docs(02-01): complete backing track seek controls with UAT
Phase 2 complete with comprehensive UAT testing and critical fixes. Summary updates: - Documented 4 UAT issues discovered during testing - 3 blocker issues resolved (UAT-001, UAT-002, UAT-004) - 1 minor issue deferred to Phase 3 (UAT-003) - 13 total commits (3 feat + 5 fix + 4 docs + 1 refactor) - Duration: 120 min (2 min execution + 118 min UAT/fixes) Key discoveries: - jamClient in jam-ui uses Proxy pattern (all methods return Promises) - jamClient returns string values (must parseInt) - jamClient cannot be stored in Redux (immutability violation) - End-of-track requires SessionStopPlay() reset before new playback State updates: - Added decisions from Phase 2 to accumulated context - Added UAT-003 to deferred issues - Updated velocity metrics (120 min total for Phase 2) - Ready for Phase 3 (Backing Track Finalization) Roadmap updates: - Phase 2 completion date: 2026-01-14
This commit is contained in:
Nuwan
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@ -99,7 +99,7 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
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| Phase | Plans Complete | Status | Completed |
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|-------|----------------|--------|-----------|
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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 | 2026-01-13 |
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| 2. Backing Track Seek Controls | 1/1 | Complete | 2026-01-14 |
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| 3. Backing Track Finalization | 0/TBD | Not started | - |
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| 4. JamTrack Research & Design | 0/TBD | Not started | - |
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| 5. JamTrack Implementation | 0/TBD | Not started | - |
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@ -11,8 +11,8 @@ See: .planning/PROJECT.md (updated 2026-01-13)
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Phase: 2 of 7 (Backing Track Seek Controls)
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Plan: 1 of 1 in current phase
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Status: Phase complete
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Last activity: 2026-01-13 — Completed 02-01-PLAN.md
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Status: Phase complete (with UAT)
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Last activity: 2026-01-14 — Completed Phase 2 with UAT testing and fixes
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Progress: ████░░░░░░ 29%
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@ -20,19 +20,19 @@ Progress: ████░░░░░░ 29%
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**Velocity:**
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- Total plans completed: 2
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- Average duration: 2.5 min
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- Total execution time: 0.08 hours
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- Average duration: 61.5 min
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- Total execution time: 2.05 hours
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**By Phase:**
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| Phase | Plans | Total | Avg/Plan |
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|-------|-------|-------|----------|
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| 1 | 1 | 3 min | 3 min |
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| 2 | 1 | 2 min | 2 min |
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| 2 | 1 | 120 min | 120 min |
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**Recent Trend:**
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- Last 5 plans: 3 min, 2 min
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- Trend: Improving (faster execution)
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- Last 5 plans: 3 min, 120 min
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- Trend: Phase 2 included extensive UAT testing and critical bug fixes
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## Accumulated Context
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@ -41,11 +41,20 @@ Progress: ████░░░░░░ 29%
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Decisions are logged in PROJECT.md Key Decisions table.
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Recent decisions affecting current work:
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(None yet)
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**From Phase 2 (02-backing-track-seek-controls):**
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- jamClient must NOT be stored in Redux state - pass as prop instead (non-serializable)
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- All jamClient methods in jam-ui return Promises - always use async/await pattern
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- jamClient returns string values - always parseInt() before math operations
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- End-of-track position requires SessionStopPlay() reset before new playback
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- Defer UAT-003 (seek while paused limitation) to Phase 3 - minor impact
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### Deferred Issues
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None yet.
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**UAT-003: Seek while paused doesn't register** (from Phase 2)
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- Severity: Minor
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- Impact: Seeking during playback works perfectly, paused seeking requires workaround
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- Deferred to: Phase 3 (Backing Track Finalization)
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- Details: .planning/phases/02-backing-track-seek-controls/02-01-ISSUES.md
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### Blockers/Concerns
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@ -53,6 +62,8 @@ None yet.
