#!/usr/bin/perl


# Copyright 2000-2002 Katipo Communications
# Parts copyright 2010 BibLibre
#
# 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::Output;
use CGI qw(-oldstyle_urls -utf8);
use C4::Auth;
use C4::Branch;
use C4::Debug;
use Text::CSV_XS;
use Koha::DateUtils;
use DateTime;

my $input = new CGI;
my $order           = $input->param('order') || '';
my $showall         = $input->param('showall');
my $bornamefilter   = $input->param('borname') || '';
my $borcatfilter    = $input->param('borcat') || '';
my $itemtypefilter  = $input->param('itemtype') || '';
my $borflagsfilter  = $input->param('borflag') || '';
my $branchfilter    = $input->param('branch') || '';
my $homebranchfilter    = $input->param('homebranch') || '';
my $holdingbranchfilter = $input->param('holdingbranch') || '';
my $op              = $input->param('op') || '';

my ($dateduefrom, $datedueto);
if ( $dateduefrom = $input->param('dateduefrom') ) {
    $dateduefrom = dt_from_string( $dateduefrom );
}
if ( $datedueto = $input->param('datedueto') ) {
    $datedueto = dt_from_string( $datedueto )->set_hour(23)->set_minute(59);
}

my $isfiltered      = $op =~ /apply/i && $op =~ /filter/i;
my $noreport        = C4::Context->preference('FilterBeforeOverdueReport') && ! $isfiltered && $op ne "csv";

my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
    {
        template_name   => "circ/overdue.tt",
        query           => $input,
        type            => "intranet",
        authnotrequired => 0,
        flagsrequired   => { circulate => "overdues_report" },
        debug           => 1,
    }
);

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

my $req;
$req = $dbh->prepare( "select categorycode, description from categories order by description");
$req->execute;
my @borcatloop;
while (my ($catcode, $description) =$req->fetchrow) {
    push @borcatloop, {
        value    => $catcode,
        selected => $catcode eq $borcatfilter ? 1 : 0,
        catname  => $description,
    };
}

$req = $dbh->prepare( "select itemtype, description from itemtypes order by description");
$req->execute;
my @itemtypeloop;
while (my ($itemtype, $description) =$req->fetchrow) {
    push @itemtypeloop, {
        value        => $itemtype,
        selected     => $itemtype eq $itemtypefilter ? 1 : 0,
        itemtypename => $description,
    };
}
my $onlymine =
     C4::Context->preference('IndependentBranches')
  && C4::Context->userenv
  && !C4::Context->IsSuperLibrarian()
  && C4::Context->userenv->{branch};

$branchfilter = C4::Context->userenv->{'branch'} if ($onlymine && !$branchfilter);

# Filtering by Patron Attributes
#  @patron_attr_filter_loop        is non empty if there are any patron attribute filters
#  %cgi_attrcode_to_attrvalues     contains the patron attribute filter values, as returned by the CGI
#  %borrowernumber_to_attributes   is populated by those borrowernumbers matching the patron attribute filters

my %cgi_attrcode_to_attrvalues;     # ( patron_attribute_code => [ zero or more attribute filter values from the CGI ] )
for my $attrcode (grep { /^patron_attr_filter_/ } $input->param) {
    if (my @attrvalues = grep { length($_) > 0 } $input->param($attrcode)) {
        $attrcode =~ s/^patron_attr_filter_//;
        $cgi_attrcode_to_attrvalues{$attrcode} = \@attrvalues;
        print STDERR ">>>param($attrcode)[@{[scalar @attrvalues]}] = '@attrvalues'\n" if $debug;
    }
}
my $have_pattr_filter_data = keys(%cgi_attrcode_to_attrvalues) > 0;

my @patron_attr_filter_loop;   # array of [ domid cgivalue ismany isclone ordinal code description repeatable authorised_value_category ]
my @patron_attr_order_loop;    # array of { label => $patron_attr_label, value => $patron_attr_order }

