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/* eslint-disable */

import isEmpty from 'lodash/isEmpty';
import isFunction from 'lodash/isFunction';
import isString from 'lodash/isString';
import invariant from 'invariant';
import conformsTo from 'lodash/conformsTo';

import checkStore from './checkStore';
import { DAEMON, ONCE_TILL_UNMOUNT, RESTART_ON_REMOUNT } from './constants';

const allowedModes = [RESTART_ON_REMOUNT, DAEMON, ONCE_TILL_UNMOUNT];

const checkKey = key =>
  invariant(
    isString(key) && !isEmpty(key),
    '(app/utils...) injectSaga: Expected `key` to be a non empty string'
  );

const checkDescriptor = descriptor => {
  const shape = {
    saga: isFunction,
    mode: mode => isString(mode) && allowedModes.includes(mode),
  };
  invariant(
    conformsTo(descriptor, shape),
    '(app/utils...) injectSaga: Expected a valid saga descriptor'
  );
};

export function injectSagaFactory(store, isValid) {
  return function injectSaga(key, descriptor = {}, args) {
    if (!isValid) checkStore(store);

const newDescriptor = {
      ...descriptor,
      mode: descriptor.mode || RESTART_ON_REMOUNT,
    };
    const { saga, mode } = newDescriptor;

checkKey(key);
    checkDescriptor(newDescriptor);

let hasSaga = Reflect.has(store.injectedSagas, key);

if (process.env.NODE_ENV !== 'production') {
      const oldDescriptor = store.injectedSagas[key];
      // enable hot reloading of daemon and once-till-unmount sagas
      if (hasSaga && oldDescriptor.saga !== saga) {
        oldDescriptor.task.cancel();
        hasSaga = false;
      }
    }

if (
      !hasSaga ||
      (hasSaga && mode !== DAEMON && mode !== ONCE_TILL_UNMOUNT)
    ) {
      store.injectedSagas[key] = {
        ...newDescriptor,
        task: store.runSaga(saga, args),
      }; // eslint-disable-line no-param-reassign
    }
  };
}

export function ejectSagaFactory(store, isValid) {
  return function ejectSaga(key) {
    if (!isValid) checkStore(store);

checkKey(key);

if (Reflect.has(store.injectedSagas, key)) {
      const descriptor = store.injectedSagas[key];
      if (descriptor.mode !== DAEMON) {
        descriptor.task.cancel();
        // Clean up in production; in development we need `descriptor.saga` for hot reloading
        if (process.env.NODE_ENV === 'production') {
          // Need some value to be able to detect `ONCE_TILL_UNMOUNT` sagas in `injectSaga`
          store.injectedSagas[key] = 'done'; // eslint-disable-line no-param-reassign
        }
      }
    }
  };
}

export default function getInjectors(store) {
  checkStore(store);

return {
    injectSaga: injectSagaFactory(store, true),
    ejectSaga: ejectSagaFactory(store, true),
  };
}