feat(form): show response totals and queue numbers

lib/form-submission-stats.ts

@@ -0,0 +1,53 @@
+import { db } from "@/db";
+import { sql } from "drizzle-orm";
+
+export type FormSubmissionStats = {
+  totalAnswers: number;
+  queueNumber: number | null;
+};
+
+export async function getFormSubmissionStats(
+  formIds: string[],
+  discordId: string | null
+): Promise<Map<string, FormSubmissionStats>> {
+  if (formIds.length === 0) {
+    return new Map();
+  }
+
+  const rows = await db.execute<{
+    formId: string;
+    totalAnswers: number;
+    queueNumber: number | null;
+  }>(sql`
+    with ranked_submissions as (
+      select
+        form_id,
+        user_discord_id,
+        count(*) over (partition by form_id)::integer as total_answers,
+        row_number() over (
+          partition by form_id
+          order by submitted_at asc, id asc
+        )::integer as queue_number
+      from form.submission
+      where form_id in (${sql.join(formIds.map((formId) => sql`${formId}`), sql`, `)})
+    )
+    select
+      form_id as "formId",
+      max(total_answers)::integer as "totalAnswers",
+      max(queue_number) filter (
+        where user_discord_id = ${discordId}
+      )::integer as "queueNumber"
+    from ranked_submissions
+    group by form_id
+  `);
+
+  return new Map(
+    rows.map((row) => [
+      row.formId,
+      {
+        totalAnswers: row.totalAnswers,
+        queueNumber: row.queueNumber,
+      },
+    ])
+  );
+}