// Copyright (c) 2015 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

'use strict';

var inherits = require('util').inherits;
var extend = require('xtend');

var TChannelPeersBase = require('./peers_base.js');
var TChannelPeer = require('./peer');
var TChannelSelfPeer = require('./self_peer');

function TChannelRootPeers(channel, options) {
    if (!(this instanceof TChannelRootPeers)) {
        return new TChannelRootPeers(channel, options);
    }

    var self = this;
    TChannelPeersBase.call(self, channel, options);

    self.allocPeerEvent = self.defineEvent('allocPeer');
    self.peerOptions = self.options.peerOptions || {};

    self.selfPeer = null;
}

inherits(TChannelRootPeers, TChannelPeersBase);

TChannelRootPeers.prototype.close = function close(callback) {
    var self = this;

    var peers = self.values();
    if (self.selfPeer) {
        peers.push(self.selfPeer);
    }
    TChannelPeersBase.prototype.close.call(self, peers, callback);
};

TChannelRootPeers.prototype.sanitySweep =
function sanitySweep(callback) {
    var self = this;

    if (!self.selfPeer) {
        TChannelPeersBase.prototype.sanitySweep.call(self, callback);
        return;
    }

    for (var i = 0; i < self.selfPeer.connections.length; i++) {
        var conn = self.selfPeer.connections[i];
        conn.ops.sanitySweep();
    }

    TChannelPeersBase.prototype.sanitySweep.call(self, callback);
};

TChannelRootPeers.prototype.getSelfPeer = function getSelfPeer() {
    var self = this;

    if (!self.selfPeer) {
        self.selfPeer = TChannelSelfPeer(self.channel);
    }
    return self.selfPeer;
};

TChannelRootPeers.prototype.add = function add(hostPort, options) {
    /*eslint max-statements: [2, 25]*/
    var self = this;

    var peer = self._map[hostPort];
    if (peer) {
        return peer;
    }

    if (hostPort === self.channel.hostPort) {
        return self.getSelfPeer();
    }

    options = options || extend({}, self.peerOptions);
    options.preferConnectionDirection = self.preferConnectionDirection;
    peer = TChannelPeer(self.channel, hostPort, options);
    self.allocPeerEvent.emit(self, peer);

    self._map[hostPort] = peer;
    self._keys.push(hostPort);

    return peer;
};

TChannelRootPeers.prototype.clear = function clear() {
    var self = this;

    var names = Object.keys(self.channel.subChannels);
    for (var i = 0; i < names.length; i++) {
        var subChannel = self.channel.subChannels[names[i]];
        subChannel.peers.clear();
    }

    self._map = Object.create(null);
    self._keys = [];
};

TChannelRootPeers.prototype._delete = function _del(peer) {
    var self = this;

    var names = Object.keys(self.channel.subChannels);
    for (var i = 0; i < names.length; i++) {
        var subChannel = self.channel.subChannels[names[i]];
        subChannel.peers._delete(peer);
    }

    delete self._map[peer.hostPort];
    var index = self._keys.indexOf(peer.hostPort);
    popout(self._keys, index);
};

TChannelRootPeers.prototype.choosePeer = function choosePeer(req) {
    return null;
};

function popout(array, i) {
    if (!array.length) {
        return;
    }

    var j = array.length - 1;
    if (i !== j) {
        var tmp = array[i];
        array[i] = array[j];
        array[j] = tmp;
    }
    array.pop();
}

module.exports = TChannelRootPeers;

@@ -1201,16 +1201,67 @@
 xtend');
+%0Avar setImmediate = require('timers').setImmediate;
 %0A%0Avar TC
@@ -2292,102 +2292,402 @@
     
-for (var i = 0; i %3C self.selfPeer.connections.length; i++) %7B%0A        var conn = self.selfPeer.
+nextConn(self.selfPeer.connections, 0, function connSweepDone(err) %7B%0A        if (err) %7B%0A            callback(err);%0A            return;%0A        %7D%0A%0A        TChannelPeersBase.prototype.sanitySweep.call(self, callback);%0A    %7D);%0A%0A    function nextConn(connections, index, cb) %7B%0A        if (index %3E= connections.length) %7B%0A            cb(null);%0A            return;%0A        %7D%0A%0A        var connection = 
 conn
@@ -2695,16 +2695,20 @@
 ctions%5Bi
+ndex
 %5D;%0A     
@@ -2714,16 +2714,22 @@
     conn
+ection
 .ops.san
@@ -2741,83 +2741,188 @@
 eep(
+function opsSweepDone() %7B%0A            setImmediate(deferNextConn
 );%0A    
+  
-%7D
+  %7D);
 %0A%0A    
+ 
-TChannelPeersBase.prototype.sanitySweep.call(self, callback);
+   function deferNextConn() %7B%0A            nextConn(connections, index + 1, cb);%0A        %7D%0A    %7D
 %0A%7D;%0A

Use an async deferred loop instead of for loop