/*
 * [Clump.java]
 *
 * Summary: Assigning all files to a zip.
 *
 * Copyright: (c) 2003-2017 Roedy Green, Canadian Mind Products, http://mindprod.com
 *
 * Licence: This software may be copied and used freely for any purpose but military.
 *          http://mindprod.com/contact/nonmil.html
 *
 * Requires: JDK 1.8+
 *
 * Created with: JetBrains IntelliJ IDEA IDE http://www.jetbrains.com/idea/
 *
 * Version History:
 *  8.5 2007-08-18
 */
package com.mindprod.replicatorsender;

import com.mindprod.sorted.Merge;

/**
 * Assigning all files to a zip.
 *
 * @author Roedy Green, Canadian Mind Products
 * @version 8.5 2007-08-18
 * @since 2003-03-23
 */
final class Clump
    {
    /**
     * make sure all files marked deleted and files to distribute have unique clumping numbers.
     */
    private static void ensureUniqueClumping()
        {
        ReplicatorSender.combinedFilesAndDeletions
                .sort( MaxiFD.BY_CLUMPING_AND_FILENAME );
        long prevClump = ConfigForSender.NULL_TIMESTAMP;
        for ( MaxiFD fd : ReplicatorSender.combinedFilesAndDeletions )
            {
            if ( fd.getClumping() <= prevClump )
                {
                fd.setClumping( ++prevClump );
                }
            else
                {
                prevClump = fd.getClumping();
                }
            }
        }

    /**
     * Assign files to zip files so that zip files will be roughly the right size.
     */
    public static void process()
        {
        // ensures/sorts filesToDistribute filesToDelete as side effect.
        ReplicatorSender.combinedFilesAndDeletions =
                Merge.union( ReplicatorSender.filesToDistribute,
                        ReplicatorSender.filesToDelete,
                        MaxiFD.BY_CLUMPING_AND_FILENAME );
        ensureUniqueClumping();
        final long limit = ConfigForSender.UNCOMPRESSED_IDEAL_ZIPSIZE;
        // Force a new jar right off the bat, will only be created if there were
        // new files.
        // force creating of a new zip on any new file or deletions to distribute
        MaxiZD zd = null;
        long fullness = Integer.MAX_VALUE / 2;
        for ( MaxiFD fd : ReplicatorSender.combinedFilesAndDeletions )
            {
            if ( fd.getZipNumber() != 0 )
                {
                continue;
                }
            final long length = fd.getFileLength();
            // Put it in same jar if it will fit under the limit
            // or if going over would get us closer to the ideal limit than
            // going under.
            if ( fullness + length <= limit
                 || fullness < limit
                    && limit - fullness >= fullness + length - limit )
                {
                // fit into this jar.
                fullness += length;
                }
            else
                {
                // fit into next jar
                fullness = length;
                zd = new MaxiZD();// will be an  UNCREATED_A;
                }
            // this will assign objects in the filesToDistribute and filesToDelete list as well.
            fd.assignZip( zd );
            } // end for
        // we leave filesToDistribute and filesToDelete sorted BY_CLUMPING_AND_FILENAME,
        // with all entries assigned to zips
        }
    } // end Clump.