import {z} from 'zod'

export type CreateApiAttachmentsOptions = {baseUrl?: string | undefined, oauth2?: string | undefined, fetch?: typeof fetch | undefined};

export const links = z.object({href: z.string(), rel: z.string(), type: z.enum(["GET", "POST", "PUT", "PATCH"])});

export const file = z.object({id: z.number(), companyId: z.number(), entityType: z.enum(["customer", "job", "site", "enquiry", "job_phase", "form", "certificate"]), entityId: z.number(), fileGuid: z.string(), fileName: z.string(), fileSize: z.number(), mimeType: z.string(), createdBy: z.number().nullable(), createdAt: z.string(), links: z.array(links)});

export const createApiAttachmentsResponse = z.object({result: z.string(), data: file});

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
};

/**
 * Upload a file and attach it to an entity in a single atomic operation. Send as multipart/form-data with `file`, `entityType`, and `entityId` fields. Maximum file size: 20 MB.
 * 
 * POST /attachments
 * 
 * Also accepts auth: PersonalAccessToken
 */
export const createApiAttachments = async (options?: CreateApiAttachmentsOptions) => {
const {baseUrl = "https://api.fergus.com", fetch: fetchFn = fetch, oauth2} = options ?? {}

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

if (oauth2 !== undefined) headers.set('authorization', `Bearer ${oauth2}`)

const url = `${baseUrl.replace(/\/+$/, '')}/attachments${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(createApiAttachmentsResponse, await res.json())
};