diff --git a/.planning/STATE.md b/.planning/STATE.md index 6ec3317..dc70878 100644 --- a/.planning/STATE.md +++ b/.planning/STATE.md @@ -9,19 +9,19 @@ See: .planning/PROJECT.md (updated 2026-02-09) ## Current Position -Phase: 3 of 4 (Overlay Refactor) -Plan: 2 of 2 complete -Status: Phase complete -Last activity: 2026-02-11 — Completed 03-02-PLAN.md +Phase: 4 of 4 (GPS Power Optimization) +Plan: 1 of 2 complete +Status: In progress +Last activity: 2026-02-12 — Completed 04-01-PLAN.md -Progress: [██████░░░░] 60% (Phase 3: 2/2 plans complete) +Progress: [███████░░░] 70% (Phase 4: 1/2 plans complete) ## Performance Metrics **Velocity:** -- Total plans completed: 6 -- Average duration: 6.3 minutes -- Total execution time: 0.63 hours +- Total plans completed: 7 +- Average duration: 6.0 minutes +- Total execution time: 0.71 hours **By Phase:** @@ -30,10 +30,11 @@ Progress: [██████░░░░] 60% (Phase 3: 2/2 plans complete) | 1. Foundation | 2 | 19.6 min | 9.8 min | | 2. Provider Migration | 2 | 11.5 min | 5.75 min | | 3. Overlay Refactor | 2 | 8.25 min | 4.1 min | +| 4. GPS Optimization | 1 | 4.9 min | 4.9 min | **Recent Trend:** -- Last 5 plans: 02-01 (7.7 min), 02-02 (3.8 min), 03-01 (4.0 min), 03-02 (4.25 min) -- Trend: Consistent sub-5-minute plans in Phase 3 +- Last 5 plans: 02-02 (3.8 min), 03-01 (4.0 min), 03-02 (4.25 min), 04-01 (4.9 min) +- Trend: Consistent sub-5-minute plans continuing in Phase 4 *Updated after each plan completion* @@ -70,8 +71,12 @@ Recent decisions affecting current work: | 03 | 02 | Error callback pattern for provider-to-screen comm | Implemented | | 03 | 02 | Staleness opacity via withValues(alpha:) no animation | Implemented | | 03 | 02 | GPS grace period timer created (Phase 4 lifecycle) | Implemented | -| 04 | TBD | Speed-adaptive GPS precision (~10 km/h threshold) | Pending | -| 04 | TBD | Background GPS only when overlay visible | Pending | +| 04 | 01 | Speed-adaptive GPS precision (8/12 km/h hysteresis) | Implemented | +| 04 | 01 | Precision switching gated until 5s after first fix | Implemented | +| 04 | 01 | Background grace period re-checks overlay at expiry | Implemented | +| 04 | 01 | Wake lock contextual: GPS + (overlay OR foreground) | Implemented | +| 04 | 01 | GPS stop preserves last data for staleness display | Implemented | +| 04 | 01 | BACKGROUND_GRACE_PERIOD (7s) replaces GPS_GRACE_PERIOD| Implemented | ### Pending Todos @@ -125,13 +130,20 @@ Recent decisions affecting current work: - INFO: Manual testing needed to verify overlay reliability improvements on physical device - INFO: All OVRL-01 through OVRL-06 requirements satisfied -**Phase 4 (GPS Optimization):** -- Speed thresholds (8/12 km/h) need field testing validation -- Android OEM behavior varies (Samsung, Xiaomi duty-cycling differences) +**Phase 4 (GPS Optimization) - In Progress:** +- RESOLVED: Core GPS engine complete with lifecycle awareness and precision switching +- RESOLVED: ProcessedGpsData timestamp field added for staleness detection +- RESOLVED: Background grace period (7s) with race condition protection +- RESOLVED: Conditional wake lock (GPS active + visible) +- INFO: Plan 04-01 complete (4.9 min) — ready for Plan 04-02 (UI Integration) +- PENDING: SpeedometerScreen needs gpsDataManager.setOverlayProvider() call +- PENDING: Background heartbeat (5s) may need adjustment vs 7s grace period +- FIELD TESTING: Speed thresholds (8/12 km/h) need validation on physical device +- FIELD TESTING: Android OEM behavior varies (Samsung, Xiaomi duty-cycling differences) ## Session Continuity -Last session: 2026-02-11 (Plan 03-02 execution complete) -Stopped at: Completed 03-02-PLAN.md — Phase 3 complete +Last session: 2026-02-12 (Plan 04-01 execution complete) +Stopped at: Completed 04-01-PLAN.md — Phase 4 in progress (1/2 plans) Resume file: None -Next action: Begin Phase 4 (GPS Optimization) planning +Next action: Execute Plan 04-02 (UI Integration) diff --git a/.planning/phases/04-gps-power-optimization/04-01-SUMMARY.md b/.planning/phases/04-gps-power-optimization/04-01-SUMMARY.md new file mode 100644 index 0000000..22fff22 --- /dev/null +++ b/.planning/phases/04-gps-power-optimization/04-01-SUMMARY.md @@ -0,0 +1,191 @@ +--- +phase: 04-gps-power-optimization +plan: 01 +subsystem: gps +tags: [geolocator, wakelock, lifecycle, precision-switching] + +requires: + - phase: 03-overlay-refactor + provides: OverlayProvider with isOverlayActive, OverlayService, staleness constants +provides: + - Lifecycle-aware GpsDataManager with WidgetsBindingObserver + - Speed-adaptive precision switching (8/12 km/h hysteresis) + - Background GPS management with 7s grace period + - Conditional wake lock (GPS active + visible) + - ProcessedGpsData with timestamp field + - Dynamic GPS stream via GpsService.createPositionStream() +affects: [04-02-ui-integration] + +tech-stack: + added: [wakelock_plus (already dependency)] + patterns: [WidgetsBindingObserver for lifecycle, hysteresis threshold switching, race condition protection] + +key-files: + created: [] + modified: + - lib/models/processed_gps_data.dart + - lib/config/gps_constants.dart + - lib/config/timing_constants.dart + - lib/gps_service.dart + - lib/services/gps_data_manager.dart + +key-decisions: + - "Speed-adaptive precision switching uses hysteresis (8/12 km/h) to prevent thrashing" + - "Precision switching gated until 5s after first GPS fix for stability" + - "Background grace period re-checks overlay state at expiry to handle race conditions" + - "Wake lock is contextual: enabled when GPS active AND (overlay visible OR app in foreground)" + - "GPS stop preserves last known data for staleness display (no data clearing)" + - "Deprecated GPS_GRACE_PERIOD (30s) in favor of BACKGROUND_GRACE_PERIOD (7s) for lifecycle" + +duration: 4.9min +completed: 2026-02-12 +--- + +# Phase 4 Plan 01: Core GPS Engine Summary + +**Lifecycle-aware GPS manager with speed-adaptive precision switching, 7s background grace period, and conditional wake lock control** + +## Performance + +- **Duration:** 4.9 minutes +- **Start:** 2026-02-11 23:57:48 UTC +- **End:** 2026-02-12 00:02:42 UTC +- **Tasks completed:** 2 +- **Files modified:** 5 +- **Commits:** 2 + +## Accomplishments + +Successfully transformed GpsDataManager into a fully lifecycle-aware GPS engine with intelligent power management: + +1. **ProcessedGpsData Timestamp Field** + - Added `timestamp` field to enable staleness detection in overlay + - Updated `copyWith()` to support timestamp parameter + - Changed default initialization from `const` to non-const with `DateTime.now()` + +2. **Precision Switching Constants** + - Added `PRECISION_UP_THRESHOLD_MPS` (3.33 m/s / 12 km/h) for high precision + - Added `PRECISION_DOWN_THRESHOLD_MPS` (2.22 m/s / 8 km/h) for balanced precision + - Added `PRECISION_SWITCH_FIRST_FIX_DELAY` (5s) safety gate + - Hysteresis prevents precision thrashing in 8-12 km/h range + +3. **Lifecycle Constants** + - Added `BACKGROUND_GRACE_PERIOD` (7s) for responsive background management + - Deprecated `GPS_GRACE_PERIOD` (30s) with clear documentation + +4. **Dynamic GPS Stream** + - Changed `GpsService.positionStream` from hardcoded `bestForNavigation` to `createPositionStream()` + - Accepts `LocationAccuracy` parameter for dynamic precision control + - Kept deprecated wrapper for backward compatibility during transition + +5. **Lifecycle-Aware GPS Manager** + - Implemented `WidgetsBindingObserver` mixin for app lifecycle tracking + - Added overlay provider reference for background decision-making + - Tracks foreground/background state, GPS active state, current accuracy + - Registers/removes lifecycle observer in initialize()/dispose() + +6. **Precision Switching Logic** + - Speed-based hysteresis switching (HIGH ↔ MEDIUM at 8/12 km/h boundaries) + - Gated until 5s after first GPS fix for stability + - Seamless stream recreation with new accuracy on switch + - Debug logging only (invisible to user per project decision) + +7. **Background GPS Management** + - 7s grace period when app backgrounds without overlay visible + - Immediate GPS continuation when app backgrounds with overlay active + - Grace period re-checks overlay state at expiry (race condition protection) + - GPS restart on app foreground resume if previously stopped + +8. **Conditional Wake Lock** + - Wake lock enabled when GPS active AND (overlay visible OR app in foreground) + - Wake