import {z} from 'zod'

export type GetApiV1GoogleFlightsSearchArgs = {departure_id: string, arrival_id: string, outbound_date: string, return_date?: (string | null) | undefined, trip_type?: ('one_way' | 'round_trip' | 'multi_city') | undefined, adults?: number | undefined, children?: number | undefined, infants_in_seat?: number | undefined, infants_on_lap?: number | undefined, travel_class?: ('economy' | 'premium_economy' | 'business' | 'first') | undefined, currency?: string | undefined, gl?: string | undefined, hl?: string | undefined, stops?: ('any' | 'nonstop' | 'one_stop' | 'two_stops') | undefined, max_price?: (number | null) | undefined, sort_by?: ('top' | 'price') | undefined, departure_token?: (string | null) | undefined};

export type GetApiV1GoogleFlightsSearchOptions = {baseUrl?: string | undefined, apiKey?: string | undefined, fetch?: typeof fetch | undefined};

export const flightLeg = z.object({departure_airport: z.string().nullable().optional(), departure_airport_name: z.string().nullable().optional(), departure_time: z.string().nullable().optional(), arrival_airport: z.string().nullable().optional(), arrival_airport_name: z.string().nullable().optional(), arrival_time: z.string().nullable().optional(), duration_minutes: z.number().int().nullable().optional(), airline: z.string().nullable().optional(), airline_logo: z.string().nullable().optional(), flight_number: z.string().nullable().optional(), aircraft: z.string().nullable().optional(), travel_class: z.string().nullable().optional(), legroom: z.string().nullable().optional(), extensions: z.array(z.string()).optional()});

export const flightLayover = z.object({duration_minutes: z.number().int().nullable().optional(), airport: z.string().nullable().optional(), airport_name: z.string().nullable().optional(), overnight: z.boolean().optional()});

export const flightOffer = z.object({legs: z.array(flightLeg).optional(), layovers: z.array(flightLayover).optional(), total_duration_minutes: z.number().int().nullable().optional(), price: z.number().nullable().optional(), currency: z.string().nullable().optional(), price_type: z.enum(["base", "total"]).nullable().optional(), booking_token: z.string().nullable().optional(), booking_url: z.string().nullable().optional(), selection_token: z.string().nullable().optional(), departure_token: z.string().nullable().optional(), carbon_emissions_grams: z.number().int().nullable().optional(), carbon_emissions_diff_typical: z.number().int().nullable().optional(), airline_logo: z.string().nullable().optional(), extensions: z.array(z.string()).optional()});

export const flightPriceInsights = z.object({lowest_price: z.number().nullable().optional(), price_level: z.enum(["low", "typical", "high"]).nullable().optional(), typical_price_range: z.array(z.number()).nullable().optional(), price_history: z.array(z.array(z.number())).nullable().optional()});

export const flightAirport = z.object({iata_code: z.string(), name: z.string().nullable().optional(), city: z.string().nullable().optional(), country: z.string().nullable().optional()});

export const googleFlightsResponse = z.object({best_flights: z.array(flightOffer).optional(), other_flights: z.array(flightOffer).optional(), price_insights: flightPriceInsights.nullable().optional(), airports: z.array(flightAirport).optional(), departure_id: z.string(), arrival_id: z.string(), outbound_date: z.string(), return_date: z.string().nullable().optional(), currency: z.string().optional(), trip_type: z.enum(["one_way", "round_trip", "multi_city"]).optional(), search_url: z.string().nullable().optional()});

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
};

/**
 * Google Flights search
 * 
 * GET /v1/google/flights/search
 */
export const getApiV1GoogleFlightsSearch = async (args: GetApiV1GoogleFlightsSearchArgs, options?: GetApiV1GoogleFlightsSearchOptions) => {
const {baseUrl = "https://scrapebadger.com", fetch: fetchFn = fetch, apiKey} = options ?? {}

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

if (args.departure_id != null) query.append("departure_id", String(args.departure_id))
if (args.arrival_id != null) query.append("arrival_id", String(args.arrival_id))
if (args.outbound_date != null) query.append("outbound_date", String(args.outbound_date))
if (args.return_date != null) query.append("return_date", String(args.return_date))
if (args.trip_type != null) query.append("trip_type", String(args.trip_type))
if (args.adults != null) query.append("adults", String(args.adults))
if (args.children != null) query.append("children", String(args.children))
if (args.infants_in_seat != null) query.append("infants_in_seat", String(args.infants_in_seat))
if (args.infants_on_lap != null) query.append("infants_on_lap", String(args.infants_on_lap))
if (args.travel_class != null) query.append("travel_class", String(args.travel_class))
if (args.currency != null) query.append("currency", String(args.currency))
if (args.gl != null) query.append("gl", String(args.gl))
if (args.hl != null) query.append("hl", String(args.hl))
if (args.stops != null) query.append("stops", String(args.stops))
if (args.max_price != null) query.append("max_price", String(args.max_price))
if (args.sort_by != null) query.append("sort_by", String(args.sort_by))
if (args.departure_token != null) query.append("departure_token", String(args.departure_token))
if (apiKey !== undefined) headers.set("x-api-key", apiKey)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/google/flights/search${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "GET", headers})

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

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