import {z} from 'zod'

export type WidgetEventRequest = {event_name: 'WIDGET_LOAD' | 'WIDGET_DISPLAY' | 'WIDGET_VIEW' | 'BRAND_DISPLAY' | 'BRAND_VIEW' | 'BRAND_CLICK' | 'PRODUCT_DISPLAY' | 'PRODUCT_VIEW' | 'PRODUCT_CLICK' | 'ELEMENT_CLICK', event_datetime: string, session_id: string};

export type BrandEventProperties = {offer_id: string, advertiser_id: string, insertion_id: string};

export type ElementClickRequest = {event_name: 'WIDGET_LOAD' | 'WIDGET_DISPLAY' | 'WIDGET_VIEW' | 'BRAND_DISPLAY' | 'BRAND_VIEW' | 'BRAND_CLICK' | 'PRODUCT_DISPLAY' | 'PRODUCT_VIEW' | 'PRODUCT_CLICK' | 'ELEMENT_CLICK', event_datetime: string, session_id: string, initiating_target: 'INLINE_NAV_FORWARD' | 'INLINE_NAV_BACKWARD' | 'INLINE_FOOTER_DISCO' | 'INLINE_FOOTER_PRIVACY', brand_properties?: BrandEventProperties | undefined};

export type BrandDisplayRequest = {event_name: 'WIDGET_LOAD' | 'WIDGET_DISPLAY' | 'WIDGET_VIEW' | 'BRAND_DISPLAY' | 'BRAND_VIEW' | 'BRAND_CLICK' | 'PRODUCT_DISPLAY' | 'PRODUCT_VIEW' | 'PRODUCT_CLICK' | 'ELEMENT_CLICK', event_datetime: string, session_id: string, initiating_target: 'INLINE_SLOT', brand_properties: BrandEventProperties};

export type BrandClickRequest = {event_name: 'WIDGET_LOAD' | 'WIDGET_DISPLAY' | 'WIDGET_VIEW' | 'BRAND_DISPLAY' | 'BRAND_VIEW' | 'BRAND_CLICK' | 'PRODUCT_DISPLAY' | 'PRODUCT_VIEW' | 'PRODUCT_CLICK' | 'ELEMENT_CLICK', event_datetime: string, session_id: string, initiating_target: 'INLINE_ACTION_BUTTON' | 'INLINE_ASSET_TILE', asset_id?: string | undefined, brand_properties: BrandEventProperties};

export type EventRequest = WidgetEventRequest | ElementClickRequest | BrandDisplayRequest | BrandClickRequest;

export type BatchEventRequest = {events: Array<EventRequest>};

export type CreateApiEventsBatchArgs = {version: string, body: BatchEventRequest};

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

export const batchEventResult = z.object({index: z.number().int(), success: z.boolean()});

export const batchEventResponse = z.object({results: z.array(batchEventResult), accepted: z.number().int(), failed: z.number().int()});

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 batch of events used to record user actions
 * 
 * POST /events/batch
 */
export const createApiEventsBatch = async (args: CreateApiEventsBatchArgs, options?: CreateApiEventsBatchOptions) => {
const {baseUrl = "https://partners.disconetwork.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.version != null) headers.set("version", String(args.version))

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