lock disabled when GPS stops or app backgrounds without overlay + - Updated on all state transitions (GPS start/stop, lifecycle change) + - Disabled in dispose() as safety net + +9. **State Preservation** + - GPS stop does NOT clear `_currentData` (preserves last known speed/heading) + - Staleness detection shows last data as stale per existing timer logic + - Fresh data immediately replaces stale display on GPS restart + +## Task Commits + +| Task | Name | Commit | Files Modified | +| ---- | ----------------------------------------------------- | ------- | -------------- | +| 1 | Add timestamp and precision/lifecycle constants | c4d4032 | 4 files | +| 2 | Implement lifecycle-aware GPS engine with wake lock | 1618cfe | 1 file | + +## Files Created/Modified + +**Modified:** +- `lib/models/processed_gps_data.dart` — Added timestamp field and copyWith support +- `lib/config/gps_constants.dart` — Added precision switching thresholds (3.33/2.22 m/s, 5s delay) +- `lib/config/timing_constants.dart` — Added BACKGROUND_GRACE_PERIOD (7s), deprecated GPS_GRACE_PERIOD +- `lib/gps_service.dart` — Added createPositionStream() with dynamic accuracy, deprecated static getter +- `lib/services/gps_data_manager.dart` — Added lifecycle awareness, precision switching, wake lock control + +## Decisions Made + +1. **Hysteresis Thresholds:** 8/12 km/h boundaries prevent precision thrashing in transition zone +2. **First-Fix Gate:** 5s delay before precision switching prevents instability during initial acquisition +3. **Race Condition Protection:** Background grace period re-checks overlay state at expiry (not just at start) +4. **Wake Lock Strategy:** Conditional on GPS active + visible (overlay OR foreground) for minimal battery impact +5. **Data Preservation:** GPS stop preserves last known data, relying on existing staleness timer for UI feedback +6. **Grace Period Duration:** 7s chosen for responsive UX (short enough to save battery, long enough for quick returns) + +## Deviations from Plan + +### Auto-fixed Issues + +**1. [Rule 1 - Cleanup] Removed unnecessary flutter/foundation.dart import** +- **Found during:** Task 2 verification +- **Issue:** flutter analyze reported unnecessary import (flutter/widgets.dart provides ChangeNotifier) +- **Fix:** Removed `import 'package:flutter/foundation.dart';` from gps_data_manager.dart +- **Files modified:** lib/services/gps_data_manager.dart +- **Commit:** 1618cfe (included in Task 2 commit) + +## Issues Encountered + +None. Plan executed exactly as written with only one minor cleanup deviation (unnecessary import removal). + +## Next Phase Readiness + +**Ready for Plan 04-02 (UI Integration):** +- ✅ GpsDataManager implements full lifecycle awareness +- ✅ ProcessedGpsData carries timestamps for staleness detection +- ✅ Precision switching functional with hysteresis +- ✅ Background GPS management with grace period +- ✅ Wake lock contextual control implemented +- ✅ All timers properly canceled in dispose() +- ✅ Flutter analyze passes (only expected SCREAMING_SNAKE info warnings) + +**Integration points for Plan 04-02:** +- SpeedometerScreen needs to call `gpsDataManager.setOverlayProvider(overlayProvider)` after provider wiring +- No UI changes needed for precision switching (silent/invisible per user decision) +- Background heartbeat may need adjustment (currently 5s, may conflict with 7s grace period) +- Staleness detection in overlay should consume `ProcessedGpsData.timestamp` field + +**Testing considerations:** +- Field testing needed for 8/12 km/h hysteresis validation +- Android OEM behavior varies (Samsung, Xiaomi duty-cycling differences documented in research) +- Wake lock effectiveness depends on Android version and OEM power management + +## Self-Check: PASSED + +**Files exist:** +``` +FOUND: lib/models/processed_gps_data.dart +FOUND: lib/config/gps_constants.dart +FOUND: lib/config/timing_constants.dart +FOUND: lib/gps_service.dart +FOUND: lib/services/gps_data_manager.dart +``` + +**Commits exist:** +``` +FOUND: c4d4032 +FOUND: 1618cfe +``` + +**Flutter analyze status:** 30 issues (all expected SCREAMING_SNAKE info warnings, no errors) + +All claims verified. Plan execution complete.