feat(ws): add namespace dropdown to UI

workspaces/frontend/src/__mocks__/mockNamespaces.ts

@@ -1,5 +1,7 @@
 import { NamespacesList } from '~/app/types';
 
-export const mockNamespaces = (): NamespacesList => ({
-  data: [{ name: 'default' }, { name: 'kubeflow' }, { name: 'custom-namespace' }],
-});
+export const mockNamespaces: NamespacesList = [
+  { name: 'default' },
+  { name: 'kubeflow' },
+  { name: 'custom-namespace' },
+];

workspaces/frontend/src/__tests__/cypress/cypress/tests/e2e/NamespaceSelector.cy.ts

@@ -0,0 +1,57 @@
+import { mockNamespaces } from '~/__mocks__/mockNamespaces';
+import { mockBFFResponse } from '~/__mocks__/utils';
+
+const namespaces = ['default', 'kubeflow', 'custom-namespace'];
+
+describe('Namespace Selector Dropdown', () => {
+  beforeEach(() => {
+    // Mock the namespaces API response
+    cy.intercept('GET', '/api/v1/namespaces', {
+      body: mockBFFResponse(mockNamespaces),
+    }).as('getNamespaces');
+    cy.visit('/');
+    cy.wait('@getNamespaces');
+  });
+
+  it('should open the namespace dropdown and select a namespace', () => {
+    cy.findByTestId('namespace-toggle').click();
+    cy.findByTestId('namespace-dropdown').should('be.visible');
+    namespaces.forEach((ns) => {
+      cy.findByTestId(`dropdown-item-${ns}`).should('exist').and('contain', ns);
+    });
+
+    cy.findByTestId('dropdown-item-kubeflow').click();
+
+    // Assert the selected namespace is updated
+    cy.findByTestId('namespace-toggle').should('contain', 'kubeflow');
+  });
+
+  it('should display the default namespace initially', () => {
+    cy.findByTestId('namespace-toggle').should('contain', 'default');
+  });
+
+  it('should navigate to notebook settings and retain the namespace', () => {
+    cy.findByTestId('namespace-toggle').click();
+    cy.findByTestId('dropdown-item-custom-namespace').click();
+    cy.findByTestId('namespace-toggle').should('contain', 'custom-namespace');
+    // Click on navigation button
+    cy.get('#Settings').click();
+    cy.findByTestId('nav-link-/notebookSettings').click();
+    cy.findByTestId('namespace-toggle').should('contain', 'custom-namespace');
+  });
+
+  it('should filter namespaces based on search input', () => {
+    cy.findByTestId('namespace-toggle').click();
+    cy.findByTestId('namespace-search-input').type('custom');
+    cy.findByTestId('namespace-search-input').find('input').should('have.value', 'custom');
+    cy.findByTestId('namespace-search-button').click();
+    // Verify that only the matching namespace is displayed
+    namespaces.forEach((ns) => {
+      if (ns === 'custom-namespace') {
+        cy.findByTestId(`dropdown-item-${ns}`).should('exist').and('contain', ns);
+      } else {
+        cy.findByTestId(`dropdown-item-${ns}`).should('not.exist');
+      }
+    });
+  });
+});

workspaces/frontend/src/__tests__/cypress/cypress/tests/mocked/application.cy.ts

@@ -1,7 +1,18 @@
 import { pageNotfound } from '~/__tests__/cypress/cypress/pages/pageNotFound';
 import { home } from '~/__tests__/cypress/cypress/pages/home';
+import { mockNamespaces } from '~/__mocks__/mockNamespaces';
+import { mockBFFResponse } from '~/__mocks__/utils';
 
 describe('Application', () => {
+  beforeEach(() => {
+    // Mock the namespaces API response
+    cy.intercept('GET', '/api/v1/namespaces', {
+      body: mockBFFResponse(mockNamespaces),
+    }).as('getNamespaces');
+    cy.visit('/');
+    cy.wait('@getNamespaces');
+  });
+
   it('Page not found should render', () => {
     pageNotfound.visit();
   });

