# Self-Assignment Feature

## Overview

The self-assignment feature empowers field agents to pick their own work from an available ticket pool, reducing dispatcher workload and giving agents autonomy over their daily schedule.

## Key Benefits

### For Agents
- **Autonomy**: Choose tickets based on location, complexity, or schedule
- **Better Route Planning**: Agents know their areas and can optimize travel
- **Faster Pickup**: No waiting for dispatcher assignment
- **Workload Control**: Visual capacity management (max 4 active tickets)

### For Dispatchers
- **Reduced Workload**: Agents handle routine assignments themselves
- **Focus on Priorities**: Dispatch only VIP/escalated tickets manually
- **Better Resource Utilization**: Agents pick work they're best suited for

### For Business
- **Faster Ticket Resolution**: Reduced assignment delays
- **Improved Efficiency**: Better geographic clustering
- **Audit Trail**: Complete tracking of who picked what and when

---

## How It Works

### 1. Available Ticket Pool

Agents see tickets that are:
- ✅ **Status = OPEN** (not assigned, in_progress, completed, or cancelled)
- ✅ **In Agent's Region** (based on `project_team.project_region_id`)
- ✅ **From Agent's Projects** (agent must be on project team)
- ✅ **Ordered by Priority** (high priority, urgent, oldest first)

```
GET /api/v1/assignments/tickets/available-for-me
```

**Response:**
```json
{
  "agent_id": "agent-uuid",
  "agent_region_id": "region-uuid",
  "current_active_count": 2,
  "max_capacity": 4,
  "remaining_capacity": 2,
  "available_tickets": [
    {
      "id": "ticket-uuid",
      "ticket_name": "John Doe - Fiber Installation",
      "ticket_type": "installation",
      "service_type": "fiber",
      "priority": "high",
      "status": "open",
      "work_description": "Install 50Mbps fiber connection",
      "scheduled_date": "2024-03-20",
      "due_date": "2024-03-20T17:00:00Z",
      "sla_violated": false,
      "project_region_id": "region-uuid"
    }
  ],
  "total_available": 15
}
```

### 2. Self-Assign Ticket

Agent picks ticket from pool:

```
POST /api/v1/assignments/tickets/{ticket_id}/self-assign
```

**Request:**
```json
{
  "execution_order": 1,
  "planned_start_time": "2024-03-20T09:00:00Z",
  "notes": "I know this area well, can complete quickly"
}
```

**Validations:**
- ✅ Ticket is OPEN (not already assigned)
- ✅ Agent is on project team
- ✅ Agent's region matches ticket region
- ✅ Agent has capacity (< 4 active tickets)
- ✅ No duplicate active assignment

**Effects:**
- Creates assignment with `action='self_assigned'` and `is_self_assigned=True`
- `assigned_by_user_id` = `user_id` (self)
- Ticket status changes: `open` → `assigned`

---

## Regional Filtering

### Agent Regional Assignment

In `project_team` table:
- **`project_region_id = NULL`**: Agent can work **all regions** in that project
- **`project_region_id = <region_id>`**: Agent limited to **specific region**

### Ticket Pool Filtering

System shows tickets based on agent's regional assignments:

```python
# If agent can work all regions in Project A
Agent can see: All tickets from Project A (regardless of ticket.project_region_id)

# If agent is limited to Region X in Project A
Agent can see: Only tickets from Project A where ticket.project_region_id = Region X
```

---

## Capacity Management

### Rules
- **Max Active Tickets**: 4 per agent
- **Active Definition**: `ended_at IS NULL`
- **Daily Limit**: None (agent can complete 10+ tickets per day)
- **Prevents Hoarding**: Can't pick more than 4 at once

### Lifecycle Example

**Morning:**
```
Agent has 0 active → Picks 3 tickets → Now has 3 active
```

**Mid-Day:**
```
Agent completes 2 tickets → Now has 1 active
Agent picks 2 more tickets → Now has 3 active
```

**Afternoon:**
```
Agent drops 1 ticket (customer unavailable) → Now has 2 active
Agent picks 2 more tickets → Now has 4 active (AT CAPACITY)
```

