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/*
 * Copyright (c) 2016 ingenieux Labs
 *
 * 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 br.com.ingenieux.mojo.aws.util;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.ClientConfiguration;
import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.event.ProgressEvent;
import com.amazonaws.event.ProgressListener;
import com.amazonaws.event.ProgressListenerChain;
import com.amazonaws.regions.Region;
import com.amazonaws.services.s3.AmazonS3Client;
import com.amazonaws.services.s3.internal.Constants;
import com.amazonaws.services.s3.model.CopyObjectRequest;
import com.amazonaws.services.s3.model.DeleteObjectRequest;
import com.amazonaws.services.s3.model.PutObjectRequest;
import com.amazonaws.services.s3.model.PutObjectResult;
import com.amazonaws.services.s3.transfer.TransferManager;
import com.amazonaws.services.s3.transfer.TransferManagerConfiguration;
import com.amazonaws.services.s3.transfer.TransferProgress;
import com.amazonaws.services.s3.transfer.Upload;
import com.amazonaws.services.s3.transfer.internal.TransferManagerUtils;

import org.apache.commons.io.FileUtils;
import org.apache.commons.lang.StringUtils;

import java.util.Date;

public class BeanstalkerS3Client extends AmazonS3Client {

    private static final String BLANK_LINE = StringUtils.repeat(" ", 24);
    private boolean multipartUpload = true;
    private boolean silentUpload = false;
    private TransferManager transferManager;

    public BeanstalkerS3Client(AWSCredentialsProvider credentialsProvider,
                               ClientConfiguration clientConfiguration, Region region) {
        super(credentialsProvider, clientConfiguration);

        init(region);
    }

    public boolean isMultipartUpload() {
        return multipartUpload;
    }

    public void setMultipartUpload(boolean multipartUploadP) {
        this.multipartUpload = multipartUploadP;
    }

    public boolean isSilentUpload() {
        return silentUpload;
    }

    public void setSilentUpload(boolean silentUpload) {
        this.silentUpload = silentUpload;
    }

    protected void init(Region region) {
        transferManager = new TransferManager(this);
        TransferManagerConfiguration configuration = new TransferManagerConfiguration();
        configuration.setMultipartUploadThreshold(100 * Constants.KB);
        transferManager.setConfiguration(configuration);
        this.setRegion(region);
    }

    public TransferManager getTransferManager() {
        return transferManager;
    }

    public String asNumber(long bytesTransfered) {
        // Extra Pedantry: I love *-ibytes
        return FileUtils.byteCountToDisplaySize(bytesTransfered).replaceAll(
                "B$", "iB");
    }

    @Override
    public PutObjectResult putObject(PutObjectRequest req)
            throws AmazonClientException, AmazonServiceException {
        if (!multipartUpload) {
            return super.putObject(req);
        }

        final long contentLen = TransferManagerUtils.getContentLength(req);

        String tempFilename = req.getKey() + ".tmp";
        String origFilename = req.getKey();

        req.setKey(tempFilename);

        XProgressListener progressListener = new XProgressListener();

        req.setGeneralProgressListener(new ProgressListenerChain(progressListener));

        progressListener.setContentLen(contentLen);
        progressListener.setUpload(transferManager.upload(req));
        progressListener.setSilentUpload(silentUpload);

        try {
            progressListener.getUpload().waitForCompletion();
        } catch (InterruptedException e) {
            throw new AmazonClientException(e.getMessage(), e);
        }

        CopyObjectRequest copyReq = new CopyObjectRequest(req.getBucketName(), tempFilename,
                req.getBucketName(), origFilename);

        copyObject(copyReq);

        deleteObject(new DeleteObjectRequest(req.getBucketName(), tempFilename));

        return null;
    }

    public void deleteMultiparts(String bucketName, Date since) {
        transferManager.abortMultipartUploads(bucketName, since);
    }

    private final class XProgressListener implements ProgressListener {

        private long contentLen;
        private Upload upload;
        private boolean silentUpload;

        public void setContentLen(long contentLen) {
            this.contentLen = contentLen;
        }

        public void setSilentUpload(boolean silentUpload) {
            this.silentUpload = silentUpload;
        }

        public Upload getUpload() {
            return upload;
        }

        public void setUpload(Upload upload) {
            this.upload = upload;
        }

        @Override
        public void progressChanged(ProgressEvent e) {
            if (null == upload) {
                return;
            }

            TransferProgress xProgress = upload.getProgress();

            if (!silentUpload) {
                System.out.print("\r  "
                        + String.format("%.2f", xProgress.getPercentTransferred())
                        + "% " + asNumber(xProgress.getBytesTransferred()) + "/"
                        + asNumber(contentLen) + BLANK_LINE);
            }

            switch (e.getEventCode()) {
                case ProgressEvent.COMPLETED_EVENT_CODE: {
                    System.out.println("Done");
                    break;
                }
                case ProgressEvent.FAILED_EVENT_CODE: {
                    try {
                        AmazonClientException exc = upload.waitForException();

                        System.err.println("Unable to upload file: "
                                + exc.getMessage());
                    } catch (InterruptedException ignored) {
                    }
                    break;
                }
            }
        }
    }
}