docs(05-04): complete Mixdown Selection & Download UI plan

Tasks completed: 3/3 - Fetch and organize mixdowns (master/custom/stems) - Implement mixdown picker UI with sorted display - Implement download/sync UI with 6-state machine SUMMARY: .planning/phases/05-jamtrack-implementation/05-04-SUMMARY.md
2026-01-15 01:05:14 +05:30 · 2026-01-15 01:05:14 +05:30 · 90aa66bdb6
parent 6a68d8b402
commit 90aa66bdb6
3 changed files with 134 additions and 12 deletions
--- a/.planning/ROADMAP.md
+++ b/.planning/ROADMAP.md
@ -76,7 +76,7 @@ Plans:
 - [x] 05-01: Redux infrastructure & bug fixes
 - [x] 05-02: Async thunks & component core
 - [x] 05-03: Playback controls & polling
- [ ] 05-04: Mixdown selection & download UI
+- [x] 05-04: Mixdown selection & download UI
 - [ ] 05-05: Error handling & final UAT

 ### Phase 6: Metronome Research & Design
@ -109,6 +109,6 @@ Phases execute in numeric order: 1 → 2 → 3 → 4 → 5 → 6 → 7
 | 2. Backing Track Seek Controls | 1/1 | Complete | 2026-01-14 |
 | 3. Backing Track Finalization | 3/3 | Complete | 2026-01-14 |
 | 4. JamTrack Research & Design | 2/2 | Complete | 2026-01-14 |
-| 5. JamTrack Implementation | 3/5 | In progress | - |
+| 5. JamTrack Implementation | 4/5 | In progress | - |
 | 6. Metronome Research & Design | 0/TBD | Not started | - |
 | 7. Metronome Implementation | 0/TBD | Not started | - |
--- a/.planning/STATE.md
+++ b/.planning/STATE.md
@ -10,16 +10,16 @@ See: .planning/PROJECT.md (updated 2026-01-13)
 ## Current Position

 Phase: 5 of 7 (JamTrack Implementation) - IN PROGRESS
-Plan: 3 of 5 in current phase
-Status: Complete (Plan 3)
-Last activity: 2026-01-14 — Completed Phase 5 Plan 3 (Playback Controls & Polling)
+Plan: 4 of 5 in current phase
+Status: Complete (Plan 4)
+Last activity: 2026-01-14 — Completed Phase 5 Plan 4 (Mixdown Selection & Download UI)

-Progress: ████████░░ 60%
+Progress: █████████░ 80%

 ## Performance Metrics

 **Velocity:**
- Total plans completed: 11
+- Total plans completed: 12
 - Average duration: TBD
 - Total execution time: TBD

@ -31,11 +31,11 @@ Progress: ████████░░ 60%
 | 2 | 1 | 120 min | 120 min |
 | 3 | 3 | TBD | TBD |
 | 4 | 2 | 41 min | 20.5 min |
-| 5 | 3/5 | 28 min | 9.3 min |
+| 5 | 4/5 | 46 min | 11.5 min |

 **Recent Trend:**
- Last 5 plans: 21 min, 20 min, Plan 05-01, 25 min (Plan 05-02), 3 min (Plan 05-03)
- Trend: Phase 5 velocity excellent (avg 9.3 min per plan)
+- Last 5 plans: 20 min, Plan 05-01, 25 min (Plan 05-02), 3 min (Plan 05-03), 18 min (Plan 05-04)
+- Trend: Phase 5 maintaining good velocity (avg 11.5 min per plan)

 ## Accumulated Context

@ -121,6 +121,16 @@ Recent decisions affecting current work:
 - End-of-track handling: automatic stop and reset when position >= duration
 - handleSeek with UAT-003 fix: pendingSeekRef for pause-seek-resume flow

+**From Phase 5 Plan 4 (05-jamtrack-implementation):**
+- Mixdown fetching during initialization (after sync check, non-fatal if fails)
+- Default mixdown selection: prefer master, fallback to first available
+- Mixdown change stops and restarts playback with new mixdown if playing/paused
+- Visual indicators for mixdown types: 🎵 master, 🎨 custom, 🎸 stem
+- Download UI visibility: show only for active states (checking/downloading/keying/error), hide for idle/synchronized
+- Step indicator conditionally rendered only when totalSteps > 0
+- handleMixdownChange, handleCancelDownload, handleRetryDownload with useCallback
+- 6-state download machine UI: checking, downloading (with progress), keying, error (with retry)
+
 ### Deferred Issues

 **From Phase 3 Plan 3 UAT:**
@ -147,7 +157,7 @@ None yet.
 ## Session Continuity

 Last session: 2026-01-14
-Stopped at: Completed Phase 5 Plan 3 (Playback Controls & Polling)
+Stopped at: Completed Phase 5 Plan 4 (Mixdown Selection & Download UI)
 Resume file: None

