feat(shopping): listShoppingList mit Aggregation + Skalierung

src/lib/server/shopping/repository.ts

@@ -67,7 +67,9 @@ export function setCartServings(
   ).run(servings, recipeId);
 }
 
-export function listShoppingList(db: Database.Database): ShoppingListSnapshot {
+export function listShoppingList(
+  db: Database.Database
+): ShoppingListSnapshot {
   const recipes = db
     .prepare(
       `SELECT cr.recipe_id, r.title, r.image_path, cr.servings,
@@ -77,9 +79,31 @@ export function listShoppingList(db: Database.Database): ShoppingListSnapshot {
         ORDER BY cr.added_at ASC`
     )
     .all() as ShoppingCartRecipe[];
-  // TODO(Task 6): rows + uncheckedCount are populated by the aggregation query.
-  // Until then, callers must not rely on these fields.
-  return { recipes, rows: [], uncheckedCount: 0 };
+
+  const rows = db
+    .prepare(
+      `SELECT
+         LOWER(TRIM(i.name)) AS name_key,
+         LOWER(TRIM(COALESCE(i.unit, ''))) AS unit_key,
+         MIN(i.name) AS display_name,
+         MIN(i.unit) AS display_unit,
+         SUM(i.quantity * cr.servings * 1.0 / COALESCE(r.servings_default, cr.servings)) 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
+       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`
+    )
+    .all() as ShoppingListRow[];
+
+  const uncheckedCount = rows.reduce((n, r) => n + (r.checked ? 0 : 1), 0);
+  return { recipes, rows, uncheckedCount };
 }
 
 export function toggleCheck(

tests/integration/shopping-repository.test.ts

@@ -103,3 +103,73 @@ describe('setCartServings', () => {
     expect(() => setCartServings(db, id, -3)).toThrow();
   });
 });
+
+describe('listShoppingList aggregation', () => {
+  it('aggregates same name+unit across recipes', () => {
+    const db = openInMemoryForTest();
+    const a = insertRecipe(db, recipe({
+      title: 'Carbonara', servings_default: 4,
+      ingredients: [{ position: 1, quantity: 200, unit: 'g', name: 'Mehl', note: null, raw_text: '', section_heading: null }]
+    }));
+    const b = insertRecipe(db, recipe({
+      title: 'Lasagne', servings_default: 4,
+      ingredients: [{ position: 1, quantity: 200, unit: 'g', name: 'Mehl', note: null, raw_text: '', section_heading: null }]
+    }));
+    addRecipeToCart(db, a, null, 4);
+    addRecipeToCart(db, b, null, 4);
+    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].total_quantity).toBe(400);
+    expect(rows[0].from_recipes).toContain('Carbonara');
+    expect(rows[0].from_recipes).toContain('Lasagne');
+  });
+
+  it('keeps different units as separate rows', () => {
+    const db = openInMemoryForTest();
+    const id = insertRecipe(db, recipe({
+      servings_default: 4,
+      ingredients: [
+        { position: 1, quantity: 100, unit: 'g', name: 'Mehl', note: null, raw_text: '', section_heading: null },
+        { position: 2, quantity: 1, unit: 'Pck', name: 'Mehl', note: null, raw_text: '', section_heading: null }
+      ]
+    }));
+    addRecipeToCart(db, id, null, 4);
+    const rows = listShoppingList(db).rows;
+    expect(rows).toHaveLength(2);
+  });
+
+  it('scales quantities by servings/servings_default', () => {
+    const db = openInMemoryForTest();
+    const id = insertRecipe(db, recipe({
+      servings_default: 4,
+      ingredients: [{ position: 1, quantity: 200, unit: 'g', name: 'Mehl', note: null, raw_text: '', section_heading: null }]
+    }));
+    addRecipeToCart(db, id, null, 2);
+    expect(listShoppingList(db).rows[0].total_quantity).toBe(100);
+  });
+
+  it('null quantity stays null after aggregation', () => {
+    const db = openInMemoryForTest();
+    const id = insertRecipe(db, recipe({
+      ingredients: [{ position: 1, quantity: null, unit: null, name: 'Salz', note: null, raw_text: '', section_heading: null }]
+    }));
+    addRecipeToCart(db, id, null);
+    const rows = listShoppingList(db).rows;
+    expect(rows[0].total_quantity).toBeNull();
+    expect(rows[0].unit_key).toBe('');
+  });
+
+  it('counts unchecked rows in uncheckedCount', () => {
+    const db = openInMemoryForTest();
+    const id = insertRecipe(db, recipe({
+      ingredients: [
+        { position: 1, quantity: 1, unit: 'Stk', name: 'Apfel', note: null, raw_text: '', section_heading: null },
+        { position: 2, quantity: 1, unit: 'Stk', name: 'Birne', note: null, raw_text: '', section_heading: null }
+      ]
+    }));
+    addRecipeToCart(db, id, null);
+    expect(listShoppingList(db).uncheckedCount).toBe(2);
+  });
+});