import { promises as fs } from "fs";
import * as os from "os";
import * as path from "path";

const NO_DIR_MESSAGE =
  'read-write: no working directory. Set "Working directory" in the plugin settings, or attach one to the chat.';

/**
 * Decide the scope root. A non-empty setting wins and must be valid (no silent
 * fallback); otherwise the chat's working directory is used.
 */
export async function resolveRoot(
  configured: string,
  getChatDir: () => string,
  homedir: () => string = os.homedir,
): Promise<string> {
  const entered = configured.trim();
  if (entered === "") {
    try {
      return getChatDir();
    } catch {
      throw new Error(NO_DIR_MESSAGE);
    }
  }

  const invalid = () =>
    new Error(
      `read-write: "Working directory" setting must be an absolute path to an existing directory (got: ${configured})`,
    );

  let candidate = entered;
  if (candidate === "~") candidate = homedir();
  else if (candidate.startsWith("~/")) candidate = path.join(homedir(), candidate.slice(2));
  if (!path.isAbsolute(candidate)) throw invalid();

  try {
    const real = await fs.realpath(candidate);
    if (!(await fs.stat(real)).isDirectory()) throw invalid();
    return real;
  } catch {
    throw invalid();
  }
}

import { promises as fs } from "fs";
import * as os from "os";
import * as path from "path";

const NO_DIR_MESSAGE =
  'read-write: no working directory. Set "Working directory" in the plugin settings, or attach one to the chat.';

/**
 * Decide the scope root. A non-empty setting wins and must be valid (no silent
 * fallback); otherwise the chat's working directory is used.
 */
export async function resolveRoot(
  configured: string,
  getChatDir: () => string,
  homedir: () => string = os.homedir,
): Promise<string> {
  const entered = configured.trim();
  if (entered === "") {
    try {
      return getChatDir();
    } catch {
      throw new Error(NO_DIR_MESSAGE);
    }
  }

  const invalid = () =>
    new Error(
      `read-write: "Working directory" setting must be an absolute path to an existing directory (got: ${configured})`,
    );

  let candidate = entered;
  if (candidate === "~") candidate = homedir();
  else if (candidate.startsWith("~/")) candidate = path.join(homedir(), candidate.slice(2));
  if (!path.isAbsolute(candidate)) throw invalid();

  try {
    const real = await fs.realpath(candidate);
    if (!(await fs.stat(real)).isDirectory()) throw invalid();
    return real;
  } catch {
    throw invalid();
  }
}