#!/usr/bin/env perl

use strict;
use warnings;
use autodie;

use constant {
    SEARCH  => 0,
    REPLACE => 2,
};

use File::Copy;
use List::Util 'uniq';
use IO::Prompter [
    -single,
    -style => 'bold blue',
    -echostyle => 'bold magenta',
];
use Term::ANSIColor;
use Text::CSV;

# For testing:
BEGIN {
    copy('whitelist_sr_original.txt', 'whitelist_sr.txt');
}

my $csv_file = 'whitelist_sr.csv';
my $source_file = 'whitelist_sr_src.txt';
my $text_file = 'whitelist_sr.txt';
copy($text_file, $source_file);

my ($sr, $re) = _process_csv($csv_file);
_process_text($source_file, $text_file, $sr, $re);
unlink $source_file;

sub _process_text {
    my ($source_file, $text_file, $sr, $re) = @_;

    open my $src_fh, '<', $source_file;
    open my $txt_fh, '>', $text_file;

    while (my $line = <$src_fh>) {
        while ($line =~ /$re/g) {
            my $frag = $1;
            $line =~ s/$frag/_replace($line, $frag, $sr, $re)/e;
        }
        print $txt_fh $line;
    }

    return;
}

sub _replace {
    my ($line, $frag, $sr, $re) = @_;

    my $replace;

    if (@{$sr->{$frag}} == 1) {
        $replace = $sr->{$frag}[0];
    }
    else {
        $line =~ /$re/;
        $line = colored(substr($line, 0, $-[0]), 'dark yellow')
              . colored($1, 'bold yellow')
              . colored(substr($line, $+[0]), 'dark yellow');
        print colored("Current line:", 'bold white'), ' ', $line;
        my $index = prompt "Replace '$frag' with:",
               -number,
               -menu => {
                   map +($sr->{$frag}[$_] => $_), 0 .. $#{$sr->{$frag}}
               },
               '> ';
        $replace = $sr->{$frag}[$index];
    }

    return $replace;
}

sub _process_csv {
    my ($csv_file) = @_;

    my $sr = {};
    my $csv = Text::CSV::->new();
    open my $fh, '<', $csv_file;

    while (my $row = $csv->getline($fh)) {
        push @{$sr->{$row->[SEARCH]}}, $row->[REPLACE];
    }

    $sr->{$_} = [ uniq @{$sr->{$_}} ] for keys %$sr;

    my $alt = join '|', map "\Q$_", sort {
        length $b <=> length $a
    } keys %$sr;
    my $re = qr{\b($alt)\b};

    return ($sr, $re);
}

##</code><code>##

$ cat whitelist_sr.csv
whitelist entries,Noun,access list entries
IP whitelist,Noun,IP access list
IP whitelist entries,Noun,IP access list entries
whitelist,Adjective,allow
whitelist,Noun,access list
whitelist,Noun,access-list
whitelist,Verb,allow
your whitelist,Noun,your access list
your whitelist,Noun,my permission list
your whitelist,Noun,thy permission list
your whitelist,Noun,his permission list
your whitelist,Noun,her permission list
your whitelist,Noun,its permission list
your whitelist,Noun,our permission list
your whitelist,Noun,your permission list
your whitelist,Noun,their permission list
Verb,Noun,action
Verb,,action

##</code><code>##

$ cat whitelist_sr_original.txt
whitelist entries,Noun,access list entries
IP whitelist,Noun,IP access list
IP whitelist entries,Noun,IP access list entries
whitelist,Adjective,allow
whitelist,Noun,access list
whitelist,Noun,access-list
whitelist,Verb,allow
your whitelist,Noun,your access list
your whitelist,Noun,my permission list
your whitelist,Noun,thy permission list
your whitelist,Noun,his permission list
your whitelist,Noun,her permission list
your whitelist,Noun,its permission list
your whitelist,Noun,our permission list
your whitelist,Noun,your permission list
your whitelist,Noun,their permission list

IP whitelist IP whitelist entries IP whitelist
IP whitelistIP whitelist entriesIP whitelist
whitelist whitelist whitelist whitelist
whitelistwhitelistwhitelistwhitelist
IP whitelist whitelist entries whitelist
IPwhitelistwhitelistentrieswhitelist

IP whitelist your whitelist whitelist
IP whitelistyour whitelistwhitelist
IPwhitelist yourwhitelist whitelist

##</code><code>##

$ cat whitelist_sr.txt
access list entries,Noun,access list entries
IP access list,Noun,IP access list
IP access list entries,Noun,IP access list entries
access list,Adjective,allow
access-list,Noun,access list
allow,Noun,access-list
access list,action,allow
your permission list,Noun,your access list
your access list,Noun,my permission list
thy permission list,Noun,thy permission list
their permission list,Noun,his permission list
our permission list,Noun,her permission list
my permission list,Noun,its permission list
its permission list,Noun,our permission list
his permission list,Noun,your permission list
her permission list,Noun,their permission list

IP access list IP access list entries IP access list
IP access-listIP allow entriesIP access list
access-list allow access list access-list
whitelistwhitelistwhitelistwhitelist
IP access list access list entries allow
IPwhitelistwhitelistentrieswhitelist

IP access list thy permission list access list
IP whitelistyour whitelistwhitelist
IPaccess-list yourallow access list