102 lines
3.2 KiB
Markdown
102 lines
3.2 KiB
Markdown
---
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phase: 03-visual-flattening
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plan: 01
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subsystem: ui
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tags: [uitableview, flattening, sortorder, swift]
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# Dependency graph
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requires:
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- phase: 01-semantic-position-model
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provides: SortOrderProvider for game time → sortOrder conversion
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- phase: 02-constraint-validation
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provides: ItineraryConstraints for drag validation
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provides:
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- ItineraryFlattener pure utility for deterministic display ordering
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- Refactored reloadData() using sortOrder-based flattening
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affects: [03-02-flattening-tests, 04-drag-drop]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [pure-function-for-flattening, sortorder-based-display-ordering]
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key-files:
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created:
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- SportsTime/Core/Models/Domain/ItineraryFlattener.swift
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modified:
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- SportsTime/Features/Trip/Views/ItineraryTableViewController.swift
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key-decisions:
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- "Day headers are not positioned items - always first in each day"
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- "Games get sortOrder from SortOrderProvider.initialSortOrder(forGameTime:)"
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- "Travel sortOrder looked up from itineraryItems by city name matching"
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- "Pure flatten function enables unit testing without UITableView"
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patterns-established:
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- "ItineraryFlattener.flatten(): Pure function for hierarchical to flat conversion"
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- "gamesByDay dictionary: Group games by day number before flattening"
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# Metrics
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duration: 3min
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completed: 2026-01-18
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---
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# Phase 3 Plan 1: Visual Flattening Summary
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**Pure ItineraryFlattener utility replacing bucket-based flattening with sortOrder-based deterministic display ordering**
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## Performance
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- **Duration:** 3 min
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- **Started:** 2026-01-18T21:52:57Z
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- **Completed:** 2026-01-18T21:55:13Z
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- **Tasks:** 2
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- **Files modified:** 2
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## Accomplishments
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- Created `ItineraryFlattener` enum with pure `flatten()` function
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- Replaced bucket-based flattening (beforeGames/afterGames) with sortOrder sort
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- Deterministic display order: same semantic state always produces same row order
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- Updated architecture documentation to reflect sortOrder-based approach
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Create ItineraryFlattener utility** - `fdfc912` (feat)
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2. **Task 2: Refactor reloadData() to use ItineraryFlattener** - `dd1fd82` (refactor)
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## Files Created/Modified
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- `SportsTime/Core/Models/Domain/ItineraryFlattener.swift` - Pure flatten function with sortOrder-based ordering
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- `SportsTime/Features/Trip/Views/ItineraryTableViewController.swift` - Refactored reloadData() to use flattener
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## Decisions Made
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- **Day headers not positioned:** Day headers are always first in each day, not part of the sortOrder-based ordering. This is a structural anchor.
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- **Flattener is a pure function:** No instance state, no side effects. Enables easy unit testing and guarantees determinism.
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- **gamesByDay dictionary:** Built in reloadData() to pass to flattener rather than having flattener access day.games directly.
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None.
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## User Setup Required
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None - no external service configuration required.
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## Next Phase Readiness
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- ItineraryFlattener ready for unit tests in plan 03-02
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- reloadData() now uses pure flattening, enabling snapshot testing
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- Phase 4 drag-drop can rely on deterministic flatten output
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---
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*Phase: 03-visual-flattening*
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*Completed: 2026-01-18*
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