docs(04-01): complete legacy JamTrack documentation plan
Tasks completed: 3/3 - Create JAMTRACK_LEGACY.md with 8-state machine and jQuery patterns - Create JAMTRACK_API.md with 15+ jamClient methods - Create JAMTRACK_REACT_PATTERNS.md with gap analysis SUMMARY: .planning/phases/04-jamtrack-research-design/04-01-SUMMARY.md
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@ -63,7 +63,7 @@ Plans:
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**Plans**: 2 plans
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Plans:
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- [ ] 04-01: Document legacy implementation, jamClient API, and React patterns
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- [x] 04-01: Document legacy implementation, jamClient API, and React patterns
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- [ ] 04-02: Design React architecture, Redux state, and Phase 5 roadmap
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### Phase 5: JamTrack Implementation
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@ -104,7 +104,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
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| 1. Backing Track Playback Monitoring | 1/1 | Complete | 2026-01-13 |
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| 2. Backing Track Seek Controls | 1/1 | Complete | 2026-01-14 |
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| 3. Backing Track Finalization | 3/3 | Complete | 2026-01-14 |
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| 4. JamTrack Research & Design | 0/2 | Planned | - |
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| 4. JamTrack Research & Design | 1/2 | In progress | - |
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| 5. JamTrack Implementation | 0/TBD | Not started | - |
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| 6. Metronome Research & Design | 0/TBD | Not started | - |
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| 7. Metronome Implementation | 0/TBD | Not started | - |
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@ -9,17 +9,17 @@ See: .planning/PROJECT.md (updated 2026-01-13)
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## Current Position
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Phase: 4 of 7 (JamTrack Research & Design) - PLANNED
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Plan: 0 of 2 in current phase
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Status: Phase 4 planning complete, ready for execution
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Last activity: 2026-01-14 — Planned Phase 4: 2 plans created
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Phase: 4 of 7 (JamTrack Research & Design) - IN PROGRESS
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Plan: 1 of 2 in current phase
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Status: In progress
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Last activity: 2026-01-14 — Completed 04-01-PLAN.md
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Progress: ████████░░ 43%
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Progress: █████████░ 50%
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## Performance Metrics
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**Velocity:**
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- Total plans completed: 5
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- Total plans completed: 6
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- Average duration: TBD
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- Total execution time: TBD
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@ -30,10 +30,11 @@ Progress: ████████░░ 43%
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| 1 | 1 | 3 min | 3 min |
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| 2 | 1 | 120 min | 120 min |
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| 3 | 3 | TBD | TBD |
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| 4 | 1 | 21 min | 21 min |
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**Recent Trend:**
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- Last 5 plans: 3 min, 120 min, TBD, TBD, TBD
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- Trend: Phase 3 complete with performance optimizations and UAT
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- Last 5 plans: 120 min, TBD, TBD, TBD, 21 min
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- Trend: Phase 4 documentation-focused (21 min), Phase 3 complete with UAT
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## Accumulated Context
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@ -68,6 +69,14 @@ Recent decisions affecting current work:
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- Loop handling: Check isLooping flag before stopping at track end
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- React optimizations: useCallback for handlers, conditional state updates
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**From Phase 4 Plan 1 (04-jamtrack-research-design):**
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- fqId format mandatory: All JamTrack jamClient calls require `{jamTrackId}-{sampleRate}` format
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- 8-state sync machine: no_client, initial, packaging, downloading, keying, synchronized, quiet, errored
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- JMEP must load before play: `JamTrackLoadJmep(fqId, jmepData)` before `JamTrackPlay(fqId)`
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- Mixdown selection: pickMyPackage() filters by ogg/jkz/sample_rate matching client capabilities
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- Callback pattern: jamClient download callbacks passed as string names, not function references
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- loadJamTrack thunk bug identified: Uses jamTrack.id instead of correct fqId format
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### Deferred Issues
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**From Phase 3 Plan 3 UAT:**
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@ -94,7 +103,7 @@ None yet.
