docs(07-03): complete websocket integration and selectors plan

Summary:
- Added CHAT_MESSAGE WebSocket handler with message transformation
- Implemented 8 memoized selectors using Reselect
- Created localStorage utilities with error handling
- 90 total tests passing (14 WebSocket, 68 Redux/selectors, 8 localStorage)
- 9 commits following strict TDD RED-GREEN-REFACTOR methodology

Metadata Updates:
- Created 07-03-SUMMARY.md with decisions and test coverage details
- Updated STATE.md: Phase 7 complete (3/3 plans), progress 50%
- Updated ROADMAP.md: Phase 7 marked complete, ready for Phase 8

Phase 7 Status: Complete
Next: Phase 8 (Chat Window UI & Message Display)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
This commit is contained in:
Nuwan 2026-01-27 12:47:30 +05:30
parent 8b312dafb7
commit 9be85da11a
3 changed files with 119 additions and 9 deletions

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@ -39,7 +39,7 @@ Decimal phases appear between their surrounding integers in numeric order.
**Milestone Goal:** Add real-time chat functionality to music sessions with modeless window, message history, read/unread tracking, and file attachment display.
- [x] **Phase 6: Session Chat Research & Design** - Explore legacy chat implementation, design React patterns
- [ ] **Phase 7: Chat Infrastructure & State Management** - Redux state, WebSocket handlers, API integration
- [x] **Phase 7: Chat Infrastructure & State Management** - Redux state, WebSocket handlers, API integration
- [ ] **Phase 8: Chat Window UI & Message Display** - Modeless dialog, message list with user info
- [ ] **Phase 9: Message Composition & Sending** - Text input, send functionality, real-time delivery
- [ ] **Phase 10: Read/Unread Status Management** - Unread tracking, indicator badge, mark-as-read logic
@ -131,7 +131,7 @@ Plans:
Plans:
- [x] 07-01: Redux Slice & Core Reducers (TDD) - sessionChatSlice with 7 reducers, message deduplication, unread tracking
- [x] 07-02: Async Thunks & API Integration (TDD) - REST methods, fetchChatHistory, sendMessage with optimistic updates
- [ ] 07-03: WebSocket Integration & Selectors (TDD) - CHAT_MESSAGE handler, 8 memoized selectors, localStorage persistence
- [x] 07-03: WebSocket Integration & Selectors (TDD) - CHAT_MESSAGE handler, 8 memoized selectors, localStorage persistence
#### Phase 8: Chat Window UI & Message Display
**Goal**: Build modeless chat dialog with message list and user information display
@ -182,7 +182,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7 → 8 →
| 4. JamTrack Research & Design | v1.0 | 2/2 | Complete | 2026-01-14 |
| 5. JamTrack Implementation | v1.0 | 5/5 | Complete | 2026-01-14 |
| 6. Session Chat Research & Design | v1.1 | 2/2 | Complete | 2026-01-26 |
| 7. Chat Infrastructure & State Management | v1.1 | 2/3 | In progress | 2026-01-27 |
| 7. Chat Infrastructure & State Management | v1.1 | 3/3 | Complete | 2026-01-27 |
| 8. Chat Window UI & Message Display | v1.1 | 0/TBD | Not started | - |
| 9. Message Composition & Sending | v1.1 | 0/TBD | Not started | - |
| 10. Read/Unread Status Management | v1.1 | 0/TBD | Not started | - |

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@ -10,11 +10,11 @@ See: .planning/PROJECT.md (updated 2026-01-13)
## Current Position
Phase: 7 of 11 (Chat Infrastructure & State Management)
Plan: 07-02 Complete
Status: Phase 7 in progress (2/3 plans complete), ready for Plan 07-03 (WebSocket Integration)
Last activity: 2026-01-27 — Plan 2 (Async Thunks & API Integration) complete
Plan: 07-03 Complete
Status: Phase 7 complete (3/3 plans), ready for Phase 8 (Chat Window UI & Message Display)
Last activity: 2026-01-27 — Plan 3 (WebSocket Integration & Selectors) complete
Progress: ████░░░░░░ 40% (v1.1)
Progress: █████░░░░░ 50% (v1.1)
## Performance Metrics
@ -35,9 +35,9 @@ Progress: ████░░░░░░ 40% (v1.1)
| 5 | 5 | 54 min | 10.8 min |
**v1.1 Music Session Chat (In Progress):**
- Total plans completed: 4 (Phase 6: 2 plans, Phase 7: 2 plans)
- Total plans completed: 5 (Phase 6: 2 plans, Phase 7: 3 plans)
- Total phases: 6 (phases 6-11)
- Progress: 40% (Phase 6 complete, Phase 7 in progress - 2/3 plans)
- Progress: 50% (Phase 6 complete, Phase 7 complete, Phase 8 ready to start)
**Recent Trend:**
- Last milestone: v1.0 completed 2026-01-14 with excellent velocity
@ -203,6 +203,21 @@ Recent decisions affecting current work:
- Test coverage: 100% for all async operations and state transitions
- Commit history: 7 commits following TDD RED-GREEN-REFACTOR phases
**From Phase 7 Plan 3 (07-chat-infrastructure):**
- CHAT_MESSAGE WebSocket handler: transforms Protocol Buffer format (msg_id, user_id, etc.) to Redux format
- Channel key construction: session uses session_id directly, lesson uses lesson_session_id, global uses 'global' literal
- Unread increment logic: increment if window closed OR viewing different channel, do NOT increment if window open and viewing same channel
- getChannelKeyFromMessage() helper function extracted for reusability across WebSocket and Redux
- useSelector in WebSocket hook to access real-time chat state for unread logic
- 8 memoized selectors using Reselect: selectChatMessages, selectUnreadCount, selectTotalUnreadCount, selectIsChatWindowOpen, selectActiveChannel, selectFetchStatus, selectSendStatus, selectSendError
- localStorage utilities: saveLastReadAt, loadLastReadAt, clearLastReadAt with graceful error handling
- localStorage integration: load on Redux initialization, save on openChatWindow and markAsRead actions
- Storage key: 'jk_chat_lastReadAt' with JSON format: { "channel-id": "ISO-timestamp", ... }
- Error handling strategy: catch without throwing, console.error for debugging, return empty object on parse errors
- 90 total tests passing: 14 WebSocket, 68 Redux/selectors, 8 localStorage
- Test coverage: 100% for all WebSocket routing, selector memoization, and localStorage operations
- Commit history: 9 commits following strict TDD RED-GREEN-REFACTOR phases (3 commits per task)
### Deferred Issues
**From Phase 3 Plan 3 UAT:**

