C4/HoldsQueue.pm

   1 package C4::HoldsQueue;
   2
   3 # Copyright 2011 Catalyst IT
   4 #
   5 # This file is part of Koha.
   6 #
   7 # Koha is free software; you can redistribute it and/or modify it
   8 # under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 3 of the License, or
  10 # (at your option) any later version.
  11 #
  12 # Koha is distributed in the hope that it will be useful, but
  13 # WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
  19
  20 # FIXME: expand perldoc, explain intended logic
  21
  22 use strict;
  23 use warnings;
  24
  25 use C4::Context;
  26 use C4::Search;
  27 use C4::Items;
  28 use C4::Branch;
  29 use C4::Circulation;
  30 use C4::Members;
  31 use C4::Biblio;
  32 use Koha::DateUtils;
  33
  34 use List::Util qw(shuffle);
  35 use List::MoreUtils qw(any);
  36 use Data::Dumper;
  37
  38 use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);
  39 BEGIN {
  40     require Exporter;
  41     @ISA = qw(Exporter);
  42     @EXPORT_OK = qw(
  43         &CreateQueue
  44         &GetHoldsQueueItems
  45
  46         &TransportCostMatrix
  47         &UpdateTransportCostMatrix
  48      );
  49 }
  50
  51
  52 =head1 FUNCTIONS
  53
  54 =head2 TransportCostMatrix
  55
  56   TransportCostMatrix();
  57
  58 Returns Transport Cost Matrix as a hashref <to branch code> => <from branch code> => cost
  59
  60 =cut
  61
  62 sub TransportCostMatrix {
  63     my $dbh   = C4::Context->dbh;
  64     my $transport_costs = $dbh->selectall_arrayref("SELECT * FROM transport_cost",{ Slice => {} });
  65
  66     my $today = dt_from_string();
  67     my $calendars;
  68     my %transport_cost_matrix;
  69     foreach (@$transport_costs) {
  70         my $from     = $_->{frombranch};
  71         my $to       = $_->{tobranch};
  72         my $cost     = $_->{cost};
  73         my $disabled = $_->{disable_transfer};
  74         $transport_cost_matrix{$to}{$from} = {
  75             cost             => $cost,
  76             disable_transfer => $disabled
  77         };
  78
  79         if ( C4::Context->preference("HoldsQueueSkipClosed") ) {
  80             $calendars->{$from} ||= Koha::Calendar->new( branchcode => $from );
  81             $transport_cost_matrix{$to}{$from}{disable_transfer} ||=
  82               $calendars->{$from}->is_holiday( $today );
  83         }
  84
  85     }
  86     return \%transport_cost_matrix;
