/*
 *  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
 *
 *    https://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.grails.cli.compiler.grape;

import java.io.PrintStream;

import org.eclipse.aether.DefaultRepositorySystemSession;
import org.eclipse.aether.transfer.AbstractTransferListener;
import org.eclipse.aether.transfer.TransferCancelledException;
import org.eclipse.aether.transfer.TransferEvent;
import org.eclipse.aether.transfer.TransferResource;

/**
 * Provide detailed progress feedback for long running resolves.
 *
 * @author Andy Wilkinson
 */
final class DetailedProgressReporter implements ProgressReporter {

    DetailedProgressReporter(DefaultRepositorySystemSession session, final PrintStream out) {

        session.setTransferListener(new AbstractTransferListener() {

            @Override
            public void transferStarted(TransferEvent event) throws TransferCancelledException {
                out.println("Downloading: " + getResourceIdentifier(event.getResource()));
            }

            @Override
            public void transferSucceeded(TransferEvent event) {
                out.printf("Downloaded: %s (%s)%n", getResourceIdentifier(event.getResource()),
                        getTransferSpeed(event));
            }
        });
    }

    private String getResourceIdentifier(TransferResource resource) {
        return resource.getRepositoryUrl() + resource.getResourceName();
    }

    private String getTransferSpeed(TransferEvent event) {
        long kb = event.getTransferredBytes() / 1024;
        float seconds = (System.currentTimeMillis() - event.getResource().getTransferStartTime()) / 1000.0f;

        return String.format("%dKB at %.1fKB/sec", kb, (kb / seconds));
    }

    @Override
    public void finished() {
    }

}
