---
phase: 03-overlay-refactor
verified: 2026-02-11T10:29:03Z
status: passed
score: 9/9 must-haves verified
re_verification: false
---

# Phase 3: Overlay Refactor Verification Report

**Phase Goal:** Fix overlay data staleness and communication reliability issues
**Verified:** 2026-02-11T10:29:03Z
**Status:** PASSED
**Re-verification:** No - initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Overlay receives continuous GPS updates without going stale | VERIFIED | OverlayProvider subscribes to GpsDataManager.dataStream and forwards every GPS tick via _pushDataToOverlay (lines 55-59) |
| 2 | Overlay displays dashes when data is more than 10 seconds old (3s dim threshold) | VERIFIED | Staleness timer checks every 1s shows dashes after STALENESS_DASH_THRESHOLD (10s) dims at STALENESS_DIM_THRESHOLD (3s) using opacity |
| 3 | Overlay creation failures surface to user via snackbar | VERIFIED | OverlayProvider calls onError callback on permission denial (line 82) and creation failure (line 112) SpeedometerScreen shows SnackBar (lines 91-97) |
| 4 | OverlayService encapsulates all flutter_overlay_window platform calls | VERIFIED | All platform calls isolated in OverlayService OverlayProvider has zero direct FlutterOverlayWindow usage |
| 5 | Heartbeat timer only runs when overlay active AND app backgrounded | VERIFIED | Timer checks both _isInBackground AND overlay.isOverlayActive (speedometer_screen.dart line 126) |
| 6 | Overlay shows current speed and heading that matches main app display | VERIFIED | OverlayProvider pushes OverlayMessage.updateDisplay with speedText heading unitIndex themeIndex on every GPS tick and settings change |
| 7 | Permission errors show snackbar with Settings action button | VERIFIED | _handleOverlayError creates SnackBarAction for OverlayError.permission that calls openAppSettings() (lines 78-81) |
| 8 | Recovery from staleness is immediate snap-back (no animation) | VERIFIED | Staleness opacity applied directly via color.withValues(alpha:) no AnimatedOpacity used (overlay_screen.dart lines 173 188 216 229) |
| 9 | GPS grace period timer (30s) created on overlay close | VERIFIED | _gracePeriodTimer starts on _handleOverlayClose (line 251) cancelled on showOverlay (line 74) |

**Score:** 9/9 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| lib/services/overlay_service.dart | Platform channel wrapper with retry logic | VERIFIED | 97 lines methods: showOverlay closeOverlay shareData isActive overlayListener checkPermission. RetryOptions with 3 attempts and 200ms delay |
| lib/models/overlay_message.dart | Timestamp field with serialization | VERIFIED | timestamp field (line 13) auto-populated in factories (lines 49 57 65) serialized as millisecondsSinceEpoch (line 80) deserialized with fallback (lines 96-98) |
| lib/config/overlay_constants.dart | Staleness thresholds (3s dim 10s dash) | VERIFIED | STALENESS_DIM_THRESHOLD = 3s (line 39) STALENESS_DASH_THRESHOLD = 10s (line 42) STALENESS_DIM_OPACITY = 0.5 (line 45) STALENESS_CHECK_INTERVAL = 1s (line 48) |
| lib/config/timing_constants.dart | GPS_GRACE_PERIOD constant | VERIFIED | GPS_GRACE_PERIOD = 30s (line 18) |
| lib/providers/overlay_provider.dart | OverlayService integration with error callback | VERIFIED | OverlayService dependency (line 16) onError callback field (line 34) permission checks (line 79) verified creation (lines 105-114) grace period timer (lines 74 250-254) |
| lib/screens/overlay_screen.dart | Staleness detection timer and UI | VERIFIED | _stalenessCheckTimer (line 27) _lastUpdateTime tracking (line 83) staleness monitoring (lines 105-116) opacity calculation (lines 125-127) opacity applied to all display elements |
| lib/screens/speedometer_screen.dart | Error snackbar surfacing | VERIFIED | onError callback registration (line 35) _handleOverlayError method (lines 69-98) SnackBar with Settings action for permission errors |
| lib/main.dart | OverlayService in provider tree | VERIFIED | OverlayService registered (line 20) injected into OverlayProvider constructor (line 28) |
| pubspec.yaml | retry package dependency | VERIFIED | retry 3.1.2 present |

