From da018c363977d332a0acbf35921071bc1ea14fef Mon Sep 17 00:00:00 2001
From: Mark Hahnenberg <mark@nylas.com>
Date: Mon, 27 Mar 2017 14:05:36 -0700
Subject: [PATCH] [client-app] Report battery state changes to Mixpanel

Summary:
This diff will give us insight into how people use Nylas Mail on their
computers with respect to how mobile they are (i.e. whether they use NM
on battery or plugged in).

Test Plan: Run locally

Reviewers: evan, spang, juan

Reviewed By: juan

Subscribers: gleb

Differential Revision: https://phab.nylas.com/D4267
---
 .../client-app/src/services/battery-status-manager.es6   | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/packages/client-app/src/services/battery-status-manager.es6 b/packages/client-app/src/services/battery-status-manager.es6
index 7e1a11e9e..a9241be11 100644
--- a/packages/client-app/src/services/battery-status-manager.es6
+++ b/packages/client-app/src/services/battery-status-manager.es6
@@ -1,8 +1,11 @@
+import moment from 'moment-timezone'
+import Actions from '../flux/actions'
 
 class BatteryStatusManager {
   constructor() {
     this._callbacks = [];
     this._battery = null;
+    this._lastChangeTime = Date.now();
   }
 
   async activate() {
@@ -22,6 +25,12 @@ class BatteryStatusManager {
   }
 
   _onChargingChange = () => {
+    const changeTime = Date.now();
+    Actions.recordUserEvent("Battery State Changed", {
+      oldState: this.isBatteryCharging() ? 'battery' : 'ac',
+      oldStateDuration: Math.min(changeTime - this._lastChangeTime, moment.duration(12, 'hours').asMilliseconds()),
+    });
+    this._lastChangeTime = changeTime;
     this._callbacks.forEach(cb => cb());
   }