// server/supabase/functions/_shared/json-response.ts
// JSON response + auth-error mapping shared by the knowledge functions.

import { corsHeaders } from './cors.ts'
import type { AuthError } from './auth.ts'

export function jsonResponse(status: number, body: Record<string, unknown>): Response {
  return new Response(JSON.stringify(body), {
    status,
    headers: { ...corsHeaders, 'Content-Type': 'application/json' },
  })
}

export function isAuthError(error: unknown): error is AuthError {
  return Boolean(
    error
    && typeof error === 'object'
    && 'status' in error
    && (error.status === 401 || error.status === 403)
    && 'message' in error
    && typeof error.message === 'string',
  )
}

/** Map a thrown value to a response: auth errors keep their status, anything else is a 500. */
export function errorResponse(error: unknown): Response {
  // Same shape as auth.ts authErrorResponse, without loading the Supabase client.
  if (isAuthError(error)) return jsonResponse(error.status, { error: error.message })
  return jsonResponse(500, { error: 'internal_error' })
}