import {z} from 'zod'

export type Currency = 'EUR';

export type VoucherScheme = string;

export type VoucherEligibleAmount = {voucherSchemes: Array<VoucherScheme>, amount: number};

export type PaymentCreateRequest = {reference?: string | undefined, bulkId?: string | undefined, amount: number, currency?: Currency | undefined, description?: string | undefined, identifyCallbackUrl?: string | undefined, callbackUrl?: string | undefined, returnUrl?: string | undefined, voucherEligibility?: Array<VoucherEligibleAmount> | undefined};

export type CreateApiV3PaymentsArgs = {body: PaymentCreateRequest};

export type CreateApiV3PaymentsOptions = {baseUrl?: string | undefined, apiKeyPaymentProfile?: string | undefined, fetch?: typeof fetch | undefined};

export const currency = z.literal("EUR");

export const paymentCreditorResponse = z.object({profileId: z.string().optional(), merchantId: z.string().optional(), name: z.string().optional(), iban: z.string().optional(), identifyCallbackUrl: z.string().optional(), callbackUrl: z.string().optional()});

export const link = z.object({href: z.string()});

export const links = z.object({self: link, deeplink: link, qrcode: link, cancel: link.optional(), refund: link.optional(), checkout: link.optional()});

export const paymentCreateResponse = z.object({paymentId: z.string().min(24).max(24), status: z.literal("PENDING"), createdAt: z.string(), expiresAt: z.string(), description: z.string().optional(), reference: z.string().optional(), amount: z.number().int().gt(1).lte(999999999999), currency: currency, creditor: paymentCreditorResponse, _links: links});

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 a payment
 * 
 * POST /v3/payments
 * 
 * Also accepts auth: JWS-Request-Signature-Payment
 */
export const createApiV3Payments = async (args: CreateApiV3PaymentsArgs, options?: CreateApiV3PaymentsOptions) => {
const {baseUrl = "https://merchant.api.preprod.bancontact.net", fetch: fetchFn = fetch, apiKeyPaymentProfile} = options ?? {}

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

if (apiKeyPaymentProfile !== undefined) headers.set("Authorization", apiKeyPaymentProfile)

const url = `${baseUrl.replace(/\/+$/, '')}/v3/payments${query.size > 0 ? `?${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(paymentCreateResponse, await res.json())
};