import {z} from 'zod'

export type GetApiScheduleFlightsArgs = {carrierCode: string, flightNumber: string, scheduledDepartureDate: string, operationalSuffix?: string | undefined};

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

export const flightDesignator = z.object({carrierCode: z.string().optional(), flightNumber: z.number().int().optional(), operationalSuffix: z.string().optional()});

export const terminal = z.object({code: z.string().optional()});

export const gate = z.object({mainGate: z.string().optional()});

export const delay = z.object({duration: z.string().optional()});

export const timing = z.object({qualifier: z.string().optional(), value: z.string().optional(), delays: z.array(delay).optional()});

export const departure = z.object({terminal: terminal.optional(), gate: gate.optional(), timings: z.array(timing).optional()});

export const arrival = z.object({terminal: terminal.optional(), gate: gate.optional(), timings: z.array(timing).optional()});

export const flightPoint = z.object({iataCode: z.string().optional(), departure: departure.optional(), arrival: arrival.optional()});

export const partnership = z.object({operatingFlight: flightDesignator.optional()});

export const segment = z.object({boardPointIataCode: z.string().optional(), offPointIataCode: z.string().optional(), scheduledSegmentDuration: z.string().optional(), partnership: partnership.optional()});

export const aircraftEquipment = z.object({aircraftType: z.string().optional()});

export const leg = z.object({boardPointIataCode: z.string().optional(), offPointIataCode: z.string().optional(), aircraftEquipment: aircraftEquipment.optional(), scheduledLegDuration: z.string().optional()});

export const datedFlight = z.object({type: z.string().optional(), scheduledDepartureDate: z.string().optional(), flightDesignator: flightDesignator.optional(), flightPoints: z.array(flightPoint).optional(), segments: z.array(segment).optional(), legs: z.array(leg).optional()});

export const collectionMeta = 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 issue = z.object({status: z.number().int().optional(), code: z.number().int().optional(), title: z.string().optional(), detail: z.string().optional(), source: z.object({pointer: z.string().optional(), parameter: z.string().optional(), example: z.string().optional()}).optional()});

export const getApiScheduleFlightsResponse = z.object({data: z.array(datedFlight), meta: collectionMeta.optional(), warnings: z.array(issue).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
};

/**
 * Retrieves a unique flight by search criteria.
 * 
 * GET /schedule/flights
 */
export const getApiScheduleFlights = async (args: GetApiScheduleFlightsArgs, options?: GetApiScheduleFlightsOptions) => {
const {baseUrl = "https://test.api.amadeus.com/v2", fetch: fetchFn = fetch} = options ?? {}

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

if (args.carrierCode != null) query.append("carrierCode", String(args.carrierCode))
if (args.flightNumber != null) query.append("flightNumber", String(args.flightNumber))
if (args.scheduledDepartureDate != null) query.append("scheduledDepartureDate", String(args.scheduledDepartureDate))
if (args.operationalSuffix != null) query.append("operationalSuffix", String(args.operationalSuffix))

const url = `${baseUrl.replace(/\/+$/, '')}/schedule/flights${query.size > 0 ? `?${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(getApiScheduleFlightsResponse, await res.json())
};