feat(shopping): listShoppingList konsolidiert g/kg + ml/l

TS-seitige Family-Gruppierung via unitFamily() + consolidate() ersetzt
die reine SQL-Aggregation. unit_key im ShoppingListRow traegt jetzt den
Family-Key ('weight', 'volume' oder raw-unit). toggleCheck-Aufrufe und
unit_key-Assertions in den Tests entsprechend angepasst.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/lib/server/shopping/repository.ts

@@ -1,4 +1,5 @@
 import type Database from 'better-sqlite3';
+import { consolidate, unitFamily } from '../unit-consolidation';
 
 // Fallback when a recipe has no servings_default set — matches the default
 // used by RecipeEditor's "new recipe" template.
@@ -80,7 +81,18 @@ export function listShoppingList(
     )
     .all() as ShoppingCartRecipe[];
 
-  const rows = db
+  // SQL aggregates per (name, raw-unit). Family-grouping + consolidation is
+  // done in TypeScript so SQL stays readable and the logic is unit-testable.
+  type RawRow = {
+    name_key: string;
+    unit_key: string;
+    display_name: string;
+    display_unit: string | null;
+    total_quantity: number | null;
+    from_recipes: string;
+  };
+
+  const raw = db
     .prepare(
       `SELECT
          LOWER(TRIM(i.name)) AS name_key,
@@ -88,19 +100,60 @@ export function listShoppingList(
          MIN(i.name) AS display_name,
          MIN(i.unit) AS display_unit,
          SUM(i.quantity * cr.servings * 1.0 / NULLIF(COALESCE(r.servings_default, cr.servings), 0)) AS total_quantity,
-         GROUP_CONCAT(DISTINCT r.title) AS from_recipes,
-         EXISTS(
-           SELECT 1 FROM shopping_cart_check c
-            WHERE c.name_key = LOWER(TRIM(i.name))
-              AND c.unit_key = LOWER(TRIM(COALESCE(i.unit, '')))
-         ) AS checked
+         GROUP_CONCAT(DISTINCT r.title) AS from_recipes
        FROM shopping_cart_recipe cr
        JOIN recipe r ON r.id = cr.recipe_id
        JOIN ingredient i ON i.recipe_id = r.id
-       GROUP BY name_key, unit_key
-       ORDER BY checked ASC, display_name COLLATE NOCASE`
+       GROUP BY name_key, unit_key`
     )
-    .all() as ShoppingListRow[];
+    .all() as RawRow[];
+
+  // Load all checked keys up front
+  const checkedSet = new Set(
+    (
+      db
+        .prepare('SELECT name_key, unit_key FROM shopping_cart_check')
+        .all() as { name_key: string; unit_key: string }[]
+    ).map((c) => `${c.name_key}|${c.unit_key}`)
+  );
+
+  // Group by (name_key, unitFamily(unit_key))
+  const grouped = new Map<string, RawRow[]>();
+  for (const r of raw) {
+    const familyKey = unitFamily(r.unit_key);
+    const key = `${r.name_key}|${familyKey}`;
+    const arr = grouped.get(key) ?? [];
+    arr.push(r);
+    grouped.set(key, arr);
+  }
+
+  const rows: ShoppingListRow[] = [];
+  for (const [key, members] of grouped) {
+    const [nameKey, familyKey] = key.split('|');
+    const consolidated = consolidate(
+      members.map((m) => ({ quantity: m.total_quantity, unit: m.display_unit }))
+    );
+    const displayName = members[0].display_name;
+    const allRecipes = new Set<string>();
+    for (const m of members) {
+      for (const t of m.from_recipes.split(',')) allRecipes.add(t);
+    }
+    rows.push({
+      name_key: nameKey,
+      unit_key: familyKey,
+      display_name: displayName,
+      display_unit: consolidated.unit,
+      total_quantity: consolidated.quantity,
+      from_recipes: [...allRecipes].join(','),
+      checked: checkedSet.has(`${nameKey}|${familyKey}`) ? 1 : 0
+    });
+  }
+
+  // Sort: unchecked first, then alphabetically by display_name
+  rows.sort((a, b) => {
+    if (a.checked !== b.checked) return a.checked - b.checked;
+    return a.display_name.localeCompare(b.display_name, 'de', { sensitivity: 'base' });
+  });
 
   const uncheckedCount = rows.reduce((n, r) => n + (r.checked ? 0 : 1), 0);
   return { recipes, rows, uncheckedCount };