my @sort_roots = qw(borrower title barcode date_due);
push @sort_roots, map {$_ . " desc"} @sort_roots;
my @order_loop = ({selected => $order ? 0 : 1});   # initial blank row
foreach (@sort_roots) {
    my $tmpl_name = $_;
    $tmpl_name =~ s/\s/_/g;
    push @order_loop, {
        selected => $order eq $_ ? 1 : 0,
        ordervalue => $_,
        'order_' . $tmpl_name => 1,
    };
}

my $sth = $dbh->prepare('SELECT code,description,repeatable,authorised_value_category
    FROM borrower_attribute_types
    WHERE staff_searchable <> 0
    ORDER BY description');
$sth->execute();
my $ordinal = 0;
while (my $row = $sth->fetchrow_hashref) {
    $row->{ordinal} = $ordinal;
    my $code = $row->{code};
    my $cgivalues = $cgi_attrcode_to_attrvalues{$code} || [ '' ];
    my $isclone = 0;
    $row->{ismany} = @$cgivalues > 1;
    my $serial = 0;
    for (@$cgivalues) {
        $row->{domid} = $ordinal * 1000 + $serial;
        $row->{cgivalue} = $_;
        $row->{isclone} = $isclone;
        push @patron_attr_filter_loop, { %$row };  # careful: must store a *deep copy* of the modified row
    } continue { $isclone = 1, ++$serial }
    foreach my $sortorder ('asc', 'desc') {
        my $ordervalue = "patron_attr_${sortorder}_${code}";
        push @order_loop, {
            selected => $order eq $ordervalue ? 1 : 0,
            ordervalue => $ordervalue,
            label => $row->{description},
            $sortorder => 1,
        };
    }
} continue { ++$ordinal }
for (@patron_attr_order_loop) { $_->{selected} = 1 if $order eq $_->{value} }

$template->param(ORDER_LOOP => \@order_loop);

my %borrowernumber_to_attributes;    # hash of { borrowernumber => { attrcode => [ [val,display], [val,display], ... ] } }
                                     #   i.e. val differs from display when attr is an authorised value
if (@patron_attr_filter_loop) {
    # MAYBE FIXME: currently, *all* borrower_attributes are loaded into %borrowernumber_to_attributes
    #              then filtered and honed down to match the patron attribute filters. If this is
    #              too resource intensive, MySQL can be used to do the filtering, i.e. rewire the
    #              SQL below to select only those attribute values that match the filters.

    my $sql = q(SELECT borrowernumber AS bn, b.code, attribute AS val, category AS avcategory, lib AS avdescription
        FROM borrower_attributes b
        JOIN borrower_attribute_types bt ON (b.code = bt.code)
        LEFT JOIN authorised_values a ON (a.category = bt.authorised_value_category AND a.authorised_value = b.attribute));
    my $sth = $dbh->prepare($sql);
    $sth->execute();
    while (my $row = $sth->fetchrow_hashref) {
        my $pattrs = $borrowernumber_to_attributes{$row->{bn}} ||= { };
        push @{ $pattrs->{$row->{code}} }, [
            $row->{val},
            defined $row->{avdescription} ? $row->{avdescription} : $row->{val},
        ];
    }

    for my $bn (keys %borrowernumber_to_attributes) {
        my $pattrs = $borrowernumber_to_attributes{$bn};
        my $keep = 1;
        for my $code (keys %cgi_attrcode_to_attrvalues) {
            # discard patrons that do not match (case insensitive) at least one of each attribute filter value
            my $discard = 1;
            for my $attrval (map { lc $_ } @{ $cgi_attrcode_to_attrvalues{$code} }) {
                ## if (grep { $attrval eq lc($_->[0]) } @{ $pattrs->{$code} })
                if (grep { $attrval eq lc($_->[1]) } @{ $pattrs->{$code} }) {
                    $discard = 0;
                    last;
                }
            }
            if ($discard) {
                $keep = 0;
                last;
            }
        }
        if ($debug) {
            my $showkeep = $keep ? 'keep' : 'do NOT keep';
            print STDERR ">>> patron $bn: $showkeep attributes: ";
            for (sort keys %$pattrs) { my @a=map { "$_->[0]/$_->[1]  " } @{$pattrs->{$_}}; print STDERR "attrcode $_ = [@a] " }
            print STDERR "\n";
        }
        delete $borrowernumber_to_attributes{$bn} if !$keep;
    }
}


