import {z} from 'zod'

export type CreateWidgetSessionRequest = {data: {type: 'CreateWidgetSession', attributes: {widgetType: 'PaymentMethods'}}};

export type CreateApiApiV1WidgetsSessionArgs = {'Client-ID': string, Authorization: string, body: CreateWidgetSessionRequest};

export type CreateApiApiV1WidgetsSessionOptions = {baseUrl?: string | undefined, fetch?: typeof fetch | undefined};

export const widgetSession = z.object({id: z.string(), type: z.literal("WidgetSession"), attributes: z.object({sessionToken: z.string(), createdAt: z.string()})});

export const createWidgetSessionResponse = z.object({data: widgetSession});

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 Widget Session
 * 
 * POST /api/v1/widgets/session
 */
export const createApiApiV1WidgetsSession = async (args: CreateApiApiV1WidgetsSessionArgs, options?: CreateApiApiV1WidgetsSessionOptions) => {
const {baseUrl = "https://merchant-api.accruesavings.com", fetch: fetchFn = fetch} = options ?? {}

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

if (args['Client-ID'] != null) headers.set("Client-ID", String(args['Client-ID']))
if (args.Authorization != null) headers.set("Authorization", String(args.Authorization))

const url = `${baseUrl.replace(/\/+$/, '')}/api/v1/widgets/session${query.size > 0 ? `?${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(createWidgetSessionResponse, await res.json())
};