import { isReactive, isReadonly, computed, unref, ref, watch, isRef, reactive, nextTick, inject, provide, getCurrentInstance, onBeforeMount, onBeforeUnmount } from 'vue-demi';

function ownKeys(object, enumerableOnly) {
  var keys = Object.keys(object);

  if (Object.getOwnPropertySymbols) {
    var symbols = Object.getOwnPropertySymbols(object);
    enumerableOnly && (symbols = symbols.filter(function (sym) {
      return Object.getOwnPropertyDescriptor(object, sym).enumerable;
    })), keys.push.apply(keys, symbols);
  }

  return keys;
}

function _objectSpread2(target) {
  for (var i = 1; i < arguments.length; i++) {
    var source = null != arguments[i] ? arguments[i] : {};
    i % 2 ? ownKeys(Object(source), !0).forEach(function (key) {
      _defineProperty(target, key, source[key]);
    }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) {
      Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key));
    });
  }

  return target;
}

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, {
      value: value,
      enumerable: true,
      configurable: true,
      writable: true
    });
  } else {
    obj[key] = value;
  }

  return obj;
}

function unwrapObj(obj) {
  let ignoreKeys = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
  return Object.keys(obj).reduce((o, k) => {
    if (ignoreKeys.includes(k)) return o;
    o[k] = unref(obj[k]);
    return o;
  }, {});
}
function isFunction(val) {
  return typeof val === 'function';
}
function isProxy(value) {
  return isReactive(value) || isReadonly(value);
}
function get(obj, stringPath, def) {
  let current = obj;
  const path = stringPath.split('.');

  for (let i = 0; i < path.length; i++) {
    if (!current[path[i]]) return def;
    current = current[path[i]];
  }

  return current;
}
function gatherBooleanGroupProperties(group, nestedResults, property) {
  return computed(() => {
    return group.some(path => {
      return get(nestedResults, path, {
        [property]: false
      })[property];
    });
  });
}
function gatherArrayGroupProperties(group, nestedResults, property) {
  return computed(() => {
    return group.reduce((all, path) => {
      const fetchedProperty = get(nestedResults, path, {
        [property]: false
      })[property] || [];
      return all.concat(fetchedProperty);
    }, []);
  });
}

function callRule(rule, value, siblingState, instance) {
  return rule.call(instance, unref(value), unref(siblingState), instance);
}

function normalizeValidatorResponse(result) {
  return result.$valid !== undefined ? !result.$valid : !result;
}

function createAsyncResult(rule, model, $pending, $dirty, _ref, $response, instance) {
  let {
    $lazy,
    $rewardEarly
  } = _ref;
  let watchTargets = arguments.length > 7 && arguments[7] !== undefined ? arguments[7] : [];
  let siblingState = arguments.length > 8 ? arguments[8] : undefined;
  let $lastInvalidState = arguments.length > 9 ? arguments[9] : undefined;
  let $lastCommittedOn = arguments.length > 10 ? arguments[10] : undefined;
  const $invalid = ref(!!$dirty.value);
  const $pendingCounter = ref(0);
  $pending.value = false;
  const $unwatch = watch([model, $dirty].concat(watchTargets, $lastCommittedOn), () => {
    if ($lazy && !$dirty.value || $rewardEarly && !$lastInvalidState.value && !$pending.value) {
      return;
    }

    let ruleResult;

    try {
      ruleResult = callRule(rule, model, siblingState, instance);
    } catch (err) {
      ruleResult = Promise.reject(err);
    }

    $pendingCounter.value++;
    $pending.value = !!$pendingCounter.value;
    $invalid.value = false;
    Promise.resolve(ruleResult).then(data => {
      $pendingCounter.value--;
      $pending.value = !!$pendingCounter.value;
      $response.value = data;
      $invalid.value = normalizeValidatorResponse(data);
    }).catch(error => {
      $pendingCounter.value--;
      $pending.value = !!$pendingCounter.value;
      $response.value = error;
      $invalid.value = true;
    });
  }, {
    immediate: true,
    deep: typeof model === 'object'
  });
  return {
    $invalid,
    $unwatch
  };
}

function createSyncResult(rule, model, $dirty, _ref2, $response, instance, siblingState, $lastInvalidState) {
  let {
    $lazy,
    $rewardEarly
  } = _ref2;

  const $unwatch = () => ({});

  const $invalid = computed(() => {
    if ($lazy && !$dirty.value || $rewardEarly && !$lastInvalidState.value) {
      return false;
    }

