import {z} from 'zod'

export type CreateApiCheckoutV2IntentArgs = {Authorization?: string | undefined, 'x-onramper-signature': string, 'x-onramper-timestamp': string, 'x-onramper-nonce': string, body: {onramp: string, source: string, destination: string, amount: number, type: 'buy' | 'sell', paymentMethod: string, network?: string | undefined, endUserIpHash: string, clientIpHash?: string | undefined, platform?: ('web' | 'mobile-ios' | 'mobile-android' | 'webview-ios' | 'webview-android' | 'browser-extension' | 'desktop') | undefined, wallet?: ({address: string, memo?: string | undefined}) | undefined, country?: string | undefined, subdivision?: string | undefined, email?: string | undefined, partnerContext?: string | undefined, externalCustomerId?: string | undefined, uuid?: string | undefined, originatingHost?: string | undefined, allowOnrampPmSelection?: boolean | undefined, targetContractAddress?: string | undefined, supportedParams?: {[key: string]: unknown} | undefined, metaData?: {[key: string]: unknown} | undefined} | {[key: string]: unknown}};

export type CreateApiCheckoutV2IntentOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const createApiCheckoutV2IntentResponse = z.object({redirectUrl: z.string(), sessionId: z.string(), resumeToken: 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
};

/**
 * Initiate a Transaction (V2)
 * 
 * POST /checkout/v2/intent
 */
export const createApiCheckoutV2Intent = async (args: CreateApiCheckoutV2IntentArgs, options?: CreateApiCheckoutV2IntentOptions) => {
const {baseUrl = "https://api.onramper.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))
if (args['x-onramper-signature'] != null) headers.set("x-onramper-signature", String(args['x-onramper-signature']))
if (args['x-onramper-timestamp'] != null) headers.set("x-onramper-timestamp", String(args['x-onramper-timestamp']))
if (args['x-onramper-nonce'] != null) headers.set("x-onramper-nonce", String(args['x-onramper-nonce']))

const url = `${baseUrl.replace(/\/+$/, '')}/checkout/v2/intent${query.size > 0 ? `?${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(createApiCheckoutV2IntentResponse, await res.json())
};