From d8f3dfdeadf78a3731ea1067e7a55378da29f13b Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Tue, 24 Mar 2015 04:00:01 +0000
Subject: play a sound three minutes before the end of the lesson

---
 assets/js/main.js | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/assets/js/main.js b/assets/js/main.js
index d72d8e9..ab260cd 100644
--- a/assets/js/main.js
+++ b/assets/js/main.js
@@ -12,6 +12,9 @@ $.ionSound({
         {
             name: "button_tiny",
         },
+        {
+            name: "bell_ring",
+        },
         {
             name: "cheonjae",
         },
@@ -39,6 +42,40 @@ $.ionSound({
     preload: true
 });
 
+// Play a sound three minutes before the end of each lesson.
+
+var loaded = new Date();
+var loadedYear = loaded.getYear();
+var loadedMonth = loaded.getMonth();
+var loadedDay = loaded.getDay();
+var lessonEndWarningTimes = [[9,  37],
+                             [10, 27],
+                             [11, 17],
+                             [12,  7],
+                             [13, 37],
+                             [14, 27]];
+
+function watchEndOfLesson ()
+{
+    var now = new Date();
+    var hours = now.getHours()
+    var minutes = now.getMinutes()
+    for (var i = 0; i < lessonEndWarningTimes.length; i++)
+    {
+        if (lessonEndWarningTimes[i][0] == hours && lessonEndWarningTimes[i][1] == minutes)
+        {
+            $.ionSound.play("bell_ring");
+            break;
+        }
+    }
+}
+
+// At the next top of the minute, start checking for three minutes
+// before the end of the lesson.
+
+var startWatching = 1000 - loaded.getMilliseconds() + 1000 * (60 - loaded.getSeconds())
+window.setTimeout(function () { watchEndOfLesson(); window.setInterval(watchEndOfLesson, 60000); }, startWatching);
+
 // random integers
 
 // courtesy of https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random
-- 
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