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/**
 * Copyright 2017 Zaradai
 * 
 * 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.
 */
package com.zaradai.gluon.transform;

import com.zaradai.gluon.MicroService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.TimeUnit;

public class LoggingTransformer extends SimpleTransformer {
    private static final Logger LOG = LoggerFactory.getLogger(LoggingTransformer.class);

    public static  LoggingTransformer create() {
        return new LoggingTransformer<>();
    }

    @Override
    public CompletableFuture apply(Req req, MicroService service) {
        long started = System.nanoTime();

        return service.apply(req).whenCompleteAsync((rep, error) -> {
            if (rep != null) {
                LOG.info("Returned: {} given input: {} after {} ms", rep, req, getElapsed(started));
            }
            if (error != null) {
                LOG.error("Threw: {} given input: {} after {} ms", error, req, getElapsed(started));
            }
        });
    }

    private static long getElapsed(long started) {
        return TimeUnit.NANOSECONDS.toMillis(System.nanoTime() - started);
    }
}