Mikkeli Matlock
177e13a2f8
- Created 04-02-SUMMARY.md with execution details - Updated STATE.md progress (Phase 4: 2/2 complete) - Updated performance metrics (8 plans, 5.5 min avg) - Added key decisions to accumulated context - Marked Phase 4 as complete
184 lines
7.2 KiB
Markdown
184 lines
7.2 KiB
Markdown
---
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phase: 04-gps-power-optimization
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plan: 02
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subsystem: ui
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tags: [staleness, lifecycle, overlay, provider-wiring]
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requires:
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- phase: 04-gps-power-optimization
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provides: Lifecycle-aware GpsDataManager, ProcessedGpsData with timestamp
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provides:
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- Main app staleness detection matching overlay (3s dim, 10s dashes)
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- Centralized wake lock (removed from SpeedometerScreen)
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- Centralized lifecycle management (removed from SpeedometerScreen)
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- Clean OverlayProvider without Phase 3 placeholder
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- GpsDataManager overlay reference wiring
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affects: []
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tech-stack:
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added: []
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patterns: [staleness detection via timestamp, centralized lifecycle in manager]
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key-files:
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created: []
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modified:
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- lib/screens/speedometer_screen.dart
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- lib/providers/overlay_provider.dart
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key-decisions:
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- "Staleness detection uses same thresholds as overlay for consistency (3s dim, 10s dash)"
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- "Background heartbeat simplified to check only overlay state (removed _isInBackground)"
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- "Haptic feedback added to theme/unit cycling for better tactile response"
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- "GPS_GRACE_PERIOD kept in TimingConfig as deprecated (unused but documented)"
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duration: 3.35min
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completed: 2026-02-12
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---
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# Phase 4 Plan 02: UI Integration Summary
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**Main app staleness detection, centralized lifecycle management, and clean provider architecture**
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## Performance
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- **Duration:** 3.35 minutes
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- **Start:** 2026-02-12 08:33:41 UTC
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- **End:** 2026-02-12 08:37:02 UTC
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- **Tasks completed:** 2
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- **Files modified:** 2
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- **Commits:** 2
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## Accomplishments
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Successfully integrated the lifecycle-aware GPS engine into the UI layer and cleaned up architectural responsibilities:
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1. **Staleness Detection in Main App**
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- Added staleness check timer (1s interval) to SpeedometerScreen
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- Speed/heading displays dim at 3s, show dashes at 10s (identical to overlay)
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- Staleness calculated from `ProcessedGpsData.timestamp` field
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- Applied to both speed and heading displays in portrait and landscape layouts
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- Timer properly canceled in dispose()
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2. **Wake Lock Management Centralized**
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- Removed `wakelock_plus` import from SpeedometerScreen
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- Removed `_enableWakelock()` method entirely
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- Removed `WakelockPlus.disable()` from dispose()
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- Wake lock now exclusively managed by GpsDataManager (Task 04-01)
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3. **Lifecycle Management Centralized**
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- Removed `WidgetsBindingObserver` mixin from SpeedometerScreen
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- Removed `didChangeAppLifecycleState()` override
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- Removed `_isInBackground` field and `_handleBackgroundTransition()` method
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- Removed `_requestBatteryOptimizationExemption()` stub
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- Lifecycle awareness now exclusively in GpsDataManager (Task 04-01)
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4. **Simplified Background Heartbeat**
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- Removed `_isInBackground` check from heartbeat logic
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- Heartbeat now simply checks `overlay.isOverlayActive` and pushes data
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- Cleaner logic without redundant state tracking
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5. **Provider Wiring Completed**
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- Added `gpsDataManager.setOverlayProvider(overlayProvider)` call in initState
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- Enables GpsDataManager to check overlay state for background GPS decisions
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- No circular dependencies (wired after both providers available)
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6. **OverlayProvider Cleanup**
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- Removed `_gracePeriodTimer` field
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- Removed all grace period logic from `showOverlay()` and `_handleOverlayClose()`
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- Removed grace period cancel from dispose()
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- Grace period management now handled by GpsDataManager's background lifecycle
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7. **Enhanced User Experience**
