use strict;
use warnings;
use 5.010;

use HTML::Template;
use Data::Dumper;


my @lines = (
    "Bobby June abc 15 north good",
    "Bobby Sept xyz 20 north fair",
    "Bobby March xyz 10 north great",
    "Jenny July def 30 south poor",
    "Jenny Aug  stu 20 south bad",
);

my @inner_loop_fields 
    = qw{ lastmonth_period 
          device
          port
          direction
          usage };

my %combined_info_for;
  
    #key = customer name
    #value = array 

for (@lines) {
    my($name, @data) = split;

    my %field_info_for;
    @field_info_for{@inner_loop_fields} = @data;  

        #assignment to hash slice--allows you to do a mass 
        #assignment to multiple keys at once

    push @{$combined_info_for{$name}}, \%field_info_for;  

        #add hashes to the customer array--one array for each 
        #customer name, perl magic -> if array doesn't exist, 
        #create an empty one and push the value into the array
}

#say Dumper(%combined_info_for);  #check your work

my @outer_loop_fields = qw{ cust_name billfix_loop };
my @outer_loop_info;

while ( my($name, $AoH_ref) = each %combined_info_for ) {
    my %hash_for;
    @hash_for{@outer_loop_fields} = ($name, $AoH_ref);

        #assignment to a hash slice again--multiple keys in the hash
        #are assigned to in one step

    push @outer_loop_info, \%hash_for;
}


my $template = HTML::Template->new(filename => "html2.tmpl");
$template->param(custname_loop => \@outer_loop_info);
print $template->output();