Koha/Calendar.pm

   1 package Koha::Calendar;
   2 use strict;
   3 use warnings;
   4 use 5.010;
   5
   6 use DateTime;
   7 use DateTime::Set;
   8 use DateTime::Duration;
   9 use C4::Context;
  10 use Koha::Caches;
  11 use Carp;
  12
  13 sub new {
  14     my ( $classname, %options ) = @_;
  15     my $self = {};
  16     bless $self, $classname;
  17     for my $o_name ( keys %options ) {
  18         my $o = lc $o_name;
  19         $self->{$o} = $options{$o_name};
  20     }
  21     if ( !defined $self->{branchcode} ) {
  22         croak 'No branchcode argument passed to Koha::Calendar->new';
  23     }
  24     $self->_init();
  25     return $self;
  26 }
  27
  28 sub _init {
  29     my $self       = shift;
  30     my $branch     = $self->{branchcode};
  31     my $dbh        = C4::Context->dbh();
  32     my $weekly_closed_days_sth = $dbh->prepare(
  33 'SELECT weekday FROM repeatable_holidays WHERE branchcode = ? AND weekday IS NOT NULL'
  34     );
  35     $weekly_closed_days_sth->execute( $branch );
  36     $self->{weekly_closed_days} = [ 0, 0, 0, 0, 0, 0, 0 ];
  37     while ( my $tuple = $weekly_closed_days_sth->fetchrow_hashref ) {
  38         $self->{weekly_closed_days}->[ $tuple->{weekday} ] = 1;
  39     }
  40     my $day_month_closed_days_sth = $dbh->prepare(
  41 'SELECT day, month FROM repeatable_holidays WHERE branchcode = ? AND weekday IS NULL'
  42     );
  43     $day_month_closed_days_sth->execute( $branch );
  44     $self->{day_month_closed_days} = {};
  45     while ( my $tuple = $day_month_closed_days_sth->fetchrow_hashref ) {
  46         $self->{day_month_closed_days}->{ $tuple->{month} }->{ $tuple->{day} } =
  47           1;
  48     }
  49
  50     $self->{days_mode}       = C4::Context->preference('useDaysMode');
  51     $self->{test}            = 0;
  52     return;
  53 }
  54
  55 sub exception_holidays {
  56     my ( $self ) = @_;
  57
  58     my $cache  = Koha::Caches->get_instance();
  59     my $cached = $cache->get_from_cache('exception_holidays');
  60     return $cached if $cached;
  61
  62     my $dbh = C4::Context->dbh;
  63     my $branch = $self->{branchcode};
  64     my $exception_holidays_sth = $dbh->prepare(
  65 'SELECT day, month, year FROM special_holidays WHERE branchcode = ? AND isexception = 1'
  66     );
  67     $exception_holidays_sth->execute( $branch );
  68     my $dates = [];
  69     while ( my ( $day, $month, $year ) = $exception_holidays_sth->fetchrow ) {
  70         push @{$dates},
  71           DateTime->new(
  72             day       => $day,
  73             month     => $month,
  74             year      => $year,
  75             time_zone => "floating",
  76           )->truncate( to => 'day' );
  77     }
  78     $self->{exception_holidays} =
  79       DateTime::Set->from_datetimes( dates => $dates );
  80     $cache->set_in_cache( 'exception_holidays', $self->{exception_holidays} );
  81     return $self->{exception_holidays};
  82 }
  83
  84 sub single_holidays {
  85     my ( $self, $date ) = @_;
  86     my $branchcode = $self->{branchcode};
  87     my $cache           = Koha::Caches->get_instance();
  88     my $single_holidays = $cache->get_from_cache('single_holidays');
  89
  90     # $single_holidays looks like:
  91     # {
  92     #   CPL =>  [
  93     #        [0] 20131122,
  94     #         ...
  95     #    ],
  96     #   ...
