feat: open page api (#1419)

apps/openpage-api/lib/transform-data.ts

@@ -0,0 +1,68 @@
+import { DateTime } from 'luxon';
+
+type MetricKeys = {
+  stars: number;
+  forks: number;
+  mergedPRs: number;
+  openIssues: number;
+  earlyAdopters: number;
+};
+
+type DataEntry = {
+  [key: string]: MetricKeys;
+};
+
+type TransformData = {
+  labels: string[];
+  datasets: {
+    label: string;
+    data: number[];
+  }[];
+};
+
+type MetricKey = keyof MetricKeys;
+
+const FRIENDLY_METRIC_NAMES: { [key in MetricKey]: string } = {
+  stars: 'Stars',
+  forks: 'Forks',
+  mergedPRs: 'Merged PRs',
+  openIssues: 'Open Issues',
+  earlyAdopters: 'Customers',
+};
+
+export function transformData({
+  data,
+  metric,
+}: {
+  data: DataEntry;
+  metric: MetricKey;
+}): TransformData {
+  const sortedEntries = Object.entries(data).sort(([dateA], [dateB]) => {
+    const [yearA, monthA] = dateA.split('-').map(Number);
+    const [yearB, monthB] = dateB.split('-').map(Number);
+
+    return DateTime.local(yearA, monthA).toMillis() - DateTime.local(yearB, monthB).toMillis();
+  });
+
+  const labels = sortedEntries.map(([date]) => {
+    const [year, month] = date.split('-');
+    const dateTime = DateTime.fromObject({
+      year: Number(year),
+      month: Number(month),
+    });
+    return dateTime.toFormat('MMM yyyy');
+  });
+
+  return {
+    labels,
+    datasets: [
+      {
+        label: `Total ${FRIENDLY_METRIC_NAMES[metric]}`,
+        data: sortedEntries.map(([_, stats]) => stats[metric]),
+      },
+    ],
+  };
+}
+
+// To be on the safer side
+export const transformRepoStats = transformData;