#!/usr/bin/perl
#
# Copyright 2007 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 CGI      qw ( -utf8 );
use C4::Auth qw( get_template_and_user );
use C4::Context;
use C4::Output  qw( output_html_with_http_headers );
use C4::Matcher qw/valid_normalization_routines/;

our $input = CGI->new;
my $op = $input->param('op') || '';

my ( $template, $loggedinuser, $cookie ) = get_template_and_user(
    {
        template_name => "admin/matching-rules.tt",
        query         => $input,
        type          => "intranet",
        flagsrequired => { parameters => 'manage_matching_rules' },
    }
);

my $matcher_id = $input->param("matcher_id");

$template->param( max_matchpoint => 0 );
$template->param( max_matchcheck => 0 );
my @valid_norms = C4::Matcher::valid_normalization_routines();
unshift @valid_norms, 'none';
$template->param( valid_norms => \@valid_norms );

my $display_list = 0;
if ( $op eq "edit_matching_rule" ) {
    edit_matching_rule_form( $template, $matcher_id );
} elsif ( $op eq "cud-edit_matching_rule_confirmed" ) {
    add_update_matching_rule( $template, $matcher_id );
    $display_list = 1;
} elsif ( $op eq "add_matching_rule" ) {
    add_matching_rule_form($template);
} elsif ( $op eq "cud-add_matching_rule_confirmed" ) {
    add_update_matching_rule( $template, $matcher_id );
    $display_list = 1;
} elsif ( $op eq "delete_matching_rule" ) {
    delete_matching_rule_form( $template, $matcher_id );
} elsif ( $op eq "cud-delete_matching_rule_confirmed" ) {
    delete_matching_rule( $template, $matcher_id );
    $display_list = 1;
} else {
    $display_list = 1;
}

if ($display_list) {
    matching_rule_list($template);
}

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

exit 0;

sub add_matching_rule_form {
    my $template = shift;

    $template->param(
        matching_rule_form => 1,
        confirm_op         => 'cud-add_matching_rule_confirmed',
        max_matchpoint     => 1,
        max_matchcheck     => 1
    );

}

sub add_update_matching_rule {
    my $template    = shift;
    my $matcher_id  = shift;
    my $record_type = $input->param('record_type') || 'biblio';

    # do parsing
    my $matcher = C4::Matcher->new( $record_type, 1000 );
    $matcher->code( scalar $input->param('code') );
    $matcher->description( scalar $input->param('description') );
    $matcher->threshold( scalar $input->param('threshold') );

    # matchpoints
    my @mp_nums = sort map { /^mp_(\d+)_search_index/ ? int($1) : () } $input->multi_param;
    foreach my $mp_num (@mp_nums) {
        my $index = $input->param("mp_${mp_num}_search_index");
        my $score = $input->param("mp_${mp_num}_score");

        # components
        my $components = [];
        my @comp_nums  = sort map { /^mp_${mp_num}_c_(\d+)_tag/ ? int($1) : () } $input->multi_param;
        foreach my $comp_num (@comp_nums) {
            my $component = {};
            $component->{'tag'}       = $input->param("mp_${mp_num}_c_${comp_num}_tag");
            $component->{'subfields'} = $input->param("mp_${mp_num}_c_${comp_num}_subfields");
            $component->{'offset'}    = $input->param("mp_${mp_num}_c_${comp_num}_offset");
            $component->{'length'}    = $input->param("mp_${mp_num}_c_${comp_num}_length");

            # norms
            $component->{'norms'} = [];
            my @norm_nums = sort map { /^mp_${mp_num}_c_${comp_num}_n_(\d+)_norm/ ? int($1) : () } $input->multi_param;
            foreach my $norm_num (@norm_nums) {
                push @{ $component->{'norms'} }, $input->multi_param("mp_${mp_num}_c_${comp_num}_n_${norm_num}_norm");
            }
            push @$components, $component;
        }
        $matcher->add_matchpoint( $index, $score, $components );
    }

    # match checks
    my @mc_nums = sort map { /^mc_(\d+)_id/ ? int($1) : () } $input->multi_param;
    foreach my $mc_num (@mc_nums) {

        # source components
        my $src_components = [];
        my @src_comp_nums  = sort map { /^mc_${mc_num}_src_c_(\d+)_tag/ ? int($1) : () } $input->multi_param;
        foreach my $comp_num (@src_comp_nums) {
            my $component = {};
            $component->{'tag'}       = $input->param("mc_${mc_num}_src_c_${comp_num}_tag");
            $component->{'subfields'} = $input->param("mc_${mc_num}_src_c_${comp_num}_subfields");
            $component->{'offset'}    = $input->param("mc_${mc_num}_src_c_${comp_num}_offset");
            $component->{'length'}    = $input->param("mc_${mc_num}_src_c_${comp_num}_length");

            # norms
            $component->{'norms'} = [];
            my @norm_nums =
                sort map { /^mc_${mc_num}_src_c_${comp_num}_n_(\d+)_norm/ ? int($1) : () } $input->multi_param;
            foreach my $norm_num (@norm_nums) {
                push @{ $component->{'norms'} },
                    $input->multi_param("mc_${mc_num}_src_c_${comp_num}_n_${norm_num}_norm");
            }
            push @$src_components, $component;
        }