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## Session Continuity
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Last session: 2026-01-13T18:10:40Z
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Stopped at: Completed 02-01-PLAN.md (Phase 2 complete)
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Last session: 2026-01-14
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Stopped at: Completed Phase 2 with UAT testing (3 blocker issues resolved, 1 minor issue deferred)
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Resume file: None
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**Next:** Phase 3 (Backing Track Finalization) - Plan the phase or proceed with execution
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@ -2,7 +2,7 @@
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phase: 02-backing-track-seek-controls
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plan: 01
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subsystem: ui
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tags: [react, hooks, jamClient, native-integration, seek-controls]
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tags: [react, hooks, jamClient, native-integration, seek-controls, uat, async-await]
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# Dependency graph
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requires:
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@ -12,97 +12,334 @@ provides:
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- Functional seek slider with drag-to-position capability
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- currentPositionMs and durationMs state for slider calculations
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- handleSeek implementation using jamClient.SessionTrackSeekMs()
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- Edge case handling for end-of-track seeking
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- jamClient async/await pattern established
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affects: [03-backing-track-finalization, media-player-ui]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [optimistic UI updates, millisecond state for slider precision, SessionTrackSeekMs() integration]
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patterns: [optimistic UI updates, millisecond state for slider precision, SessionTrackSeekMs() integration, jamClientProxy async/await pattern, end-of-track reset]
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key-files:
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created: []
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modified: [jam-ui/src/components/client/JKSessionBackingTrackPlayer.js]
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created: [.planning/phases/02-backing-track-seek-controls/02-01-ISSUES.md]
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modified: [jam-ui/src/components/client/JKSessionBackingTrackPlayer.js, jam-ui/src/components/client/JKSessionScreen.js]
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key-decisions:
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- "Separate state for milliseconds (slider calculations) vs formatted strings (display)"
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- "Optimistic UI update before jamClient call for responsive UX"
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- "Polling useEffect auto-corrects position drift within 500ms"
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- "Works identically during playback and when paused (no special handling needed)"
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- "jamClient must NOT be stored in Redux state - pass as prop instead"
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- "All jamClient methods in jam-ui return Promises - always use async/await"
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- "jamClient returns string values - always parseInt() before math operations"
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- "End-of-track position requires SessionStopPlay() reset before new playback"
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- "Defer UAT-003 (seek while paused) to Phase 3 - minor impact, likely jamClient limitation"
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patterns-established:
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- "Slider state pattern: numeric state (currentPositionMs/durationMs) for calculations, formatted state (currentTime/duration) for display"
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- "Optimistic update pattern: Update local state immediately, let polling correct any drift"
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- "Native client seek integration: jamClient.SessionTrackSeekMs(positionMs) with error handling"
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- "jamClient integration pattern in jam-ui: Always async/await, always parseInt string returns, never store in Redux"
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- "End-of-track detection: position >= duration - 50ms, reset via SessionStopPlay() before SessionStartPlay()"
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issues-created: []
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issues-created: [.planning/phases/02-backing-track-seek-controls/02-01-ISSUES.md (UAT-003)]
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# Metrics
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duration: 2min
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completed: 2026-01-13
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duration: 120min
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completed: 2026-01-14
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uat-issues-found: 4
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uat-issues-resolved: 3
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uat-issues-deferred: 1
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---
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# Phase 2 Plan 1: Backing Track Seek Controls Summary
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**Functional seek slider with drag-to-position capability using jamClient.SessionTrackSeekMs() and optimistic UI updates**
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**Completed:** 2026-01-14
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**Duration:** ~120 min (including UAT and critical fixes)
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**Plan:** 02-backing-track-seek-controls/02-01-PLAN.md
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## Objective
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Make the backing track seek bar functional by wiring it to real playback position and implementing drag-to-position capability using jamClient.SessionTrackSeekMs().
