#!/usr/bin/env perl

use v5.36;

use List::Util 'max';

my %price = (
    'Coca Cola'   =>  1.25,
    coke          =>  1.25,
    COLA          =>  1.25,
    Cola          =>  1.25,
    cola          =>  1.25,
    'Pepsi Cola'  =>  1.25,
    pizza         => 12.00,
    sandwich      =>  3.00,
    'UNDEAD COLA' => undef,
    'Undead Cola' => undef,
    'Undead cola' => undef,
    'undead cola' => undef,
);

say 'Enter whole or partial name for key (just hit Return to exit).';

while (1) {
    print "\nName: ";
    my $name = <STDIN>;
    chomp $name;

    unless (length $name) {
        say 'Exiting ...';
        last;
    }

    unless ($name =~ /^[A-Za-z0-9 ]+$/) {
        say 'Only alphanumeric+space name searches allowed.';
        next;
    }

    check_keys(\%price, $name);
}

sub check_keys ($hash, $name) {
    my %matches = map +($_ => 1), grep /$name/i, keys %$hash;

    if (keys %matches) {
        _printf_head($hash);

        if (exists $matches{$name}) {
            _printf($hash, 'EXACT', $name);
            delete $matches{$name};
        }
    }
    else {
        say "No keys match '$name'.";
        return;
    }

    for (grep /^$name$/i, sort keys %matches) {
        _printf($hash, 'NO_CASE', $_);
        delete $matches{$_};
    }

    for (sort keys %matches) {
        _printf($hash, 'PARTIAL', $_);
    }

    return;
}

sub _printf ($hash, $match, $key) {
    my $fmt = "%-7s %-@{[max map length, keys %$hash]}s ";
    $fmt .= defined $hash->{$key} ? "%.2f\n" : "%s\n";
    printf $fmt, $match, $key, $hash->{$key} // '<undefined>';
    return;
}

sub _printf_head ($hash) {
    my $fmt = "%-7s %-@{[max map length, keys %$hash]}s %s\n";
    printf $fmt, qw{Match Key Value};
    printf $fmt, qw{----- --- -----};
    return;
}

##</code><code>##

Enter whole or partial name for key (just hit Return to exit).

Name: cok
Match   Key         Value
-----   ---         -----
PARTIAL coke        1.25

Name: col
Match   Key         Value
-----   ---         -----
PARTIAL COLA        1.25
PARTIAL Coca Cola   1.25
PARTIAL Cola        1.25
PARTIAL Pepsi Cola  1.25
PARTIAL UNDEAD COLA <undefined>
PARTIAL Undead Cola <undefined>
PARTIAL Undead cola <undefined>
PARTIAL cola        1.25
PARTIAL undead cola <undefined>

Name: Coca Cola
Match   Key         Value
-----   ---         -----
EXACT   Coca Cola   1.25

Name: Undead Cola
Match   Key         Value
-----   ---         -----
EXACT   Undead Cola <undefined>
NO_CASE UNDEAD COLA <undefined>
NO_CASE Undead cola <undefined>
NO_CASE undead cola <undefined>

Name: Cola
Match   Key         Value
-----   ---         -----
EXACT   Cola        1.25
NO_CASE COLA        1.25
NO_CASE cola        1.25
PARTIAL Coca Cola   1.25
PARTIAL Pepsi Cola  1.25
PARTIAL UNDEAD COLA <undefined>
PARTIAL Undead Cola <undefined>
PARTIAL Undead cola <undefined>
PARTIAL undead cola <undefined>

Name: cola
Match   Key         Value
-----   ---         -----
EXACT   cola        1.25
NO_CASE COLA        1.25
NO_CASE Cola        1.25
PARTIAL Coca Cola   1.25
PARTIAL Pepsi Cola  1.25
PARTIAL UNDEAD COLA <undefined>
PARTIAL Undead Cola <undefined>
PARTIAL Undead cola <undefined>
PARTIAL undead cola <undefined>

Name: ^cola$
Only alphanumeric+space name searches allowed.

Name: (?{/path/to/evil_code})
Only alphanumeric+space name searches allowed.

Name: Nightingale Tongues in Aspic
No keys match 'Nightingale Tongues in Aspic'.

Name: p
Match   Key         Value
-----   ---         -----
PARTIAL Pepsi Cola  1.25
PARTIAL pizza       12.00

Name: s
Match   Key         Value
-----   ---         -----
PARTIAL Pepsi Cola  1.25
PARTIAL sandwich    3.00

Name:
Exiting ...