feat: recently used segments (#9881)

frontend/src/component/feature/FeatureStrategy/FeatureStrategySegment/FeatureStrategySegment.tsx

@@ -11,6 +11,7 @@ import { useSegmentLimits } from 'hooks/api/getters/useSegmentLimits/useSegmentL
 import { Box, styled, Typography } from '@mui/material';
 import { HelpIcon } from 'component/common/HelpIcon/HelpIcon';
 import { useUiFlag } from 'hooks/useUiFlag';
+import { RecentlyUsedSegments } from './RecentlyUsedSegments/RecentlyUsedSegments';
 
 interface IFeatureStrategySegmentProps {
     segments: ISegment[];
@@ -105,6 +106,7 @@ export const FeatureStrategySegment = ({
                 segments={selectedSegments}
                 setSegments={setSelectedSegments}
             />
+            <RecentlyUsedSegments setSegments={setSelectedSegments} />
         </>
     );
 };

frontend/src/component/feature/FeatureStrategy/FeatureStrategySegment/RecentlyUsedSegments/RecentlyUsedSegments.tsx

@@ -0,0 +1,68 @@
+import { styled, Typography } from '@mui/material';
+import { useRecentlyUsedSegments } from './useRecentlyUsedSegments';
+import type { ISegment } from 'interfaces/segment';
+import { FeatureStrategySegmentChip } from '../FeatureStrategySegmentChip';
+import { useSegments } from 'hooks/api/getters/useSegments/useSegments';
+import { useUiFlag } from 'hooks/useUiFlag';
+
+type RecentlyUsedSegmentsProps = {
+    setSegments?: React.Dispatch<React.SetStateAction<ISegment[]>>;
+};
+
+const StyledContainer = styled('div')(({ theme }) => ({
+    marginTop: theme.spacing(3),
+}));
+
+const StyledHeader = styled(Typography)(({ theme }) => ({
+    fontSize: theme.fontSizes.smallerBody,
+    color: theme.palette.text.secondary,
+    marginBottom: theme.spacing(1),
+}));
+
+const StyledSegmentsContainer = styled('div')(({ theme }) => ({
+    display: 'flex',
+    flexWrap: 'wrap',
+    gap: theme.spacing(1),
+}));
+
+export const RecentlyUsedSegments = ({
+    setSegments,
+}: RecentlyUsedSegmentsProps) => {
+    const { items: recentlyUsedSegmentIds } = useRecentlyUsedSegments();
+    const { segments: allSegments } = useSegments();
+    const addEditStrategyEnabled = useUiFlag('addEditStrategy');
+
+    if (
+        !addEditStrategyEnabled ||
+        recentlyUsedSegmentIds.length === 0 ||
+        !setSegments ||
+        !allSegments
+    ) {
+        return null;
+    }
+
+    const segmentObjects = recentlyUsedSegmentIds
+        .map((id) => allSegments.find((segment) => segment.id === id))
+        .filter((segment) => segment !== undefined) as ISegment[];
+
+    if (segmentObjects.length === 0) {
+        return null;
+    }
+
+    return (
+        <StyledContainer>
+            <StyledHeader>Recently used segments</StyledHeader>
+            <StyledSegmentsContainer>
+                {segmentObjects.map((segment) => (
+                    <FeatureStrategySegmentChip
+                        key={segment.id}
+                        segment={segment}
+                        setSegments={setSegments}
+                        preview={undefined}
+                        setPreview={() => {}}
+                    />
+                ))}
+            </StyledSegmentsContainer>
+        </StyledContainer>
+    );
+};

frontend/src/component/feature/FeatureStrategy/FeatureStrategySegment/RecentlyUsedSegments/useRecentlyUsedSegments.test.tsx