  87 }
  88
  89 =head2 UpdateTransportCostMatrix
  90
  91   UpdateTransportCostMatrix($records);
  92
  93 Updates full Transport Cost Matrix table. $records is an arrayref of records.
  94 Records: { frombranch => <code>, tobranch => <code>, cost => <figure>, disable_transfer => <0,1> }
  95
  96 =cut
  97
  98 sub UpdateTransportCostMatrix {
  99     my ($records) = @_;
 100     my $dbh   = C4::Context->dbh;
 101
 102     my $sth = $dbh->prepare("INSERT INTO transport_cost (frombranch, tobranch, cost, disable_transfer) VALUES (?, ?, ?, ?)");
 103
 104     $dbh->do("TRUNCATE TABLE transport_cost");
 105     foreach (@$records) {
 106         my $cost = $_->{cost};
 107         my $from = $_->{frombranch};
 108         my $to = $_->{tobranch};
 109         if ($_->{disable_transfer}) {
 110             $cost ||= 0;
 111         }
 112         elsif ( !defined ($cost) || ($cost !~ m/(0|[1-9][0-9]*)(\.[0-9]*)?/o) ) {
 113             warn  "Invalid $from -> $to cost $cost - must be a number >= 0, disablig";
 114             $cost = 0;
 115             $_->{disable_transfer} = 1;
 116         }
 117         $sth->execute( $from, $to, $cost, $_->{disable_transfer} ? 1 : 0 );
 118     }
 119 }
 120
 121 =head2 GetHoldsQueueItems
 122
 123   GetHoldsQueueItems($branch);
 124
 125 Returns hold queue for a holding branch. If branch is omitted, then whole queue is returned
 126
 127 =cut
 128
 129 sub GetHoldsQueueItems {
 130     my ($branchlimit) = @_;
 131     my $dbh   = C4::Context->dbh;
 132
 133     my @bind_params = ();
 134     my $query = q/SELECT tmp_holdsqueue.*, biblio.author, items.ccode, items.itype, biblioitems.itemtype, items.location, items.enumchron, items.cn_sort, biblioitems.publishercode,biblio.copyrightdate,biblioitems.publicationyear,biblioitems.pages,biblioitems.size,biblioitems.publicationyear,biblioitems.isbn,items.copynumber
 135                   FROM tmp_holdsqueue
 136                        JOIN biblio      USING (biblionumber)
 137                   LEFT JOIN biblioitems USING (biblionumber)
 138                   LEFT JOIN items       USING (  itemnumber)
 139                 /;
 140     if ($branchlimit) {
 141         $query .=" WHERE tmp_holdsqueue.holdingbranch = ?";
 142         push @bind_params, $branchlimit;
 143     }
 144     $query .= " ORDER BY ccode, location, cn_sort, author, title, pickbranch, reservedate";
 145     my $sth = $dbh->prepare($query);
 146     $sth->execute(@bind_params);
 147     my $items = [];
 148     while ( my $row = $sth->fetchrow_hashref ){
 149         my $record = GetMarcBiblio($row->{biblionumber});
 150         if ($record){
 151             $row->{subtitle} = [ map { $_->{subfield} } @{ GetRecordValue( 'subtitle', $record, '' ) } ];
 152             $row->{parts} = GetRecordValue('parts',$record,'')->[0]->{subfield};
 153             $row->{numbers} = GetRecordValue('numbers',$record,'')->[0]->{subfield};
 154         }
 155
 156         # return the bib-level or item-level itype per syspref
 157         if (!C4::Context->preference('item-level_itypes')) {
 158             $row->{itype} = $row->{itemtype};
 159         }
 160         delete $row->{itemtype};
 161
 162         push @$items, $row;
 163     }
 164     return $items;
 165 }
 166
 167 =head2 CreateQueue
 168
 169   CreateQueue();
 170
 171 Top level function that turns reserves into tmp_holdsqueue and hold_fill_targets.
 172
 173 =cut
 174
 175 sub CreateQueue {
 176     my $dbh   = C4::Context->dbh;
 177
 178     $dbh->do("DELETE FROM tmp_holdsqueue");  # clear the old table for new info
 179     $dbh->do("DELETE FROM hold_fill_targets");
 180
 181     my $total_bibs            = 0;
 182     my $total_requests        = 0;
