package Koha::Virtualshelf;

# 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::Auth;

use Koha::Patrons;
use Koha::Database;
use Koha::DateUtils qw( dt_from_string );
use Koha::Exceptions;
use Koha::Exceptions::Virtualshelf;
use Koha::Virtualshelfshare;
use Koha::Virtualshelfshares;
use Koha::Virtualshelfcontent;
use Koha::Virtualshelfcontents;

use base qw(Koha::Object);

=head1 NAME

Koha::Virtualshelf - Koha Virtualshelf Object class

=head1 API

=head2 Class methods

=cut

sub store {
    my ( $self ) = @_;

    unless ( $self->owner ) {
        Koha::Exceptions::Virtualshelf::UseDbAdminAccount->throw;
    }

    unless ( $self->is_shelfname_valid ) {
        Koha::Exceptions::Virtualshelf::DuplicateObject->throw;
    }

    $self->allow_change_from_owner( 1 )
        unless defined $self->allow_change_from_owner;
    $self->allow_change_from_others( 0 )
        unless defined $self->allow_change_from_others;
    $self->allow_change_from_staff( 0 )
        unless defined $self->allow_change_from_staff;
    $self->allow_change_from_permitted_staff( 0 )
        unless defined $self->allow_change_from_permitted_staff;

    $self->created_on( dt_from_string )
        unless defined $self->created_on;

    return $self->SUPER::store( $self );
}

sub is_public {
    my ( $self ) = @_;
    return $self->public;
}

sub is_private {
    my ( $self ) = @_;
    return !$self->public;
}

sub is_shelfname_valid {
    my ( $self ) = @_;

    my $conditions = {
        shelfname => $self->shelfname,
        ( $self->shelfnumber ? ( "me.shelfnumber" => { '!=', $self->shelfnumber } ) : () ),
    };

    if ( $self->is_private and defined $self->owner ) {
        $conditions->{-or} = {
            "virtualshelfshares.borrowernumber" => $self->owner,
            "me.owner" => $self->owner,
        };
        $conditions->{public} = 0;
    }
    elsif ( $self->is_private and not defined $self->owner ) {
        $conditions->{owner} = undef;
        $conditions->{public} = 0;
    }
    else {
        $conditions->{public} = 1;
    }

    my $count = Koha::Virtualshelves->search(
        $conditions,
        {
            join => 'virtualshelfshares',
        }
    )->count;
    return $count ? 0 : 1;
}

sub get_shares {
    my ( $self ) = @_;
    my $rs = $self->_result->virtualshelfshares;
    my $shares = Koha::Virtualshelfshares->_new_from_dbic( $rs );
    return $shares;
}

sub get_contents {
    my ( $self ) = @_;
    my $rs = $self->_result->virtualshelfcontents;
    my $contents = Koha::Virtualshelfcontents->_new_from_dbic( $rs );
    return $contents;
}

sub share {
    my ( $self, $key ) = @_;
    unless ( $key ) {
        Koha::Exceptions::Virtualshelf::InvalidKeyOnSharing->throw;
    }
    Koha::Virtualshelfshare->new(
        {
            shelfnumber => $self->shelfnumber,
            invitekey => $key,
            sharedate => dt_from_string,
        }
    )->store;
}

sub is_shared {
    my ( $self ) = @_;
    return  $self->get_shares->search(
        {
            borrowernumber => { '!=' => undef },
        }
    )->count;
}

sub is_shared_with {
    my ( $self, $borrowernumber ) = @_;
    return unless $borrowernumber;
    return  $self->get_shares->search(
        {
            borrowernumber => $borrowernumber,
        }
    )->count;
}

sub remove_share {
    my ( $self, $borrowernumber ) = @_;
    my $shelves = Koha::Virtualshelfshares->search(
        {
            shelfnumber => $self->shelfnumber,
            borrowernumber => $borrowernumber,
        }
    );
    return 0 unless $shelves->count;

    # Only 1 share with 1 patron can exist
    return $shelves->next->delete;
}

sub add_biblio {
    my ( $self, $biblionumber, $borrowernumber ) = @_;
    return unless $biblionumber;
    my $already_exists = $self->get_contents->search(
        {
            biblionumber => $biblionumber,
        }
    )->count;
    return if $already_exists;

    # Check permissions
    my $patron = Koha::Patrons->find( $borrowernumber ) or return 0;
    return 0 unless ( $self->owner == $borrowernumber && $self->allow_change_from_owner ) || ( $self->allow_change_from_staff && $patron->can_patron_change_staff_only_lists ) || ( $self->allow_change_from_permitted_staff && $patron->can_patron_change_permitted_staff_lists ) || $self->allow_change_from_others;

    my $content = Koha::Virtualshelfcontent->new(
        {
            shelfnumber => $self->shelfnumber,
            biblionumber => $biblionumber,
            borrowernumber => $borrowernumber,
        }
    )->store;
    $self->lastmodified(dt_from_string);
    $self->store;

    return $content;
}

sub remove_biblios {
    my ( $self, $params ) = @_;
    my $biblionumbers = $params->{biblionumbers} || [];
    my $borrowernumber = $params->{borrowernumber};
    return unless @$biblionumbers;

