#!/usr/bin/perl

# Copyright Katipo Communications 2002
# Copyright Koha Development team 2012
#
# 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 <https://www.gnu.org/licenses>.

use Modern::Perl;

use CGI             qw ( -utf8 );
use C4::Auth        qw( get_template_and_user );
use C4::Koha        qw( getitemtypeimagelocation getitemtypeimagesrc );
use C4::Circulation qw( GetBranchItemRule );
use C4::Reserves    qw( CanItemBeReserved CanBookBeReserved AddReserve IsAvailableForItemLevelRequest GetReserveFee );
use C4::Biblio      qw( GetBiblioData GetFrameworkCode );
use C4::Output      qw( output_html_with_http_headers );
use C4::Context;
use C4::Members;
use C4::Overdues;

use Koha::AuthorisedValues;
use Koha::Biblios;
use Koha::CirculationRules;
use Koha::DateUtils qw( dt_from_string );
use Koha::Items;
use Koha::ItemTypes;
use Koha::Checkouts;
use Koha::Libraries;
use Koha::Logger;
use Koha::Patrons;
use List::MoreUtils qw( uniq );

my $maxreserves = C4::Context->preference("maxreserves");

my $query = CGI->new;
my $op    = $query->param('op') // q{};

# if OPACHoldRequests (for placing holds) is disabled, leave immediately
if ( !C4::Context->preference('OPACHoldRequests') ) {
    print $query->redirect("/cgi-bin/koha/errors/404.pl");
    exit;
}

my ( $template, $borrowernumber, $cookie ) = get_template_and_user(
    {
        template_name => "opac-reserve.tt",
        query         => $query,
        type          => "opac",
    }
);

my $patron   = Koha::Patrons->find( $borrowernumber, { prefetch => ['categorycode'] } );
my $category = $patron->category;

my $can_place_hold_if_available_at_pickup = C4::Context->preference('OPACHoldsIfAvailableAtPickup');
unless ($can_place_hold_if_available_at_pickup) {
    my @patron_categories = split ',', C4::Context->preference('OPACHoldsIfAvailableAtPickupExceptions');
    if (@patron_categories) {
        my $categorycode = $patron->categorycode;
        $can_place_hold_if_available_at_pickup = grep { $_ eq $categorycode } @patron_categories;
    }
}

my $itemtypes = { map { $_->{itemtype} => $_ } @{ Koha::ItemTypes->search_with_localization->unblessed } };

# There are two ways of calling this script, with a single biblio num
# or multiple biblio nums.
my $biblionumbers = $query->param('biblionumbers');
my $reserveMode   = $query->param('reserve_mode');
if ( $reserveMode && ( $reserveMode eq 'single' ) ) {
    my $bib = $query->param('single_bib');
    $biblionumbers = "$bib/";
}
if ( !$biblionumbers ) {
    $biblionumbers = $query->param('biblionumber');
}

if ( !$biblionumbers && $op ne 'cud-place_reserve' ) {
    $template->param( message => 1, no_biblionumber => 1 );
    output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };
    exit;
}

# Pass the numbers to the page so they can be fed back
# when the hold is confirmed. TODO: Not necessary?
$template->param( biblionumbers => $biblionumbers );

# Each biblio number is suffixed with '/', e.g. "1/2/3/"
my @biblionumbers = split /\//, $biblionumbers;
if ( $#biblionumbers < 0 && $op ne 'cud-place_reserve' ) {

    # TODO: New message?
    $template->param( message => 1, no_biblionumber => 1 );
    output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };
    exit;
}

#
#
# Here we check that the borrower can actually make reserves Stage 1.
#
#

my $can_place_holds = $patron->can_place_holds( { no_short_circuit => 1 } );

if ( !$can_place_holds ) {

    $template->param( message => 1 );

    my $messages = $can_place_holds->messages();
    foreach my $msg ( @{$messages} ) {
        if ( $msg->message eq 'expired' ) {
            $template->param( expired_patron => 1 );
        } elsif ( $msg->message eq 'debt_limit' ) {
            $template->param( too_much_oweing => sprintf( "%.02f", $msg->{payload}->{total_outstanding} ) );
        } elsif ( $msg->message eq 'bad_address' ) {
            $template->param( GNA => 1 );
        } elsif ( $msg->message eq 'card_lost' ) {
            $template->param( lost => 1 );
        } elsif ( $msg->message eq 'restricted' ) {
            $template->param(
                debarred         => 1,
                debarred_comment => $patron->debarredcomment,
                debarred_date    => $patron->debarred,
            );
        } elsif ( $msg->message eq 'hold_limit' ) {
            $template->param( too_many_reserves => $msg->{payload}->{total_holds} );
        } else {
            Koha::Logger->get->warn( sprintf( "Unhandled 'can_place_holds' error code: %s", $msg->message ) );
        }
    }

    output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };
    exit;
}

my $reserves_count = $patron->holds->count;