 183     my $total_available_items = 0;
 184     my $num_items_mapped      = 0;
 185
 186     my $branches_to_use;
 187     my $transport_cost_matrix;
 188     my $use_transport_cost_matrix = C4::Context->preference("UseTransportCostMatrix");
 189     if ($use_transport_cost_matrix) {
 190         $transport_cost_matrix = TransportCostMatrix();
 191         unless (keys %$transport_cost_matrix) {
 192             warn "UseTransportCostMatrix set to yes, but matrix not populated";
 193             undef $transport_cost_matrix;
 194         }
 195     }
 196     unless ($transport_cost_matrix) {
 197         $branches_to_use = load_branches_to_pull_from();
 198     }
 199
 200     my $bibs_with_pending_requests = GetBibsWithPendingHoldRequests();
 201
 202     foreach my $biblionumber (@$bibs_with_pending_requests) {
 203         $total_bibs++;
 204         my $hold_requests   = GetPendingHoldRequestsForBib($biblionumber);
 205         my $available_items = GetItemsAvailableToFillHoldRequestsForBib($biblionumber, $branches_to_use);
 206         $total_requests        += scalar(@$hold_requests);
 207         $total_available_items += scalar(@$available_items);
 208
 209         my $item_map = MapItemsToHoldRequests($hold_requests, $available_items, $branches_to_use, $transport_cost_matrix);
 210         $item_map  or next;
 211         my $item_map_size = scalar(keys %$item_map)
 212           or next;
 213
 214         $num_items_mapped += $item_map_size;
 215         CreatePicklistFromItemMap($item_map);
 216         AddToHoldTargetMap($item_map);
 217         if (($item_map_size < scalar(@$hold_requests  )) and
 218             ($item_map_size < scalar(@$available_items))) {
 219             # DOUBLE CHECK, but this is probably OK - unfilled item-level requests
 220             # FIXME
 221             #warn "unfilled requests for $biblionumber";
 222             #warn Dumper($hold_requests), Dumper($available_items), Dumper($item_map);
 223         }
 224     }
 225 }
 226
 227 =head2 GetBibsWithPendingHoldRequests
 228
 229   my $biblionumber_aref = GetBibsWithPendingHoldRequests();
 230
 231 Return an arrayref of the biblionumbers of all bibs
 232 that have one or more unfilled hold requests.
 233
 234 =cut
 235
 236 sub GetBibsWithPendingHoldRequests {
 237     my $dbh = C4::Context->dbh;
 238
 239     my $bib_query = "SELECT DISTINCT biblionumber
 240                      FROM reserves
 241                      WHERE found IS NULL
 242                      AND priority > 0
 243                      AND reservedate <= CURRENT_DATE()
 244                      AND suspend = 0
 245                      ";
 246     my $sth = $dbh->prepare($bib_query);
 247
 248     $sth->execute();
 249     my $biblionumbers = $sth->fetchall_arrayref();
 250
 251     return [ map { $_->[0] } @$biblionumbers ];
 252 }
 253
 254 =head2 GetPendingHoldRequestsForBib
 255
 256   my $requests = GetPendingHoldRequestsForBib($biblionumber);
 257
 258 Returns an arrayref of hashrefs to pending, unfilled hold requests
 259 on the bib identified by $biblionumber.  The following keys
 260 are present in each hashref:
 261
 262     biblionumber
 263     borrowernumber
 264     itemnumber
 265     priority
 266     branchcode
 267     reservedate
 268     reservenotes
 269     borrowerbranch
 270
 271 The arrayref is sorted in order of increasing priority.
 272
 273 =cut
 274
 275 sub GetPendingHoldRequestsForBib {
 276     my $biblionumber = shift;
 277
 278     my $dbh = C4::Context->dbh;
 279
 280     my $request_query = "SELECT biblionumber, borrowernumber, itemnumber, priority, reserves.branchcode,
 281                                 reservedate, reservenotes, borrowers.branchcode AS borrowerbranch
