frontend/src/routes/(app)/planner/+page.server.ts

@@ -27,6 +27,52 @@ export const load: PageServerLoad = async ({ fetch, url }) => {
 };
 
 export const actions: Actions = {
+	addSlot: async ({ fetch, request }) => {
+		const formData = await request.formData();
+		const planId = formData.get('planId') as string;
+		const slotDate = formData.get('slotDate') as string;
+		const recipeId = formData.get('recipeId') as string;
+
+		const api = apiClient(fetch);
+		const { data, error } = await api.POST('/v1/week-plans/{id}/slots', {
+			params: { path: { id: planId } },
+			body: { slotDate, recipeId }
+		});
+
+		if (error || !data) return { success: false };
+		return { success: true, slot: data };
+	},
+
+	updateSlot: async ({ fetch, request }) => {
+		const formData = await request.formData();
+		const planId = formData.get('planId') as string;
+		const slotId = formData.get('slotId') as string;
+		const recipeId = formData.get('recipeId') as string;
+
+		const api = apiClient(fetch);
+		const { data, error } = await api.PATCH('/v1/week-plans/{planId}/slots/{slotId}', {
+			params: { path: { planId, slotId } },
+			body: { recipeId }
+		});
+
+		if (error || !data) return { success: false };
+		return { success: true, slot: data };
+	},
+
+	deleteSlot: async ({ fetch, request }) => {
+		const formData = await request.formData();
+		const planId = formData.get('planId') as string;
+		const slotId = formData.get('slotId') as string;
+
+		const api = apiClient(fetch);
+		const { error } = await api.DELETE('/v1/week-plans/{planId}/slots/{slotId}', {
+			params: { path: { planId, slotId } }
+		});
+
+		if (error) return { success: false };
+		return { success: true };
+	},
+
 	createPlan: async ({ fetch, request, locals }) => {
 		// Role guard: only planners may create week plans
 		if (locals.benutzer?.rolle !== 'planer') {

frontend/src/routes/(app)/planner/+page.svelte

@@ -1,14 +1,17 @@
 <script lang="ts">
-	import { goto } from '$app/navigation';
+	import { goto, invalidateAll } from '$app/navigation';
+	import { enhance } from '$app/forms';
+	import { tick } from 'svelte';
 	import VarietyScoreCard from '$lib/planner/VarietyScoreCard.svelte';
 	import WeekStrip from '$lib/planner/WeekStrip.svelte';
 	import DayMealCard from '$lib/planner/DayMealCard.svelte';
+	import RecipePicker from '$lib/planner/RecipePicker.svelte';
+	import BottomSheet from '$lib/components/BottomSheet.svelte';
+	import UndoBar from '$lib/planner/UndoBar.svelte';
 	import { prevWeek, nextWeek, getWeekStart, weekDays, formatDayLabel, formatDayAbbr, formatWeekRange } from '$lib/planner/week';
 
-	let { data } = $props();
+	let { data, form = null }: { data: { weekPlan: any; varietyScore: any; weekStart: string }; form?: any } = $props();
 
-	// Capture initial weekStart before reactivity for $state initialization
-	const initialWeekStart: string = data.weekStart;
 	// Use UTC date string (YYYY-MM-DD) consistently
 	const today: string = new Date().toISOString().slice(0, 10);
 
@@ -21,7 +24,12 @@
 	let slotMap = $derived(Object.fromEntries(slots.map((s: any) => [s.slotDate, s])));
 
 	// Default selected day: today if in this week, else first day
-	let selectedDay = $state(weekDays(initialWeekStart).includes(today) ? today : weekDays(initialWeekStart)[0]);
+	// We read data.weekStart once synchronously here (before reactivity kicks in) to seed the initial value.
+	let selectedDay = $state((() => {
+		const init = data.weekStart;
+		const d = weekDays(init);
+		return d.includes(today) ? today : d[0];
+	})());
 
 	// When week changes via navigation, reset selected day
 	$effect(() => {
@@ -39,8 +47,40 @@
 
 	let weekRange = $derived(formatWeekRange(weekStart));
 
