#!/usr/bin/env perl
use 5.012;
use warnings;

use List::Util qw(min max);

# Build cost table
my %costs;
while (my $_ = <DATA>) {
    # Remove newlines, stop at empty line.
    chomp; last unless $_;

    # Split input into fields
    # NOTE: use proper CSV parser in production code
    my ($prefix, $name, $cost) = split /\s*;\s*/;
    # Fix broken decimal point notation and convert into cost per second
    $cost =~ y/,/./;

    # Create table entry
    $costs{$prefix} = { name => $name, cost => $cost };
}

# Determine minimum and maximum prefix length
my ($min_prefix, $max_prefix) = do {
    my @lengths = map length, keys %costs;
    min(@lengths), max(@lengths);
};

# Lookup prefix in cost table
sub cost_ref {
    my ($number) = @_;
    for my $_ (reverse $min_prefix .. $max_prefix) {
        if (my $entry = $costs{substr $number, 0, $_}) {
            return $entry;
        }
    }

    return undef;
}

# Examine data
while (my $_ = <DATA>) {
    # Remove newlines
    chomp;

    # Split input into fields
    # NOTE: use proper CSV parser in production code
    my ($f0, $f1, $f2, $hms, $f3, $f4, $number) = split /\s*;\s*/;
    # Convert H:M:S into minutes
    my ($h, $m, $s) = split /:/, $hms, 3;
    $m += $h*60 + $s/60;

    # Find cost information and report results
    if (my $entry = cost_ref($number)) {
        my ($name, $cost) = map $entry->{$_}, qw(name cost);
        $cost *= $m;
        say "Call to $number for $m m using $name with cost $cost";
    }
    else {
        say "Call to $number for $ m with unknown cost";
    }
}

__DATA__
0041; schweiz festnetz; 3,1
004176; schweiz mobil; 30
004178; schweiz mobil; 30
004179; schweiz mobil; 30
004186076; schweiz mobil; 30
004186078; schweiz mobil; 30
004186079; schweiz mobil; 30

a; b; c; 0:02:34; d; e; 0041442011234
a; b; c; 0:01:42; d; e; 0041795091234
a; b; c; 0:42:23; d; e; 0041860765091234