import {z} from 'zod'

export type GetApiAiSearchFiltersOptions = {baseUrl?: string | undefined, ApiKeyAuth?: string | undefined, ShopId?: string | undefined, fetch?: typeof fetch | undefined};

export const region = z.enum(["US", "UK", "IT", "ES", "DE", "FR", "IE", "MX", "BR", "JP", "NL", "AT", "BE", "CZ", "GR", "HU", "PL", "PT"]);

export const filterOption = z.object({label: z.string(), value: z.string(), min: z.number().nullable().optional(), max: z.number().nullable().optional()});

export const sliderFilterConfig = z.object({min: z.number(), max: z.number(), step: z.number()});

export const filtersResponse = z.object({region: region, filters: z.record(z.string(), z.array(filterOption)), sliders: z.record(z.string(), sliderFilterConfig)});

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
};

/**
 * Valid AI-search filters for your region
 * 
 * GET /ai-search/filters
 */
export const getApiAiSearchFilters = async (options?: GetApiAiSearchFiltersOptions) => {
const {baseUrl = "https://api.reacherapp.com/public/v1", fetch: fetchFn = fetch, ApiKeyAuth, ShopId} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("x-api-key", ApiKeyAuth)
if (ShopId !== undefined) headers.set("x-shop-id", ShopId)

const url = `${baseUrl.replace(/\/+$/, '')}/ai-search/filters${query.size > 0 ? `?${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(filtersResponse, await res.json())
};