import {z} from 'zod'

export type GetApiDataElementsWithConceptIdArgs = {graph_name: string, resource_name: string, dec_pub_id: string};

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

export const objectClass = z.object({entity: z.string(), identifier: z.string(), preferred_term: z.string()});

export const callstackItem = z.object({service: z.string(), flowStep: z.string()});

export const apiResponse = z.object({type: z.string(), message: z.string().optional(), service: z.string().optional(), time: z.string().optional(), ssnid: z.string().optional(), callStack: z.array(callstackItem).optional()});

export const dataElementswithConceptIdGETResponse = z.object({results: z.array(objectClass), apiResponse: apiResponse});

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
};

/**
 * Data Elements With A Specific Concept Id - Q19
 * 
 * GET /data_elements/with_concept_id
 */
export const getApiDataElementsWithConceptId = async (args: GetApiDataElementsWithConceptIdArgs, options?: GetApiDataElementsWithConceptIdOptions) => {
const {baseUrl = "https://cadsrapi.cancer.gov/si-api/v1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.graph_name != null) query.append("graph_name", String(args.graph_name))
if (args.resource_name != null) query.append("resource_name", String(args.resource_name))
if (args.dec_pub_id != null) query.append("dec_pub_id", String(args.dec_pub_id))

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