From 1338282cc92fc83b5be4714144d54ba38e0b400a Mon Sep 17 00:00:00 2001
From: Feross Aboukhadijeh <feross@feross.org>
Date: Sun, 3 May 2015 16:38:16 -0700
Subject: [PATCH] prevent negative complete/incomplete numbers

Fixes #65
Fixes #72
---
 lib/swarm.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/lib/swarm.js b/lib/swarm.js
index adf8406..5faa3c2 100644
--- a/lib/swarm.js
+++ b/lib/swarm.js
@@ -19,8 +19,6 @@ Swarm.prototype.announce = function (params, cb) {
   if (self[fn]) {
     self[fn](params, peer) // process event
 
-    if (params.left === 0 && peer) peer.complete = true
-
     cb(null, {
       complete: self.complete,
       incomplete: self.incomplete,
@@ -86,6 +84,12 @@ Swarm.prototype._onAnnounce_update = function (params, peer) {
     debug('unexpected `update` event from peer that is not in swarm')
     return this._onAnnounce_started(params, peer) // treat as a start
   }
+
+  if (!peer.complete && params.left === 0) {
+    this.complete += 1
+    this.incomplete -= 1
+    peer.complete = true
+  }
 }
 
 // TODO: randomize the peers that are given out