// 加载第三方库
export const loadLib = (() => {
  const cache: Record<string, Promise<void>> = {};

  const load = (
    lib: string,
    success: () => void,
    err: () => void,
    maxReq = 0
  ) => {
    const el = document.createElement("script");
    el.src = lib;
    document.body.appendChild(el);
    el.onload = success;
    el.onerror = () => {
      if (maxReq > 0) {
        load(lib, success, err, --maxReq);
      } else {
        err();
      }
    };
  };

  return (lib: string) => {
    if (!cache[lib]) {
      cache[lib] = new Promise((resolve, reject) => {
        load(lib, resolve, reject, 3);
      });
    }
    return cache[lib];
  };
})();

export const togetherCallback = (cbs: (() => void)[]) => () => together(cbs)

export const together = (cbs: (() => void)[]) => {
  cbs.forEach(cb => cb())
}

export const getFileUrl = (file: LocalFile | string) => 
  typeof file === 'string'
    ? file
    : file.url


export const asyncTimeout = (mis: number = 0) => new Promise(resolve => setTimeout(resolve, mis))


export const jsonToForm = (data: { [key in string]: any }) => {
  const formData = new FormData()
  for (const [key, val] of Object.entries(data)) {
    formData.append(key, val)
  }
  return formData
}



export * from './store-help'
export * from "./stack";
export * from "./loading";
export * from "./route";
export * from "./asyncBus";
export * from './mount'
export * from './watch'
export * from './diff'
export * from './params'