feat: use discount info endpoint for streak discount information (#1763)

* feat: use discount info endpoint for streak discount information

* feat: pass course run key to discount code info call

* feat: move changes behind a flag

* fix: use async IIFE inside useEffect

* fix: fix line length

* fix: remove default value in dev

* fix: improve coverage by adding conditional test based on env value

* refactor: move logic inside function

* refactor: move functions to utils

* fix: ignore merge config

.env

@@ -12,6 +12,7 @@ CREDIT_HELP_LINK_URL=''
 CSRF_TOKEN_API_PATH=''
 DISCOVERY_API_BASE_URL=''
 DISCUSSIONS_MFE_BASE_URL=''
+DISCOUNT_CODE_INFO_URL=''
 ECOMMERCE_BASE_URL=''
 ENABLE_JUMPNAV='true'
 ENABLE_NOTICES=''

.env.development

@@ -12,6 +12,7 @@ CREDIT_HELP_LINK_URL='https://help.edx.org/edxlearner/s/article/Can-I-receive-co
 CSRF_TOKEN_API_PATH='/csrf/api/v1/token'
 DISCOVERY_API_BASE_URL='http://localhost:18381'
 DISCUSSIONS_MFE_BASE_URL='http://localhost:2002'
+DISCOUNT_CODE_INFO_URL=''
 ECOMMERCE_BASE_URL='http://localhost:18130'
 ENABLE_JUMPNAV='true'
 ENABLE_NOTICES=''

.env.test

@@ -12,6 +12,7 @@ CREDIT_HELP_LINK_URL='https://help.edx.org/edxlearner/s/article/Can-I-receive-co
 CSRF_TOKEN_API_PATH='/csrf/api/v1/token'
 DISCOVERY_API_BASE_URL='http://localhost:18381'
 DISCUSSIONS_MFE_BASE_URL='http://localhost:2002'
+DISCOUNT_CODE_INFO_URL=''
 ECOMMERCE_BASE_URL='http://localhost:18130'
 ENABLE_JUMPNAV='true'
 ENABLE_NOTICES=''

src/index.jsx

@@ -166,11 +166,13 @@ subscribe(APP_INIT_ERROR, (error) => {
 initialize({
   handlers: {
     config: () => {
+      /* istanbul ignore next */
       mergeConfig({
         CONTACT_URL: process.env.CONTACT_URL || null,
         CREDENTIALS_BASE_URL: process.env.CREDENTIALS_BASE_URL || null,
         CREDIT_HELP_LINK_URL: process.env.CREDIT_HELP_LINK_URL || null,
         DISCUSSIONS_MFE_BASE_URL: process.env.DISCUSSIONS_MFE_BASE_URL || null,
+        DISCOUNT_CODE_INFO_URL: process.env.DISCOUNT_CODE_INFO_URL || null,
         ENTERPRISE_LEARNER_PORTAL_HOSTNAME: process.env.ENTERPRISE_LEARNER_PORTAL_HOSTNAME || null,
         ENTERPRISE_LEARNER_PORTAL_URL: process.env.ENTERPRISE_LEARNER_PORTAL_URL || null,
         ENABLE_JUMPNAV: process.env.ENABLE_JUMPNAV || null,

src/shared/streak-celebration/StreakCelebrationModal.jsx

@@ -1,9 +1,8 @@
 /* eslint-disable react/prop-types */
 import React, { useEffect, useState } from 'react';
 import PropTypes from 'prop-types';
-import { camelCaseObject, getConfig } from '@edx/frontend-platform';
+import { getConfig } from '@edx/frontend-platform';
 import { sendTrackEvent } from '@edx/frontend-platform/analytics';
-import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
 import { FormattedMessage, useIntl } from '@edx/frontend-platform/i18n';
 import { Lightbulb, MoneyFilled } from '@openedx/paragon/icons';
 import {
@@ -16,7 +15,12 @@ import { useModel } from '../../generic/model-store';
 import StreakMobileImage from './assets/Streak_mobile.png';
 import StreakDesktopImage from './assets/Streak_desktop.png';
 import messages from './messages';
-import { recordModalClosing, recordStreakCelebration } from './utils';
+import {
+  calculateVoucherDiscountPercentage,
+  getDiscountCodePercentage,
+  recordModalClosing,
+  recordStreakCelebration,
+} from './utils';
 
 function getRandomFactoid(intl, streakLength) {
   const boldedSectionA = intl.formatMessage(messages.streakFactoidABoldedSection);
@@ -42,13 +46,6 @@ function getRandomFactoid(intl, streakLength) {
   return factoids[Math.floor(Math.random() * (factoids.length))];
 }
 