+	// Desktop right panel state machine
+	type PanelState =
+		| { kind: 'idle' }
+		| { kind: 'day-detail'; date: string }
+		| { kind: 'recipe-picker'; date: string };
+
+	let panelState = $state<PanelState>({ kind: 'idle' });
+
+	// Mobile bottom sheet for RecipePicker
+	let pickerOpen = $state(false);
+
+	// Hidden form field bindings
+	let addPlanId = $state('');
+	let addSlotDate = $state('');
+	let addRecipeId = $state('');
+	let addRecipeName = $state('');
+	let updPlanId = $state('');
+	let updSlotId = $state('');
+	let updRecipeId = $state('');
+	let updRecipeName = $state('');
+	let delPlanId = $state('');
+	let delSlotId = $state('');
+
+	let addSlotFormEl: HTMLFormElement;
+	let updateSlotFormEl: HTMLFormElement;
+	let deleteSlotFormEl: HTMLFormElement;
+
+	// UndoBar
+	let undoVisible = $state(false);
+	let undoMessage = $state('');
+
 	function handleSelectDay(day: string) {
 		selectedDay = day;
+		panelState = { kind: 'day-detail', date: day };
 	}
 
 	async function navigateWeek(direction: 'prev' | 'next' | 'today') {
@@ -51,6 +91,52 @@
 
 		await goto(`/planner?week=${newWeekStart}`, { invalidateAll: true });
 	}
+
+	async function handleRecipePick(recipeId: string, recipeName: string) {
+		// Capture date before modifying panel state
+		const date = panelState.kind === 'recipe-picker' ? panelState.date : selectedDay;
+
+		// Close pickers
+		pickerOpen = false;
+		if (panelState.kind === 'recipe-picker') {
+			panelState = { kind: 'idle' };
+		}
+
+		const existingSlot = slotMap[date];
+
+		if (existingSlot?.id) {
+			updPlanId = weekPlan!.id;
+			updSlotId = existingSlot.id;
+			updRecipeId = recipeId;
+			updRecipeName = recipeName;
+			await tick();
+			updateSlotFormEl.requestSubmit();
+		} else {
+			addPlanId = weekPlan!.id;
+			addSlotDate = date;
+			addRecipeId = recipeId;
+			addRecipeName = recipeName;
+			await tick();
+			addSlotFormEl.requestSubmit();
+		}
+	}
+
+	function handleUndo() {
+		undoVisible = false;
+		deleteSlotFormEl.requestSubmit();
+	}
+
+	function closePanelToIdle() {
+		panelState = { kind: 'idle' };
+	}
+
+	function closePanelToDayDetail() {
+		if (panelState.kind === 'recipe-picker') {
+			panelState = { kind: 'day-detail', date: panelState.date };
+		} else {
+			panelState = { kind: 'idle' };
+		}
+	}
 </script>
 
 <!-- Mobile & Tablet: vertical stack -->
@@ -76,12 +162,13 @@
 				›
 			</button>
 			{#if isPlanner}
-				<a
-					href="/planner/suggestions?day={selectedDay}"
+				<button
+					type="button"
+					onclick={() => (pickerOpen = true)}
 					class="rounded-[var(--radius-md)] bg-[var(--green-dark)] px-3 py-1.5 text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-white"
 				>
 					+ Gericht
-				</a>
+				</button>
 			{/if}
 		</div>
 	</header>
@@ -128,7 +215,7 @@
 				Restliche Woche
 			</h2>
 			<div class="space-y-2 md:grid md:grid-cols-2 md:gap-2 md:space-y-0">
-				{#each remainingSlotsWithMeal as slot}
+				{#each remainingSlotsWithMeal as slot (slot.slotDate)}
 					<button
 						type="button"
 						onclick={() => handleSelectDay(slot.slotDate)}
@@ -166,6 +253,19 @@
 			{/if}
 		</div>
 	{/if}
+
+	<!-- Mobile RecipePicker in BottomSheet -->
+	<BottomSheet open={pickerOpen} onclose={() => (pickerOpen = false)}>
+		<RecipePicker
+			planId={weekPlan?.id ?? ''}
+			date={selectedDay}
+			dateLabel={formatDayLabel(selectedDay)}
+			currentVarietyScore={varietyScore?.score ?? 0}
+			suggestions={[]}
+			allRecipes={weekPlan?.slots?.map((s: any) => s.recipe).filter(Boolean) ?? []}
+			onpick={handleRecipePick}
+		/>
+	</BottomSheet>
 </div>
 
