import {z} from 'zod'

export type MessageHeader = {Name?: string | undefined, Value?: string | undefined};

export type HeaderCollection = Array<MessageHeader>;

export type Attachment = {Name?: string | undefined, Content?: string | undefined, ContentType?: string | undefined, ContentID?: string | undefined};

export type AttachmentCollection = Array<Attachment>;

export type EmailWithTemplateRequest = {TemplateId: number, TemplateAlias: string, TemplateModel: Record<string, never>, InlineCss?: boolean | undefined, From: string, To: string, Cc?: string | undefined, Bcc?: string | undefined, Tag?: string | undefined, ReplyTo?: string | undefined, Headers?: HeaderCollection | undefined, TrackOpens?: boolean | undefined, TrackLinks?: ('None' | 'HtmlAndText' | 'HtmlOnly' | 'TextOnly') | undefined, Attachments?: AttachmentCollection | undefined};

export type SendEmailTemplatedBatchRequest = {Messages?: Array<EmailWithTemplateRequest> | undefined};

export type CreateApiEmailBatchWithTemplatesArgs = {'X-Postmark-Server-Token': string, body: SendEmailTemplatedBatchRequest};

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

export const sendEmailResponse = z.object({To: z.string().optional(), SubmittedAt: z.string().optional(), MessageID: z.string().optional(), ErrorCode: z.number().int().optional(), Message: z.string().optional()});

export const sendEmailBatchResponse = z.array(sendEmailResponse);

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 a batch of email using templates.
 * 
 * POST /email/batchWithTemplates
 */
export const createApiEmailBatchWithTemplates = async (args: CreateApiEmailBatchWithTemplatesArgs, options: CreateApiEmailBatchWithTemplatesOptions) => {
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")

if (args['X-Postmark-Server-Token'] != null) headers.set("X-Postmark-Server-Token", String(args['X-Postmark-Server-Token']))

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