---
phase: 03-visual-flattening
verified: 2026-01-18T22:30:00Z
status: passed
score: 7/7 must-haves verified
re_verification: false
---

# Phase 3: Visual Flattening Verification Report

**Phase Goal:** Semantic items flatten to display rows deterministically, sorted by sortOrder.
**Verified:** 2026-01-18T22:30:00Z
**Status:** passed
**Re-verification:** No - initial verification

## Goal Achievement

### Observable Truths

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | Items with lower sortOrder appear before items with higher sortOrder | VERIFIED | ItineraryFlattener.swift:93 sorts by sortOrder ascending |
| 2 | Items with sortOrder < 0 appear before games | VERIFIED | Test `success_negativeSortOrderAppearsBeforeGames` passes |
| 3 | Items with sortOrder >= 0 appear after or between games | VERIFIED | Tests `flatten_gamesGetSortOrderFromTime*` pass; games have sortOrder 100+minutes |
| 4 | Day headers always appear first in each day's section | VERIFIED | Test `flatten_dayHeaderAlwaysFirst` passes; ItineraryFlattener.swift:58 appends header first |
| 5 | Same semantic state produces identical row order | VERIFIED | Test `success_sameStateProducesIdenticalOrder` passes |
| 6 | Item with sortOrder -1.0 appears before all games | VERIFIED | Test `success_negativeSortOrderAppearsBeforeGames` explicitly tests this |
| 7 | Reordering an item and re-flattening preserves new order | VERIFIED | Test `success_reorderPreservesNewOrder` passes |

**Score:** 7/7 truths verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `SportsTime/Core/Models/Domain/ItineraryFlattener.swift` | Pure flatten function | VERIFIED | 124 lines, exports `flatten(days:itineraryItems:gamesByDay:)`, no stubs |
| `SportsTime/Features/Trip/Views/ItineraryTableViewController.swift` | Refactored reloadData() using ItineraryFlattener | VERIFIED | Line 444 calls `ItineraryFlattener.flatten()`, no beforeGames/afterGames buckets |
| `SportsTimeTests/Domain/ItineraryFlattenerTests.swift` | Determinism and ordering tests | VERIFIED | 765 lines, 13 tests, all pass |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| `ItineraryTableViewController.reloadData()` | `ItineraryFlattener.flatten()` | function call | WIRED | Line 444 calls flattener with days, itineraryItems, gamesByDay |
| `ItineraryFlattenerTests` | `ItineraryFlattener.flatten()` | test assertions | WIRED | 13 tests call flatten and verify output |

### Requirements Coverage

| Requirement | Status | Evidence |
|-------------|--------|----------|
| FLAT-01: Visual flattening sorts by sortOrder within each day | SATISFIED | `positioned.sort { $0.sortOrder < $1.sortOrder }` at line 93 |
| FLAT-02: Flattening is deterministic and stateless | SATISFIED | Pure function enum with no instance state; test confirms identical output |
| FLAT-03: sortOrder < 0 for "before games", >= 0 for "after/between games" | SATISFIED | Games get sortOrder 100+minutes; negative sortOrder items sort before |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| None | - | - | - | No anti-patterns detected |

Scanned files:
- `ItineraryFlattener.swift`: No TODO/FIXME/placeholder/stub patterns
- `ItineraryTableViewController.swift`: No beforeGames/afterGames bucket logic remains

### Human Verification Required

None - all phase goals are verifiable programmatically through:
1. Code inspection (sortOrder-based sorting logic)
2. Automated tests (13 passing tests covering all success criteria)

### Verification Summary

Phase 3 goal fully achieved:

1. **ItineraryFlattener utility created** - Pure function that transforms hierarchical day data into flat display rows sorted by sortOrder
2. **reloadData() refactored** - Now uses `ItineraryFlattener.flatten()` instead of bucket-based beforeGames/afterGames approach
3. **Determinism verified** - Same semantic state produces identical row order (tested)
4. **sortOrder conventions enforced** - Negative sortOrder items appear before games, positive after/between

The old bucket-based flattening code has been completely removed. The new implementation is pure, testable, and deterministic.

---

*Verified: 2026-01-18T22:30:00Z*
*Verifier: Claude (gsd-verifier)*