# ShiftsPage

## Overview

The ShiftsPage provides complete volunteer shift management for the Map module, enabling administrators to schedule canvassing shifts, manage volunteer signups, and coordinate field operations. Features include date/time scheduling, volunteer capacity tracking, public shift publishing, area (cut) assignment, signup management, and bulk email notifications to confirmed volunteers.

**Route:** `/app/map/shifts`
**Component:** `admin/src/pages/ShiftsPage.tsx` (757 lines)
**Auth Required:** Yes (SUPER_ADMIN, MAP_ADMIN roles)
**Layout:** AppLayout

## Screenshot

[Screenshot: Shifts page with 6 statistics cards at top (Total, Open, Full, Cancelled, Upcoming, Signups) showing counts with colored icons. Below stats are search bar + status filter dropdown. Main table shows columns: Title, Date, Time (start — end), Location, Area (cut name), Volunteers (progress bar showing X/Y), Status (colored tags), Public (checkmark icon if true), Actions (edit + delete). Rows clickable to open signups drawer. Page header has "Create Shift" button.]

## Features

### Core Features
- **Full CRUD operations** — Create, read, update, delete shifts
- **Advanced search** — 300ms debounced search by title or location
- **Status filtering** — Filter by OPEN, FULL, CANCELLED, COMPLETED
- **Statistics dashboard** — 6 cards showing total, open, full, cancelled, upcoming, total signups
- **Date/time scheduling** — Date picker + time pickers with 5-minute intervals
- **Volunteer capacity** — Max volunteers setting with progress bar visualization
- **Area assignment** — Assign shift to a canvass cut (area)
- **Public publishing** — Toggle to show shift on public `/shifts` page
- **Clickable rows** — Click any row to open signups drawer
- **Responsive table** — Columns hide on smaller screens (Time: md+, Location: lg+, Area: md+)

### Signup Management
- **Signups drawer** — Click shift row to view all confirmed volunteers
- **Manual signup** — Add volunteer by email + name (creates temp user if needed)
- **Signup source tracking** — PUBLIC (self-signup), ADMIN (added by admin)
- **Remove volunteers** — Delete button for each confirmed signup
- **Email all volunteers** — Bulk email button in drawer header
- **Signup stats** — Progress bar in table shows current/max volunteers
- **Auto-status management** — Shift status auto-updates to FULL when capacity reached

### Shift Status Workflow
1. **OPEN** — Shift created, accepting signups
2. **FULL** — Max volunteers reached (currentVolunteers >= maxVolunteers)
3. **CANCELLED** — Shift cancelled by admin
4. **COMPLETED** — Shift date passed (auto-marked by backend)

## User Workflow

### Viewing Shifts List

1. Navigate to `/app/map/shifts`
2. Page loads with statistics cards at top:
   - **Total:** All shifts count
   - **Open:** Shifts accepting signups (green)
   - **Full:** Shifts at capacity (orange)
   - **Cancelled:** Admin-cancelled shifts (red)
   - **Upcoming:** Future shifts (blue)
   - **Signups:** Total confirmed volunteers across all shifts
3. Table shows first 20 shifts (paginated)
4. View shift details:
   - Title (bold)
   - Date (YYYY-MM-DD)
   - Time (HH:mm — HH:mm format)
   - Location (e.g., "Campaign HQ, 123 Main St")
   - Area (cut name if assigned)
   - Volunteers (progress bar X/Y)
   - Status tag (color-coded)
   - Public checkmark icon (if published)
   - Actions (edit, delete)
5. Click any row to open signups drawer

### Creating a Shift

1. Click **"Create Shift"** button in page header
2. Modal opens (560px width) with vertical form
3. Fill **required fields**:
   - **Title** — Shift name (e.g., "Door Knocking", "Phone Banking")
   - **Date** — Date picker (calendar popup)
   - **Start Time** — Time picker (HH:mm, 5-minute intervals)
   - **End Time** — Time picker (HH:mm, 5-minute intervals)
   - **Max Volunteers** — Number input (min: 1)
4. Fill **optional fields**:
   - **Description** — Multi-line text (shift details + instructions)
   - **Location** — Text (e.g., "Campaign HQ, 123 Main St")
   - **Area (Cut)** — Dropdown (select canvass area, searchable)
   - **Public** — Switch toggle (default: false)
5. Click **"Create"** button
6. Success message: "Shift created"
7. Modal closes, table refreshes to page 1, stats refresh
8. New shift appears with status OPEN