    my $number_removed = 0;
    my $patron = Koha::Patrons->find( $borrowernumber ) or return 0;
    if( ( $self->owner == $borrowernumber && $self->allow_change_from_owner )
      || ( $self->allow_change_from_staff && $patron->can_patron_change_staff_only_lists )
      || ( $self->allow_change_from_permitted_staff && $patron->can_patron_change_permitted_staff_lists )
      || $self->allow_change_from_others ) {
        $number_removed += $self->get_contents->search({
            biblionumber => $biblionumbers,
        })->delete;
    }
    return $number_removed;
}

sub can_be_viewed {
    my ( $self, $borrowernumber ) = @_;
    return 1 if $self->is_public;
    return 0 unless $borrowernumber;
    return 1 if $self->owner == $borrowernumber;
    return $self->get_shares->search(
        {
            borrowernumber => $borrowernumber,
        }
    )->count;
}

sub can_be_deleted {
    my ( $self, $borrowernumber ) = @_;

    return 0 unless $borrowernumber;
    return 1 if $self->owner == $borrowernumber;

    my $patron = Koha::Patrons->find( $borrowernumber ) or return 0;

    return 1 if $self->is_public and C4::Auth::haspermission( $patron->userid, { lists => 'delete_public_lists' } );

    return 0;
}

sub can_be_managed {
    my ( $self, $borrowernumber ) = @_;
    return 1
      if $borrowernumber and $self->owner == $borrowernumber;

    my $patron = Koha::Patrons->find( $borrowernumber ) or return 0;
    return 1
      if $self->is_public and C4::Auth::haspermission( $patron->userid, { lists => 'edit_public_lists' } );
    return 0;
}

sub can_biblios_be_added {
    my ( $self, $borrowernumber ) = @_;

    my $patron = Koha::Patrons->find( $borrowernumber ) or return 0;
    return 1
      if $borrowernumber
      and ( ( $self->owner == $borrowernumber && $self->allow_change_from_owner ) or ( $self->allow_change_from_staff && $patron->can_patron_change_staff_only_lists ) or ( $self->allow_change_from_permitted_staff && $patron->can_patron_change_permitted_staff_lists ) or $self->allow_change_from_others );
    return 0;
}

sub can_biblios_be_removed {
    my ( $self, $borrowernumber ) = @_;
    return $self->can_biblios_be_added( $borrowernumber );
    # Same answer since bug 18228
}

=head3 cannot_be_transferred

    $shelf->cannot_be_transferred({
        by => $p1, to => $p2, interface => opac|intranet|undef,
            # p1 and p2 are borrowernumbers
    });

    This routine has two main goals:
    [1] Decide if patron may transfer a shared list to another
        sharee (patron).
    [2] Decide if staff member may transfer a public list.

    If you pass interface, we'll check if it supports transfer too.
    NOTE: The explicit passing is still more reliable than via context,
    since we could switch interface after login in the same session.

    Returns a true value (read: error_code) when not allowed.
    The following error codes are possible:
        unauthorized_transfer, missing_by_parameter, new_owner_not_found,
        new_owner_has_no_share, missing_to_parameter.
    Otherwise returns false (zero).

=cut

sub cannot_be_transferred {
    my ( $self, $params ) = @_;
    my $to = $params->{to};
    my $by = $params->{by};
    my $interface = $params->{interface};

    # Check on interface: currently we don't support transfer shared on intranet, transfer public on OPAC
    if( $interface ) {
        return 'unauthorized_transfer'
            if ( $self->public && $interface eq 'opac' ) or
               ( $self->is_private && $interface eq 'intranet' );
                   # is_private call is enough here, get_shares tested below
    }

    my $shares = $self->public ? undef : $self->get_shares->search({ borrowernumber => { '!=' => undef } });
    return 'unauthorized_transfer' if $self->is_private && !$shares->count;

    if( $by ) {
        if( $self->public ) {
            my $by_patron = Koha::Patrons->find($by);
            return 'unauthorized_transfer'
                if !$by_patron || !C4::Auth::haspermission( $by_patron->userid, { lists => 'edit_public_lists' });
        } else {
            return 'unauthorized_transfer' if !$self->can_be_managed($by);
        }
    } else {
        return 'missing_by_parameter';
    }

    if( $to ) {
        if( !Koha::Patrons->find($to) ) {
            return 'new_owner_not_found';
        }
        if( !$self->public && !$shares->search({ borrowernumber => $to })->count ) {
            return 'new_owner_has_no_share';
        }
    } else {
        return 'missing_to_parameter';
    }
    return 0; # serving as green light
}

=head3 transfer_ownership

    $list->transfer_ownership( $patron_id );

This method transfers the list ownership to the passed I<$patron_id>.

=cut

sub transfer_ownership {
    my ( $self, $patron_id ) = @_;

    Koha::Exceptions::MissingParameter->throw( "Mandatory parameter 'patron' missing" )
      unless $patron_id;

    $self->remove_share( $patron_id ) if $self->is_private;
    return $self->set({ owner => $patron_id })->store;
}

=head2 Internal methods

=head3 _type

=cut

sub _type {
    return 'Virtualshelve';
}

1;