From f321602034a5a68f6cd7171deb440ccee1314df9 Mon Sep 17 00:00:00 2001
From: Diana Olarte <diana.olarte@edunext.co>
Date: Wed, 11 Dec 2024 13:14:40 +1100
Subject: [PATCH] feat: create a footer lang selector

---
 README.rst                          | 17 +++----------
 src/components/Footer.jsx           | 22 +++++-----------
 src/components/Footer.test.jsx      | 39 ++++++++++++++++++-----------
 src/components/LanguageSelector.jsx | 32 ++++++++++++++++++++---
 src/components/data/api.js          | 32 +++++++++++++++++++++++
 5 files changed, 93 insertions(+), 49 deletions(-)
 create mode 100644 src/components/data/api.js

diff --git a/README.rst b/README.rst
index 32a1e5feb..0bcb02a8f 100644
--- a/README.rst
+++ b/README.rst
@@ -49,7 +49,8 @@ Optionally, use the following variables to configure the Terms of Service Modal
 * ``PRIVACY_POLICY_URL`` - The URL for the privacy policy.
 * ``TERMS_OF_SERVICE_URL`` - The URL for the terms of service.
 * ``TOS_AND_HONOR_CODE`` - The URL for the honor code.
-
+* ``ENABLE_FOOTER_LANG_SELECTOR`` - A boolean to enable the lnaguage selector in the footer component.
+* ``SITE_SUPPORTED_LENGUAGES`` - A list with all the languages to display in the selector.
 
 Installation
 ============
@@ -94,12 +95,6 @@ This library has the following exports:
 * ``messages``: Internationalization messages suitable for use with `@edx/frontend-platform/i18n <https://edx.github.io/frontend-platform/module-Internationalization.html>`_
 * ``dist/footer.scss``: A SASS file which contains style information for the component.  It should be imported into the micro-frontend's own SCSS file.
 
-<Footer /> component props
-==========================
-
-* onLanguageSelected: Provides the footer with an event handler for when the user selects a
-  language from its dropdown.
-* supportedLanguages: An array of objects representing available languages.  See example below for object shape.
 
 Terms of Service Modal
 =======================
@@ -156,13 +151,7 @@ Component Usage Example::
 
   ...
 
-  <Footer
-    onLanguageSelected={(languageCode) => {/* set language */}}
-    supportedLanguages={[
-      { label: 'English', value: 'en'},
-      { label: 'Español', value: 'es' },
-    ]}
-  />
+  <Footer />
 
 * `An example of minimal component and messages usage. <https://github.com/openedx/frontend-template-application/blob/3355bb3a96232390e9056f35b06ffa8f105ed7ca/src/index.jsx#L23>`_
 * `An example of SCSS file usage. <https://github.com/openedx/frontend-template-application/blob/3cd5485bf387b8c479baf6b02bf59e3061dc3465/src/index.scss#L9>`_
diff --git a/src/components/Footer.jsx b/src/components/Footer.jsx
index 475287c92..c149d04e8 100644
--- a/src/components/Footer.jsx
+++ b/src/components/Footer.jsx
@@ -113,13 +113,10 @@ class SiteFooter extends React.Component {
 
   render() {
     const {
-      supportedLanguages,
-      onLanguageSelected,
       logo,
       intl,
     } = this.props;
-    const showLanguageSelector = supportedLanguages.length > 0 && onLanguageSelected;
-    const { config } = this.context;
+    const { config, authenticatedUser } = this.context;
 
     return (
       <footer
@@ -145,18 +142,18 @@ class SiteFooter extends React.Component {
             </div>
             <FooterLinks intl={intl} />
 