-async function calculateVoucherDiscount(voucher, sku, username) {
-  const urlBase = `${getConfig().ECOMMERCE_BASE_URL}/api/v2/baskets/calculate`;
-  const url = `${urlBase}/?code=${voucher}&sku=${sku}&username=${username}`;
-  return getAuthenticatedHttpClient().get(url)
-    .then(res => camelCaseObject(res));
-}
-
 const CloseText = ({ intl }) => (
   <span>
     {intl.formatMessage(messages.streakButton)}
@@ -83,34 +80,38 @@ const StreakModal = ({
 
   // Ask ecommerce to calculate discount savings
   useEffect(() => {
-    if (streakDiscountCouponEnabled && verifiedMode && getConfig().ECOMMERCE_BASE_URL) {
-      calculateVoucherDiscount(discountCode, verifiedMode.sku, username)
-        .then(
-          (result) => {
-            const { totalInclTax, totalInclTaxExclDiscounts } = result.data;
-            if (totalInclTaxExclDiscounts && totalInclTax !== totalInclTaxExclDiscounts) {
-              // Just store the percent (rather than using these values directly), because ecommerce doesn't give us
-              // the currency symbol to use, so we want to use the symbol that LMS gives us. And I don't want to assume
-              // ecommerce's currency is the same as the LMS. So we'll keep using the values in verifiedMode, just
-              // multiplied by the calculated percentage.
-              setDiscountPercent(1 - totalInclTax / totalInclTaxExclDiscounts);
-              sendTrackEvent('edx.bi.course.streak_discount_enabled', {
-                course_id: courseId,
-                sku: verifiedMode.sku,
-              });
-            } else {
-              setDiscountPercent(0);
-            }
-          },
-          () => {
-            // ignore any errors - we just won't show the discount to the user then
-            setDiscountPercent(0);
-          },
-        );
-    } else {
-      setDiscountPercent(0);
-    }
-  // eslint-disable-next-line react-hooks/exhaustive-deps
+    (async () => {
+      let streakDiscountPercentage = 0;
+      try {
+        if (streakDiscountCouponEnabled && verifiedMode) {
+          // If the discount service is available, use it to get the discount percentage
+          if (getConfig().DISCOUNT_CODE_INFO_URL) {
+            streakDiscountPercentage = await getDiscountCodePercentage(
+              discountCode,
+              courseId,
+            );
+          // If the discount service is not available, fall back to ecommerce to calculate the discount percentage
+          } else if (getConfig().ECOMMERCE_BASE_URL) {
+            streakDiscountPercentage = await calculateVoucherDiscountPercentage(
+              discountCode,
+              verifiedMode.sku,
+              username,
+            );
+          }
+        }
+      } catch {
+        // ignore any errors - we just won't show the discount to the user then
+      } finally {
+        if (streakDiscountPercentage) {
+          sendTrackEvent('edx.bi.course.streak_discount_enabled', {
+            course_id: courseId,
+            sku: verifiedMode.sku,
+          });
+        }
+        setDiscountPercent(streakDiscountPercentage);
+      }
+    })();
+    // eslint-disable-next-line react-hooks/exhaustive-deps
   }, [streakDiscountCouponEnabled, username, verifiedMode]);
 
   if (!isStreakCelebrationOpen) {

src/shared/streak-celebration/StreakCelebrationModal.test.jsx

@@ -1,6 +1,6 @@
 import React from 'react';
 import { Factory } from 'rosie';
-import { camelCaseObject, getConfig } from '@edx/frontend-platform';
+import { camelCaseObject, getConfig, mergeConfig } from '@edx/frontend-platform';
 import { sendTrackEvent } from '@edx/frontend-platform/analytics';
 import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
 import { breakpoints } from '@openedx/paragon';
@@ -34,6 +34,19 @@ describe('Loaded Tab Page', () => {
     });
   }
 
