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     if ( $unit eq 'hours' ) {
 148         # Fixed for legacy support. Should be set as a branch parameter
 149         my $return_by_hour = 10;
 150
 151         $dt = $self->addHours($startdate, $add_duration, $return_by_hour);
 152     } else {
 153         # days
 154         $dt = $self->addDays($startdate, $add_duration);
 155     }
 156     return $dt;
 157 }
 158
 159 sub addHours {
 160     my ( $self, $startdate, $hours_duration, $return_by_hour ) = @_;
 161     my $base_date = $startdate->clone();
 162
 163     $base_date->add_duration($hours_duration);
 164
 165     # If we are using the calendar behave for now as if Datedue
 166     # was the chosen option (current intended behaviour)
 167
 168     if ( $self->{days_mode} ne 'Days' &&
 169           $self->is_holiday($base_date) ) {
 170
 171         if ( $hours_duration->is_negative() ) {
 172             $base_date = $self->prev_open_days($base_date, 1);
 173         } else {
 174             $base_date = $self->next_open_days($base_date, 1);
 175         }
 176
 177         $base_date->set_hour($return_by_hour);
 178
 179     }
 180
 181     return $base_date;
 182 }
 183
 184 sub addDays {
 185     my ( $self, $startdate, $days_duration ) = @_;
 186     my $base_date = $startdate->clone();
 187
 188     $self->{days_mode} ||= q{};
 189
 190     if ( $self->{days_mode} eq 'Calendar' ) {
 191         # use the calendar to skip all days the library is closed
 192         # when adding
 193         my $days = abs $days_duration->in_units('days');
 194
 195         if ( $days_duration->is_negative() ) {
 196             while ($days) {
 197                 $base_date = $self->prev_open_days($base_date, 1);
 198                 --$days;
 199             }
 200         } else {
 201             while ($days) {
 202                 $base_date = $self->next_open_days($base_date, 1);
 203                 --$days;
 204             }
 205         }
 206
 207     } else { # Days, Datedue or Dayweek
 208         # use straight days, then use calendar to push
 209         # the date to the next open day as appropriate
 210         # if Datedue or Dayweek
 211         $base_date->add_duration($days_duration);
 212
 213         if ( $self->{days_mode} eq 'Datedue' ||
 214             $self->{days_mode} eq 'Dayweek') {
 215             # Datedue or Dayweek, then use the calendar to push
 216             # the date to the next open day if holiday
 217             if ( $self->is_holiday($base_date) ) {
 218                 my $dow = $base_date->day_of_week;
 219                 my $days = $days_duration->in_units('days');
 220                 # Is it a period based on weeks
 221                 my $push_amt = $days % 7 == 0 ?
 222                     $self->get_push_amt($base_date) : 1;
 223                 if ( $days_duration->is_negative() ) {
 224                     $base_date = $self->prev_open_days($base_date, $push_amt);
 225                 } else {
 226                     $base_date = $self->next_open_days($base_date, $push_amt);
 227                 }
 228             }
 229         }
 230     }
 231
 232     return $base_date;
 233 }
 234
 235 sub get_push_amt {
 236     my ( $self, $base_date) = @_;
 237
 238     my $dow = $base_date->day_of_week;
 239     return (
 240         # We're using Dayweek useDaysMode option
 241         $self->{days_mode} eq 'Dayweek' &&
 242         # It's not a permanently closed day
 243         !$self->{weekly_closed_days}->[$dow] == 1
 244     ) ? 7 : 1;
 245 }
 246
 247 sub is_holiday {
 248     my ( $self, $dt ) = @_;
 249
 250     my $localdt = $dt->clone();
 251     my $day   = $localdt->day;
 252     my $month = $localdt->month;
 253
 254     #Change timezone to "floating" before doing any calculations or comparisons
 255     $localdt->set_time_zone("floating");
 256     $localdt->truncate( to => 'day' );
 257
 258
 259     if ( $self->exception_holidays->contains($localdt) ) {
 260         # exceptions are not holidays
 261         return 0;
 262     }
 263
 264     my $dow = $localdt->day_of_week;
 265     # Representation fix
 266     # DateTime object dow (1-7) where Monday is 1
 267     # Arrays are 0-based where 0 = Sunday, not 7.
