8 our $initial_rating = 1500.0;
9 our $initial_rd = 350.0;
12 my $dbh = DBI->connect("dbi:Pg:dbname=foosball;host=127.0.0.1", "foosball", "cleanrun", {AutoCommit => 0});
13 $dbh->{RaiseError} = 1;
19 return -round(-$x) if ($x < 0.0);
20 return POSIX::floor($x + 0.5);
23 sub find_single_rating {
24 my ($dbh, $username, $limit) = @_;
25 $limit = "" if (!defined($limit));
26 my ($age, $rating, $rd) = $dbh->selectrow_array('SELECT EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP-ratetime)), rating, rd FROM single_rating WHERE username=? '.$limit.' ORDER BY ratetime DESC LIMIT 1',
28 $rd = apply_aging($rd, $age / 86400.0);
30 if (!defined($rating)) {
31 $rating = $initial_rating;
35 return ($rating, $rd);
38 sub find_double_rating {
39 my ($dbh, $username, $limit) = @_;
40 $limit = "" if (!defined($limit));
41 my ($age, $rating, $rd) = $dbh->selectrow_array('SELECT EXTRACT(EPOCH FROM (CURRENT_TIMESTAMP-ratetime)), rating, rd FROM double_rating WHERE username=? '.$limit.'ORDER BY ratetime DESC LIMIT 1',
43 $rd = apply_aging($rd, $age / 86400.0);
45 if (!defined($rating)) {
46 $rating = $initial_rating;
50 return ($rating, $rd);
53 sub create_user_if_not_exists {
54 my ($dbh, $username) = @_;
55 my $count = $dbh->selectrow_array('SELECT count(*) FROM users WHERE username=?',
57 return if ($count > 0);
58 $dbh->do('INSERT INTO users (username) VALUES (?)',
60 $dbh->do('INSERT INTO single_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,?,?)',
61 undef, $username, $initial_rating, $initial_rd);
62 $dbh->do('INSERT INTO double_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,?,?)',
63 undef, $username, $initial_rating, $initial_rd);
67 # c=8 => RD=50 moves to RD=350 over approx. five years
72 $rd = sqrt($rd*$rd + $c * $c * ($age / 86400.0));
73 $rd = $initial_rd if ($rd > $initial_rd);
78 my ($rating1, $rd1, $rating2, $rd2, $score1, $score2) = @_;
79 my $result = `/srv/foosball.sesse.net/foosrank $rating1 $rd1 $rating2 $rd2 $score1 $score2`;
81 my ($newr1, $newrd1, $likelihood) = split / /, $result;
83 $newrd1 = 30.0 if ($newrd1 < 30.0);
85 return ($newr1, $newrd1, $likelihood);
88 sub calc_rating_double {
89 my ($rating1, $rd1, $rating2, $rd2, $rating3, $rd3, $rating4, $rd4, $score1, $score2) = @_;
90 my $result = `/srv/foosball.sesse.net/foosrank $rating1 $rd1 $rating2 $rd2 $rating3 $rd3 $rating4 $rd4 $score1 $score2`;
92 my ($newr1, $newrd1) = split / /, $result;
94 $newrd1 = 30.0 if ($newrd1 < 30.0);
96 return ($newr1, $newrd1);