const memory = {}

const isLoading = (state = false, action = {}, mem = memory) => {
  switch (action.type) {
    case 'LIST':
      return !mem[action.payload.category]
    case 'VIDEO':
      return !mem[action.payload.slug]
    case 'VIDEOS_FETCHED':
      return !(mem[action.payload.category] = true)
    case 'VIDEO_FOUND':
      return !(mem[action.payload.slug] = true)
    default:
      return state
  }
}



// the thunk for /video/:slug has to change to this:

VIDEO: {
  path: '/video/:slug',
  thunk: async (dispatch, getState) => {
    const { location: { payload: { slug } } } = getState()
    const video = await fetchData(`/api/video/${slug}`)

    if (!video) {
      return dispatch({ type: NOT_FOUND })
    }

    dispatch({ type: 'VIDEO_FOUND', payload: { slug, video }) // put the slug in the payload now
  }
},