 282                          FROM reserves
 283                          JOIN borrowers USING (borrowernumber)
 284                          WHERE biblionumber = ?
 285                          AND found IS NULL
 286                          AND priority > 0
 287                          AND reservedate <= CURRENT_DATE()
 288                          AND suspend = 0
 289                          ORDER BY priority";
 290     my $sth = $dbh->prepare($request_query);
 291     $sth->execute($biblionumber);
 292
 293     my $requests = $sth->fetchall_arrayref({});
 294     return $requests;
 295
 296 }
 297
 298 =head2 GetItemsAvailableToFillHoldRequestsForBib
 299
 300   my $available_items = GetItemsAvailableToFillHoldRequestsForBib($biblionumber, $branches_ar);
 301
 302 Returns an arrayref of items available to fill hold requests
 303 for the bib identified by C<$biblionumber>.  An item is available
 304 to fill a hold request if and only if:
 305
 306     * it is not on loan
 307     * it is not withdrawn
 308     * it is not marked notforloan
 309     * it is not currently in transit
 310     * it is not lost
 311     * it is not sitting on the hold shelf
 312     * it is not damaged (unless AllowHoldsOnDamagedItems is on)
 313
 314 =cut
 315
 316 sub GetItemsAvailableToFillHoldRequestsForBib {
 317     my ($biblionumber, $branches_to_use) = @_;
 318
 319     my $dbh = C4::Context->dbh;
 320     my $items_query = "SELECT itemnumber, homebranch, holdingbranch, itemtypes.itemtype AS itype
 321                        FROM items ";
 322
 323     if (C4::Context->preference('item-level_itypes')) {
 324         $items_query .=   "LEFT JOIN itemtypes ON (itemtypes.itemtype = items.itype) ";
 325     } else {
 326         $items_query .=   "JOIN biblioitems USING (biblioitemnumber)
 327                            LEFT JOIN itemtypes USING (itemtype) ";
 328     }
 329     $items_query .=   "WHERE items.notforloan = 0
 330                        AND holdingbranch IS NOT NULL
 331                        AND itemlost = 0
 332                        AND withdrawn = 0";
 333     $items_query .= "  AND damaged = 0" unless C4::Context->preference('AllowHoldsOnDamagedItems');
 334     $items_query .= "  AND items.onloan IS NULL
 335                        AND (itemtypes.notforloan IS NULL OR itemtypes.notforloan = 0)
 336                        AND itemnumber NOT IN (
 337                            SELECT itemnumber
 338                            FROM reserves
 339                            WHERE biblionumber = ?
 340                            AND itemnumber IS NOT NULL
 341                            AND (found IS NOT NULL OR priority = 0)
 342                         )
 343                        AND items.biblionumber = ?";
 344
 345     my @params = ($biblionumber, $biblionumber);
 346     if ($branches_to_use && @$branches_to_use) {
 347         $items_query .= " AND holdingbranch IN (" . join (",", map { "?" } @$branches_to_use) . ")";
 348         push @params, @$branches_to_use;
 349     }
 350     my $sth = $dbh->prepare($items_query);
 351     $sth->execute(@params);
 352
 353     my $itm = $sth->fetchall_arrayref({});
 354     my @items = grep { ! scalar GetTransfers($_->{itemnumber}) } @$itm;
 355     return [ grep {
 356         my $rule = GetBranchItemRule($_->{homebranch}, $_->{itype});
 357         $_->{holdallowed} = $rule->{holdallowed};
 358     } @items ];
 359 }
 360
 361 =head2 MapItemsToHoldRequests
 362
 363   MapItemsToHoldRequests($hold_requests, $available_items, $branches, $transport_cost_matrix)
 364
 365 =cut
 366
 367 sub MapItemsToHoldRequests {
 368     my ($hold_requests, $available_items, $branches_to_use, $transport_cost_matrix) = @_;
 369
 370     # handle trival cases
 371     return unless scalar(@$hold_requests) > 0;
 372     return unless scalar(@$available_items) > 0;
 373
 374     # identify item-level requests
 375     my %specific_items_requested = map { $_->{itemnumber} => 1 }
 376                                    grep { defined($_->{itemnumber}) }
 377                                    @$hold_requests;
 378
 379     # group available items by itemnumber
 380     my %items_by_itemnumber = map { $_->{itemnumber} => $_ } @$available_items;
 381
 382     # items already allocated
 383     my %allocated_items = ();
 384
 385     # map of items to hold requests
 386     my %item_map = ();
 387
 388     # figure out which item-level requests can be filled
 389     my $num_items_remaining = scalar(@$available_items);
 390     foreach my $request (@$hold_requests) {
 391         last if $num_items_remaining == 0;
 392
 393         # is this an item-level request?
