package C4::RotatingCollections;

# $Id: RotatingCollections.pm,v 0.1 2007/04/20 kylemhall

# This package is inteded to keep track of what library
# Items of a certain collection should be at.

# Copyright 2007 Kyle Hall
#
# This file is part of Koha.
#
# Koha is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# Koha is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Koha; if not, see <http://www.gnu.org/licenses>.

use Modern::Perl;

use C4::Context;
use C4::Circulation;
use C4::Reserves qw(CheckReserves);
use Koha::Database;

use DBI;

use Data::Dumper;

use vars qw(@ISA @EXPORT);


=head1 NAME

C4::RotatingCollections - Functions for managing rotating collections

=head1 FUNCTIONS

=cut

BEGIN {
    require Exporter;
    @ISA    = qw( Exporter );
    @EXPORT = qw(
      CreateCollection
      UpdateCollection
      DeleteCollection

      GetItemsInCollection

      GetCollection
      GetCollections

      AddItemToCollection
      RemoveItemFromCollection
      TransferCollection

      GetCollectionItemBranches
    );
}

=head2  CreateCollection
 ( $success, $errorcode, $errormessage ) = CreateCollection( $title, $description );
 Creates a new collection

 Input:
   $title: short description of the club or service
   $description: long description of the club or service

 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub CreateCollection {
    my ( $title, $description ) = @_;

    my $schema = Koha::Database->new()->schema();
    my $duplicate_titles = $schema->resultset('Collection')->count({ colTitle => $title });

    ## Check for all necessary parameters
    if ( !$title ) {
        return ( 0, 1, "NO_TITLE" );
    } elsif ( $duplicate_titles ) {
        return ( 0, 2, "DUPLICATE_TITLE" );
    }

    $description ||= q{};

    my $success = 1;

    my $dbh = C4::Context->dbh;

    my $sth;
    $sth = $dbh->prepare(
        "INSERT INTO collections ( colId, colTitle, colDesc )
                        VALUES ( NULL, ?, ? )"
    );
    $sth->execute( $title, $description ) or return ( 0, 3, $sth->errstr() );

    return 1;

}

=head2 UpdateCollection

 ( $success, $errorcode, $errormessage ) = UpdateCollection( $colId, $title, $description );

Updates a collection

 Input:
   $colId: id of the collection to be updated
   $title: short description of the club or service
   $description: long description of the club or service

 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub UpdateCollection {
    my ( $colId, $title, $description ) = @_;

    my $schema = Koha::Database->new()->schema();
    my $duplicate_titles = $schema->resultset('Collection')->count({ colTitle => $title,  -not => { colId => $colId } });

    ## Check for all necessary parameters
    if ( !$colId ) {
        return ( 0, 1, "NO_ID" );
    }
    if ( !$title ) {
        return ( 0, 2, "NO_TITLE" );
    }
    if ( $duplicate_titles ) {
        return ( 0, 3, "DUPLICATE_TITLE" );
    }

    my $dbh = C4::Context->dbh;

    $description ||= q{};

    my $sth;
    $sth = $dbh->prepare(
        "UPDATE collections
                        SET 
                        colTitle = ?, colDesc = ? 
                        WHERE colId = ?"
    );
    $sth->execute( $title, $description, $colId )
      or return ( 0, 4, $sth->errstr() );

    return 1;

}

=head2 DeleteCollection

 ( $success, $errorcode, $errormessage ) = DeleteCollection( $colId );
 Deletes a collection of the given id

 Input:
   $colId : id of the Archetype to be deleted

 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub DeleteCollection {
    my ($colId) = @_;

    ## Parameter check
    if ( !$colId ) {
        return ( 0, 1, "NO_ID" );
    }

    my $dbh = C4::Context->dbh;

    my $sth;

    $sth = $dbh->prepare("DELETE FROM collections WHERE colId = ?");
    $sth->execute($colId) or return ( 0, 4, $sth->errstr() );

    return 1;
}

=head2 GetCollections

 $collections = GetCollections();
 Returns data about all collections

 Output:
  On Success:
   $results: Reference to an array of associated arrays
  On Failure:
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub GetCollections {

    my $dbh = C4::Context->dbh;

    my $sth = $dbh->prepare("SELECT * FROM collections");
    $sth->execute() or return ( 1, $sth->errstr() );

    my @results;
    while ( my $row = $sth->fetchrow_hashref ) {
        push( @results, $row );
    }

    return \@results;
}

=head2 GetItemsInCollection

 ( $results, $success, $errorcode, $errormessage ) = GetItemsInCollection( $colId );

