package C4::Output;

#package to deal with marking up output
#You will need to edit parts of this pm
#set the value of path to be where your html lives

# 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 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>.


# NOTE: I'm pretty sure this module is deprecated in favor of
# templates.

use Modern::Perl;

use URI::Escape;
use Scalar::Util qw( looks_like_number );

use C4::Auth qw(get_template_and_user);
use C4::Context;
use C4::Templates;

use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS);

BEGIN {
    require Exporter;

 @ISA    = qw(Exporter);
    @EXPORT_OK = qw(&is_ajax ajax_fail); # More stuff should go here instead
    %EXPORT_TAGS = ( all =>[qw(setlanguagecookie pagination_bar parametrized_url
                                &output_with_http_headers &output_ajax_with_http_headers &output_html_with_http_headers)],
                    ajax =>[qw(&output_with_http_headers &output_ajax_with_http_headers is_ajax)],
                    html =>[qw(&output_with_http_headers &output_html_with_http_headers)]
                );
    push @EXPORT, qw(
        setlanguagecookie getlanguagecookie pagination_bar parametrized_url
    );
    push @EXPORT, qw(
        &output_html_with_http_headers &output_ajax_with_http_headers &output_with_http_headers
        &output_and_exit_if_error &output_and_exit &output_error
    );

}

=head1 NAME

C4::Output - Functions for managing output, is slowly being deprecated

=head1 FUNCTIONS

=over 2

=item pagination_bar

   pagination_bar($base_url, $nb_pages, $current_page, $startfrom_name)

Build an HTML pagination bar based on the number of page to display, the
current page and the url to give to each page link.

C<$base_url> is the URL for each page link. The
C<$startfrom_name>=page_number is added at the end of the each URL.

C<$nb_pages> is the total number of pages available.

C<$current_page> is the current page number. This page number won't become a
link.

This function returns HTML, without any language dependency.

=cut

sub pagination_bar {
    my $base_url = (@_ ? shift : return);
    my $nb_pages       = (@_) ? shift : 1;
    my $current_page   = (@_) ? shift : undef;	# delay default until later
    my $startfrom_name = (@_) ? shift : 'page';
    my $additional_parameters = shift || {};

    $current_page = looks_like_number($current_page) ? $current_page : undef;
    $nb_pages     = looks_like_number($nb_pages)     ? $nb_pages     : undef;

    # how many pages to show before and after the current page?
    my $pages_around = 2;

	my $delim = qr/\&(?:amp;)?|;/;		# "non memory" cluster: no backreference
	$base_url =~ s/$delim*\b$startfrom_name=(\d+)//g; # remove previous pagination var
    unless (defined $current_page and $current_page > 0 and $current_page <= $nb_pages) {
        $current_page = ($1) ? $1 : 1;	# pull current page from param in URL, else default to 1
		# $debug and	# FIXME: use C4::Debug;
		# warn "with QUERY_STRING:" .$ENV{QUERY_STRING}. "\ncurrent_page:$current_page\n1:$1  2:$2  3:$3";
    }
	$base_url =~ s/($delim)+/$1/g;	# compress duplicate delims
	$base_url =~ s/$delim;//g;		# remove empties
	$base_url =~ s/$delim$//;		# remove trailing delim

    my $url = $base_url . (($base_url =~ m/$delim/ or $base_url =~ m/\?/) ? '&amp;' : '?' ) . $startfrom_name . '=';
    my $url_suffix;
    while ( my ( $k, $v ) = each %$additional_parameters ) {
        $url_suffix .= '&amp;' . URI::Escape::uri_escape_utf8($k) . '=' . URI::Escape::uri_escape_utf8($v);
    }
    my $pagination_bar = '';

    # navigation bar useful only if more than one page to display !
    if ( $nb_pages > 1 ) {

        # link to first page?
        if ( $current_page > 1 ) {
            $pagination_bar .=
                "\n" . '&nbsp;'
              . '<a href="'
              . $url
              . '1'
              . $url_suffix
              . '"rel="start">'
              . '&lt;&lt;' . '</a>';
        }
        else {
            $pagination_bar .=
              "\n" . '&nbsp;<span class="inactive">&lt;&lt;</span>';
        }

