/*
 * Copyright 2010-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.mobileconnectors.s3.transfermanager.internal;

import com.amazonaws.AmazonClientException;
import com.amazonaws.AmazonServiceException;
import com.amazonaws.event.ProgressListenerChain;
import com.amazonaws.mobileconnectors.s3.transfermanager.PauseResult;
import com.amazonaws.mobileconnectors.s3.transfermanager.PauseStatus;
import com.amazonaws.mobileconnectors.s3.transfermanager.PersistableUpload;
import com.amazonaws.mobileconnectors.s3.transfermanager.TransferProgress;
import com.amazonaws.mobileconnectors.s3.transfermanager.Upload;
import com.amazonaws.mobileconnectors.s3.transfermanager.exception.PauseException;
import com.amazonaws.mobileconnectors.s3.transfermanager.model.UploadResult;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

public class UploadImpl extends AbstractTransfer implements Upload {

    public UploadImpl(String description, TransferProgress transferProgressInternalState,
            ProgressListenerChain progressListenerChain, TransferStateChangeListener listener) {
        super(description, transferProgressInternalState, progressListenerChain, listener);
    }

    /**
     * Waits for this upload to complete and returns the result of this upload.
     * Be prepared to handle errors when calling this method. Any errors that
     * occurred during the asynchronous transfer will be re-thrown through this
     * method.
     *
     * @return The result of this transfer.
     * @throws AmazonClientException If any errors were encountered in the client
     *             while making the request or handling the response.
     * @throws AmazonServiceException If any errors occurred in Amazon S3 while
     *             processing the request.
     * @throws InterruptedException If this thread is interrupted while waiting
     *             for the upload to complete.
     */
    @Override
    public UploadResult waitForUploadResult()
            throws AmazonClientException, AmazonServiceException, InterruptedException {
        try {
            UploadResult result = null;
            while (!monitor.isDone() || result == null) {
                Future<?> f = monitor.getFuture();
                result = (UploadResult) f.get();
            }
            return result;
        } catch (ExecutionException e) {
            rethrowExecutionException(e);
            return null;
        }
    }

    /*
     * (non-Javadoc)
     * @see com.amazonaws.mobileconnectors.s3.transfermanager.Upload#pause()
     */
    @Override
    public PersistableUpload pause() throws PauseException {
        PauseResult<PersistableUpload> pauseResult = pause(true);
        if (pauseResult.getPauseStatus() != PauseStatus.SUCCESS) {
            throw new PauseException(pauseResult.getPauseStatus());
        }
        return pauseResult.getInfoToResume();
    }

    /**
     * Tries to pause and return the information required to resume the upload
     * operation.
     */
    private PauseResult<PersistableUpload> pause(
            final boolean forceCancelTransfers) throws AmazonClientException {
        UploadMonitor uploadMonitor = (UploadMonitor) monitor;
        return uploadMonitor.pause(forceCancelTransfers);
    }

    /*
     * (non-Javadoc)
     * @see
     * com.amazonaws.mobileconnectors.s3.transfermanager.Upload#tryPause(boolean
     * )
     */
    @Override
    public PauseResult<PersistableUpload> tryPause(boolean forceCancelTransfers) {
        return pause(forceCancelTransfers);
    }

    /*
     * (non-Javadoc)
     * @see com.amazonaws.mobileconnectors.s3.transfermanager.Upload#abort()
     */
    @Override
    public void abort() {
        UploadMonitor uploadMonitor = (UploadMonitor) monitor;
        uploadMonitor.performAbort();
    }
}