  97     # }
  98
  99     unless ($single_holidays) {
 100         my $dbh = C4::Context->dbh;
 101         $single_holidays = {};
 102
 103         # push holidays for each branch
 104         my $branches_sth =
 105           $dbh->prepare('SELECT distinct(branchcode) FROM special_holidays');
 106         $branches_sth->execute();
 107         while ( my $br = $branches_sth->fetchrow ) {
 108             my $single_holidays_sth = $dbh->prepare(
 109 'SELECT day, month, year FROM special_holidays WHERE branchcode = ? AND isexception = 0'
 110             );
 111             $single_holidays_sth->execute($br);
 112
 113             my @ymd_arr;
 114             while ( my ( $day, $month, $year ) =
 115                 $single_holidays_sth->fetchrow )
 116             {
 117                 my $dt = DateTime->new(
 118                     day       => $day,
 119                     month     => $month,
 120                     year      => $year,
 121                     time_zone => 'floating',
 122                 )->truncate( to => 'day' );
 123                 push @ymd_arr, $dt->ymd('');
 124             }
 125             $single_holidays->{$br} = \@ymd_arr;
 126         }    # br
 127         $cache->set_in_cache( 'single_holidays', $single_holidays,
 128             { expiry => 76800 } )    #24 hrs ;
 129     }
 130     my $holidays  = ( $single_holidays->{$branchcode} );
 131     for my $hols  (@$holidays ) {
 132             return 1 if ( $date == $hols )   #match ymds;
 133     }
 134     return 0;
 135 }
 136
 137 sub addDate {
 138     my ( $self, $startdate, $add_duration, $unit ) = @_;
 139
 140     # Default to days duration (legacy support I guess)
 141     if ( ref $add_duration ne 'DateTime::Duration' ) {
 142         $add_duration = DateTime::Duration->new( days => $add_duration );
 143     }
 144
 145     $unit ||= 'days'; # default days ?
 146     my $dt;
 147
 148     if ( $unit eq 'hours' ) {
 149         # Fixed for legacy support. Should be set as a branch parameter
 150         my $return_by_hour = 10;
 151
 152         $dt = $self->addHours($startdate, $add_duration, $return_by_hour);
 153     } else {
 154         # days
 155         $dt = $self->addDays($startdate, $add_duration);
 156     }
 157
 158     return $dt;
 159 }
 160
 161 sub addHours {
 162     my ( $self, $startdate, $hours_duration, $return_by_hour ) = @_;
 163     my $base_date = $startdate->clone();
 164
 165     $base_date->add_duration($hours_duration);
 166
 167     # If we are using the calendar behave for now as if Datedue
 168     # was the chosen option (current intended behaviour)
 169
 170     if ( $self->{days_mode} ne 'Days' &&
 171           $self->is_holiday($base_date) ) {
 172
 173         if ( $hours_duration->is_negative() ) {
 174             $base_date = $self->prev_open_day($base_date);
 175         } else {
 176             $base_date = $self->next_open_day($base_date);
 177         }
 178
 179         $base_date->set_hour($return_by_hour);
 180
 181     }
 182
 183     return $base_date;
 184 }
 185
 186 sub addDays {
 187     my ( $self, $startdate, $days_duration ) = @_;
 188     my $base_date = $startdate->clone();
 189
 190     $self->{days_mode} ||= q{};
 191
 192     if ( $self->{days_mode} eq 'Calendar' ) {
 193         # use the calendar to skip all days the library is closed
 194         # when adding
 195         my $days = abs $days_duration->in_units('days');
 196
 197         if ( $days_duration->is_negative() ) {
 198             while ($days) {
 199                 $base_date = $self->prev_open_day($base_date);
 200                 --$days;
 201             }
 202         } else {
 203             while ($days) {
 204                 $base_date = $self->next_open_day($base_date);
 205                 --$days;
 206             }
 207         }
 208
 209     } else { # Days or Datedue
 210         # use straight days, then use calendar to push
 211         # the date to the next open day if Datedue
 212         $base_date->add_duration($days_duration);
 213
 214         if ( $self->{days_mode} eq 'Datedue' ) {
 215             # Datedue, then use the calendar to push
 216             # the date to the next open day if holiday
 217             if ( $self->is_holiday($base_date) ) {
 218
 219                 if ( $days_duration->is_negative() ) {
 220                     $base_date = $self->prev_open_day($base_date);
 221                 } else {
 222                     $base_date = $self->next_open_day($base_date);
 223                 }
 224             }
 225         }
 226     }
 227
 228     return $base_date;
 229 }
 230
 231 sub is_holiday {
 232     my ( $self, $dt ) = @_;
 233
 234     my $localdt = $dt->clone();
 235     my $day   = $localdt->day;
 236     my $month = $localdt->month;
 237
 238     #Change timezone to "floating" before doing any calculations or comparisons
 239     $localdt->set_time_zone("floating");
 240     $localdt->truncate( to => 'day' );
 241
 242
 243     if ( $self->exception_holidays->contains($localdt) ) {
 244         # exceptions are not holidays
 245         return 0;
 246     }
 247
 248     my $dow = $localdt->day_of_week;
 249     # Representation fix
 250     # DateTime object dow (1-7) where Monday is 1
 251     # Arrays are 0-based where 0 = Sunday, not 7.