 <!-- Desktop: 3-panel layout -->
@@ -200,12 +300,13 @@
 			</button>
 		</div>
 		{#if isPlanner}
-			<a
-				href="/planner/suggestions?day={selectedDay}"
+			<button
+				type="button"
+				onclick={() => (panelState = { kind: 'recipe-picker', date: selectedDay })}
 				class="ml-auto rounded-[var(--radius-md)] bg-[var(--green-dark)] px-4 py-2 text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-white"
 			>
 				+ Gericht hinzufügen
-			</a>
+			</button>
 		{/if}
 	</header>
 
@@ -240,7 +341,7 @@
 				</div>
 			{:else}
 				<div class="grid grid-cols-7 gap-[8px]">
-					{#each days as day}
+					{#each days as day (day)}
 						{@const slot = slotMap[day] ?? { id: null, slotDate: day, recipe: null }}
 						{@const isTodayDay = day === today}
 						{@const isSelectedDay = day === selectedDay}
@@ -266,7 +367,12 @@
 							<!-- Meal tile -->
 							<button
 								type="button"
-								onclick={() => handleSelectDay(day)}
+								onclick={() => {
+									handleSelectDay(day);
+									if (!slot.recipe && isPlanner) {
+										panelState = { kind: 'recipe-picker', date: day };
+									}
+								}}
 								aria-label={slot.recipe ? slot.recipe.name : `Gericht wählen für ${formatDayLabel(day)}`}
 								class="flex flex-1 flex-col rounded-[var(--radius-lg)] border p-2 text-left shadow-[var(--shadow-card)] transition-all hover:border-[var(--green-light)] hover:shadow-[var(--shadow-raised)]
 									{slot.recipe && !isTodayDay && !isSelectedDay ? 'border-[var(--color-border)] bg-[var(--color-surface)]' : ''}
@@ -293,57 +399,187 @@
 
 		<!-- Right detail panel -->
 		<aside class="flex w-[280px] flex-shrink-0 flex-col border-l border-[var(--color-border)] bg-[var(--color-page)] p-4">
-			<div class="mb-3">
-				<p class="font-[var(--font-sans)] text-[12px] font-medium uppercase tracking-wide text-[var(--color-text-muted)]">
-					{formatDayLabel(selectedDay)} · Abendessen
-				</p>
-			</div>
+			{#if panelState.kind === 'idle'}
+				<div class="flex flex-1 flex-col items-center justify-center">
+					<p class="font-[var(--font-sans)] text-[14px] text-[var(--color-text-muted)]">Kein Tag ausgewählt</p>
+				</div>
 
-			{#if selectedSlot?.recipe}
-				<h2 class="font-[var(--font-display)] text-[17px] font-[300] text-[var(--color-text)]">
-					{selectedSlot.recipe.name}
-				</h2>
-				{#if selectedSlot.recipe.effort || selectedSlot.recipe.cookTimeMin}
-					<p class="mt-1 font-[var(--font-sans)] text-[13px] text-[var(--color-text-muted)]">
-						{[selectedSlot.recipe.cookTimeMin ? `${selectedSlot.recipe.cookTimeMin} Min` : null, selectedSlot.recipe.effort].filter(Boolean).join(' · ')}
+			{:else if panelState.kind === 'day-detail'}
+				{@const detailDate = panelState.date}
+				{@const detailSlot = slotMap[detailDate] ?? { id: null, slotDate: detailDate, recipe: null }}
+
+				<!-- Panel header with close button -->
+				<div class="mb-3 flex items-start justify-between">
+					<p class="font-[var(--font-sans)] text-[12px] font-medium uppercase tracking-wide text-[var(--color-text-muted)]">
+						{formatDayLabel(detailDate)} · Abendessen
 					</p>
-				{/if}
+					<button
+						type="button"
+						onclick={closePanelToIdle}
+						aria-label="Panel schließen"
+						class="ml-2 flex-shrink-0 text-[18px] leading-none text-[var(--color-text-muted)] hover:text-[var(--color-text)]"
+					>
+						×
+					</button>
+				</div>
 
