import {z} from 'zod'

export type GetApiV1FlightsSchedulesArgs = {from: string, to: string, airline?: string | undefined, siteCode?: string | undefined, locale?: string | undefined, page?: number | undefined, pageSize?: number | undefined};

export type GetApiV1FlightsSchedulesOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1FlightsSchedulesResponse = z.object({results: z.array(z.object({airlineCode: z.string(), departureAirportCode: z.string(), arrivalAirportCode: z.string(), departureTime: z.string(), arrivalTime: z.string(), durationMinutes: z.number(), stopsCount: z.number(), arrivalDayOffset: z.number(), segments: z.array(z.object({departureAirportCode: z.string(), arrivalAirportCode: z.string(), departureTime: z.string(), arrivalTime: z.string(), airlineCode: z.string(), airlineName: z.string().optional(), durationMinutes: z.number().optional(), flightNumber: z.string().optional(), aircraftCode: z.string().optional(), aircraftName: z.string().optional()})), operatingPeriods: z.array(z.object({weekdays: z.array(z.number().int().gte(1).lte(7)).optional(), startDate: z.string().optional(), endDate: z.string().optional()})), flightNumber: z.string().optional(), aircraftCode: z.string().optional()})), metadata: z.object({page: z.number().int().gte(1).lte(9007199254740991), pageSize: z.number().int().gte(1).lte(9007199254740991), resultCount: z.number().int().gte(0).lte(9007199254740991), totalCandidates: z.number().int().gte(0).lte(9007199254740991), hasMore: z.boolean(), coverage: z.enum(["complete", "truncated"]), from: z.object({requested: z.string(), resolvedCityCode: z.string()}), to: z.object({requested: z.string(), resolvedCityCode: z.string()}), siteCode: z.string(), siteCodeSource: z.enum(["explicit", "default"])})});

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
};

/**
 * Published timetable for a route
 * 
 * GET /v1/flights/schedules
 * 
 * Also accepts auth: bearerAuth
 */
export const getApiV1FlightsSchedules = async (args: GetApiV1FlightsSchedulesArgs, options?: GetApiV1FlightsSchedulesOptions) => {
const {baseUrl = "https://api.wego.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (args.from != null) query.append("from", String(args.from))
if (args.to != null) query.append("to", String(args.to))
if (args.airline != null) query.append("airline", String(args.airline))
if (args.siteCode != null) query.append("siteCode", String(args.siteCode))
if (args.locale != null) query.append("locale", String(args.locale))
if (args.page != null) query.append("page", String(args.page))
if (args.pageSize != null) query.append("pageSize", String(args.pageSize))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/flights/schedules${query.size > 0 ? `?${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(getApiV1FlightsSchedulesResponse, await res.json())
};