docs(07-01): complete redux slice and core reducers plan
Phase 7 Plan 1 Summary: - Created sessionChatSlice with 7 reducers using strict TDD methodology - All 40 tests passing with 100% reducer coverage - Message deduplication validated for WebSocket + REST scenario - Multi-channel unread tracking working correctly - 3 integration tests validate complete message flows Commits: - fd44d1255: Initial state tests (RED) - e98504eba: Initial state implementation (GREEN) - 60a559e58: Core reducer tests (RED) - 15a658a5d: Core reducer implementation (GREEN) - 96d7188a4: Unread tracking tests (RED) - 7bafb3c69: Unread tracking implementation (GREEN) Ready for Phase 7 Plan 2 (Async Thunks & API Integration). Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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---
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phase: 07-chat-infrastructure
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plan: 01
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type: tdd
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status: completed
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completedAt: 2026-01-27
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---
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# Phase 7 Plan 1: Redux Slice & Core Reducers Summary
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**Created sessionChatSlice with all reducers using TDD methodology**
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## Accomplishments
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- Created sessionChatSlice.js with complete initial state structure matching CHAT_REDUX_DESIGN.md
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- Implemented 7 reducers using strict TDD approach (RED-GREEN-REFACTOR):
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- `addMessageFromWebSocket`: Message handling with deduplication and unread logic
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- `setActiveChannel`: Channel selection for viewing
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- `openChatWindow`: Opens window and resets unread count
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- `closeChatWindow`: Closes window without affecting unread counts
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- `markAsRead`: Explicitly marks channel as read with timestamp
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- `incrementUnreadCount`: Manual unread count increment
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- `setWindowPosition`: UI position persistence
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- Comprehensive unit test suite with 40 tests and 100% reducer coverage
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- Message deduplication logic validated (critical for WebSocket + REST scenario)
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- Unread tracking system tested and working across multi-channel scenarios
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- 3 integration tests validate complete message flows and multi-channel behavior
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- Registered sessionChat slice in Redux store configuration
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## Files Created/Modified
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### Created Files
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- `jam-ui/src/store/features/sessionChatSlice.js` - Redux slice with 7 reducers and helper function
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- `jam-ui/src/store/features/__tests__/sessionChatSlice.test.js` - Comprehensive unit and integration tests (40 tests)
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### Modified Files
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- `jam-ui/src/store/store.js` - Added sessionChat reducer to store configuration
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## Test Coverage
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**40 total tests passing:**
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- 13 tests for initial state structure
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- 8 tests for addMessageFromWebSocket (including deduplication)
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- 2 tests for setActiveChannel
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- 3 tests for openChatWindow
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- 2 tests for closeChatWindow
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- 3 tests for markAsRead
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- 3 tests for incrementUnreadCount
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- 3 tests for setWindowPosition
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- 3 integration tests for complete flows
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## Decisions Made
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### Channel Key Construction
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Implemented `getChannelKey()` helper function to construct channel keys:
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- Session messages: Use `sessionId` directly (not prefixed with 'session-')
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- Lesson messages: Use `lessonSessionId` directly
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- Global messages: Use 'global' string
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This matches the design doc specification where channel keys are used directly as IDs rather than prefixed strings.
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### Message Deduplication Strategy
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Used `Array.some()` to check for existing message by `id` before insertion. This is efficient for typical chat message counts and prevents duplicate messages when the same message arrives via both WebSocket and REST API.
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### Unread Count Logic
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Unread count increments when:
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- Window is closed (regardless of active channel)
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- Window is open BUT viewing a different channel
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This ensures users see unread counts for background channels while preventing increments for the currently visible channel.
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### Timestamp Handling
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All timestamps use `new Date().toISOString()` for consistency with server-side timestamps. This ensures proper sorting and display across time zones.
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## Issues Encountered
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None. TDD approach caught all issues early:
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- Initial tests validated state structure
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- Core reducer tests validated message handling and deduplication
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- Integration tests validated multi-reducer interactions
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- All tests passed on first GREEN phase implementation
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## Commit History
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Task 1 commits:
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- `fd44d1255` - test(07-01): add failing tests for sessionChatSlice initial state
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- `e98504eba` - feat(07-01): implement sessionChatSlice with initial state structure
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Task 2 commits:
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- `60a559e58` - test(07-01): add failing tests for core reducers with message deduplication
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- `15a658a5d` - feat(07-01): implement core reducers with message deduplication logic
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Task 3 commits:
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- `96d7188a4` - test(07-01): add failing tests for unread tracking and integration flows
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- `7bafb3c69` - feat(07-01): implement unread tracking reducers and complete slice
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## Next Phase Readiness
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**Ready for Plan 07-02 (Async Thunks & API Integration):**
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- State structure complete and tested
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- All reducers implemented and validated
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- Integration tests prove multi-reducer coordination works
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- Message deduplication strategy validated
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- Unread tracking foundation ready for WebSocket integration
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**Phase 7 Plan 2 will implement:**
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- `fetchChatHistory` async thunk for REST API
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- `sendChatMessage` async thunk for sending messages
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- WebSocket message handler integration
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- Loading/error state management via extraReducers
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