import { ref, toRef, getCurrentInstance, onServerPrefetch, unref } from 'vue';
import { m as useNuxtApp, c as createError } from '../server.mjs';

const getDefault = () => null;
function useAsyncData(...args) {
  var _a;
  const autoKey = typeof args[args.length - 1] === "string" ? args.pop() : void 0;
  if (typeof args[0] !== "string") {
    args.unshift(autoKey);
  }
  let [key, handler, options = {}] = args;
  if (typeof key !== "string") {
    throw new TypeError("[nuxt] [asyncData] key must be a string.");
  }
  if (typeof handler !== "function") {
    throw new TypeError("[nuxt] [asyncData] handler must be a function.");
  }
  options.server = options.server ?? true;
  options.default = options.default ?? getDefault;
  options.lazy = options.lazy ?? false;
  options.immediate = options.immediate ?? true;
  const nuxt = useNuxtApp();
  const getCachedData = () => nuxt.isHydrating ? nuxt.payload.data[key] : nuxt.static.data[key];
  const hasCachedData = () => getCachedData() !== void 0;
  if (!nuxt._asyncData[key]) {
    nuxt._asyncData[key] = {
      data: ref(getCachedData() ?? ((_a = options.default) == null ? void 0 : _a.call(options)) ?? null),
      pending: ref(!hasCachedData()),
      error: toRef(nuxt.payload._errors, key)
    };
  }
  const asyncData = { ...nuxt._asyncData[key] };
  asyncData.refresh = asyncData.execute = (opts = {}) => {
    if (nuxt._asyncDataPromises[key]) {
      if (opts.dedupe === false) {
        return nuxt._asyncDataPromises[key];
      }
      nuxt._asyncDataPromises[key].cancelled = true;
    }
    if (opts._initial && hasCachedData()) {
      return getCachedData();
    }
    asyncData.pending.value = true;
    const promise = new Promise(
      (resolve, reject) => {
        try {
          resolve(handler(nuxt));
        } catch (err) {
          reject(err);
        }
      }
    ).then((_result) => {
      if (promise.cancelled) {
        return nuxt._asyncDataPromises[key];
      }
      let result = _result;
      if (options.transform) {
        result = options.transform(_result);
      }
      if (options.pick) {
        result = pick(result, options.pick);
      }
      asyncData.data.value = result;
      asyncData.error.value = null;
    }).catch((error) => {
      var _a2;
      if (promise.cancelled) {
        return nuxt._asyncDataPromises[key];
      }
      asyncData.error.value = error;
      asyncData.data.value = unref(((_a2 = options.default) == null ? void 0 : _a2.call(options)) ?? null);
    }).finally(() => {
      if (promise.cancelled) {
        return;
      }
      asyncData.pending.value = false;
      nuxt.payload.data[key] = asyncData.data.value;
      if (asyncData.error.value) {
        nuxt.payload._errors[key] = createError(asyncData.error.value);
      }
      delete nuxt._asyncDataPromises[key];
    });
    nuxt._asyncDataPromises[key] = promise;
    return nuxt._asyncDataPromises[key];
  };
  const initialFetch = () => asyncData.refresh({ _initial: true });
  const fetchOnServer = options.server !== false && nuxt.payload.serverRendered;
  if (fetchOnServer && options.immediate) {
    const promise = initialFetch();
    if (getCurrentInstance()) {
      onServerPrefetch(() => promise);
    } else {
      nuxt.hook("app:created", () => promise);
    }
  }
  const asyncDataPromise = Promise.resolve(nuxt._asyncDataPromises[key]).then(() => asyncData);
  Object.assign(asyncDataPromise, asyncData);
  return asyncDataPromise;
}
function pick(obj, keys) {
  const newObj = {};
  for (const key of keys) {
    newObj[key] = obj[key];
  }
  return newObj;
}

export { useAsyncData as u };
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