workspaces/frontend/src/app/App.tsx

@@ -11,6 +11,8 @@ import {
   Title,
 } from '@patternfly/react-core';
 import { BarsIcon } from '@patternfly/react-icons';
+import NamespaceSelector from '~/shared/components/NamespaceSelector';
+import { NamespaceContextProvider } from './context/NamespaceContextProvider';
 import AppRoutes from './AppRoutes';
 import NavSidebar from './NavSidebar';
 import { NotebookContextProvider } from './context/NotebookContext';
@@ -29,21 +31,24 @@ const App: React.FC = () => {
           <Title headingLevel="h2" size="3xl">
             Kubeflow Notebooks 2.0
           </Title>
+          <NamespaceSelector />
         </Flex>
       </MastheadContent>
     </Masthead>
   );
 
   return (
     <NotebookContextProvider>
-      <Page
-        mainContainerId="primary-app-container"
-        masthead={masthead}
-        isManagedSidebar
-        sidebar={<NavSidebar />}
-      >
-        <AppRoutes />
-      </Page>
+      <NamespaceContextProvider>
+        <Page
+          mainContainerId="primary-app-container"
+          masthead={masthead}
+          isManagedSidebar
+          sidebar={<NavSidebar />}
+        >
+          <AppRoutes />
+        </Page>
+      </NamespaceContextProvider>
     </NotebookContextProvider>
   );
 };

workspaces/frontend/src/app/NavSidebar.tsx

@@ -12,7 +12,9 @@ import { useNavData, isNavDataGroup, NavDataHref, NavDataGroup } from './AppRout
 
 const NavHref: React.FC<{ item: NavDataHref }> = ({ item }) => (
   <NavItem key={item.label} data-id={item.label} itemId={item.label}>
-    <NavLink to={item.path}>{item.label}</NavLink>
+    <NavLink to={item.path} data-testid={`nav-link-${item.path}`}>
+      {item.label}
+    </NavLink>
   </NavItem>
 );
 
@@ -40,7 +42,6 @@ const NavGroup: React.FC<{ item: NavDataGroup }> = ({ item }) => {
 
 const NavSidebar: React.FC = () => {
   const navData = useNavData();
-
   return (
     <PageSidebar>
       <PageSidebarBody>

workspaces/frontend/src/app/context/NamespaceContextProvider.tsx

@@ -0,0 +1,56 @@
+import React, { useState, useContext, ReactNode, useMemo, useCallback } from 'react';
+import useMount from '~/app/hooks/useMount';
+import useNamespaces from '~/app/hooks/useNamespaces';
+
+interface NamespaceContextType {
+  namespaces: string[];
+  selectedNamespace: string;
+  setSelectedNamespace: (namespace: string) => void;
+}
+
+const NamespaceContext = React.createContext<NamespaceContextType | undefined>(undefined);
+
+export const useNamespaceContext = (): NamespaceContextType => {
+  const context = useContext(NamespaceContext);
+  if (!context) {
+    throw new Error('useNamespaceContext must be used within a NamespaceContextProvider');
+  }
+  return context;
+};
+
+interface NamespaceContextProviderProps {
+  children: ReactNode;
+}
+
+export const NamespaceContextProvider: React.FC<NamespaceContextProviderProps> = ({ children }) => {
+  const [namespaces, setNamespaces] = useState<string[]>([]);
+  const [selectedNamespace, setSelectedNamespace] = useState<string>('');
+  const [namespacesData, loaded, loadError] = useNamespaces();
+
+  const fetchNamespaces = useCallback(() => {
+    if (loaded && namespacesData) {
+      const namespaceNames = namespacesData.map((ns) => ns.name);
+      setNamespaces(namespaceNames);
+      setSelectedNamespace(namespaceNames.length > 0 ? namespaceNames[0] : '');
+    } else {
+      if (loadError) {
+        console.error('Error loading namespaces: ', loadError);
+      }
+      setNamespaces([]);
+      setSelectedNamespace('');
+    }
+  }, [loaded, namespacesData, loadError]);
+
+  useMount(fetchNamespaces);
+
+  const namespacesContextValues = useMemo(
+    () => ({ namespaces, selectedNamespace, setSelectedNamespace }),
+    [namespaces, selectedNamespace],
+  );
+
+  return (
+    <NamespaceContext.Provider value={namespacesContextValues}>
+      {children}
+    </NamespaceContext.Provider>
+  );
+};