-            {showLanguageSelector && (
+            {config.ENABLE_FOOTER_LANG_SELECTOR && (
               <LanguageSelector
-                options={supportedLanguages}
-                onSubmit={onLanguageSelected}
+                options={config.SITE_SUPPORTED_LENGUAGES}
+                authenticatedUser={authenticatedUser}
               />
             )}
           </div>
         </section>
         <AdditionalLogosSection />
         {
-        config.MODAL_UPDATE_TERMS_OF_SERVICE && <ModalToS />
-       }
+          config.MODAL_UPDATE_TERMS_OF_SERVICE && <ModalToS />
+        }
       </footer>
     );
   }
@@ -167,17 +164,10 @@ SiteFooter.contextType = AppContext;
 SiteFooter.propTypes = {
   intl: intlShape.isRequired,
   logo: PropTypes.string,
-  onLanguageSelected: PropTypes.func,
-  supportedLanguages: PropTypes.arrayOf(PropTypes.shape({
-    label: PropTypes.string.isRequired,
-    value: PropTypes.string.isRequired,
-  })),
 };
 
 SiteFooter.defaultProps = {
   logo: undefined,
-  onLanguageSelected: undefined,
-  supportedLanguages: [],
 };
 
 export default injectIntl(SiteFooter);
diff --git a/src/components/Footer.test.jsx b/src/components/Footer.test.jsx
index 98aea2c8a..010055eb7 100644
--- a/src/components/Footer.test.jsx
+++ b/src/components/Footer.test.jsx
@@ -2,17 +2,26 @@
 import React, { useMemo } from 'react';
 import renderer from 'react-test-renderer';
 import { render, fireEvent, screen } from '@testing-library/react';
+import { initializeMockApp } from '@edx/frontend-platform';
 import { IntlProvider } from '@edx/frontend-platform/i18n';
 import { AppContext } from '@edx/frontend-platform/react';
 
 import Footer from './Footer';
 
+import { patchPreferences, postSetLang } from './data/api';
+
+jest.mock('./data/api', () => ({
+  patchPreferences: jest.fn(),
+  postSetLang: jest.fn(),
+}));
+
 const FooterWithContext = ({ locale = 'pt-pt' }) => {
   const contextValue = useMemo(() => ({
     authenticatedUser: null,
     config: {
       LOGO_TRADEMARK_URL: process.env.LOGO_TRADEMARK_URL,
       LMS_BASE_URL: process.env.LMS_BASE_URL,
+      SITE_NAME: process.env.SITE_NAME,
     },
   }), []);
 
@@ -27,12 +36,18 @@ const FooterWithContext = ({ locale = 'pt-pt' }) => {
   );
 };
 
-const FooterWithLanguageSelector = ({ languageSelected = () => {} }) => {
+const FooterWithLanguageSelector = () => {
   const contextValue = useMemo(() => ({
-    authenticatedUser: null,
+    authenticatedUser: { username: 'user123' },
     config: {
       LOGO_TRADEMARK_URL: process.env.LOGO_TRADEMARK_URL,
       LMS_BASE_URL: process.env.LMS_BASE_URL,
+      SITE_NAME: process.env.SITE_NAME,
+      ENABLE_FOOTER_LANG_SELECTOR: true,
+      SITE_SUPPORTED_LENGUAGES: [
+        { label: 'English', value: 'en' },
+        { label: 'Português', value: 'pt-pt' },
+      ],
     },
   }), []);
 
@@ -41,13 +56,7 @@ const FooterWithLanguageSelector = ({ languageSelected = () => {} }) => {
       <AppContext.Provider
         value={contextValue}
       >
-        <Footer
-          onLanguageSelected={languageSelected}
-          supportedLanguages={[
-            { label: 'English', value: 'en' },
-            { label: 'Português', value: 'pt-pt' },
-          ]}
-        />
+        <Footer />
       </AppContext.Provider>
     </IntlProvider>
   );
@@ -76,11 +85,11 @@ describe('<Footer />', () => {
   });
 
   describe('handles language switching', () => {
-    it('calls onLanguageSelected prop when a language is changed', () => {
-      const mockHandleLanguageSelected = jest.fn();
-      render(<FooterWithLanguageSelector languageSelected={mockHandleLanguageSelected} />);
+    it('calls patchPreferences and postSetLang when a language is changed', async () => {
+      initializeMockApp();
+      render(<FooterWithLanguageSelector />);
 
