import {z} from 'zod'

export type BatchSendInput = {emails: Array<{from: string, to: Array<string>, cc?: Array<string> | undefined, bcc?: Array<string> | undefined, reply_to?: string | undefined, subject?: string | undefined, html?: string | undefined, text?: string | undefined, headers?: {[key: string]: string} | undefined, tags?: Array<string> | undefined, attachments?: (Array<{filename: string, content: string, content_type?: string | undefined, content_id?: string | undefined}>) | undefined, idempotency_key?: string | undefined, scheduled_at?: (string | string) | undefined, template_id?: string | undefined, variables?: {[key: string]: string} | undefined, unsubscribe?: boolean | undefined, signature?: ('auto' | 'none') | undefined, tracking?: ({opens?: boolean | undefined, clicks?: boolean | undefined}) | undefined, idempotency_window_hours?: number | undefined}>};

export type CreateApiEmailsBatchArgs = {'Idempotency-Key'?: string | undefined, body: BatchSendInput};

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

export const batchSendResult = z.union([z.object({id: z.string(), replayed: z.boolean().optional()}), z.object({error: z.string(), code: z.string().optional()})]);

export const createApiEmailsBatchResponse = z.object({data: z.array(batchSendResult)});

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
};

/**
 * Send up to 100 emails
 * 
 * POST /emails/batch
 * 
 * Also accepts auth: bearerOAuth
 */
export const createApiEmailsBatch = async (args: CreateApiEmailsBatchArgs, options?: CreateApiEmailsBatchOptions) => {
const {baseUrl = "https://api.poststack.dev", fetch: fetchFn = fetch, bearerApiKey} = options ?? {}

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

if (args['Idempotency-Key'] != null) headers.set("Idempotency-Key", String(args['Idempotency-Key']))
if (bearerApiKey !== undefined) headers.set('authorization', `Bearer ${bearerApiKey}`)

const url = `${baseUrl.replace(/\/+$/, '')}/emails/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(createApiEmailsBatchResponse, await res.json())
};