first commit

common/resources/client/billing/pricing-table/find-best-price.ts

@@ -0,0 +1,42 @@
+import {Price} from '../price';
+
+export type UpsellBillingCycle = 'monthly' | 'yearly';
+
+export function findBestPrice(
+  token: UpsellBillingCycle,
+  prices: Price[]
+): Price | undefined {
+  if (token === 'monthly') {
+    const match = findMonthlyPrice(prices);
+    if (match) return match;
+  }
+
+  if (token === 'yearly') {
+    const match = findYearlyPrice(prices);
+    if (match) return match;
+  }
+
+  return prices[0];
+}
+
+function findYearlyPrice(prices: Price[]) {
+  return prices.find(price => {
+    if (price.interval === 'month' && price.interval_count >= 12) {
+      return price;
+    }
+    if (price.interval === 'year' && price.interval_count >= 1) {
+      return price;
+    }
+  });
+}
+
+function findMonthlyPrice(prices: Price[]) {
+  return prices.find(price => {
+    if (price.interval === 'day' && price.interval_count >= 30) {
+      return price;
+    }
+    if (price.interval === 'month' && price.interval_count >= 1) {
+      return price;
+    }
+  });
+}