### Editing a Shift

1. Locate shift in table
2. Click **Edit** icon button (EditOutlined) in Actions column
3. Drawer opens on right side (520px width) with vertical form
4. Modify any fields (same as create, plus **Status** dropdown):
   - Status options: OPEN, FULL, CANCELLED, COMPLETED
5. Click **"Save"** button in drawer header
6. Success message: "Shift updated"
7. Drawer closes, table refreshes, stats refresh

### Publishing a Shift to Public Page

1. Open shift in edit drawer
2. Toggle **"Public"** switch to ON
3. Click **"Save"**
4. Shift now visible on public `/shifts` page
5. Users can self-signup via public page
6. Signups source tracked as PUBLIC

### Assigning a Cut (Area) to Shift

1. Open shift in edit drawer
2. Click **"Area (Cut)"** dropdown
3. Search for cut by name
4. Select cut from list
5. Click **"Save"**
6. **Volunteer portal integration:**
   - Volunteers assigned to this shift now see it in `/volunteer/assignments` page
   - Shift with cut enables volunteer canvassing workflow
   - No cut = general shift (no canvass area)

### Viewing Shift Signups

1. Click any shift row in table
2. **Signups drawer** opens on right side (640px width)
3. Drawer header shows:
   - TeamOutlined icon + "Signups — {Shift Title}"
   - **"Email All"** button in header (disabled if no confirmed volunteers)
4. Info card at top displays shift summary:
   - Date
   - Time (start — end)
   - Volunteers (current / max)
5. Table shows confirmed volunteers:
   - Columns: Email, Name, Phone, Source (PUBLIC/ADMIN tag), Date, Remove button
   - Pagination: 20 per page (if > 20 signups)
   - Cancelled signups hidden (filtered out)
6. **Add volunteer section** at bottom:
   - Email input (required)
   - Name input (optional)
   - **"Add"** button (disabled if email empty)

### Manually Adding a Volunteer

1. Open signups drawer for any shift
2. Scroll to bottom "Add volunteer" section
3. Enter **email** (required)
4. Enter **name** (optional)
5. Click **"Add"** button
6. Backend logic:
   - If user exists: Create ShiftSignup record
   - If user doesn't exist: Create temp User + ShiftSignup
   - Signup source: ADMIN
   - Signup status: CONFIRMED
7. Success message: "Volunteer added"
8. Table refreshes with new volunteer
9. Email and name inputs clear
10. Main shifts table progress bar updates

**Temp user creation:**
- Role: TEMP
- Email: provided email
- Password: Readable format (e.g., "BlueEagle42")
- Expires: shift date + 1 day
- Used for public signups without account

### Removing a Volunteer

1. Open signups drawer
2. Locate volunteer in table
3. Click **Delete** icon button (red, last column)
4. Popconfirm: "Remove this volunteer?"
5. Click **"OK"**
6. Success message: "Volunteer removed"
7. Table refreshes (volunteer row disappears)
8. Main shifts table progress bar updates
9. Shift status may change from FULL to OPEN if capacity now available

### Emailing All Volunteers

1. Open signups drawer with confirmed volunteers
2. Click **"Email All"** button in drawer header
3. Backend sends email to all confirmed volunteers:
   - Email template: Shift details (title, date, time, location, description)
   - Subject: "Shift Reminder: {Shift Title}"
   - From: Site settings sender (e.g., "Changemaker Lite <noreply@cmlite.org>")
4. Success message: "Emailed N volunteer(s)" (or "N sent, M failed" if failures)
5. Email uses SMTP settings from Settings page

### Searching and Filtering

1. **Search bar** (top left):
   - Type title or location keywords
   - 300ms debounce (waits for typing pause)
   - Search resets pagination to page 1
2. **Status filter** dropdown (top right):
   - Select OPEN, FULL, CANCELLED, or COMPLETED
   - Filter resets pagination to page 1
   - Clear to show all shifts
3. Filters persist during pagination

### Deleting a Shift

1. Locate shift in table
2. Click **Delete** icon button (DeleteOutlined) in Actions column
3. Popconfirm: "Delete this shift?"
4. Click **"OK"** to confirm
5. Success message: "Shift deleted"
6. Table refreshes, stats refresh
7. **Cascade behavior:** All ShiftSignup records also deleted (Prisma cascade)