@@ -0,0 +1,99 @@
+import { useRecentlyUsedSegments } from './useRecentlyUsedSegments';
+import { renderHook, act } from '@testing-library/react';
+
+describe('useRecentlyUsedSegments', () => {
+    beforeEach(() => {
+        window.localStorage.clear();
+    });
+
+    it('should initialize with empty array when no items in localStorage', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        expect(result.current.items).toEqual([]);
+    });
+
+    it('should initialize with initial items if provided', () => {
+        const initialItems = [1];
+        const { result } = renderHook(() =>
+            useRecentlyUsedSegments(initialItems),
+        );
+
+        expect(result.current.items).toEqual(initialItems);
+    });
+
+    it('should add new items to the beginning of the list', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        act(() => {
+            result.current.addItem(1);
+        });
+        expect(result.current.items[0]).toBe(1);
+
+        act(() => {
+            result.current.addItem(2);
+        });
+        expect(result.current.items[0]).toBe(2);
+        expect(result.current.items[1]).toBe(1);
+    });
+
+    it('should handle array of segment IDs', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        act(() => {
+            result.current.addItem([1, 2, 3]);
+        });
+
+        expect(result.current.items.length).toBe(3);
+        expect(result.current.items[0]).toBe(3);
+        expect(result.current.items[1]).toBe(2);
+        expect(result.current.items[2]).toBe(1);
+    });
+
+    it('should limit stored items to maximum of 3', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        act(() => {
+            result.current.addItem(1);
+            result.current.addItem(2);
+            result.current.addItem(3);
+            result.current.addItem(4);
+        });
+
+        expect(result.current.items.length).toBe(3);
+        expect(result.current.items[0]).toBe(4);
+        expect(result.current.items[1]).toBe(3);
+        expect(result.current.items[2]).toBe(2);
+    });
+
+    it('should not add duplicate segment IDs', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        act(() => {
+            result.current.addItem(1);
+            result.current.addItem(2);
+        });
+        expect(result.current.items.length).toBe(2);
+
+        act(() => {
+            result.current.addItem(1);
+        });
+
+        expect(result.current.items.length).toBe(2);
+        expect(result.current.items[0]).toBe(1);
+        expect(result.current.items[1]).toBe(2);
+    });
+
+    it('should persist items to localStorage', () => {
+        const { result } = renderHook(() => useRecentlyUsedSegments());
+
+        act(() => {
+            result.current.addItem(1);
+        });
+
+        const { result: newResult } = renderHook(() =>
+            useRecentlyUsedSegments(),
+        );
+
+        expect(newResult.current.items[0]).toBe(1);
+    });
+});

frontend/src/component/feature/FeatureStrategy/FeatureStrategySegment/RecentlyUsedSegments/useRecentlyUsedSegments.ts

@@ -0,0 +1,28 @@
+import { useLocalStorageState } from 'hooks/useLocalStorageState';
+
+export const useRecentlyUsedSegments = (initialItems: number[] = []) => {
+    const [items, setItems] = useLocalStorageState<number[]>(
+        'recently-used-segments',
+        initialItems,
+    );
+
+    const addItem = (newItem: number | number[]) => {
+        setItems((prevItems) => {
+            const itemsToAdd = Array.isArray(newItem) ? newItem : [newItem];
+
+            let updatedItems = [...prevItems];
+            itemsToAdd.forEach((id) => {
+                updatedItems = updatedItems.filter(
+                    (existingId) => existingId !== id,
+                );
+                updatedItems = [id, ...updatedItems];
+            });
+            return updatedItems.slice(0, 3);
+        });
+    };
+
+    return {
+        items,
+        addItem,
+    };
+};

frontend/src/hooks/api/actions/useFeatureStrategyApi/useFeatureStrategyApi.ts

@@ -5,6 +5,7 @@ import type {
 } from 'interfaces/strategy';
 import useAPI from '../useApi/useApi';
 import { useRecentlyUsedConstraints } from 'component/feature/FeatureStrategy/FeatureStrategyConstraints/RecentlyUsedConstraints/useRecentlyUsedConstraints';
+import { useRecentlyUsedSegments } from 'component/feature/FeatureStrategy/FeatureStrategySegment/RecentlyUsedSegments/useRecentlyUsedSegments';
 import { useUiFlag } from 'hooks/useUiFlag';
 
 const useFeatureStrategyApi = () => {
@@ -14,6 +15,7 @@ const useFeatureStrategyApi = () => {
 
     const { addItem: addToRecentlyUsedConstraints } =
         useRecentlyUsedConstraints();
+    const { addItem: addToRecentlyUsedSegments } = useRecentlyUsedSegments();
     const addEditStrategyEnabled = useUiFlag('addEditStrategy');
 
     const addStrategyToFeature = async (
@@ -30,14 +32,16 @@ const useFeatureStrategyApi = () => {
         );
         const result = await makeRequest(req.caller, req.id);
 
-        if (
-            addEditStrategyEnabled &&
-            payload.constraints &&
-            payload.constraints.length > 0
-        ) {
+        if (addEditStrategyEnabled) {
+            if (payload.constraints && payload.constraints.length > 0) {
                 addToRecentlyUsedConstraints(payload.constraints);
             }
 
+            if (payload.segments && payload.segments.length > 0) {
+                addToRecentlyUsedSegments(payload.segments);
+            }
+        }
+
         return result.json();
     };
 
@@ -71,13 +75,15 @@ const useFeatureStrategyApi = () => {
         );
         await makeRequest(req.caller, req.id);
 
-        if (
-            addEditStrategyEnabled &&
-            payload.constraints &&
-            payload.constraints.length > 0
-        ) {
+        if (addEditStrategyEnabled) {
+            if (payload.constraints && payload.constraints.length > 0) {
                 addToRecentlyUsedConstraints(payload.constraints);
             }
+
+            if (payload.segments && payload.segments.length > 0) {
+                addToRecentlyUsedSegments(payload.segments);
+            }
+        }
     };
 
     const setStrategiesSortOrder = async (