---
phase: 08-simplified-permissions
plan: 02
subsystem: viewmodel
tags: [permissions, simplified-mode, toggle, viewmodel, observable]
dependency_graph:
  requires: [RiskLevel, PermissionLevelMapping, SimplifiedPermissionEntry, PermissionSummary, PermissionSummaryBuilder]
  provides: [IsSimplifiedMode, IsDetailView, SimplifiedResults, Summaries, ActiveItemsSource]
  affects: [08-03, 08-04]
tech_stack:
  added: []
  patterns: [computed-property-from-cache, partial-method-change-handlers, mode-toggle-without-rescan]
key_files:
  created: []
  modified:
    - SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
decisions:
  - "ActiveItemsSource returns Results (raw) or SimplifiedResults depending on IsSimplifiedMode -- View binds to this single property"
  - "RebuildSimplifiedData called on toggle-on and after scan completion, not eagerly on every Results mutation"
  - "IsDetailView defaults to true so first toggle to simplified mode shows detailed rows"
  - "OnTenantSwitched resets SimplifiedResults and Summaries to empty arrays for clean state"
metrics:
  duration: 84s
  completed: 2026-04-07T12:10:22Z
  tasks_completed: 1
  tasks_total: 1
  files_created: 0
  files_modified: 1
---

# Phase 08 Plan 02: ViewModel Toggle Logic Summary

IsSimplifiedMode and IsDetailView toggles on PermissionsViewModel with computed SimplifiedResults, Summaries, and ActiveItemsSource -- all mode switches rebuild from cached Results without re-scanning SharePoint.

## Tasks Completed

### Task 1: Add simplified mode properties and summary computation to PermissionsViewModel
- **Commit:** e2c94bf
- **Files:** SharepointToolbox/ViewModels/Tabs/PermissionsViewModel.cs
- Added IsSimplifiedMode and IsDetailView observable properties with partial change handlers
- Added SimplifiedResults (IReadOnlyList<SimplifiedPermissionEntry>) and Summaries (IReadOnlyList<PermissionSummary>) as manually-raised properties
- Added ActiveItemsSource computed property returning correct collection for DataGrid binding
- RebuildSimplifiedData() wraps Results via SimplifiedPermissionEntry.WrapAll and builds summaries
- RunOperationAsync (both dispatcher and else branches) calls RebuildSimplifiedData when IsSimplifiedMode is active
- OnTenantSwitched resets SimplifiedResults and Summaries to empty arrays

## Deviations from Plan

None - plan executed exactly as written.

## Verification Results

- dotnet build succeeded with 0 errors, 0 warnings
- dotnet test PermissionsViewModelTests passed (1 passed, 0 failed, 0 skipped)
- IsSimplifiedMode, IsDetailView, SimplifiedResults, Summaries, ActiveItemsSource all present
- OnIsSimplifiedModeChanged calls RebuildSimplifiedData + raises ActiveItemsSource changed
- RunOperationAsync calls RebuildSimplifiedData when IsSimplifiedMode is true (both branches)
- OnTenantSwitched resets SimplifiedResults and Summaries

## Self-Check: PASSED

All modified files exist on disk. Task commit (e2c94bf) verified in git log. All 6 new members confirmed present in PermissionsViewModel.cs (26 occurrences across declarations, usages, and doc comments).