# Inventory API - Field Agent Quick Reference

## Base URL
`/api/v1/inventory`

---

## Field Agent Endpoints

### 1. Get My Inventory Stats
**GET** `/my-stats`

**Purpose:** Dashboard stats for field agents

**Response:**
```json
{
  "user_id": "uuid",
  "user_name": "John Doe",
  "total_assignments": 25,
  "active_assignments": 3,
  "returned_count": 18,
  "installed_count": 4,
  "consumed_count": 0,
  "by_item_type": {
    "tool": 1,
    "equipment": 2,
    "consumable": 0,
    "ppe": 0
  }
}
```

---

### 2. Get My Current Inventory
**GET** `/my-inventory`

**Purpose:** See what equipment I currently have (not returned/installed/consumed)

**Response:**
```json
{
  "items": [
    {
      "id": "uuid",
      "unit_identifier": "ONT-12345",
      "equipment_type": "ONT",
      "equipment_name": "Huawei HG8546M",
      "item_type": "equipment",
      "issued_at": "2025-12-01T08:30:00Z",
      "days_issued": 5,
      "status": "issued",
      "is_active": true,
      "ticket_id": "uuid",
      "ticket_reference": "TKT-001",
      "region_name": "Nairobi West",
      "notes": "For installation at customer site"
    }
  ],
  "total": 3,
  "page": 1,
  "page_size": 100,
  "total_pages": 1
}
```

---

### 3. Get Available Inventory at Hub
**GET** `/regions/{region_id}/available`

**Purpose:** See what's available at my regional hub before going to collect

**Response:**
```json
{
  "items": [
    {
      "id": "uuid",
      "equipment_type": "ONT",
      "equipment_name": "Huawei HG8546M",
      "item_type": "equipment",
      "quantity_available": 45.00,
      "quantity_allocated": 100.00,
      "quantity_issued": 55.00,
      "region_name": "Nairobi West",
      "allocated_date": "2025-11-15",
      "serial_numbers": [...]
    }
  ],
  "total": 5,
  "page": 1,
  "page_size": 100,
  "total_pages": 1
}
```

---

### 4. Record Collection from Hub
**POST** `/assignments`

**Purpose:** Record what I collected from the hub (self-service)

**Request:**
```json
{
  "project_inventory_distribution_id": "uuid",
  "unit_identifier": "ONT-12345",
  "ticket_id": "uuid",
  "notes": "Collected for TKT-001"
}
```

**Notes:**
- `user_id` is optional - auto-set to yourself for self-service
- Field agents can only record for themselves (admins/PMs can specify user_id for others)
- `unit_identifier` must be unique (serial number, box number, etc.)
- `ticket_id` is optional - link to ticket if you know which job it's for

**Response:**
```json
{
  "id": "uuid",
  "unit_identifier": "ONT-12345",
  "equipment_type": "ONT",
  "equipment_name": "Huawei HG8546M",
  "item_type": "equipment",
  "issued_at": "2025-12-01T10:30:00Z",
  "issued_by_user_id": "uuid",
  "status": "issued",
  "is_active": true,
  "days_issued": 0,
  "ticket_id": "uuid",
  "notes": "Collected for TKT-001"
}
```

---

### 5. Return Tool to Hub
**POST** `/assignments/{assignment_id}/return`

**Purpose:** Record tool return (for reusable tools only)

**Request:**
```json
{
  "return_condition": "good",
  "return_notes": "Tool in good condition"
}
```

**Valid conditions:** `good`, `damaged`, `lost`, `worn`

**Response:**
```json
{
  "id": "uuid",
  "unit_identifier": "DRILL-789",
  "equipment_type": "Drill",
  "item_type": "tool",
  "issued_at": "2025-11-28T08:00:00Z",
  "returned_at": "2025-12-01T17:00:00Z",
  "return_condition": "good",
  "is_returned": true,
  "status": "returned",
  "days_issued": 3
}
```

---

### 6. Mark Equipment as Installed
**POST** `/assignments/{assignment_id}/install`

**Purpose:** Mark equipment as installed at customer site (for equipment only)

**Request:**
```json
{
  "ticket_id": "uuid",
  "installation_notes": "Installed at customer premises"
}
```

**Response:**
```json
{
  "id": "uuid",
  "unit_identifier": "ONT-12345",
  "equipment_type": "ONT",
  "item_type": "equipment",
  "issued_at": "2025-12-01T08:30:00Z",
  "installed_at": "2025-12-01T14:30:00Z",
  "status": "installed",
  "is_active": false,
  "days_issued": 0,
  "ticket_id": "uuid"
}
```

