcessManager(ignite));
    }

    /**
     * Constructs a new instance of TensorFlow server manager.
     *
     * @param delegate Delegate.
     */
    public TensorFlowServerManager(ProcessManager<NativeProcess> delegate) {
        super(delegate);
    }

    /** {@inheritDoc} */
    @Override protected NativeProcess transformSpecification(TensorFlowServer spec) {
        return new NativeProcess(
            new TensorFlowProcessBuilderSupplier(
                true,
                true,
                "job:" + spec.getJobName(),
                "task:" + spec.getTaskIdx()
            ),
            scriptFormatter.format(spec, true, Ignition.ignite()),
            getNode(spec)
        );
    }

    /**
     * Extracts the cluster node server should be running on.
     *
     * @param spec TensorFlow server specification.
     * @return Node identifier.
     */
    private UUID getNode(TensorFlowServer spec) {
        TensorFlowClusterSpec clusterSpec = spec.getClusterSpec();
        Map<String, List<TensorFlowServerAddressSpec>> jobs = clusterSpec.getJobs();
        List<TensorFlowServerAddressSpec> tasks = jobs.get(spec.getJobName());
        TensorFlowServerAddressSpec addr = tasks.get(spec.getTaskIdx());

        return addr.getNodeId();
    }
}