import {z} from 'zod'

export type GetApiV1CountriesCountryCodeHolidaysArgs = {countryCode: string, fromDate?: string | undefined, toDate?: string | undefined, locale?: string | undefined};

export type GetApiV1CountriesCountryCodeHolidaysOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const getApiV1CountriesCountryCodeHolidaysResponse = z.object({results: z.array(z.object({name: z.string(), key: z.string(), startDate: z.string(), endDate: z.string()})), metadata: z.object({resultCount: z.number().int().gte(0).lte(9007199254740991), countryCode: z.string(), window: z.enum(["explicit", "upcoming"]), from: z.string(), to: z.string()})});

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
};

/**
 * Public holidays for a market
 * 
 * GET /v1/countries/{countryCode}/holidays
 * 
 * Also accepts auth: bearerAuth
 */
export const getApiV1CountriesCountryCodeHolidays = async (args: GetApiV1CountriesCountryCodeHolidaysArgs, options?: GetApiV1CountriesCountryCodeHolidaysOptions) => {
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.fromDate != null) query.append("fromDate", String(args.fromDate))
if (args.toDate != null) query.append("toDate", String(args.toDate))
if (args.locale != null) query.append("locale", String(args.locale))
if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/countries/${encodeURIComponent(String(args.countryCode))}/holidays${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(getApiV1CountriesCountryCodeHolidaysResponse, await res.json())
};