SportstimeAPI/.planning/phases/01-semantic-position-model/01-01-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
01-semantic-position-model	01	domain	swift sortOrder calendar trip itinerary		SortOrderProvider utility with 6 static methods for sortOrder calculation Trip.dayNumber(for:) and Trip.date(forDay:) for semantic day derivation	01-02-PLAN (tests depend on these utilities) Phase 2 constraint validation (will use sortOrder utilities) Phase 3 visual flattening (will sort by sortOrder)	added patterns SortOrderProvider enum with static methods for sortOrder calculation Double-based sortOrder with midpoint insertion (~52 insertions before precision loss) 1-indexed day numbering relative to trip.startDate	created modified SportsTime/Core/Models/Domain/SortOrderProvider.swift SportsTime/Core/Models/Domain/Trip.swift	Games get sortOrder from 100 + minutes since midnight (range 100-1540) Midpoint insertion via (above + below) / 2.0 Normalization threshold at 1e-10 gap between adjacent items Day 1 = trip.startDate, games belong to their start date	SortOrderProvider.initialSortOrder(forGameTime:) for deriving sortOrder from game time SortOrderProvider.sortOrderBetween(_:_:) for insertion between items Trip.dayNumber(for:) and Trip.date(forDay:) for semantic day calculation	3min	2026-01-18

Phase 1 Plan 1: SortOrder Utilities Summary

SortOrderProvider enum with 6 static methods for sortOrder calculation plus Trip.dayNumber/date(forDay:) for semantic day derivation

Performance

• Duration: 3 min
• Started: 2026-01-18T19:49:28Z
• Completed: 2026-01-18T19:52:00Z
• Tasks: 2
• Files modified: 2

Accomplishments

• Created SortOrderProvider utility with all sortOrder calculation methods
• Added day derivation methods to Trip for semantic (day, sortOrder) positioning
• Both files compile successfully with no warnings

Task Commits

Each task was committed atomically:

1. Task 1: Create SortOrderProvider utility - 9915ad3 (feat)
2. Task 2: Add day derivation methods to Trip - 6d43edf (feat)

Files Created/Modified

• SportsTime/Core/Models/Domain/SortOrderProvider.swift - Enum with 6 static methods: initialSortOrder(forGameTime:), sortOrderBetween(::), sortOrderBefore(:), sortOrderAfter(:), needsNormalization(:), normalize(:)
• SportsTime/Core/Models/Domain/Trip.swift - Added extension with dayNumber(for:) and date(forDay:) instance methods

Decisions Made

None - followed plan as specified. Research document provided complete implementation guidance.

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None.

User Setup Required

None - no external service configuration required.

Next Phase Readiness

• SortOrderProvider and Trip day derivation methods ready for use
• Plan 01-02 can now create tests verifying semantic position persistence
• All 6 SortOrderProvider methods are static and publicly accessible
• Trip extension methods are instance methods callable on any Trip value

---

Phase: 01-semantic-position-model Completed: 2026-01-18