workspaces/frontend/src/app/context/NotebookContext.tsx

@@ -14,7 +14,7 @@ export const NotebookContext = React.createContext<NotebookContextType>({
 });
 
 export const NotebookContextProvider: React.FC = ({ children }) => {
-  const hostPath = `/api/${BFF_API_VERSION}/`;
+  const hostPath = `/api/${BFF_API_VERSION}`;
 
   const [apiState, refreshAPIState] = useNotebookAPIState(hostPath);
 

workspaces/frontend/src/app/hooks/useMount.tsx

@@ -0,0 +1,9 @@
+import { useEffect } from 'react';
+
+const useMount = (callback: () => void): void => {
+  useEffect(() => {
+    callback();
+  }, [callback]);
+};
+
+export default useMount;

workspaces/frontend/src/app/types.ts

@@ -60,9 +60,7 @@ export type Namespace = {
   name: string;
 };
 
-export type NamespacesList = {
-  data: Namespace[];
-};
+export type NamespacesList = Namespace[];
 
 export type GetNamespaces = (opts: APIOptions) => Promise<NamespacesList>;
 

workspaces/frontend/src/shared/api/__tests__/notebookService.spec.ts

@@ -23,12 +23,12 @@ const APIOptionsMock = {};
 
 describe('getNamespaces', () => {
   it('should call restGET and handleRestFailures to fetch namespaces', async () => {
-    const response = await getNamespaces(`/api/${BFF_API_VERSION}/namespaces/`)(APIOptionsMock);
+    const response = await getNamespaces(`/api/${BFF_API_VERSION}/namespaces`)(APIOptionsMock);
     expect(response).toEqual(mockRestResponse);
     expect(restGETMock).toHaveBeenCalledTimes(1);
     expect(restGETMock).toHaveBeenCalledWith(
-      `/api/${BFF_API_VERSION}/namespaces/`,
-      `/namespaces/`,
+      `/api/${BFF_API_VERSION}/namespaces`,
+      `/namespaces`,
       {},
       APIOptionsMock,
     );

workspaces/frontend/src/shared/api/notebookService.ts

@@ -6,7 +6,7 @@ import { handleRestFailures } from '~/shared/api/errorUtils';
 export const getNamespaces =
   (hostPath: string) =>
   (opts: APIOptions): Promise<NamespacesList> =>
-    handleRestFailures(restGET(hostPath, `/namespaces/`, {}, opts)).then((response) => {
+    handleRestFailures(restGET(hostPath, `/namespaces`, {}, opts)).then((response) => {
       if (isNotebookResponse<NamespacesList>(response)) {
         return response.data;
       }

