From abc4902d342d048b3fc2829f96c1e51ecfdc5268 Mon Sep 17 00:00:00 2001
From: Guangcong Luo <guangcongluo@gmail.com>
Date: Sun, 28 Feb 2016 01:57:13 -0500
Subject: [PATCH] Make less popular ladders decay slower

---
 lib/ntbb-ladder.lib.php | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/lib/ntbb-ladder.lib.php b/lib/ntbb-ladder.lib.php
index 58f53b6a3..ab0da2b5c 100755
--- a/lib/ntbb-ladder.lib.php
+++ b/lib/ntbb-ladder.lib.php
@@ -281,13 +281,25 @@ class NTBBLadder {
 
 				// decay
 				if ($elo >= 1400) {
-					if (count($rating->M)) {
+					$decay = 0;
+					if (count($rating->M) > 5) {
+						// user was very active
+					} else if (count($rating->M)) {
 						// user was active
-						$elo -= 0 + intval(($elo-1400)/100);
+						$decay = 0 + intval(($elo-1400)/100);
 					} else {
 						// user was inactive
-						$elo -= 1 + intval(($elo-1400)/50);
+						$decay = 1 + intval(($elo-1400)/50);
 					}
+					switch ($this->formatid) {
+					case 'randombattle':
+					case 'ou':
+						break;
+					default:
+						$decay -= 2;
+						break;
+					}
+					if ($decay > 0) $elo -= $decay;
 				}
 
 				$rating->update();