## Component Breakdown

### Ant Design Components Used

- **Table** — Main shifts list + signups table in drawer
- **Button** — Create (primary), edit, delete, add volunteer, email all
- **Input** — Search bar, email input, name input (signups drawer)
- **Select** — Status filter dropdown, area (cut) dropdown
- **Tag** — Status tags (color-coded), signup source tags
- **Space** — Action button grouping, drawer header
- **Card** — Statistics cards (6 cards), shift summary card in signups drawer
- **Statistic** — Numeric displays with icons + prefixes
- **Progress** — Volunteer capacity progress bar (in Volunteers column)
- **Modal** — Create shift form
- **Drawer** — Edit shift (520px), signups drawer (640px)
- **Form** — Create/edit shift forms
- **Form.Item** — Field wrappers with labels + rules
- **Input.TextArea** — Description field (multi-line)
- **DatePicker** — Date selection with calendar popup
- **TimePicker** — Time selection with hour/minute dropdowns (5-minute steps)
- **InputNumber** — Max volunteers numeric input (min: 1)
- **Switch** — Public toggle (valuePropName="checked")
- **Row, Col** — Responsive grid for stats cards, date/time fields
- **Popconfirm** — Delete confirmation (shift + volunteer removal)
- **Typography.Text** — Labels, descriptions

### Table Columns (Main Shifts Table)

```typescript
const columns: ColumnsType<Shift> = [
  {
    title: 'Title',
    dataIndex: 'title',
    render: (title) => <span style={{ fontWeight: 500 }}>{title}</span>,
  },
  {
    title: 'Date',
    dataIndex: 'date',
    render: (date) => dayjs(date).format('YYYY-MM-DD'),
  },
  {
    title: 'Time',
    render: (_, record) => `${record.startTime} — ${record.endTime}`,
    responsive: ['md'],
  },
  {
    title: 'Location',
    dataIndex: 'location',
    render: (loc) => loc || '--',
    responsive: ['lg'],
  },
  {
    title: 'Area',
    render: (_, record) => record.cut?.name || '--',
    responsive: ['md'],
  },
  {
    title: 'Volunteers',
    width: 140,
    render: (_, record) => {
      const confirmed = record._count?.signups ?? record.currentVolunteers;
      const pct = record.maxVolunteers > 0 ? Math.round((confirmed / record.maxVolunteers) * 100) : 0;
      return (
        <Progress
          percent={pct}
          size="small"
          status={pct >= 100 ? 'exception' : 'active'}
          format={() => `${confirmed}/${record.maxVolunteers}`}
        />
      );
    },
  },
  {
    title: 'Status',
    dataIndex: 'status',
    width: 100,
    render: (status) => <Tag color={SHIFT_STATUS_COLORS[status]}>{SHIFT_STATUS_LABELS[status]}</Tag>,
  },
  {
    title: 'Public',
    dataIndex: 'isPublic',
    width: 70,
    render: (isPublic) => isPublic ? <CheckCircleOutlined style={{ color: '#52c41a' }} /> : null,
  },
  {
    title: 'Actions',
    width: 120,
    render: (_, record) => (
      <Space>
        <Button type="link" size="small" icon={<EditOutlined />} onClick={() => openEdit(record)} />
        <Popconfirm title="Delete this shift?" onConfirm={() => handleDelete(record.id)}>
          <Button type="link" size="small" danger icon={<DeleteOutlined />} />
        </Popconfirm>
      </Space>
    ),
  },
];
```

**Key patterns:**
- `_count.signups` aggregation from Prisma (confirmed volunteers count)
- `responsive` array hides columns on smaller screens
- Progress bar shows visual capacity indicator (turns red when full)
- `onRow` prop makes entire row clickable to open signups drawer

