#!/usr/bin/perl

use Modern::Perl;

use CGI qw ( -utf8 );
use Graphics::Magick;

use C4::Context;
use C4::Auth qw( get_template_and_user );
use C4::Output qw( output_html_with_http_headers );
use C4::Creators qw( html_table );
use C4::Patroncards qw( get_image put_image rm_image );

my $cgi = CGI->new;

my ($template, $loggedinuser, $cookie) = get_template_and_user({
                    template_name       => "patroncards/image-manage.tt",
                    query               => $cgi,
                    type                => "intranet",
                    flagsrequired       => {tools => 'label_creator'},
                    });

my $file_name = $cgi->param('uploadfile') || '';
my $image_name = $cgi->param('image_name') || $file_name;
my $upload_file = $cgi->upload('uploadfile') || '';
my $op = $cgi->param('op') || 'none';
my @image_ids = $cgi->multi_param('image_id');

my $source_file = "$file_name"; # otherwise we end up with what amounts to a pointer to a filehandle rather than a user-friendly filename

my $display_columns = { image =>    [  #{db column      => {label => 'col label', is link?          }},
                                        {image_id       => {label => 'ID',      link_field      => 0}},
                                        {image_name     => {label => 'Name',    link_field      => 0}},
                                        {_delete        => {label => 'Delete', link_field => 0}},
                                        {select         => {label => 'Select',  value           => 'image_id'}},
                                    ],
};
my $table = html_table($display_columns->{'image'}, get_image(undef, "image_id, image_name"));

my $image_limit = C4::Context->preference('ImageLimit') || '';
my $errstr = '';        # NOTE: For error codes see error-messages.inc

if ($op eq 'upload') {
    # Checking for duplicate image name
    my $dbh = C4::Context->dbh;
    my $query = "SELECT COUNT(*) FROM creator_images WHERE image_name=?";
    my ( $exists ) = $dbh->selectrow_array( $query, undef, $image_name );
    if ( $exists ) {
        $errstr = 304;
        $template->param(
            IMPORT_SUCCESSFUL => 0,
            SOURCE_FILE => $source_file,
            IMAGE_NAME => $image_name,
            TABLE => $table,
            error => $errstr,
        );
    } else {
        if (!$upload_file) {
            warn sprintf('An error occurred while attempting to upload file %s.', $source_file);
            $errstr = 301;
            $template->param(
                IMPORT_SUCCESSFUL => 0,
                SOURCE_FILE => $source_file,
                IMAGE_NAME => $image_name,
                TABLE => $table,
                error => $errstr,
            );
        }
        else {
            my $image = Graphics::Magick->new;
            eval{$image->Read($cgi->tmpFileName($file_name));};
            if ($@) {
                warn sprintf('An error occurred while creating the image object: %s',$@);
                $errstr = 202;
                $template->param(
                    IMPORT_SUCCESSFUL => 0,
                    SOURCE_FILE => $source_file,
                    IMAGE_NAME => $image_name,
                    TABLE => $table,
                    error => $errstr,
                );
            }
            else {
                my $errstr = '';
                my $size = $image->Get('filesize');
                $errstr =  302 if $size > 500000;
                $image->Set(magick => 'png'); # convert all images to png as this is a lossless format which is important for resizing operations later on
                my $err = put_image($image_name, $image->ImageToBlob()) || '0';
                $errstr = 101 if $err == 1;
                $errstr = 303 if $err == 202;
                if ($errstr) {
                    $template->param(
                        IMPORT_SUCCESSFUL => 0,
                        SOURCE_FILE => $source_file,
                        IMAGE_NAME => $image_name,
                        TABLE => $table,
                        error => $errstr,
                        image_limit => $image_limit,
                    );
                }
                else {
                    $table = html_table($display_columns->{'image'}, get_image(undef, "image_id, image_name"));  # refresh table data after successfully performing save operation
                    $template->param(
                        IMPORT_SUCCESSFUL => 1,
                        SOURCE_FILE => $source_file,
                        IMAGE_NAME => $image_name,
                        TABLE => $table,
                    );
                }
            }
        }
    }
}
elsif ($op eq 'delete') {
    my $err = '';
    my $errstr = '';
    if (@image_ids) {
        $err = rm_image(\@image_ids);
        $errstr = 102 if $err;
    }
    else {
        warn sprintf('No image ids passed in to delete.');
        $errstr = 202;
    }
    if ($errstr) {
        $template->param(
            DELETE_SUCCESSFULL => 0,
            IMAGE_IDS => join(', ', @image_ids),
            TABLE => $table,
            error => $errstr,
            image_ids => join(',',@image_ids),
        );
    }
    else {
        $table = html_table($display_columns->{'image'}, get_image(undef, "image_id, image_name"));  # refresh table data after successfully performing delete operation
        $template->param(
            DELETE_SUCCESSFULL => 1,
            TABLE => $table,
        );
    }
}
elsif ($op eq 'none') {
    $template->param(
        IMPORT_SUCCESSFUL => 0,
        SOURCE_FILE => $source_file,
        IMAGE_NAME => $image_name,
        TABLE => $table,
    );
}
else { # to trap unsupported operations
    warn sprintf('Image upload interface called an unsupported operation: %s',$op);
    $errstr = 201;
    $template->param(
        IMPORT_SUCCESSFUL => 0,
        SOURCE_FILE => $source_file,
        IMAGE_NAME => $image_name,
        TABLE => $table,
        error => $errstr,
    );
}

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

__END__

=head1 NAME

image-upload.pl - Script for handling uploading of single images and importing them into the database.

=head1 SYNOPSIS

image-upload.pl

=head1 DESCRIPTION

This script is called and presents the user with an interface allowing him/her to upload a single image file. Files greater than 500K will be refused.

=head1 AUTHOR

Chris Nighswonger <cnighswonger AT foundations DOT edu>

=head1 COPYRIGHT

Copyright 2009 Foundations Bible College.

=head1 LICENSE

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>.

=head1 DISCLAIMER OF WARRANTY

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.

=cut