import {z} from 'zod'

export type Element = {id: number, payload?: {[key: string]: unknown} | undefined, score: number, tie_breaker?: number | undefined};

export type ListPayloadQL = {all_in_sets?: Array<string> | undefined, lists?: Array<string> | undefined, match_metadata?: {[key: string]: unknown} | undefined, payload?: Array<Element> | undefined};

export type CreateApiXlistElementsArgs = {errors_only?: boolean | undefined, results?: boolean | undefined, body: ListPayloadQL};

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

export const rankdbResultlist = z.object({errors: z.record(z.string(), z.unknown()).optional(), success: z.record(z.string(), z.unknown()).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
};

/**
 * Create elements in multiple lists
 * 
 * POST /xlist/elements
 */
export const createApiXlistElements = async (args: CreateApiXlistElementsArgs, options: CreateApiXlistElementsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, jwt} = options ?? {}

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

if (args.errors_only != null) query.append("errors_only", String(args.errors_only))
if (args.results != null) query.append("results", String(args.results))
if (jwt !== undefined) headers.set("Authorization", jwt)

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