import {z} from 'zod'

export type GetApiSelectArgs = {q?: string | undefined, fq?: string | undefined, fl?: string | undefined, start?: number | undefined, rows?: number | undefined, wt?: ('json' | 'xml' | 'csv') | undefined};

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

export const solrResponse = z.object({responseHeader: z.object({zkConnected: z.boolean().optional(), status: z.number().int().optional(), QTime: z.number().int().optional(), params: z.object({}).optional()}).optional(), response: z.object({numFound: z.number().int().optional(), start: z.number().int().optional(), maxScore: z.number().optional(), docs: z.array(z.object({})).optional()}).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
};

/**
 * Apache Solr powered search
 * 
 * GET /select
 */
export const getApiSelect = async (args: GetApiSelectArgs, options?: GetApiSelectOptions) => {
const {baseUrl = "https://api.ideaconsult.net/nanoreg1", fetch: fetchFn = fetch} = options ?? {}

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

if (args.q != null) query.append("q", String(args.q))
if (args.fq != null) query.append("fq", String(args.fq))
if (args.fl != null) query.append("fl", String(args.fl))
if (args.start != null) query.append("start", String(args.start))
if (args.rows != null) query.append("rows", String(args.rows))
if (args.wt != null) query.append("wt", String(args.wt))

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