import {z} from 'zod'

export type NELRequest = {query: string, ontology: string, version: string, top_k?: number | undefined, metadata?: {[key: string]: unknown} | undefined, request_id?: (string | null) | undefined};

export type CreateApiMedLinkNelLinkArgs = {body: NELRequest};

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

export const nELResult = z.object({term_id: z.string(), term_name: z.string(), score: z.number().nullable().optional(), is_linked: z.boolean().optional(), metadata: z.record(z.string(), z.unknown()).nullable().optional()});

export const nELResponse = z.object({request_id: z.string(), query: z.string(), query_breakdown: z.record(z.string(), z.unknown()).nullable().optional(), results: z.array(nELResult), ontology: z.string(), version: z.string(), index_name: z.string(), model_version: z.string().nullable().optional()});

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
};

/**
 * Link entity
 * 
 * POST /med-link/nel/link
 */
export const createApiMedLinkNelLink = async (args: CreateApiMedLinkNelLinkArgs, options?: CreateApiMedLinkNelLinkOptions) => {
const {baseUrl = "https://api.eka.care", fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/med-link/nel/link${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(nELResponse, await res.json())
};