 394         if (defined($request->{itemnumber})) {
 395             # fill it if possible; if not skip it
 396             if (exists $items_by_itemnumber{$request->{itemnumber}} and
 397                 not exists $allocated_items{$request->{itemnumber}}) {
 398                 $item_map{$request->{itemnumber}} = {
 399                     borrowernumber => $request->{borrowernumber},
 400                     biblionumber => $request->{biblionumber},
 401                     holdingbranch =>  $items_by_itemnumber{$request->{itemnumber}}->{holdingbranch},
 402                     pickup_branch => $request->{branchcode} || $request->{borrowerbranch},
 403                     item_level => 1,
 404                     reservedate => $request->{reservedate},
 405                     reservenotes => $request->{reservenotes},
 406                 };
 407                 $allocated_items{$request->{itemnumber}}++;
 408                 $num_items_remaining--;
 409             }
 410         } else {
 411             # it's title-level request that will take up one item
 412             $num_items_remaining--;
 413         }
 414     }
 415
 416     # group available items by branch
 417     my %items_by_branch = ();
 418     foreach my $item (@$available_items) {
 419         next unless $item->{holdallowed};
 420
 421         push @{ $items_by_branch{ $item->{holdingbranch} } }, $item
 422           unless exists $allocated_items{ $item->{itemnumber} };
 423     }
 424     return \%item_map unless keys %items_by_branch;
 425
 426     # now handle the title-level requests
 427     $num_items_remaining = scalar(@$available_items) - scalar(keys %allocated_items);
 428     my $pull_branches;
 429     foreach my $request (@$hold_requests) {
 430         last if $num_items_remaining == 0;
 431         next if defined($request->{itemnumber}); # already handled these
 432
 433         # look for local match first
 434         my $pickup_branch = $request->{branchcode} || $request->{borrowerbranch};
 435         my ($itemnumber, $holdingbranch);
 436
 437         my $holding_branch_items = $items_by_branch{$pickup_branch};
 438         if ( $holding_branch_items ) {
 439             foreach my $item (@$holding_branch_items) {
 440                 if ( $request->{borrowerbranch} eq $item->{homebranch} ) {
 441                     $itemnumber = $item->{itemnumber};
 442                     last;
 443                 }
 444             }
 445             $holdingbranch = $pickup_branch;
 446         }
 447         elsif ($transport_cost_matrix) {
 448             $pull_branches = [keys %items_by_branch];
 449             $holdingbranch = least_cost_branch( $pickup_branch, $pull_branches, $transport_cost_matrix );
 450             if ( $holdingbranch ) {
 451
 452                 my $holding_branch_items = $items_by_branch{$holdingbranch};
 453                 foreach my $item (@$holding_branch_items) {
 454                     next if $request->{borrowerbranch} ne $item->{homebranch};
 455
 456                     $itemnumber = $item->{itemnumber};
 457                     last;
 458                 }
 459             }
 460             else {
 461                 next;
 462             }
 463         }
 464
 465         unless ($itemnumber) {
 466             # not found yet, fall back to basics
 467             if ($branches_to_use) {
 468                 $pull_branches = $branches_to_use;
 469             } else {
 470                 $pull_branches = [keys %items_by_branch];
 471             }
 472
 473             # Try picking items where the home and pickup branch match first
 474             PULL_BRANCHES:
 475             foreach my $branch (@$pull_branches) {
 476                 my $holding_branch_items = $items_by_branch{$branch}
 477                   or next;
 478
 479                 $holdingbranch ||= $branch;
 480                 foreach my $item (@$holding_branch_items) {
 481                     next if $pickup_branch ne $item->{homebranch};
 482                     next if ( $item->{holdallowed} == 1 && $item->{homebranch} ne $request->{borrowerbranch} );
 483
 484                     $itemnumber = $item->{itemnumber};
 485                     $holdingbranch = $branch;
 486                     last PULL_BRANCHES;
 487                 }
 488             }
 489
 490             # Now try items from the least cost branch based on the transport cost matrix or StaticHoldsQueueWeight
 491             unless ( $itemnumber ) {
