---
phase: 11-html-export-branding
plan: 01
subsystem: export
tags: [html-export, branding, csharp, tdd, dotnet]

# Dependency graph
requires:
  - phase: 10-branding-data-foundation
    provides: LogoData record with Base64 and MimeType properties
provides:
  - ReportBranding positional record bundling MspLogo and ClientLogo as nullable LogoData
  - BrandingHtmlHelper static class generating flex branding header HTML fragment
  - 8 unit tests covering all logo combination states
affects:
  - 11-02 (export services inject BrandingHtmlHelper.BuildBrandingHeader)
  - 11-03 (ViewModels assemble ReportBranding from IBrandingService and TenantProfile)

# Tech tracking
tech-stack:
  added: []
  patterns:
    - "Internal static helper class with single static method for HTML fragment generation"
    - "Positional record as simple DTO for passing logo pair to export pipeline"
    - "InternalsVisibleTo via MSBuild AssemblyAttribute ItemGroup (not AssemblyInfo.cs)"

key-files:
  created:
    - SharepointToolbox/Core/Models/ReportBranding.cs
    - SharepointToolbox/Services/Export/BrandingHtmlHelper.cs
    - SharepointToolbox.Tests/Services/Export/BrandingHtmlHelperTests.cs
  modified:
    - SharepointToolbox/SharepointToolbox.csproj

key-decisions:
  - "BrandingHtmlHelper is internal — only used within Services.Export namespace, tests access via InternalsVisibleTo"
  - "InternalsVisibleTo added via MSBuild AssemblyAttribute ItemGroup rather than AssemblyInfo.cs"
  - "ReportBranding is a positional record — always constructed in code, never deserialized from JSON"
  - "Returns empty string (not null) when no branding — callers need no null checks"
  - "Flex spacer div only added when both logos present — single logo has no wasted space"

patterns-established:
  - "HTML helper returns empty string for no-op case — safe to concatenate without null guard"
  - "data-URI inline format: src=\"data:{MimeType};base64,{Base64}\" for self-contained HTML reports"
  - "alt=\"\" on decorative logos — accessibility-correct for non-content images"

requirements-completed: [BRAND-05]

# Metrics
duration: 15min
completed: 2026-04-08
---

# Phase 11 Plan 01: ReportBranding Model and BrandingHtmlHelper Summary

**ReportBranding DTO and BrandingHtmlHelper static class producing flex-layout data-URI branding header HTML for all 5 HTML export services**

## Performance

- **Duration:** ~15 min
- **Started:** 2026-04-08T12:31:52Z
- **Completed:** 2026-04-08T12:46:00Z
- **Tasks:** 1 (TDD: RED → GREEN)
- **Files modified:** 4

## Accomplishments

- Created `ReportBranding` positional record bundling nullable `MspLogo` and `ClientLogo` LogoData properties
- Created `BrandingHtmlHelper` static class with `BuildBrandingHeader` covering all 4 logo states: null branding, both null, single logo, both logos
- Wrote 8 unit tests (TDD) asserting HTML structure: data-URI format, flex layout, max-height/max-width, spacer presence/absence
- Added `InternalsVisibleTo` to project file enabling tests to access `internal` BrandingHtmlHelper

## Task Commits

Each task was committed atomically:

1. **Task 1: Create ReportBranding record and BrandingHtmlHelper with tests** - `212c439` (feat)

**Plan metadata:** *(final metadata commit — see below)*

_Note: TDD task completed in single commit (RED confirmed via build error, GREEN verified with all 8 tests passing)_

## Files Created/Modified

- `SharepointToolbox/Core/Models/ReportBranding.cs` - Positional record with MspLogo and ClientLogo nullable LogoData properties
- `SharepointToolbox/Services/Export/BrandingHtmlHelper.cs` - Internal static class generating flex branding header HTML fragment
- `SharepointToolbox.Tests/Services/Export/BrandingHtmlHelperTests.cs` - 8 unit tests covering all logo combination states
- `SharepointToolbox/SharepointToolbox.csproj` - Added InternalsVisibleTo for SharepointToolbox.Tests

## Decisions Made

- Used `AssemblyAttribute` ItemGroup in `.csproj` instead of `AssemblyInfo.cs` for `InternalsVisibleTo` — consistent with modern SDK-style project approach
- `BrandingHtmlHelper` stays `internal` — it is purely an implementation detail of the export services layer, not a public API

## Deviations from Plan

None - plan executed exactly as written.

## Issues Encountered

None.

## User Setup Required

None - no external service configuration required.

## Next Phase Readiness

- `ReportBranding` and `BrandingHtmlHelper` are ready for Plan 02 which adds optional branding parameters to all 5 HTML export services
- All 8 unit tests pass; build succeeds with 0 warnings

---
*Phase: 11-html-export-branding*
*Completed: 2026-04-08*