---
phase: 10-branding-data-foundation
plan: "02"
subsystem: api
tags: [microsoft-graph, graph-sdk, pagination, page-iterator, csharp, directory-service]

# Dependency graph
requires:
  - phase: 10-branding-data-foundation-01
    provides: "GraphClientFactory (existing) and project infrastructure"
provides:
  - "GraphDirectoryUser record (DisplayName, UPN, Mail, Department, JobTitle)"
  - "IGraphUserDirectoryService interface with GetUsersAsync(clientId, progress, ct)"
  - "GraphUserDirectoryService implementation with PageIterator-based pagination"
  - "MapUser static method testable without live Graph endpoint"
  - "GraphUserDirectoryServiceTests with 5 unit tests for mapping logic"
affects:
  - phase-13-user-directory-viewmodel
  - phase-14-user-directory-ui

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "PageIterator<User, UserCollectionResponse> for multi-page Graph enumeration"
    - "Cancellation-in-callback pattern: callback returns false when ct.IsCancellationRequested"
    - "IProgress<int> reporting running count for ViewModel loading feedback"
    - "AppGraphClientFactory alias to disambiguate SharepointToolbox.Infrastructure.Auth.GraphClientFactory from Microsoft.Graph.GraphClientFactory"
    - "Extract MapUser as internal static for direct unit testability without live Graph"

key-files:
  created:
    - SharepointToolbox/Core/Models/GraphDirectoryUser.cs
    - SharepointToolbox/Services/IGraphUserDirectoryService.cs
    - SharepointToolbox/Services/GraphUserDirectoryService.cs
    - SharepointToolbox.Tests/Services/GraphUserDirectoryServiceTests.cs
  modified: []

key-decisions:
  - "No ConsistencyLevel: eventual header on the directory filter (accountEnabled eq true and userType eq 'Member') — standard equality filter does not require it, unlike startsWith queries in GraphUserSearchService"
  - "MapUser extracted as internal static method to decouple mapping logic from PageIterator, enabling direct unit tests without a live Graph client"
  - "Integration tests for pagination/cancellation skipped with documented rationale — PageIterator uses internal GraphServiceClient internals not mockable via Moq"
  - "Type alias AppGraphClientFactory used to resolve ambiguity with Microsoft.Graph.GraphClientFactory in the same namespace"

patterns-established:
  - "IProgress<int> optional progress pattern: pass null for no reporting, non-null for ViewModel loading UX"
  - "PageIterator cancellation: check ct.IsCancellationRequested inside callback, return false to stop"

requirements-completed:
  - BRAND-06

# Metrics
duration: 4min
completed: 2026-04-08
---

# Phase 10 Plan 02: Graph User Directory Service Summary

**Graph SDK PageIterator service for full-tenant member enumeration with cancellation, progress reporting, and 5-field user mapping**

## Performance

- **Duration:** 4 min
- **Started:** 2026-04-08T10:28:36Z
- **Completed:** 2026-04-08T10:32:20Z
- **Tasks:** 2
- **Files modified:** 4 created

## Accomplishments

- GraphDirectoryUser record with all 5 required fields (DisplayName, UPN, Mail, Department, JobTitle)
- IGraphUserDirectoryService interface with IProgress<int> optional parameter for loading feedback
- GraphUserDirectoryService using PageIterator for transparent multi-page Graph enumeration with callback-based cancellation
- 5 unit tests covering all MapUser field-mapping scenarios including null fallback chains

## Task Commits

Each task was committed atomically:

1. **Task 1: Create GraphDirectoryUser model and IGraphUserDirectoryService interface** - `5e56a96` (feat)
2. **Task 2: Implement GraphUserDirectoryService with PageIterator and tests** - `3ba5746` (feat)

## Files Created/Modified

- `SharepointToolbox/Core/Models/GraphDirectoryUser.cs` - Positional record with 5 fields for directory enumeration results
- `SharepointToolbox/Services/IGraphUserDirectoryService.cs` - Interface with GetUsersAsync(clientId, IProgress<int>?, CancellationToken)
- `SharepointToolbox/Services/GraphUserDirectoryService.cs` - PageIterator implementation, cancellation in callback, progress reporting, no ConsistencyLevel header
- `SharepointToolbox.Tests/Services/GraphUserDirectoryServiceTests.cs` - 5 MapUser unit tests + 4 integration tests skipped with documented rationale

## Decisions Made

- No ConsistencyLevel header on the equality filter (different from GraphUserSearchService which uses startsWith and requires eventual consistency)
- MapUser extracted as internal static to allow direct unit testing of mapping logic without requiring PageIterator and a live Graph client
- Integration-level tests for pagination/cancellation documented as skipped: PageIterator's internal request execution is not mockable via Moq without a real GraphServiceClient

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 1 - Bug] Resolved ambiguous GraphClientFactory reference**
- **Found during:** Task 2 (GraphUserDirectoryService implementation)
- **Issue:** `using Microsoft.Graph;` combined with `using SharepointToolbox.Infrastructure.Auth;` created an ambiguous reference — both namespaces define `GraphClientFactory`. Build error CS0104.
- **Fix:** Added type alias `using AppGraphClientFactory = SharepointToolbox.Infrastructure.Auth.GraphClientFactory;` and removed the generic using for the auth namespace.
- **Files modified:** `SharepointToolbox/Services/GraphUserDirectoryService.cs`
- **Verification:** `dotnet build SharepointToolbox/SharepointToolbox.csproj --no-restore -warnaserror` succeeds with 0 warnings, 0 errors.
- **Committed in:** `3ba5746` (Task 2 commit)

---

**Total deviations:** 1 auto-fixed (Rule 1 - Bug)
**Impact on plan:** Fix necessary for compilation. No scope creep.

## Issues Encountered

- Pre-existing `BrandingServiceTests.cs` (untracked) references `BrandingService` types not yet created (awaiting full plan 10-01 execution). This prevented `dotnet test` from running after rebuilding the test project. Tests were verified to compile via direct inspection; main project builds with zero warnings. Logged in `deferred-items.md`. Will be resolved when plan 10-01 is fully executed.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- GraphUserDirectoryService is ready for injection into Phase 13's User Directory ViewModel
- IProgress<int> parameter provides the running count hook Phase 13 needs for "Loading... X users" UX
- Pending real-tenant verification of the filter (noted in STATE.md and code comment)
- BrandingService (plan 10-01 remainder) must be completed to restore test project compilation

---
*Phase: 10-branding-data-foundation*
*Completed: 2026-04-08*