### Signups Table Columns

```typescript
const signupColumns: ColumnsType<ShiftSignup> = [
  {
    title: 'Email',
    dataIndex: 'userEmail',
  },
  {
    title: 'Name',
    dataIndex: 'userName',
    render: (name) => name || '--',
  },
  {
    title: 'Phone',
    render: (_, record) => record.userPhone || record.user?.phone || '--',
    responsive: ['md'],
  },
  {
    title: 'Source',
    dataIndex: 'signupSource',
    width: 100,
    render: (source) => <Tag color={SIGNUP_SOURCE_COLORS[source]}>{source}</Tag>,
  },
  {
    title: 'Date',
    dataIndex: 'signupDate',
    render: (date) => dayjs(date).format('YYYY-MM-DD'),
    responsive: ['lg'],
  },
  {
    title: '',
    width: 60,
    render: (_, record) =>
      record.status === 'CONFIRMED' ? (
        <Popconfirm title="Remove this volunteer?" onConfirm={() => handleRemoveSignup(record.id)}>
          <Button type="link" size="small" danger icon={<DeleteOutlined />} />
        </Popconfirm>
      ) : (
        <Tag color="red">Cancelled</Tag>
      ),
  },
];
```

**Filter:** Table only shows CONFIRMED signups:
```typescript
<Table dataSource={signups.filter((s) => s.status === 'CONFIRMED')} />
```

### Status Colors

```typescript
export const SHIFT_STATUS_COLORS: Record<ShiftStatus, string> = {
  OPEN: 'green',
  FULL: 'orange',
  CANCELLED: 'red',
  COMPLETED: 'default',
};

export const SHIFT_STATUS_LABELS: Record<ShiftStatus, string> = {
  OPEN: 'Open',
  FULL: 'Full',
  CANCELLED: 'Cancelled',
  COMPLETED: 'Completed',
};
```

### Signup Source Colors

```typescript
export const SIGNUP_SOURCE_COLORS = {
  PUBLIC: 'blue',    // User signed up via public /shifts page
  ADMIN: 'purple',   // Admin added manually
};
```

### Form Fields

```typescript
const shiftFormFields = (isEdit = false) => (
  <>
    <Form.Item name="title" label="Title" rules={[{ required: true }]}>
      <Input placeholder="e.g. Door Knocking, Phone Banking" />
    </Form.Item>
    <Form.Item name="description" label="Description">
      <Input.TextArea rows={3} placeholder="Shift details and instructions" />
    </Form.Item>
    <Row gutter={12}>
      <Col xs={24} sm={8}>
        <Form.Item name="date" label="Date" rules={[{ required: true }]}>
          <DatePicker style={{ width: '100%' }} />
        </Form.Item>
      </Col>
      <Col xs={12} sm={8}>
        <Form.Item name="startTime" label="Start Time" rules={[{ required: true }]}>
          <TimePicker format="HH:mm" style={{ width: '100%' }} minuteStep={5} />
        </Form.Item>
      </Col>
      <Col xs={12} sm={8}>
        <Form.Item name="endTime" label="End Time" rules={[{ required: true }]}>
          <TimePicker format="HH:mm" style={{ width: '100%' }} minuteStep={5} />
        </Form.Item>
      </Col>
    </Row>
    <Form.Item name="location" label="Location">
      <Input placeholder="e.g. Campaign HQ, 123 Main St" />
    </Form.Item>
    <Form.Item name="cutId" label="Area (Cut)">
      <Select
        options={cutOptions}
        placeholder="Assign a canvass area..."
        allowClear
        showSearch
        optionFilterProp="label"
      />
    </Form.Item>
    <Row gutter={12}>
      <Col xs={12} sm={8}>
        <Form.Item name="maxVolunteers" label="Max Volunteers" rules={[{ required: true }]}>
          <InputNumber min={1} style={{ width: '100%' }} />
        </Form.Item>
      </Col>
      <Col xs={12} sm={8}>
        <Form.Item name="isPublic" label="Public" valuePropName="checked">
          <Switch />
        </Form.Item>
      </Col>
      {isEdit && (
        <Col xs={12} sm={8}>
          <Form.Item name="status" label="Status">
            <Select options={statusOptions} />
          </Form.Item>
        </Col>
      )}
    </Row>
  </>
);
```

**Reusable pattern:** Same form fields for create + edit, with conditional Status field in edit mode.

## State Management

### Zustand Stores Used

None — Shifts fetched from API on each interaction. No global state required.