    let returnValue = true;

    try {
      const result = callRule(rule, model, siblingState, instance);
      $response.value = result;
      returnValue = normalizeValidatorResponse(result);
    } catch (err) {
      $response.value = err;
    }

    return returnValue;
  });
  return {
    $unwatch,
    $invalid
  };
}

function createValidatorResult(rule, model, $dirty, config, instance, validatorName, propertyKey, propertyPath, siblingState, $lastInvalidState, $lastCommittedOn) {
  const $pending = ref(false);
  const $params = rule.$params || {};
  const $response = ref(null);
  let $invalid;
  let $unwatch;

  if (rule.$async) {
    ({
      $invalid,
      $unwatch
    } = createAsyncResult(rule.$validator, model, $pending, $dirty, config, $response, instance, rule.$watchTargets, siblingState, $lastInvalidState, $lastCommittedOn));
  } else {
    ({
      $invalid,
      $unwatch
    } = createSyncResult(rule.$validator, model, $dirty, config, $response, instance, siblingState, $lastInvalidState));
  }

  const message = rule.$message;
  const $message = isFunction(message) ? computed(() => message(unwrapObj({
    $pending,
    $invalid,
    $params: unwrapObj($params),
    $model: model,
    $response,
    $validator: validatorName,
    $propertyPath: propertyPath,
    $property: propertyKey
  }))) : message || '';
  return {
    $message,
    $params,
    $pending,
    $invalid,
    $response,
    $unwatch
  };
}

function sortValidations() {
  let validationsRaw = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};
  const validations = unref(validationsRaw);
  const validationKeys = Object.keys(validations);
  const rules = {};
  const nestedValidators = {};
  const config = {};
  let validationGroups = null;
  validationKeys.forEach(key => {
    const v = validations[key];

    switch (true) {
      case isFunction(v.$validator):
        rules[key] = v;
        break;

      case isFunction(v):
        rules[key] = {
          $validator: v
        };
        break;

      case key === '$validationGroups':
        validationGroups = v;
        break;

      case key.startsWith('$'):
        config[key] = v;
        break;

      default:
        nestedValidators[key] = v;
    }
  });
  return {
    rules,
    nestedValidators,
    config,
    validationGroups
  };
}

const ROOT_PATH = '__root';

function createValidationResults(rules, model, key, resultsCache, path, config, instance, externalResults, siblingState) {
  const ruleKeys = Object.keys(rules);
  const cachedResult = resultsCache.get(path, rules);
  const $dirty = ref(false);
  const $lastInvalidState = ref(false);
  const $lastCommittedOn = ref(0);

  if (cachedResult) {
    if (!cachedResult.$partial) return cachedResult;
    cachedResult.$unwatch();
    $dirty.value = cachedResult.$dirty.value;
  }

  const result = {
    $dirty,
    $path: path,
    $touch: () => {
      if (!$dirty.value) $dirty.value = true;
    },
    $reset: () => {
      if ($dirty.value) $dirty.value = false;
    },
    $commit: () => {}
  };

  if (!ruleKeys.length) {
    cachedResult && resultsCache.set(path, rules, result);
    return result;
  }

  ruleKeys.forEach(ruleKey => {
    result[ruleKey] = createValidatorResult(rules[ruleKey], model, result.$dirty, config, instance, ruleKey, key, path, siblingState, $lastInvalidState, $lastCommittedOn);
  });
  result.$externalResults = computed(() => {
    if (!externalResults.value) return [];
    return [].concat(externalResults.value).map((stringError, index) => ({
      $propertyPath: path,
      $property: key,
      $validator: '$externalResults',
      $uid: `${path}-externalResult-${index}`,
      $message: stringError,
      $params: {},
      $response: null,
      $pending: false
    }));
  });
  result.$invalid = computed(() => {
    const r = ruleKeys.some(ruleKey => unref(result[ruleKey].$invalid));
    $lastInvalidState.value = r;
    return !!result.$externalResults.value.length || r;
  });
  result.$pending = computed(() => ruleKeys.some(ruleKey => unref(result[ruleKey].$pending)));
  result.$error = computed(() => result.$dirty.value ? result.$pending.value || result.$invalid.value : false);
  result.$silentErrors = computed(() => ruleKeys.filter(ruleKey => unref(result[ruleKey].$invalid)).map(ruleKey => {
    const res = result[ruleKey];
    return reactive({
      $propertyPath: path,
      $property: key,
      $validator: ruleKey,
      $uid: `${path}-${ruleKey}`,
      $message: res.$message,
      $params: res.$params,
      $response: res.$response,
      $pending: res.$pending
    });
  }).concat(result.$externalResults.value));
  result.$errors = computed(() => result.$dirty.value ? result.$silentErrors.value : []);