 Returns information about the items in the given collection
 
 Input:
   $colId: The id of the collection

 Output:
   $results: Reference to an array of associated arrays
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub GetItemsInCollection {
    my ($colId) = @_;

    ## Parameter check
    if ( !$colId ) {
        return ( 0, 0, 1, "NO_ID" );
    }

    my $dbh = C4::Context->dbh;

    my $sth = $dbh->prepare(
        "SELECT
                             biblio.title,
                             biblio.biblionumber,
                             items.itemcallnumber,
                             items.barcode
                           FROM collections, collections_tracking, items, biblio
                           WHERE collections.colId = collections_tracking.colId
                           AND collections_tracking.itemnumber = items.itemnumber
                           AND items.biblionumber = biblio.biblionumber
                           AND collections.colId = ? ORDER BY biblio.title"
    );
    $sth->execute($colId) or return ( 0, 0, 2, $sth->errstr() );

    my @results;
    while ( my $row = $sth->fetchrow_hashref ) {
        push( @results, $row );
    }

    return \@results;
}

=head2 GetCollection

 ( $colId, $colTitle, $colDesc, $colBranchcode ) = GetCollection( $colId );

Returns information about a collection

 Input:
   $colId: Id of the collection
 Output:
   $colId, $colTitle, $colDesc, $colBranchcode

=cut

sub GetCollection {
    my ($colId) = @_;

    my $dbh = C4::Context->dbh;

    my ( $sth, @results );
    $sth = $dbh->prepare("SELECT * FROM collections WHERE colId = ?");
    $sth->execute($colId) or return 0;

    my $row = $sth->fetchrow_hashref;

    return (
        $$row{'colId'},   $$row{'colTitle'},
        $$row{'colDesc'}, $$row{'colBranchcode'}
    );

}

=head2 AddItemToCollection

 ( $success, $errorcode, $errormessage ) = AddItemToCollection( $colId, $itemnumber );

Adds an item to a rotating collection.

 Input:
   $colId: Collection to add the item to.
   $itemnumber: Item to be added to the collection
 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub AddItemToCollection {
    my ( $colId, $itemnumber ) = @_;

    ## Check for all necessary parameters
    if ( !$colId ) {
        return ( 0, 1, "NO_ID" );
    }
    if ( !$itemnumber ) {
        return ( 0, 2, "NO_ITEM" );
    }

    if ( isItemInThisCollection( $itemnumber, $colId ) ) {
        return ( 0, 2, "IN_COLLECTION" );
    }
    elsif ( isItemInAnyCollection($itemnumber) ) {
        return ( 0, 3, "IN_COLLECTION_OTHER" );
    }

    my $dbh = C4::Context->dbh;

    my $sth;
    $sth = $dbh->prepare("
        INSERT INTO collections_tracking (
            colId,
            itemnumber
        ) VALUES ( ?, ? )
    ");
    $sth->execute( $colId, $itemnumber ) or return ( 0, 3, $sth->errstr() );

    return 1;

}

=head2  RemoveItemFromCollection

 ( $success, $errorcode, $errormessage ) = RemoveItemFromCollection( $colId, $itemnumber );

Removes an item to a collection

 Input:
   $colId: Collection to add the item to.
   $itemnumber: Item to be removed from collection

 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub RemoveItemFromCollection {
    my ( $colId, $itemnumber ) = @_;

    ## Check for all necessary parameters
    if ( !$itemnumber ) {
        return ( 0, 2, "NO_ITEM" );
    }

    if ( !isItemInThisCollection( $itemnumber, $colId ) ) {
        return ( 0, 2, "NOT_IN_COLLECTION" );
    }

    my $dbh = C4::Context->dbh;

    my $sth;
    $sth = $dbh->prepare(
        "DELETE FROM collections_tracking
                        WHERE itemnumber = ?"
    );
    $sth->execute($itemnumber) or return ( 0, 3, $sth->errstr() );

    return 1;
}

=head2 TransferCollection

 ( $success, $errorcode, $errormessage ) = TransferCollection( $colId, $colBranchcode );

