// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0

// snippet-start:[kinesisanalytics.java.example.streams-sink]

package com.amazonaws.services.kinesisanalytics;

import com.amazonaws.services.kinesisanalytics.runtime.KinesisAnalyticsRuntime;
import org.apache.flink.api.common.serialization.SimpleStringSchema;
import org.apache.flink.streaming.api.datastream.DataStream;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.connectors.kinesis.FlinkKinesisConsumer;
import org.apache.flink.streaming.connectors.kinesis.FlinkKinesisProducer;
import org.apache.flink.streaming.connectors.kinesis.config.ConsumerConfigConstants;

import java.io.IOException;
import java.util.Map;
import java.util.Properties;

public class StreamingJob {

    private static final String region = "us-east-1";
    private static final String inputStreamName = "ExampleInputStream";
    private static final String outputStreamName = "ExampleOutputStream";

    private static DataStream<String> createSourceFromStaticConfig(StreamExecutionEnvironment env) {
        Properties inputProperties = new Properties();
        inputProperties.setProperty(ConsumerConfigConstants.AWS_REGION, region);
        inputProperties.setProperty(ConsumerConfigConstants.STREAM_INITIAL_POSITION, "LATEST");

        return env.addSource(new FlinkKinesisConsumer<>(inputStreamName, new SimpleStringSchema(), inputProperties));
    }

    private static DataStream<String> createSourceFromApplicationProperties(StreamExecutionEnvironment env)
            throws IOException {
        Map<String, Properties> applicationProperties = KinesisAnalyticsRuntime.getApplicationProperties();
        return env.addSource(new FlinkKinesisConsumer<>(inputStreamName, new SimpleStringSchema(),
                applicationProperties.get("ConsumerConfigProperties")));
    }

    private static FlinkKinesisProducer<String> createSinkFromStaticConfig() {
        Properties outputProperties = new Properties();
        outputProperties.setProperty(ConsumerConfigConstants.AWS_REGION, region);
        outputProperties.setProperty("AggregationEnabled", "false");

        FlinkKinesisProducer<String> sink = new FlinkKinesisProducer<>(new SimpleStringSchema(), outputProperties);
        sink.setDefaultStream(outputStreamName);
        sink.setDefaultPartition("0");
        return sink;
    }

    private static FlinkKinesisProducer<String> createSinkFromApplicationProperties() throws IOException {
        Map<String, Properties> applicationProperties = KinesisAnalyticsRuntime.getApplicationProperties();
        FlinkKinesisProducer<String> sink = new FlinkKinesisProducer<>(new SimpleStringSchema(),
                applicationProperties.get("ProducerConfigProperties"));

        sink.setDefaultStream(outputStreamName);
        sink.setDefaultPartition("0");
        return sink;
    }

    public static void main(String[] args) throws Exception {
        // set up the streaming execution environment
        final StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment();

        /*
         * if you would like to use runtime configuration properties, uncomment the
         * lines below
         * DataStream<String> input = createSourceFromApplicationProperties(env);
         */

        DataStream<String> input = createSourceFromStaticConfig(env);

        /*
         * if you would like to use runtime configuration properties, uncomment the
         * lines below
         * input.addSink(createSinkFromApplicationProperties())
         */

        input.addSink(createSinkFromStaticConfig());

        env.execute("Flink Streaming Java API Skeleton");
    }
}

// snippet-end:[kinesisanalytics.java.example.streams-sink]