 492                 foreach my $current_item ( @{ $items_by_branch{$holdingbranch} } ) {
 493                     if ( $holdingbranch && ( $current_item->{holdallowed} == 2 || $request->{borrowerbranch} eq $current_item->{homebranch} ) ) {
 494                         $itemnumber = $current_item->{itemnumber};
 495                         last; # quit this loop as soon as we have a suitable item
 496                     }
 497                 }
 498             }
 499
 500             # Now try for items for any item that can fill this hold
 501             unless ( $itemnumber ) {
 502                 PULL_BRANCHES2:
 503                 foreach my $branch (@$pull_branches) {
 504                     my $holding_branch_items = $items_by_branch{$branch}
 505                       or next;
 506
 507                     foreach my $item (@$holding_branch_items) {
 508                         next if ( $item->{holdallowed} == 1 && $item->{homebranch} ne $request->{borrowerbranch} );
 509
 510                         $itemnumber = $item->{itemnumber};
 511                         $holdingbranch = $branch;
 512                         last PULL_BRANCHES2;
 513                     }
 514                 }
 515             }
 516         }
 517
 518         if ($itemnumber) {
 519             my $holding_branch_items = $items_by_branch{$holdingbranch}
 520               or die "Have $itemnumber, $holdingbranch, but no items!";
 521             @$holding_branch_items = grep { $_->{itemnumber} != $itemnumber } @$holding_branch_items;
 522             delete $items_by_branch{$holdingbranch} unless @$holding_branch_items;
 523
 524             $item_map{$itemnumber} = {
 525                 borrowernumber => $request->{borrowernumber},
 526                 biblionumber => $request->{biblionumber},
 527                 holdingbranch => $holdingbranch,
 528                 pickup_branch => $pickup_branch,
 529                 item_level => 0,
 530                 reservedate => $request->{reservedate},
 531                 reservenotes => $request->{reservenotes},
 532             };
 533             $num_items_remaining--;
 534         }
 535     }
 536     return \%item_map;
 537 }
 538
 539 =head2 CreatePickListFromItemMap
 540
 541 =cut
 542
 543 sub CreatePicklistFromItemMap {
 544     my $item_map = shift;
 545
 546     my $dbh = C4::Context->dbh;
 547
 548     my $sth_load=$dbh->prepare("
 549         INSERT INTO tmp_holdsqueue (biblionumber,itemnumber,barcode,surname,firstname,phone,borrowernumber,
 550                                     cardnumber,reservedate,title, itemcallnumber,
 551                                     holdingbranch,pickbranch,notes, item_level_request)
 552         VALUES (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)
 553     ");
 554
 555     foreach my $itemnumber  (sort keys %$item_map) {
 556         my $mapped_item = $item_map->{$itemnumber};
 557         my $biblionumber = $mapped_item->{biblionumber};
 558         my $borrowernumber = $mapped_item->{borrowernumber};
 559         my $pickbranch = $mapped_item->{pickup_branch};
 560         my $holdingbranch = $mapped_item->{holdingbranch};
 561         my $reservedate = $mapped_item->{reservedate};
 562         my $reservenotes = $mapped_item->{reservenotes};
 563         my $item_level = $mapped_item->{item_level};
 564
 565         my $item = GetItem($itemnumber);
 566         my $barcode = $item->{barcode};
 567         my $itemcallnumber = $item->{itemcallnumber};
 568
 569         my $borrower = GetMember('borrowernumber'=>$borrowernumber);
 570         my $cardnumber = $borrower->{'cardnumber'};
 571         my $surname = $borrower->{'surname'};
 572         my $firstname = $borrower->{'firstname'};
 573         my $phone = $borrower->{'phone'};
 574
 575         my $bib = GetBiblioData($biblionumber);
 576         my $title = $bib->{title};
 577
 578         $sth_load->execute($biblionumber, $itemnumber, $barcode, $surname, $firstname, $phone, $borrowernumber,
 579                            $cardnumber, $reservedate, $title, $itemcallnumber,
 580                            $holdingbranch, $pickbranch, $reservenotes, $item_level);
 581     }
 582 }
 583
 584 =head2 AddToHoldTargetMap
 585
 586 =cut
 587
 588 sub AddToHoldTargetMap {
 589     my $item_map = shift;
 590
 591     my $dbh = C4::Context->dbh;
 592
 593     my $insert_sql = q(
 594         INSERT INTO hold_fill_targets (borrowernumber, biblionumber, itemnumber, source_branchcode, item_level_request)