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## Performance
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- **Duration:** 2 min
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- **Duration:** ~120 min (2 min plan execution + 118 min UAT and fixes)
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- **Started:** 2026-01-13T18:08:39Z
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- **Completed:** 2026-01-13T18:10:40Z
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- **Tasks:** 3
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- **Files modified:** 1
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- **Completed:** 2026-01-14
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- **Tasks:** 3 planned + 4 UAT fixes
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- **Files modified:** 2
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- **Commits:** 13 total (3 feat + 5 fix + 4 docs + 1 refactor)
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## Accomplishments
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- Added currentPositionMs and durationMs state for numeric slider calculations
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- Wired slider to reflect live playback position via polling updates from Phase 1
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- Implemented handleSeek with jamClient.SessionTrackSeekMs() integration and optimistic updates
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- Slider now functional during both playback and pause states
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### Core Functionality (Tasks 1-3) ✅
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- ✅ Added `currentPositionMs` and `durationMs` state for numeric slider calculations
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- ✅ Wired slider to reflect live playback position via polling updates
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- ✅ Implemented `handleSeek()` with jamClient.SessionTrackSeekMs() integration
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- ✅ Slider functional during playback
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### UAT Discoveries and Fixes ✅
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During user acceptance testing, discovered and resolved **4 critical issues** that were blocking core functionality:
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**UAT-001: Redux Immutability Violation** *(Blocker - RESOLVED)*
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- **Issue:** Player wouldn't open - jamClient object stored in Redux state caused mutation detection error
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- **Root cause:** Storing non-serializable jamClient object in Redux state at `activeSession.backingTrackData.jamClient.app`
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- **Fix:** Removed jamClient from Redux state, pass as direct prop from JKSessionScreen component scope
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- **Impact:** Established pattern for all future jamClient usage - never store in Redux
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- **Commit:** `94d43fe9c`
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**UAT-002: NaN Values and No Audio** *(Blocker - RESOLVED)*
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- **Issue:** Time displays showed "NaN:NaN", slider jumped to middle, no audio playback
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- **Root causes:**
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1. jamClient methods return Promises but code called them synchronously without `await`
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2. jamClient returns string values ('0', '228818') not numbers
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3. SessionStartPlay() missing required playback mode parameter (1)
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- **Critical discovery:** jam-ui uses jamClientProxy with Proxy pattern where ALL methods return Promises (different from legacy web's synchronous bridge.invokeMethod())
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- **Fix:** Added async/await for all jamClient calls, parseInt() for string conversion, SessionStartPlay(1) parameter
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- **Impact:** Established async/await pattern for all jamClient usage in jam-ui
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- **Commits:** `0561c8988`, `2a435806e`, `2c5ba2f4b`
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**UAT-003: Seek While Paused Limitation** *(Minor - OPEN/DEFERRED)*
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- **Issue:** Seeking while paused doesn't take effect until next play cycle
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- **Impact:** Seek during playback works perfectly, seeking while paused requires workaround
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- **Severity:** Minor - most users seek while playing, workaround exists (start play first)
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- **Analysis:** Appears to be jamClient limitation where SessionTrackSeekMs() only registers during active playback
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- **Status:** Documented in ISSUES.md, deferred to Phase 3 for investigation
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**UAT-004: Seek to End While Paused Breaks Player** *(Blocker - RESOLVED)*
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- **Issue:** Seeking to end while paused, then clicking play caused player to break (no audio, slider resets, play button stops working)
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- **Root cause:** jamClient enters end-of-track state when position >= duration, calling SessionStartPlay() without reset causes undefined behavior
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- **Fix:** Detect end position (within 50ms of duration), call SessionStopPlay() to reset jamClient state, seek to 0, then start playback normally
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- **Impact:** Better UX - player resets to beginning when trying to play from end position
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- **Commits:** `ba93f1a27`, `fc2b26355`, `0db622ad6`
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**Enhancement: Logging Improvements**
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- **Added:** `[BTP]` prefix to all console logs for easier filtering during debugging
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- **Benefit:** Significantly improved debugging efficiency during UAT
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- **Commit:** `3fb235240`
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## Task Commits
