---
phase: 09-storage-visualization
verified: 2026-04-07T15:00:00Z
status: passed
score: 4/4 success criteria verified
re_verification: false
---

# Phase 9: Storage Visualization Verification Report

**Phase Goal:** The Storage Metrics tab displays an interactive chart of space consumption by file type, togglable between pie/donut and bar chart views
**Verified:** 2026-04-07
**Status:** PASSED
**Re-verification:** No -- initial verification

## Goal Achievement

### Observable Truths (Success Criteria)

| # | Truth | Status | Evidence |
|---|-------|--------|----------|
| 1 | A WPF charting library (LiveCharts2) is integrated as a NuGet dependency and renders correctly in the self-contained EXE build | VERIFIED | `LiveChartsCore.SkiaSharpView.WPF 2.0.0-rc5.4` in csproj line 43; `IncludeNativeLibrariesForSelfExtract=true` in csproj line 16; `dotnet build` succeeds with 0 errors |
| 2 | After a storage scan completes, a chart appears in the Storage Metrics tab showing space broken down by file type | VERIFIED | `StorageService.CollectFileTypeMetricsAsync` (lines 68-159) enumerates files via CamlQuery with `FileLeafRef`/`File_x0020_Size`, groups by extension; `StorageViewModel.RunOperationAsync` calls it (line 218) and sets `FileTypeMetrics` (line 224); `StorageView.xaml` binds `lvc:PieChart Series="{Binding PieChartSeries}"` (line 170) and `lvc:CartesianChart Series="{Binding BarChartSeries}"` (line 190) |
| 3 | A toggle control switches the chart between pie/donut and bar chart representations without re-running the scan | VERIFIED | `IsDonutChart` property (line 41) with `OnIsDonutChartChanged` (line 298) calls `UpdateChartSeries`; RadioButtons in StorageView.xaml (lines 67-71) bind to `IsDonutChart`; PieChart visibility bound via `MultiDataTrigger` on `IsDonutChart=True` (lines 160-161); CartesianChart visibility on `IsDonutChart=False` (lines 180-181); toggle only regenerates series from in-memory `FileTypeMetrics`, no re-scan |
| 4 | The chart updates automatically whenever a new storage scan finishes, without requiring manual refresh | VERIFIED | `RunOperationAsync` (line 169) calls `CollectStorageAsync` then `CollectFileTypeMetricsAsync` (line 218), sets `FileTypeMetrics` (line 224) whose private setter calls `UpdateChartSeries()` (line 51); every scan execution path updates chart data automatically |

**Score:** 4/4 success criteria verified

### Required Artifacts

| Artifact | Expected | Status | Details |
|----------|----------|--------|---------|
| `SharepointToolbox/SharepointToolbox.csproj` | LiveChartsCore.SkiaSharpView.WPF PackageReference + IncludeNativeLibrariesForSelfExtract | VERIFIED | Line 43: PackageReference version 2.0.0-rc5.4; Line 16: IncludeNativeLibrariesForSelfExtract=true |
| `SharepointToolbox/Core/Models/FileTypeMetric.cs` | Record with Extension, TotalSizeBytes, FileCount, DisplayLabel | VERIFIED | 21-line record with computed DisplayLabel property |
| `SharepointToolbox/Services/IStorageService.cs` | CollectFileTypeMetricsAsync method signature | VERIFIED | Returns `Task<IReadOnlyList<FileTypeMetric>>` with ClientContext, IProgress, CancellationToken parameters |
| `SharepointToolbox/Services/StorageService.cs` | CollectFileTypeMetricsAsync implementation with CSOM CamlQuery | VERIFIED | Lines 68-159: paged CamlQuery with FileLeafRef/File_x0020_Size, extension grouping, sorted result |
| `SharepointToolbox/ViewModels/Tabs/StorageViewModel.cs` | Chart properties, toggle, UpdateChartSeries, auto-update from RunOperationAsync | VERIFIED | 393 lines: FileTypeMetrics, PieChartSeries, BarChartSeries, BarXAxes, BarYAxes, IsDonutChart, UpdateChartSeries with top-10+Other logic |
| `SharepointToolbox/Views/Tabs/StorageView.xaml` | PieChart, CartesianChart controls, RadioButton toggle, data bindings | VERIFIED | 199 lines: lvc:PieChart and lvc:CartesianChart with MultiDataTrigger visibility, RadioButtons for toggle |
| `SharepointToolbox.Tests/ViewModels/StorageViewModelChartTests.cs` | Unit tests for chart series, toggle, aggregation | VERIFIED | 7 tests covering series creation, bar structure, donut toggle, top-10+Other, tenant switch, empty data |
| `SharepointToolbox/Localization/Strings.resx` | Chart localization keys (stor.chart.*) | VERIFIED | 5 keys: stor.chart.title, stor.chart.donut, stor.chart.bar, stor.chart.toggle, stor.chart.nodata |
| `SharepointToolbox/Localization/Strings.fr.resx` | French chart localization keys | VERIFIED | All 5 keys present with French translations |

