/*
 * 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.wayang.iejoin.test;

import org.junit.Before;
import org.apache.wayang.core.api.Configuration;
import org.apache.wayang.core.plan.executionplan.Channel;
import org.apache.wayang.core.platform.ChannelDescriptor;
import org.apache.wayang.core.util.WayangCollections;
import org.apache.wayang.java.channels.CollectionChannel;
import org.apache.wayang.java.channels.StreamChannel;
import org.apache.wayang.java.execution.JavaExecutor;
import org.apache.wayang.spark.channels.RddChannel;
import org.apache.wayang.spark.execution.SparkExecutor;

import java.util.Collection;
import java.util.stream.Stream;

import static org.mockito.Mockito.mock;

/**
 * Utility to create {@link Channel}s in tests.
 */
public class ChannelFactory {

    private static SparkExecutor sparkExecutor;

    private static JavaExecutor javaExecutor;

    @Before
    public void setUp() {
        sparkExecutor = mock(SparkExecutor.class);
        javaExecutor = mock(JavaExecutor.class);
    }

    public static RddChannel.Instance createRddChannelInstance(ChannelDescriptor rddChannelDescriptor, Configuration configuration) {
        return (RddChannel.Instance) rddChannelDescriptor
                .createChannel(null, configuration)
                .createInstance(sparkExecutor, null, -1);
    }

    public static RddChannel.Instance createRddChannelInstance(Configuration configuration) {
        return createRddChannelInstance(RddChannel.UNCACHED_DESCRIPTOR, configuration);
    }

    public static RddChannel.Instance createRddChannelInstance(Collection<?> data,
                                                               SparkExecutor sparkExecutor,
                                                               Configuration configuration) {
        RddChannel.Instance instance = createRddChannelInstance(configuration);
        instance.accept(sparkExecutor.sc.parallelize(WayangCollections.asList(data)), sparkExecutor);
        return instance;
    }

    public static StreamChannel.Instance createStreamChannelInstance(Configuration configuration) {
        return (StreamChannel.Instance) StreamChannel.DESCRIPTOR
                .createChannel(null, configuration)
                .createInstance(javaExecutor, null, -1);
    }

    public static StreamChannel.Instance createStreamChannelInstance(Stream<?> stream, Configuration configuration) {
        StreamChannel.Instance instance = createStreamChannelInstance(configuration);
        instance.accept(stream);
        return instance;
    }

    public static CollectionChannel.Instance createCollectionChannelInstance(Configuration configuration) {
        return (CollectionChannel.Instance) CollectionChannel.DESCRIPTOR
                .createChannel(null, configuration)
                .createInstance(javaExecutor, null, -1);
    }

    public static CollectionChannel.Instance createCollectionChannelInstance(Collection<?> collection, Configuration configuration) {
        CollectionChannel.Instance instance = createCollectionChannelInstance(configuration);
        instance.accept(collection);
        return instance;
    }

}