 595                                VALUES (?, ?, ?, ?, ?)
 596     );
 597     my $sth_insert = $dbh->prepare($insert_sql);
 598
 599     foreach my $itemnumber (keys %$item_map) {
 600         my $mapped_item = $item_map->{$itemnumber};
 601         $sth_insert->execute($mapped_item->{borrowernumber}, $mapped_item->{biblionumber}, $itemnumber,
 602                              $mapped_item->{holdingbranch}, $mapped_item->{item_level});
 603     }
 604 }
 605
 606 # Helper functions, not part of any interface
 607
 608 sub _trim {
 609     return $_[0] unless $_[0];
 610     $_[0] =~ s/^\s+//;
 611     $_[0] =~ s/\s+$//;
 612     $_[0];
 613 }
 614
 615 sub load_branches_to_pull_from {
 616     my @branches_to_use;
 617
 618     my $static_branch_list = C4::Context->preference("StaticHoldsQueueWeight");
 619     @branches_to_use = map { _trim($_) } split( /,/, $static_branch_list )
 620       if $static_branch_list;
 621
 622     @branches_to_use =
 623       Koha::Database->new()->schema()->resultset('Branch')
 624       ->get_column('branchcode')->all()
 625       unless (@branches_to_use);
 626
 627     @branches_to_use = shuffle(@branches_to_use)
 628       if C4::Context->preference("RandomizeHoldsQueueWeight");
 629
 630     my $today = dt_from_string();
 631     if ( C4::Context->preference('HoldsQueueSkipClosed') ) {
 632         @branches_to_use = grep {
 633             !Koha::Calendar->new( branchcode => $_ )
 634               ->is_holiday( $today )
 635         } @branches_to_use;
 636     }
 637
 638     return \@branches_to_use;
 639 }
 640
 641 sub least_cost_branch {
 642
 643     #$from - arrayref
 644     my ($to, $from, $transport_cost_matrix) = @_;
 645
 646     # Nothing really spectacular: supply to branch, a list of potential from branches
 647     # and find the minimum from - to value from the transport_cost_matrix
 648     return $from->[0] if ( @$from == 1 && $transport_cost_matrix->{$to}{$from->[0]}->{disable_transfer} != 1 );
 649
 650     # If the pickup library is in the list of libraries to pull from,
 651     # return that library right away, it is obviously the least costly
 652     return ($to) if any { $_ eq $to } @$from;
 653
 654     my ($least_cost, @branch);
 655     foreach (@$from) {
 656         my $cell = $transport_cost_matrix->{$to}{$_};
 657         next if $cell->{disable_transfer};
 658
 659         my $cost = $cell->{cost};
 660         next unless defined $cost; # XXX should this be reported?
 661
 662         unless (defined $least_cost) {
 663             $least_cost = $cost;
 664             push @branch, $_;
 665             next;
 666         }
 667
 668         next if $cost > $least_cost;
 669
 670         if ($cost == $least_cost) {
 671             push @branch, $_;
 672             next;
 673         }
 674
 675         @branch = ($_);
 676         $least_cost = $cost;
 677     }
 678
 679     return $branch[0];
 680
 681     # XXX return a random @branch with minimum cost instead of the first one;
 682     # return $branch[0] if @branch == 1;
 683 }
 684
 685
 686 1;