feat(payment): share payment method selector

src/lib/payment/__tests__/payment_method.test.ts

@@ -0,0 +1,65 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { getDefaultPayChannelForCountryCode } from "../default_pay_channel";
+import {
+  canChoosePayChannel,
+  getPaymentMethodConfig,
+  resolvePayChannel,
+} from "../payment_method";
+
+describe("payment method rules", () => {
+  afterEach(() => {
+    vi.unstubAllEnvs();
+  });
+
+  it("defaults Philippines users to GCash and other countries to Stripe", () => {
+    expect(getDefaultPayChannelForCountryCode("PH")).toBe("ezpay");
+    expect(getDefaultPayChannelForCountryCode("ph")).toBe("ezpay");
+    expect(getDefaultPayChannelForCountryCode("HK")).toBe("stripe");
+    expect(getDefaultPayChannelForCountryCode(null)).toBe("stripe");
+  });
+
+  it("only allows Philippines users to choose in production", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
+
+    expect(canChoosePayChannel("PH")).toBe(true);
+    expect(canChoosePayChannel("ph")).toBe(true);
+    expect(canChoosePayChannel("HK")).toBe(false);
+    expect(canChoosePayChannel(null)).toBe(false);
+    expect(
+      getPaymentMethodConfig({
+        countryCode: null,
+        requestedPayChannel: "ezpay",
+      }),
+    ).toEqual({
+      canChoosePaymentMethod: false,
+      initialPayChannel: "stripe",
+    });
+  });
+
+  it("resolves requested and default channels for Philippines", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "production");
+
+    expect(
+      resolvePayChannel({ countryCode: "PH", requestedPayChannel: null }),
+    ).toBe("ezpay");
+    expect(
+      resolvePayChannel({
+        countryCode: "PH",
+        requestedPayChannel: "stripe",
+      }),
+    ).toBe("stripe");
+  });
+
+  it("allows every user and keeps the requested channel outside production", () => {
+    vi.stubEnv("NEXT_PUBLIC_APP_ENV", "test");
+
+    expect(canChoosePayChannel(null)).toBe(true);
+    expect(
+      resolvePayChannel({
+        countryCode: "HK",
+        requestedPayChannel: "ezpay",
+      }),
+    ).toBe("ezpay");
+  });
+});

src/lib/payment/payment_method.ts

@@ -0,0 +1,37 @@
+import type { PayChannel } from "@/data/schemas/payment";
+import { AppEnvUtil } from "@/utils/app-env";
+
+import { getDefaultPayChannelForCountryCode } from "./default_pay_channel";
+
+export interface PaymentMethodConfig {
+  canChoosePaymentMethod: boolean;
+  initialPayChannel: PayChannel;
+}
+
+export function canChoosePayChannel(
+  countryCode: string | null | undefined,
+): boolean {
+  if (!AppEnvUtil.isProduction()) return true;
+  return countryCode?.trim().toUpperCase() === "PH";
+}
+
+export function resolvePayChannel(input: {
+  countryCode: string | null | undefined;
+  requestedPayChannel: PayChannel | null | undefined;
+}): PayChannel {
+  if (!canChoosePayChannel(input.countryCode)) return "stripe";
+  return (
+    input.requestedPayChannel ??
+    getDefaultPayChannelForCountryCode(input.countryCode)
+  );
+}
+
+export function getPaymentMethodConfig(input: {
+  countryCode: string | null | undefined;
+  requestedPayChannel: PayChannel | null | undefined;
+}): PaymentMethodConfig {
+  return {
+    canChoosePaymentMethod: canChoosePayChannel(input.countryCode),
+    initialPayChannel: resolvePayChannel(input),
+  };
+}