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/*
 * Copyright (c) 2013, salesforce.com, inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided
 * that the following conditions are met:
 *
 *    Redistributions of source code must retain the above copyright notice, this list of conditions and the
 *    following disclaimer.
 *
 *    Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
 *    the following disclaimer in the documentation and/or other materials provided with the distribution.
 *
 *    Neither the name of salesforce.com, inc. nor the names of its contributors may be used to endorse or
 *    promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

package com.sforce.bulk;

import com.sforce.async.*;

import java.io.ByteArrayInputStream;
import java.io.StringWriter;

/**
 * This class represents
 * 
 * User: mcheenath
 * Date: Dec 10, 2010
 */
public class UpdateStream {

    private StreamHandler handler;
    private JobInfo job;
    private BulkConnection bulkConnection;
    private String[] fieldNames;
    private StringWriter writer;
    private CsvWriter csvWriter;
    private int recordCount;

    public static UpdateStream create(StreamHandler handler) throws StreamException {
        return new UpdateStream(handler);
    }

    private UpdateStream(StreamHandler handler) throws StreamException {
        this.handler = handler;

        if (handler.getConfig().getAuthEndpoint() == null) {
            throw new StreamException("AuthEndpoint not set in config");
        }

        if (!handler.getConfig().getAuthEndpoint().contains("/services/Soap/u/")) {
            throw new StreamException("Not a valid partner AuthEndpoint " + handler.getConfig().getAuthEndpoint() +
                    " This URL should contain /services/Soap/u/");
        }

        LoginHelper loginHelper = new LoginHelper(handler);


        while(handler.shouldContinue()) {
            try {
                loginHelper.doLogin();
                break;
            } catch (Throwable e) {
                handler.error("Failed to login ", e);
            }
        }


    }

    public void start(String object, OperationEnum operation, ConcurrencyMode concurrencyMode, String[] fieldNames)
            throws StreamException {

        if (fieldNames == null || fieldNames.length == 0) {
            throw new StreamException("field names can not be null/empty");
        }

        this.fieldNames = fieldNames;

        while(handler.shouldContinue()) {
            try {
                bulkConnection = new BulkConnection(handler.getConfig());

                job = new JobInfo();
                job.setObject(object);

                job.setOperation(operation);
                job.setConcurrencyMode(concurrencyMode);
                job.setContentType(ContentType.CSV);

                handler.info("Creating bulk api job");
                job = bulkConnection.createJob(job);

                handler.info("Bulk api job created with ID : " + job.getId());
                break;
            } catch (Throwable e) {
                handler.error("Failed to create job ", e);
            }
        }
    }

    public UpdateResultStream close() throws StreamException {
        if (writer != null) {
            createBatch();
        }

        while(handler.shouldContinue()) {
            try {
                handler.info("Closing job");
                job = bulkConnection.closeJob(job.getId());
                handler.info("Job closed");
                break;
            } catch (Throwable e) {
                handler.error("Failed to close job ", e);
            }
        }

        return new UpdateResultStream(handler, bulkConnection, job);
    }

    public void write(String ... values) throws StreamException {
        if (job == null) {
            throw new StreamException("start() not called");
        }

        if (writer == null) {
            writer = new StringWriter();
            csvWriter = new CsvWriter(fieldNames, writer);
        }

        csvWriter.writeRecord(values);
        recordCount++;

        if (recordCount > handler.getMaxRecordsInBatch()) {
            csvWriter.endDocument();
            createBatch();
        }
    }

    private void createBatch() throws StreamException {
        while(handler.shouldContinue()) {
            try {
                handler.info("Creating Batch");

                BatchInfo batch = bulkConnection.createBatchFromStream(job,
                        new ByteArrayInputStream(writer.getBuffer().toString().getBytes()));

                handler.info("Batch created with ID: " + batch.getId());
                writer = null;
                csvWriter = null;
                recordCount = 0;

                break;
            } catch (Throwable e) {
                handler.error("Failed to close job ", e);
            }
        }
    }
}