#!/usr/bin/perl

# This software is placed under the gnu General Public License, v2 (http://www.gnu.org/licenses/gpl.html)

# Copyright 2008 LibLime
#
# 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 POSIX qw( ceil );
use CGI qw ( -utf8 );
use CGI::Cookie;     # need to check cookies before having CGI parse the POST request
use URI::Escape qw( uri_escape_utf8 );
use C4::Auth qw( check_cookie_auth get_template_and_user );
use C4::Context;
use C4::Output qw( output_with_http_headers is_ajax pagination_bar output_html_with_http_headers );
use C4::Tags qw(
    approval_counts
    blacklist
    get_approval_rows
    is_approved
    whitelist
);

my $script_name = "/cgi-bin/koha/tags/review.pl";
my $needed_flags = { tools => 'moderate_tags' };    # FIXME: replace when more specific permission is created.

sub ajax_auth_cgi { # returns CGI object
    my $needed_flags = shift;
    my %cookies = CGI::Cookie->fetch;
    my $input = CGI->new;
    my $sessid = $cookies{'CGISESSID'}->value;
    my ($auth_status) = check_cookie_auth($sessid, $needed_flags);
    if ($auth_status ne "ok") {
        output_with_http_headers $input, undef,
            "window.alert('Your CGI session cookie ($sessid) is not current.  " .
            "Please refresh the page and try again.');\n", 'js';
        exit 0;
    }
    return $input;
}

if (is_ajax()) {
    my $input = &ajax_auth_cgi($needed_flags);
    my $operator = C4::Context->userenv->{'number'};  # must occur AFTER auth
    my ($tag, $js_reply);
    if ($tag = $input->param('test')) {
        my $check = is_approved($tag);
        $js_reply = ( $check >=  1 ? 'success' : $check <= -1 ? 'failure' : 'indeterminate' ) . "_test('".uri_escape_utf8($tag)."');\n";
    }
    if ($tag = $input->param('ok')) {
        $js_reply = (   whitelist($operator,$tag) ? 'success' : 'failure') . "_approve('".uri_escape_utf8($tag)."');\n";
    }
    if ($tag = $input->param('rej')) {
        $js_reply = (   blacklist($operator,$tag) ? 'success' : 'failure')  . "_reject('".uri_escape_utf8($tag)."');\n";
    }
    output_with_http_headers $input, undef, $js_reply, 'js';
    exit;
}

### Below is the sad, boring, necessary non-AJAX HTML code.

my $input = CGI->new;
my ($template, $borrowernumber, $cookie) = get_template_and_user(
    {
        template_name   => "tags/review.tt",
        query           => $input,
        type            => "intranet",
        flagsrequired   => $needed_flags,
    }
);

my ($op, @errors, @tags);

foreach (qw( approve reject test )) {
    $op = $_ if ( $input->param("op-$_") );
}
$op ||= 'none';

@tags = $input->multi_param('tags');

$borrowernumber == 0 and push @errors, {op_zero=>1};
if ($op eq 'approve') {
    foreach (@tags) {
        whitelist($borrowernumber,$_) or push @errors, {failed_ok=>$_};
    }
} elsif ($op eq 'reject' ) {
    foreach (@tags) {
         blacklist($borrowernumber,$_) or push @errors, {failed_rej=>$_};
    }
} elsif ($op eq 'test'   ) {
    my $tag = $input->param('test');
    push @tags, $tag;
    my $check = is_approved($tag);
    $template->param(
        test_term => $tag,
        ( $check >=  1 ? 'verdict_ok' :
          $check <= -1 ? 'verdict_rej' : 'verdict_indeterminate' ) => 1,
     );
}

my $counts = &approval_counts;
foreach (keys %$counts) {
    $template->param($_ => $counts->{$_});
}

sub pagination_calc {
    my $query = shift or return;
    my $hardlimit = (@_) ? shift : 100;     # hardcoded, could be another syspref
    my $pagesize = $query->param('limit' ) || $hardlimit;
    my $page     = $query->param('page'  ) || 1;
    my $offset   = $query->param('offset') || 0;
    ($pagesize <= $hardlimit) or $pagesize = $hardlimit;
    if ($page > 1) {
        $offset = ($page-1)*$pagesize;
    } else {
        $page = 1;
    }
    return ($pagesize,$page,$offset);
}

my ($pagesize,$page,$offset) = pagination_calc($input,100);

my %filters = (
    limit => $offset ? "$offset,$pagesize" : $pagesize,
     sort => 'approved,-weight_total,+term',
);
my ($filter,$date_from,$date_to);
if (defined $input->param('approved')) { # 0 is valid value, must check defined
    $filter = $input->param('approved');
} else {
    $filter = 0;
}
if ($filter eq 'all') {
    $template->param(filter_approved_all => 1);
} elsif ($filter =~ /-?[01]/) {
    $filters{approved} = $filter;
    $template->param(
        ($filter == 1  ? 'filter_approved_ok'      :
         $filter == 0  ? 'filter_approved_pending' :
         $filter == -1 ? 'filter_approved_rej'     :
        'filter_approved') => 1
    );
}

# my $q_count = get_approval_rows({limit=>$pagesize, sort=>'approved,-weight_total,+term', count=>1});
if ($filter = $input->param('tag')) {
    $template->param(filter_tag=>$filter);
    $filters{term} = $filter;
}
if ( $filter = $input->param('from') ) {
    $date_from = $filter;
    $template->param( filter_date_approved_from => $filter );
    $filters{date_approved} = ">=$date_from";
}
if ( $filter = $input->param('to') ) {
    $date_to = $filter;
    $template->param( filter_date_approved_to => $filter );
    $filters{date_approved} = "<=$date_to";
}
if ($filter = $input->param('approver')) {      # name (or borrowernumber) from input box
    if ($filter =~ /^\d+$/ and $filter > 0) {
        # $filter=get borrowernumber from name
        # FIXME: get borrowernumber from name not implemented.
        $template->param(filter_approver=>$filter);
        $filters{approved_by} = $filter;
    } else {
        push @errors, {approver=>$filter};
    }
}
if ($filter = $input->param('approved_by')) {   # borrowernumber from link
    if ($filter =~ /^\d+$/ and $filter > 0) {
        $template->param(filter_approver=>$filter);
        $filters{approved_by} = $filter;
    } else {
        push @errors, {approved_by=>$filter};
    }
}
my $tagloop = get_approval_rows(\%filters);
my $qstring = $input->query_string;
$qstring =~ s/([&;])*\blimit=\d+//;         # remove pagination var
$qstring =~ s/^;+//;                        # remove leading delims
$qstring = "limit=$pagesize" . ($qstring ? '&amp;' . $qstring : '');
(scalar @errors) and $template->param(message_loop=>\@errors);
$template->param(
    offset => $offset,  # req'd for EXPR
    op => $op,
    op_count => scalar(@tags),
    script_name => $script_name,
    approved => 0,      # dummy value (also EXPR)
    tagloop => $tagloop,
    pagination_bar => pagination_bar(
        "$script_name?$qstring\&amp;",
        ceil($counts->{approved_total}/$pagesize),  # $page, 'page'
    )
);

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

=head1 AUTHOR

Joe Atzberger
atz AT liblime.com

=cut