-      fireEvent.submit(screen.getByTestId('site-footer-submit-btn'), {
+      await fireEvent.submit(screen.getByTestId('site-footer-submit-btn'), {
         target: {
           elements: {
             'site-footer-language-select': {
@@ -89,8 +98,8 @@ describe('<Footer />', () => {
           },
         },
       });
-
-      expect(mockHandleLanguageSelected).toHaveBeenCalledWith('pt-pt');
+      expect(patchPreferences).toHaveBeenCalledWith('user123', { prefLang: 'pt-pt' });
+      expect(postSetLang).toHaveBeenCalledWith('pt-pt');
     });
   });
 });
diff --git a/src/components/LanguageSelector.jsx b/src/components/LanguageSelector.jsx
index 1e8e1ad19..be7335129 100644
--- a/src/components/LanguageSelector.jsx
+++ b/src/components/LanguageSelector.jsx
@@ -1,14 +1,36 @@
 import React from 'react';
 import PropTypes from 'prop-types';
-import { injectIntl, intlShape, FormattedMessage } from '@edx/frontend-platform/i18n';
+import { publish } from '@edx/frontend-platform';
+import {
+  getLocale, injectIntl, intlShape, FormattedMessage, LOCALE_CHANGED, handleRtl,
+} from '@edx/frontend-platform/i18n';
+import { logError } from '@edx/frontend-platform/logging';
+
+import { patchPreferences, postSetLang } from './data/api';
+
+const onLanguageSelected = async (username, selectedLanguageCode) => {
+  try {
+    if (username) {
+      await patchPreferences(username, { prefLang: selectedLanguageCode });
+      await postSetLang(selectedLanguageCode);
+    }
+    publish(LOCALE_CHANGED, getLocale());
+    handleRtl();
+  } catch (error) {
+    logError(error);
+  }
+};
 
 const LanguageSelector = ({
-  intl, options, onSubmit, ...props
+  intl, options, authenticatedUser, ...props
 }) => {
   const handleSubmit = (e) => {
     e.preventDefault();
+    const previousSiteLanguage = getLocale();
     const languageCode = e.target.elements['site-footer-language-select'].value;
-    onSubmit(languageCode);
+    if (previousSiteLanguage !== languageCode) {
+      onLanguageSelected(authenticatedUser?.username, languageCode);
+    }
   };
 
   return (
@@ -47,8 +69,10 @@ const LanguageSelector = ({
 };
 
 LanguageSelector.propTypes = {
+  authenticatedUser: PropTypes.shape({
+    username: PropTypes.string,
+  }).isRequired,
   intl: intlShape.isRequired,
-  onSubmit: PropTypes.func.isRequired,
   options: PropTypes.arrayOf(PropTypes.shape({
     value: PropTypes.string,
     label: PropTypes.string,
diff --git a/src/components/data/api.js b/src/components/data/api.js
new file mode 100644
index 000000000..0ec420007
--- /dev/null
+++ b/src/components/data/api.js
@@ -0,0 +1,32 @@
+import { getConfig } from '@edx/frontend-platform';
+import { getAuthenticatedHttpClient } from '@edx/frontend-platform/auth';
+import { convertKeyNames, snakeCaseObject } from '@edx/frontend-platform/utils';
+
+export async function patchPreferences(username, params) {
+  let processedParams = snakeCaseObject(params);
+  processedParams = convertKeyNames(processedParams, {
+    pref_lang: 'pref-lang',
+  });
+
+  await getAuthenticatedHttpClient()
+    .patch(`${getConfig().LMS_BASE_URL}/api/user/v1/preferences/${username}`, processedParams, {
+      headers: { 'Content-Type': 'application/merge-patch+json' },
+    });
+
+  return params;
+}
+
+export async function postSetLang(code) {
+  const formData = new FormData();
+  const requestConfig = {
+    headers: {
+      Accept: 'application/json',
+      'X-Requested-With': 'XMLHttpRequest',
+    },
+  };
+  const url = `${getConfig().LMS_BASE_URL}/i18n/setlang/`;
+  formData.append('language', code);
+
+  await getAuthenticatedHttpClient()
+    .post(url, formData, requestConfig);
+}