# Assignment System Update Documentation

## Overview

This document details the changes made to the KSO Chandigarh Admin Panel assignment system to align the JavaScript frontend, PHP backend services, and the underlying database schema. The updates ensure proper functionality, consistent data handling, and full feature support according to the database schema.

## Database Schema

The assignment system uses the `admin_assignments` table with the following structure:

```sql
CREATE TABLE `admin_assignments` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `member_id` int(11) NOT NULL,
  `assigned_to` int(11) NOT NULL,
  `assigned_by` int(11) NOT NULL,
  `assignment_type` enum('review','approval','verification','follow_up') NOT NULL DEFAULT 'review',
  `priority` enum('low','normal','high','urgent') NOT NULL DEFAULT 'normal',
  `due_date` datetime DEFAULT NULL,
  `status` enum('active','completed','cancelled','overdue') NOT NULL DEFAULT 'active',
  `notes` text DEFAULT NULL,
  `completed_at` datetime DEFAULT NULL,
  `completed_by` int(11) DEFAULT NULL,
  `created_at` datetime DEFAULT current_timestamp(),
  `updated_at` datetime DEFAULT current_timestamp() ON UPDATE current_timestamp(),
  PRIMARY KEY (`id`),
  KEY `idx_member_id` (`member_id`),
  KEY `idx_assigned_to` (`assigned_to`),
  KEY `idx_assigned_by` (`assigned_by`),
  KEY `idx_assignment_type` (`assignment_type`),
  KEY `idx_priority` (`priority`),
  KEY `idx_status` (`status`),
  KEY `idx_due_date` (`due_date`),
  KEY `idx_assignments_active` (`assigned_to`, `status`, `due_date`),
  KEY `idx_assignments_workload` (`assigned_to`, `status`, `priority`)
)
```

## Key Changes

### 1. Frontend JavaScript (assignment-system.js)

The JavaScript module has been updated to:

- Use the correct database field names (`assigned_to` instead of `assigned_to_id` and `assigned_to_type`)
- Support assignment types ('review', 'approval', 'verification', 'follow_up')
- Support priority levels ('low', 'normal', 'high', 'urgent')
- Support status values ('active', 'completed', 'cancelled', 'overdue')
- Handle due dates for assignments
- Provide status-specific UI rendering (color-coded badges)
- Include proper completion and cancellation workflows

#### Key Function Updates:

- `assignMember()`: Updated parameters to align with database schema
- `unassignMember()`: Added support for setting status (cancelled/completed)
- `transferAssignments()`: Updated to work with admin assignments only
- `loadAssignedMembers()`: Updated to filter by status
- UI rendering functions: Enhanced to display priority, status, and due dates

### 2. PHP Backend Services (AssignmentService.php)

The service layer has been updated to:

- Use the correct table name (`admin_assignments` instead of `member_assignments`)
- Use the correct field names to match the database schema
- Support all enum values for assignment_type, priority, and status
- Handle due dates and completion information
- Provide enhanced notification details including assignment type and priority

#### Key Method Updates:

- `assignMember()`: Updated parameters and query to match database schema
- `unassignMember()`: Changed to update status rather than marking inactive
- `getAssignedMembers()`: Updated to filter by status and use correct fields
- All SQL queries: Updated to use correct table and field names

### 3. API Endpoints

The API endpoints have been updated to:

- Accept the correct parameters from the frontend
- Validate enum values against allowed options
- Handle optional parameters properly
- Pass the correct parameters to service methods

#### Key Endpoint Updates:

- `assign.php`: Updated to handle assignment_type, priority, and due_date
- `unassign.php`: Updated to handle status changes (cancelled/completed)
- `list-assigned.php`: Updated to filter by status
- All endpoints: Enhanced parameter validation

## API Reference

### 1. Assign Member

**Endpoint:** `/api/assignments/assign.php`

**Method:** POST

**Parameters:**
- `member_id` (required): ID of the member to assign
- `assigned_to` (required): ID of the admin to assign to
- `assignment_type` (optional): Type of assignment ('review', 'approval', 'verification', 'follow_up'), default is 'review'
- `priority` (optional): Priority level ('low', 'normal', 'high', 'urgent'), default is 'normal'
- `notes` (optional): Notes about the assignment
- `due_date` (optional): Due date for the assignment (format: YYYY-MM-DD HH:MM:SS)

**Response:**
```json
{
  "success": true,
  "assignment_id": 123,
  "message": "Member John Doe has been assigned to admin_user successfully for review"
}
```

### 2. Unassign Member

**Endpoint:** `/api/assignments/unassign.php`

**Method:** POST

**Parameters:**
- `assignment_id` (required): ID of the assignment to update
- `reason` (optional): Reason for cancellation or completion notes
- `status` (optional): Status to set ('cancelled' or 'completed'), default is 'cancelled'