-				<!-- View and cook actions shown to all roles -->
-				<div class="mt-4 space-y-2">
-					<a
-						href="/recipes/{selectedSlot.recipe.id}"
-						class="block rounded-[var(--radius-md)] border border-[var(--color-border)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-[var(--color-text)] hover:bg-[var(--color-surface)]"
-					>
-						Rezept ansehen
-					</a>
-					<a
-						href="/recipes/{selectedSlot.recipe.id}/cook"
-						class="block rounded-[var(--radius-md)] bg-[var(--green-dark)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-white"
-					>
-						Koch-Modus
-					</a>
-					<!-- Swap action: planner only -->
-					{#if isPlanner}
+				{#if detailSlot.recipe}
+					<h2 class="font-[var(--font-display)] text-[17px] font-[300] text-[var(--color-text)]">
+						{detailSlot.recipe.name}
+					</h2>
+					{#if detailSlot.recipe.effort || detailSlot.recipe.cookTimeMin}
+						<p class="mt-1 font-[var(--font-sans)] text-[13px] text-[var(--color-text-muted)]">
+							{[detailSlot.recipe.cookTimeMin ? `${detailSlot.recipe.cookTimeMin} Min` : null, detailSlot.recipe.effort].filter(Boolean).join(' · ')}
+						</p>
+					{/if}
+
+					<div class="mt-4 space-y-2">
 						<a
-							href="/planner/suggestions?day={selectedDay}"
+							href="/recipes/{detailSlot.recipe.id}"
 							class="block rounded-[var(--radius-md)] border border-[var(--color-border)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-[var(--color-text)] hover:bg-[var(--color-surface)]"
 						>
-							Gericht tauschen
+							Rezept ansehen
 						</a>
+						<a
+							href="/recipes/{detailSlot.recipe.id}/cook"
+							class="block rounded-[var(--radius-md)] bg-[var(--green-dark)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-white"
+						>
+							Koch-Modus
+						</a>
+						{#if isPlanner}
+							<button
+								type="button"
+								onclick={() => (panelState = { kind: 'recipe-picker', date: detailDate })}
+								class="block w-full rounded-[var(--radius-md)] border border-[var(--color-border)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-[var(--color-text)] hover:bg-[var(--color-surface)]"
+							>
+								Gericht tauschen
+							</button>
+						{/if}
+					</div>
+				{:else}
+					<p class="font-[var(--font-sans)] text-[14px] text-[var(--color-text-muted)]">Kein Gericht geplant</p>
+					{#if isPlanner}
+						<button
+							type="button"
+							onclick={() => (panelState = { kind: 'recipe-picker', date: detailDate })}
+							class="mt-3 block w-full rounded-[var(--radius-md)] border border-dashed border-[var(--color-border)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-[var(--color-text-muted)]"
+						>
+							+ Gericht wählen
+						</button>
 					{/if}
-				</div>
-			{:else}
-				<p class="font-[var(--font-sans)] text-[14px] text-[var(--color-text-muted)]">Kein Gericht geplant</p>
-				{#if isPlanner}
-					<a
-						href="/planner/suggestions?day={selectedDay}"
-						class="mt-3 block rounded-[var(--radius-md)] border border-dashed border-[var(--color-border)] px-3 py-2 text-center text-[13px] font-medium tracking-[0.04em] font-[var(--font-sans)] text-[var(--color-text-muted)]"
-					>
-						+ Gericht wählen
-					</a>
 				{/if}
+
+			{:else if panelState.kind === 'recipe-picker'}
+				{@const pickerDate = panelState.date}
