import { Readable } from "node:stream";

const objType = (obj) => {
  if (obj === null) {
    return 'null'
  }
  if (Array.isArray(obj)) {
    return 'array'
  }

  return typeof obj
}

function* gronGenerator(obj, root = `json`) {
  switch (objType(obj)) {
    case 'object':
      yield `${root}={};\n`;
      for (const key in obj) {
        yield* gronGenerator(obj[key], `${root}.${key}`);
      }
      break;
    case 'array':
      yield `${root}=[];\n`;
      for (let i = 0; i < obj.length; i++) {
        yield* gronGenerator(obj[i], `${root}[${i}]`);
      }
      break;

    default:
      yield `${root}=${JSON.stringify(obj)};\n`;

  }
}

export const gronReadStream = (obj) => {

  return Readable.from(gronGenerator(obj));

}