### Key Link Verification

| From | To | Via | Status | Details |
|------|-----|-----|--------|---------|
| OverlayProvider | OverlayService | Constructor injection all platform calls delegated | WIRED | _overlayService field (line 16) used in showOverlay (lines 79 94 105) closeOverlay (line 133) shareData (line 167) overlayListener (line 180) isActive (line 221) |
| OverlayProvider | SpeedometerScreen | onError callback for snackbar surfacing | WIRED | onError field set by SpeedometerScreen (speedometer_screen.dart line 35) called on permission/creation errors (overlay_provider.dart lines 82 112) |
| OverlayScreen | OverlayMessage.timestamp | Reads timestamp for staleness calculation | WIRED | _lastUpdateTime = message.timestamp (line 83) age calculated in staleness check (line 109) and build (line 125) |
| OverlayScreen | OverlayConfig constants | Uses staleness thresholds for visual feedback | WIRED | STALENESS_CHECK_INTERVAL (line 106) STALENESS_DASH_THRESHOLD (line 110) STALENESS_DIM_THRESHOLD (line 126) STALENESS_DIM_OPACITY (line 127) |
| main.dart | OverlayService | Provider registration and injection | WIRED | Provider OverlayService created (line 20) passed to OverlayProvider constructor (line 28) |
| OverlayService | flutter_overlay_window | Platform channel delegation with retry | WIRED | showOverlay (lines 24 38) closeOverlay (line 57) shareData (line 71) isActive (line 81) overlayListener (line 90) |
| OverlayService | retry package | RetryOptions for showOverlay closeOverlay | WIRED | RetryOptions configured (lines 10-12) used in showOverlay (line 22) and closeOverlay (line 55) |
| GpsDataManager | OverlayProvider | Stream subscription for continuous updates | WIRED | _gpsSubscription listens to dataStream (line 55) calls _pushDataToOverlay on each tick (line 57) |

### Requirements Coverage

| Requirement | Status | Blocking Issue |
|-------------|--------|----------------|
| OVRL-01: Continuous debounced data updates | SATISFIED | GPS stream forwarded on every tick via _gpsSubscription.listen to _pushDataToOverlay |
| OVRL-02: Overlay errors surfaced to user | SATISFIED | onError callback mechanism connects OverlayProvider to SpeedometerScreen for snackbar display |
| OVRL-03: Overlay creation verified | SATISFIED | showOverlay checks return value from OverlayService (which calls isActive after platform showOverlay) |
| OVRL-04: Messages include timestamp | SATISFIED | OverlayMessage.timestamp field auto-populated and serialized as millisecondsSinceEpoch |
| OVRL-05: Overlay displays dashes when stale | SATISFIED | Staleness timer shows dashes after 10s (STALENESS_DASH_THRESHOLD) dims at 3s (STALENESS_DIM_THRESHOLD) |
| OVRL-06: OverlayService encapsulates platform calls | SATISFIED | All FlutterOverlayWindow calls isolated in OverlayService zero direct usage in OverlayProvider |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| lib/screens/overlay_screen.dart | 73 | Direct FlutterOverlayWindow.overlayListener usage in overlay isolate | Info | Expected - overlay screen runs in separate isolate and must use direct platform channel for receiving messages |
| lib/screens/overlay_screen.dart | 257 268 | Direct FlutterOverlayWindow calls in long press handler | Info | Expected - overlay screen cannot use OverlayService (separate isolate) must use direct platform channel |

**No blocker anti-patterns found.**

### Human Verification Required

**None required.** All success criteria are structurally verifiable through code analysis.

Optional manual testing to confirm runtime behavior:
1. Launch overlay - verify it appears and shows current speed/heading
2. Close main app to background - verify overlay continues receiving GPS updates
3. Wait 3 seconds without GPS movement - verify overlay dims speed display
4. Wait 10 seconds without GPS movement - verify overlay shows dashes
5. Move to trigger GPS update - verify overlay immediately shows new speed (no fade animation)
6. Deny overlay permission - verify snackbar appears with Settings button
7. Press Settings button - verify app settings page opens
8. Close overlay while app backgrounded - verify GPS continues for 30 seconds (grace period)

## Summary

**Phase 3 goal ACHIEVED.**

All 6 OVRL requirements satisfied:
- OVRL-01: Continuous GPS updates via stream subscription
- OVRL-02: Error surfacing via onError callback to SnackBar
- OVRL-03: Verified overlay creation via isActive check
- OVRL-04: Timestamp field in OverlayMessage
- OVRL-05: Two-stage staleness (3s dim 10s dashes)
- OVRL-06: OverlayService encapsulates all platform calls

**Key improvements delivered:**
1. Overlay communication is reliable (retry logic + verification)
2. Staleness detection provides clear visual feedback
3. Errors surface to user with actionable guidance
4. GPS grace period infrastructure ready for Phase 4
5. Clean separation of concerns (OverlayService isolates platform code)

**No gaps no blockers ready to proceed to Phase 4.**

**NOTE:** ROADMAP.md incorrectly states "2 seconds" for success criterion #2. The user explicitly decided on 3 seconds in CONTEXT.md and plan must-haves. Code correctly implements 3s dim / 10s dash thresholds per user decision.

---

*Verified: 2026-02-11T10:29:03Z*
*Verifier: Claude (gsd-verifier)*