feature: onboarding emails

* wip

* wip

* wip

* fix coderabbit comments

* remove template

packages/payments/src/prices.ts

@@ -1,5 +1,11 @@
 export type { ProductPrice } from '@polar-sh/sdk/models/components/productprice.js';
 
+function formatEventsCount(events: number) {
+  return new Intl.NumberFormat('en-gb', {
+    notation: 'compact',
+  }).format(events);
+}
+
 export type IPrice = {
   price: number;
   events: number;
@@ -39,3 +45,29 @@ export const FREE_PRODUCT_IDS = [
   'a18b4bee-d3db-4404-be6f-fba2f042d9ed', // Prod
   '036efa2a-b3b4-4c75-b24a-9cac6bb8893b', // Sandbox
 ];
+
+export function getRecommendedPlan<T>(
+  monthlyEvents: number | undefined | null,
+  cb: (
+    options: {
+      formattedEvents: string;
+      formattedPrice: string;
+    } & IPrice,
+  ) => T,
+): T | undefined {
+  if (!monthlyEvents) {
+    return undefined;
+  }
+  const price = PRICING.find((price) => price.events >= monthlyEvents);
+  if (!price) {
+    return undefined;
+  }
+  return cb({
+    ...price,
+    formattedEvents: formatEventsCount(price.events),
+    formattedPrice: Intl.NumberFormat('en-US', {
+      style: 'currency',
+      currency: 'USD',
+    }).format(price.price),
+  });
+}