import { readFile, access } from "node:fs/promises";
import { createJiti } from "jiti";
import { join } from "node:path";
import type { Config } from "./config";
import { isBun } from "std-env";

export const jiti = createJiti(import.meta.url);

export async function exists(path: string | URL) {
  try {
    await access(path);
    return true;
  } catch {
    return false;
  }
}

export async function readJson(path: string | URL) {
  if (isBun) return await Bun.file(path).json();

  return JSON.parse((await readFile(path)).toString());
}

export async function loadConfig() {
  const extensions = [".js", ".ts", ".mjs", ".mts", ".json"];

  let selectedExt: string | undefined = undefined;
  for (const ext of extensions) {
    if (await exists(join(process.cwd(), `/leaflet-md.config${ext}`))) {
      selectedExt = ext;
      break;
    }
  }

  if (!selectedExt) return undefined;

  const configPath = join(process.cwd(), `/leaflet-md.config${selectedExt}`);
  const config = (await jiti.import(configPath, { default: true })) as Config;
  return config;
}