+
+				<!-- Panel header with back/close button -->
+				<div class="mb-3 flex items-center justify-between">
+					<p class="font-[var(--font-sans)] text-[12px] font-medium uppercase tracking-wide text-[var(--color-text-muted)]">
+						Rezept wählen
+					</p>
+					<button
+						type="button"
+						onclick={closePanelToDayDetail}
+						aria-label="Zurück"
+						class="ml-2 flex-shrink-0 text-[18px] leading-none text-[var(--color-text-muted)] hover:text-[var(--color-text)]"
+					>
+						×
+					</button>
+				</div>
+
+				<div class="flex-1 overflow-y-auto -mx-4 -mb-4">
+					<RecipePicker
+						planId={weekPlan?.id ?? ''}
+						date={pickerDate}
+						dateLabel={formatDayLabel(pickerDate)}
+						currentVarietyScore={varietyScore?.score ?? 0}
+						suggestions={[]}
+						allRecipes={weekPlan?.slots?.map((s: any) => s.recipe).filter(Boolean) ?? []}
+						onpick={handleRecipePick}
+					/>
+				</div>
 			{/if}
 		</aside>
 	</div>
 </div>
+
+<!-- Hidden forms for slot mutations -->
+<div class="hidden">
+	<!-- Add slot -->
+	<form
+		method="POST"
+		action="?/addSlot"
+		bind:this={addSlotFormEl}
+		use:enhance={({ formData }) => {
+			formData.set('planId', addPlanId);
+			formData.set('slotDate', addSlotDate);
+			formData.set('recipeId', addRecipeId);
+			return async ({ result, update }) => {
+				if (result.type === 'success' && result.data?.success) {
+					delPlanId = addPlanId;
+					delSlotId = (result.data as any)?.slot?.id ?? '';
+					undoMessage = `${addRecipeName} hinzugefügt`;
+					undoVisible = true;
+				}
+				await update({ reset: false });
+				await invalidateAll();
+			};
+		}}
+	>
+		<input type="hidden" name="planId" value={addPlanId} />
+		<input type="hidden" name="slotDate" value={addSlotDate} />
+		<input type="hidden" name="recipeId" value={addRecipeId} />
+	</form>
+
+	<!-- Update slot -->
+	<form
+		method="POST"
+		action="?/updateSlot"
+		bind:this={updateSlotFormEl}
+		use:enhance={({ formData }) => {
+			formData.set('planId', updPlanId);
+			formData.set('slotId', updSlotId);
+			formData.set('recipeId', updRecipeId);
+			return async ({ result, update }) => {
+				if (result.type === 'success' && result.data?.success) {
+					delPlanId = updPlanId;
+					delSlotId = (result.data as any)?.slot?.id ?? '';
+					undoMessage = `${updRecipeName} eingetragen`;
+					undoVisible = true;
+				}
+				await update({ reset: false });
+				await invalidateAll();
+			};
+		}}
+	>
+		<input type="hidden" name="planId" value={updPlanId} />
+		<input type="hidden" name="slotId" value={updSlotId} />
+		<input type="hidden" name="recipeId" value={updRecipeId} />
+	</form>
+
+	<!-- Delete slot (for undo) -->
+	<form
+		method="POST"
+		action="?/deleteSlot"
+		bind:this={deleteSlotFormEl}
+		use:enhance={({ formData }) => {
+			formData.set('planId', delPlanId);
+			formData.set('slotId', delSlotId);
+			return async ({ update }) => {
+				await update({ reset: false });
+				await invalidateAll();
+			};
+		}}
+	>
+		<input type="hidden" name="planId" value={delPlanId} />
+		<input type="hidden" name="slotId" value={delSlotId} />
+	</form>
+</div>
+
+<!-- Undo toast -->
+<UndoBar
+	visible={undoVisible}
+	message={undoMessage}
+	onundo={handleUndo}
+	ondismiss={() => (undoVisible = false)}
+/>

