@coorpacademy/progression-engine/es/reducers/stars.js

import find from 'lodash/fp/find';
import includes from 'lodash/fp/includes';


export default function stars(config) {
  return (currentStars = 0, action, state) => {
    switch (action.type) {
      case 'answer':
        {
          const answerAction = action;
          return !answerAction.payload.instructions && answerAction.payload.isCorrect ? currentStars + config.starsPerCorrectAnswer : currentStars;
        }
      case 'clue':
        {
          const requestedClueAction = action;
          const slideRef = requestedClueAction.payload.content.ref;
          return includes(slideRef, state.requestedClues) ? currentStars : currentStars + config.starsPerAskingClue;
        }
      case 'resource':
        {
          const contentResourceViewedAction = action;
          const contentRef = contentResourceViewedAction.payload.content.ref;
          const contentType = contentResourceViewedAction.payload.content.type;
          const contentResourceAlreadyViewed = Boolean(find({ type: contentType, ref: contentRef }, state.viewedResources));
          if (contentResourceAlreadyViewed) {
            return currentStars;
          }
          return currentStars + config.starsPerResourceViewed;
        }
      default:
        return currentStars;
    }
  };
}
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