        # target components
        my $tgt_components = [];
        my @tgt_comp_nums  = sort map { /^mc_${mc_num}_tgt_c_(\d+)_tag/ ? int($1) : () } $input->multi_param;
        foreach my $comp_num (@tgt_comp_nums) {
            my $component = {};
            $component->{'tag'}       = $input->param("mc_${mc_num}_tgt_c_${comp_num}_tag");
            $component->{'subfields'} = $input->param("mc_${mc_num}_tgt_c_${comp_num}_subfields");
            $component->{'offset'}    = $input->param("mc_${mc_num}_tgt_c_${comp_num}_offset");
            $component->{'length'}    = $input->param("mc_${mc_num}_tgt_c_${comp_num}_length");

            # norms
            $component->{'norms'} = [];
            my @norm_nums =
                sort map { /^mc_${mc_num}_tgt_c_${comp_num}_n_(\d+)_norm/ ? int($1) : () } $input->multi_param;
            foreach my $norm_num (@norm_nums) {
                push @{ $component->{'norms'} },
                    $input->multi_param("mc_${mc_num}_tgt_c_${comp_num}_n_${norm_num}_norm");
            }
            push @$tgt_components, $component;
        }
        $matcher->add_required_check( $src_components, $tgt_components );
    }

    if ( defined $matcher_id and $matcher_id =~ /^\d+/ ) {
        $matcher->_id($matcher_id);
        $template->param( edited_matching_rule => $matcher->code() );
    } else {
        $template->param( added_matching_rule => $matcher->code() );
    }
    $matcher_id = $matcher->store();
}

sub delete_matching_rule_form {
    my $template   = shift;
    my $matcher_id = shift;

    my $matcher = C4::Matcher->fetch($matcher_id);
    $template->param(
        delete_matching_rule_form => 1,
        confirm_op                => "cud-delete_matching_rule_confirmed",
        matcher_id                => $matcher_id,
        code                      => $matcher->code(),
        description               => $matcher->description(),
    );
}

sub delete_matching_rule {
    my $template   = shift;
    my $matcher_id = shift;

    my $matcher = C4::Matcher->fetch($matcher_id);
    $template->param(
        deleted_matching_rule => $matcher->code(),
    );
    C4::Matcher->delete($matcher_id);
}

sub edit_matching_rule_form {
    my $template   = shift;
    my $matcher_id = shift;

    my $matcher = C4::Matcher->fetch($matcher_id);

    $template->{VARS}->{'matcher_id'}  = $matcher_id;
    $template->{VARS}->{'code'}        = $matcher->code();
    $template->{VARS}->{'description'} = $matcher->description();
    $template->{VARS}->{'threshold'}   = $matcher->threshold();
    $template->{VARS}->{'record_type'} = $matcher->record_type();

    my $matcher_info = $matcher->dump();
    my @matchpoints  = ();
    my $mp_num       = 0;
    foreach my $matchpoint ( @{ $matcher_info->{'matchpoints'} } ) {
        $mp_num++;
        my @components = _parse_components( $matchpoint->{'components'} );
        push @matchpoints, {
            mp_num     => $mp_num,
            index      => $matchpoint->{'index'},
            score      => $matchpoint->{'score'},
            components => \@components
        };
    }
    $template->param( matchpoints => \@matchpoints );

    my $mc_num      = 0;
    my @matchchecks = ();
    foreach my $matchcheck ( @{ $matcher_info->{'matchchecks'} } ) {
        $mc_num++;
        my @src_components = _parse_components( $matchcheck->{'source_matchpoint'}->{'components'} );
        my @tgt_components = _parse_components( $matchcheck->{'target_matchpoint'}->{'components'} );
        push @matchchecks, {
            mc_num         => $mc_num,
            src_components => \@src_components,
            tgt_components => \@tgt_components
        };
    }
    $template->param( matchchecks => \@matchchecks );

    $template->param(
        matching_rule_form => 1,
        edit_matching_rule => 1,
        confirm_op         => 'cud-edit_matching_rule_confirmed',
        max_matchpoint     => $mp_num,
        max_matchcheck     => $mc_num
    );

}

sub _parse_components {
    my $components_ref = shift;
    my @components     = ();

    my $comp_num = 0;
    foreach my $component ( @{$components_ref} ) {
        $comp_num++;
        my $norm_num = 0;
        my @norms;
        foreach my $norm ( @{ $component->{'norms'} } ) {
            $norm_num++;
            push @norms, { norm_num => $norm_num, norm => $norm };
        }
        push @components, {
            comp_num  => $comp_num,
            tag       => $component->{'tag'},
            subfields => join( "", sort keys %{ $component->{'subfields'} } ),
            offset    => $component->{'offset'},
            'length'  => $component->{'length'},
            norms     => \@norms
        };
    }

    return @components;
}

sub matching_rule_list {
    my $template = shift;

    my @matching_rules = C4::Matcher::GetMatcherList();
    $template->param( available_matching_rules => \@matching_rules );
    $template->param( display_list             => 1 );
}