import {z} from 'zod'

export type EventRequest = {type: string, defaultLocale?: string | undefined, customer: {firstName?: string | undefined, lastName?: string | undefined, email: string, address?: string | undefined, mobile?: string | undefined, reference?: string | undefined}, channel: {id: string, type?: ('user_defined' | 'etrusted') | undefined}, transaction: {reference: string, date?: string | undefined}, estimatedDeliveryDate?: string | undefined, products?: (Array<{gtin?: string | undefined, imageUrl?: string | undefined, name: string, mpn?: string | undefined, sku: string, brand?: string | undefined, url: string}>) | undefined, system: string, systemVersion: string, metadata?: Record<string, never> | undefined, createdAt?: string | undefined};

export type CreateApiEventsArgs = {Authorization: string, body: EventRequest};

export type CreateApiEventsOptions = {baseUrl: string, OAuth2?: string | undefined, fetch?: typeof fetch | undefined};

export const eventPostResponse = z.object({Message: z.string().optional(), EventRef: 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
};

/**
 * Create a new event
 * 
 * POST /events
 */
export const createApiEvents = async (args: CreateApiEventsArgs, options: CreateApiEventsOptions) => {
const {baseUrl, fetch: fetchFn = fetch, OAuth2} = 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 (OAuth2 !== undefined) headers.set('authorization', `Bearer ${OAuth2}`)

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