adabraka-gpui 0.4.0

use windows::Win32::{
    Foundation::{CloseHandle, MAX_PATH},
    System::Threading::{
        OpenProcess, QueryFullProcessImageNameW, PROCESS_NAME_FORMAT,
        PROCESS_QUERY_LIMITED_INFORMATION,
    },
    UI::WindowsAndMessaging::{GetForegroundWindow, GetWindowTextW, GetWindowThreadProcessId},
};

use crate::FocusedWindowInfo;

pub(crate) fn get_focused_window_info() -> Option<FocusedWindowInfo> {
    unsafe {
        let hwnd = GetForegroundWindow();
        if hwnd.is_invalid() {
            return None;
        }

        let mut title_buf = [0u16; 512];
        let title_len = GetWindowTextW(hwnd, &mut title_buf);
        let window_title = if title_len > 0 {
            String::from_utf16_lossy(&title_buf[..title_len as usize])
        } else {
            String::new()
        };

        let mut process_id: u32 = 0;
        GetWindowThreadProcessId(hwnd, Some(&mut process_id));

        let app_name = get_process_name(process_id).unwrap_or_default();

        Some(FocusedWindowInfo {
            app_name,
            window_title,
            bundle_id: None,
            pid: Some(process_id),
        })
    }
}

fn get_process_name(pid: u32) -> Option<String> {
    unsafe {
        let handle = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, pid).ok()?;
        let mut buf = [0u16; MAX_PATH as usize];
        let mut size = buf.len() as u32;
        let result =
            QueryFullProcessImageNameW(handle, PROCESS_NAME_FORMAT(0), &mut buf, &mut size);
        let _ = CloseHandle(handle);
        result.ok()?;

        let full_path = String::from_utf16_lossy(&buf[..size as usize]);
        let file_name = full_path
            .rsplit('\\')
            .next()
            .unwrap_or(&full_path)
            .to_string();
        Some(file_name)
    }
}