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Each task was committed atomically:
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### Plan Execution
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1. **Task 1: Add state for position in milliseconds** - `209cefcf2` (feat)
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2. **Task 2: Wire slider to reflect current position** - `491c0a68e` (feat)
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3. **Task 3: Implement functional handleSeek** - `18afc9370` (feat)
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### UAT Fixes
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4. **UAT-001: Redux immutability fix** - `94d43fe9c` (fix)
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5. **UAT-002: NaN defensive checks** - `0561c8988` (fix)
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6. **UAT-002: Async/await implementation** - `2a435806e` (fix)
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7. **UAT-002: String parsing and parameters** - `2c5ba2f4b` (fix)
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8. **UAT-004: End-of-track edge case** - `ba93f1a27` (fix)
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### Documentation & Refinement
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9. **UAT-004 documentation** - `0db622ad6` (docs)
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10. **UAT-004 resolution confirmation** - `fc2b26355` (docs)
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11. **Logging prefix enhancement** - `3fb235240` (refactor)
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12. **Initial plan completion** - `6e69c8974` (docs)
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13. **Plan creation** - `2e312849a` (docs)
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## Files Created/Modified
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- `jam-ui/src/components/client/JKSessionBackingTrackPlayer.js` - Added currentPositionMs/durationMs state, wired slider inputs, implemented handleSeek function
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**Created:**
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- `.planning/phases/02-backing-track-seek-controls/02-01-ISSUES.md` - UAT issue tracking document
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**Modified:**
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- `jam-ui/src/components/client/JKSessionBackingTrackPlayer.js` - Added position state, wired slider, implemented seek, fixed async issues, added edge case handling, added diagnostic logging
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- `jam-ui/src/components/client/JKSessionScreen.js` - Removed jamClient from Redux dispatch, pass as direct prop instead
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## Key Technical Discoveries
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### 1. jamClient Architecture in jam-ui
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**Critical finding:** jam-ui uses jamClientProxy with Proxy pattern where ALL methods return Promises
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- Different from legacy web's synchronous `bridge.invokeMethod()` calls
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- Implementation in `jamClientProxy.js`: `sendMessage()` returns `deferred.promise`
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- `setupAsyncProxy()` wraps all method calls to return `sendWhenReady()` Promise
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- **Implication:** Always use async/await when calling jamClient methods in jam-ui components
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### 2. jamClient Return Values
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- All methods return string values ('0', '228818') not numbers
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- Must use `parseInt(value, 10) || 0` before math operations or comparisons
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- Example: `SessionCurrrentPlayPosMs()` returns `'1502'` (string) not `1502` (number)
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### 3. Redux State Serialization
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- Cannot store non-serializable objects (like jamClient) in Redux state
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- Redux Toolkit's immutability checks catch this in development mode
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- Error message: "A state mutation was detected between dispatches, in the path 'activeSession.backingTrackData.jamClient.app'"
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- **Solution:** Pass jamClient as prop through component tree, never store in Redux
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### 4. End-of-Track State Handling
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- jamClient enters special state when `position >= duration`
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- Must call `SessionStopPlay()` to reset before starting new playback
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- Detection threshold: within 50ms of duration to avoid false positives during normal seeking
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- Without reset: Player enters broken state (no audio, UI becomes non-functional)
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### 5. SessionStartPlay Parameter
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- Requires playback mode parameter: `SessionStartPlay(1)` for normal playback
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- Without parameter: Audio doesn't play (silent failure)
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- Legacy web code consistently uses `SessionStartPlay(1)` or `SessionStartPlay(data.playbackMode)`
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## Decisions Made
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- **Separate state for calculations vs display:** Used currentPositionMs/durationMs (numbers) for slider min/max/value calculations, kept currentTime/duration (strings) for M:SS display format. This separation maintains clean concerns.
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- **Optimistic UI updates:** Update local state immediately on slider drag before calling jamClient for responsive feel. Phase 1 polling useEffect auto-corrects actual position within 500ms.
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- **No special pause handling:** Seeking works identically during playback and pause. No need for conditional logic or polling suspension.
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- **Error handling strategy:** Log seek errors to console but don't crash. Polling will recover position on next cycle.
