import os from "node:os";
import path from "node:path";
import { pathToFileURL } from "node:url";

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

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

export async function loadConfig(type) {
  const configBaseDir = getUserConfigDir();
  const configType = typeof type === "string" ? type.toLowerCase() : "";
  let configFileName;

  switch (configType) {
    case "public":
    case "p":
      configFileName = "public-config.js";
      break;
    case "confidential":
    case "c":
      configFileName = "confidential-config.js";
      break;
    default:
      configFileName = null;
  }

  if (!configFileName) {
    throw new Error(
      `Invalid config type: ${type}. Expected "public"|"p" or "confidential"|"c".`,
    );
  }

  const configPath = path.join(configBaseDir, "sk-az-tools", configFileName);
  const configUrl = pathToFileURL(configPath).href;
  const { config } = await import(configUrl);
  return config;
}