import {z} from 'zod'

export type MediaIngest = {phone_number_id: string, source: string, delivery?: ('meta_media' | 'meta_resumable_asset') | undefined, filename?: string | undefined, mime_type?: string | undefined};

export type MediaIngestRequest = {media_ingest: MediaIngest};

export type CreateApiWhatsappMediaArgs = {body: MediaIngestRequest};

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

export const mediaIngestTarget = z.object({kind: z.enum(["meta_media", "meta_resumable_asset"]), media_id: z.string().optional(), handle: z.string().optional()});

export const mediaIngestResource = z.object({filename: z.string(), mime_type: z.string(), size_bytes: z.number().int().gte(0), sha256: z.string(), source_url: z.string()});

export const mediaIngestData = z.object({ingest_id: z.string(), target: mediaIngestTarget, resource: mediaIngestResource});

export const mediaIngestResponse = z.object({data: mediaIngestData});

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 media
 * 
 * POST /whatsapp/media
 */
export const createApiWhatsappMedia = async (args: CreateApiWhatsappMediaArgs, options?: CreateApiWhatsappMediaOptions) => {
const {baseUrl = "https://api.kapso.ai/platform/v1", fetch: fetchFn = fetch, ApiKeyAuth} = options ?? {}

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

if (ApiKeyAuth !== undefined) headers.set("X-API-Key", ApiKeyAuth)

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