import {z} from 'zod'

export type GetApiConceptschemesSchemeIdCCIdArgs = {scheme_id: string, c_id: string};

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

export const label = z.object({type: z.string(), language: z.string(), label: z.string()});

export const note = z.object({note: z.string().optional(), type: z.string().optional(), language: z.string().optional(), markup: z.string().nullable().optional()});

export const source = z.object({citation: z.string().optional(), markup: z.string().nullable().optional()});

export const matchList = z.array(z.string());

export const matches = z.object({broad: matchList.optional(), close: matchList.optional(), exact: matchList.optional(), narrow: matchList.optional(), related: matchList.optional()});

export const conceptDetail = z.object({id: z.string().optional(), type: z.literal("concept"), labels: z.array(label), notes: z.array(note).optional(), sources: z.array(source).optional(), member_of: z.array(z.object({id: z.string().optional()})).optional(), related: z.array(z.object({id: z.string().optional()})).optional(), broader: z.array(z.object({id: z.string().optional()})).optional(), narrower: z.array(z.object({id: z.string().optional()})).optional(), matches: matches.optional(), subordinate_arrays: z.array(z.object({id: z.string().optional()})).optional(), label: z.string().optional(), uri: z.string().optional(), concept_scheme: z.object({uri: z.string().optional(), labels: z.array(label).optional()}).optional()});

export const collectionDetail = z.object({id: z.string().optional(), type: z.literal("collection"), labels: z.array(label), notes: z.array(note).optional(), sources: z.array(source).optional(), member_of: z.array(z.object({id: z.string().optional()})).optional(), members: z.array(z.object({id: z.string().optional()})).optional(), superordinates: z.array(z.object({id: z.string().optional()})).optional(), infer_concept_relations: z.boolean().optional(), label: z.string().optional(), uri: z.string().optional()});

export const thingDetail = z.union([conceptDetail, collectionDetail]);

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 information about a concept or collection.
 * 
 * GET /conceptschemes/{scheme_id}/c/{c_id}
 */
export const getApiConceptschemesSchemeIdCCId = async (args: GetApiConceptschemesSchemeIdCCIdArgs, options: GetApiConceptschemesSchemeIdCCIdOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

const url = `${baseUrl.replace(/\/+$/, '')}/conceptschemes/${encodeURIComponent(String(args.scheme_id))}/c/${encodeURIComponent(String(args.c_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(thingDetail, await res.json())
};