import {z} from 'zod'

export type GetApiTimestagsArgs = {query: string, filter?: ('Des' | 'Geo' | 'Org' | 'Per') | undefined, max?: number | undefined};

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

export const getApiTimestagsResponse = z.array(z.array(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
};

/**
 * GET /timestags
 */
export const getApiTimestags = async (args: GetApiTimestagsArgs, options?: GetApiTimestagsOptions) => {
const {baseUrl = "http://api.nytimes.com/svc/suggest/v1", fetch: fetchFn = fetch, apikey} = options ?? {}

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

if (args.query != null) query.append("query", String(args.query))
if (args.filter != null) query.append("filter", String(args.filter))
if (args.max != null) query.append("max", String(args.max))
if (apikey !== undefined) query.set("api-key", apikey)

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