Transfers a collection to another branch

 Input:
   $colId: id of the collection to be updated
   $colBranchcode: branch where collection is moving to

 Output:
   $success: 1 if all database operations were successful, 0 otherwise
   $errorCode: Code for reason of failure, good for translating errors in templates
   $errorMessage: English description of error

=cut

sub TransferCollection {
    my ( $colId, $colBranchcode ) = @_;

    ## Check for all necessary parameters
    if ( !$colId ) {
        return ( 0, 1, "NO_ID" );
    }
    if ( !$colBranchcode ) {
        return ( 0, 2, "NO_BRANCHCODE" );
    }

    my $dbh = C4::Context->dbh;

    my $sth;
    $sth = $dbh->prepare(
        "UPDATE collections
                        SET 
                        colBranchcode = ? 
                        WHERE colId = ?"
    );
    $sth->execute( $colBranchcode, $colId ) or return ( 0, 4, $sth->errstr() );

    $sth = $dbh->prepare(q{
        SELECT items.itemnumber, items.barcode FROM collections_tracking
        LEFT JOIN items ON collections_tracking.itemnumber = items.itemnumber
        LEFT JOIN issues ON items.itemnumber = issues.itemnumber
        WHERE issues.borrowernumber IS NULL
          AND collections_tracking.colId = ?
    });
    $sth->execute($colId) or return ( 0, 4, $sth->errstr );
    my @results;
    while ( my $item = $sth->fetchrow_hashref ) {
        my ($status) = CheckReserves( $item->{itemnumber} );
        my @transfers = C4::Circulation::GetTransfers( $item->{itemnumber} );
        C4::Circulation::transferbook( $colBranchcode, $item->{barcode}, 1, 'RotatingCollection' ) unless ( $status eq 'Waiting' || @transfers );
    }

    return 1;
}

=head2 GetCollectionItemBranches

  my ( $holdingBranch, $collectionBranch ) = GetCollectionItemBranches( $itemnumber );

=cut

sub GetCollectionItemBranches {
    my ($itemnumber) = @_;

    if ( !$itemnumber ) {
        return;
    }

    my $dbh = C4::Context->dbh;

    my ( $sth, @results );
    $sth = $dbh->prepare(
"SELECT holdingbranch, colBranchcode FROM items, collections, collections_tracking
                        WHERE items.itemnumber = collections_tracking.itemnumber
                        AND collections.colId = collections_tracking.colId
                        AND items.itemnumber = ?"
    );
    $sth->execute($itemnumber);

    my $row = $sth->fetchrow_hashref;

    return ( $$row{'holdingbranch'}, $$row{'colBranchcode'}, );
}

=head2 isItemInThisCollection

  $inCollection = isItemInThisCollection( $itemnumber, $colId );

=cut

sub isItemInThisCollection {
    my ( $itemnumber, $colId ) = @_;

    my $dbh = C4::Context->dbh;

    my $sth = $dbh->prepare(
"SELECT COUNT(*) as inCollection FROM collections_tracking WHERE itemnumber = ? AND colId = ?"
    );
    $sth->execute( $itemnumber, $colId ) or return (0);

    my $row = $sth->fetchrow_hashref;

    return $$row{'inCollection'};
}

=head2 isItemInAnyCollection

$inCollection = isItemInAnyCollection( $itemnumber );

=cut

sub isItemInAnyCollection {
    my ($itemnumber) = @_;

    my $dbh = C4::Context->dbh;

    my $sth = $dbh->prepare(
        "SELECT itemnumber FROM collections_tracking WHERE itemnumber = ?");
    $sth->execute($itemnumber) or return (0);

    my $row = $sth->fetchrow_hashref;

    $itemnumber = $row->{itemnumber};
    if ($itemnumber) {
        return 1;
    }
    else {
        return 0;
    }
}

1;

__END__

=head1 AUTHOR

Kyle Hall <kylemhall@gmail.com>

=cut