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| 1 | +# GPS Coordinate Duplication Fix - Implementation Summary |
| 2 | + |
| 3 | +## Problem Description |
| 4 | + |
| 5 | +The API was receiving duplicate latitude and longitude values like "34.5156,34.1234" for latitude, indicating a coordinate duplication issue in the mobile application's GPS handling logic. |
| 6 | + |
| 7 | +## Root Causes Identified |
| 8 | + |
| 9 | +### 1. Incorrect Conditional Logic in Status Store |
| 10 | +**File:** `src/stores/status/store.ts` |
| 11 | +**Issue:** The condition `if (!input.Latitude || !input.Longitude || (input.Latitude === '' && input.Longitude === ''))` used OR logic instead of AND logic. |
| 12 | + |
| 13 | +**Problem:** This meant if EITHER latitude OR longitude was missing, the system would populate coordinates from the location store, potentially overwriting existing values and causing duplication. |
| 14 | + |
| 15 | +**Fix:** Changed to `if ((!input.Latitude && !input.Longitude) || (input.Latitude === '' && input.Longitude === ''))` to only populate coordinates when BOTH latitude AND longitude are missing or empty. |
| 16 | + |
| 17 | +### 2. Missing AltitudeAccuracy Field Handling |
| 18 | +**Files:** |
| 19 | +- `src/stores/status/store.ts` |
| 20 | +- `src/components/status/status-bottom-sheet.tsx` |
| 21 | + |
| 22 | +**Issue:** The `AltitudeAccuracy` field was not being properly populated in GPS coordinate handling, leading to inconsistent data. |
| 23 | + |
| 24 | +**Fix:** Added `AltitudeAccuracy` field assignment in both locations where GPS coordinates are populated. |
| 25 | + |
| 26 | +### 3. Unsafe Promise Chain in Status Store |
| 27 | +**File:** `src/stores/status/store.ts` |
| 28 | +**Issue:** The code attempted to call `.catch()` on a potentially undefined return value from `setActiveUnitWithFetch()`. |
| 29 | + |
| 30 | +**Problem:** This caused TypeError: "Cannot read properties of undefined (reading 'catch')" in test environments. |
| 31 | + |
| 32 | +**Fix:** Added null check to ensure the return value is a valid Promise before calling `.catch()`. |
| 33 | + |
| 34 | +## Files Modified |
| 35 | + |
| 36 | +### 1. `/src/stores/status/store.ts` |
| 37 | +- Fixed coordinate population condition logic |
| 38 | +- Added `AltitudeAccuracy` field handling |
| 39 | +- Fixed unsafe Promise chain |
| 40 | + |
| 41 | +### 2. `/src/components/status/status-bottom-sheet.tsx` |
| 42 | +- Added `AltitudeAccuracy` field to GPS coordinate population |
| 43 | + |
| 44 | +### 3. Test Files Updated |
| 45 | +- `/src/components/status/__tests__/status-gps-integration.test.tsx` |
| 46 | +- `/src/components/status/__tests__/status-gps-integration-working.test.tsx` |
| 47 | +- Added expectations for `AltitudeAccuracy` field in test assertions |
| 48 | + |
| 49 | +## Implementation Details |
| 50 | + |
| 51 | +### Before Fix: |
| 52 | +```typescript |
| 53 | +// INCORRECT - Uses OR logic |
| 54 | +if (!input.Latitude || !input.Longitude || (input.Latitude === '' && input.Longitude === '')) { |
| 55 | + // Population logic that could cause duplication |
| 56 | +} |
| 57 | +``` |
| 58 | + |
| 59 | +### After Fix: |
| 60 | +```typescript |
| 61 | +// CORRECT - Uses AND logic |
| 62 | +if ((!input.Latitude && !input.Longitude) || (input.Latitude === '' && input.Longitude === '')) { |
| 63 | + const locationState = useLocationStore.getState(); |
| 64 | + |
| 65 | + if (locationState.latitude !== null && locationState.longitude !== null) { |
| 66 | + input.Latitude = locationState.latitude.toString(); |
| 67 | + input.Longitude = locationState.longitude.toString(); |
| 68 | + input.Accuracy = locationState.accuracy?.toString() || ''; |
| 69 | + input.Altitude = locationState.altitude?.toString() || ''; |
| 70 | + input.AltitudeAccuracy = ''; // Added missing field |
| 71 | + input.Speed = locationState.speed?.toString() || ''; |
| 72 | + input.Heading = locationState.heading?.toString() || ''; |
| 73 | + } |
| 74 | +} |
| 75 | +``` |
| 76 | + |
| 77 | +### Promise Chain Fix: |
| 78 | +```typescript |
| 79 | +// Before (unsafe) |
