# REST API Endpoints - Data Sources Explained

## Overview

This document explains where each REST API endpoint gets its data and how the flow works.

---

## 🎥 Camera Endpoints

### GET /api/v1/cameras

**Data Source**: GeViServer Camera Manager (real-time, in-memory)

**Flow**:
```
Client → FastAPI → gRPC (CameraService) → StateQueryHandler → SDK → GeViServer Camera Manager
```

**Code Path**:
1. `routers/cameras.py` - REST endpoint
2. `services/camera_service.py` - Business logic
3. `clients/sdk_bridge_client.py` - gRPC client
4. `Services/CameraService.cs` (C#) - gRPC service
5. `SDK/StateQueryHandler.cs` (C#) - SDK wrapper
6. `CSQGetFirstVideoInput()` + `CSQGetNextVideoInput()` - SDK enumeration

**What You Get**:
```json
[
  {
    "channel": 1,
    "name": "Front Door Camera",
    "description": "Main entrance",
    "has_ptz": true,
    "has_video_sensor": true,
    "status": "online"
  }
]
```

**Data Characteristics**:
- ✅ Real-time camera list
- ✅ Current connection status
- ✅ Live from GeViServer memory
- ❌ NOT stored in TestMKS.set
- 🔄 Changes when cameras connect/disconnect

---

## 📺 Monitor Endpoints

### GET /api/v1/monitors

**Data Source**: GeViServer Monitor Manager (real-time, in-memory)

**Flow**:
```
Client → FastAPI → gRPC (MonitorService) → StateQueryHandler → SDK → GeViServer Monitor Manager
```

**Code Path**:
1. `routers/monitors.py`
2. `services/monitor_service.py`
3. `clients/sdk_bridge_client.py`
4. `Services/MonitorService.cs` (C#)
5. `SDK/StateQueryHandler.cs` (C#)
6. `CSQGetFirstVideoOutput()` + `CSQGetNextVideoOutput()`

**What You Get**:
```json
[
  {
    "channel": 1,
    "name": "Main Monitor",
    "is_active": true,
    "current_camera_id": 7
  }
]
```

**Data Characteristics**:
- ✅ Real-time monitor/viewer list
- ✅ Current routing state (which camera is shown)
- ✅ GSCView client status
- ❌ NOT in TestMKS.set
- 🔄 Changes when monitors connect/disconnect

---

## 🔀 CrossSwitch Endpoints

### POST /api/v1/crossswitch

**Action**: Routes camera to monitor (sends command to GeViServer)

**Flow**:
```
Client → FastAPI → gRPC (CrossSwitchService) → ActionDispatcher → SDK → GeViServer Action Engine
```

**Request**:
```json
{
  "camera_id": 7,
  "monitor_id": 3,
  "mode": 0
}
```

**Code Path**:
1. `routers/crossswitch.py`
2. `services/crossswitch_service.py`
3. `Services/CrossSwitchService.cs` (C#)
4. `SDK/ActionDispatcher.cs` (C#)
5. `SendAction("CrossSwitch", ...)` - SDK action

**What Happens**:
- GeViServer routes video from Camera 7 to Monitor 3
- Monitor immediately shows the camera feed
- Routing state updated in GeViServer memory

### DELETE /api/v1/monitors/{id}

**Action**: Clears monitor (stops video display)

**Code Path**: Similar to CrossSwitch but calls `ClearVideoOutput` action

---

## ⚙️ Configuration Endpoints (✅ IMPLEMENTED)

### GET /api/v1/configuration/servers

**Data Source**: TestMKS.set file (persistent binary configuration)

**Flow**:
```
Client → FastAPI → gRPC (ConfigurationService) → SetupClient.Download() →
Parse .set file → Extract GeViGCoreServer folder → Return servers
```

**Code Path**:
1. `routers/configuration.py`
2. `services/configuration_service.py`
3. `clients/sdk_bridge_client.py`
4. `Services/ConfigurationService.cs` (C#) - gRPC service
5. `SDK/GeViSetupClientWrapper.cs` (C#) - Download config
6. `Services/FolderTreeParser.cs` (C#) - Parse binary .set
7. Navigate to "GeViGCoreServer" folder
8. Extract all server nodes