        # link on previous page ?
        if ( $current_page > 1 ) {
            my $previous = $current_page - 1;

            $pagination_bar .=
                "\n" . '&nbsp;'
              . '<a href="'
              . $url
              . $previous
              . $url_suffix
              . '" rel="prev">' . '&lt;' . '</a>';
        }
        else {
            $pagination_bar .=
              "\n" . '&nbsp;<span class="inactive">&lt;</span>';
        }

        my $min_to_display      = $current_page - $pages_around;
        my $max_to_display      = $current_page + $pages_around;
        my $last_displayed_page = undef;

        for my $page_number ( 1 .. $nb_pages ) {
            if (
                   $page_number == 1
                or $page_number == $nb_pages
                or (    $page_number >= $min_to_display
                    and $page_number <= $max_to_display )
              )
            {
                if ( defined $last_displayed_page
                    and $last_displayed_page != $page_number - 1 )
                {
                    $pagination_bar .=
                      "\n" . '&nbsp;<span class="inactive">...</span>';
                }

                if ( $page_number == $current_page ) {
                    $pagination_bar .=
                        "\n" . '&nbsp;'
                      . '<span class="currentPage">'
                      . $page_number
                      . '</span>';
                }
                else {
                    $pagination_bar .=
                        "\n" . '&nbsp;'
                      . '<a href="'
                      . $url
                      . $page_number
                      . $url_suffix
                      . '">'
                      . $page_number . '</a>';
                }
                $last_displayed_page = $page_number;
            }
        }

        # link on next page?
        if ( $current_page < $nb_pages ) {
            my $next = $current_page + 1;

            $pagination_bar .= "\n"
              . '&nbsp;<a href="'
              . $url
              . $next
              . $url_suffix
              . '" rel="next">' . '&gt;' . '</a>';
        }
        else {
            $pagination_bar .=
              "\n" . '&nbsp;<span class="inactive">&gt;</span>';
        }

        # link to last page?
        if ( $current_page != $nb_pages ) {
            $pagination_bar .= "\n"
              . '&nbsp;<a href="'
              . $url
              . $nb_pages
              . $url_suffix
              . '" rel="last">'
              . '&gt;&gt;' . '</a>';
        }
        else {
            $pagination_bar .=
              "\n" . '&nbsp;<span class="inactive">&gt;&gt;</span>';
        }
    }

    return $pagination_bar;
}

=item output_with_http_headers

   &output_with_http_headers($query, $cookie, $data, $content_type[, $status[, $extra_options]])

Outputs $data with the appropriate HTTP headers,
the authentication cookie $cookie and a Content-Type specified in
$content_type.

If applicable, $cookie can be undef, and it will not be sent.

$content_type is one of the following: 'html', 'js', 'json', 'xml', 'rss', or 'atom'.

$status is an HTTP status message, like '403 Authentication Required'. It defaults to '200 OK'.

$extra_options is hashref.  If the key 'force_no_caching' is present and has
a true value, the HTTP headers include directives to force there to be no
caching whatsoever.

=cut

sub output_with_http_headers {
    my ( $query, $cookie, $data, $content_type, $status, $extra_options ) = @_;
    $status ||= '200 OK';

    $extra_options //= {};

    my %content_type_map = (
        'html' => 'text/html',
        'js'   => 'text/javascript',
        'json' => 'application/json',
        'xml'  => 'text/xml',
        # NOTE: not using application/atom+xml or application/rss+xml because of
        # Internet Explorer 6; see bug 2078.
        'rss'  => 'text/xml',
        'atom' => 'text/xml'
    );

    die "Unknown content type '$content_type'" if ( !defined( $content_type_map{$content_type} ) );
    my $cache_policy = 'no-cache';
    $cache_policy .= ', no-store, max-age=0' if $extra_options->{force_no_caching};
    my $options = {
        type              => $content_type_map{$content_type},
        status            => $status,
        charset           => 'UTF-8',
        Pragma            => 'no-cache',
        'Cache-Control'   => $cache_policy,
        'X-Frame-Options' => 'SAMEORIGIN',
    };
    $options->{expires} = 'now' if $extra_options->{force_no_caching};