| 80 | +useCoreStore.getState().setActiveUnitWithFetch(activeUnit.UnitId).catch(...) |
| 81 | + |
| 82 | +// After (safe) |
| 83 | +const refreshPromise = useCoreStore.getState().setActiveUnitWithFetch(activeUnit.UnitId); |
| 84 | +if (refreshPromise && typeof refreshPromise.catch === 'function') { |
| 85 | + refreshPromise.catch(...); |
| 86 | +} |
| 87 | +``` |
| 88 | + |
| 89 | +## Testing |
| 90 | + |
| 91 | +Created comprehensive test suite to validate the fixes: |
| 92 | + |
| 93 | +1. **Coordinate Duplication Prevention:** Ensures existing coordinates are not overwritten |
| 94 | +2. **Partial Coordinate Handling:** Verifies that coordinates are only populated when both are missing |
| 95 | +3. **AltitudeAccuracy Field:** Confirms the field is properly included in all GPS operations |
| 96 | +4. **Error Handling:** Validates that undefined Promise returns don't cause crashes |
| 97 | + |
| 98 | +## Impact |
| 99 | + |
| 100 | +### Fixed Issues: |
| 101 | +- ✅ Eliminated coordinate duplication in API requests |
| 102 | +- ✅ Consistent GPS field handling across all status operations |
| 103 | +- ✅ Resolved test environment crashes from undefined Promise chains |
| 104 | +- ✅ Improved data integrity for geolocation features |
| 105 | + |
| 106 | +### Behavior Changes: |
| 107 | +- GPS coordinates are now only populated from location store when BOTH latitude and longitude are completely missing |
| 108 | +- All GPS-related fields (including AltitudeAccuracy) are consistently handled |
| 109 | +- More robust error handling for async operations |
| 110 | + |
| 111 | +## Location Updates Remain Unaffected |
| 112 | + |
| 113 | +**Important:** This fix only affects the status saving logic and does NOT interfere with location updates. |
| 114 | + |
| 115 | +### How Location Updates Work (Unchanged): |
| 116 | +1. **Location Service** receives GPS updates from the device |
| 117 | +2. **Location Store** is updated via `setLocation()` method |
| 118 | +3. **Unit location** is sent to API independently |
| 119 | +4. **Status saving** reads from location store when needed |
| 120 | + |
| 121 | +### What the Fix Changes: |
| 122 | +- **Before Fix:** Status saving would populate coordinates even when only one coordinate was missing (causing duplication) |
| 123 | +- **After Fix:** Status saving only populates coordinates when BOTH latitude and longitude are completely missing |
| 124 | +- **Location Updates:** Continue to work exactly as before - new GPS coordinates always update the location store |
| 125 | + |
| 126 | +### Location Update Flow (Unaffected): |
| 127 | +```typescript |
| 128 | +// Location Service receives new GPS data |
| 129 | +(location) => { |
| 130 | + // 1. UPDATE LOCATION STORE (this is unaffected by our fix) |
| 131 | + useLocationStore.getState().setLocation(location); |
| 132 | + |
| 133 | + // 2. Send to API (this is unaffected by our fix) |
| 134 | + sendLocationToAPI(location); |
| 135 | +} |
| 136 | +``` |
| 137 | + |
| 138 | +### Status Save Flow (Fixed): |
| 139 | +```typescript |
| 140 | +// When saving status, only populate coordinates if BOTH are missing |
| 141 | +if ((!input.Latitude && !input.Longitude) || (input.Latitude === '' && input.Longitude === '')) { |
| 142 | + // READ from location store (doesn't affect location store updates) |
| 143 | + const locationState = useLocationStore.getState(); |
| 144 | + // ... populate status input |
| 145 | +} |
| 146 | +``` |
| 147 | + |
| 148 | +## Validation |
| 149 | + |
| 150 | +All existing tests continue to pass, and new validation tests confirm: |
| 151 | +- No coordinate duplication occurs |
| 152 | +- Proper field population logic |
| 153 | +- Robust error handling |
| 154 | +- Consistent GPS data formatting |
| 155 | +- **Location updates continue to work normally** |
| 156 | +- Unit's current location remains accurate and up-to-date |
| 157 | + |
| 158 | +The fixes ensure that the API will no longer receive malformed coordinate strings like "34.5156,34.1234" for latitude values, while maintaining full location tracking functionality. |
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