**Response:**
```json
{
  "success": true,
  "message": "Assignment for member John Doe has been cancelled"
}
```

### 3. List Assigned Members

**Endpoint:** `/api/assignments/list-assigned.php`

**Method:** GET

**Parameters:**
- `assigned_to` (required): ID of the admin
- `status` (optional): Status filter ('active', 'completed', 'cancelled', 'overdue', 'all'), default is 'active'

**Response:**
```json
{
  "success": true,
  "data": [
    {
      "id": 123,
      "member_id": 456,
      "first_name": "John",
      "last_name": "Doe",
      "kso_id": "KSO-2025-001",
      "assignment_type": "review",
      "priority": "normal",
      "status": "active",
      "due_date": "2025-08-01 00:00:00",
      "created_at": "2025-07-15 10:30:00"
    }
  ]
}
```

### 4. Get Member Assignments

**Endpoint:** `/api/assignments/list-member.php`

**Method:** GET

**Parameters:**
- `member_id` (required): ID of the member

**Response:**
```json
{
  "success": true,
  "data": [
    {
      "id": 123,
      "assigned_to": 789,
      "admin_name": "admin_user",
      "assignment_type": "review",
      "priority": "normal",
      "status": "active",
      "due_date": "2025-08-01 00:00:00",
      "created_at": "2025-07-15 10:30:00"
    }
  ]
}
```

### 5. Transfer Assignments

**Endpoint:** `/api/assignments/transfer.php`

**Method:** POST

**Parameters:**
- `from_admin` (required): Source admin ID
- `to_admin` (required): Target admin ID
- `notes` (optional): Notes about the transfer
- `assignment_type` (optional): Filter by assignment type
- `priority` (optional): Filter by priority

**Response:**
```json
{
  "success": true,
  "transferred_count": 5,
  "message": "5 assignments transferred successfully"
}
```

## Frontend Components

### Member Assignment Display

```html
<div id="member-assignments-container">
  <!-- Populated by AssignmentSystem.loadMemberAssignments(memberId) -->
</div>
```

### Admin's Assigned Members Display

```html
<div id="assigned-members-container">
  <!-- Populated by AssignmentSystem.loadAssignedMembers(adminId, status) -->
</div>
```

### Assignment Statistics Display

```html
<div id="assignment-stats">
  <!-- Populated by AssignmentSystem.loadAssignmentStats() -->
</div>
```

## Usage Examples

### Initialize Assignment System

```javascript
// Initialize when document is ready
document.addEventListener('DOMContentLoaded', function() {
  AssignmentSystem.init();
});
```

### Assign a Member

```javascript
// Assign a member to an admin
AssignmentSystem.assignMember(
  memberId,               // Member ID
  adminId,                // Admin ID
  'review',               // Assignment type
  'normal',               // Priority
  'Additional notes...',  // Notes
  '2025-08-15 17:00:00'   // Due date
);
```

### Load Member Assignments

```javascript
// Display assignments for a specific member
AssignmentSystem.loadMemberAssignments(memberId);
```

### Load Assigned Members

```javascript
// Display members assigned to an admin with status filter
AssignmentSystem.loadAssignedMembers(adminId, 'active');
```

## Implementation Notes

1. **Status Management**:
   - Active assignments appear with green badges
   - Completed assignments appear with blue badges
   - Cancelled assignments appear with gray badges
   - Overdue assignments appear with red badges

2. **Priority Levels**:
   - Low: Gray badge
   - Normal: Blue badge
   - High: Yellow/orange badge
   - Urgent: Red badge

3. **Assignment Types**:
   - Review: Standard review of member information
   - Approval: Approval workflow for member requests
   - Verification: Document or information verification
   - Follow-up: Follow-up with member on specific issues

4. **Due Dates**:
   - Assignments can have optional due dates
   - System will automatically mark assignments as overdue after the due date

## Error Handling

The assignment system includes comprehensive error handling:

- All API endpoints return detailed error messages
- The frontend displays appropriate error notifications
- Database operations are wrapped in transactions for data integrity
- Input validation occurs at both frontend and backend levels

## Known Limitations

1. **Bulk Operations**: The current system does not support bulk assignment or unassignment operations
2. **Recurring Assignments**: There is no support for recurring assignments
3. **Assignment History**: The system does not maintain a detailed history of status changes

## Future Enhancements

1. **Email Notifications**: Add email notifications for assignment creation and status changes
2. **Bulk Assignment**: Support for assigning multiple members at once
3. **Assignment Templates**: Pre-defined assignment templates for common workflows
4. **Dashboard Widgets**: Enhanced dashboard widgets showing assignment statistics
5. **Calendar Integration**: Display assignments on a calendar view with due dates

---

*Documentation updated: July 15, 2025*
