refactor: have Graph.init and Graph.update return promises

public/src/admin/modules/dashboard-line-graph.js

@@ -1,6 +1,6 @@
 'use strict';
 
-define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress', 'api'], function (Chart, translator, Benchpress, api) {
+define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress', 'api', 'hooks'], function (Chart, translator, Benchpress, api, hooks) {
 	const Graph = {
 		_current: null,
 	};
@@ -16,7 +16,10 @@ define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress
 			Chart.defaults.global.tooltips.enabled = false;
 		}
 
+		Graph.handleUpdateControls({ set });
+
 		var t = translator.Translator.create();
+		return new Promise((resolve) => {
 			t.translateKey(`admin/menu:${ajaxify.data.template.name.replace('admin/', '')}`, []).then((key) => {
 				const data = {
 					labels: trafficLabels,
@@ -68,10 +71,15 @@ define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress
 				});
 
 				if (!dataset) {
-				Graph.update(set);
+					Graph.update(set).then(resolve);
+				} else {
+					resolve(Graph._current);
 				}
 			});
+		});
+	};
 
+	Graph.handleUpdateControls = ({ set }) => {
 		$('[data-action="updateGraph"]:not([data-units="custom"])').on('click', function () {
 			var until = new Date();
 			var amount = $(this).attr('data-amount');
@@ -151,9 +159,10 @@ define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress
 		amount = ajaxify.data.query.count
 	) => {
 		if (!Graph._current) {
-			return;
+			return Promise.reject(new Error('[[error:invalid-data]]'));
 		}
 
+		return new Promise((resolve) => {
 			api.get(`/admin/analytics/${set}`, { units, until, amount }).then((dataset) => {
 				if (units === 'days') {
 					Graph._current.data.xLabels = utils.getDaysArray(until, amount);
@@ -174,6 +183,11 @@ define('admin/modules/dashboard-line-graph', ['Chart', 'translator', 'benchpress
 				});
 				apiEl.attr('href', `${config.relative_path}/api/v3/admin/analytics/${ajaxify.data.set}?${newHref}`);
 				ajaxify.updateHistory(`${ajaxify.data.url.slice(1)}?${newHref}`, true);
+				hooks.fire('action:admin.dashboard.updateGraph', {
+					graph: Graph._current,
+				});
+				resolve(Graph._current);
+			});
 		});
 	};