**End of Day:**
```
Agent completes 3 tickets → Now has 1 active
Total completed: 8 tickets in one day ✅
```

---

## Assignment Types

### Manual Assignment (Dispatcher/PM)

**Use Cases:**
- VIP customers requiring best technician
- Escalated tickets needing immediate attention
- Team assignments (multiple agents)
- Scheduled appointments

**Action:** `'assigned'`  
**is_self_assigned:** `False`

### Self-Assignment (Agent)

**Use Cases:**
- Routine installations
- Standard support tickets
- Agent-driven scheduling
- Regional work optimization

**Action:** `'self_assigned'`  
**is_self_assigned:** `True`

---

## Multiple Assignment Attempts

### Same Ticket, Multiple Days

Agents can be assigned to same ticket multiple times (different attempts):

**Monday:**
```
Agent picks Ticket #123 → Arrives → Customer unavailable → Drops ticket
Assignment #1: ended_at = Monday 2PM
```

**Tuesday:**
```
Ticket #123 reopened → Agent picks again → Completes successfully
Assignment #2: ended_at = Tuesday 11AM
```

**Benefits:**
- Each attempt has separate expense tracking
- Complete audit trail preserved
- Historical data for performance metrics

**Validation:**
- ❌ Can't have 2+ **active** assignments for same ticket
- ✅ Can have multiple **historical** assignments for same ticket

---

## API Endpoints

### Self-Assignment

| Method | Endpoint | Description | Auth |
|--------|----------|-------------|------|
| GET | `/api/v1/assignments/tickets/available-for-me` | Get available tickets for agent | Agent |
| POST | `/api/v1/assignments/tickets/{ticket_id}/self-assign` | Self-assign ticket | Agent |

### Manual Assignment (Existing)

| Method | Endpoint | Description | Auth |
|--------|----------|-------------|------|
| POST | `/api/v1/assignments/tickets/{ticket_id}/assign` | Assign to agent | Dispatcher/PM |
| POST | `/api/v1/assignments/tickets/{ticket_id}/assign-team` | Assign to team | Dispatcher/PM |

### Agent Actions (Existing)

| Method | Endpoint | Description |
|--------|----------|-------------|
| POST | `/assignments/{id}/accept` | Accept assignment |
| POST | `/assignments/{id}/reject` | Reject assignment |
| POST | `/assignments/{id}/start-journey` | Begin travel |
| POST | `/assignments/{id}/arrived` | Mark arrival |
| POST | `/assignments/{id}/complete` | Complete work |
| POST | `/assignments/{id}/drop` | Drop ticket |

---

## Error Handling

### 409 Conflict
```json
{
  "detail": "Ticket is not available for self-assignment (status: assigned)"
}
```
**Reason:** Someone else picked the ticket first (race condition)

### 409 Conflict
```json
{
  "detail": "Agent has reached capacity (4 active tickets)"
}
```
**Reason:** Agent already has 4 active tickets

### 403 Forbidden
```json
{
  "detail": "This ticket is not in your assigned region"
}
```
**Reason:** Ticket's region doesn't match agent's regional assignment

### 400 Bad Request
```json
{
  "detail": "Agent is not on this project's team"
}
```
**Reason:** Agent not added to project team

---

## Database Schema

### ticket_assignments Table

```sql
CREATE TABLE ticket_assignments (
    id UUID PRIMARY KEY,
    ticket_id UUID REFERENCES tickets(id),
    user_id UUID REFERENCES users(id),
    assigned_by_user_id UUID REFERENCES users(id), -- Self: user_id = assigned_by_user_id
    
    -- Assignment type
    action TEXT, -- 'assigned' | 'self_assigned' | 'rejected' | 'dropped' | etc.
    is_self_assigned BOOLEAN DEFAULT FALSE, -- TRUE for self-picked tickets
    
    -- Execution planning
    execution_order INTEGER,
    planned_start_time TIMESTAMPTZ,
    
    -- Timeline
    assigned_at TIMESTAMPTZ NOT NULL,
    responded_at TIMESTAMPTZ,
    journey_started_at TIMESTAMPTZ,
    arrived_at TIMESTAMPTZ,
    ended_at TIMESTAMPTZ, -- NULL = active, NOT NULL = closed
    
    -- Metadata
    notes TEXT,
    reason TEXT
);
```

