import {z} from 'zod'

export type GetApiTemplatesDischargeVariablesAppointmentIdArgs = {appointmentId: string};

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

export const getApiTemplatesDischargeVariablesAppointmentIdResponse = z.record(z.string(), 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
};

/**
 * The patient-record discharge variables for an appointment (ITE-1237): microchip, colour,
 * age, weight in kg and lbs, and sex with neuter/spay status, as the printed discharge fills
 * them (DischargePatientVariables). The on-screen discharge preview
 * merges these into its template context, so it no longer shows the raw tokens. A value the
 * record lacks is an empty string. 404 for an unknown appointment, including another
 * tenant's. Open to any authenticated tenant user, like GET /patients/{id}: patient
 * demographics are not a sensitive read under docs/permissions.md (Model A).
 * 
 * GET /templates/discharge-variables/{appointmentId}
 */
export const getApiTemplatesDischargeVariablesAppointmentId = async (args: GetApiTemplatesDischargeVariablesAppointmentIdArgs, options?: GetApiTemplatesDischargeVariablesAppointmentIdOptions) => {
const {baseUrl = "https://api.clinicos.vet/backend/business", fetch: fetchFn = fetch, Bearer} = options ?? {}

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

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

const url = `${baseUrl.replace(/\/+$/, '')}/templates/discharge-variables/${encodeURIComponent(String(args.appointmentId))}${query.size > 0 ? `?${query}` : ''}`

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

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

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