---
phase: 08-simplified-permissions
plan: 01
subsystem: core-models
tags: [permissions, risk-level, mapping, data-models]
dependency_graph:
  requires: []
  provides: [RiskLevel, PermissionLevelMapping, SimplifiedPermissionEntry, PermissionSummary, PermissionSummaryBuilder]
  affects: [08-02, 08-03, 08-04, 08-05]
tech_stack:
  added: []
  patterns: [wrapper-pattern, static-mapping, enum-based-classification]
key_files:
  created:
    - SharepointToolbox/Core/Models/RiskLevel.cs
    - SharepointToolbox/Core/Helpers/PermissionLevelMapping.cs
    - SharepointToolbox/Core/Models/SimplifiedPermissionEntry.cs
    - SharepointToolbox/Core/Models/PermissionSummary.cs
  modified: []
decisions:
  - "RiskLevel enum uses ordinal ordering (High=0) so Min() gives highest risk"
  - "Unknown/custom roles default to Medium risk (conservative — forces admin review)"
  - "SimplifiedPermissionEntry is a class (not record) to support passthrough properties for DataGrid binding"
  - "PermissionSummaryBuilder always returns all 4 risk levels even with count 0 for consistent UI layout"
metrics:
  duration: 77s
  completed: 2026-04-07T12:06:57Z
  tasks_completed: 2
  tasks_total: 2
  files_created: 4
  files_modified: 0
---

# Phase 08 Plan 01: Permission Data Models and Mapping Layer Summary

RiskLevel enum, PermissionLevelMapping static helper with 11 standard SharePoint role mappings, SimplifiedPermissionEntry wrapper preserving PermissionEntry immutability, and PermissionSummaryBuilder for grouped risk-level counts.

## Tasks Completed

### Task 1: Create RiskLevel enum and PermissionLevelMapping helper
- **Commit:** f1390ea
- **Files:** RiskLevel.cs, PermissionLevelMapping.cs
- Created 4-value RiskLevel enum (High, Medium, Low, ReadOnly)
- PermissionLevelMapping maps 11 standard SharePoint roles to plain-language labels
- Case-insensitive dictionary lookup with Medium fallback for unknown roles
- GetMapping, GetMappings, GetHighestRisk, GetSimplifiedLabels methods

### Task 2: Create SimplifiedPermissionEntry wrapper and PermissionSummary model
- **Commit:** 6609f2a
- **Files:** SimplifiedPermissionEntry.cs, PermissionSummary.cs
- SimplifiedPermissionEntry wraps PermissionEntry via Inner property
- Computed SimplifiedLabels, RiskLevel, and Mappings at construction time
- All 9 passthrough properties for DataGrid binding compatibility
- Static WrapAll factory method for bulk conversion
- PermissionSummary record with Label, RiskLevel, Count, DistinctUsers
- PermissionSummaryBuilder.Build returns all 4 risk levels for consistent UI binding

## Deviations from Plan

None - plan executed exactly as written.

## Verification Results

- dotnet build succeeded with 0 errors, 0 warnings
- RiskLevel.cs has High, Medium, Low, ReadOnly values
- PermissionLevelMapping has 11 known role mappings
- SimplifiedPermissionEntry wraps PermissionEntry without modifying it
- PermissionSummaryBuilder.Build returns 4 summary entries
- PermissionEntry.cs confirmed unmodified (git diff empty)

## Self-Check: PASSED

All 4 created files exist on disk. Both task commits (f1390ea, 6609f2a) verified in git log.