# pass the pickup branch along....
my $branch = $query->param('branch') || $patron->branchcode || C4::Context->userenv->{branch} || '';
$template->param( branch => $branch );

#
#
# Here we are carrying out the hold request, possibly
# with a specific item for each biblionumber.
#
#
if ( $op eq 'cud-place_reserve' ) {
    my $add_to_hold_group = $query->param('add_to_hold_group');
    my $reserve_cnt       = 0;
    if ($maxreserves) {
        $reserve_cnt = $patron->holds->count_holds;
    }

    # List is composed of alternating biblio/item/branch
    my $selectedItems = $query->param('selecteditems');

    if ( $query->param('reserve_mode') eq 'single' ) {

        # This indicates non-JavaScript mode, so there was
        # only a single biblio number selected.
        my $bib  = $query->param('single_bib');
        my $item = $query->param("checkitem_$bib");
        if ( $item eq 'any' ) {
            $item = '';
        }
        my $branch = $query->param('branch');
        $selectedItems = "$bib/$item/$branch/";
    }

    $selectedItems =~ s!/$!!;
    my @selectedItems = split /\//, $selectedItems, -1;

    # Make sure there is a biblionum/itemnum/branch triplet for each item.
    # The itemnum can be 'any', meaning next available.
    my $selectionCount = @selectedItems;
    if ( ( $selectionCount == 0 ) || ( ( $selectionCount % 3 ) != 0 ) ) {
        $template->param( message => 1, bad_data => 1 );
        output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };
        exit;
    }

    my @failed_holds;
    my @successful_hold_ids;
    while (@selectedItems) {
        my $biblioNum = shift(@selectedItems);
        my $itemNum   = shift(@selectedItems);
        my $branch    = shift(@selectedItems);    # i.e., branch code, not name

        my $canreserve = 0;

        my $singleBranchMode = Koha::Libraries->search->count == 1;
        if ( $singleBranchMode || !C4::Context->preference("OPACAllowUserToChooseBranch") )
        {                                         # single branch mode or disabled user choosing
            $branch = $patron->branchcode;
        }

        # FIXME We shouldn't need to fetch the item here
        my $item = $itemNum ? Koha::Items->find($itemNum) : undef;

        # When choosing a specific item, the default pickup library should be dictated by the default hold policy
        if ( !C4::Context->preference("OPACAllowUserToChooseBranch") && $item ) {
            my $type                    = $item->effective_itemtype;
            my $reserves_control_branch = Koha::Policy::Holds->holds_control_library( $item, $patron );
            my $rule                    = GetBranchItemRule( $reserves_control_branch, $type );

            if ( $rule->{hold_fulfillment_policy} eq 'any' || $rule->{hold_fulfillment_policy} eq 'patrongroup' ) {
                $branch = $patron->branchcode;
            } elsif ( $rule->{hold_fulfillment_policy} eq 'holdgroup' ) {
                $branch = $item->homebranch;
            } else {
                my $policy = $rule->{hold_fulfillment_policy};
                $branch = $item->$policy;
            }
        }

        # if we have an item, we are placing the hold on the item's bib, in case of analytics
        if ($item) {
            $biblioNum = $item->biblionumber;
        }

        # Check for user supplied reserve date
        my $startdate;
        if (   C4::Context->preference('AllowHoldDateInFuture')
            && C4::Context->preference('OPACAllowHoldDateInFuture') )
        {
            $startdate = $query->param("reserve_date_$biblioNum");
        }

        my $patron_expiration_date = $query->param("expiration_date_$biblioNum");

        my $itemtype = $query->param('itemtype') || undef;
        $itemtype = undef if $itemNum;

        my $biblio = Koha::Biblios->find($biblioNum);
        my $rank   = $biblio->holds->search( { found => [ { "!=" => "W" }, undef ] } )->count + 1;
        if ($item) {
            my $status = CanItemBeReserved( $patron, $item, $branch, { get_from_cache => 1 } )->{status};
            if ( $status eq 'OK' ) {
                $canreserve = 1;
            } else {
                push @failed_holds, $status;
            }

        } else {
            my $status = CanBookBeReserved( $borrowernumber, $biblioNum, $branch, { itemtype => $itemtype } )->{status};
            if ( $status eq 'OK' ) {
                $canreserve = 1;
            } else {
                push @failed_holds, $status;
            }

