# Phase 4: Bulk Operations and Provisioning - Context

**Gathered:** 2026-04-02
**Status:** Ready for planning

<domain>
## Phase Boundary

Users can execute bulk write operations (member additions, site creation, file transfer) with per-item error reporting and cancellation, capture site structures as reusable templates, apply templates to create new sites, and provision folder structures from CSV — all without silent partial failures.

Requirements: BULK-01, BULK-02, BULK-03, BULK-04, BULK-05, TMPL-01, TMPL-02, TMPL-03, TMPL-04, FOLD-01, FOLD-02

</domain>

<decisions>
## Implementation Decisions

### Bulk operation failure behavior
- Continue all items on error, report summary at end — never stop on first failure
- Errors are logged live in the log panel (red) AND user can export a CSV of failed items after completion
- Failed-items CSV includes: original row data, error message, timestamp — user can fix and re-import
- "Retry Failed" button appears after completion with partial failures, re-runs only failed items
- User can also manually re-import the corrected failed-items CSV
- Always show a confirmation summary dialog before any bulk write operation starts (e.g., "12 members will be added to 3 groups — Proceed?")

### File transfer semantics
- User chooses Copy or Move (radio button or dropdown) — both options always visible
- Move deletes source files only after successful transfer to destination
- Conflict policy is user-selectable per operation: Skip / Overwrite / Rename (append suffix)
- One conflict policy applies to all files in the batch
- Source and destination selection: site picker + library/folder tree browser on both sides (reuse SitePickerDialog pattern from Phase 2)
- Metadata preservation: best effort — try to set original author and dates via CSOM; if SharePoint rejects (common cross-tenant), log a warning and continue

### Template capture scope
- User selects what to capture via checkboxes (not a fixed capture)
- Available capture options (core set): Libraries, Folders, Permission groups, Site logo, Site settings (title, description, regional settings)
- No custom columns, content types, or navigation links in v1 — keep templates lightweight
- Template remembers source site type (Communication or Teams) and creates the same type on apply — no user choice of target type
- Templates persisted as JSON locally (TMPL-03)
- Dedicated Templates tab in the main UI — templates are a first-class feature area with: list of saved templates, capture button, apply button, rename/delete

### CSV format and pre-flight validation
- Bundled example CSV templates shipped with the app for each bulk operation (member addition, site creation, folder structure) — pre-filled with sample data as reference
- After CSV import: full validation pass + DataGrid preview showing all rows with valid/invalid indicators
- User reviews the preview grid, then clicks "Execute" to proceed
- Invalid rows highlighted — user can fix and re-import before executing
- CSV encoding: UTF-8 with BOM detection (accept with or without BOM, matches Excel output and app's own CSV exports)

### Tab organization
- Each operation gets its own top-level tab: Transfer, Bulk Members, Bulk Sites, Folder Structure, Templates
- Matches the existing PowerShell tool's tab structure
- Each tab follows FeatureViewModelBase pattern (AsyncRelayCommand + IProgress + CancellationToken)

### Claude's Discretion
- Exact CSV column names and schemas for each bulk operation type
- Tree browser component implementation details for file transfer source/destination
- Template JSON schema structure
- PnP Provisioning Engine usage details for template apply
- Confirmation dialog layout and wording
- DataGrid preview grid column configuration
- Retry mechanism implementation details

</decisions>

<code_context>
## Existing Code Insights

### Reusable Assets
- `FeatureViewModelBase`: Base for all feature ViewModels — AsyncRelayCommand, IProgress, CancellationToken, TenantSwitchedMessage handling
- `SitePickerDialog`: Site selection dialog from Phase 2 — reuse for source/destination pickers in file transfer
- `OperationProgress(int Current, int Total, string Message)`: Shared progress model used by all services
- `ExecuteQueryRetryHelper`: Auto-retry on 429/503 with exponential backoff — all CSOM calls use this
- `SharePointPaginationHelper`: Async enumerable for paginated list queries
- `SessionManager`: Singleton holding all ClientContext instances — GetOrCreateContextAsync(TenantProfile, CancellationToken)
- `CsvExportService` pattern: UTF-8 BOM, RFC 4180 quoting — follow for bulk operation error report exports

### Established Patterns
- Service interfaces registered as transient in DI (App.xaml.cs)
- ViewModels use `[ObservableProperty]` attributes + `ObservableCollection<T>` for results
- Export commands use SaveFileDialog wired via Func<> factory from View code-behind
- Per-tab progress bar + cancel button (Visibility bound to IsRunning)
- Results accumulated in List<T> on background thread, assigned as new ObservableCollection on UI thread

### Integration Points
- `App.xaml.cs RegisterServices()`: Add new services, ViewModels, Views
- `MainWindow.xaml`: Add new TabItems for Transfer, Bulk Members, Bulk Sites, Folder Structure, Templates
- `MainWindow.xaml.cs`: Wire View content from DI at runtime (same pattern as Permissions, Storage, Search tabs)
- `Core/Models/`: New models for bulk operation items, template schema, CSV row types
- `Services/`: New service interfaces and implementations for each bulk operation
- `Strings.resx` / `Strings.fr.resx`: Localization keys for all Phase 4 UI strings

</code_context>

<specifics>
## Specific Ideas

- Tab structure should match the existing PowerShell tool (9 tabs: Perms, Storage, Templates, Search, Dupes, Transfer, Bulk, Struct, Versions)
- Bundled CSV examples should have realistic sample data (not just headers) so MSP admins can understand the format immediately
- Confirmation dialog before writes is non-negotiable — these are destructive operations on client tenants
- Failed-items CSV should be directly re-importable without editing (same format as input CSV, with an extra error column appended)

</specifics>

<deferred>
## Deferred Ideas

None — discussion stayed within phase scope

</deferred>

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*Phase: 04-bulk-operations-and-provisioning*
*Context gathered: 2026-04-02*