  result.$unwatch = () => ruleKeys.forEach(ruleKey => {
    result[ruleKey].$unwatch();
  });

  result.$commit = () => {
    $lastInvalidState.value = true;
    $lastCommittedOn.value = Date.now();
  };

  resultsCache.set(path, rules, result);
  return result;
}

function collectNestedValidationResults(validations, nestedState, path, resultsCache, config, instance, nestedExternalResults) {
  const nestedValidationKeys = Object.keys(validations);
  if (!nestedValidationKeys.length) return {};
  return nestedValidationKeys.reduce((results, nestedKey) => {
    results[nestedKey] = setValidations({
      validations: validations[nestedKey],
      state: nestedState,
      key: nestedKey,
      parentKey: path,
      resultsCache,
      globalConfig: config,
      instance,
      externalResults: nestedExternalResults
    });
    return results;
  }, {});
}

function createMetaFields(results, nestedResults, childResults) {
  const allResults = computed(() => [nestedResults, childResults].filter(res => res).reduce((allRes, res) => {
    return allRes.concat(Object.values(unref(res)));
  }, []));
  const $dirty = computed({
    get() {
      return results.$dirty.value || (allResults.value.length ? allResults.value.every(r => r.$dirty) : false);
    },

    set(v) {
      results.$dirty.value = v;
    }

  });
  const $silentErrors = computed(() => {
    const modelErrors = unref(results.$silentErrors) || [];
    const nestedErrors = allResults.value.filter(result => (unref(result).$silentErrors || []).length).reduce((errors, result) => {
      return errors.concat(...result.$silentErrors);
    }, []);
    return modelErrors.concat(nestedErrors);
  });
  const $errors = computed(() => {
    const modelErrors = unref(results.$errors) || [];
    const nestedErrors = allResults.value.filter(result => (unref(result).$errors || []).length).reduce((errors, result) => {
      return errors.concat(...result.$errors);
    }, []);
    return modelErrors.concat(nestedErrors);
  });
  const $invalid = computed(() => allResults.value.some(r => r.$invalid) || unref(results.$invalid) || false);
  const $pending = computed(() => allResults.value.some(r => unref(r.$pending)) || unref(results.$pending) || false);
  const $anyDirty = computed(() => allResults.value.some(r => r.$dirty) || allResults.value.some(r => r.$anyDirty) || $dirty.value);
  const $error = computed(() => $dirty.value ? $pending.value || $invalid.value : false);

  const $touch = () => {
    results.$touch();
    allResults.value.forEach(result => {
      result.$touch();
    });
  };

  const $commit = () => {
    results.$commit();
    allResults.value.forEach(result => {
      result.$commit();
    });
  };

  const $reset = () => {
    results.$reset();
    allResults.value.forEach(result => {
      result.$reset();
    });
  };

  if (allResults.value.length && allResults.value.every(nr => nr.$dirty)) $touch();
  return {
    $dirty,
    $errors,
    $invalid,
    $anyDirty,
    $error,
    $pending,
    $touch,
    $reset,
    $silentErrors,
    $commit
  };
}

function setValidations(_ref) {
  let {
    validations,
    state,
    key,
    parentKey,
    childResults,
    resultsCache,
    globalConfig = {},
    instance,
    externalResults
  } = _ref;
  const path = parentKey ? `${parentKey}.${key}` : key;
  const {
    rules,
    nestedValidators,
    config,
    validationGroups
  } = sortValidations(validations);

  const mergedConfig = _objectSpread2(_objectSpread2({}, globalConfig), config);

  const nestedState = key ? computed(() => {
    const s = unref(state);
    return s ? unref(s[key]) : undefined;
  }) : state;

  const cachedExternalResults = _objectSpread2({}, unref(externalResults) || {});

  const nestedExternalResults = computed(() => {
    const results = unref(externalResults);
    if (!key) return results;
    return results ? unref(results[key]) : undefined;
  });
  const results = createValidationResults(rules, nestedState, key, resultsCache, path, mergedConfig, instance, nestedExternalResults, state);
  const nestedResults = collectNestedValidationResults(nestedValidators, nestedState, path, resultsCache, mergedConfig, instance, nestedExternalResults);
  const $validationGroups = {};

