import {z} from 'zod'

export type GetApiV1FlightsSearchLinkArgs = {from: string, to: string, fromCity?: (boolean | '0' | '1' | 'true' | 'false') | undefined, toCity?: (boolean | '0' | '1' | 'true' | 'false') | undefined, fromDate: string, toDate?: string | undefined, cabin?: ('economy' | 'premium_economy' | 'business' | 'first') | undefined, adults?: number | undefined, children?: number | undefined, infants?: number | undefined, siteCode?: string | undefined, currency?: string | undefined, locale?: string | undefined};

export type GetApiV1FlightsSearchLinkOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1FlightsSearchLinkResponse = z.object({searchUrl: z.string(), expires: z.literal(false)});

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
};

/**
 * Build a durable wego.com search link
 * 
 * GET /v1/flights/search-link
 * 
 * Also accepts auth: bearerAuth
 */
export const getApiV1FlightsSearchLink = async (args: GetApiV1FlightsSearchLinkArgs, options?: GetApiV1FlightsSearchLinkOptions) => {
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.fromCity != null) query.append("fromCity", String(args.fromCity))
if (args.toCity != null) query.append("toCity", String(args.toCity))
if (args.fromDate != null) query.append("fromDate", String(args.fromDate))
if (args.toDate != null) query.append("toDate", String(args.toDate))
if (args.cabin != null) query.append("cabin", String(args.cabin))
if (args.adults != null) query.append("adults", String(args.adults))
if (args.children != null) query.append("children", String(args.children))
if (args.infants != null) query.append("infants", String(args.infants))
if (args.siteCode != null) query.append("siteCode", String(args.siteCode))
if (args.currency != null) query.append("currency", String(args.currency))
if (args.locale != null) query.append("locale", String(args.locale))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/flights/search-link${query.size > 0 ? `?${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(getApiV1FlightsSearchLinkResponse, await res.json())
};