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my-reviews-context.tsx
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my-reviews-context.tsx
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import React from 'react'
import humps from 'humps'
type FetchReview = ({
resourceId,
resourceType,
}: {
resourceId: string
resourceType: string
}) => Promise<any>
type StateAndCount = {
reviewed: boolean
reviewsCount: number
}
type DeriveCurrentStateAndCount = ({
id,
reviewed,
reviewsCount,
}: { id: string } & StateAndCount) => StateAndCount
const NOOP = () => {}
interface MyReviewsContextProps {
myReviews: { [key: string]: boolean }
actions: {
deleteMyReview: Function
fetchMyReview: ({ id: string }) => Promise<any>
}
deriveCurrentStateAndCount: DeriveCurrentStateAndCount
}
const Context = React.createContext<MyReviewsContextProps>({
myReviews: {},
actions: {
deleteMyReview: NOOP,
fetchMyReview: () => Promise.resolve(null),
},
deriveCurrentStateAndCount: ({ reviewed, reviewsCount }) => ({
reviewed,
reviewsCount,
}),
})
interface MyReviewsProviderProps {
myReviews: { [key: string]: boolean }
fetchMyReview: FetchReview
resourceType: string
subscribeReviewUpdateEvent: Function
}
interface MyReviewsProviderState {
myReviews: { [key: string]: boolean }
}
export class MyReviewsProvider extends React.PureComponent<
MyReviewsProviderProps,
MyReviewsProviderState
> {
state = { myReviews: this.props.myReviews || {} }
insert = (newReviews) =>
this.setState(({ myReviews }) => ({
myReviews: { ...myReviews, ...newReviews },
}))
handleFetch = async ({ id }) => {
const { fetchMyReview, resourceType } = this.props
const response = await fetchMyReview({ resourceId: id, resourceType })
if (response.ok) {
const myReview = humps.camelizeKeys(await response.json())
this.insert({ [id]: myReview })
return myReview
} else if (response.status === 404) {
this.insert({ [id]: null })
return null
}
}
handleDelete = ({ id }) => this.insert({ [id]: null })
deriveCurrentStateAndCount = ({
id,
reviewed,
reviewsCount: originalReviewsCount,
}) => {
const { myReviews } = this.state
const currentReview = myReviews[id]
const reviewsCount = Number(originalReviewsCount || 0)
if (typeof reviewed !== 'boolean' || typeof currentReview === 'undefined') {
/* At least one of the status are unknown: Reduces to a bitwise OR operation */
return { reviewed: !!reviewed || !!currentReview, reviewsCount }
}
return {
reviewed: !!currentReview,
reviewsCount:
reviewed === !!currentReview
? reviewsCount
: currentReview
? reviewsCount + 1
: reviewsCount - 1,
}
}
componentDidMount() {
this.props.subscribeReviewUpdateEvent(this.handleFetch)
}
render() {
const {
props: { children },
state: { myReviews },
} = this
return (
<Context.Provider
value={{
myReviews,
deriveCurrentStateAndCount: this.deriveCurrentStateAndCount,
actions: {
deleteMyReview: this.handleDelete,
fetchMyReview: this.handleFetch,
},
}}
>
{children}
</Context.Provider>
)
}
}
export function useMyReviewsContext() {
return React.useContext(Context)
}
export function withMyReviews(Component) {
return function MyReviewsComponent(props) {
return (
<Context.Consumer>
{({ myReviews, actions, deriveCurrentStateAndCount }) => (
<Component
myReviews={myReviews}
myReviewActions={actions}
deriveCurrentReviewedStateAndCount={deriveCurrentStateAndCount}
{...props}
/>
)}
</Context.Consumer>
)
}
}