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