eb182c938b
Tasks completed: 2/2 - Create SortOrderProvider utility - Add day derivation methods to Trip SUMMARY: .planning/phases/01-semantic-position-model/01-01-SUMMARY.md
2.6 KiB
Project State: Itinerary Editor
Project Reference
Core Value: Drag-and-drop that operates on semantic positions (day + sortOrder), not row indices - so user intent is preserved across data reloads.
Current Focus: Phase 1 - Semantic Position Model (Plan 01 complete)
Current Position
Phase: 1 of 4 (Semantic Position Model) Plan: 1 of 2 complete Status: In progress Last activity: 2026-01-18 - Completed 01-01-PLAN.md
Progress: [#---------] 12.5%
Phase 1: [#####-----] 50% (1/2 plans)
Phase 2: [----------] Not Started
Phase 3: [----------] Not Started
Phase 4: [----------] Not Started
Performance Metrics
| Metric | Value |
|---|---|
| Total Requirements | 23 |
| Completed | 3 |
| Current Phase | 1 |
| Plans Executed | 1 |
Accumulated Context
Key Decisions
| Decision | Rationale | Phase |
|---|---|---|
| UITableView over SwiftUI List | SwiftUI drag-drop lacks insertion line precision | Pre-planning |
| (day, sortOrder) position model | Row indices break on reload; semantic position is stable | Pre-planning |
| Insertion lines (not zones) | User wants precise feedback on exact drop location | Pre-planning |
| Invalid drops rejected (snap back) | Cleaner than auto-clamping; user knows what happened | Pre-planning |
| Games get sortOrder from 100 + minutes since midnight | Range 100-1540 leaves room for negative sortOrder items | 01-01 |
| Normalization threshold at 1e-10 | Standard floating-point comparison for precision exhaustion | 01-01 |
| Day 1 = trip.startDate | 1-indexed, games belong to their start date | 01-01 |
Learned
- Previous attempts failed due to row-based thinking instead of semantic positioning
- Travel was incorrectly treated as structural ("travelBefore") instead of positional
- Hard-coded flatten order ignoring sortOrder caused reload issues
- SortOrderProvider provides static methods for all sortOrder calculations
- Trip extension provides instance methods for day number derivation
TODOs
- Create tests for semantic position persistence (Plan 01-02)
Blockers
None currently.
Session Continuity
Last Session: 2026-01-18T19:52:00Z Stopped at: Completed 01-01-PLAN.md Resume file: .planning/phases/01-semantic-position-model/01-02-PLAN.md
Context for Next Session
Plan 01-01 complete. SortOrderProvider utility created with 6 static methods. Trip extended with dayNumber(for:) and date(forDay:). Next: Plan 01-02 creates tests verifying semantic position persistence.
State initialized: 2026-01-18 Last updated: 2026-01-18