@coorpacademy/progression-engine/es/update-state.js

import update from 'lodash/fp/update';
import map from 'lodash/fp/map';
import pipe from 'lodash/fp/pipe';
import reduce from 'lodash/fp/reduce';
import isEmpty from 'lodash/fp/isEmpty';
import allAnswers from './reducers/all-answers';
import content from './reducers/content';
import hasViewedAResourceAtThisStep from './reducers/has-viewed-a-resource-at-this-step';
import isCorrect from './reducers/is-correct';
import lives from './reducers/lives';
import livesDisabled from './reducers/lives-disabled';
import nextContent from './reducers/next-content';
import remainingLifeRequests from './reducers/remaining-life-requests';
import requestedClues from './reducers/requested-clues';
import slides from './reducers/slides';
import stars from './reducers/stars';
import step from './reducers/step';
import validate from './reducers/validate';
import viewedResources from './reducers/viewed-resources';
import variables from './reducers/variables';


function combineReducers(fnMap // eslint-disable-line flowtype/no-weak-types
) {
  // eslint-disable-next-line flowtype/require-return-type
  const fns = map(({ fn, key }) => {
    return (config, action) => state => {
      if (!key) return fn(config)(state, action);
      const newState = update(key, value => fn(config)(value, action, state), state);
      return newState;
    };
  }, fnMap);

  return config => {
    return (state, action) => {
      validate(config)(state, action);
      return pipe(...map(fn => fn(config, action), fns))(state);
    };
  };
}

const reduceAction = combineReducers([{ key: 'livesDisabled', fn: livesDisabled }, { key: 'isCorrect', fn: isCorrect }, { key: 'slides', fn: slides }, { key: 'lives', fn: lives }, { key: 'step', fn: step }, { key: 'stars', fn: stars }, { key: 'requestedClues', fn: requestedClues }, { key: 'viewedResources', fn: viewedResources }, { key: 'remainingLifeRequests', fn: remainingLifeRequests }, { key: 'hasViewedAResourceAtThisStep', fn: hasViewedAResourceAtThisStep }, { key: 'content', fn: content }, { key: 'nextContent', fn: nextContent }, { key: 'allAnswers', fn: allAnswers }, { fn: variables }]);

export default function updateState(config, state, actions) {
  if (isEmpty(actions)) {
    return reduce(reduceAction(config), state, [{ type: 'init' }]);
  }

  return reduce(reduceAction(config), state, actions);
}
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