---

### 7. Link Equipment to Ticket
**POST** `/assignments/{assignment_id}/link-ticket?ticket_id={ticket_id}`

**Purpose:** Link collected equipment to a specific ticket/job

**Query Params:**
- `ticket_id` (required): UUID of ticket to link to

**Response:**
```json
{
  "id": "uuid",
  "unit_identifier": "ONT-12345",
  "ticket_id": "uuid",
  "ticket_reference": "TKT-001",
  "status": "issued",
  "additional_metadata": {
    "linked_to_ticket_at": "2025-12-01T10:45:00Z",
    "linked_by_user_id": "uuid"
  }
}
```

---

### 8. List My Assignments (with filters)
**GET** `/assignments?user_id={user_id}&status={status}&is_returned={bool}`

**Purpose:** View assignment history with filters

**Query Params:**
- `page` (default: 1)
- `page_size` (default: 50, max: 100)
- `user_id` (optional): Filter by user (field agents auto-filtered to self)
- `status` (optional): `issued`, `returned`, `installed`
- `is_returned` (optional): `true` or `false`
- `ticket_id` (optional): Filter by ticket

**Response:**
```json
{
  "items": [...],
  "total": 25,
  "page": 1,
  "page_size": 50,
  "total_pages": 1
}
```

---

## Item Types & Workflows

### Tool (Returnable)
1. Collect from hub → `POST /assignments`
2. Use for job
3. Return to hub → `POST /assignments/{id}/return`

### Equipment (Installable)
1. Collect from hub → `POST /assignments`
2. Link to ticket → `POST /assignments/{id}/link-ticket`
3. Install at customer → `POST /assignments/{id}/install`

### Consumable (Single-use)
1. Collect from hub → `POST /assignments`
2. Use up (no return needed)

### PPE (Long-term)
1. Collect from hub → `POST /assignments`
2. Keep for extended period

---

## Error Responses

**400 Bad Request:**
```json
{
  "detail": "No inventory available at this regional hub"
}
```

**403 Forbidden:**
```json
{
  "detail": "Not authorized to record inventory collection at this region"
}
```

**404 Not Found:**
```json
{
  "detail": "Assignment not found: {uuid}"
}
```

**409 Conflict:**
```json
{
  "detail": "Unit ONT-12345 already assigned"
}
```

---

---

### 9. Initiate Transfer to Another Agent
**POST** `/assignments/{assignment_id}/transfer`

**Purpose:** Transfer equipment to another field agent (peer-to-peer)

**Request:**
```json
{
  "to_user_id": "uuid",
  "transfer_reason": "Agent B needs ONT urgently, I have extra",
  "requires_approval": true,
  "transfer_latitude": -1.2921,
  "transfer_longitude": 36.8219,
  "notes": "Meeting at regional office"
}
```

**Response:**
```json
{
  "id": "uuid",
  "from_assignment_id": "uuid",
  "from_user_id": "uuid",
  "to_user_id": "uuid",
  "unit_identifier": "ONT-12345",
  "transfer_reason": "Agent B needs ONT urgently, I have extra",
  "status": "pending",
  "requires_approval": true,
  "created_at": "2025-12-01T10:00:00Z"
}
```

---

### 10. Accept Transfer
**POST** `/transfers/{transfer_id}/accept`

**Purpose:** Accept equipment transfer from another agent

**Response:**
```json
{
  "id": "uuid",
  "status": "completed",
  "to_assignment_id": "uuid",
  "accepted_by_to_user_at": "2025-12-01T10:30:00Z",
  "completed_at": "2025-12-01T10:30:00Z"
}
```

---

### 11. Get My Pending Transfers
**GET** `/transfers/pending`

**Purpose:** See transfers waiting for my acceptance

**Response:**
```json
{
  "incoming": [
    {
      "id": "uuid",
      "from_user_name": "John Doe",
      "unit_identifier": "ONT-12345",
      "equipment_name": "Huawei HG8546M",
      "transfer_reason": "You need this for urgent job",
      "status": "approved",
      "created_at": "2025-12-01T09:00:00Z"
    }
  ],
  "outgoing": [
    {
      "id": "uuid",
      "to_user_name": "Jane Smith",
      "unit_identifier": "DRILL-789",
      "equipment_name": "Power Drill",
      "status": "pending",
      "created_at": "2025-12-01T08:00:00Z"
    }
  ]
}
```

---

## Authorization

All endpoints require authentication. Field agents can only:
- View their own assignments
- Record their own collections
- Return their own items
- View available inventory at hubs in their project
- Initiate transfers of their own equipment
- Accept transfers sent to them

Admins/PMs can perform actions on behalf of any user and approve transfers.