export { uuidV4 } from './uuid';

/** 从 url 中取出 query 键值对 */
export function getQuery(href = location.href): Record<string, string> {
  const hrefWithoutHash = href.split('#')[0];
  const query = hrefWithoutHash.includes('?') ? hrefWithoutHash.split('?')[1] : hrefWithoutHash;
  const res = {};
  if (!query.includes('=')) {
    return res;
  }
  for (const pair of query.split('&')) {
    const [key, value] = pair.split('=');
    res[key] = value;
  }
  return res;
}

/** 将 query 键值对转换为 url search 串
 * @example stringifyQuery({ a: 1, b: 2 }) => 'a=1&b=2'
 */
export function stringifyQuery(
  query: Record<string, any>,
  /** 是否将 key 转为 snake_case */
  snakeCaseKey = true,
) {
  return Object.entries(query)
    .filter(([_k, v]) => v !== undefined && v !== null)
    .map(([k, v]) => `${snakeCaseKey ? hump2Underline(k) : k}=${v}`)
    .join('&');
}

/** 将小驼峰转下划线 */
export function hump2Underline(s: string) {
  if (/^[A-Z]/.test(s)) {
    return s;
  }
  return s.replace(/([A-Z])/g, '_$1').toLowerCase();
}

/** 将下划线转小驼峰 */
export function underline2Hump(s: string) {
  if (/^[A-Z]/.test(s)) {
    return s;
  }
  return s.replace(/(_[a-z])/g, (_all, letter) => letter.toUpperCase().slice(1));
}

/** 将对象的下划线 key 都转为小驼峰 */
export function underline2HumpObjectKey(obj: Record<string, any>) {
  if (!(typeof obj === 'object')) {
    return obj;
  }
  return Object.fromEntries(Object.entries(obj).map(([k, v]) => [underline2Hump(k), v]));
}