  if (validationGroups) {
    Object.entries(validationGroups).forEach(_ref2 => {
      let [key, group] = _ref2;
      $validationGroups[key] = {
        $invalid: gatherBooleanGroupProperties(group, nestedResults, '$invalid'),
        $error: gatherBooleanGroupProperties(group, nestedResults, '$error'),
        $pending: gatherBooleanGroupProperties(group, nestedResults, '$pending'),
        $errors: gatherArrayGroupProperties(group, nestedResults, '$errors'),
        $silentErrors: gatherArrayGroupProperties(group, nestedResults, '$silentErrors')
      };
    });
  }

  const {
    $dirty,
    $errors,
    $invalid,
    $anyDirty,
    $error,
    $pending,
    $touch,
    $reset,
    $silentErrors,
    $commit
  } = createMetaFields(results, nestedResults, childResults);
  const $model = key ? computed({
    get: () => unref(nestedState),
    set: val => {
      $dirty.value = true;
      const s = unref(state);
      const external = unref(externalResults);

      if (external) {
        external[key] = cachedExternalResults[key];
      }

      if (isRef(s[key])) {
        s[key].value = val;
      } else {
        s[key] = val;
      }
    }
  }) : null;

  if (key && mergedConfig.$autoDirty) {
    watch(nestedState, () => {
      if (!$dirty.value) $touch();
      const external = unref(externalResults);

      if (external) {
        external[key] = cachedExternalResults[key];
      }
    }, {
      flush: 'sync'
    });
  }

  async function $validate() {
    $touch();

    if (mergedConfig.$rewardEarly) {
      $commit();
      await nextTick();
    }

    await nextTick();
    return new Promise(resolve => {
      if (!$pending.value) return resolve(!$invalid.value);
      const unwatch = watch($pending, () => {
        resolve(!$invalid.value);
        unwatch();
      });
    });
  }

  function $getResultsForChild(key) {
    return (childResults.value || {})[key];
  }

  function $clearExternalResults() {
    if (isRef(externalResults)) {
      externalResults.value = cachedExternalResults;
    } else {
      if (Object.keys(cachedExternalResults).length === 0) {
        Object.keys(externalResults).forEach(k => {
          delete externalResults[k];
        });
      } else {
        Object.assign(externalResults, cachedExternalResults);
      }
    }
  }

  return reactive(_objectSpread2(_objectSpread2(_objectSpread2({}, results), {}, {
    $model,
    $dirty,
    $error,
    $errors,
    $invalid,
    $anyDirty,
    $pending,
    $touch,
    $reset,
    $path: path || ROOT_PATH,
    $silentErrors,
    $validate,
    $commit
  }, childResults && {
    $getResultsForChild,
    $clearExternalResults,
    $validationGroups
  }), nestedResults));
}

class ResultsStorage {
  constructor() {
    this.storage = new Map();
  }

  set(path, rules, result) {
    this.storage.set(path, {
      rules,
      result
    });
  }

  checkRulesValidity(path, rules, storedRules) {
    const storedRulesKeys = Object.keys(storedRules);
    const newRulesKeys = Object.keys(rules);
    if (newRulesKeys.length !== storedRulesKeys.length) return false;
    const hasAllValidators = newRulesKeys.every(ruleKey => storedRulesKeys.includes(ruleKey));
    if (!hasAllValidators) return false;
    return newRulesKeys.every(ruleKey => {
      if (!rules[ruleKey].$params) return true;
      return Object.keys(rules[ruleKey].$params).every(paramKey => {
        return unref(storedRules[ruleKey].$params[paramKey]) === unref(rules[ruleKey].$params[paramKey]);
      });
    });
  }

  get(path, rules) {
    const storedRuleResultPair = this.storage.get(path);
    if (!storedRuleResultPair) return undefined;
    const {
      rules: storedRules,
      result
    } = storedRuleResultPair;
    const isValidCache = this.checkRulesValidity(path, rules, storedRules);
    const $unwatch = result.$unwatch ? result.$unwatch : () => ({});
    if (!isValidCache) return {
      $dirty: result.$dirty,
      $partial: true,
      $unwatch
    };
    return result;
  }

