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errorCodes,
HttpResponse,
QuotesV2,
QuotesV2Response,
QuotesV2SearchParams,
} from '@karhoo/demand-api'
import { Subject, Subscription, timer } from 'rxjs'
import { distinctUntilChanged, map, publishReplay, refCount } from 'rxjs/operators'
import { poll } from './polling'
import { QuoteItem, transformer } from './transformer'
type QuoteFilters = {
numOfPassengers: number
numOfLuggage: number
}
const NO_QUOTES_AVAILABLE = errorCodes.K3002
export const defaultValidity = 600
function createStream<T>(stream: Subject<T>) {
return stream.pipe(publishReplay(1), refCount())
}
export type QuotesService = Pick<QuotesV2, 'quotesSearch' | 'quotesSearchById'>
export type QuotesState = {
items: QuoteItem[]
validity: number
}
export class QuotesBloc {
private quotesService: QuotesService
private _filters: QuoteFilters
private _searchParams: QuotesV2SearchParams | null
private _locale?: string
private quotes$ = new Subject<QuotesState>()
private quotesExpired$ = new Subject()
private noQuotesFound$ = new Subject()
private quotesLoadingError$ = new Subject()
private loading$ = new Subject<boolean>()
private pollingSubscription = new Subscription()
private timerSubscription = new Subscription()
constructor(quotesService: QuotesService) {
this.quotesService = quotesService
this._filters = {
numOfLuggage: 0,
numOfPassengers: 1,
}
this._searchParams = null
}
/**
* Returns not-filtered quotes stream. Each iteration it is a quotes array
*/
get quotes() {
return createStream(this.quotes$)
}
/**
* Returns matching quotes stream (by number of passengers and number of luggage filters)
*/
get matchingQuotes() {
return this.quotes.pipe(map(({ items }) => items.filter(this.isMatchingQuote)))
}
/**
* Returns non-matching quotes stream (by number of passengers and number of luggage filters)
*/
get otherAvailibleQuotes() {
return this.quotes.pipe(map(({ items }) => items.filter(q => !this.isMatchingQuote(q))))
}
/**
* Emits value once there are no quotes available for given search params
*/
get noQuotesFound() {
return createStream(this.noQuotesFound$)
}
/**
* Emits true/false when all quotes started/finished to load
*/
get loading() {
return createStream(this.loading$).pipe(distinctUntilChanged())
}
/**
* Emits a value once loaded quotes are expired
*/
get quotesExpired() {
return createStream(this.quotesExpired$)
}
/**
* Emits a value with an error if loading of quotes failed
*/
get quotesLoadingErrors() {
return createStream(this.quotesLoadingError$)
}
/**
* Gets filters value (number of passengers and number of luggage)
*/
get filters() {
return this._filters
}
/**
* Sets filters value (number of passengers and number of luggage)
*/
set filters(params: QuoteFilters) {
this._filters = params
}
/**
* Gets quote search params
*/
get searchParams(): QuotesV2SearchParams | null {
return this._searchParams
}
/**
* Sets quote search params
*/
set searchParams(params: QuotesV2SearchParams | null) {
this._searchParams = params
}
private startLoading() {
this.loading$.next(true)
}
private stopLoading() {
this.loading$.next(false)
}
private isMatchingQuote = (quote: QuoteItem) =>
quote.vehiclePassengerCapacity >= this._filters.numOfPassengers &&
quote.vehicleLuggageCapacity >= this._filters.numOfLuggage
private convertValidityToMS(Ivalidity = 0) {
return Date.now() + validity * 1000
}
/**
* Schedules an `quotes expired` event
* @param expiresAt {number} Date in miliseconds after which `quotes expired` event is emitted
*/
scheduleExpiredEvent(IexpiresAt = 0) {
const expired = timer(expiresAt - Date.now())
this.timerSubscription = expired.subscribe(() => {
this.quotesExpired$.next()
})
}
/**
* Stops requesting quotes
*/
stopRequestingQuotes() {
this.stopLoading()
this.pollingSubscription.unsubscribe()
}
/**
* Requests quotes with previous search params
*/
refreshQuotes() {
if (!this._searchParams) {
throw new Error('searchParams is not defined, try setting it up first')
}
this.timerSubscription.unsubscribe()
this.pollingSubscription.unsubscribe()
this.requestQuotes(this._searchParams, this._locale)
}
/**
* Requests quotes with given search params
* @param params {QuotesSearchParams} search params for quotes
* @param locale {string} user locale in xx-XX format e.g. en-GB or fr-FR
*/
async requestQuotes(params: QuotesV2SearchParams, locale?: string) {
this.searchParams = params
this._locale = locale
this.startLoading()
this.timerSubscription.unsubscribe()
this.pollingSubscription.unsubscribe()
const handleQuotesLoaded = (res: HttpResponse<QuotesV2Response>) => {
if (res.ok) {
const items = res.body?.quotes || []
this.quotes$.next({
items: items.map(quote => transformer(quote)),
validity: this.convertValidityToMS(res.body.validity || defaultValidity),
})
}
}
try {
const requestQuotesResponse = await this.quotesService.quotesSearch(params)
if (requestQuotesResponse.ok) {
const { body } = requestQuotesResponse
handleQuotesLoaded(requestQuotesResponse)
this.scheduleExpiredEvent(this.convertValidityToMS(body.validity))
const poller = poll(() => this.quotesService.quotesSearchById(body.id, locale))
this.pollingSubscription = poller.subscribe({
next: handleQuotesLoaded,
complete: () => {
this.stopLoading()
},
})
return
}
this.stopLoading()
if (requestQuotesResponse.error.code === NO_QUOTES_AVAILABLE) {
this.noQuotesFound$.next()
this.quotesLoadingError$.next(requestQuotesResponse.error)
} else {
this.quotesLoadingError$.next(requestQuotesResponse.error)
}
} catch (err) {
this.stopLoading()
this.quotesLoadingError$.next(err as Error)
}
}
dispose() {
this.quotes$.complete()
this.noQuotesFound$.complete()
this.quotesLoadingError$.complete()
this.loading$.complete()
this.quotesExpired$.complete()
this.stopRequestingQuotes()
}
}
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