            # Inserts a null into the 'itemnumber' field of 'reserves' table.
            $itemNum = undef;
        }
        my $notes         = $query->param( 'notes_' . $biblioNum )    || '';
        my $item_group_id = $query->param("item_group_id_$biblioNum") || undef;

        if (   $maxreserves
            && $reserve_cnt >= $maxreserves )
        {
            push @failed_holds, 'tooManyReserves';
            $canreserve = 0;
        }

        unless ($can_place_hold_if_available_at_pickup) {
            my $items_in_this_library = Koha::Items->search( { biblionumber => $biblioNum, holdingbranch => $branch } );
            my $nb_of_items_issued =
                $items_in_this_library->search( { 'issue.itemnumber' => { not => undef } }, { join => 'issue' } )
                ->count;
            my $nb_of_items_unavailable =
                $items_in_this_library->search( { -or => { lost => { '!=' => 0 }, damaged => { '!=' => 0 }, } } );
            if ( $items_in_this_library->count > $nb_of_items_issued + $nb_of_items_unavailable ) {
                $canreserve = 0;
                push @failed_holds, 'items_available';
            }
        }

        # Here we actually do the reserveration. Stage 3.
        if ($canreserve) {
            my $reserve_id = AddReserve(
                {
                    branchcode       => $branch,
                    borrowernumber   => $borrowernumber,
                    biblionumber     => $biblioNum,
                    priority         => $rank,
                    reservation_date => $startdate,
                    expiration_date  => $patron_expiration_date,
                    notes            => $notes,
                    title            => $biblio->title,
                    itemnumber       => $itemNum,
                    found            => undef,
                    itemtype         => $itemtype,
                    item_group_id    => $item_group_id,
                }
            );
            if ($reserve_id) {
                ++$reserve_cnt;
                push @successful_hold_ids, $reserve_id;
            } else {
                push @failed_holds, 'not_placed';
            }
        }
    }

    $patron->create_hold_group( \@successful_hold_ids ) if $add_to_hold_group;

    print $query->redirect( "/cgi-bin/koha/opac-user.pl?"
            . ( @failed_holds ? "failed_holds=" . join( '|', @failed_holds ) : q|| )
            . "&opac-user-holds=1" );
    exit;
}

#
#
# Build hashes of the requested biblio(item)s and items.
#
#

my %biblioDataHash;    # Hash of biblionumber to biblio/biblioitems record.
foreach my $biblioNumber (@biblionumbers) {

    my $biblioData = GetBiblioData($biblioNumber);
    $biblioDataHash{$biblioNumber} = $biblioData;

    my $biblio = Koha::Biblios->find($biblioNumber);
    next unless $biblio;

    my $items = Koha::Items->search_ordered(
        [
            'me.biblionumber' => $biblioNumber,
            'me.itemnumber'   => { -in => [ $biblio->host_items->get_column('itemnumber') ] }
        ],
        { prefetch => [ 'issue', 'homebranch', 'holdingbranch' ] }
    )->filter_by_visible_in_opac( { patron => $patron } );

    $biblioData->{items} = [ $items->as_list ];    # FIXME Potentially a lot in memory here!

    # Compute the priority rank.
    $biblioData->{object} = $biblio;
    my $reservecount = $biblio->holds->search( { found => [ { "!=" => "W" }, undef ] } )->count;
    $biblioData->{reservecount} = $reservecount;
    $biblioData->{rank}         = $reservecount + 1;
}

my $requested_reserves_count = scalar(@biblionumbers);
if ( $maxreserves && ( $reserves_count + $requested_reserves_count > $maxreserves ) ) {
    $template->param( new_reserves_allowed => $maxreserves - $reserves_count );
}

$template->param( select_item_types => 1 );

#
#
# Build the template parameters that will show the info
# and items for each biblionumber.
#
#

my $biblioLoop         = [];
my $numBibsAvailable   = 0;
my $itemdata_enumchron = 0;
my $itemdata_ccode     = 0;
my $anyholdable        = 0;
my $itemLevelTypes     = C4::Context->preference('item-level_itypes');
my $pickup_locations   = Koha::Libraries->search( { pickup_location => 1 } );
$template->param( 'item_level_itypes' => $itemLevelTypes );

my $patron_unblessed = $patron->unblessed;
foreach my $biblioNum (@biblionumbers) {

