@aller/blink/src/reducers/active-time.ts

A library for tracking user behaviour.

import {
  ARTICLE_ACTIVITY_START,
  ARTICLE_ACTIVITY_STOP,
  PAGE_INIT,
} from '../actions';
import { TimeEvent } from '../utils/event-time';

function activity(state: TimeEvent[] = [], action: any) {
  switch (action.type) {
    case ARTICLE_ACTIVITY_START:
      return [
        ...state,
        {
          type: 'start',
          time: action.payload.time || new Date(),
        },
      ];
    case ARTICLE_ACTIVITY_STOP:
      // don't add anything if last thing we added was a stop event
      if (state.length > 0 && state[state.length - 1].type === 'stop') {
        return state;
      }
      return [
        ...state,
        {
          type: 'stop',
          time: action.payload.time || new Date(),
        },
      ];
    default:
      break;
  }
  return state;
}

export default function activeTime(
  state: { [key: string]: any } = {},
  action: any,
) {
  switch (action.type) {
    case PAGE_INIT:
      return {}; // Flush the store on pageInit
    case ARTICLE_ACTIVITY_START:
    case ARTICLE_ACTIVITY_STOP: {
      const actState = state[action.payload.id]
        ? state[action.payload.id].activity
        : [];
      return {
        ...state,
        [action.payload.id]: {
          activity: activity(actState, action),
          url: action.payload.url,
          id: action.payload.id,
        },
      };
    }
    default:
      break;
  }
  return state;
}