feat: open page api (#1419)

apps/openpage-api/lib/growth/get-monthly-completed-document.ts

@@ -0,0 +1,43 @@
+import { DateTime } from 'luxon';
+
+import { kyselyPrisma, sql } from '@documenso/prisma';
+import { DocumentStatus } from '@documenso/prisma/client';
+
+export const getCompletedDocumentsMonthly = async (type: 'count' | 'cumulative' = 'count') => {
+  const qb = kyselyPrisma.$kysely
+    .selectFrom('Document')
+    .select(({ fn }) => [
+      fn<Date>('DATE_TRUNC', [sql.lit('MONTH'), 'Document.updatedAt']).as('month'),
+      fn.count('id').as('count'),
+      fn
+        .sum(fn.count('id'))
+        // Feels like a bug in the Kysely extension but I just can not do this orderBy in a type-safe manner
+        // eslint-disable-next-line @typescript-eslint/consistent-type-assertions, @typescript-eslint/no-explicit-any
+        .over((ob) => ob.orderBy(fn('DATE_TRUNC', [sql.lit('MONTH'), 'Document.updatedAt']) as any))
+        .as('cume_count'),
+    ])
+    .where(() => sql`"Document"."status" = ${DocumentStatus.COMPLETED}::"DocumentStatus"`)
+    .groupBy('month')
+    .orderBy('month', 'desc')
+    .limit(12);
+
+  const result = await qb.execute();
+
+  const transformedData = {
+    labels: result.map((row) => DateTime.fromJSDate(row.month).toFormat('MMM yyyy')).reverse(),
+    datasets: [
+      {
+        label: type === 'count' ? 'Completed Documents per Month' : 'Total Completed Documents',
+        data: result
+          .map((row) => (type === 'count' ? Number(row.count) : Number(row.cume_count)))
+          .reverse(),
+      },
+    ],
+  };
+
+  return transformedData;
+};
+
+export type GetCompletedDocumentsMonthlyResult = Awaited<
+  ReturnType<typeof getCompletedDocumentsMonthly>
+>;