---
phase: 01-foundation
plan: 05
subsystem: localization
tags: [wpf, dotnet10, serilog, localization, resx, i18n, csharp, tdd]

# Dependency graph
requires:
  - 01-02 (LogPanelSink, LanguageChangedMessage)
provides:
  - TranslationSource singleton with INotifyPropertyChanged indexer for runtime culture switching
  - Strings.resx with 27 Phase 1 EN UI strings
  - Strings.fr.resx with same 27 keys stubbed for Phase 5 FR translation
  - LoggingIntegrationTests verifying Serilog rolling file sink and LogPanelSink type
affects:
  - 01-06 (MainWindow.xaml binds via TranslationSource.Instance[key])
  - 01-07 (SettingsViewModel sets TranslationSource.Instance.CurrentCulture)
  - 02-xx (all feature views use localized strings via TranslationSource)

# Tech tracking
tech-stack:
  added: []
  patterns:
    - TranslationSource singleton with INotifyPropertyChanged empty-string key (signals all bindings refresh)
    - WPF binding: Source={x:Static loc:TranslationSource.Instance}, Path=[key]
    - ResourceManager from Strings.Designer.cs — manually maintained for dotnet build (no ResXFileCodeGenerator at build time)
    - EmbeddedResource Update (not Include) in SDK-style project — avoids NETSDK1022 duplicate error
    - IDisposable test teardown with TranslationSource culture reset — prevents test pollution

key-files:
  created:
    - SharepointToolbox/Localization/TranslationSource.cs
    - SharepointToolbox/Localization/Strings.resx
    - SharepointToolbox/Localization/Strings.fr.resx
    - SharepointToolbox/Localization/Strings.Designer.cs
  modified:
    - SharepointToolbox/SharepointToolbox.csproj
    - SharepointToolbox/App.xaml.cs
    - SharepointToolbox.Tests/Localization/TranslationSourceTests.cs
    - SharepointToolbox.Tests/Integration/LoggingIntegrationTests.cs

key-decisions:
  - "Strings.Designer.cs is maintained manually — ResXFileCodeGenerator is a VS-only tool; dotnet build requires the designer file to pre-exist; only the ResourceManager accessor is needed (no per-key typed properties)"
  - "EmbeddedResource uses Update not Include — SDK-style projects auto-include all .resx as EmbeddedResource; using Include causes NETSDK1022 duplicate error"
  - "System.IO using added explicitly in test project — xunit test project implicit usings do not cover System.IO; consistent with existing pattern in main project"

requirements-completed:
  - FOUND-08
  - FOUND-09

# Metrics
duration: 4min
completed: 2026-04-02
---

# Phase 1 Plan 05: Logging Infrastructure and Dynamic Localization Summary

**TranslationSource singleton + EN/FR resx + Serilog integration tests — 26 tests pass (24 Unit, 2 Integration), 0 errors, 0 warnings**

## Performance

- **Duration:** 4 min
- **Started:** 2026-04-02T10:14:23Z
- **Completed:** 2026-04-02T10:18:08Z
- **Tasks:** 2
- **Files modified:** 8

## Accomplishments

- TranslationSource singleton implements INotifyPropertyChanged; indexer `[key]` uses ResourceManager for runtime culture switching without restart
- PropertyChanged fires with `string.Empty` PropertyName on culture change — WPF re-evaluates all bindings to TranslationSource.Instance
- Missing key returns `[key]` placeholder — prevents NullReferenceException in WPF bindings
- Same-culture assignment is no-op — equality check prevents spurious PropertyChanged events
- Strings.resx: 27 Phase 1 UI strings (EN): app, toolbar, tab, button, settings, profile, status, and error keys
- Strings.fr.resx: same 27 keys, EN values stubbed, marked `<!-- FR stub — Phase 5 -->`
- Strings.Designer.cs: ResourceManager accessor for dotnet build compatibility (no VS ResXFileCodeGenerator dependency)
- LoggingIntegrationTests: verifies Serilog creates a rolling log file and writes message content; verifies LogPanelSink implements ILogEventSink
- App.xaml.cs: comment added documenting deferred LogPanelSink DI registration (plan 01-06)

## Task Commits

1. **Task 1 RED: Failing tests for TranslationSource** - `8a58140` (test)
2. **Task 1 GREEN: TranslationSource + resx files implementation** - `a287ed8` (feat)
3. **Task 2: Serilog integration tests + App.xaml.cs comment** - `1c532d1` (feat)

