import {z} from 'zod'

export type DateField = {date?: string | undefined, op?: ('GT' | 'GTE' | 'LT' | 'LTE' | 'EQ') | undefined};

export type LastModifiedDate = {from?: DateField | undefined, to?: DateField | undefined} | null;

export type SortField = {field?: string | undefined, desc?: boolean | undefined} | null;

export type FetchFields = {include?: Array<string> | undefined, exclude?: Array<string> | undefined} | null;

export type ItemFetchRequest = {gtins?: Array<string> | undefined, pullHierarchy?: (boolean | null) | undefined, gtin?: (Array<string | null> | null) | undefined, ipGln?: (unknown | null) | undefined, targetMarket?: (string | null) | undefined, lastModifiedDate?: LastModifiedDate | undefined, brandName?: (string | null) | undefined, productType?: (string | null) | undefined, isConsumerUnit?: (string | null) | undefined, gpcCode?: (string | null) | undefined, upcCode?: (string | null) | undefined, sortFields?: (Array<SortField> | null) | undefined, fields?: FetchFields | undefined, searchAfter?: (Array<Record<string, never> | null> | null) | undefined};

export type CreateApiV1ProductCountArgs = {appid: string, hashcode: string, timestamp: string, gln: unknown, body: ItemFetchRequest};

export type CreateApiV1ProductCountOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const itemCount = z.object({count: z.number().int().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
};

/**
 * This method will return product count for a given search criteria.
 * 
 * POST /V1/product/count
 */
export const createApiV1ProductCount = async (args: CreateApiV1ProductCountArgs, options?: CreateApiV1ProductCountOptions) => {
const {baseUrl = "https://content1-api.1worldsync.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.appid != null) headers.set("appid", String(args.appid))
if (args.hashcode != null) headers.set("hashcode", String(args.hashcode))
if (args.timestamp != null) query.append("timestamp", String(args.timestamp))
if (args.gln != null) headers.set("gln", String(args.gln))

const url = `${baseUrl.replace(/\/+$/, '')}/V1/product/count${query.size > 0 ? `?${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(itemCount, await res.json())
};