Kao/README.md

# Kao

A minimalist system status monitor that uses ASCII emotes to display server health on an old phone.

![Status: Optimal](<https://img.shields.io/badge/status-(%20%5E___%5E)-brightgreen>)

## Why?

Turn an old phone (with its OLED screen) into a glanceable ambient display for your home server. Instead of graphs and numbers, see a happy face `( ^_^)` when things are good, and a worried face `( o_o)` when they're not.

## Features

- **OLED-optimized** — Pure black background, saves battery
- **Glanceable** — Know your server's status from across the room
- **Extensible** — Add custom detectors for any metric
- **Personality** — Rotating expressions, celebration animations, sleep mode
- **Sound effects** — Optional audio cues for state changes (tap to enable)
- **Home Assistant ready** — Webhook endpoints for notifications and automation

## Quick Start

```bash
# Clone and setup
git clone https://github.com/yourusername/kao.git
cd kao
python -m venv venv
source venv/bin/activate  # Windows: .\venv\Scripts\activate
pip install -r requirements.txt

# Run everything
python kao.py
```

Open http://localhost:5100 on your phone (use Fully Kiosk Browser for best results).

## Status Faces

| State        | Emote       | Meaning                   |
| ------------ | ----------- | ------------------------- |
| Optimal      | `( ^_^)`    | All systems healthy       |
| Warning      | `( o_o)`    | Something needs attention |
| Critical     | `( x_x)`    | Immediate action required |
| Notify       | `( 'o')`    | Transient notification    |
| Sleeping     | `( -_-)zzZ` | Sleep mode active         |
| Disconnected | `( ?.?)`    | Can't reach server        |

## Built-in Detectors

| Detector       | Monitors                              |
| -------------- | ------------------------------------- |
| **disk_space** | Disk usage on all drives              |
| **cpu**        | CPU utilization                       |
| **memory**     | RAM usage                             |
| **service**    | Whether processes are running         |
| **network**    | Host reachability (ping)              |
| **docker**     | Container health and restart loops    |

## Configuration

Edit `config.json` to enable/disable detectors and set thresholds:

```json
{
	"aggregator_url": "http://localhost:5100",
	"detectors": [
		{
			"name": "disk_space",
			"enabled": true,
			"script": "detectors/disk_space.py",
			"env": {
				"CHECK_INTERVAL": "300",
				"THRESHOLD_WARNING": "85",
				"THRESHOLD_CRITICAL": "95"
			}
		}
	]
}
```

## Custom Detectors

Create your own detector by POSTing events to the aggregator:

```bash
curl -X POST http://localhost:5100/event \
  -H "Content-Type: application/json" \
  -d '{"id": "my_check", "priority": 2, "message": "Something is wrong", "ttl": 120}'
```

- `id` — Unique identifier for this event
- `priority` — 1 (critical), 2 (warning), 3 (notify), 4 (optimal)
- `message` — What to display
- `ttl` — Auto-expire after N seconds (for heartbeat pattern)

Clear an event:

```bash
curl -X POST http://localhost:5100/clear \
  -d '{"id": "my_check"}'
```

## Home Assistant Integration

Add REST commands to your `configuration.yaml`:

```yaml
rest_command:
  kao_notify:
    url: "http://YOUR_SERVER:5100/notify"
    method: POST
    content_type: "application/json"
    payload: '{"message": "{{ message }}", "duration": {{ duration | default(5) }}}'

  kao_sleep:
    url: "http://YOUR_SERVER:5100/sleep"
    method: POST

  kao_wake:
    url: "http://YOUR_SERVER:5100/wake"
    method: POST
```

Use in automations:

```yaml
automation:
  - alias: "Doorbell Notification"
    trigger:
      platform: state
      entity_id: binary_sensor.doorbell
      to: "on"
    action:
      service: rest_command.kao_notify
      data:
        message: "Someone at the door"
        duration: 10

  - alias: "Kao Sleep at Bedtime"
    trigger:
      platform: time
      at: "23:00:00"
    action:
      service: rest_command.kao_sleep

  - alias: "Kao Wake in Morning"
    trigger:
      platform: time
      at: "07:00:00"
    action:
      service: rest_command.kao_wake
```

## API Reference

| Endpoint  | Method | Description                                      |
| --------- | ------ | ------------------------------------------------ |
| `/`       | GET    | Web UI                                           |
| `/status` | GET    | Current state as JSON                            |
| `/events` | GET    | List all active events                           |
| `/event`  | POST   | Register an event                                |
| `/clear`  | POST   | Clear an event by ID                             |
| `/notify` | POST   | Simple notification `{"message": "", "duration": 5}` |
| `/sleep`  | POST   | Enter sleep mode                                 |
| `/wake`   | POST   | Exit sleep mode                                  |

## Personality

The emote has personality! In optimal state it:

- Rotates through happy faces every 5 minutes
- Occasionally winks `( -_^)` or blinks `( ᵕ.ᵕ)` for a second or two
- Celebrates `\(^o^)/` when recovering from warnings
- Each face has its own animation (floating, bouncing, swaying)
- Reacts when tapped `( °o°)` and shows version info

**Sound effects** (tap screen to enable, or use `?sound=on`):
- Warning: soft double-beep
- Critical: urgent descending tone
- Notify: gentle ping
- Recovery: happy ascending chirp

## License

MIT