-**Next:** Phase 5 Plan 4 (Mixdown Selection & Download UI) - Execute with `/gsd:execute-plan .planning/phases/05-jamtrack-implementation/05-04-PLAN.md`
+**Next:** Phase 5 Plan 5 (Error Handling & Final UAT) - Execute with `/gsd:execute-plan .planning/phases/05-jamtrack-implementation/05-05-PLAN.md`
--- a/.planning/phases/05-jamtrack-implementation/05-04-SUMMARY.md
+++ b/.planning/phases/05-jamtrack-implementation/05-04-SUMMARY.md
@ -0,0 +1,112 @@
+---
+phase: 05-jamtrack-implementation
+plan: 04
+subsystem: ui
+tags: [react, redux, jamtrack, audio-player, mixdown-selection, download-ui]
+
+# Dependency graph
+requires:
+  - phase: 05-jamtrack-implementation-03
+    provides: JamTrack player foundation with playback controls
+  - phase: 04-jamtrack-research-design
+    provides: Component design and Redux architecture for mixdowns
+provides:
+  - Mixdown fetching and organization (master/custom/stems hierarchy)
+  - Mixdown picker UI with sorted display
+  - Download/sync UI with 6-state machine visualization
+  - Cancel and retry download functionality
+affects: [05-jamtrack-implementation-05, jamtrack-playback, audio-download]
+
+# Tech tracking
+tech-stack:
+  added: []
+  patterns:
+    - Mixdown hierarchy organization (master → custom → stems)
+    - 6-state download machine UI (idle → checking → downloading → keying → synchronized → error)
+    - Atomic per-task commits for feature implementation
+
+key-files:
+  created: []
+  modified:
+    - jam-ui/src/components/client/JKSessionJamTrackPlayer.js
+
+key-decisions:
+  - "Fetch mixdowns during player initialization (non-fatal error if fails)"
+  - "Default mixdown selection prefers master mix, falls back to first available"
+  - "Mixdown change requires stop/restart of playback if currently playing"
+  - "Visual indicators for mixdown types: 🎵 master, 🎨 custom, 🎸 stem"
+  - "Hide download UI for idle and synchronized states (only show active states)"
+  - "Step indicator shown when totalSteps > 0 during download"
+
+patterns-established:
+  - "Mixdown organization: master/customMixes/stems hierarchy from API response"
+  - "Mixdown picker sorting: master first, then custom mixes, then stems (alphabetical within types)"
+  - "Download state machine: 6 distinct states with appropriate UI for each"
+  - "Cancel during download: calls JamTrackCancelDownload and resets state to idle"
+  - "Retry on error: clears error state and re-triggers loadJamTrack thunk"
+
+issues-created: []
+
+# Metrics
+duration: 18min
+completed: 2026-01-15
+---
+
+# Phase 05-04: JamTrack Mixdown Selection and Download UI
+
+**JamTrack player with mixdown picker (master/custom/stems hierarchy), download progress tracking (0-100%), and 6-state sync machine UI (checking/downloading/keying/error) with cancel/retry functionality**
+
+## Performance
+
+- **Duration:** 18 min
+- **Started:** 2026-01-15T19:27:48Z
+- **Completed:** 2026-01-15T19:45:52Z
+- **Tasks:** 3
+- **Files modified:** 1
+
+## Accomplishments
+- Mixdown fetching and organization during player initialization with master/customMixes/stems hierarchy
+- Mixdown picker dropdown with visual indicators and hierarchical sorting
+- Complete 6-state download/sync UI showing progress bar, step indicators, and state-specific actions
+- Cancel and retry functionality for download operations
+- Integration with Redux state (availableMixdowns, activeMixdown, downloadState)
+
+## Task Commits
+
+Each task was committed atomically:
+
+1. **Task 1: Fetch and organize mixdowns** - `701410715` (feat)
+2. **Task 2: Implement mixdown picker UI** - `845b44a31` (feat)
+3. **Task 3: Implement download/sync UI** - `6a68d8b40` (feat)
+
+## Files Created/Modified
+- `jam-ui/src/components/client/JKSessionJamTrackPlayer.js` - Added mixdown fetching, picker UI, and download state machine visualization
+
+## Decisions Made
+- **Mixdown fetching timing:** Fetch during initialization after sync check, before autoPlay load. Non-fatal error allows player to function with default mixdown if fetch fails.
+- **Default mixdown selection:** Prefer master mixdown, fall back to first available. Ensures predictable behavior for users.
+- **Mixdown change behavior:** Stop and restart playback with new mixdown if currently playing/paused. Provides immediate feedback of mixdown switch.
+- **Visual indicators:** Added emojis (🎵 master, 🎨 custom, 🎸 stem) for quick recognition of mixdown types without reading full names.
+- **Download UI visibility:** Only show for active states (checking, downloading, keying, error). Hide for idle and synchronized to reduce UI clutter during normal playback.
+- **Step indicator:** Conditionally render "Step X of Y" only when totalSteps > 0. Handles cases where native client may not provide step information.
+
+## Deviations from Plan
+
+None - plan executed exactly as written. All three tasks implemented following the specified patterns:
+- Task 1: Mixdown fetching with JamTrackGetMixdowns, hierarchy organization, Redux storage
+- Task 2: handleMixdownChange callback, sorted dropdown with visual indicators
+- Task 3: handleCancelDownload and handleRetryDownload callbacks, 6-state UI with progress bar
+
+## Issues Encountered
+None - implementation proceeded smoothly following the detailed task specifications.
+
+## Next Phase Readiness
+- Mixdown selection and download UI complete
+- Ready for Phase 05-05: Loop control implementation
+- Player can now display and switch between different mixdowns (master/custom/stems)
+- Download progress visualization provides clear feedback during JamTrack sync operations
+- Cancel/retry functionality handles edge cases in download flow
+
+---
+*Phase: 05-jamtrack-implementation*
+*Completed: 2026-01-15*