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import { addToEnd, addToStart, ensureQueryFn } from './utils'
import type { QueryBehavior } from './query'
import type {
InfiniteData,
InfiniteQueryPageParamsOptions,
OmitKeyof,
QueryFunctionContext,
QueryKey,
} from './types'
export function infiniteQueryBehavior<TQueryFnData, TError, TData, TPageParam>(
pages?: number,
): QueryBehavior<TQueryFnData, TError, InfiniteData<TData, TPageParam>> {
return {
onFetch: (context, query) => {
const options = context.options as InfiniteQueryPageParamsOptions<TData>
const direction = context.fetchOptions?.meta?.fetchMore?.direction
const oldPages = context.state.data?.pages || []
const oldPageParams = context.state.data?.pageParams || []
let result: InfiniteData<unknown> = { pages: [], pageParams: [] }
let currentPage = 0
const fetchFn = async () => {
let cancelled = false
const addSignalProperty = (object: unknown) => {
Object.defineProperty(object, 'signal', {
enumerable: true,
get: () => {
if (context.signal.aborted) {
cancelled = true
} else {
context.signal.addEventListener('abort', () => {
cancelled = true
})
}
return context.signal
},
})
}
const queryFn = ensureQueryFn(context.options, context.fetchOptions)
// Create function to fetch a page
const fetchPage = async (
data: InfiniteData<unknown>,
param: unknown,
previous?: boolean,
): Promise<InfiniteData<unknown>> => {
if (cancelled) {
return Promise.reject()
}
if (param == null && data.pages.length) {
return Promise.resolve(data)
}
const createQueryFnContext = () => {
const queryFnContext: OmitKeyof<
QueryFunctionContext<QueryKey, unknown>,
'signal'
> = {
client: context.client,
queryKey: context.queryKey,
pageParam: param,
direction: previous ? 'backward' : 'forward',
meta: context.options.meta,
}
addSignalProperty(queryFnContext)
return queryFnContext as QueryFunctionContext<QueryKey, unknown>
}
const queryFnContext = createQueryFnContext()
const page = await queryFn(queryFnContext)
const { maxPages } = context.options
const addTo = previous ? addToStart : addToEnd
return {
pages: addTo(data.pages, page, maxPages),
pageParams: addTo(data.pageParams, param, maxPages),
}
}
// fetch next / previous page?
if (direction && oldPages.length) {
const previous = direction === 'backward'
const pageParamFn = previous ? getPreviousPageParam : getNextPageParam
const oldData = {
pages: oldPages,
pageParams: oldPageParams,
}
const param = pageParamFn(options, oldData)
result = await fetchPage(oldData, param, previous)
} else {
const remainingPages = pages ?? oldPages.length
// Fetch all pages
do {
const param =
currentPage === 0
? (oldPageParams[0] ?? options.initialPageParam)
: getNextPageParam(options, result)
if (currentPage > 0 && param == null) {
break
}
result = await fetchPage(result, param)
currentPage++
} while (currentPage < remainingPages)
}
return result
}
if (context.options.persister) {
context.fetchFn = () => {
return context.options.persister?.(
fetchFn as any,
{
client: context.client,
queryKey: context.queryKey,
meta: context.options.meta,
signal: context.signal,
},
query,
)
}
} else {
context.fetchFn = fetchFn
}
},
}
}
function getNextPageParam(
options: InfiniteQueryPageParamsOptions<any>,
{ pages, pageParams }: InfiniteData<unknown>,
): unknown | undefined {
const lastIndex = pages.length - 1
return pages.length > 0
? options.getNextPageParam(
pages[lastIndex],
pages,
pageParams[lastIndex],
pageParams,
)
: undefined
}
function getPreviousPageParam(
options: InfiniteQueryPageParamsOptions<any>,
{ pages, pageParams }: InfiniteData<unknown>,
): unknown | undefined {
return pages.length > 0
? options.getPreviousPageParam?.(pages[0], pages, pageParams[0], pageParams)
: undefined
}
/**
* Checks if there is a next page.
*/
export function hasNextPage(
options: InfiniteQueryPageParamsOptions<any, any>,
data?: InfiniteData<unknown>,
): boolean {
if (!data) return false
return getNextPageParam(options, data) != null
}
/**
* Checks if there is a previous page.
*/
export function hasPreviousPage(
options: InfiniteQueryPageParamsOptions<any, any>,
data?: InfiniteData<unknown>,
): boolean {
if (!data || !options.getPreviousPageParam) return false
return getPreviousPageParam(options, data) != null
}
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