 252     if ( $dow == 7 ) {
 253         $dow = 0;
 254     }
 255
 256     if ( $self->{weekly_closed_days}->[$dow] == 1 ) {
 257         return 1;
 258     }
 259
 260     if ( exists $self->{day_month_closed_days}->{$month}->{$day} ) {
 261         return 1;
 262     }
 263
 264     my $ymd   = $localdt->ymd('')  ;
 265     if ($self->single_holidays(  $ymd  ) == 1 ) {
 266         return 1;
 267     }
 268
 269     # damn have to go to work after all
 270     return 0;
 271 }
 272
 273 sub next_open_day {
 274     my ( $self, $dt ) = @_;
 275     my $base_date = $dt->clone();
 276
 277     $base_date->add(days => 1);
 278
 279     while ($self->is_holiday($base_date)) {
 280         $base_date->add(days => 1);
 281     }
 282
 283     return $base_date;
 284 }
 285
 286 sub prev_open_day {
 287     my ( $self, $dt ) = @_;
 288     my $base_date = $dt->clone();
 289
 290     $base_date->add(days => -1);
 291
 292     while ($self->is_holiday($base_date)) {
 293         $base_date->add(days => -1);
 294     }
 295
 296     return $base_date;
 297 }
 298
 299 sub days_forward {
 300     my $self     = shift;
 301     my $start_dt = shift;
 302     my $num_days = shift;
 303
 304     return $start_dt unless $num_days > 0;
 305
 306     my $base_dt = $start_dt->clone();
 307
 308     while ($num_days--) {
 309         $base_dt = $self->next_open_day($base_dt);
 310     }
 311
 312     return $base_dt;
 313 }
 314
 315 sub days_between {
 316     my $self     = shift;
 317     my $start_dt = shift;
 318     my $end_dt   = shift;
 319
 320     if ( $start_dt->compare($end_dt) > 0 ) {
 321         # swap dates
 322         my $int_dt = $end_dt;
 323         $end_dt = $start_dt;
 324         $start_dt = $int_dt;
 325     }
 326
 327
 328     # start and end should not be closed days
 329     my $days = $start_dt->delta_days($end_dt)->delta_days;
 330     for (my $dt = $start_dt->clone();
 331         $dt <= $end_dt;
 332         $dt->add(days => 1)
 333     ) {
 334         if ($self->is_holiday($dt)) {
 335             $days--;
 336         }
 337     }
 338     return DateTime::Duration->new( days => $days );
 339
 340 }
 341
 342 sub hours_between {
 343     my ($self, $start_date, $end_date) = @_;
 344     my $start_dt = $start_date->clone();
 345     my $end_dt = $end_date->clone();
 346     my $duration = $end_dt->delta_ms($start_dt);
 347     $start_dt->truncate( to => 'day' );
 348     $end_dt->truncate( to => 'day' );
 349     # NB this is a kludge in that it assumes all days are 24 hours
 350     # However for hourly loans the logic should be expanded to
 351     # take into account open/close times then it would be a duration
 352     # of library open hours
 353     my $skipped_days = 0;
 354     for (my $dt = $start_dt->clone();
 355         $dt <= $end_dt;
 356         $dt->add(days => 1)
 357     ) {
 358         if ($self->is_holiday($dt)) {
 359             ++$skipped_days;
 360         }
 361     }
 362     if ($skipped_days) {
 363         $duration->subtract_duration(DateTime::Duration->new( hours => 24 * $skipped_days));
 364     }
 365
 366     return $duration;
 367
 368 }
 369
 370 sub set_daysmode {
 371     my ( $self, $mode ) = @_;
 372
 373     # if not testing this is a no op
 374     if ( $self->{test} ) {
 375         $self->{days_mode} = $mode;
 376     }
 377
 378     return;
 379 }
 380
 381 sub clear_weekly_closed_days {
 382     my $self = shift;
 383     $self->{weekly_closed_days} = [ 0, 0, 0, 0, 0, 0, 0 ];    # Sunday only
 384     return;
 385 }
 386
 387 1;
 388 __END__
 389
 390 =head1 NAME
 391
 392 Koha::Calendar - Object containing a branches calendar
 393
 394 =head1 SYNOPSIS
 395
 396   use Koha::Calendar
 397
 398   my $c = Koha::Calendar->new( branchcode => 'MAIN' );
 399   my $dt = DateTime->now();
 400
 401   # are we open
 402   $open = $c->is_holiday($dt);
 403   # when will item be due if loan period = $dur (a DateTime::Duration object)
 404   $duedate = $c->addDate($dt,$dur,'days');
 405
 406
 407 =head1 DESCRIPTION
 408
 409   Implements those features of C4::Calendar needed for Staffs Rolling Loans
 410
 411 =head1 METHODS
 412
 413 =head2 new : Create a calendar object
 414
 415 my $calendar = Koha::Calendar->new( branchcode => 'MAIN' );
 416
 417 The option branchcode is required
 418
 419
 420 =head2 addDate
 421
 422     my $dt = $calendar->addDate($date, $dur, $unit)