## Files Created/Modified

- `SharepointToolbox/Localization/TranslationSource.cs` — Singleton; INotifyPropertyChanged indexer; empty-string PropertyChanged; culture equality guard
- `SharepointToolbox/Localization/Strings.resx` — 27 Phase 1 EN string resources
- `SharepointToolbox/Localization/Strings.fr.resx` — 27 keys stubbed with EN values; Phase 5 FR completion
- `SharepointToolbox/Localization/Strings.Designer.cs` — ResourceManager accessor; manually maintained for dotnet build
- `SharepointToolbox/SharepointToolbox.csproj` — EmbeddedResource Update metadata for resx files
- `SharepointToolbox/App.xaml.cs` — LogPanelSink registration comment deferred to plan 01-06
- `SharepointToolbox.Tests/Localization/TranslationSourceTests.cs` — 6 unit tests; IDisposable teardown for culture reset
- `SharepointToolbox.Tests/Integration/LoggingIntegrationTests.cs` — 2 integration tests; temp dir cleanup in Dispose

## Decisions Made

- Strings.Designer.cs maintained manually: `ResXFileCodeGenerator` is a Visual Studio design-time tool not available in `dotnet build`. The designer file only needs the `ResourceManager` property accessor — no per-key typed properties are needed since TranslationSource uses `ResourceManager.GetString(key, culture)` directly.
- `EmbeddedResource Update` instead of `Include`: SDK-style projects implicitly include all `.resx` files as `EmbeddedResource`. Using `Include` causes `NETSDK1022` duplicate build error. `Update` sets metadata on the already-included item.
- Explicit `System.IO` using in test file: test project implicit usings do not cover `System.IO`; consistent with the established pattern for the main project (prior decision FOUND-10).

## Deviations from Plan

### Auto-fixed Issues

**1. [Rule 3 - Blocking] Added explicit System.IO using to LoggingIntegrationTests.cs**
- **Found during:** Task 2 (dotnet build)
- **Issue:** CS0103 — `Path`, `Directory`, `File` not found; test project implicit usings do not include System.IO
- **Fix:** Added `using System.IO;` to the test file
- **Files modified:** `SharepointToolbox.Tests/Integration/LoggingIntegrationTests.cs`
- **Verification:** Build 0 errors, 0 warnings after fix
- **Committed in:** 1c532d1 (Task 2 commit)

**2. [Rule 3 - Blocking] Used EmbeddedResource Update (not Include) for resx metadata**
- **Found during:** Task 1 GREEN (dotnet build)
- **Issue:** NETSDK1022 duplicate EmbeddedResource — SDK auto-includes all .resx files; explicit Include causes duplicate error
- **Fix:** Changed `<EmbeddedResource Include=...>` to `<EmbeddedResource Update=...>` in SharepointToolbox.csproj
- **Files modified:** `SharepointToolbox/SharepointToolbox.csproj`
- **Verification:** Build 0 errors, 0 warnings after fix
- **Committed in:** a287ed8 (Task 1 commit)

**3. [Rule 3 - Blocking] Created Strings.Designer.cs manually**
- **Found during:** Task 1 GREEN (dotnet build)
- **Issue:** `Strings` class does not exist in context — ResXFileCodeGenerator is VS-only, not run by dotnet build CLI
- **Fix:** Created Strings.Designer.cs with ResourceManager accessor manually; only the `ResourceManager` property is needed (TranslationSource uses it directly)
- **Files modified:** `SharepointToolbox/Localization/Strings.Designer.cs`
- **Verification:** Build 0 errors after fix; TranslationSourceTests pass
- **Committed in:** a287ed8 (Task 1 commit)

---

**Total deviations:** 3 auto-fixed (all Rule 3 — blocking build issues)
**Impact on plan:** All fixes minor; no scope creep; no behavior change from plan intent.

## Issues Encountered

None beyond the auto-fixed deviations above.

## User Setup Required

None — no external service configuration required.

## Next Phase Readiness

- TranslationSource.Instance ready for WPF XAML binding in plan 01-06 (MainWindow)
- All 27 Phase 1 UI string keys defined in EN resx
- FR resx keyset matches EN — Phase 5 can add translations without key changes
- Serilog rolling file sink verified working; LogPanelSink type verified ILogEventSink-compatible
- Plan 01-06 can proceed immediately

## Self-Check: PASSED

- FOUND: SharepointToolbox/Localization/TranslationSource.cs
- FOUND: SharepointToolbox/Localization/Strings.resx
- FOUND: SharepointToolbox/Localization/Strings.fr.resx
- FOUND: SharepointToolbox/Localization/Strings.Designer.cs
- FOUND: SharepointToolbox.Tests/Localization/TranslationSourceTests.cs
- FOUND: SharepointToolbox.Tests/Integration/LoggingIntegrationTests.cs
- FOUND: .planning/phases/01-foundation/01-05-SUMMARY.md
- Commit 8a58140: test(01-05): add failing tests for TranslationSource singleton
- Commit a287ed8: feat(01-05): implement TranslationSource singleton + EN/FR resx files
- Commit 1c532d1: feat(01-05): add Serilog integration tests and App.xaml.cs LogPanelSink comment

---
*Phase: 01-foundation*
*Completed: 2026-04-02*