import {z} from 'zod'

export type SendEmailRequest = {from: string, to: string | Array<string>, cc?: (string | Array<string>) | undefined, bcc?: (string | Array<string>) | undefined, subject?: string | undefined, html: string, text?: string | undefined, reply_to?: string | undefined, headers?: {[key: string]: string} | undefined, message_class?: ('transactional' | 'marketing') | undefined, draft_id?: string | undefined, reply_to_email_id?: string | undefined, thread_id?: string | undefined, labels?: Array<string> | undefined, template?: ({id: string, key?: string | undefined, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined} | {id?: string | undefined, key: string, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined}) | undefined} | {[key: string]: unknown} | {from: string, to: string | Array<string>, cc?: (string | Array<string>) | undefined, bcc?: (string | Array<string>) | undefined, subject?: string | undefined, html?: string | undefined, text: string, reply_to?: string | undefined, headers?: {[key: string]: string} | undefined, message_class?: ('transactional' | 'marketing') | undefined, draft_id?: string | undefined, reply_to_email_id?: string | undefined, thread_id?: string | undefined, labels?: Array<string> | undefined, template?: ({id: string, key?: string | undefined, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined} | {id?: string | undefined, key: string, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined}) | undefined} | {[key: string]: unknown} | {from: string, to: string | Array<string>, cc?: (string | Array<string>) | undefined, bcc?: (string | Array<string>) | undefined, subject?: string | undefined, html?: string | undefined, text?: string | undefined, reply_to?: string | undefined, headers?: {[key: string]: string} | undefined, message_class?: ('transactional' | 'marketing') | undefined, draft_id?: string | undefined, reply_to_email_id?: string | undefined, thread_id?: string | undefined, labels?: Array<string> | undefined, template: {id: string, key?: string | undefined, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined} | {id?: string | undefined, key: string, version_id?: string | undefined, versionId?: string | undefined, data?: {[key: string]: unknown} | undefined}} | {[key: string]: unknown};

export type CreateApiEmailsBatchArgs = {'Idempotency-Key'?: string | undefined, body: {emails: Array<SendEmailRequest>}};

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

export const createApiEmailsBatchResponse = z.object({data: z.array(z.object({index: z.number().int(), ok: z.boolean(), id: z.string()})), count: z.number().int(), successful: 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
};

/**
 * Send up to 100 individualized messages
 * 
 * POST /emails/batch
 */
export const createApiEmailsBatch = async (args: CreateApiEmailsBatchArgs, options?: CreateApiEmailsBatchOptions) => {
const {baseUrl = "https://sendhq.cc/api/v1", fetch: fetchFn = fetch, bearerAuth} = 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 (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

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())
};