added 260907 version of worker toolkit

worker-toolkit-flaredown/repo/frontend/app/mixins/chart/dates-retriever.js

@@ -0,0 +1,43 @@
+import Ember from 'ember';
+import moment from 'moment';
+
+const {
+  get,
+  computed,
+  Mixin,
+} = Ember;
+
+export default Mixin.create({
+  startAt: computed('daysRadius', 'centeredDate', function() {
+    const daysRadius = get(this, 'daysRadius');
+    const centeredDate = get(this, 'centeredDate');
+
+    if (centeredDate) {
+      return moment(centeredDate).subtract(daysRadius, 'days');
+    } else {
+      return moment().subtract(daysRadius * 2, 'days');
+    }
+  }),
+
+  endAt: computed('daysRadius', 'centeredDate', function() {
+    const centeredDate = get(this, 'centeredDate');
+
+    if (centeredDate) {
+      return moment(centeredDate).add(get(this, 'daysRadius'), 'days');
+    } else {
+      return moment();
+    }
+  }),
+
+  daysRadius: computed('SVGWidth', function() {
+    return Math.ceil(get(this, 'SVGWidth') / (get(this, 'pixelsPerDate') * 2));
+  }),
+
+  startAtWithCache: computed('startAt', function() {
+    return moment(get(this, 'startAt')).subtract(get(this, 'daysRadius'), 'days');
+  }),
+
+  endAtWithCache: computed('endAt', function() {
+    return moment(get(this, 'endAt')).add(get(this, 'daysRadius'), 'days');
+  })
+})