feat: product references + grocery detail page

- references table (brand, price, unit, quality_score) with FK to groceries
- /grocery/[id] page for managing references per item
- Unit dropdown (€/kg, €/L, €/u) defaulting to €/kg
- → link on all items navigates to detail page
- Delete item moved from catalog to detail page

2 files changed, 324 insertions, 0 deletions

diff --git a/src/routes/grocery/[id]/+page.server.ts b/src/routes/grocery/[id]/+page.server.ts
new file mode 100644
index 0000000..88aa137
--- /dev/null
+++ b/src/routes/grocery/[id]/+page.server.ts
@@ -0,0 +1,71 @@
+import { error, fail, redirect } from '@sveltejs/kit';
+import { db } from '$lib/server/db';
+import { groceries, categories, references } from '$lib/server/db/schema';
+import { eq } from 'drizzle-orm';
+import type { Actions, PageServerLoad } from './$types';
+
+export const load: PageServerLoad = async ({ params }) => {
+	const id = Number(params.id);
+
+	const [item] = await db.select().from(groceries).where(eq(groceries.id, id));
+	if (!item) throw error(404, 'Item not found');
+
+	const [cat] = item.categoryId
+		? await db
+				.select()
+				.from(categories)
+				.where(eq(categories.id, item.categoryId))
+		: [null];
+
+	const refs = await db
+		.select()
+		.from(references)
+		.where(eq(references.groceryId, id));
+
+	return {
+		item: {
+			...item,
+			categoryName: cat?.name ?? null,
+		},
+		references: refs,
+	};
+};
+
+export const actions: Actions = {
+	add: async ({ request, params }) => {
+		const data = await request.formData();
+		const brand = data.get('brand')?.toString().trim();
+		const price = data.get('price')?.toString().trim();
+		const unit = data.get('unit')?.toString().trim();
+		const qualityScore = data.get('quality_score')?.toString().trim();
+
+		if (!brand) {
+			return fail(400, { error: 'Brand is required' });
+		}
+
+		await db.insert(references).values({
+			groceryId: Number(params.id),
+			brand,
+			price: price ? Number(price) : null,
+			unit: unit || null,
+			qualityScore: qualityScore ? Number(qualityScore) : null,
+		});
+
+		return { success: true };
+	},
+
+	delete: async ({ request }) => {
+		const data = await request.formData();
+		const id = Number(data.get('id'));
+
+		await db.delete(references).where(eq(references.id, id));
+
+		return { success: true };
+	},
+
+	deleteItem: async ({ params }) => {
+		await db.delete(groceries).where(eq(groceries.id, Number(params.id)));
+
+		throw redirect(303, '/');
+	},
+};
diff --git a/src/routes/grocery/[id]/+page.svelte b/src/routes/grocery/[id]/+page.svelte
new file mode 100644
index 0000000..15c4e8b
--- /dev/null
+++ b/src/routes/grocery/[id]/+page.svelte
@@ -0,0 +1,253 @@
+<script lang="ts">
+	import '../../../app.css';
+	import { enhance } from '$app/forms';
+	import { page } from '$app/stores';
+
+	let { data, form } = $props();
+	let brand = $state('');
+	let price = $state('');
+	let unit = $state('€/kg');
+	let qualityScore = $state('');
+</script>
+
+<h1>{data.item.name}</h1>
+
+{#if data.item.categoryName}
+	<p class="category">{data.item.categoryName}</p>
+{/if}
+
+<hr />
+
+<h2>References</h2>
+
+<form class="add-form" method="POST" action="?/add" use:enhance>
+	<label>
+		<span class="label">Brand</span>
+		<input
+			type="text"
+			name="brand"
+			bind:value={brand}
+			placeholder="e.g. Carte Noire"
+			autocomplete="off"
+		/>
+	</label>
+	<div class="ref-row">
+		<label>
+			<span class="label">Price</span>
+			<input
+				type="number"
+				name="price"
+				bind:value={price}
+				placeholder="5.99"
+				step="0.01"
+			/>
+		</label>
+		<label>
+			<span class="label">Unit</span>
+			<select name="unit" bind:value={unit}>