    # Init the bib item with the choices for branch pickup
    my %biblioLoopIter;

    # Get relevant biblio data.
    my $biblioData = $biblioDataHash{$biblioNum};
    if ( !$biblioData ) {
        $template->param( message => 1, bad_biblionumber => $biblioNum );
        output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };
        exit;
    }

    my @not_available_at = ();
    my $biblio           = $biblioData->{object};
    foreach my $library ( $pickup_locations->as_list ) {
        push( @not_available_at, $library->branchcode ) unless $biblio->can_be_transferred( { to => $library } );
    }

    my $frameworkcode = GetFrameworkCode( $biblioData->{biblionumber} );
    $biblioLoopIter{biblionumber}     = $biblioData->{biblionumber};
    $biblioLoopIter{title}            = $biblioData->{title};
    $biblioLoopIter{subtitle}         = $biblioData->{'subtitle'};
    $biblioLoopIter{medium}           = $biblioData->{medium};
    $biblioLoopIter{part_number}      = $biblioData->{part_number};
    $biblioLoopIter{part_name}        = $biblioData->{part_name};
    $biblioLoopIter{author}           = $biblioData->{author};
    $biblioLoopIter{rank}             = $biblioData->{rank};
    $biblioLoopIter{reservecount}     = $biblioData->{reservecount};
    $biblioLoopIter{already_reserved} = $biblioData->{already_reserved};
    $biblioLoopIter{object}           = $biblio;

    if ( !$itemLevelTypes && $biblioData->{itemtype} ) {
        $biblioLoopIter{translated_description} = $itemtypes->{ $biblioData->{itemtype} }{translated_description};
        $biblioLoopIter{imageurl} = getitemtypeimagesrc() . "/" . $itemtypes->{ $biblioData->{itemtype} }{imageurl};
    }

    $biblioLoopIter{itemLoop} = [];
    my $numCopiesAvailable     = 0;
    my $numCopiesOPACAvailable = 0;

    # iterating through all items first to check if any of them available
    # to pass this value further inside down to IsAvailableForItemLevelRequest to
    # it's complicated logic to analyse.
    # (before this loop was inside that sub loop so it was O(n^2) )
    foreach my $item ( @{ $biblioData->{items} } ) {

        my $item_info = $item->unblessed;
        $item_info->{holding_branch} = $item->holding_branch;
        $item_info->{home_branch}    = $item->home_branch;
        if ($itemLevelTypes) {
            my $itemtype = $item->itemtype;
            $item_info->{'imageurl'} = getitemtypeimagelocation(
                'opac',
                $itemtypes->{ $itemtype->itemtype }->{'imageurl'}
            );
            $item_info->{'translated_description'} =
                $itemtypes->{ $itemtype->itemtype }->{translated_description};
        }

        # checking for holds
        my $holds = $item->current_holds;
        if ( my $first_hold = $holds->next ) {
            $item_info->{first_hold} = $first_hold;
        }

        $item_info->{checkout} = $item->checkout;

        # Check of the transferred documents
        my $transfer = $item->get_transfer;
        if ( $transfer && $transfer->in_transit ) {
            $item_info->{transfertwhen} = $transfer->datesent;
            $item_info->{transfertfrom} = $transfer->frombranch;
            $item_info->{transfertto}   = $transfer->tobranch;
            $item_info->{nocancel}      = 1;
        }

        # if the items belongs to a host record, show link to host record
        if ( $item_info->{biblionumber} ne $biblioNum ) {
            $item_info->{hostbiblionumber} = $item->biblionumber;
            $item_info->{hosttitle}        = Koha::Biblios->find( $item_info->{biblionumber} )->title;
        }

        my $branch = Koha::Policy::Holds->holds_control_library( $item, $patron );

        my $policy_holdallowed = CanItemBeReserved( $patron, $item, undef, { get_from_cache => 1 } )->{status} eq 'OK'
            && IsAvailableForItemLevelRequest( $item, $patron, undef );

        if ($policy_holdallowed) {
            my $opac_hold_policy =
                Koha::CirculationRules->get_opacitemholds_policy( { item => $item, patron => $patron } );
            if ( $opac_hold_policy ne 'N' ) {    # If Y or F
                $item_info->{available} = 1;
                $numCopiesOPACAvailable++;
                $biblioLoopIter{force_hold} = 1 if $opac_hold_policy eq 'F';
            }
            $numCopiesAvailable++;
        }

        unless ($can_place_hold_if_available_at_pickup) {
            my $items_in_this_library = Koha::Items->search(
                { biblionumber => $item->biblionumber, holdingbranch => $item->holdingbranch, notforloan => 0 } );
            my $nb_of_items_issued =
                $items_in_this_library->search( { 'issue.itemnumber' => { not => undef } }, { join => 'issue' } )
                ->count;
            if ( $items_in_this_library->count > $nb_of_items_issued ) {
                push @not_available_at, $item->holdingbranch;
            }
        }

