import {z} from 'zod'

export type CreateAttachmentUploadRequest = {fileName: string, contentType: string, sizeBytes: number | unknown, clientId?: (string | null) | undefined};

export type CreateApiMessageAttachmentsUploadUrlArgs = {body: CreateAttachmentUploadRequest};

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

export const attachmentUploadTicketDto = z.object({uploadUrl: z.string(), expiresAt: z.string(), attachmentId: z.string(), fileName: z.string(), contentType: z.string(), sizeBytes: z.union([z.number().int(), z.string()])});

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
};

/**
 * A presigned PUT for one file. The type and size are checked here so the composer can say
 * no before uploading; they are checked again against the stored bytes at send time, since
 * a presigned PUT can't enforce either.
 * 
 * POST /message-attachments/upload-url
 */
export const createApiMessageAttachmentsUploadUrl = async (args: CreateApiMessageAttachmentsUploadUrlArgs, options?: CreateApiMessageAttachmentsUploadUrlOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

if (Bearer !== undefined) headers.set('authorization', `Bearer ${Bearer}`)

const url = `${baseUrl.replace(/\/+$/, '')}/message-attachments/upload-url${query.size > 0 ? `?${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(attachmentUploadTicketDto, await res.json())
};