import {z} from 'zod'

export type SchemasAcceptorKeyRef = string;

export type SchemasMerchantKey = string;

export type SchemasAcceptorRoute = string;

export type AcceptorResolver = {merchantAcceptorKey: SchemasAcceptorKeyRef} | {merchantKey: SchemasMerchantKey, route?: SchemasAcceptorRoute | undefined};

export type Webhook = string;

export type SchemasAmountValue = number;

export type ComponentsSchemasCurrencyCode = 'EUR';

export type SchemasAmount = {value: SchemasAmountValue, currency: ComponentsSchemasCurrencyCode};

export type CompletionUrl = string;

export type AuthenticationDescription = string;

export type InitiateBEPRequest = {merchantAcceptorResolver: AcceptorResolver, webhook: Webhook, amount: SchemasAmount, completionUrl?: CompletionUrl | undefined, description?: AuthenticationDescription | undefined};

export type CreateApiBepArgs = {body: InitiateBEPRequest};

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

export const schemasVersion = z.number().int();

export const initiateBEPResponse = z.object({bepKey: z.string(), qrCode: z.string(), bancontactIntent: z.string(), expires: z.string(), created: z.string(), version: schemasVersion});

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 BEP Authentication Intent
 * 
 * POST /bep
 * 
 * Also accepts auth: BearerToken
 */
export const createApiBep = async (args: CreateApiBepArgs, options?: CreateApiBepOptions) => {
const {baseUrl = "https://eu-west-1.api.silverflow.com/v1", fetch: fetchFn = fetch, ApiKey} = options ?? {}

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

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

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