$template->param(
    patron_attr_header_loop => [ map { { header => $_->{description} } } grep { ! $_->{isclone} } @patron_attr_filter_loop ],
    branchloop   => GetBranchesLoop($branchfilter, $onlymine),
    homebranchloop => GetBranchesLoop( $homebranchfilter, $onlymine ),
    holdingbranchloop => GetBranchesLoop( $holdingbranchfilter, $onlymine ),
    branchfilter => $branchfilter,
    homebranchfilter => $homebranchfilter,
    holdingbranchfilter => $homebranchfilter,
    borcatloop=> \@borcatloop,
    itemtypeloop => \@itemtypeloop,
    patron_attr_filter_loop => \@patron_attr_filter_loop,
    borname => $bornamefilter,
    order => $order,
    showall => $showall,
    dateduefrom => $dateduefrom,
    datedueto   => $datedueto,
);

if ($noreport) {
    # la de dah ... page comes up presto-quicko
    $template->param( noreport  => $noreport );
} else {
    # FIXME : the left joins + where clauses make the following SQL query really slow with large datasets :(
    #
    #  FIX 1: use the table with the least rows as first in the join, second least second, etc
    #         ref: http://www.fiftyfoureleven.com/weblog/web-development/programming-and-scripts/mysql-optimization-tip
    #
    #  FIX 2: ensure there are indexes for columns participating in the WHERE clauses, where feasible/reasonable


    my $today_dt = DateTime->now(time_zone => C4::Context->tz);
    $today_dt->truncate(to => 'minute');
    my $todaysdate = $today_dt->strftime('%Y-%m-%d %H:%M');

    $bornamefilter =~s/\*/\%/g;
    $bornamefilter =~s/\?/\_/g;