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@ -0,0 +1,95 @@
---
phase: 07-chat-infrastructure
plan: 03
status: complete
type: tdd
started: 2026-01-27
completed: 2026-01-27
---
# Phase 7 Plan 3: WebSocket Integration & Selectors Summary
**Implemented WebSocket message handling and memoized selectors using TDD methodology**
## Accomplishments
- Added CHAT_MESSAGE handler to useSessionWebSocket.js with message transformation and unread increment logic
- Implemented 8 memoized selectors using Reselect (createSelector from Redux Toolkit)
- Created localStorage utilities (saveLastReadAt, loadLastReadAt, clearLastReadAt) for lastReadAt persistence
- Comprehensive unit test suite with 90 tests (14 WebSocket, 68 Redux/selectors, 8 localStorage)
- WebSocket message routing validated (Protocol Buffer → Redux format transformation)
- Selector memoization performance confirmed (same reference for unchanged state)
- localStorage error handling validated (quota exceeded, JSON parse errors)
## Files Created/Modified
### Created Files
- `jam-ui/src/hooks/__tests__/useSessionWebSocket.test.js` - WebSocket handler tests (14 tests)
- `jam-ui/src/helpers/chatStorage.js` - localStorage utilities for lastReadAt persistence
- `jam-ui/src/helpers/__tests__/chatStorage.test.js` - localStorage utility tests (8 tests)
### Modified Files
- `jam-ui/src/hooks/useSessionWebSocket.js` - Added CHAT_MESSAGE handler with message transformation and unread logic
- `jam-ui/src/store/features/sessionChatSlice.js` - Added 8 memoized selectors and localStorage integration
- `jam-ui/src/store/features/__tests__/sessionChatSlice.test.js` - Added 15 selector tests (total 68 tests)
## Decisions Made
**Channel Key Construction:**
- Session messages: Use `session_id` directly as channel key
- Lesson messages: Use `lesson_session_id` directly as channel key
- Global messages: Use literal string `'global'` as channel key
- Extracted `getChannelKeyFromMessage()` helper function for consistency across WebSocket and Redux
**Unread Increment Logic:**
- Increment unread count if chat window is closed (regardless of active channel)
- Increment unread count if window is open but viewing a different channel
- Do NOT increment if window is open and viewing the same channel
- Uses `useSelector` in WebSocket hook to access real-time chat state
**localStorage Error Strategy:**
- All functions catch errors without throwing (graceful degradation)
- Quota exceeded errors: Data not saved, but app continues normally
- JSON parse errors: Return empty object `{}` to allow app initialization
- Console.error for debugging, but no user-facing errors
**Selector Memoization:**
- Used `createSelector` from Redux Toolkit (includes Reselect)
- Input selectors are private (direct state access)
- Output selectors are exported for component use
- Selectors with parameters use second argument pattern: `(state, param) => param`
## Issues Encountered
None. TDD methodology helped catch issues early:
- Tests for message transformation caught snake_case → camelCase conversion needs
- Tests for unread logic clarified window state requirements
- Tests for localStorage validated error handling before integration
## Test Coverage
**Total Tests: 90** (all passing)
- WebSocket handler: 14 tests (message transformation, channel keys, unread logic, integration)
- Redux selectors: 15 tests (8 selectors with edge cases and memoization validation)
- Redux reducers/thunks: 53 tests (from previous plans, still passing)
- localStorage utilities: 8 tests (save, load, clear with error handling)
**TDD Phases Executed:**
- Task 1: RED (tests fail) → GREEN (implementation) → REFACTOR (JSDoc) - 3 commits
- Task 2: RED (tests fail) → GREEN (implementation) → REFACTOR (JSDoc) - 3 commits
- Task 3: RED (tests fail) → GREEN (implementation) → REFACTOR (docs) - 3 commits
## Next Phase Readiness
**Phase 7 complete!** Redux infrastructure (state, reducers, thunks, selectors, WebSocket integration, localStorage persistence) fully implemented and tested.
**Ready for Phase 8 (Chat Window UI & Message Display).**
Phase 8 will build the UI components:
- JKSessionChatButton with unread badge
- JKSessionChatWindow with WindowPortal
- Message list with auto-scroll
- Message display components
- Text input composer
Use `/gsd:plan-phase 8` to break down Phase 8 into executable plans.