// cache-dir.mjs — Cross-platform cache directory resolution.
// Windows: %LOCALAPPDATA%/llm-security or %APPDATA%/llm-security
// macOS/Linux: ~/.cache/llm-security (XDG_CACHE_HOME fallback)

import { homedir } from 'node:os';
import { join } from 'node:path';

export function getCacheDir() {
  if (process.platform === 'win32') {
    const localAppData = process.env.LOCALAPPDATA;
    if (localAppData) return join(localAppData, 'llm-security');
    const appData = process.env.APPDATA;
    if (appData) return join(appData, 'llm-security');
    return join(homedir(), '.cache', 'llm-security');
  }
  const xdg = process.env.XDG_CACHE_HOME;
  if (xdg) return join(xdg, 'llm-security');
  return join(homedir(), '.cache', 'llm-security');
}