import {z} from 'zod'

export type CreateApiV1FlightsSearchesArgs = {body: {from: string, to: string, fromDate: string, toDate?: string | undefined, cabin?: ('economy' | 'premium_economy' | 'business' | 'first') | undefined, adults?: number | undefined, children?: number | undefined, infants?: number | undefined, currency?: string | undefined, locale?: string | undefined, siteCode?: string | undefined}};

export type CreateApiV1FlightsSearchesOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiV1FlightsSearchesResponse = z.object({searchId: 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
};

/**
 * Create a flight search
 * 
 * POST /v1/flights/searches
 * 
 * Also accepts auth: bearerAuth
 */
export const createApiV1FlightsSearches = async (args: CreateApiV1FlightsSearchesArgs, options?: CreateApiV1FlightsSearchesOptions) => {
const {baseUrl = "https://api.wego.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/flights/searches${query.size > 0 ? `?${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(createApiV1FlightsSearchesResponse, await res.json())
};