import type { Context } from "@earendil-works/chord";
import { getOrThrow } from "@earendil-works/pi-durable/env";
import type { Environment } from "@berry/api";

export async function userDirectory(
  env: Environment,
  variable: string,
  fallback: string[],
  context: Context,
): Promise<string> {
  const value = Object.entries(env.variables).find(([name]) =>
    env.platform === "win32" ? name.toUpperCase() === variable : name === variable
  )?.[1];
  return getOrThrow(
    await (value
      ? env.absolutePath(value, context)
      : env.joinPath([env.home, ...fallback], context)),
  );
}