 423
 424 C<$date> is a DateTime object representing the starting date of the interval.
 425
 426 C<$offset> is a DateTime::Duration to add to it
 427
 428 C<$unit> is a string value 'days' or 'hours' toflag granularity of duration
 429
 430 Currently unit is only used to invoke Staffs return Monday at 10 am rule this
 431 parameter will be removed when issuingrules properly cope with that
 432
 433
 434 =head2 addHours
 435
 436     my $dt = $calendar->addHours($date, $dur, $return_by_hour )
 437
 438 C<$date> is a DateTime object representing the starting date of the interval.
 439
 440 C<$offset> is a DateTime::Duration to add to it
 441
 442 C<$return_by_hour> is an integer value representing the opening hour for the branch
 443
 444
 445 =head2 addDays
 446
 447     my $dt = $calendar->addDays($date, $dur)
 448
 449 C<$date> is a DateTime object representing the starting date of the interval.
 450
 451 C<$offset> is a DateTime::Duration to add to it
 452
 453 C<$unit> is a string value 'days' or 'hours' toflag granularity of duration
 454
 455 Currently unit is only used to invoke Staffs return Monday at 10 am rule this
 456 parameter will be removed when issuingrules properly cope with that
 457
 458
 459 =head2 single_holidays
 460
 461 my $rc = $self->single_holidays(  $ymd  );
 462
 463 Passed a $date in Ymd (yyyymmdd) format -  returns 1 if date is a single_holiday, or 0 if not.
 464
 465
 466 =head2 is_holiday
 467
 468 $yesno = $calendar->is_holiday($dt);
 469
 470 passed a DateTime object returns 1 if it is a closed day
 471 0 if not according to the calendar
 472
 473 =head2 days_between
 474
 475 $duration = $calendar->days_between($start_dt, $end_dt);
 476
 477 Passed two dates returns a DateTime::Duration object measuring the length between them
 478 ignoring closed days. Always returns a positive number irrespective of the
 479 relative order of the parameters
 480
 481 =head2 next_open_day
 482
 483 $datetime = $calendar->next_open_day($duedate_dt)
 484
 485 Passed a Datetime returns another Datetime representing the next open day. It is
 486 intended for use to calculate the due date when useDaysMode syspref is set to either
 487 'Datedue' or 'Calendar'.
 488
 489 =head2 prev_open_day
 490
 491 $datetime = $calendar->prev_open_day($duedate_dt)
 492
 493 Passed a Datetime returns another Datetime representing the previous open day. It is
 494 intended for use to calculate the due date when useDaysMode syspref is set to either
 495 'Datedue' or 'Calendar'.
 496
 497 =head2 set_daysmode
 498
 499 For testing only allows the calling script to change days mode
 500
 501 =head2 clear_weekly_closed_days
 502
 503 In test mode changes the testing set of closed days to a new set with
 504 no closed days. TODO passing an array of closed days to this would
 505 allow testing of more configurations
 506
 507 =head2 add_holiday
 508
 509 Passed a datetime object this will add it to the calendar's list of
 510 closed days. This is for testing so that we can alter the Calenfar object's
 511 list of specified dates
 512
 513 =head1 DIAGNOSTICS
 514
 515 Will croak if not passed a branchcode in new
 516
 517 =head1 BUGS AND LIMITATIONS
 518
 519 This only contains a limited subset of the functionality in C4::Calendar
 520 Only enough to support Staffs Rolling loans
 521
 522 =head1 AUTHOR
 523
 524 Colin Campbell colin.campbell@ptfs-europe.com
 525
 526 =head1 LICENSE AND COPYRIGHT
 527
 528 Copyright (c) 2011 PTFS-Europe Ltd All rights reserved
 529
 530 This program is free software: you can redistribute it and/or modify
 531 it under the terms of the GNU General Public License as published by
 532 the Free Software Foundation, either version 2 of the License, or
 533 (at your option) any later version.
 534
 535 This program is distributed in the hope that it will be useful,
 536 but WITHOUT ANY WARRANTY; without even the implied warranty of
 537 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 538 GNU General Public License for more details.
 539
 540 You should have received a copy of the GNU General Public License
 541 along with this program.  If not, see <http://www.gnu.org/licenses/>.