import { StringExt } from "../string";

const dataset: WeakMap<Element, Record<string, any>> = new WeakMap();

export function getData(elem: Element, name: string) {
  const key = StringExt.camelCase(name);
  const cache = dataset.get(elem);
  if (cache) {
    return cache[key];
  }
}

export function setData(elem: Element, name: string, value: any) {
  const key = StringExt.camelCase(name);
  const cache = dataset.get(elem);
  if (cache) {
    cache[key] = value;
  } else {
    dataset.set(elem, {
      [key]: value,
    });
  }
}

export function data(elem: Element): Record<string, any> | undefined;
export function data(elem: Element, name: string): any;
export function data(elem: Element, name: string, value: any): void;
export function data(elem: Element, name: Record<string, any>): void;
export function data(
  elem: Element,
  name?: string | Record<string, any>,
  value?: any,
) {
  if (!name) {
    return dataset.get(elem);
  }

  if (typeof name === "string") {
    if (value === undefined) {
      return getData(elem, name);
    }
    setData(elem, name, value);

    return;
  }

  // eslint-disable-next-line
  for (const key in name) {
    data(elem, key, name[key]);
  }
}