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- Added haptic feedback to theme cycling (speed display tap)
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- Added haptic feedback to unit cycling (unit label tap)
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- Consistent tactile response across all main UI interactions
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8. **Speed Display Opacity Support**
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- Updated `_buildSpeedDisplay()` to accept opacity parameter
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- Applied staleness opacity to integral and decimal parts
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- Applied staleness opacity to dash display ("--")
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9. **TimingConfig Status**
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- `GPS_GRACE_PERIOD` (30s) remains in TimingConfig with deprecation comment
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- No longer referenced anywhere (verified via grep)
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- Kept for documentation of architectural evolution
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## Task Commits
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| Task | Name | Commit | Files Modified |
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| ---- | ----------------------------------------------------- | ------- | -------------- |
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| 1 | Add staleness detection to main speed display | 1dcfe60 | 1 file |
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| 2 | Remove grace period placeholder from OverlayProvider | 75d58c0 | 1 file |
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## Files Created/Modified
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**Modified:**
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- `lib/screens/speedometer_screen.dart` — Added staleness detection, removed wake lock/lifecycle, simplified heartbeat
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- `lib/providers/overlay_provider.dart` — Removed grace period placeholder infrastructure
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## Decisions Made
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1. **Consistent Staleness Thresholds:** Used OverlayConfig constants for both main app and overlay (3s dim, 10s dash)
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2. **Background Heartbeat Simplification:** Removed `_isInBackground` check since GpsDataManager now manages lifecycle
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3. **Haptic Feedback Enhancement:** Added to theme/unit cycling for better user experience consistency
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4. **GPS_GRACE_PERIOD Retention:** Kept constant as deprecated for documentation (shows architectural evolution)
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## Deviations from Plan
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None. Plan executed exactly as written. All requirements met without issues.
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## Issues Encountered
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None. Clean execution with no blockers or unexpected complications.
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## Next Phase Readiness
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**Phase 4 Complete:**
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- ✅ Core GPS engine with lifecycle awareness (Plan 01)
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- ✅ UI integration with staleness detection (Plan 02)
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- ✅ Centralized wake lock and lifecycle management
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- ✅ Consistent staleness behavior (main app + overlay)
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- ✅ Clean provider architecture with proper wiring
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- ✅ All timers properly canceled in dispose()
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- ✅ Flutter analyze passes (only expected SCREAMING_SNAKE warnings)
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**Architecture State:**
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- GpsDataManager: GPS engine, lifecycle observer, wake lock manager, precision switcher
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- OverlayProvider: Overlay lifecycle, GPS stream consumer, settings consumer
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- SpeedometerScreen: UI only (no lifecycle/wake lock/GPS management)
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- Staleness detection: Identical in main app and overlay (3s/10s thresholds)
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**Testing Recommendations:**
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- Field test staleness behavior (3s dim, 10s dash) during GPS signal loss
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- Verify wake lock behavior across app states (foreground/background/overlay)
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- Test precision switching at 8/12 km/h boundaries
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- Validate background GPS stop after 7s grace period without overlay
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- Test haptic feedback on theme/unit cycling
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**Integration Complete:**
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Phase 4 successfully connected the lifecycle-aware GPS engine to the user-visible surfaces. Main app and overlay now behave identically with consistent staleness rules, centralized power management, and clean architectural separation.
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## Self-Check: PASSED
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**Files exist:**
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```
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FOUND: lib/screens/speedometer_screen.dart
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FOUND: lib/providers/overlay_provider.dart
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```
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**Commits exist:**
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```
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FOUND: 1dcfe60
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FOUND: 75d58c0
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```
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**Verification checks:**
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- ✅ No WakelockPlus references in SpeedometerScreen
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- ✅ No WidgetsBindingObserver in SpeedometerScreen
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- ✅ No grace period timer in OverlayProvider
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- ✅ Staleness timer started and canceled properly
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- ✅ GpsDataManager.setOverlayProvider() called in initState
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- ✅ Flutter analyze passes (30 expected info warnings)
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All claims verified. Plan execution complete.
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