tests/integration/shopping-repository.test.ts

@@ -123,7 +123,7 @@ describe('listShoppingList aggregation', () => {
     const rows = listShoppingList(db).rows;
     expect(rows).toHaveLength(1);
     expect(rows[0].name_key).toBe('mehl');
-    expect(rows[0].unit_key).toBe('g');
+    expect(rows[0].unit_key).toBe('weight');
     expect(rows[0].total_quantity).toBe(400);
     expect(rows[0].from_recipes).toContain('Carbonara');
     expect(rows[0].from_recipes).toContain('Lasagne');
@@ -201,15 +201,15 @@ describe('toggleCheck', () => {
 
   it('marks a row as checked', () => {
     const { db } = setupOneRowCart();
-    toggleCheck(db, 'mehl', 'g', true);
+    toggleCheck(db, 'mehl', 'weight', true);
     const rows = listShoppingList(db).rows;
     expect(rows[0].checked).toBe(1);
   });
 
   it('unchecks a row when passed false', () => {
     const { db } = setupOneRowCart();
-    toggleCheck(db, 'mehl', 'g', true);
-    toggleCheck(db, 'mehl', 'g', false);
+    toggleCheck(db, 'mehl', 'weight', true);
+    toggleCheck(db, 'mehl', 'weight', false);
     expect(listShoppingList(db).rows[0].checked).toBe(0);
   });
 
@@ -225,7 +225,7 @@ describe('toggleCheck', () => {
     }));
     addRecipeToCart(db, a, null);
     addRecipeToCart(db, b, null);
-    toggleCheck(db, 'mehl', 'g', true);
+    toggleCheck(db, 'mehl', 'weight', true);
     // Rezept A weg, Mehl kommt noch aus B — check bleibt, mit neuer Menge
     removeRecipeFromCart(db, a);
     const rows = listShoppingList(db).rows;
@@ -304,3 +304,116 @@ describe('clearCart', () => {
     expect(anyCheck).toBeUndefined();
   });
 });
+
+describe('listShoppingList — Konsolidierung ueber Einheiten', () => {
+  it('fasst 500 g + 1 kg Kartoffeln zu 1,5 kg zusammen', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'Kartoffelsuppe',
+        servings_default: 4,
+        ingredients: [
+          { position: 1, name: 'Kartoffeln', quantity: 500, unit: 'g', note: null, raw_text: '', section_heading: null }
+        ]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'Kartoffelpuffer',
+        servings_default: 4,
+        ingredients: [
+          { position: 1, name: 'Kartoffeln', quantity: 1, unit: 'kg', note: null, raw_text: '', section_heading: null }
+        ]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const snap = listShoppingList(db);
+    const kartoffeln = snap.rows.filter((r) => r.display_name.toLowerCase() === 'kartoffeln');
+    expect(kartoffeln).toHaveLength(1);
+    expect(kartoffeln[0].total_quantity).toBe(1.5);
+    expect(kartoffeln[0].display_unit).toBe('kg');
+  });
+
+  it('kombiniert ml + l korrekt (400 ml + 0,5 l → 900 ml)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Milch', quantity: 400, unit: 'ml', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Milch', quantity: 0.5, unit: 'l', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const milch = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'milch');
+    expect(milch).toHaveLength(1);
+    expect(milch[0].total_quantity).toBe(900);
+    expect(milch[0].display_unit).toBe('ml');
+  });
+
+  it('laesst inkompatible Families getrennt (5 Stueck Eier + 500 g Eier = 2 Zeilen)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Eier', quantity: 5, unit: 'Stück', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Eier', quantity: 500, unit: 'g', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const eier = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'eier');
+    expect(eier).toHaveLength(2);
+  });
+
+  it('summiert gleiche Unit-Family ohne Konversion (2 Bund + 1 Bund → 3 Bund)', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(
+      db,
+      recipe({
+        title: 'R1',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Petersilie', quantity: 2, unit: 'Bund', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    const b = insertRecipe(
+      db,
+      recipe({
+        title: 'R2',
+        servings_default: 4,
+        ingredients: [{ position: 1, name: 'Petersilie', quantity: 1, unit: 'Bund', note: null, raw_text: '', section_heading: null }]
+      })
+    );
+    addRecipeToCart(db, a, null);
+    addRecipeToCart(db, b, null);
+
+    const petersilie = listShoppingList(db).rows.filter((r) => r.display_name.toLowerCase() === 'petersilie');
+    expect(petersilie).toHaveLength(1);
+    expect(petersilie[0].total_quantity).toBe(3);
+    expect(petersilie[0].display_unit?.toLowerCase()).toBe('bund');
+  });
+});