import {z} from 'zod'

export type PassengerCount = {adults?: number | undefined, children?: number | undefined, infants_in_seat?: number | undefined, infants_on_lap?: number | undefined};

export type TripFlightSearch = {origin: string, destination: string, depart_date: string, return_date?: (string | null) | undefined, passenger_mix?: PassengerCount | undefined, cabin_class?: ('economy' | 'premium_economy' | 'business' | 'first') | undefined, nonstop?: boolean | undefined, airlines?: string | undefined, exclude_airlines?: string | undefined, include_redeye?: boolean | undefined, max_stops?: (number | null) | undefined, depart_after?: string | undefined, depart_before?: string | undefined};

export type EntrySearchWarmRequest = {flight_search: TripFlightSearch};

export type CreateApiConvEntrySearchWarmArgs = {body: EntrySearchWarmRequest};

export type CreateApiConvEntrySearchWarmOptions = {baseUrl: string, HTTPBearer?: string | undefined, fetch?: typeof fetch | undefined};

export const entrySearchWarmResponse = z.object({started: z.boolean()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Warm Entry Search
 * 
 * POST /conv/entry-search/warm
 */
export const createApiConvEntrySearchWarm = async (args: CreateApiConvEntrySearchWarmArgs, options: CreateApiConvEntrySearchWarmOptions) => {
const {baseUrl, fetch: fetchFn = fetch, HTTPBearer} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (HTTPBearer !== undefined) headers.set('authorization', `Bearer ${HTTPBearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/conv/entry-search/warm${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(entrySearchWarmResponse, await res.json())
};