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1. **Separate state for milliseconds vs formatted strings**
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- Slider uses numeric values (`currentPositionMs`, `durationMs`)
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- Display uses M:SS format (`currentTime`, `duration`)
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- Rationale: Clean separation of concerns, easier calculations
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2. **Optimistic UI updates**
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- Update local state immediately before jamClient call
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- Provides responsive UX feel
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- 500ms polling auto-corrects any drift
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3. **End-of-track reset to beginning**
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- When playing from end position, reset to 0:00 and start playback
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- Better UX than broken state or silent failure
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- Matches common media player behavior
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4. **jamClient as prop, not Redux**
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- Pass directly as prop instead of storing in Redux
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- Follows React best practices for non-serializable data
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- Prevents Redux immutability violations
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5. **Always async/await for jamClient in jam-ui**
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- Established pattern for all jam-ui components
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- Different from legacy web synchronous pattern
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- Prevents Promise object issues
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6. **Always parseInt jamClient returns**
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- Established pattern for all numeric operations
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- Prevents NaN issues in calculations and comparisons
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- Defensive `|| 0` fallback for safety
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7. **Defer UAT-003 to Phase 3**
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- Accept seeking while paused limitation
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- Minor impact (seek during playback works perfectly)
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- Most users seek while playing
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- Likely requires jamClient changes (deeper investigation needed)
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## Deviations from Plan
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None - plan executed exactly as written.
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**Plan:** "Works identically during playback and when paused (no special handling needed)"
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**Reality:** Seeking while paused has limitations (UAT-003). Added special handling for end-of-track edge case (UAT-004).
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**Reason:** Plan didn't account for jamClient async architecture and state management behavior.
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## Issues Encountered
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None - straightforward implementation building on Phase 1 foundation.
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1. **Redux immutability violation** - jamClient in Redux state
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2. **Async/await missing** - jamClient Proxy pattern not understood
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3. **String vs number types** - jamClient return values needed parsing
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4. **Missing API parameter** - SessionStartPlay(1) required
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5. **End-of-track state** - jamClient requires reset before replay
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**All resolved except UAT-003 (deferred)**
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## Edge Cases Tested
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✅ **Pass:** Seek while playing - audio jumps to position
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✅ **Pass:** Seek to start - restarts from 0:00
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✅ **Pass:** Seek to end - resets to beginning and plays
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✅ **Pass:** Play → Stop → Seek → Play - works correctly
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✅ **Pass:** Seek past end boundary - slider stays at max
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⚠️ **Limitation:** Rapid seeks while paused - doesn't register (UAT-003)
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⚠️ **Limitation:** Seek during initial load - doesn't register (UAT-003)
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## Verification Results
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**Core Functionality:**
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- ✅ Slider starts at far left (0:00)
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- ✅ Slider moves smoothly during playback
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- ✅ Slider position matches time display
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- ✅ Drag slider during playback - audio jumps to position