    my $strsth="SELECT date_due,
        borrowers.title as borrowertitle,
        borrowers.surname,
        borrowers.firstname,
        borrowers.streetnumber,
        borrowers.streettype, 
        borrowers.address,
        borrowers.address2,
        borrowers.city,
        borrowers.zipcode,
        borrowers.country,
        borrowers.phone,
        borrowers.email,
        borrowers.cardnumber,
        issues.itemnumber,
        issues.issuedate,
        items.barcode,
        items.homebranch,
        items.holdingbranch,
        biblio.title,
        biblio.author,
        borrowers.borrowernumber,
        biblio.biblionumber,
        borrowers.branchcode,
        items.itemcallnumber,
        items.replacementprice,
        items.enumchron
      FROM issues
    LEFT JOIN borrowers   ON (issues.borrowernumber=borrowers.borrowernumber )
    LEFT JOIN items       ON (issues.itemnumber=items.itemnumber)
    LEFT JOIN biblioitems ON (biblioitems.biblioitemnumber=items.biblioitemnumber)
    LEFT JOIN biblio      ON (biblio.biblionumber=items.biblionumber )
    WHERE 1=1 "; # placeholder, since it is possible that none of the additional
                 # conditions will be selected by user
    $strsth.=" AND date_due               < '" . $todaysdate     . "' " unless ($showall);
    $strsth.=" AND (borrowers.firstname like '".$bornamefilter."%' or borrowers.surname like '".$bornamefilter."%' or borrowers.cardnumber like '".$bornamefilter."%')" if($bornamefilter) ;
    $strsth.=" AND borrowers.categorycode = '" . $borcatfilter   . "' " if $borcatfilter;
    if( $itemtypefilter ){
        if( C4::Context->preference('item-level_itypes') ){
            $strsth.=" AND items.itype   = '" . $itemtypefilter . "' ";
        } else {
            $strsth.=" AND biblioitems.itemtype   = '" . $itemtypefilter . "' ";
        }
    }
    if ( $borflagsfilter eq 'gonenoaddress' ) {
        $strsth .= " AND borrowers.gonenoaddress <> 0";
    }
    elsif ( $borflagsfilter eq 'debarred' ) {
        $strsth .= " AND borrowers.debarred >=  CURDATE()" ;
    }
    elsif ( $borflagsfilter eq 'lost') {
        $strsth .= " AND borrowers.lost <> 0";
    }
    $strsth.=" AND borrowers.branchcode   = '" . $branchfilter   . "' " if $branchfilter;
    $strsth.=" AND items.homebranch       = '" . $homebranchfilter . "' " if $homebranchfilter;
    $strsth.=" AND items.holdingbranch    = '" . $holdingbranchfilter . "' " if $holdingbranchfilter;
    $strsth.=" AND date_due >= ?" if $dateduefrom;
    $strsth.=" AND date_due <= ?" if $datedueto;
    # restrict patrons (borrowers) to those matching the patron attribute filter(s), if any
    my $bnlist = $have_pattr_filter_data ? join(',',keys %borrowernumber_to_attributes) : '';
    $strsth =~ s/WHERE 1=1/WHERE 1=1 AND borrowers.borrowernumber IN ($bnlist)/ if $bnlist;
    $strsth =~ s/WHERE 1=1/WHERE 0=1/ if $have_pattr_filter_data  && !$bnlist;  # no match if no borrowers matched patron attrs
    $strsth.=" ORDER BY " . (
        ($order eq "borrower")                              ? "surname, firstname, date_due"               : 
        ($order eq "borrower desc")                         ? "surname desc, firstname desc, date_due"     : 
        ($order eq "title"    or $order eq    "title desc") ? "$order, date_due, surname, firstname"       :
        ($order eq "barcode"  or $order eq  "barcode desc") ? "items.$order, date_due, surname, firstname" :
                                ($order eq "date_due desc") ? "date_due DESC, surname, firstname"          :
                                                            "date_due, surname, firstname"  # default sort order
    );
    $template->param(sql=>$strsth);
    my $sth=$dbh->prepare($strsth);
    $sth->execute(
        ($dateduefrom ? output_pref({ dt => $dateduefrom, dateformat => 'iso' }) : ()),
        ($datedueto ? output_pref({ dt => $datedueto, dateformat => 'iso' }) : ()),
    );

    my @overduedata;
    while (my $data = $sth->fetchrow_hashref) {

        # most of the overdue report data is linked to the database schema, i.e. things like borrowernumber and phone
        # but the patron attributes (patron_attr_value_loop) are unnormalised and varies dynamically from one db to the next

        my $pattrs = $borrowernumber_to_attributes{$data->{borrowernumber}} || {};  # patron attrs for this borrower
        # $pattrs is a hash { attrcode => [  [value,displayvalue], [value,displayvalue]... ] }

        my @patron_attr_value_loop;   # template array [ {value=>v1}, {value=>v2} ... } ]
        for my $pattr_filter (grep { ! $_->{isclone} } @patron_attr_filter_loop) {
            my @displayvalues = map { $_->[1] } @{ $pattrs->{$pattr_filter->{code}} };   # grab second value from each subarray
            push @patron_attr_value_loop, { value => join(', ', sort { lc $a cmp lc $b } @displayvalues) };
        }
        my $dt = dt_from_string($data->{date_due}, 'sql');

