FEATURE: part 2 of dashboard improvements

- moderation tab
- sorting/pagination
- improved third party reports support
- trending charts
- better perf
- many fixes
- refactoring
- new reports

Co-Authored-By: Simon Cossar <scossar@users.noreply.github.com>

app/assets/javascripts/admin/mixins/period-computation.js.es6

@@ -0,0 +1,59 @@
+import DiscourseURL from "discourse/lib/url";
+import computed from "ember-addons/ember-computed-decorators";
+
+export default Ember.Mixin.create({
+  queryParams: ["period"],
+
+  period: "monthly",
+
+  availablePeriods: ["yearly", "quarterly", "monthly", "weekly"],
+
+  @computed("period")
+  startDate(period) {
+    let fullDay = moment()
+      .locale("en")
+      .utc()
+      .subtract(1, "day");
+
+    switch (period) {
+      case "yearly":
+        return fullDay.subtract(1, "year").startOf("day");
+        break;
+      case "quarterly":
+        return fullDay.subtract(3, "month").startOf("day");
+        break;
+      case "weekly":
+        return fullDay.subtract(1, "week").startOf("day");
+        break;
+      case "monthly":
+        return fullDay.subtract(1, "month").startOf("day");
+        break;
+      default:
+        return fullDay.subtract(1, "month").startOf("day");
+    }
+  },
+
+  @computed()
+  lastWeek() {
+    return moment()
+      .locale("en")
+      .utc()
+      .endOf("day")
+      .subtract(1, "week");
+  },
+
+  @computed()
+  endDate() {
+    return moment()
+      .locale("en")
+      .utc()
+      .subtract(1, "day")
+      .endOf("day");
+  },
+
+  actions: {
+    changePeriod(period) {
+      DiscourseURL.routeTo(this._reportsForPeriodURL(period));
+    }
+  }
+});