export interface Env {
  [key: string]: Promise<string>;
  <T = string>(name: string, value?: T | undefined, error?: string): Promise<T>;
}

export const env = new Proxy(_env, {
  get: (_, name: string) => _env(name),
  apply: (_, __, args: [string, any?, string?]) => _env(...args),
}) as Env;

async function _env<T = string>(
  name: string,
  value?: T | undefined,
  error?: string
): Promise<T> {
  if (value !== undefined) {
    return value;
  } else if (typeof process !== undefined) {
    // we are in a node environment
    return process.env[name]! as T;
  } else {
    // we are in a browser environment
    try {
      const { env } = await import("cloudflare:workers");
      if (name in env) {
        return env[name as keyof typeof env] as T;
      }
    } catch (error) {}
  }
  throw new Error(error ?? `Environment variable ${name} is not set`);
}