# CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

## Project Overview

See README.md for complete project description, installation instructions, and usage details.

This is a Wake-on-LAN (WOL) Manager - a containerized Flask web application for managing and remotely waking computers on a local network.

## Architecture & Code Structure

- **Backend**: Flask web application (`app/app.py`) with RESTful API endpoints
- **Frontend**: Single-page application with vanilla JavaScript (`app/templates/index.html`) 
- **Storage**: File-based configuration in `/data/wol-computers.conf`
- **Deployment**: Docker with docker compose, requires privileged networking

### Key Components

- `WOLManager` class in `app/app.py`: Core logic for computer management, WOL operations, and network scanning
- Configuration format: `name|mac|ip` (pipe-separated values in `/data/wol-computers.conf`)
- Dependencies: `wakeonlan`, `nmap`, `ping`, `arp` system tools
- **Windows PowerShell scanner**: `scripts/windows-network-scan.ps1` - optimized network scanning from Windows host

## Development Commands

**For installation and basic usage, see README.md**

### Docker Development

**Note**: When running from WSL with Docker Desktop on Windows, use `docker.exe compose`:

```bash
# Development build and run
docker compose up -d --build
# From WSL: docker.exe compose up -d --build

# View real-time logs  
docker compose logs -f wol-web
# From WSL: docker.exe compose logs -f wol-web

# Shell access to container
docker compose exec wol-web bash
# From WSL: docker.exe compose exec wol-web bash

# Stop containers
docker compose down
# From WSL: docker.exe compose down
```

### Network Requirements
- Runs on port 5000 (configurable via WOL_EXTERNAL_PORT env var)
- Requires `NET_ADMIN` and `NET_RAW` capabilities  
- Uses `network_mode: host` for WOL packet transmission
- Must run with `privileged: true` for network operations

## Network Scanning

**Two scanning modes available:**

### 1. Container-based scanning (Limited)
- Uses Linux tools: `arp`, `ping`, `nmap` 
- Limited in Docker Desktop Windows environment
- Fallback method when Windows scanning unavailable

### 2. Windows PowerShell scanning (Recommended)
- Script: `scripts/windows-network-scan.ps1`
- Features:
  - Automatic local network detection
  - Interactive network selection menu
  - Parallel ping sweeps with configurable batch sizes
  - Hostname resolution via DNS
  - MAC address retrieval from ARP table/NetNeighbor
  - Real-time progress indication
  - Results saved to `/data/network-scan-results.json`

**Usage patterns:**
```powershell
# Interactive mode with network selection menu
scripts\windows-network-scan.ps1

# Direct network specification
scripts\windows-network-scan.ps1 -Network "192.168.1.0/24"

# Advanced options
scripts\windows-network-scan.ps1 -Network "192.168.100.0/24" -TimeoutMs 500 -BatchSize 20 -Verbose
```

**Integration:**
- Web app automatically reads Windows scan results from JSON file
- Results cached for 30 minutes
- App falls back to Linux scanning if Windows results unavailable

## API Endpoints

- `GET /api/computers` - List configured computers with status
- `POST /api/wake` - Wake specific computer (`{mac, name, ip}`)
- `POST /api/wake-all` - Wake all configured computers  
- `POST /api/add` - Add new computer (`{name, mac, ip}`)
- `GET /api/scan` - Network scan for devices (tries Windows results first, then Linux fallback)
- `POST /api/scan/windows` - Trigger Windows PowerShell scan (attempts automatic execution)

## Development Notes

- Application uses Romanian language in UI
- No authentication/authorization implemented
- Configuration persisted in volume-mounted `/data` directory
- Flask runs in debug=False mode in container

### Windows Integration Details

**File Integration:**
- Windows scan results: `/data/network-scan-results.json`
- Results format: `{success, timestamp, networks_scanned, computers[], message}`
- Computer format: `{ip, mac, hostname, status}`
- Results expire after 30 minutes

**WSL Integration:**
- App attempts automatic PowerShell execution via WSL interop
- Path: `/mnt/c/Windows/System32/WindowsPowerShell/v1.0/powershell.exe`
- Fallback: Manual execution instructions provided when auto-execution fails

**Scanning Logic in `app.py`:**
- `scan_network()` - Main entry point, tries Windows results first (`app/app.py:164`)
- `try_read_windows_scan_results()` - Reads and validates Windows JSON results (`app/app.py:176`)
- `scan_network_linux()` - Fallback Linux scanning using ARP/ping (`app/app.py:236`)
- Network filtering supported for custom CIDR ranges