import {z} from 'zod'

export type GetApiTravelPredictionsFlightDelayArgs = {originLocationCode: string, destinationLocationCode: string, departureDate: string, departureTime: string, arrivalDate: string, arrivalTime: string, aircraftCode: string, carrierCode: string, flightNumber: string, duration: string};

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

export const predictionResultType = z.enum(["LESS_THAN_30_MINUTES", "BETWEEN_30_AND_60_MINUTES", "BETWEEN_60_AND_120_MINUTES", "OVER_120_MINUTES_OR_CANCELLED"]);

export const delayPrediction = z.object({type: z.string().optional(), subType: z.string().optional(), id: z.string().optional(), result: predictionResultType.optional(), probability: z.string().optional()});

export const collectionMetaLink = z.object({count: z.number().int().optional(), links: z.object({self: z.string().optional(), next: z.string().optional(), previous: z.string().optional(), last: z.string().optional(), first: z.string().optional(), up: z.string().optional()}).optional()});

export const prediction = z.object({data: z.array(delayPrediction).optional(), meta: collectionMetaLink.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
};

/**
 * Return the delay segment where the flight is likely to lay.
 * 
 * GET /travel/predictions/flight-delay
 */
export const getApiTravelPredictionsFlightDelay = async (args: GetApiTravelPredictionsFlightDelayArgs, options?: GetApiTravelPredictionsFlightDelayOptions) => {
const {baseUrl = "https://test.api.amadeus.com/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.originLocationCode != null) query.append("originLocationCode", String(args.originLocationCode))
if (args.destinationLocationCode != null) query.append("destinationLocationCode", String(args.destinationLocationCode))
if (args.departureDate != null) query.append("departureDate", String(args.departureDate))
if (args.departureTime != null) query.append("departureTime", String(args.departureTime))
if (args.arrivalDate != null) query.append("arrivalDate", String(args.arrivalDate))
if (args.arrivalTime != null) query.append("arrivalTime", String(args.arrivalTime))
if (args.aircraftCode != null) query.append("aircraftCode", String(args.aircraftCode))
if (args.carrierCode != null) query.append("carrierCode", String(args.carrierCode))
if (args.flightNumber != null) query.append("flightNumber", String(args.flightNumber))
if (args.duration != null) query.append("duration", String(args.duration))

const url = `${baseUrl.replace(/\/+$/, '')}/travel/predictions/flight-delay${query.size > 0 ? `?${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(prediction, await res.json())
};