**What You Get**:
```json
[
  {
    "id": "1",
    "alias": "Remote Server 1",
    "host": "192.168.1.100",
    "user": "admin",
    "enabled": true,
    "deactivate_echo": false,
    "deactivate_live_check": false
  },
  {
    "id": "2",
    "alias": "Remote Server 2",
    ...
  }
]
```

**Data Characteristics**:
- ✅ Persistent in TestMKS.set file
- ✅ Survives GeViServer restart
- ✅ Visible in GeViSet UI
- 💾 Binary format, parsed on-demand
- 🔒 Requires SetupClient download

---

### POST /api/v1/configuration/servers

**Action**: Creates new G-Core server in configuration

**Flow**:
```
Client → FastAPI → gRPC → SetupClient.Download() → Parse .set →
Auto-increment ID → Create server node → Write tree → SetupClient.Upload()
```

**Request**:
```json
{
  "alias": "New Remote Server",
  "host": "192.168.1.200",
  "user": "admin",
  "password": "secret",
  "enabled": true
}
```

**What Happens**:
1. Downloads current TestMKS.set file
2. Parses binary format into folder tree
3. Finds GeViGCoreServer folder
4. Calculates new ID (max existing ID + 1)
5. Creates new server node with all fields
6. Writes modified tree back to binary
7. Uploads to GeViServer
8. GeViServer saves and reloads config

**Response**:
```json
{
  "id": "14",
  "alias": "New Remote Server",
  "host": "192.168.1.200",
  ...
}
```

---

### PUT /api/v1/configuration/servers/{server_id}

**Status**: ⚠️ KNOWN BUG - "Server ID is required"

**Intended Flow**: Download → Parse → Find server → Update fields → Upload

**Workaround**: Use DELETE + POST to replace server

---

### DELETE /api/v1/configuration/servers/{server_id}

**Action**: Removes server from configuration

**Flow**:
```
Client → FastAPI → gRPC → Download .set → Parse →
Find server node by ID → Remove node → Upload
```

**Critical Note**: When deleting multiple servers, always delete in **REVERSE ORDER** (highest ID first) to prevent ID shifting!

---

### GET /api/v1/configuration/action-mappings

**Data Source**: TestMKS.set file → ActionMapping folder

**Flow**: Same as servers, but navigates to "ActionMapping" folder

**What You Get**:
```json
[
  {
    "id": 1,
    "name": "Door Contact Mapping",
    "input_action": "GeVi DoorContact_101001",
    "output_action": "GeVi PanLeft_101027",
    "enabled": true
  }
]
```

**Data Characteristics**:
- ID is 1-based index in MappingRules list
- Each mapping links input action → output action
- Used for automation (e.g., door opens → camera pans)

---

### POST /api/v1/configuration/action-mappings

**Action**: Creates new action mapping

**Flow**: Download → Parse → Add to MappingRules list → Upload

**Request**:
```json
{
  "name": "VMD Trigger",
  "input_action": "GeVi VideoMotionDetection_7",
  "output_action": "GeVi StartRecording_7",
  "enabled": true
}
```

---

### PUT /api/v1/configuration/action-mappings/{mapping_id}

**Action**: Updates existing action mapping

**Flow**: Download → Parse → Find by ID → Update fields → Upload

**Status**: ✅ WORKING (all CRUD operations functional)

---

### DELETE /api/v1/configuration/action-mappings/{mapping_id}

**Action**: Removes action mapping

**Flow**: Download → Parse → Remove from list → Upload

**⚠️ CRITICAL**: When deleting multiple mappings, always delete in **REVERSE ORDER**!

**Why?** Mappings use 1-based indices. Deleting mapping #5 shifts all subsequent mappings down by 1 index.

**Example Bug**:
```
Original: [#1, #2, #3, #4, #5, #6]
Delete #4 → [#1, #2, #3, #5→4, #6→5]
Delete #5 (which is now actually #6!) → WRONG MAPPING DELETED!
```

**Solution**:
```python
# Sort by ID descending
mappings_sorted = sorted(mappings, key=lambda x: x['id'], reverse=True)
for mapping in mappings_sorted:
    delete_action_mapping(mapping['id'])  # Delete from highest to lowest
```

