import {z} from 'zod'

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

export const uUID = z.string();

export const fundSlug = z.enum(["EUTBL", "USTBL", "SPKCC", "UKTBL", "SAFO", "SAFO-DATED-DEV"]);

export const httpsUrl = z.string();

export const shareClassSymbol = z.enum(["EUTBL", "USTBL", "eurUSTBL", "SPKCC", "eurSPKCC", "UKTBL", "eurUKTBL", "SAFO", "SAFOd", "eurSAFO", "eurSAFOd", "gbpSAFO", "gbpSAFOd", "chfSAFO", "sekSAFO", "nokSAFO", "dkkSAFO", "plnSAFO", "hufSAFO", "czkSAFO", "SAFO-DATED-DEV", "eurSAFO-DATED-DEV", "gbpSAFO-DATED-DEV"]);

export const getApiLegalDocumentsResponse = z.array(z.object({fundId: uUID, fundSlug: fundSlug, prospectusUrlByLocale: z.object({en: httpsUrl, es: httpsUrl, fr: httpsUrl, it: httpsUrl, de: httpsUrl, nl: httpsUrl}), shareClasses: z.array(z.object({symbol: shareClassSymbol, keyInformationDocumentUrlByLocale: z.object({en: httpsUrl, es: httpsUrl, fr: httpsUrl, it: httpsUrl, de: httpsUrl, nl: httpsUrl})}))}));

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
};

/**
 * Stable links to each fund's prospectus and to the Key Information Document of each of its share classes, in every language they are published in.
 * 
 * GET /legal-documents/
 */
export const getApiLegalDocuments = async (options?: GetApiLegalDocumentsOptions) => {
const {baseUrl = "https://public-api.spiko.io/v0", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/legal-documents/${query.size > 0 ? `?${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(getApiLegalDocumentsResponse, await res.json())
};