From 0f9aabe76b6324f409278109a351920a5cef103b Mon Sep 17 00:00:00 2001
From: Hendrik <hsiegeln@gmx.net>
Date: Fri, 17 Apr 2026 15:41:20 +0200
Subject: [PATCH] refactor: move scaler out of $lib/server so it can run in
 browser

RecipeView needs scaleIngredients on the client for live portion scaling.
Moved scaler.ts from $lib/server/recipes/ to $lib/recipes/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
---
 src/lib/components/RecipeView.svelte          |  2 +-
 src/lib/{server => }/recipes/scaler.ts        |  0
 src/routes/recipes/[id]/print/+page.server.ts | 23 +++++++++++++++++++
 tests/unit/scaler.test.ts                     |  2 +-
 4 files changed, 25 insertions(+), 2 deletions(-)
 rename src/lib/{server => }/recipes/scaler.ts (100%)
 create mode 100644 src/routes/recipes/[id]/print/+page.server.ts

diff --git a/src/lib/components/RecipeView.svelte b/src/lib/components/RecipeView.svelte
index c93c9d0..6b90c55 100644
--- a/src/lib/components/RecipeView.svelte
+++ b/src/lib/components/RecipeView.svelte
@@ -1,5 +1,5 @@
 <script lang="ts">
-  import { scaleIngredients } from '$lib/server/recipes/scaler';
+  import { scaleIngredients } from '$lib/recipes/scaler';
   import type { Recipe } from '$lib/types';
 
   type Props = {
diff --git a/src/lib/server/recipes/scaler.ts b/src/lib/recipes/scaler.ts
similarity index 100%
rename from src/lib/server/recipes/scaler.ts
rename to src/lib/recipes/scaler.ts
diff --git a/src/routes/recipes/[id]/print/+page.server.ts b/src/routes/recipes/[id]/print/+page.server.ts
new file mode 100644
index 0000000..078d8ec
--- /dev/null
+++ b/src/routes/recipes/[id]/print/+page.server.ts
@@ -0,0 +1,23 @@
+import type { PageServerLoad } from './$types';
+import { error } from '@sveltejs/kit';
+import { getDb } from '$lib/server/db';
+import { getRecipeById } from '$lib/server/recipes/repository';
+import { scaleIngredients } from '$lib/recipes/scaler';
+
+export const load: PageServerLoad = async ({ params, url }) => {
+  const id = Number(params.id);
+  if (!Number.isInteger(id) || id <= 0) error(400, { message: 'Invalid id' });
+  const recipe = getRecipeById(getDb(), id);
+  if (!recipe) error(404, { message: 'Nicht gefunden' });
+
+  const servingsParam = Number(url.searchParams.get('servings') ?? '');
+  const servings =
+    Number.isInteger(servingsParam) && servingsParam > 0
+      ? servingsParam
+      : (recipe.servings_default ?? 4);
+  const defaultServings = recipe.servings_default ?? 4;
+  const factor = servings / defaultServings;
+  const scaled = scaleIngredients(recipe.ingredients, factor);
+
+  return { recipe, ingredients: scaled, servings };
+};
diff --git a/tests/unit/scaler.test.ts b/tests/unit/scaler.test.ts
index ec77cd6..5edcef2 100644
--- a/tests/unit/scaler.test.ts
+++ b/tests/unit/scaler.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { scaleIngredients, roundQuantity } from '../../src/lib/server/recipes/scaler';
+import { scaleIngredients, roundQuantity } from '../../src/lib/recipes/scaler';
 import type { Ingredient } from '../../src/lib/types';
 
 const mk = (q: number | null, unit: string | null, name: string): Ingredient => ({