### Local State

```typescript
const [shifts, setShifts] = useState<Shift[]>([]);
const [pagination, setPagination] = useState({ page: 1, limit: 20, total: 0, totalPages: 0 });
const [loading, setLoading] = useState(false);
const [search, setSearch] = useState('');
const [debouncedSearch, setDebouncedSearch] = useState('');
const searchTimerRef = useRef<ReturnType<typeof setTimeout>>(undefined);
const [statusFilter, setStatusFilter] = useState<ShiftStatus | undefined>();
const [stats, setStats] = useState<ShiftStats | null>(null);

// Create modal
const [createModalOpen, setCreateModalOpen] = useState(false);
const [createForm] = Form.useForm();

// Edit drawer
const [editDrawerOpen, setEditDrawerOpen] = useState(false);
const [editingShift, setEditingShift] = useState<Shift | null>(null);
const [editForm] = Form.useForm();

// Signups drawer
const [signupsDrawerOpen, setSignupsDrawerOpen] = useState(false);
const [signupsShift, setSignupsShift] = useState<Shift | null>(null);
const [signups, setSignups] = useState<ShiftSignup[]>([]);
const [signupsLoading, setSignupsLoading] = useState(false);
const [addEmail, setAddEmail] = useState('');
const [addName, setAddName] = useState('');

// Cuts for area dropdown
const [cuts, setCuts] = useState<Cut[]>([]);
```

### Debounced Search

```typescript
const handleSearchChange = (value: string) => {
  setSearch(value);               // Update input immediately
  clearTimeout(searchTimerRef.current);
  searchTimerRef.current = setTimeout(() => setDebouncedSearch(value), 300);
};

useEffect(() => {
  return () => clearTimeout(searchTimerRef.current);  // Cleanup on unmount
}, []);

useEffect(() => {
  fetchShifts({ page: 1 });
  fetchStats();
  fetchCuts();
}, [debouncedSearch, statusFilter]);  // Re-fetch when search or filter changes
```

**Why 300ms?** Same pattern as other pages — prevents API spam while typing.

## API Integration

### Endpoints Used

| Method | Endpoint | Purpose |
|--------|----------|---------|
| GET | `/api/map/shifts` | List shifts (paginated, filtered) |
| GET | `/api/map/shifts/stats` | Fetch statistics (counts by status) |
| GET | `/api/map/shifts/:id` | Fetch single shift with signups |
| POST | `/api/map/shifts` | Create shift |
| PUT | `/api/map/shifts/:id` | Update shift |
| DELETE | `/api/map/shifts/:id` | Delete shift (cascade signups) |
| POST | `/api/map/shifts/:id/signups` | Add volunteer manually (admin) |
| DELETE | `/api/map/shifts/:id/signups/:signupId` | Remove volunteer |
| POST | `/api/map/shifts/:id/email-details` | Email all confirmed volunteers |

### List Shifts

**Request:**

```typescript
const { data } = await api.get<ShiftsListResponse>('/map/shifts', {
  params: {
    page: 1,
    limit: 20,
    search: 'door knocking',    // Optional: search title/location
    status: 'OPEN',             // Optional: filter by status
  },
});
```

**Response:**

```json
{
  "shifts": [
    {
      "id": "shift-123",
      "title": "Door Knocking — Downtown",
      "description": "Focus on high-density residential areas. Bring campaign materials.",
      "date": "2026-02-15",
      "startTime": "10:00",
      "endTime": "14:00",
      "location": "Campaign HQ, 123 Main St",
      "maxVolunteers": 15,
      "currentVolunteers": 8,
      "status": "OPEN",
      "isPublic": true,
      "cutId": "cut-456",
      "cut": {
        "id": "cut-456",
        "name": "Downtown Core"
      },
      "createdAt": "2026-01-10T09:00:00.000Z",
      "updatedAt": "2026-01-15T14:30:00.000Z",
      "_count": {
        "signups": 8
      }
    }
  ],
  "pagination": {
    "page": 1,
    "limit": 20,
    "total": 47,
    "totalPages": 3
  }
}
```

**Key fields:**
- `cutId` — Foreign key to Cut (polygon area)
- `cut` — Nested cut object (if assigned)
- `currentVolunteers` — Confirmed signups count
- `_count.signups` — Prisma aggregation (confirmed signups count)
- `startTime`, `endTime` — 24-hour format strings (HH:mm)

### Fetch Shift Statistics

**Request:**

```typescript
const { data } = await api.get<ShiftStats>('/map/shifts/stats');
```

**Response:**

```json
{
  "total": 47,
  "open": 23,
  "full": 8,
  "cancelled": 2,
  "completed": 14,
  "upcoming": 31,
  "totalSignups": 287
}
```