 268     if ( $dow == 7 ) {
 269         $dow = 0;
 270     }
 271
 272     if ( $self->{weekly_closed_days}->[$dow] == 1 ) {
 273         return 1;
 274     }
 275
 276     if ( exists $self->{day_month_closed_days}->{$month}->{$day} ) {
 277         return 1;
 278     }
 279
 280     my $ymd   = $localdt->ymd('')  ;
 281     if ($self->single_holidays(  $ymd  ) == 1 ) {
 282         return 1;
 283     }
 284
 285     # damn have to go to work after all
 286     return 0;
 287 }
 288
 289 sub next_open_days {
 290     my ( $self, $dt, $to_add ) = @_;
 291     my $base_date = $dt->clone();
 292
 293     $base_date->add(days => $to_add);
 294     while ($self->is_holiday($base_date)) {
 295         my $add_next = $self->get_push_amt($base_date);
 296         $base_date->add(days => $add_next);
 297     }
 298     return $base_date;
 299 }
 300
 301 sub prev_open_days {
 302     my ( $self, $dt, $to_sub ) = @_;
 303     my $base_date = $dt->clone();
 304
 305     # It feels logical to be passed a positive number, though we're
 306     # subtracting, so do the right thing
 307     $to_sub = $to_sub > 0 ? 0 - $to_sub : $to_sub;
 308
 309     $base_date->add(days => $to_sub);
 310
 311     while ($self->is_holiday($base_date)) {
 312         my $sub_next = $self->get_push_amt($base_date);
 313         # Ensure we're subtracting when we need to be
 314         $sub_next = $sub_next > 0 ? 0 - $sub_next : $sub_next;
 315         $base_date->add(days => $sub_next);
 316     }
 317
 318     return $base_date;
 319 }
 320
 321 sub days_forward {
 322     my $self     = shift;
 323     my $start_dt = shift;
 324     my $num_days = shift;
 325
 326     return $start_dt unless $num_days > 0;
 327
 328     my $base_dt = $start_dt->clone();
 329
 330     while ($num_days--) {
 331         $base_dt = $self->next_open_days($base_dt, 1);
 332     }
 333
 334     return $base_dt;
 335 }
 336
 337 sub days_between {
 338     my $self     = shift;
 339     my $start_dt = shift;
 340     my $end_dt   = shift;
 341
 342     # Change time zone for date math and swap if needed
 343     $start_dt = $start_dt->clone->set_time_zone('floating');
 344     $end_dt = $end_dt->clone->set_time_zone('floating');
 345     if( $start_dt->compare($end_dt) > 0 ) {
 346         ( $start_dt, $end_dt ) = ( $end_dt, $start_dt );
 347     }
 348
 349     # start and end should not be closed days
 350     my $days = $start_dt->delta_days($end_dt)->delta_days;
 351     while( $start_dt->compare($end_dt) < 1 ) {
 352         $days-- if $self->is_holiday($start_dt);
 353         $start_dt->add( days => 1 );
 354     }
 355     return DateTime::Duration->new( days => $days );
 356 }
 357
 358 sub hours_between {
 359     my ($self, $start_date, $end_date) = @_;
 360     my $start_dt = $start_date->clone()->set_time_zone('floating');
 361     my $end_dt = $end_date->clone()->set_time_zone('floating');
 362     my $duration = $end_dt->delta_ms($start_dt);
 363     $start_dt->truncate( to => 'day' );
 364     $end_dt->truncate( to => 'day' );
 365     # NB this is a kludge in that it assumes all days are 24 hours
 366     # However for hourly loans the logic should be expanded to
 367     # take into account open/close times then it would be a duration
 368     # of library open hours
 369     # start and end should not be closed days
 370     my $skipped_days = 0;
 371     while( $start_dt->compare($end_dt) < 1 ) {
 372         $start_dt->add( days => 1 );
 373         $skipped_days++ if $self->is_holiday($start_dt);
 374     }
 375     if ($skipped_days) {
 376         $duration->subtract_duration(DateTime::Duration->new( hours => 24 * $skipped_days));
 377     }
 378
 379     return $duration;
 380 }
 381
 382 sub set_daysmode {
 383     my ( $self, $mode ) = @_;
 384
 385     # if not testing this is a no op
 386     if ( $self->{test} ) {
 387         $self->{days_mode} = $mode;
 388     }
 389
 390     return;
 391 }
 392
 393 sub clear_weekly_closed_days {
 394     my $self = shift;
 395     $self->{weekly_closed_days} = [ 0, 0, 0, 0, 0, 0, 0 ];    # Sunday only
 396     return;
 397 }
 398
 399 1;
 400 __END__
 401
 402 =head1 NAME
 403
 404 Koha::Calendar - Object containing a branches calendar
 405
 406 =head1 SYNOPSIS
 407
 408   use Koha::Calendar
 409
 410   my $c = Koha::Calendar->new( branchcode => 'MAIN' );
 411   my $dt = DateTime->now();
 412
 413   # are we open
 414   $open = $c->is_holiday($dt);
 415   # when will item be due if loan period = $dur (a DateTime::Duration object)
 416   $duedate = $c->addDate($dt,$dur,'days');
 417
 418
 419 =head1 DESCRIPTION
 420
 421   Implements those features of C4::Calendar needed for Staffs Rolling Loans
 422
 423 =head1 METHODS
 424
 425 =head2 new : Create a calendar object
 426
 427 my $calendar = Koha::Calendar->new( branchcode => 'MAIN' );
 428
 429 The option branchcode is required
 430
 431
 432 =head2 addDate
 433
 434     my $dt = $calendar->addDate($date, $dur, $unit)