        # Show serial enumeration when needed
        if ( $item_info->{enumchron} ) {
            $itemdata_enumchron = 1;
        }

        # Show collection when needed
        if ( $item_info->{ccode} ) {
            $itemdata_ccode = 1;
        }

        push @{ $biblioLoopIter{itemLoop} }, $item_info;
    }
    $template->param(
        itemdata_enumchron => $itemdata_enumchron,
        itemdata_ccode     => $itemdata_ccode,
    );

    if ( $numCopiesAvailable > 0 ) {
        $numBibsAvailable++;
        $biblioLoopIter{bib_available} = 1;
        $biblioLoopIter{holdable}      = 1;
        $biblioLoopIter{itemholdable}  = 1 if $numCopiesOPACAvailable;
    }
    if ( $biblioLoopIter{already_reserved} ) {
        $biblioLoopIter{holdable}     = undef;
        $biblioLoopIter{itemholdable} = undef;
    }
    if ( $biblioLoopIter{holdable} ) {
        @not_available_at = uniq @not_available_at;
        $biblioLoopIter{not_available_at} = \@not_available_at;
    }

    unless ($can_place_hold_if_available_at_pickup) {
        @not_available_at = uniq @not_available_at;
        $biblioLoopIter{not_available_at} = \@not_available_at;

        # The record is not holdable is not available at any of the libraries
        if ( Koha::Libraries->search->count == @not_available_at ) {
            $biblioLoopIter{holdable} = 0;
        }
    }

    my $status = CanBookBeReserved( $borrowernumber, $biblioNum )->{status};
    $biblioLoopIter{holdable} &&= $status eq 'OK';
    $biblioLoopIter{$status} = 1;

    if ( $biblioLoopIter{holdable} and C4::Context->preference('AllowHoldItemTypeSelection') ) {

        # build the allowed item types loop
        my $rs = $biblio->items->search_ordered(
            undef,
            {
                select => [ { distinct => 'itype' } ],
                as     => 'item_type'
            }
        );

        my @item_types =
            grep { CanBookBeReserved( $borrowernumber, $biblioNum, $branch, { itemtype => $_ } )->{status} eq 'OK' }
            $rs->get_column('item_type');

        $biblioLoopIter{allowed_item_types} = \@item_types;
    }

    if ( $status eq 'recall' ) {
        $biblioLoopIter{recall} = 1;
    }

    # For multiple holds per record, if a patron has previously placed a hold,
    # the patron can only place more holds of the same type. That is, if the
    # patron placed a record level hold, all the holds the patron places must
    # be record level. If the patron placed an item level hold, all holds
    # the patron places must be item level
    my $forced_hold_level = Koha::Holds->search(
        {
            borrowernumber => $borrowernumber,
            biblionumber   => $biblioNum,
            found          => undef,
        }
    )->forced_hold_level();
    if ($forced_hold_level) {
        $biblioLoopIter{force_hold}        = 1 if $forced_hold_level eq 'item';
        $biblioLoopIter{force_hold}        = 0 if $forced_hold_level eq 'item_group';
        $biblioLoopIter{itemholdable}      = 0 if $forced_hold_level eq 'record';
        $biblioLoopIter{itemholdable}      = 0 if $forced_hold_level eq 'item_group';
        $biblioLoopIter{forced_hold_level} = $forced_hold_level;
    }

    # Pass through any reserve charge
    $biblioLoopIter{reserve_charge} = GetReserveFee( $patron->id, $biblioNum );

    push @$biblioLoop, \%biblioLoopIter;

    $anyholdable = 1 if $biblioLoopIter{holdable};
}

unless ( $pickup_locations->count ) {
    $numBibsAvailable = 0;
    $anyholdable      = 0;
    $template->param(
        message             => 1,
        no_pickup_locations => 1
    );
}

if ( $numBibsAvailable == 0 || $anyholdable == 0 ) {
    $template->param( none_available => 1 );
}

if ( scalar @biblionumbers > 1 ) {
    $template->param( multi_hold => 1 );
}

my $show_notes = C4::Context->preference('OpacHoldNotes');
$template->param( OpacHoldNotes => $show_notes );

# display infos
$template->param( bibitemloop => $biblioLoop );

# can set reserve date in future
if (   C4::Context->preference('AllowHoldDateInFuture')
    && C4::Context->preference('OPACAllowHoldDateInFuture') )
{
    $template->param(
        reserve_in_future => 1,
    );
}

output_html_with_http_headers $query, $cookie, $template->output, undef, { force_no_caching => 1 };