+				<option value="€/kg">€/kg</option>
+				<option value="€/L">€/L</option>
+				<option value="€/u">€/u</option>
+			</select>
+		</label>
+		<label>
+			<span class="label">Score</span>
+			<input
+				type="number"
+				name="quality_score"
+				bind:value={qualityScore}
+				placeholder="0-100"
+				min="0"
+				max="100"
+			/>
+		</label>
+	</div>
+	<button type="submit">Add reference</button>
+</form>
+
+{#if form?.error}
+	<p class="error">{form.error}</p>
+{/if}
+
+<form method="POST" action="?/delete" use:enhance>
+	<ul class="item-list">
+		{#each data?.references ?? [] as ref (ref.id)}
+			<li class="ref-item">
+				<div class="ref-info">
+					<strong>{ref.brand}</strong>
+					{#if ref.price}
+						<span class="ref-detail"
+							>{ref.price.toFixed(2)}{ref.unit ? ` ${ref.unit}` : ''}</span
+						>
+					{/if}
+					{#if ref.qualityScore != null}
+						<span class="ref-detail">Score: {ref.qualityScore}/100</span>
+					{/if}
+				</div>
+				<button class="delete-btn" name="id" value={ref.id} type="submit">
+					&times;
+				</button>
+			</li>
+		{/each}
+	</ul>
+</form>
+
+{#if (data?.references?.length ?? 0) === 0}
+	<p class="empty">No references yet</p>
+{/if}
+
+<form method="POST" action="?/deleteItem" use:enhance>
+	<button type="submit" class="delete-item-btn">Delete item</button>
+</form>
+
+<a href="/" class="back-link">&larr; Back to list</a>
+
+<style>
+	.category {
+		color: #999;
+		font-size: 0.875rem;
+	}
+
+	.add-form {
+		display: flex;
+		flex-direction: column;
+		gap: 0.5rem;
+		margin-bottom: 1rem;
+		margin-top: 0.5rem;
+	}
+
+	.add-form label {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+	}
+
+	.label {
+		font-size: 0.75rem;
+		font-weight: 600;
+		text-transform: uppercase;
+		color: #999;
+	}
+
+	input,
+	select {
+		padding: 0.75rem;
+		border: 1px solid #ccc;
+		border-radius: 0.5rem;
+		font-size: 1rem;
+		font-family: inherit;
+		background: #fff;
+	}
+
+	.ref-row {
+		display: flex;
+		gap: 0.5rem;
+	}
+
+	.ref-row label {
+		flex: 1;
+		min-width: 0;
+	}
+
+	.add-form button[type='submit'] {
+		padding: 0.75rem 1.25rem;
+		border: none;
+		border-radius: 0.5rem;
+		background: #333;
+		color: #fff;
+		font-size: 1rem;
+		align-self: flex-start;
+	}
+
+	.error {
+		color: #d00;
+		margin-top: -0.5rem;
+		margin-bottom: 1rem;
+	}
+
+	hr {
+		border: none;
+		border-top: 1px solid #ddd;
+		margin: 1.5rem 0;
+	}
+
+	.item-list {
+		list-style: none;
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+	}
+
+	.ref-item {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		padding: 0.75rem;
+		border: 1px solid #e0e0e0;
+		border-radius: 0.5rem;
+		background: #fff;
+	}
+
+	.ref-info {
+		flex-grow: 1;
+		display: flex;
+		flex-wrap: wrap;
+		gap: 0.5rem;
+		align-items: baseline;
+	}
+
+	.ref-detail {
+		color: #666;
+		font-size: 0.875rem;
+	}
+
+	.delete-btn {
+		flex-shrink: 0;
+		width: 2rem;
+		aspect-ratio: 1;
+		padding: 0;
+		border: 1px solid #e0e0e0;
+		border-radius: 0.5rem;
+		background: #fff;
+		color: #d00;
+		font-size: 1.25rem;
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		cursor: pointer;
+		transition: background 0.15s;
+	}
+
+	.delete-btn:hover {
+		background: #fee;
+	}
+
+	.empty {
+		color: #999;
+		font-size: 0.875rem;
+		margin-top: 0.5rem;
+	}
+
+	.back-link {
+		display: inline-block;
+		margin-top: 1.5rem;
+		color: #333;
+		text-decoration: none;
+		font-size: 0.875rem;
+	}
+
+	.delete-item-btn {
+		margin-top: 1.5rem;
+		padding: 0.5rem 1rem;
+		border: 1px solid #d00;
+		border-radius: 0.5rem;
+		background: #fff;
+		color: #d00;
+		font-size: 0.875rem;
+		cursor: pointer;
+	}
+
+	.delete-item-btn:hover {
+		background: #fee;
+	}
+</style>