    $options->{cookie} = $cookie if $cookie;
    if ($content_type eq 'html') {  # guaranteed to be one of the content_type_map keys, else we'd have died
        $options->{'Content-Style-Type' } = 'text/css';
        $options->{'Content-Script-Type'} = 'text/javascript';
    }

# We can't encode here, that will double encode our templates, and xslt
# We need to fix the encoding as it comes out of the database, or when we pass the variables to templates

    $data =~ s/\&amp\;amp\; /\&amp\; /g;
    print $query->header($options), $data;
}

sub output_html_with_http_headers {
    my ( $query, $cookie, $data, $status, $extra_options ) = @_;
    output_with_http_headers( $query, $cookie, $data, 'html', $status, $extra_options );
}


sub output_ajax_with_http_headers {
    my ( $query, $js ) = @_;
    print $query->header(
        -type            => 'text/javascript',
        -charset         => 'UTF-8',
        -Pragma          => 'no-cache',
        -'Cache-Control' => 'no-cache',
        -expires         => '-1d',
    ), $js;
}

sub is_ajax {
    my $x_req = $ENV{HTTP_X_REQUESTED_WITH};
    return ( $x_req and $x_req =~ /XMLHttpRequest/i ) ? 1 : 0;
}

=item output_and_exit_if_error

    output_and_exit_if_error( $query, $cookie, $template, $params );

To executed at the beginning of scripts to stop the script at this point if
some errors are found.

Tests for module 'members':
* patron is not defined (we are looking for a patron that does no longer exist/never existed)
* The logged in user cannot see patron's infos (feature 'cannot_see_patron_infos')

Others will be added here depending on the needs (for instance biblio does not exist will be useful).

=cut

sub output_and_exit_if_error {
    my ( $query, $cookie, $template, $params ) = @_;
    my $error;
    if ( $params and exists $params->{module} ) {
        if ( $params->{module} eq 'members' ) {
            my $logged_in_user = $params->{logged_in_user};
            my $current_patron = $params->{current_patron};
            if ( not $current_patron ) {
                $error = 'unknown_patron';
            }
            elsif( not $logged_in_user->can_see_patron_infos( $current_patron ) ) {
                $error = 'cannot_see_patron_infos';
            }
        } elsif ( $params->{module} eq 'cataloguing' ) {
            # We are testing the record to avoid additem to fetch the Koha::Biblio
            # But in the long term we will want to get a biblio in parameter
            $error = 'unknown_biblio' unless $params->{record};
        }
    }

    output_and_exit( $query, $cookie, $template, $error ) if $error;
    return;
}

=item output_and_exit

    output_and_exit( $query, $cookie, $template, $error );

    $error is a blocking error like biblionumber not found or so.
    We should output the error and exit.

=cut

sub output_and_exit {
    my ( $query, $cookie, $template, $error ) = @_;
    $template->param( blocking_error => $error );
    output_html_with_http_headers ( $query, $cookie, $template->output );
    exit;
}

sub output_error {
    my ( $query, $error ) = @_;
    my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
        {
            template_name   => 'errors/errorpage.tt',
            query           => $query,
            type            => 'intranet',
            authnotrequired => 1,
        }
    );
    my $admin = C4::Context->preference('KohaAdminEmailAddress');
    $template->param (
        admin => $admin,
        errno => $error,
    );
    output_with_http_headers $query, $cookie, $template->output, 'html', '404 Not Found';
}

sub parametrized_url {
    my $url = shift || ''; # ie page.pl?ln={LANG}
    my $vars = shift || {}; # ie { LANG => en }
    my $ret = $url;
    while ( my ($key,$val) = each %$vars) {
        my $val_url = URI::Escape::uri_escape_utf8( $val // q{} );
        $ret =~ s/\{$key\}/$val_url/g;
    }
    $ret =~ s/\{[^\{]*\}//g; # remove remaining vars
    return $ret;
}

END { }    # module clean-up code here (global destructor)

1;
__END__

=back

=head1 AUTHOR

Koha Development Team <http://koha-community.org/>

=cut