import {z} from 'zod'

export type ExternalIdPayments = string;

export type CustomerIdPaymentWidget = string;

export type CustomerPaymentWidget = {identifier: string, name?: string | undefined, external_id?: ExternalIdPayments | undefined};

export type EnrollmentBiometricPaymentWidget = {type: 'open_finance_biometric_pix', external_id?: ExternalIdPayments | undefined, details: {name?: string | undefined, customer: CustomerIdPaymentWidget | CustomerPaymentWidget, institution?: string | undefined}, metadata: Record<string, never>};

export type IndividualRequestBiometricPix = {open_finance_biometric_pix: {beneficiary_bank_account: string, enrollment?: string | undefined}};

export type PaymentIntentBiometricWidget = {amount: string, external_id?: ExternalIdPayments | undefined, description: string, statement_description?: string | undefined, allowed_payment_method_types: Array<'open_finance_biometric_pix'>, payment_method_details: IndividualRequestBiometricPix, metadata: Record<string, never>};

export type CallbackUrlsBiometricPaymentWidget = {success: string, exit: string};

export type BrandingBiometricWidget = {color_scheme?: ('LIGHT' | 'DARK') | undefined, company_name: string};

export type ThemeBiometricWidget = {css_key: string, value: string};

export type BiometricPaymentWidgetRequest = {use_cases: Array<'ENROLLMENT' | 'PAYMENT_INTENT'>, widget: {enrollment?: EnrollmentBiometricPaymentWidget | undefined, payment_intent?: PaymentIntentBiometricWidget | undefined, callback_urls: CallbackUrlsBiometricPaymentWidget, branding: BrandingBiometricWidget, top_tier_institutions?: (Array<'nubank_retail' | 'inter_retail' | 'picpay_retail' | 'mercadopago_retail' | 'itau_retail' | 'santander_retail' | 'c6_retail' | 'bradesco_retail' | 'banco_do_brasil_retail' | 'sicredi_retail' | 'btg_retail' | 'caixa_retail' | 'pan_retail' | 'pagseguro_retail'>) | undefined, theme?: Array<ThemeBiometricWidget> | undefined}};

export type CreateApiPaymentsBrTokenArgs = {body: BiometricPaymentWidgetRequest};

export type CreateApiPaymentsBrTokenOptions = {baseUrl?: string | undefined, basicAuth?: {username: string, password: string} | undefined, fetch?: typeof fetch | undefined};

export const widgetToken = z.object({access: z.string().optional(), refresh: z.string().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
};

/**
 * Generate a payment widget access token
 * 
 * POST /payments/br/token/
 */
export const createApiPaymentsBrToken = async (args: CreateApiPaymentsBrTokenArgs, options?: CreateApiPaymentsBrTokenOptions) => {
const {baseUrl = "https://sandbox.belvo.com", fetch: fetchFn = fetch, basicAuth} = options ?? {}

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

if (basicAuth !== undefined) headers.set('authorization', `Basic ${btoa(`${basicAuth.username}:${basicAuth.password}`)}`)

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