frontend/src/routes/(app)/planner/page.server.test.ts

@@ -6,8 +6,10 @@ vi.mock('$env/dynamic/private', () => ({
 
 const mockGet = vi.fn();
 const mockPost = vi.fn();
+const mockPatch = vi.fn();
+const mockDelete = vi.fn();
 vi.mock('$lib/server/api', () => ({
-	apiClient: () => ({ GET: mockGet, POST: mockPost })
+	apiClient: () => ({ GET: mockGet, POST: mockPost, PATCH: mockPatch, DELETE: mockDelete })
 }));
 
 describe('planner page — load', () => {
@@ -193,3 +195,89 @@ describe('planner page — variety score partial failure', () => {
 		expect(result.varietyScore).toBeNull();
 	});
 });
+
+describe('planner page — slot actions', () => {
+	let actions: any;
+
+	beforeEach(async () => {
+		mockGet.mockReset();
+		mockPost.mockReset();
+		mockPatch.mockReset();
+		mockDelete.mockReset();
+		vi.resetModules();
+		const mod = await import('./+page.server');
+		actions = mod.actions;
+	});
+
+	it('addSlot calls POST /v1/week-plans/{id}/slots and returns success with slot', async () => {
+		const formData = new FormData();
+		formData.set('planId', 'plan-1');
+		formData.set('slotDate', '2026-04-01');
+		formData.set('recipeId', 'r1');
+		mockPost.mockResolvedValue({ data: { id: 's1', slotDate: '2026-04-01' }, error: undefined });
+		const result = await actions.addSlot({
+			fetch: vi.fn(),
+			request: { formData: async () => formData }
+		} as any);
+		expect(mockPost).toHaveBeenCalledWith(
+			'/v1/week-plans/{id}/slots',
+			expect.objectContaining({
+				params: { path: { id: 'plan-1' } },
+				body: { slotDate: '2026-04-01', recipeId: 'r1' }
+			})
+		);
+		expect(result.success).toBe(true);
+		expect(result.slot?.id).toBe('s1');
+	});
+
+	it('addSlot returns failure when API errors', async () => {
+		const formData = new FormData();
+		formData.set('planId', 'plan-1');
+		formData.set('slotDate', '2026-04-01');
+		formData.set('recipeId', 'r1');
+		mockPost.mockResolvedValue({ data: undefined, error: { status: 500 } });
+		const result = await actions.addSlot({
+			fetch: vi.fn(),
+			request: { formData: async () => formData }
+		} as any);
+		expect(result.success).toBe(false);
+	});
+
+	it('updateSlot calls PATCH /v1/week-plans/{planId}/slots/{slotId} and returns success', async () => {
+		const formData = new FormData();
+		formData.set('planId', 'plan-1');
+		formData.set('slotId', 's1');
+		formData.set('recipeId', 'r2');
+		mockPatch.mockResolvedValue({ data: { id: 's1' }, error: undefined });
+		const result = await actions.updateSlot({
+			fetch: vi.fn(),
+			request: { formData: async () => formData }
+		} as any);
+		expect(mockPatch).toHaveBeenCalledWith(
+			'/v1/week-plans/{planId}/slots/{slotId}',
+			expect.objectContaining({
+				params: { path: { planId: 'plan-1', slotId: 's1' } },
+				body: { recipeId: 'r2' }
+			})
+		);
+		expect(result.success).toBe(true);
+	});
+
+	it('deleteSlot calls DELETE /v1/week-plans/{planId}/slots/{slotId} and returns success', async () => {
+		const formData = new FormData();
+		formData.set('planId', 'plan-1');
+		formData.set('slotId', 's1');
+		mockDelete.mockResolvedValue({ error: undefined });
+		const result = await actions.deleteSlot({
+			fetch: vi.fn(),
+			request: { formData: async () => formData }
+		} as any);
+		expect(mockDelete).toHaveBeenCalledWith(
+			'/v1/week-plans/{planId}/slots/{slotId}',
+			expect.objectContaining({
+				params: { path: { planId: 'plan-1', slotId: 's1' } }
+			})
+		);
+		expect(result.success).toBe(true);
+	});
+});