import {z} from 'zod'

export type GetApiMerchantsArgs = {merchant_descriptor: string, match_type?: string | undefined};

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

export const country = z.object({code: z.string().optional(), name: z.string().optional()});

export const countrySubDivision = z.object({code: z.string().optional(), name: z.string().optional()});

export const address = z.object({city: z.string().optional(), country: country.optional(), countrySubdivision: countrySubDivision.optional(), line1: z.string().optional(), line2: z.string().optional(), postalCode: z.string().optional()});

export const merchant = z.object({address: address.optional(), brandName: z.string().optional(), merchantDescriptor: z.string().optional(), legalCorporateName: z.string().optional(), locationId: z.number().int().optional(), matchConfidenceScore: z.number().int().optional(), merchantCategory: z.string().optional(), merchantDbaName: z.string().optional(), phoneNumber: z.string().optional(), isBrickAndMortar: z.boolean().optional(), isEcommerce: z.boolean().optional()});

export const merchantList = z.object({merchants: z.array(merchant).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
};

/**
 * Get matched merchants for a given merchant descriptor
 * 
 * GET /merchants
 */
export const getApiMerchants = async (args: GetApiMerchantsArgs, options?: GetApiMerchantsOptions) => {
const {baseUrl = "https://api.mastercard.com/merchant-identifier", fetch: fetchFn = fetch} = options ?? {}

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

if (args.merchant_descriptor != null) query.append("merchant_descriptor", String(args.merchant_descriptor))
if (args.match_type != null) query.append("match_type", String(args.match_type))

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