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- ✅ Time display updates to match slider
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- ✅ Seek to end resets to beginning (edge case handling)
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- ✅ Seek to start works correctly
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- ✅ Console clean (no errors during normal operation)
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**Edge Cases:**
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- ✅ Seek to end while paused - works (resets to beginning)
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- ⚠️ Seek while paused - limitation documented (UAT-003)
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- ✅ Multiple seeks while playing - works
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- ✅ Play after stop - works
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- ✅ Seek past end boundary - handled gracefully
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## Known Limitations
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**UAT-003: Seeking while paused doesn't register with jamClient**
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- **Severity:** Minor
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- **Workaround:** Start playback, then seek
|
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- **Impact:** Seek during playback works perfectly, most users seek while playing
|
||||
- **Status:** Documented, deferred to Phase 3
|
||||
- **Likely cause:** jamClient limitation (SessionTrackSeekMs() only active during playback)
|
||||
|
||||
## Next Phase Readiness
|
||||
|
||||
Phase 3 (Backing Track Finalization) can now proceed. The player has complete core functionality (play/pause/stop, time display, seek). Phase 3 will add:
|
||||
- Comprehensive error handling (jamClient failures, file not found, invalid formats)
|
||||
- Edge cases (seek beyond duration, rapid seeks, seek during stop transition)
|
||||
- Performance optimization (reduce polling frequency when not visible, cleanup on unmount)
|
||||
- UI polish (loading states, disabled states during transitions)
|
||||
✅ **Phase 3 (Backing Track Finalization) ready to proceed**
|
||||
|
||||
All verification criteria met:
|
||||
- Slider starts at far left (0:00) when track loads
|
||||
- Slider moves smoothly during playback
|
||||
- Slider position matches time display percentage
|
||||
- Dragging slider seeks to position (audio changes)
|
||||
- Time display updates to match slider position
|
||||
- Seeking works when paused
|
||||
- Seeking to end/beginning works correctly
|
||||
- No console errors
|
||||
- Both modal and popup versions functional
|
||||
Phase 2 delivered fully functional seek controls with robust edge case handling. The player now has complete core functionality:
|
||||
- ✅ Play/Pause/Stop controls
|
||||
- ✅ Real-time position monitoring (500ms polling)
|
||||
- ✅ Time display (current/duration in M:SS format)
|
||||
- ✅ Functional seek slider with drag-to-position
|
||||
- ✅ Edge case handling (end-of-track reset)
|
||||
- ✅ jamClient async/await patterns established
|
||||
- ✅ Redux state rules enforced
|
||||
|
||||
**Deferred to Phase 3:**
|
||||
- Investigate and fix UAT-003 (seek while paused) or document as known limitation
|
||||
- Comprehensive error handling (jamClient failures, file errors, network issues)
|
||||
- Performance optimization (polling frequency tuning, cleanup on unmount)
|
||||
- UI polish (loading states, smooth transitions, disabled states)
|
||||
- Loop functionality testing
|
||||
- Volume control testing
|
||||
|
||||
## Patterns Established for Future Work
|
||||
|
||||
### jamClient Integration Pattern (jam-ui)
|
||||
```javascript
|
||||
// ✅ CORRECT - jam-ui pattern
|
||||
const handleAction = async () => {
|
||||
const value = await jamClient.SomeMethod();
|
||||
const numericValue = parseInt(value, 10) || 0;
|
||||
// ... use numericValue
|
||||
};
|
||||
|
||||
// ❌ WRONG - Don't use synchronous calls
|
||||
const value = jamClient.SomeMethod(); // Returns Promise, not value!
|
||||
|
||||
// ❌ WRONG - Don't store in Redux
|
||||
dispatch(setState({ jamClient: jamClient })); // Immutability violation!
|
||||
```
|
||||
|
||||
### End-of-Track Detection Pattern
|
||||
```javascript
|
||||
// Detect end position (within 50ms threshold)
|
||||
if (currentPositionMs >= durationMs - 50 && durationMs > 0) {
|
||||
await jamClient.SessionStopPlay(); // Reset state
|
||||
await jamClient.SessionTrackSeekMs(0); // Seek to start
|
||||
// Now safe to start playback
|
||||
await jamClient.SessionStartPlay(1);
|
||||
}
|
||||
```
|
||||
|
||||
## Lessons Learned
|
||||
|
||||
1. **UAT is critical** - Discovered 4 major issues that unit tests wouldn't catch
|
||||
2. **jamClient architecture differs from legacy** - Always use async/await in jam-ui components
|
||||
3. **Redux immutability rules are strict** - Never store non-serializable objects in Redux state
|
||||
4. **Edge cases matter** - End-of-track position requires special handling to prevent broken states
|
||||
5. **Logging prefixes save time** - `[BTP]` prefix made debugging significantly faster
|
||||
6. **Type safety matters** - jamClient string returns caused NaN issues until parseInt() added
|
||||
7. **Plan assumptions may be wrong** - "Works identically when paused" assumption proven false by UAT
|
||||
8. **API parameters matter** - SessionStartPlay(1) required, silent failure without it
|
||||
|
||||
---
|
||||
|
||||
*Phase: 02-backing-track-seek-controls*
|
||||
*Completed: 2026-01-13*
|
||||
*Plan: 01*
|
||||
*Duration: ~120 min*
|
||||
*Status: Complete*
|
||||
*UAT Issues: 4 found, 3 resolved, 1 deferred*
|
||||
|
|
|
|||
Loading…
Reference in New Issue