import { computed, toValue, getCurrentInstance, onServerPrefetch, ref, shallowRef, toRef, nextTick, unref } from 'vue';
import { b4 as useNuxtApp, bc as asyncDataDefaults, bd as createError } from './server.mjs';

const DEBOUNCE_DEFAULTS = {
  trailing: true
};
function debounce(fn, wait = 25, options = {}) {
  options = { ...DEBOUNCE_DEFAULTS, ...options };
  if (!Number.isFinite(wait)) {
    throw new TypeError("Expected `wait` to be a finite number");
  }
  let leadingValue;
  let timeout;
  let resolveList = [];
  let currentPromise;
  let trailingArgs;
  const applyFn = (_this, args) => {
    currentPromise = _applyPromised(fn, _this, args);
    currentPromise.finally(() => {
      currentPromise = null;
      if (options.trailing && trailingArgs && !timeout) {
        const promise = applyFn(_this, trailingArgs);
        trailingArgs = null;
        return promise;
      }
    });
    return currentPromise;
  };
  return function(...args) {
    if (currentPromise) {
      if (options.trailing) {
        trailingArgs = args;
      }
      return currentPromise;
    }
    return new Promise((resolve) => {
      const shouldCallNow = !timeout && options.leading;
      clearTimeout(timeout);
      timeout = setTimeout(() => {
        timeout = null;
        const promise = options.leading ? leadingValue : applyFn(this, args);
        for (const _resolve of resolveList) {
          _resolve(promise);
        }
        resolveList = [];
      }, wait);
      if (shouldCallNow) {
        leadingValue = applyFn(this, args);
        resolve(leadingValue);
      } else {
        resolveList.push(resolve);
      }
    });
  };
}
async function _applyPromised(fn, _this, args) {
  return await fn.apply(_this, args);
}