**Upcoming calculation:** Future shifts (date >= today)

### Create Shift

**Request:**

```typescript
const payload = {
  title: "Phone Banking",
  description: "Call voters to discuss campaign issues",
  date: "2026-02-20",
  startTime: "18:00",
  endTime: "21:00",
  location: "Campaign HQ",
  maxVolunteers: 10,
  isPublic: true,
  cutId: "cut-789",  // Optional
};

await api.post('/map/shifts', payload);
```

**Response:**

```json
{
  "id": "shift-999",
  "title": "Phone Banking",
  "status": "OPEN",
  "currentVolunteers": 0,
  "createdAt": "2026-02-11T10:00:00.000Z",
  // ... all other fields
}
```

**Default values:**
- `status` — OPEN
- `currentVolunteers` — 0
- `isPublic` — false (if not specified)

### Update Shift

**Request:**

```typescript
const payload = {
  status: "CANCELLED",
  description: "Cancelled due to weather",
};

await api.put(`/map/shifts/${shiftId}`, payload);
```

**Partial updates:** Only send changed fields.

### Add Volunteer (Manual Signup)

**Request:**

```typescript
await api.post(`/map/shifts/${shiftId}/signups`, {
  userEmail: 'volunteer@example.com',
  userName: 'Jane Doe',  // Optional
});
```

**Response:**

```json
{
  "id": "signup-456",
  "shiftId": "shift-123",
  "userId": "user-789",  // Existing or newly created temp user
  "userEmail": "volunteer@example.com",
  "userName": "Jane Doe",
  "signupSource": "ADMIN",
  "status": "CONFIRMED",
  "signupDate": "2026-02-11T10:30:00.000Z"
}
```

**Temp user creation logic:**
- If `volunteer@example.com` exists → link to existing user
- If doesn't exist → create temp user:
  ```json
  {
    "email": "volunteer@example.com",
    "name": "Jane Doe",
    "role": "TEMP",
    "password": "BlueEagle42",  // Readable password
    "tempUserExpiresAt": "2026-02-21T00:00:00.000Z"  // shift date + 1 day
  }
  ```

### Email All Volunteers

**Request:**

```typescript
const { data } = await api.post<{ sent: number; failed: number }>(
  `/map/shifts/${shiftId}/email-details`
);
```

**Response:**

```json
{
  "sent": 8,
  "failed": 0
}
```

**Email template:**

```
Subject: Shift Reminder: {Shift Title}

Hi {Volunteer Name},

This is a reminder about your upcoming volunteer shift:

Title: {Shift Title}
Date: {Date}
Time: {Start Time} — {End Time}
Location: {Location}

Description:
{Shift Description}

Thank you for volunteering!

Changemaker Lite
```

**SMTP:** Uses site settings (Settings page → Email tab)

## Code Examples

### Clickable Table Rows

```typescript
<Table
  columns={columns}
  dataSource={shifts}
  rowKey="id"
  onRow={(record) => ({
    onClick: () => openSignups(record),  // Click row → open signups drawer
    style: { cursor: 'pointer' },        // Show pointer cursor on hover
  })}
/>
```

**Pattern:** Entire row clickable except action buttons (edit/delete use `stopPropagation`).

### Progress Bar for Volunteer Capacity

```typescript
{
  title: 'Volunteers',
  width: 140,
  render: (_, record) => {
    const confirmed = record._count?.signups ?? record.currentVolunteers;
    const pct = record.maxVolunteers > 0 ? Math.round((confirmed / record.maxVolunteers) * 100) : 0;
    return (
      <Progress
        percent={pct}
        size="small"
        status={pct >= 100 ? 'exception' : 'active'}
        format={() => `${confirmed}/${record.maxVolunteers}`}
      />
    );
  },
}
```

**Visual feedback:**
- Green progress bar: < 100%
- Red progress bar: = 100% (full, status "exception")
- Format shows: "8/15" (8 confirmed out of 15 max)

### Date/Time Payload Formatting

```typescript
const handleCreate = async (values: Record<string, unknown>) => {
  const payload = {
    title: values.title,
    date: dayjs(values.date as string).format('YYYY-MM-DD'),      // DatePicker → string
    startTime: dayjs(values.startTime as string).format('HH:mm'), // TimePicker → string
    endTime: dayjs(values.endTime as string).format('HH:mm'),     // TimePicker → string
    maxVolunteers: values.maxVolunteers,
    // ... other fields
  };
  await api.post('/map/shifts', payload);
};
```

