SportstimeAPI/.planning/phases/03-visual-flattening/03-01-SUMMARY.md

phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, duration, completed

phase	plan	subsystem	tags	requires	provides	affects	tech-stack	key-files	key-decisions	patterns-established	duration	completed
03-visual-flattening	01	ui	uitableview flattening sortorder swift	phase provides 01-semantic-position-model SortOrderProvider for game time → sortOrder conversion phase provides 02-constraint-validation ItineraryConstraints for drag validation	ItineraryFlattener pure utility for deterministic display ordering Refactored reloadData() using sortOrder-based flattening	03-02-flattening-tests 04-drag-drop	added patterns pure-function-for-flattening sortorder-based-display-ordering	created modified SportsTime/Core/Models/Domain/ItineraryFlattener.swift SportsTime/Features/Trip/Views/ItineraryTableViewController.swift	Day headers are not positioned items - always first in each day Games get sortOrder from SortOrderProvider.initialSortOrder(forGameTime:) Travel sortOrder looked up from itineraryItems by city name matching Pure flatten function enables unit testing without UITableView	ItineraryFlattener.flatten(): Pure function for hierarchical to flat conversion gamesByDay dictionary: Group games by day number before flattening	3min	2026-01-18

Phase 3 Plan 1: Visual Flattening Summary

Pure ItineraryFlattener utility replacing bucket-based flattening with sortOrder-based deterministic display ordering

Performance

• Duration: 3 min
• Started: 2026-01-18T21:52:57Z
• Completed: 2026-01-18T21:55:13Z
• Tasks: 2
• Files modified: 2

Accomplishments

• Created ItineraryFlattener enum with pure flatten() function
• Replaced bucket-based flattening (beforeGames/afterGames) with sortOrder sort
• Deterministic display order: same semantic state always produces same row order
• Updated architecture documentation to reflect sortOrder-based approach

Task Commits

Each task was committed atomically:

1. Task 1: Create ItineraryFlattener utility - fdfc912 (feat)
2. Task 2: Refactor reloadData() to use ItineraryFlattener - dd1fd82 (refactor)

Files Created/Modified

• SportsTime/Core/Models/Domain/ItineraryFlattener.swift - Pure flatten function with sortOrder-based ordering
• SportsTime/Features/Trip/Views/ItineraryTableViewController.swift - Refactored reloadData() to use flattener

Decisions Made

• Day headers not positioned: Day headers are always first in each day, not part of the sortOrder-based ordering. This is a structural anchor.
• Flattener is a pure function: No instance state, no side effects. Enables easy unit testing and guarantees determinism.
• gamesByDay dictionary: Built in reloadData() to pass to flattener rather than having flattener access day.games directly.

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• ItineraryFlattener ready for unit tests in plan 03-02
• reloadData() now uses pure flattening, enabling snapshot testing
• Phase 4 drag-drop can rely on deterministic flatten output

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Phase: 03-visual-flattening Completed: 2026-01-18