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1118 stevensc 1 
import { TOPIC_ACTIONS } from './topics.types'
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const initialState = {
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  topicsAllIds: [],
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  topicById: {},
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  capsulesAllIds: [],
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  capsuleById: {},
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  slidesAllIds: [],
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  slideById: {}
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}
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const topicsReducer = (state = initialState, { type, payload }) => {
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  switch (type) {
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    case TOPIC_ACTIONS.ADD_TOPIC: {
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      const { uuid, ...topic } = payload
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      const topicsIds = new Set([...state.topicsAllIds, uuid])
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      return {
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        ...state,
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        topicById: {
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          ...state.topicById,
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          [uuid]: { ...topic, uuid }
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        },
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        topicsAllIds: Array.from(topicsIds)
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      }
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    }
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    case TOPIC_ACTIONS.ADD_CAPSULE: {
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      const { topicId, capsule } = payload
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      const capsulesIds = new Set([...state.capsulesAllIds, capsule.uuid])
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      return {
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        ...state,
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        capsuleById: {
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          ...state.capsuleById,
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          [capsule.uuid]: { ...capsule, topicId }
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        },
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        capsulesAllIds: Array.from(capsulesIds)
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      }
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    }
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    case TOPIC_ACTIONS.ADD_SLIDE: {
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      const { capsuleId, slide } = payload
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      const topicId = state.capsuleById[capsuleId].topicId
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      const slidesIds = new Set([...state.slidesAllIds, slide.uuid])
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      return {
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        ...state,
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        slideById: {
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          ...state.slideById,
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          [slide.uuid]: { ...slide, capsuleId, topicId }
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        },
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        slidesAllIds: Array.from(slidesIds)
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      }
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    }
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    case TOPIC_ACTIONS.COMPLETE_TOPIC: {
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      const uuid = payload
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      const completedTopic = { ...state.topicById[uuid], completed: 1 }
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      return {
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        ...state,
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        topicById: {
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          ...state.topicById,
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          [uuid]: completedTopic
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        }
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      }
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    }
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    case TOPIC_ACTIONS.COMPLETE_CAPSULE: {
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      const uuid = payload
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      const completedCapsule = { ...state.capsuleById[uuid], completed: 1 }
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      return {
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        ...state,
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        capsuleById: {
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          ...state.capsuleById,
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          [uuid]: completedCapsule
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        }
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      }
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    }
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    case TOPIC_ACTIONS.COMPLETE_SLIDE: {
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      const uuid = payload
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      const completedSlide = { ...state.slideById[uuid], completed: 1 }
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      return {
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        ...state,
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        slideById: {
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          ...state.slideById,
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          [uuid]: completedSlide
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        }
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      }
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    }
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    default:
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      return state
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  }
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}
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export default topicsReducer