**Why format?** DatePicker and TimePicker return Dayjs objects. Backend expects ISO date string + HH:mm time strings.

### Edit Form Pre-Fill

```typescript
const openEdit = (shift: Shift) => {
  setEditingShift(shift);
  editForm.setFieldsValue({
    title: shift.title,
    description: shift.description,
    date: dayjs(shift.date),                    // String → Dayjs object
    startTime: dayjs(shift.startTime, 'HH:mm'), // HH:mm string → Dayjs object with format
    endTime: dayjs(shift.endTime, 'HH:mm'),
    location: shift.location,
    maxVolunteers: shift.maxVolunteers,
    isPublic: shift.isPublic,
    status: shift.status,
    cutId: shift.cutId,
  });
  setEditDrawerOpen(true);
};
```

**Why `dayjs(shift.startTime, 'HH:mm')`?** TimePicker needs Dayjs object with specific format. Backend stores as "10:00" string, convert to Dayjs with HH:mm format.

### Conditional Status Field

```typescript
const shiftFormFields = (isEdit = false) => (
  <>
    {/* ... other fields */}
    <Row gutter={12}>
      {/* ... maxVolunteers, isPublic */}
      {isEdit && (
        <Col xs={12} sm={8}>
          <Form.Item name="status" label="Status">
            <Select options={statusOptions} />
          </Form.Item>
        </Col>
      )}
    </Row>
  </>
);
```

**Why conditional?** Status dropdown only shown in edit mode. Create form defaults to OPEN (set by backend).

## Performance Considerations

### Debounced Search

Same 300ms debounce pattern as other pages:
- Prevents API spam while typing
- Only fires after user pauses
- Cleanup on unmount

### Responsive Column Hiding

```typescript
{ title: 'Time', responsive: ['md'] }       // Hide on < 768px
{ title: 'Location', responsive: ['lg'] }   // Hide on < 992px
{ title: 'Area', responsive: ['md'] }       // Hide on < 768px
```

Mobile users see: Title, Date, Volunteers, Status, Public, Actions

### useCallback Optimization

```typescript
const fetchShifts = useCallback(async (params?: ShiftsListParams) => {
  // ... fetch logic
}, [pagination.page, pagination.limit, debouncedSearch, statusFilter]);

const fetchStats = useCallback(async () => {
  // ... fetch logic
}, []);

const fetchCuts = useCallback(async () => {
  // ... fetch logic
}, []);
```

Memoized functions prevent unnecessary re-renders.

## Responsive Design

### Mobile (< 576px)

- **Stats cards:** 2 columns (xs={12})
- **Search bar:** Full width
- **Status filter:** Full width below search
- **Table:** Minimal columns (Title, Date, Volunteers, Status, Actions)
- **Signups drawer:** Full screen overlay (width: 100%)

### Tablet (576px - 992px)

- **Stats cards:** 3-4 columns (sm={4} or sm={6})
- **Search bar:** Half width (sm={12})
- **Status filter:** Quarter width (sm={6})
- **Table:** Time + Area columns visible

### Desktop (≥ 992px)

- **Stats cards:** 6 columns (md={4})
- **Filters:** Compact (search 1/3, filter 1/6)
- **Table:** All columns visible (Location, Date)
- **Signups drawer:** 640px overlay (right side)

## Accessibility

- **Keyboard navigation:** All buttons, inputs, selects focusable via Tab
- **ARIA labels:** Icon buttons have `title` attribute
- **Form validation:** Required fields marked, inline error messages
- **Color contrast:** Status tags use Ant Design defaults (WCAG AA compliant)
- **Screen reader support:** Form labels properly associated
- **Focus management:** Modals/drawers auto-focus first input on open

## Troubleshooting

### Shift Status Not Auto-Updating to FULL

**Problem:** Shift reaches max volunteers (8/8), but status stays OPEN instead of changing to FULL.

**Diagnosis:**

Backend auto-status logic should run on every signup:
```typescript
if (currentVolunteers >= maxVolunteers) {
  await prisma.shift.update({
    where: { id: shiftId },
    data: { status: 'FULL' },
  });
}
```

**Common Issues:**

1. **Backend logic not running:**
   - Check API logs: `docker compose logs api | grep "shift status"`
   - Verify signup endpoint includes auto-status update

2. **Race condition:**
   - Multiple signups at same time (public + admin)
   - Solution: Use Prisma transaction for atomic updates

3. **Status manually set:**
   - Admin changed status to OPEN in edit drawer
   - Solution: Status field warning: "Auto-updates to FULL when capacity reached"

**Solution:**

Refresh page to see latest status. Backend should auto-update on next signup/removal.