 435
 436 C<$date> is a DateTime object representing the starting date of the interval.
 437
 438 C<$offset> is a DateTime::Duration to add to it
 439
 440 C<$unit> is a string value 'days' or 'hours' toflag granularity of duration
 441
 442 Currently unit is only used to invoke Staffs return Monday at 10 am rule this
 443 parameter will be removed when issuingrules properly cope with that
 444
 445
 446 =head2 addHours
 447
 448     my $dt = $calendar->addHours($date, $dur, $return_by_hour )
 449
 450 C<$date> is a DateTime object representing the starting date of the interval.
 451
 452 C<$offset> is a DateTime::Duration to add to it
 453
 454 C<$return_by_hour> is an integer value representing the opening hour for the branch
 455
 456
 457 =head2 addDays
 458
 459     my $dt = $calendar->addDays($date, $dur)
 460
 461 C<$date> is a DateTime object representing the starting date of the interval.
 462
 463 C<$offset> is a DateTime::Duration to add to it
 464
 465 C<$unit> is a string value 'days' or 'hours' toflag granularity of duration
 466
 467 Currently unit is only used to invoke Staffs return Monday at 10 am rule this
 468 parameter will be removed when issuingrules properly cope with that
 469
 470
 471 =head2 single_holidays
 472
 473 my $rc = $self->single_holidays(  $ymd  );
 474
 475 Passed a $date in Ymd (yyyymmdd) format -  returns 1 if date is a single_holiday, or 0 if not.
 476
 477
 478 =head2 is_holiday
 479
 480 $yesno = $calendar->is_holiday($dt);
 481
 482 passed a DateTime object returns 1 if it is a closed day
 483 0 if not according to the calendar
 484
 485 =head2 days_between
 486
 487 $duration = $calendar->days_between($start_dt, $end_dt);
 488
 489 Passed two dates returns a DateTime::Duration object measuring the length between them
 490 ignoring closed days. Always returns a positive number irrespective of the
 491 relative order of the parameters
 492
 493 =head2 next_open_days
 494
 495 $datetime = $calendar->next_open_days($duedate_dt, $to_add)
 496
 497 Passed a Datetime and number of days,  returns another Datetime representing
 498 the next open day after adding the passed number of days. It is intended for
 499 use to calculate the due date when useDaysMode syspref is set to either
 500 'Datedue', 'Calendar' or 'Dayweek'.
 501
 502 =head2 prev_open_days
 503
 504 $datetime = $calendar->prev_open_days($duedate_dt, $to_sub)
 505
 506 Passed a Datetime and a number of days, returns another Datetime
 507 representing the previous open day after subtracting the number of passed
 508 days. It is intended for use to calculate the due date when useDaysMode
 509 syspref is set to either 'Datedue', 'Calendar' or 'Dayweek'.
 510
 511 =head2 set_daysmode
 512
 513 For testing only allows the calling script to change days mode
 514
 515 =head2 clear_weekly_closed_days
 516
 517 In test mode changes the testing set of closed days to a new set with
 518 no closed days. TODO passing an array of closed days to this would
 519 allow testing of more configurations
 520
 521 =head2 add_holiday
 522
 523 Passed a datetime object this will add it to the calendar's list of
 524 closed days. This is for testing so that we can alter the Calenfar object's
 525 list of specified dates
 526
 527 =head1 DIAGNOSTICS
 528
 529 Will croak if not passed a branchcode in new
 530
 531 =head1 BUGS AND LIMITATIONS
 532
 533 This only contains a limited subset of the functionality in C4::Calendar
 534 Only enough to support Staffs Rolling loans
 535
 536 =head1 AUTHOR
 537
 538 Colin Campbell colin.campbell@ptfs-europe.com
 539
 540 =head1 LICENSE AND COPYRIGHT
 541
 542 Copyright (c) 2011 PTFS-Europe Ltd All rights reserved
 543
 544 This program is free software: you can redistribute it and/or modify
 545 it under the terms of the GNU General Public License as published by
 546 the Free Software Foundation, either version 2 of the License, or
 547 (at your option) any later version.
 548
 549 This program is distributed in the hope that it will be useful,
 550 but WITHOUT ANY WARRANTY; without even the implied warranty of
 551 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 552 GNU General Public License for more details.
 553
 554 You should have received a copy of the GNU General Public License
 555 along with this program.  If not, see <http://www.gnu.org/licenses/>.