}

const CollectFlag = {
  COLLECT_ALL: true,
  COLLECT_NONE: false
};
const VuelidateInjectChildResults = Symbol('vuelidate#injectChildResults');
const VuelidateRemoveChildResults = Symbol('vuelidate#removeChildResults');
function nestedValidations(_ref) {
  let {
    $scope,
    instance
  } = _ref;
  const childResultsRaw = {};
  const childResultsKeys = ref([]);
  const childResults = computed(() => childResultsKeys.value.reduce((results, key) => {
    results[key] = unref(childResultsRaw[key]);
    return results;
  }, {}));

  function injectChildResultsIntoParent(results, _ref2) {
    let {
      $registerAs: key,
      $scope: childScope,
      $stopPropagation
    } = _ref2;
    if ($stopPropagation || $scope === CollectFlag.COLLECT_NONE || childScope === CollectFlag.COLLECT_NONE || $scope !== CollectFlag.COLLECT_ALL && $scope !== childScope) return;
    childResultsRaw[key] = results;
    childResultsKeys.value.push(key);
  }

  instance.__vuelidateInjectInstances = [].concat(instance.__vuelidateInjectInstances || [], injectChildResultsIntoParent);

  function removeChildResultsFromParent(key) {
    childResultsKeys.value = childResultsKeys.value.filter(childKey => childKey !== key);
    delete childResultsRaw[key];
  }

  instance.__vuelidateRemoveInstances = [].concat(instance.__vuelidateRemoveInstances || [], removeChildResultsFromParent);
  const sendValidationResultsToParent = inject(VuelidateInjectChildResults, []);
  provide(VuelidateInjectChildResults, instance.__vuelidateInjectInstances);
  const removeValidationResultsFromParent = inject(VuelidateRemoveChildResults, []);
  provide(VuelidateRemoveChildResults, instance.__vuelidateRemoveInstances);
  return {
    childResults,
    sendValidationResultsToParent,
    removeValidationResultsFromParent
  };
}

function ComputedProxyFactory(target) {
  return new Proxy(target, {
    get(target, prop) {
      return typeof target[prop] === 'object' ? ComputedProxyFactory(target[prop]) : computed(() => target[prop]);
    }

  });
}

let uid = 0;
function useVuelidate(validations, state) {
  var _getCurrentInstance;

  let globalConfig = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {};

  if (arguments.length === 1) {
    globalConfig = validations;
    validations = undefined;
    state = undefined;
  }

  let {
    $registerAs,
    $scope = CollectFlag.COLLECT_ALL,
    $stopPropagation,
    $externalResults,
    currentVueInstance
  } = globalConfig;
  const instance = currentVueInstance || ((_getCurrentInstance = getCurrentInstance()) === null || _getCurrentInstance === void 0 ? void 0 : _getCurrentInstance.proxy);
  const componentOptions = instance ? instance.$options : {};

  if (!$registerAs) {
    uid += 1;
    $registerAs = `_vuelidate_${uid}`;
  }

  const validationResults = ref({});
  const resultsCache = new ResultsStorage();
  const {
    childResults,
    sendValidationResultsToParent,
    removeValidationResultsFromParent
  } = instance ? nestedValidations({
    $scope,
    instance
  }) : {
    childResults: ref({})
  };

  if (!validations && componentOptions.validations) {
    const rules = componentOptions.validations;
    state = ref({});
    onBeforeMount(() => {
      state.value = instance;
      watch(() => isFunction(rules) ? rules.call(state.value, new ComputedProxyFactory(state.value)) : rules, validations => {
        validationResults.value = setValidations({
          validations,
          state,
          childResults,
          resultsCache,
          globalConfig,
          instance,
          externalResults: $externalResults || instance.vuelidateExternalResults
        });
      }, {
        immediate: true
      });
    });
    globalConfig = componentOptions.validationsConfig || globalConfig;
  } else {
    const validationsWatchTarget = isRef(validations) || isProxy(validations) ? validations : reactive(validations || {});
    watch(validationsWatchTarget, newValidationRules => {
      validationResults.value = setValidations({
        validations: newValidationRules,
        state,
        childResults,
        resultsCache,
        globalConfig,
        instance: instance !== null && instance !== void 0 ? instance : {},
        externalResults: $externalResults
      });
    }, {
      immediate: true
    });
  }

  if (instance) {
    sendValidationResultsToParent.forEach(f => f(validationResults, {
      $registerAs,
      $scope,
      $stopPropagation
    }));
    onBeforeUnmount(() => removeValidationResultsFromParent.forEach(f => f($registerAs)));
  }

  return computed(() => {
    return _objectSpread2(_objectSpread2({}, unref(validationResults.value)), childResults.value);
  });
}

export { CollectFlag, useVuelidate as default, useVuelidate };