Add function to get last seen status from last active date.

frontend_tests/node_tests/activity.js

@@ -13,6 +13,14 @@ set_global('document', {
     },
 });
 
+set_global('i18n', {
+    t: function (string) {
+        return string;
+    },
+});
+
+set_global('XDate', require("xdate"));
+
 add_dependencies({
     Handlebars: 'handlebars',
     templates: 'js/templates',
@@ -25,6 +33,7 @@ add_dependencies({
     narrow: 'js/narrow.js',
     presence: 'js/presence.js',
     activity: 'js/activity.js',
+    timerender: 'js/timerender.js',
 });
 
 var presence = global.presence;

frontend_tests/node_tests/timerender.js

@@ -187,3 +187,55 @@ var timerender = require('js/timerender.js');
     var actual = attrs.get('title');
     assert.equal(expected, actual);
 }());
+
+(function test_last_seen_status_from_date() {
+    // Set base_dateto to March 1 2016 12.30 AM (months are zero based)
+    var base_date = new XDate(2016, 2, 1, 0, 30);
+
+    function assert_same(modifier, expected_status) {
+        var past_date = base_date.clone();
+        past_date = modifier(past_date);
+        var actual_status = timerender.last_seen_status_from_date(past_date, base_date);
+        assert.equal(actual_status, expected_status);
+    }
+
+    assert_same(function (d) { return d.addSeconds(-20); },
+                i18n.t("Last seen just now"));
+
+    assert_same(function (d) { return d.addMinutes(-1); },
+                i18n.t("Last seen just now"));
+
+    assert_same(function (d) { return d.addMinutes(-2); },
+                i18n.t("Last seen just now"));
+
+    assert_same(function (d) { return d.addMinutes(-30); },
+                i18n.t("Last seen 30 minutes ago"));
+
+    assert_same(function (d) { return d.addHours(-1); },
+                i18n.t("Last seen an hour ago"));
+
+    assert_same(function (d) { return d.addHours(-2); },
+                i18n.t("Last seen 2 hours ago"));
+
+    assert_same(function (d) { return d.addHours(-20); },
+                i18n.t("Last seen 20 hours ago"));
+
+    assert_same(function (d) { return d.addDays(-1); },
+                i18n.t("Last seen yesterday"));
+
+    assert_same(function (d) { return d.addDays(-2); },
+                i18n.t("Last seen on Feb 28"));
+
+    assert_same(function (d) { return d.addDays(-61); },
+                i18n.t("Last seen on Dec 31"));
+
+    assert_same(function (d) { return d.addDays(-300); },
+                i18n.t("Last seen on May 06"));
+
+    assert_same(function (d) { return d.addDays(-366); },
+                i18n.t("Last seen on Mar 01, 2015"));
+
+    assert_same(function (d) { return d.addYears(-3); },
+                i18n.t("Last seen on Mar 01, 2013"));
+
+}());

static/js/timerender.js

@@ -62,6 +62,39 @@ exports.render_now = function (time, today) {
     };
 };
 
+// Current date is passed as an argument for unit testing
+exports.last_seen_status_from_date = function (last_active_date, current_date) {
+    if (typeof  current_date === 'undefined') {
+         current_date = new XDate();
+    }
+
+    var minutes = Math.floor(last_active_date.diffMinutes(current_date));
+    if (minutes <= 2) {
+        return i18n.t("Last seen just now");
+    }
+    if (minutes < 60) {
+        return i18n.t("Last seen " + minutes +" minutes ago");
+    }
+
+    var hours = Math.floor(minutes / 60);
+    if (hours === 1) {
+         return i18n.t("Last seen an hour ago");
+    }
+    if (hours < 24) {
+        return i18n.t("Last seen " + hours + " hours ago");
+    }
+
+    var days = Math.floor(hours / 24);
+    if (days === 1) {
+        return [i18n.t("Last seen yesterday")];
+    }
+    if (days < 365) {
+        return i18n.t("Last seen on " + last_active_date.toString("MMM\xa0dd"));
+    }
+
+    return i18n.t("Last seen on " + last_active_date.toString("MMM\xa0dd,\xa0yyyy"));
+};
+
 // List of the dates that need to be updated when the day changes.
 // Each timestamp is represented as a list of length 2:
 //   [id of the span element, XDate representing the time]