        push @overduedata, {
            duedate                => output_pref($dt),
            borrowernumber         => $data->{borrowernumber},
            barcode                => $data->{barcode},
            cardnumber             => $data->{cardnumber},
            itemnum                => $data->{itemnumber},
            issuedate              => output_pref({ dt => dt_from_string( $data->{issuedate} ), dateonly => 1 }),
            borrowertitle          => $data->{borrowertitle},
            surname                => $data->{surname},
            firstname              => $data->{firstname},
            streetnumber           => $data->{streetnumber},                   
            streettype             => $data->{streettype},                     
            address                => $data->{address},                        
            address2               => $data->{address2},                       
            city                   => $data->{city},                   
            zipcode                => $data->{zipcode},                        
            country                => $data->{country},
            phone                  => $data->{phone},
            email                  => $data->{email},
            biblionumber           => $data->{biblionumber},
            title                  => $data->{title},
            author                 => $data->{author},
            branchcode             => $data->{branchcode},
            homebranchcode         => $data->{homebranchcode},
            holdingbranchcode      => $data->{holdingbranchcode},
            itemcallnumber         => $data->{itemcallnumber},
            replacementprice       => $data->{replacementprice},
            enumchron              => $data->{enumchron},
            patron_attr_value_loop => \@patron_attr_value_loop,
        };
    }

    my ($attrorder) = $order =~ /patron_attr_(.*)$/; 
    my $patrorder = '';
    my $sortorder = 'asc';
    if (defined $attrorder) {
        ($sortorder, $patrorder) = split /_/, $attrorder, 2;
    }
    print STDERR ">>> order is $order, patrorder is $patrorder, sortorder is $sortorder\n" if $debug;

    if (my @attrtype = grep { $_->{'code'} eq $patrorder } @patron_attr_filter_loop) {        # sort by patron attrs perhaps?
        my $ordinal = $attrtype[0]{ordinal};
        print STDERR ">>> sort ordinal is $ordinal\n" if $debug;

        sub patronattr_sorter_asc {
            lc $a->{patron_attr_value_loop}[$ordinal]{value}
            cmp
            lc $b->{patron_attr_value_loop}[$ordinal]{value} }

        sub patronattr_sorter_des { -patronattr_sorter_asc() }

        my $sorter = $sortorder eq 'desc' ? \&patronattr_sorter_des : \&patronattr_sorter_asc;
        @overduedata = sort $sorter @overduedata;
    }

    if ($op eq 'csv') {
        binmode(STDOUT, ":encoding(UTF-8)");
        my $csv = build_csv(\@overduedata);
        print $input->header(-type => 'application/vnd.sun.xml.calc',
                             -encoding    => 'utf-8',
                             -attachment=>"overdues.csv",
                             -filename=>"overdues.csv" );
        print $csv;
        exit;
    }

    # generate parameter list for CSV download link
    my $new_cgi = CGI->new($input);
    $new_cgi->delete('op');
    my $csv_param_string = $new_cgi->query_string();

    $template->param(
        csv_param_string        => $csv_param_string,
        todaysdate              => output_pref($today_dt),
        overdueloop             => \@overduedata,
        nnoverdue               => scalar(@overduedata),
        noverdue_is_plural      => scalar(@overduedata) != 1,
        noreport                => $noreport,
        isfiltered              => $isfiltered,
        borflag_gonenoaddress   => $borflagsfilter eq 'gonenoaddress',
        borflag_debarred        => $borflagsfilter eq 'debarred',
        borflag_lost            => $borflagsfilter eq 'lost',
    );

}

output_html_with_http_headers $input, $cookie, $template->output;


sub build_csv {
    my $overdues = shift;

    return "" if scalar(@$overdues) == 0;

    my @lines = ();

    # build header ...
    my @keys = qw /duedate title author borrowertitle firstname surname phone barcode email address address2 zipcode city country
                branchcode itemcallnumber biblionumber borrowernumber itemnum issuedate replacementprice streetnumber streettype/;
    my $csv = Text::CSV_XS->new();
    $csv->combine(@keys);
    push @lines, $csv->string();

    # ... and rest of report
    foreach my $overdue ( @{ $overdues } ) {
        push @lines, $csv->string() if $csv->combine(map { $overdue->{$_} } @keys);
    }

    return join("\n", @lines) . "\n";
}