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## Session Continuity
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Last session: 2026-01-14
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Stopped at: Completed Phase 4 planning with 2 plans created
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Stopped at: Completed Phase 4 Plan 1 (Document Legacy Implementation)
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Resume file: None
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**Next:** Phase 4 Plan 1 (Document Legacy Implementation) - Ready for execution
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**Next:** Phase 4 Plan 2 (Design React Architecture) - Ready for execution
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@ -0,0 +1,144 @@
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---
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phase: 04-jamtrack-research-design
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plan: 01
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subsystem: documentation
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tags: [jamtrack, legacy-analysis, react-patterns, api-documentation]
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# Dependency graph
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requires:
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- phase: 03-backing-track-finalization
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provides: Established React patterns (error handling, performance, jamClient integration)
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provides:
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- JAMTRACK_LEGACY.md - Legacy jQuery/CoffeeScript implementation patterns
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- JAMTRACK_API.md - Complete jamClient API reference for JamTrack methods
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- JAMTRACK_REACT_PATTERNS.md - React integration patterns and gap analysis
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affects: [05-jamtrack-implementation]
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# Tech tracking
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tech-stack:
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added: []
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patterns:
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- "Legacy pattern documentation (jQuery dialogs, CoffeeScript state machines, Reflux stores)"
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- "jamClient JamTrack API surface mapped (15+ methods)"
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- "React component architecture analyzed (existing + gaps)"
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- "Redux state structure documented (mediaSlice, activeSessionSlice, sessionUISlice)"
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key-files:
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created:
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- .planning/codebase/JAMTRACK_LEGACY.md
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- .planning/codebase/JAMTRACK_API.md
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- .planning/codebase/JAMTRACK_REACT_PATTERNS.md
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modified: []
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key-decisions:
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- "Documented 8-state sync machine (no_client, synchronized, packaging, downloading, keying, initial, quiet, errored)"
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- "Identified fqId format requirement: {jamTrackId}-{sampleRate} for all jamClient calls"
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- "Mapped existing JKSessionJamTrackModal (ready to use) vs missing JKSessionJamTrackPlayer (to be created)"
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- "Identified loadJamTrack thunk bug: uses jamTrack.id instead of fqId format"
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patterns-established:
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- "Documentation-driven design: comprehensive reference before implementation"
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- "Legacy-to-React migration pattern: document → design → implement"
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- "Gap analysis methodology: existing components vs required functionality"
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issues-created: []
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# Metrics
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duration: 21min
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completed: 2026-01-14
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---
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# Phase 4 Plan 1: Document Legacy JamTrack Implementation Summary
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**Comprehensive documentation of legacy JamTrack patterns, jamClient API, and React integration strategy for Phase 5 implementation**
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## Performance
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- **Duration:** 21 min
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- **Started:** 2026-01-14T15:47:24Z
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- **Completed:** 2026-01-14T16:08:29Z
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- **Tasks:** 3
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- **Files created:** 3
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## Accomplishments
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- **JAMTRACK_LEGACY.md** (264 lines): Captured 8-state download/sync machine, jQuery dialog patterns, Reflux stores, WebSocket subscriptions, REST API endpoints, and integration points
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- **JAMTRACK_API.md** (569 lines): Documented all 15+ JamTrack jamClient methods with signatures, parameters, return types, usage examples, and comparison to Backing Track APIs
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- **JAMTRACK_REACT_PATTERNS.md** (557 lines): Mapped existing React components, Redux state structure, hook patterns, data flow, and identified 20+ gaps for Phase 5
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create JAMTRACK_LEGACY.md** - `b7208d945` (docs)
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2. **Task 2: Create JAMTRACK_API.md** - `d3ff1f147` (docs)
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3. **Task 3: Create JAMTRACK_REACT_PATTERNS.md** - `d402b22fc` (docs)
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**Plan metadata:** (pending - this commit)
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## Files Created/Modified
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**Created:**
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- `.planning/codebase/JAMTRACK_LEGACY.md` - Legacy implementation reference (jQuery, CoffeeScript, Reflux)
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- `.planning/codebase/JAMTRACK_API.md` - jamClient JamTrack API documentation
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- `.planning/codebase/JAMTRACK_REACT_PATTERNS.md` - React patterns and Phase 5 gap analysis
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**Modified:** None
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## Decisions Made
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**Legacy Pattern Insights:**
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- **8-state synchronization machine**: Documented state transitions (no_client → initial → packaging → downloading → keying → synchronized)
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- **fqId format is mandatory**: All jamClient JamTrack calls require `{jamTrackId}-{sampleRate}` format, not just ID
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- **Mixdown selection logic**: pickMyPackage() filters by `file_type == 'ogg' && encrypt_type == 'jkz' && sample_rate == @sampleRate`
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- **JMEP must load before play**: `JamTrackLoadJmep(fqId, jmepData)` called before `JamTrackPlay(fqId)`
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- **Callback pattern**: jamClient download callbacks passed as string names, not function references
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**React Architecture Findings:**
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- **Existing ready-to-use**: JKSessionJamTrackModal, useMediaActions pattern, Redux infrastructure
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- **Missing components**: JKSessionJamTrackPlayer (main work), download/sync widget
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- **Redux state gaps**: jamTrackState needs expansion, download/sync tracking missing, loadJamTrack thunk uses wrong ID format
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- **Performance patterns**: Apply Phase 3 optimizations (visibility-aware polling, useCallback, lazy updates)
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**Critical implementation notes:**
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- jamClient returns Promises (always async/await)
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- jamClient returns strings for position/duration (always parseInt)
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- jamClient passed as prop, never stored in Redux (non-serializable)
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- Cleanup on unmount required (prevent stale state)
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None - all legacy files accessible, API methods documented, React patterns analyzed successfully.
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## Next Phase Readiness
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**Phase 4 Plan 2 ready to execute** with complete reference documentation:
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**Documentation completeness:**
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- ✓ All legacy patterns captured (dialog, state machine, stores, API endpoints, integration)
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- ✓ All jamClient methods documented (15+ methods with signatures and examples)
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- ✓ React architecture mapped (components, Redux, hooks, data flow)
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- ✓ Gap analysis complete (20+ specific items for Phase 5)
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- ✓ Code references accurate with line numbers
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**Phase 5 implementation path clear:**
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1. Fix loadJamTrack thunk fqId format bug
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2. Create JKSessionJamTrackPlayer component (similar to Backing Track)
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3. Implement download/sync state machine in React
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4. Expand Redux state for player and sync tracking
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5. Add WebSocket handlers (JAM_TRACK_CHANGES, MIXDOWN_CHANGES)
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6. Implement mixdown selection and CRUD operations
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**Lessons from documentation process:**
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- Legacy CoffeeScript state machine complexity well-documented for React translation
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- jamClient API surface larger than Backing Track (15+ vs 8 methods)
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- Existing React infrastructure strong foundation (modal, Redux, hooks)
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- Phase 3 Backing Track patterns directly applicable with extensions
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---
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*Phase: 04-jamtrack-research-design*
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*Completed: 2026-01-14*
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