// SPDX-License-Identifier: MIT

import { readFile } from "node:fs/promises";
import os from "node:os";
import path from "node:path";

export function getConfigDir(moduleName: string): string {
  if (process.platform === "win32") {
    return path.join(process.env.LOCALAPPDATA ?? path.join(os.homedir(), "AppData", "Local"), moduleName);
  }

  return path.join(process.env.XDG_CONFIG_HOME ?? path.join(os.homedir(), ".config"), moduleName);
}

export async function getConfig(moduleName: string, configName = "config"): Promise<unknown> {
  const configPath = path.join(getConfigDir(moduleName), `${configName}.json`);

  return readFile(configPath, "utf8")
    .then((configJson) => JSON.parse(configJson) as unknown)
    .catch((err: unknown) => {
      if ((err as { code?: string } | null)?.code === "ENOENT") {
        return {};
      }

      throw err;
    });
}