workspaces/frontend/src/shared/components/NamespaceSelector.tsx

@@ -0,0 +1,135 @@
+import React, { FC, useMemo, useState, useEffect } from 'react';
+import {
+  Dropdown,
+  DropdownItem,
+  MenuToggle,
+  DropdownList,
+  DropdownProps,
+  MenuSearch,
+  MenuSearchInput,
+  InputGroup,
+  InputGroupItem,
+  SearchInput,
+  Button,
+  ButtonVariant,
+  Divider,
+} from '@patternfly/react-core';
+import { SearchIcon } from '@patternfly/react-icons/dist/esm/icons/search-icon';
+import { useNamespaceContext } from '~/app/context/NamespaceContextProvider';
+
+const NamespaceSelector: FC = () => {
+  const { namespaces, selectedNamespace, setSelectedNamespace } = useNamespaceContext();
+  const [isNamespaceDropdownOpen, setIsNamespaceDropdownOpen] = useState<boolean>(false);
+  const [searchInputValue, setSearchInputValue] = useState<string>('');
+  const [filteredNamespaces, setFilteredNamespaces] = useState<string[]>(namespaces);
+
+  useEffect(() => {
+    setFilteredNamespaces(namespaces);
+  }, [namespaces]);
+
+  const onToggleClick = () => {
+    if (!isNamespaceDropdownOpen) {
+      onClearSearch();
+    }
+    setIsNamespaceDropdownOpen(!isNamespaceDropdownOpen);
+  };
+
+  const onSearchInputChange = (value: string) => {
+    setSearchInputValue(value);
+  };
+
+  const onSearchButtonClick = () => {
+    const filtered =
+      searchInputValue === ''
+        ? namespaces
+        : namespaces.filter((ns) => ns.toLowerCase().includes(searchInputValue.toLowerCase()));
+    setFilteredNamespaces(filtered);
+  };
+
+  const onEnterPressed = (event: React.KeyboardEvent) => {
+    if (event.key === 'Enter') {
+      onSearchButtonClick();
+    }
+  };
+
+  const onSelect: DropdownProps['onSelect'] = (_event, value) => {
+    setSelectedNamespace(value as string);
+    setIsNamespaceDropdownOpen(false);
+  };
+
+  const onClearSearch = (event?: React.MouseEvent | React.ChangeEvent | React.FormEvent) => {
+    // Prevent the event from bubbling up and triggering dropdown close
+    event?.stopPropagation();
+    setSearchInputValue('');
+    setFilteredNamespaces(namespaces);
+  };
+
+  const dropdownItems = useMemo(
+    () =>
+      filteredNamespaces.map((ns) => (
+        <DropdownItem
+          key={ns}
+          itemId={ns}
+          className="namespace-list-items"
+          data-testid={`dropdown-item-${ns}`}
+        >
+          {ns}
+        </DropdownItem>
+      )),
+    [filteredNamespaces],
+  );
+
+  return (
+    <Dropdown
+      onSelect={onSelect}
+      toggle={(toggleRef) => (
+        <MenuToggle
+          ref={toggleRef}
+          onClick={onToggleClick}
+          isExpanded={isNamespaceDropdownOpen}
+          className="namespace-select-toggle"
+          data-testid="namespace-toggle"
+        >
+          {selectedNamespace}
+        </MenuToggle>
+      )}
+      isOpen={isNamespaceDropdownOpen}
+      onOpenChange={(isOpen) => setIsNamespaceDropdownOpen(isOpen)}
+      onOpenChangeKeys={['Escape']}
+      isScrollable
+      data-testid="namespace-dropdown"
+    >
+      <MenuSearch>
+        <MenuSearchInput>
+          <InputGroup>
+            <InputGroupItem isFill>
+              <SearchInput
+                value={searchInputValue}
+                placeholder="Search Namespace"
+                onChange={(_event, value) => onSearchInputChange(value)}
+                onKeyDown={onEnterPressed}
+                onClear={(event) => onClearSearch(event)}
+                aria-labelledby="namespace-search-button"
+                data-testid="namespace-search-input"
+              />
+            </InputGroupItem>
+            <InputGroupItem>
+              <Button
+                variant={ButtonVariant.control}
+                aria-label="Search namespace"
+                id="namespace-search-button"
+                onClick={onSearchButtonClick}
+                icon={<SearchIcon aria-hidden="true" />}
+                data-testid="namespace-search-button"
+              />
+            </InputGroupItem>
+          </InputGroup>
+        </MenuSearchInput>
+      </MenuSearch>
+      <Divider />
+      <DropdownList>{dropdownItems}</DropdownList>
+    </Dropdown>
+  );
+};
+
+export default NamespaceSelector;