# CLAUDE.md

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

## Purpose

FocusFix is a Windows utility that forces a game window into the foreground after launch. Works with **Steam** (directly via `%command%`) and **Sunshine/Moonlight** (manual `--process` argument).

## Architecture

- **`focusfix.py`** — Python script that supports two modes: `--process Name` for monitoring an already-known process, or direct Steam wrapper mode where `%command%` is passed as positional arguments. In wrapper mode it derives the process name from the target executable, launches the game itself, then polls for the game process, waits for its main window (filtered by size to skip splash screens, preferring windows with titles over titleless overlays), waits for the window size to stabilize, then brings the game window to foreground using Win32 API workarounds (`AttachThreadInput` + `Alt` key simulation to bypass `SetForegroundWindow` restrictions). Monitors for window changes (splash → main window) and re-focuses automatically. Retries up to 15 times. Runtime logging goes to `focusfix.log`.
- **`launch.vbs`** — Legacy Steam wrapper. No longer required for normal usage, but still present in the repository.

## Setup

```
py -m venv .venv
.venv\Scripts\activate
pip install psutil pywin32
```

## Steam Launch Options

```
"C:\Projekte\Steam_backgroud_fix\.venv\Scripts\pythonw.exe" "C:\Projekte\Steam_backgroud_fix\focusfix.py" %command%
```

Same launch option works for all Steam games with similar foreground/focus issues — the process name is extracted automatically.

## Sunshine / Moonlight

Use as command preparation in Sunshine (full venv path required):

```
"C:\Projekte\Steam_backgroud_fix\.venv\Scripts\pythonw.exe" "C:\Projekte\Steam_backgroud_fix\focusfix.py" --process "ProcessName"
```

## Running Manually (for testing)

```
.venv\Scripts\python focusfix.py --process CrimsonDesert
.venv\Scripts\python focusfix.py --process CrimsonDesert --timeout 180
.venv\Scripts\python focusfix.py "C:\Games\CrimsonDesert.exe"
```

Use either `--process` or a game command. Runtime logging goes to `focusfix.log`. When started with `pythonw.exe`, no console window is shown; manual runs with `python.exe` can still print argument or interpreter errors to the console.

## Key Constants in focusfix.py

- `MIN_WINDOW_WIDTH = 800` — distinguishes game window from splash screen
- `FOCUS_RETRIES = 15` / `FOCUS_RETRY_DELAY = 2.0` — retry parameters for foreground focus

## Windows API Notes

- `SetForegroundWindow` is restricted by Windows unless the calling process owns the foreground. Workaround: simulate an `Alt` keypress + `AttachThreadInput` to the foreground thread.
- Alt key release is in a `finally` block to prevent it from staying pressed on errors.
- `pythonw.exe` (not `python.exe`) is required for invisible background execution.
- `launch.vbs` is legacy-only; normal Steam usage now calls `focusfix.py` directly.
- Window selection prefers titled windows over titleless ones (prevents overlay issues like in Wuthering Waves).