import {z} from 'zod'

export type GetApiFundersArgs = {filter?: string | undefined, cursor?: string | undefined, query?: string | undefined, rows?: number | undefined, mailto?: string | undefined, offset?: number | undefined};

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

export const query = z.object({"start-index": z.number().int(), "search-terms": z.number().int()});

export const funder = z.object({id: z.string(), location: z.string(), name: z.string(), "alt-names": z.array(z.string()), uri: z.string(), replaces: z.array(z.string()), "replaced-by": z.array(z.string()), tokens: z.array(z.string())});

export const funders = z.object({"items-per-page": z.number().int(), query: query, "total-results": z.number().int(), items: z.array(funder)});

export const fundersMessage = z.object({status: z.string(), "message-type": z.string(), "message-version": z.string(), message: funders});

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
};

/**
 * Returns a list of all funders in the [Funder Registry](https://gitlab.com/crossref/open_funder_registry).
 * 
 * GET /funders
 */
export const getApiFunders = async (args: GetApiFundersArgs, options: GetApiFundersOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.filter != null) query.append("filter", String(args.filter))
if (args.cursor != null) query.append("cursor", String(args.cursor))
if (args.query != null) query.append("query", String(args.query))
if (args.rows != null) query.append("rows", String(args.rows))
if (args.mailto != null) query.append("mailto", String(args.mailto))
if (args.offset != null) query.append("offset", String(args.offset))

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