---

## 🔐 Authentication Endpoints

### POST /api/v1/auth/login

**Data Source**: PostgreSQL database (user credentials)

**Flow**: FastAPI → AuthService → Database query → JWT generation

**Not fully implemented yet** - authentication is stubbed out

---

## ❤️ Health Endpoint

### GET /api/v1/health

**Data Source**: Real-time component checks

**Checks**:
1. **Database**: PostgreSQL connection test
2. **Redis**: Cache connectivity
3. **SDK Bridge**: gRPC connection test (calls ping)

**Response**:
```json
{
  "status": "healthy",
  "version": "1.0.0",
  "components": {
    "database": "healthy",
    "redis": "healthy",
    "sdk_bridge": "healthy"
  },
  "timestamp": "2025-12-16T21:15:00Z"
}
```

---

## 🔍 Data Source Summary

| Endpoint Pattern | Data Source | Access Method | Persistent? |
|------------------|-------------|---------------|-------------|
| `/cameras` | GeViServer memory | SDK State Query | ❌ Real-time |
| `/monitors` | GeViServer memory | SDK State Query | ❌ Real-time |
| `/crossswitch` | GeViServer actions | SDK Action Dispatch | ❌ Command |
| `/configuration/servers` | TestMKS.set | SetupClient + Parser | ✅ Persistent |
| `/configuration/action-mappings` | TestMKS.set | SetupClient + Parser | ✅ Persistent |
| `/auth/*` | PostgreSQL | Database query | ✅ Persistent |
| `/health` | Component checks | Direct probe | ❌ Real-time |

---

## 🎯 Testing the API

### Using Swagger UI

1. Open http://localhost:8000/docs
2. All endpoints are documented with schemas
3. Click "Try it out" to test

### Using curl

```bash
# List cameras
curl http://localhost:8000/api/v1/cameras

# List servers
curl http://localhost:8000/api/v1/configuration/servers

# Get specific server
curl http://localhost:8000/api/v1/configuration/servers/1

# Create server
curl -X POST http://localhost:8000/api/v1/configuration/servers \
  -H "Content-Type: application/json" \
  -d '{
    "alias": "Test Server",
    "host": "192.168.1.50",
    "user": "admin",
    "password": "test123",
    "enabled": true
  }'

# Delete server
curl -X DELETE http://localhost:8000/api/v1/configuration/servers/14
```

### Using Python

```python
import requests

# List cameras
response = requests.get("http://localhost:8000/api/v1/cameras")
cameras = response.json()
print(f"Found {len(cameras)} cameras")

# Get all servers
response = requests.get("http://localhost:8000/api/v1/configuration/servers")
servers = response.json()
print(f"Found {len(servers)} servers")

# Create server
new_server = {
    "alias": "Python Test Server",
    "host": "192.168.1.99",
    "user": "admin",
    "password": "secret",
    "enabled": True
}
response = requests.post(
    "http://localhost:8000/api/v1/configuration/servers",
    json=new_server
)
created = response.json()
print(f"Created server with ID: {created['id']}")
```

---

## 🐛 Common Issues

### 1. Empty Camera List

**Cause**: No cameras configured in GeViServer

**Solution**: Add IP cameras in GeViSet or camera configuration

### 2. Configuration Endpoints Return Error

**Cause**: SetupClient cannot connect to GeViServer

**Possible reasons**:
- GeViSet is connected (blocks SetupClient port)
- GeViServer not running
- Port 7702 not available

**Solution**:
- Close GeViSet
- Ensure GeViServer is running
- Check `status-services.ps1`

### 3. CrossSwitch Fails

**Cause**: Invalid camera or monitor ID

**Solution**: First call `/cameras` and `/monitors` to get valid IDs

---

## 📚 Next Steps

1. **Test each endpoint** with Swagger UI
2. **Verify data sources** match expectations
3. **Check logs** for any errors
4. **Use test scripts** in repository root:
   - `comprehensive_crud_test.py` - Full CRUD test
   - `verify_config_via_grpc.py` - Config verification

---

**Last Updated**: 2025-12-16
**Version**: 1.0