From e05962752502c0c72eb311af9622bbc5c9261738 Mon Sep 17 00:00:00 2001
From: "Steinar H. Gunderson" <sesse@debian.org>
Date: Sun, 9 Dec 2007 14:33:30 +0100
Subject: [PATCH] Parametrize initial rating/RD instead of hardcoding it.

---
 foosball.pm             | 21 ++++++++++++---------
 recalc-double-result.pl |  2 +-
 recalc-single-result.pl |  2 +-
 3 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/foosball.pm b/foosball.pm
index b40b9fd..b5750b2 100644
--- a/foosball.pm
+++ b/foosball.pm
@@ -5,6 +5,9 @@ use POSIX;
 
 package foosball;
 
+our $initial_rating = 1500.0;
+our $initial_rd = 350.0;
+
 sub db_connect {
 	my $dbh = DBI->connect("dbi:Pg:dbname=foosball;host=127.0.0.1", "foosball", "cleanrun", {AutoCommit => 0});
 	$dbh->{RaiseError} = 1;
@@ -25,8 +28,8 @@ sub find_single_rating {
 	$rd = apply_aging($rd, $age / 86400.0);
 
 	if (!defined($rating)) {
-		$rating = 1500;
-		$rd = 350;
+		$rating = $initial_rating;
+		$rd = $initial_rd;
 	}
 
 	return ($rating, $rd);
@@ -40,8 +43,8 @@ sub find_double_rating {
 	$rd = apply_aging($rd, $age / 86400.0);
 	
 	if (!defined($rating)) {
-		$rating = 1500;
-		$rd = 350;
+		$rating = $initial_rating;
+		$rd = $initial_rd;
 	}
 
 	return ($rating, $rd);
@@ -54,10 +57,10 @@ sub create_user_if_not_exists {
 	return if ($count > 0);
 	$dbh->do('INSERT INTO users (username) VALUES (?)',
 		undef, $username);
-	$dbh->do('INSERT INTO single_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,1500.0,350.0)',
-		undef, $username);
-	$dbh->do('INSERT INTO double_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,1500.0,350.0)',
-		undef, $username);
+	$dbh->do('INSERT INTO single_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,?,?)',
+		undef, $username, $initial_rating, $initial_rd);
+	$dbh->do('INSERT INTO double_rating (username,ratetime,rating,rd) VALUES (?,CURRENT_TIMESTAMP,?,?)',
+		undef, $username, $initial_rating, $initial_rd);
 	return $dbh;
 }
 
@@ -67,7 +70,7 @@ our $c = 8;
 sub apply_aging {
 	my ($rd, $age) = @_;
 	$rd = sqrt($rd*$rd + $c * $c * ($age / 86400.0));
-	$rd = 350.0 if ($rd > 350.0);
+	$rd = $initial_rd if ($rd > $initial_rd);
 	return $rd;
 }
 
diff --git a/recalc-double-result.pl b/recalc-double-result.pl
index b606b5a..4e20c15 100755
--- a/recalc-double-result.pl
+++ b/recalc-double-result.pl
@@ -19,7 +19,7 @@ while (my $ref = $q->fetchrow_hashref) {
 	for my $user (($ref->{'team1_username1'}, $ref->{'team1_username2'},
 	               $ref->{'team2_username1'}, $ref->{'team2_username2'})) {
 		if (!exists($ratings{$user})) {
-			$ratings{$user} = [ 1500, 350, 0 ];
+			$ratings{$user} = [ $foosball::initial_rating, $foosball::initial_rd, 0 ];
 		}
 	}
 	
diff --git a/recalc-single-result.pl b/recalc-single-result.pl
index 6794787..8c6923b 100755
--- a/recalc-single-result.pl
+++ b/recalc-single-result.pl
@@ -21,7 +21,7 @@ my $cll = 0.0;
 while (my $ref = $q->fetchrow_hashref) {
 	for my $user (($ref->{'username1'}, $ref->{'username2'})) {
 		if (!exists($ratings{$user})) {
-			$ratings{$user} = [ 1500, 350, 0 ];
+			$ratings{$user} = [ $foosball::initial_rating, $foosball::initial_rd, 0 ];
 		}
 	}
 	
-- 
2.39.2