+  function setDiscountViaDiscountCodeInfo(percent) {
+    const discountURLParams = new URLSearchParams();
+    discountURLParams.append('code', 'ZGY11119949');
+    discountURLParams.append('course_run_key', courseMetadata.id);
+    const discountURL = `${getConfig().DISCOUNT_CODE_INFO_URL}?${discountURLParams.toString()}`;
+
+    mockData.streakDiscountCouponEnabled = true;
+    axiosMock.onGet(discountURL).reply(200, {
+      isApplicable: true,
+      discountPercentage: percent / 100,
+    });
+  }
+
   function setDiscountError() {
     mockData.streakDiscountCouponEnabled = true;
     axiosMock.onGet(calculateUrl).reply(500);
@@ -105,4 +118,22 @@ describe('Loaded Tab Page', () => {
       sku: mockData.verifiedMode.sku,
     });
   });
+
+  it('shows discount version of streak celebration modal when discount available and info fetched using DISCOUNT_CODE_INFO_URL', async () => {
+    mergeConfig({ DISCOUNT_CODE_INFO_URL: 'http://localhost:8140/lms/discount-code-info/' });
+
+    global.innerWidth = breakpoints.extraSmall.maxWidth;
+    setDiscountViaDiscountCodeInfo(14);
+    await renderModal();
+
+    const endDateText = `Ends ${new Date(Date.now() + 14 * 24 * 60 * 60 * 1000).toLocaleDateString({ timeZone: 'UTC' })}.`;
+    expect(screen.getByText('You’ve unlocked a 14% off discount when you upgrade this course for a limited time only.', { exact: false })).toBeInTheDocument();
+    expect(screen.getByText(endDateText, { exact: false })).toBeInTheDocument();
+    expect(screen.getByText('Continue with course')).toBeInTheDocument();
+    expect(screen.queryByText('Keep it up')).not.toBeInTheDocument();
+    expect(sendTrackEvent).toHaveBeenCalledWith('edx.bi.course.streak_discount_enabled', {
+      course_id: mockData.courseId,
+      sku: mockData.verifiedMode.sku,
+    });
+  });
 });

src/shared/streak-celebration/utils.jsx

@@ -1,5 +1,9 @@
 import { sendTrackEvent } from '@edx/frontend-platform/analytics';
-import { getAuthenticatedUser } from '@edx/frontend-platform/auth';
+import { camelCaseObject, getConfig } from '@edx/frontend-platform';
+import {
+  getAuthenticatedHttpClient,
+  getAuthenticatedUser,
+} from '@edx/frontend-platform/auth';
 
 import { updateModel } from '../../generic/model-store';
 
@@ -24,4 +28,39 @@ function recordModalClosing(celebrations, org, courseId, dispatch) {
   }));
 }
 
-export { recordStreakCelebration, recordModalClosing };
+async function calculateVoucherDiscountPercentage(voucher, sku, username) {
+  const urlBase = `${getConfig().ECOMMERCE_BASE_URL}/api/v2/baskets/calculate`;
+  const url = `${urlBase}/?code=${voucher}&sku=${sku}&username=${username}`;
+
+  const result = await getAuthenticatedHttpClient().get(url);
+  const { totalInclTax, totalInclTaxExclDiscounts } = camelCaseObject(result).data;
+
+  if (totalInclTaxExclDiscounts && totalInclTax !== totalInclTaxExclDiscounts) {
+    // Just store the percent (rather than using these values directly), because ecommerce doesn't give us
+    // the currency symbol to use, so we want to use the symbol that LMS gives us. And I don't want to assume
+    // ecommerce's currency is the same as the LMS. So we'll keep using the values in verifiedMode, just
+    // multiplied by the calculated percentage.
+    return 1 - totalInclTax / totalInclTaxExclDiscounts;
+  }
+
+  return 0;
+}
+
+async function getDiscountCodePercentage(code, courseId) {
+  const params = new URLSearchParams();
+  params.append('code', code);
+  params.append('course_run_key', courseId);
+  const url = `${getConfig().DISCOUNT_CODE_INFO_URL}?${params.toString()}`;
+
+  const result = await getAuthenticatedHttpClient().get(url);
+  const { isApplicable, discountPercentage } = camelCaseObject(result).data;
+
+  return isApplicable ? +discountPercentage : 0;
+}
+
+export {
+  calculateVoucherDiscountPercentage,
+  getDiscountCodePercentage,
+  recordModalClosing,
+  recordStreakCelebration,
+};