add exp overflow migration

migrations/20130307_exp_overflow.js

@@ -0,0 +1,39 @@
+// mongo habitrpg ./node_modules/underscore/underscore.js ./migrations/20130307_normalize_algo_values.js
+
+/**
+ * Make sure people aren't overflowing their exp with the new system
+ */
+db.users.find().forEach(function(user){
+    function oldTnl(level) {
+        return (Math.pow(level,2)*10)+(level*10)+80
+    }
+
+    function newTnl(level) {
+        var value = 0;
+        if (level >= 100) {
+            value = 0
+        } else {
+            value = Math.round(((Math.pow(level,2)*0.25)+(10 * level) + 139.75)/10)*10; // round to nearest 10
+        }
+        return value
+    }
+
+    var newTnl = newTnl(user.stats.lvl);
+    if (user.stats.exp > newTnl) {
+        var percent = user.stats.exp / oldTnl(user.stats.lvl);
+        percent = (percent>1) ? 1 : percent;
+        user.stats.exp = newTnl * percent;
+
+        try {
+            db.users.update(
+                {_id:user._id},
+                {$set: {'stats.exp': user.stats.exp}},
+                {multi:true}
+            );
+        } catch(e) {
+            print(e);
+        }
+
+    }
+
+})