#!/usr/bin/perl

# Copyright 2016 Koha Development Team
#
# 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 CGI qw( -utf8 );
use C4::Auth;
use C4::Context;
use C4::Output;
use C4::Circulation;
use C4::Letters;
use Koha::Checkouts;
use Koha::Items;
use Koha::Patrons;

my $input = new CGI;

my ( $template, $borrowernumber, $cookie ) = get_template_and_user(
    {
        template_name   => "tools/preview_letter.tt",
        query           => $input,
        type            => "intranet",
        authnotrequired => 0,
        flagsrequired   => { tools => 'edit_notices' },
        debug           => 1,
    }
);

my @messages;
my $code         = $input->param('code');
my $content      = $input->param('content');
my $title        = $input->param('title');
my $is_html      = $input->param('is_html');
my $data_preview = $input->param('data_preview');

unless ( $data_preview ) {
    $template->param( messages => [{ code => 'no_data_for_preview', type => 'error' }]);
    output_html_with_http_headers $input, $cookie, $template->output;
    exit;
}

my $fake_letter = { content => $content, title => $title, is_html => $is_html };

my ( $tt_content, $fake_tt_letter );
if ( $content =~ m/[^\n]*<<.*>>[^\n]*/so ) {
    $tt_content = $content;

    my $table_mapping = {
        biblio                 => 'biblio',
        borrowers              => 'borrower',
        branches               => 'branch',
        items                  => 'item',
        opac_news              => 'news',
        aqorders               => 'orders',
        reserves               => 'hold',
        serial                 => 'serial',
        subscription           => 'subscription',
        suggestions            => 'suggestion',
        issues                 => 'checkout',
        old_issues             => 'old_checkout',
        overdues               => 'overdue',
        borrower_modifications => 'patron_modification',
    };

    # Today
    $tt_content =~ s#<<today>>#[% today| \$KohaDates with_hours => 1 %]#sg;


    for my $date_field ( qw(
            borrowers.dateofbirth
            borrowers.dateenrolled
            borrowers.dateexpiry
            borrowers.debarred
            items.dateaccessioned
            items.datelastborrowed
            items.datelastseen
            items.onloan
            serials.planneddate
            serials.publisheddate
            serials.claimdate
            reserves.reservedate
            reserves.waitingdate
            reserves.expirationdate
            suggestions.suggesteddate
            suggestions.manageddate
            suggestions.accepteddate
            suggestions.rejecteddate
            aqorders.entrydate
            aqorders.datereceived
            aqorders.datecancellationprinted
            aqorders.budgetdate
            aqorders.claimed_date
    ) ) {
        my ( $table, $field ) = split '\.', $date_field;
        my $new_field =
          exists $table_mapping->{$table}
          ? $table_mapping->{$table} . ".$field"
          : "$table.$field";
        $tt_content =~ s#<<$table\.$field>>#[% $new_field | \$KohaDates %]#sg;
        $tt_content =~ s#<<$table\.$field\s*|\s*dateonly>>#[% $new_field | \$KohaDates %]#sg;
    }

    for my $datetime_field ( qw(
            items.itemlost_on
            items.withdrawn_on
            issues.date_due
            issues.returndate
            issues.lastreneweddate
            issues.issuedate
            reserves.suspend_until
    ) ) {
        my ( $table, $field ) = split '\.', $datetime_field;
        my $new_field =
          exists $table_mapping->{$table}
          ? $table_mapping->{$table} . ".$field"
          : "$table.$field";
        $tt_content =~ s#<<$table\.$field>>#[% $new_field | \$KohaDates with_hours => 1 %]#sg;
        $tt_content =~ s#<<$table\.$field\s*|\s*dateonly>>#[% $new_field | \$KohaDates %]#sg;
    }



    while ( my ( $key, $value ) = each %$table_mapping ) {
        $tt_content =~ s|<<$key\.|<<$value.|sg;
    }

    $tt_content =~ s|<<|[% |sg;
    $tt_content =~ s|>>| %]|sg;
    $fake_tt_letter =
      { content => $tt_content, title => $title, is_html => $is_html };
}

my ( $rendered_message, $rendered_tt_message ) = (q||) x 2;
my $messages_are_similar;
my $letter_params = {};
if ( $code eq 'CHECKIN' ) {
    my $item = Koha::Items->find( { barcode => $data_preview } );
    my $checkout = Koha::Checkouts->find( { itemnumber => $item->itemnumber } );
    if ($checkout) {
        my $patron = Koha::Patrons->find( $checkout->borrowernumber );
        my $branchcode =
          C4::Circulation::_GetCircControlBranch( $item->unblessed,
            $patron->unblessed );
        $letter_params = {
            tables => {
                issues      => $item->itemnumber,
                items       => $item->itemnumber,
                biblio      => $item->biblionumber,
                biblioitems => $item->biblionumber,
                issues      => $patron->borrowernumber,
                branches    => $branchcode,
            }
        };
        push @messages, { code => 'not_checked_in_yet', type => 'message' };
    }
    else {
        push @messages, { code => 'no_checkout', type => 'alert' };
        $letter_params = {};
    }
}
elsif ( $code eq 'CHECKOUT' ) {
    my ( $barcode, $borrowernumber ) = split '\|', $data_preview;
    my $item = Koha::Items->find( { barcode => $barcode } );
    my $patron = Koha::Patrons->find( $borrowernumber );
    if ($item and $patron) {
        my $branchcode =
          C4::Circulation::_GetCircControlBranch( $item->unblessed,
            $patron->unblessed );
        $letter_params = {
            tables => {
                issues      => $item->itemnumber,
                items       => $item->itemnumber,
                biblio      => $item->biblionumber,
                biblioitems => $item->biblionumber,
                issues      => $patron->borrowernumber,
                branches    => $branchcode,
            }
        };
        push @messages, { code => 'not_checked_out_yet', type => 'message' };
    }
    else {
        push @messages, { code => 'no_item_or_no_patron', type => 'alert' };
        $letter_params = {};
    }
}
elsif ( $code eq 'HOLD_SLIP' ) {
    my ( $biblionumber, $borrowernumber ) = split '\|', $data_preview;
    my $hold = Koha::Holds->find( { borrowernumber => $borrowernumber, biblionumber => $biblionumber } );
    if ($hold) {
        $letter_params = {
            tables => {
                reserves    => $hold->unblessed,
                branches    => $hold->branchcode,
                borrowers   => $hold->borrowernumber,
                biblio      => $hold->biblionumber,
                biblioitems => $hold->biblionumber,
                items       => $hold->itemnumber,
            }
        };
    }
    else {
        push @messages, { code => 'no_hold', type => 'alert' };
        $letter_params = {};
    }
}
else {
    push @messages, { type => 'alert', code => 'preview_not_available', letter_code => $code, };
}

if ( %$letter_params ) {
    # FIXME Be case here GetPreparedLetter modify $fake_letter
    $rendered_message = C4::Letters::GetPreparedLetter(
        letter => $fake_letter,
        %$letter_params,
    );
    if ($tt_content) {
        $rendered_tt_message = C4::Letters::GetPreparedLetter(
            letter => $fake_tt_letter,
            %$letter_params,
        );
        $messages_are_similar =
          $rendered_message->{content} eq $rendered_tt_message->{content};
    }
}

$template->param(
    original_content     => $content,
    rendered_message     => $rendered_message,
    tt_content           => $tt_content,
    rendered_tt_message  => $rendered_tt_message,
    messages_are_similar => $messages_are_similar,
    messages             => \@messages,
);

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