// Plugin-tree maintenance for the desktop profile (no Electron imports, so this
// is unit-testable with plain node).
//
// The desktop may configure an operator-selected plugin directory, but it never
// owns the files in that directory. In particular, upgrades must not seed,
// replace, rename, or delete plugins. Plugin installation is an explicit
// operator action (or an external package manager action).
const fs = require("fs");

// ensurePluginDirConfigured back-fills `plugin_dir` into an existing config.
// Appending a top-level YAML key is safe for the shapes this file can have
// (flat mapping + a keys list). Returns "added" | "present" | "absent" | "error".
function ensurePluginDirConfigured(configFile, pluginsDir, log) {
  try {
    if (!fs.existsSync(configFile)) return "absent";
    const cur = fs.readFileSync(configFile, "utf-8");
    if (/^\s*plugin_dir\s*:/m.test(cur)) return "present";
    fs.writeFileSync(
      configFile,
      cur.replace(/\s*$/, "") +
        "\n# added by ModelRouter Desktop: enables the operator plugin directory\n" +
        "plugin_dir: " + JSON.stringify(pluginsDir) + "\n",
      "utf-8",
    );
    if (log) log("[gui] plugin_dir back-filled into " + configFile);
    return "added";
  } catch (e) {
    if (log) log("[gui] ensurePluginDirConfigured failed: " + e.message);
    return "error";
  }
}

module.exports = { ensurePluginDirConfigured };