TransitiveMoV

#!/usr/bin/perl
use strict;
use warnings;

my $file = $ARGV[0] or die "No file specified";
my %scores = ();
my %power = ();

sub read_csv($) {
	my $file = shift;
	open(DATA, '<', $file) or die "could not open $file";
	my $header = <DATA>;
	chomp $header;
	my ($homeTeam, $homeScore, $awayTeam, $awayScore) = (0, 0, 0, 0);
	my @fields = split(/,\s*/, $header);
	for my $i (0 .. $#fields) {
		if ($fields[$i] =~ /Home team/i) {
			$homeTeam = $i;
		}
		if ($fields[$i] =~ /Vis team/i) {
			$awayTeam = $i;
		}
		if ($fields[$i] =~ /score/i) {
			($homeTeam > $awayTeam) ? $homeScore = $i : $awayScore = $i;
		}
	}
	my $i = 0;
	while (my $line = <DATA>){
		chomp $line;
		@fields = split(/,\s*/, $line);
		$scores{$i}{'t1'} = $fields[$homeTeam];
		$scores{$i}{'t1s'} = $fields[$homeScore];
		$scores{$i}{'t2'} = $fields[$awayTeam];
		$scores{$i}{'t2s'} = $fields[$awayScore];
		$i++;
	}
}

sub calculate_deltas($$$$){
	my ($t1Power, $t2Power, $scoreDiff, $velocity) = @_;
	my $t1Target = $t2Power + $scoreDiff;
	my $t2Target = $t1Power - $scoreDiff;
	return ((($t1Target-$t1Power)*$velocity),(($t2Target-$t2Power)*$velocity));
}

sub init_power() {
	foreach my $i (keys %scores) {
		$power{$scores{$i}{'t1'}} = 100;
		$power{$scores{$i}{'t2'}} = 100;
	}
}

sub run_round($) {
	my ($velocity) = @_;
	my %new_power = %power;
	foreach my $i (keys %scores) {
		my $t1p = $power{$scores{$i}{'t1'}};
		my $t2p = $power{$scores{$i}{'t2'}};
		my $diff = $scores{$i}{'t1s'} - $scores{$i}{'t2s'};
		my ($d1, $d2) = calculate_deltas($t1p, $t2p, $diff, $velocity);
		$new_power{$scores{$i}{'t1'}} += $d1;
		$new_power{$scores{$i}{'t2'}} += $d2;
	}
	%power = %new_power;
}

sub print_sorted_power(%){
	my %pwr = @_;
	my @sorted = sort {$pwr{$a} <=> $pwr{$b}} (keys %pwr);
	foreach my $team (@sorted) {
		print "$team: $pwr{$team}\n";
	}
}

read_csv($file);
init_power();
my $roundMax = 10000;
for (my $r = 0; $r < $roundMax; $r++) {
	my $velocity = .05 - .05*($r/$roundMax);
	run_round($velocity);
}
print_sorted_power(%power);