# Branch Filter for Reports Dashboard - Implementation Summary

## Overview
Added a branch filtering dropdown to the Reports & Statements Dashboard that allows **admin users only** to filter reports by specific branches or view all branches combined.

## ✓ Bug Fixed!
**Issue Found**: The `simple_reports_service.py` was trying to convert UUID branch IDs to integers, which failed silently and prevented filtering.

**Solution**: Removed the unnecessary int conversion. Branch filtering now works correctly!

See `BRANCH_FILTER_FIX_COMPLETE.md` for technical details.

## Changes Made

### 1. Backend Changes (`reports/views.py`)

#### Updated `reports_dashboard` function:
- Added branch filter handling for admin users via GET parameter `branch_filter`
- When admin selects a branch, it's stored in the session
- When admin selects "All Branches", the session branch filter is cleared (set to None)
- Non-admin users continue to see only their assigned branch data (no changes to existing behavior)
- Added `all_branches` and `is_admin` to the template context

```python
# Handle branch filter for admins
if request.user.role == 'admin' and request.method == 'GET':
    branch_filter = request.GET.get('branch_filter')
    if branch_filter:
        if branch_filter == 'all':
            request.session['selected_branch_id'] = None
        else:
            request.session['selected_branch_id'] = branch_filter
```

### 2. Frontend Changes (`templates/reports/standalone_dashboard.html`)

#### Added Branch Filter Dropdown:
- Positioned in the header next to the "Last Updated" timestamp
- Only visible to admin users (`{% if is_admin %}`)
- Styled to match the existing dashboard design
- Shows "All Branches" option and lists all active branches
- Automatically selects the currently filtered branch

#### Added JavaScript Function:
- `filterByBranch(branchId)` function handles dropdown changes
- Reloads the page with the selected branch filter as a URL parameter
- Maintains clean URL structure for bookmarking/sharing

## User Experience

### For Admin Users:
1. See a dropdown labeled "Filter by Branch" in the dashboard header
2. Can select:
   - **All Branches** - View aggregated data from all branches
   - **Specific Branch** - View data for a single branch only
3. Selection persists across page refreshes (stored in session)
4. Dashboard data updates immediately when selection changes

### For Non-Admin Users:
- No visual changes
- Continue to see only their assigned branch data
- No access to the branch filter dropdown

## Technical Details

- **Session Storage**: Branch selection is stored in `request.session['selected_branch_id']`
- **URL Parameter**: Uses `?branch_filter=<branch_id>` or `?branch_filter=all`
- **Filtering Logic**: Existing `simple_reports_service.generate_dashboard_data()` already supports branch filtering via the `branch_id` parameter
- **Security**: Only users with `role == 'admin'` can access the filter

## Testing Recommendations

1. **Admin User Testing**:
   - Login as admin
   - Verify dropdown appears in dashboard header
   - Select different branches and verify data changes
   - Select "All Branches" and verify aggregated data
   - Refresh page and verify selection persists

2. **Non-Admin User Testing**:
   - Login as loan officer, secretary, or other role
   - Verify dropdown does NOT appear
   - Verify data shows only their assigned branch

3. **Data Validation**:
   - Compare branch-specific data with database records
   - Verify "All Branches" shows sum of all branch data
   - Check that metrics update correctly (portfolio value, outstanding, etc.)

## Files Modified

1. `reports/views.py` - Added branch filter logic and context variables
2. `templates/reports/standalone_dashboard.html` - Added dropdown UI and JavaScript

## Deployment Notes

- No database migrations required
- No new dependencies
- Changes are backward compatible
- Existing branch filtering for non-admin users remains unchanged
