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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 topic = payload
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      const topicsIds = new Set([...state.topicsAllIds, topic.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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          [topic.uuid]: topic
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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 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
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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 slide = payload
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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
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        },
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        slidesAllIds: Array.from(slidesIds)
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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