function useAsyncData(...args) {
  const autoKey = typeof args[args.length - 1] === "string" ? args.pop() : void 0;
  if (_isAutoKeyNeeded(args[0], args[1])) {
    args.unshift(autoKey);
  }
  let [_key, _handler, options = {}] = args;
  const key = computed(() => toValue(_key));
  if (typeof key.value !== "string") {
    throw new TypeError("[nuxt] [useAsyncData] key must be a string.");
  }
  if (typeof _handler !== "function") {
    throw new TypeError("[nuxt] [useAsyncData] handler must be a function.");
  }
  const nuxtApp = useNuxtApp();
  options.server ??= true;
  options.default ??= getDefault;
  options.getCachedData ??= getDefaultCachedData;
  options.lazy ??= false;
  options.immediate ??= true;
  options.deep ??= asyncDataDefaults.deep;
  options.dedupe ??= "cancel";
  options._functionName || "useAsyncData";
  nuxtApp._asyncData[key.value];
  const initialFetchOptions = { cause: "initial", dedupe: options.dedupe };
  if (!nuxtApp._asyncData[key.value]?._init) {
    initialFetchOptions.cachedData = options.getCachedData(key.value, nuxtApp, { cause: "initial" });
    nuxtApp._asyncData[key.value] = createAsyncData(nuxtApp, key.value, _handler, options, initialFetchOptions.cachedData);
  }
  const asyncData = nuxtApp._asyncData[key.value];
  asyncData._deps++;
  const initialFetch = () => nuxtApp._asyncData[key.value].execute(initialFetchOptions);
  const fetchOnServer = options.server !== false && nuxtApp.payload.serverRendered;
  if (fetchOnServer && options.immediate) {
    const promise = initialFetch();
    if (getCurrentInstance()) {
      onServerPrefetch(() => promise);
    } else {
      nuxtApp.hook("app:created", async () => {
        await promise;
      });
    }
  }
  const asyncReturn = {
    data: writableComputedRef(() => nuxtApp._asyncData[key.value]?.data),
    pending: writableComputedRef(() => nuxtApp._asyncData[key.value]?.pending),
    status: writableComputedRef(() => nuxtApp._asyncData[key.value]?.status),
    error: writableComputedRef(() => nuxtApp._asyncData[key.value]?.error),
    refresh: (...args2) => nuxtApp._asyncData[key.value].execute(...args2),
    execute: (...args2) => nuxtApp._asyncData[key.value].execute(...args2),
    clear: () => clearNuxtDataByKey(nuxtApp, key.value)
  };
  const asyncDataPromise = Promise.resolve(nuxtApp._asyncDataPromises[key.value]).then(() => asyncReturn);
  Object.assign(asyncDataPromise, asyncReturn);
  return asyncDataPromise;
}
function writableComputedRef(getter) {
  return computed({
    get() {
      return getter()?.value;
    },
    set(value) {
      const ref2 = getter();
      if (ref2) {
        ref2.value = value;
      }
    }
  });
}
function _isAutoKeyNeeded(keyOrFetcher, fetcher) {
  if (typeof keyOrFetcher === "string") {
    return false;
  }
  if (typeof keyOrFetcher === "object" && keyOrFetcher !== null) {
    return false;
  }
  if (typeof keyOrFetcher === "function" && typeof fetcher === "function") {
    return false;
  }
  return true;
}
function clearNuxtDataByKey(nuxtApp, key) {
  if (key in nuxtApp.payload.data) {
    nuxtApp.payload.data[key] = void 0;
  }
  if (key in nuxtApp.payload._errors) {
    nuxtApp.payload._errors[key] = void 0;
  }
  if (nuxtApp._asyncData[key]) {
    nuxtApp._asyncData[key].data.value = unref(nuxtApp._asyncData[key]._default());
    nuxtApp._asyncData[key].error.value = void 0;
    nuxtApp._asyncData[key].status.value = "idle";
  }
  if (key in nuxtApp._asyncDataPromises) {
    if (nuxtApp._asyncDataPromises[key]) {
      nuxtApp._asyncDataPromises[key].cancelled = true;
    }
    nuxtApp._asyncDataPromises[key] = void 0;
  }
}
function pick(obj, keys) {
  const newObj = {};
  for (const key of keys) {
    newObj[key] = obj[key];
  }
  return newObj;
}
function createAsyncData(nuxtApp, key, _handler, options, initialCachedData) {
  nuxtApp.payload._errors[key] ??= void 0;
  const hasCustomGetCachedData = options.getCachedData !== getDefaultCachedData;
  const handler = _handler ;
  const _ref = options.deep ? ref : shallowRef;
  const hasCachedData = initialCachedData !== void 0;
  const unsubRefreshAsyncData = nuxtApp.hook("app:data:refresh", async (keys) => {
    if (!keys || keys.includes(key)) {
      await asyncData.execute({ cause: "refresh:hook" });
    }
  });
  const asyncData = {
    data: _ref(hasCachedData ? initialCachedData : options.default()),
    pending: computed(() => asyncData.status.value === "pending"),
    error: toRef(nuxtApp.payload._errors, key),
    status: shallowRef("idle"),
    execute: (...args) => {
      const [_opts, newValue = void 0] = args;
      const opts = _opts && newValue === void 0 && typeof _opts === "object" ? _opts : {};
      if (nuxtApp._asyncDataPromises[key]) {
        if ((opts.dedupe ?? options.dedupe) === "defer") {
          return nuxtApp._asyncDataPromises[key];
        }
        nuxtApp._asyncDataPromises[key].cancelled = true;
      }
      {
        const cachedData = "cachedData" in opts ? opts.cachedData : options.getCachedData(key, nuxtApp, { cause: opts.cause ?? "refresh:manual" });
        if (cachedData !== void 0) {
          nuxtApp.payload.data[key] = asyncData.data.value = cachedData;
          asyncData.error.value = void 0;
          asyncData.status.value = "success";
          return Promise.resolve(cachedData);
        }
      }
      asyncData.status.value = "pending";
      const promise = new Promise(
        (resolve, reject) => {
          try {
            resolve(handler(nuxtApp));
          } catch (err) {
            reject(err);
          }
        }
      ).then(async (_result) => {
        if (promise.cancelled) {
          return nuxtApp._asyncDataPromises[key];
        }
        let result = _result;
        if (options.transform) {
          result = await options.transform(_result);
        }
        if (options.pick) {
          result = pick(result, options.pick);
        }
        nuxtApp.payload.data[key] = result;
        asyncData.data.value = result;
        asyncData.error.value = void 0;
        asyncData.status.value = "success";
      }).catch((error) => {
        if (promise.cancelled) {
          return nuxtApp._asyncDataPromises[key];
        }
        asyncData.error.value = createError(error);
        asyncData.data.value = unref(options.default());
        asyncData.status.value = "error";
      }).finally(() => {
        if (promise.cancelled) {
          return;
        }
        delete nuxtApp._asyncDataPromises[key];
      });
      nuxtApp._asyncDataPromises[key] = promise;
      return nuxtApp._asyncDataPromises[key];
    },
    _execute: debounce((...args) => asyncData.execute(...args), 0, { leading: true }),
    _default: options.default,
    _deps: 0,
    _init: true,
    _hash: void 0,
    _off: () => {
      unsubRefreshAsyncData();
      if (nuxtApp._asyncData[key]?._init) {
        nuxtApp._asyncData[key]._init = false;
      }
      if (!hasCustomGetCachedData) {
        nextTick(() => {
          if (!nuxtApp._asyncData[key]?._init) {
            clearNuxtDataByKey(nuxtApp, key);
            asyncData.execute = () => Promise.resolve();
          }
        });
      }
    }
  };
  return asyncData;
}
const getDefault = () => void 0;
const getDefaultCachedData = (key, nuxtApp, ctx) => {
  if (nuxtApp.isHydrating) {
    return nuxtApp.payload.data[key];
  }
  if (ctx.cause !== "refresh:manual" && ctx.cause !== "refresh:hook") {
    return nuxtApp.static.data[key];
  }
};

export { useAsyncData as u };
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