data-entry-app/frontend/src/routes/mixes/[id]/+page.ts

import { error } from '@sveltejs/kit';
import { api } from '$lib/api';
import { hasStoredClientSession } from '$lib/session';

export async function load({ params, fetch }) {
  const mixId = Number(params.id);

  if (!Number.isFinite(mixId)) {
    throw error(404, 'Mix not found');
  }

  if (!hasStoredClientSession()) {
    return {
      mix: null,
      rawMaterials: []
    };
  }

  try {
    const [mix, rawMaterials] = await Promise.all([api.mix(mixId, fetch), api.rawMaterials(fetch)]);

    return {
      mix,
      rawMaterials
    };
  } catch {
    throw error(404, 'Mix not found');
  }
}