---

### Email All Volunteers Fails

**Problem:** Click "Email All" button → Error: "Failed to email volunteers"

**Diagnosis:**

Check SMTP configuration:
1. Navigate to Settings → Email tab
2. Verify active provider: Production (not MailHog)
3. Click "Test Connection" → Should show success

**Common Issues:**

1. **MailHog active (dev mode):**
   - Switch to Production provider
   - Save settings

2. **SMTP credentials invalid:**
   - Test connection fails
   - Update credentials
   - Re-test before emailing

3. **No confirmed volunteers:**
   - Email All button disabled if 0 confirmed
   - Check signups drawer table (only CONFIRMED shown)

**Solution:**

1. Fix SMTP settings
2. Test connection
3. Retry Email All

---

### Volunteer Not Appearing in Signups

**Problem:** Add volunteer by email → Success message → Volunteer not in signups table

**Diagnosis:**

Check signups drawer filter:
```typescript
<Table dataSource={signups.filter((s) => s.status === 'CONFIRMED')} />
```

Cancelled signups hidden.

**Common Issues:**

1. **Volunteer added but immediately cancelled:**
   - Check backend logs for cancellation endpoint calls
   - Verify signup status in database

2. **Wrong shift:**
   - Added to different shift
   - Verify shift ID in URL when opening drawer

3. **Duplicate email:**
   - Volunteer already signed up
   - Backend returns 400: "User already signed up for this shift"
   - Check error message

**Solution:**

Refresh drawer: Close and re-open signups drawer to fetch latest data.

---

### Area (Cut) Dropdown Empty

**Problem:** Create/edit shift → Area dropdown shows no options

**Diagnosis:**

Check cuts API endpoint:
```bash
curl http://localhost:4000/api/map/cuts
```

**Common Issues:**

1. **No cuts created yet:**
   - Navigate to `/app/map/cuts`
   - Create at least one cut (polygon boundary)
   - Return to shifts page

2. **Cuts API failing:**
   - Check API logs: `docker compose logs api | grep "cuts"`
   - Verify database connection

3. **Cuts fetch not called:**
   - Check browser console for errors
   - Verify `fetchCuts()` called in `useEffect`

**Solution:**

Create at least one cut in CutsPage before assigning to shifts.

---

### Public Shift Not Showing on Public Page

**Problem:** Set isPublic to true, save shift → Public `/shifts` page doesn't show it

**Diagnosis:**

Check shift criteria for public page:
- Status: OPEN or FULL (not CANCELLED or COMPLETED)
- isPublic: true
- Date: Future (not past)

**Common Issues:**

1. **Shift date in past:**
   - Past shifts hidden from public page
   - Edit shift, update date to future

2. **Status CANCELLED:**
   - Cancelled shifts hidden from public page
   - Change status to OPEN

3. **Browser cache:**
   - Hard refresh public page (Ctrl+Shift+R)

**Solution:**

Verify all 3 criteria met: OPEN/FULL status, isPublic true, future date.

## Related Documentation

- [Shifts Module (Backend)](/v2/backend/modules/shifts.md) — API implementation, schemas, service functions
- [Shift Signups](/v2/backend/modules/shifts.md#signups) — Signup creation, temp users, email logic
- [Cuts Module](/v2/backend/modules/cuts.md) — Polygon boundaries for shift areas
- [Public Shifts Page](/v2/frontend/pages/public/shifts-page.md) — Public shift signup page
- [Volunteer Shifts Page](/v2/frontend/pages/volunteer/volunteer-shifts-page.md) — Volunteer portal assignments
- [Shifts API Reference](/v2/api-reference/shifts.md) — Complete endpoint documentation
- [Map Feature Guide](/v2/features/map/shifts.md) — End-to-end shift workflow
- [User Guide: Volunteer Coordination](/v2/user-guides/map-organizer-guide.md) — Shift scheduling best practices
- [Troubleshooting: Shift Issues](/v2/troubleshooting/shift-issues.md) — Shift debugging