feat: fetch data for charts

apps/openpage-api/lib/transform-repo-stats.ts

@@ -0,0 +1,71 @@
+// Define interfaces for the data structure
+type RepoStats = {
+  stars: number;
+  forks: number;
+  mergedPRs: number;
+  openIssues: number;
+};
+
+type DataEntry = {
+  [key: string]: RepoStats;
+};
+
+type TransformedData = {
+  labels: string[];
+  datasets: {
+    label: string;
+    data: number[];
+  }[];
+};
+
+type MonthNames = {
+  [key: string]: string;
+};
+
+type MetricKey = keyof RepoStats;
+
+const FRIENDLY_METRIC_NAMES: { [key in MetricKey]: string } = {
+  stars: 'Stars',
+  forks: 'Forks',
+  mergedPRs: 'Merged PRs',
+  openIssues: 'Open Issues',
+};
+
+export function transformRepoStats(data: DataEntry, metric: MetricKey): TransformedData {
+  const sortedEntries = Object.entries(data).sort(([dateA], [dateB]) => {
+    const [yearA, monthA] = dateA.split('-').map(Number);
+    const [yearB, monthB] = dateB.split('-').map(Number);
+    return new Date(yearA, monthA - 1).getTime() - new Date(yearB, monthB - 1).getTime();
+  });
+
+  const monthNames: MonthNames = {
+    '1': 'Jan',
+    '2': 'Feb',
+    '3': 'Mar',
+    '4': 'Apr',
+    '5': 'May',
+    '6': 'Jun',
+    '7': 'Jul',
+    '8': 'Aug',
+    '9': 'Sep',
+    '10': 'Oct',
+    '11': 'Nov',
+    '12': 'Dec',
+  };
+
+  const labels = sortedEntries.map(([date]) => {
+    const [year, month] = date.split('-');
+    const monthIndex = parseInt(month);
+    return `${monthNames[monthIndex.toString()]} ${year}`;
+  });
+
+  return {
+    labels,
+    datasets: [
+      {
+        label: `Total ${FRIENDLY_METRIC_NAMES[metric]}`,
+        data: sortedEntries.map(([_, stats]) => stats[metric]),
+      },
+    ],
+  };
+}