import {z} from 'zod'

export type GetApiCArgs = {type?: string | undefined, mode?: string | undefined, label?: string | undefined, language?: string | undefined, sort?: string | undefined, 'providers.ids'?: string | undefined, 'providers.subject'?: string | undefined};

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

export const thingReduced = z.object({type: z.string().optional(), uri: z.string().optional(), id: z.string().optional(), label: z.string().optional()});

export const getApiCResponse = z.array(thingReduced);

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
};

/**
 * Search concepts or collections.
 * 
 * GET /c
 */
export const getApiC = async (args: GetApiCArgs, options: GetApiCOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

if (args.type != null) query.append("type", String(args.type))
if (args.mode != null) query.append("mode", String(args.mode))
if (args.label != null) query.append("label", String(args.label))
if (args.language != null) query.append("language", String(args.language))
if (args.sort != null) query.append("sort", String(args.sort))
if (args['providers.ids'] != null) query.append("providers.ids", String(args['providers.ids']))
if (args['providers.subject'] != null) query.append("providers.subject", String(args['providers.subject']))

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