### Key Link Verification

| From | To | Via | Status | Details |
|------|----|-----|--------|---------|
| StorageViewModel.RunOperationAsync | StorageService.CollectFileTypeMetricsAsync | `_storageService.CollectFileTypeMetricsAsync(ctx, progress, ct)` | WIRED | Line 218 of ViewModel calls service; result assigned to FileTypeMetrics at line 224 |
| FileTypeMetrics setter | UpdateChartSeries | Private setter calls `UpdateChartSeries()` | WIRED | Line 51: setter triggers chart rebuild |
| IsDonutChart toggle | UpdateChartSeries | OnIsDonutChartChanged partial method | WIRED | Line 298-301: property change handler calls UpdateChartSeries |
| StorageView.xaml PieChart | PieChartSeries | `Series="{Binding PieChartSeries}"` | WIRED | Line 170 in XAML |
| StorageView.xaml CartesianChart | BarChartSeries | `Series="{Binding BarChartSeries}"` | WIRED | Line 190 in XAML |
| StorageView.xaml RadioButtons | IsDonutChart | `IsChecked="{Binding IsDonutChart}"` | WIRED | Lines 68-71 in XAML |
| IStorageService.CollectFileTypeMetricsAsync | FileTypeMetric | Return type `IReadOnlyList<FileTypeMetric>` | WIRED | Interface line 25 returns FileTypeMetric list |

### Requirements Coverage

| Requirement | Source Plan | Description | Status | Evidence |
|-------------|------------|-------------|--------|----------|
| VIZZ-01 | 09-01, 09-04 | Storage Metrics tab includes a graph showing space by file type | SATISFIED | LiveCharts2 integrated; PieChart and CartesianChart in StorageView.xaml; CollectFileTypeMetricsAsync provides data grouped by extension |
| VIZZ-02 | 09-02, 09-03, 09-04 | User can toggle between pie/donut chart and bar chart views | SATISFIED | IsDonutChart property with RadioButton toggle; MultiDataTrigger visibility switching between PieChart and CartesianChart |
| VIZZ-03 | 09-03, 09-04 | Graph updates when storage scan completes | SATISFIED | RunOperationAsync calls CollectFileTypeMetricsAsync then sets FileTypeMetrics, whose setter triggers UpdateChartSeries automatically |

No orphaned requirements found. All 3 VIZZ requirements are covered by plans and satisfied by implementation.

### Build and Test Verification

| Check | Status | Details |
|-------|--------|---------|
| `dotnet build SharepointToolbox.csproj` | PASSED | 0 errors, 6 NuGet compatibility warnings (SkiaSharp/OpenTK on net10.0 -- informational only) |
| `dotnet test --filter StorageViewModelChart` | PASSED | 7 passed, 0 failed, 0 skipped |

### Anti-Patterns Found

| File | Line | Pattern | Severity | Impact |
|------|------|---------|----------|--------|
| (none) | - | - | - | No anti-patterns detected |

No TODO/FIXME/HACK markers, no empty implementations, no stub returns, no console.log-only handlers found in any phase 9 artifacts.

### Human Verification Required

### 1. Chart renders visually after a real storage scan

**Test:** Connect to a SharePoint tenant, run a storage scan, observe the chart area below the DataGrid.
**Expected:** A donut chart appears showing file types (e.g., DOCX, PDF, XLSX) with legend on the right. Each slice is labeled and has a tooltip showing size and file count.
**Why human:** Chart rendering depends on SkiaSharp GPU/software rendering pipeline; cannot verify visual output programmatically.

### 2. Toggle between donut and bar chart

**Test:** After a scan completes and chart is visible, click the "Bar Chart" radio button in the Chart View group.
**Expected:** The donut chart disappears and a bar chart appears with file types on the X axis (rotated -45 degrees) and formatted byte sizes on the Y axis. Toggling back to "Donut Chart" restores the donut view.
**Why human:** Visual transition and layout correctness require human eye.

### 3. Self-contained EXE publish includes SkiaSharp native libraries

**Test:** Run `dotnet publish -c Release -r win-x64 --self-contained true /p:PublishSingleFile=true` and verify the resulting EXE launches and renders charts.
**Expected:** Single EXE runs without missing DLL errors; charts render in the published build.
**Why human:** Native library extraction and SkiaSharp initialization behavior varies by machine and can only be confirmed at runtime.

---

_Verified: 2026-04-07_
_Verifier: Claude (gsd-verifier)_