#!/usr/bin/perl


# Copyright 2000-2002 Katipo Communications
#
# 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 2 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, write to the Free Software Foundation, Inc., 59 Temple Place,
# Suite 330, Boston, MA  02111-1307 USA

use strict;
use warnings;
use C4::Context;
use C4::Output;
use CGI qw(-oldstyle_urls);
use C4::Auth;
use C4::Branch;
use C4::Debug;
use C4::Dates qw/format_date/;
use Date::Calc qw/Today/;
use Text::CSV_XS;

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 $op              = $input->param('op') || '';
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.tmpl",
        query           => $input,
        type            => "intranet",
        authnotrequired => 0,
        flagsrequired   => { reports => 1, circulate => "circulate_remaining_permissions" },
        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('IndependantBranches') && 
             C4::Context->userenv &&
             C4::Context->userenv->{flags} % 2 !=1 &&
             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 (0 && @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;
    }
}


$template->param(
    branchloop   => GetBranchesLoop($branchfilter, $onlymine),
    branchfilter => $branchfilter,
    borcatloop=> \@borcatloop,
    itemtypeloop => \@itemtypeloop,
#     patron_attr_filter_loop => \@patron_attr_filter_loop,
    borname => $bornamefilter,
    order => $order,
    showall => $showall);

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 $todaysdate = sprintf("%-04.4d-%-02.2d-%02.2d", Today());

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

    my $strsth="SELECT date_due,
        concat(surname,' ', firstname) as borrower, 
        borrowers.phone,
        borrowers.email,
        issues.itemnumber,
        items.barcode,
        biblio.title,
        biblio.author,
        borrowers.borrowernumber,
        biblio.biblionumber,
        borrowers.branchcode,
        items.itemcallnumber,
        items.replacementprice
      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;
    $strsth.=" AND biblioitems.itemtype   = '" . $itemtypefilter . "' " if $itemtypefilter;
    $strsth.=" AND borrowers.flags        = '" . $borflagsfilter . "' " if $borflagsfilter;
    $strsth.=" AND borrowers.branchcode   = '" . $branchfilter   . "' " if $branchfilter;
    # 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" or $order eq "borrower desc") ? "$order, date_due"                 : 
        ($order eq "title"    or $order eq    "title desc") ? "$order, date_due, borrower"       :
        ($order eq "barcode"  or $order eq  "barcode desc") ? "items.$order, date_due, borrower" :
                                ($order eq "date_due desc") ? "date_due DESC, borrower"          :
                                                            "date_due, borrower"  # default sort order
    );
    $template->param(sql=>$strsth);
    my $sth=$dbh->prepare($strsth);
    #warn "overdue.pl : query string ".$strsth;
    $sth->execute();

    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) };
        }

        push @overduedata, {
            duedate                => format_date($data->{date_due}),
            borrowernumber         => $data->{borrowernumber},
            barcode                => $data->{barcode},
            itemnum                => $data->{itemnumber},
            name                   => $data->{borrower},
            phone                  => $data->{phone},
            email                  => $data->{email},
            biblionumber           => $data->{biblionumber},
            title                  => $data->{title},
            author                 => $data->{author},
            branchcode             => $data->{branchcode},
            itemcallnumber         => $data->{itemcallnumber},
            replacementprice       => $data->{replacementprice},
            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, ":utf8");
        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        => $csv_param_string,
        todaysdate              => format_date($todaysdate),
        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 = grep { $_ ne 'patron_attr_value_loop' } sort keys %{ $overdues->[0] };
    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";
}