### project_team Table

```sql
CREATE TABLE project_team (
    id UUID PRIMARY KEY,
    project_id UUID REFERENCES projects(id),
    user_id UUID REFERENCES users(id),
    
    -- Regional assignment
    project_region_id UUID REFERENCES project_regions(id), -- NULL = all regions
    
    role TEXT,
    assigned_at TIMESTAMPTZ,
    removed_at TIMESTAMPTZ
);
```

---

## Testing Scenarios

### Scenario 1: Agent Picks Available Ticket
```
1. Agent calls GET /tickets/available-for-me
2. System returns 15 open tickets in agent's region
3. Agent picks ticket #1
4. POST /tickets/{ticket-1}/self-assign
5. Assignment created with is_self_assigned=True
6. Ticket status: open → assigned
```

### Scenario 2: Race Condition (Two Agents Pick Same Ticket)
```
1. Agent A and Agent B both see ticket #123 in pool
2. Agent A picks ticket #123 at 9:00:01
3. Agent B tries to pick ticket #123 at 9:00:02
4. System returns 409: "Ticket is not available" (already assigned)
5. Agent B picks different ticket from pool
```

### Scenario 3: At Capacity
```
1. Agent has 4 active tickets
2. Agent tries to pick 5th ticket
3. System returns 409: "Agent has reached capacity (4 active tickets)"
4. Agent must complete/drop existing ticket first
```

### Scenario 4: Regional Restriction
```
1. Agent assigned to Region A only
2. Ticket #456 is in Region B
3. Agent tries to pick ticket #456
4. System returns 403: "This ticket is not in your assigned region"
5. Agent can only pick tickets from Region A
```

### Scenario 5: Customer Unavailable - Re-pick
```
Day 1:
1. Agent picks ticket #789
2. Agent arrives at site
3. Customer unavailable
4. Agent drops ticket (ended_at = Day 1)

Day 2:
1. Ticket #789 reopened (status = open)
2. Agent picks ticket #789 again (NEW assignment)
3. Agent completes work
4. Two assignments in history for same ticket
```

---

## Configuration

### Capacity Settings

In `ticket_assignment_service.py`:
```python
MAX_AGENT_CAPACITY = 4  # Maximum active tickets per agent
```

**Rationale:**
- Minimum 3 tickets per day expected
- +1 for ambitious agents
- Prevents ticket hoarding
- Maintains work quality

---

## Future Enhancements

### Potential Features
1. **Smart Recommendations**: AI suggests best tickets based on agent skills/location
2. **Auto-Assignment**: System auto-assigns based on proximity and workload
3. **Team Self-Assignment**: Agents pick team tickets together
4. **Scheduled Picking**: Agents reserve tickets for specific time slots
5. **Priority Booking**: High-performing agents get first pick
6. **Geographic Clustering**: Show map view of available tickets

---

## Migration Path

### Phase 1: Current State (Manual Only)
- All assignments done by dispatcher
- No agent autonomy

### Phase 2: Hybrid (Manual + Self)
- Agents can self-assign routine tickets
- Dispatchers assign VIP/escalated tickets
- Monitor adoption and performance

### Phase 3: Future (AI-Assisted)
- System recommends optimal tickets
- Smart auto-assignment for urgent cases
- Dispatchers handle exceptions only

---

## Monitoring & Metrics

### Key Metrics to Track
- **Self-Assignment Rate**: % of tickets self-assigned vs dispatcher-assigned
- **Pickup Time**: Time from ticket creation to assignment
- **Completion Rate**: % of self-assigned tickets completed vs dropped
- **Regional Distribution**: Even workload across regions
- **Agent Satisfaction**: Survey feedback on autonomy

### Dashboard Views
- **Dispatcher**: See which agents are self-assigning effectively
- **Agent**: See capacity and available work
- **Manager**: Compare manual vs self-assignment performance

---

## Summary

✅ **Implemented Features:**
- Available ticket pool filtering by region
- Self-assignment with validation
- Capacity management (max 4 active)
- Multiple assignment attempts per ticket
- Complete audit trail

✅ **Benefits:**
- Reduced dispatcher workload
- Agent autonomy and efficiency
- Faster ticket pickup
- Better route optimization

✅ **Safeguards:**
- Regional restrictions enforced
- Capacity limits prevent hoarding
- Race condition handling
- Complete validation and error handling