import {z} from 'zod'

export type Invite = {questionnaireTemplate: {id: string}, template: {id: string}, customer: {firstName?: string | undefined, lastName?: string | undefined, email: string}, locale?: string | undefined, transaction: {reference: string, date?: string | undefined}, products?: (Array<{gtin?: string | undefined, imageUrl?: string | undefined, name: string, mpn?: string | undefined, sku: string, brand?: string | undefined, url: string}>) | undefined, preferredSendTime?: string | undefined, metadata?: Record<string, never> | undefined};

export type InvitesRequest = {channel: {id: string, type?: ('user_defined' | 'etrusted') | undefined}, system: string, systemVersion: string, invites: Array<Invite>};

export type CreateApiInvitesArgs = {body: InvitesRequest};

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

export const invite = z.object({questionnaireTemplate: z.object({id: z.string()}), template: z.object({id: z.string()}), customer: z.object({firstName: z.string().optional(), lastName: z.string().optional(), email: z.string()}), locale: z.string().optional(), transaction: z.object({reference: z.string(), date: z.string().optional()}), products: z.array(z.object({gtin: z.string().optional(), imageUrl: z.string().optional(), name: z.string(), mpn: z.string().optional(), sku: z.string(), brand: z.string().optional(), url: z.string()})).optional(), preferredSendTime: z.string().optional(), metadata: z.object({}).optional()});

export const failedInvite = z.object({initialInvite: invite, status: z.number().int(), reasons: z.array(z.string())});

export const invitesResponse = z.object({batchId: z.string().optional(), successfulInvites: z.number().int(), failedInvites: z.array(failedInvite).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
};

/**
 * Schedule new invites
 * 
 * POST /invites
 */
export const createApiInvites = async (args: CreateApiInvitesArgs, options: CreateApiInvitesOptions) => {
const {baseUrl, fetch: fetchFn = fetch} = options ?? {}

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

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