"use client";
import { useNavigate } from "@lazarv/react-server/navigation";
import { products } from "./routes";
// Simple seeded PRNG for deterministic data
function mulberry32(seed: number) {
return function () {
seed |= 0;
seed = (seed + 0x6d2b79f5) | 0;
let t = Math.imul(seed ^ (seed >>> 15), 1 | seed);
t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
};
}
const rand = mulberry32(42);
const ITEMS = Array.from({ length: 30 }, (_, i) => ({
id: i + 1,
name: `Product ${i + 1}`,
price: Math.round((rand() * 200 + 5) * 100) / 100,
rating: Math.round((rand() * 4 + 1) * 10) / 10,
}));
const SORT_OPTIONS = [
{ value: "name", label: "Name" },
{ value: "price", label: "Price" },
{ value: "rating", label: "Rating" },
] as const;
const PRICE_PRESETS = [
{ label: "All", min: 0, max: 10000 },
{ label: "Under $50", min: 0, max: 50 },
{ label: "$50–$100", min: 50, max: 100 },
{ label: "$100–$150", min: 100, max: 150 },
{ label: "Over $150", min: 150, max: 10000 },
] as const;
const PAGE_SIZE = 8;
function sortItems(items: typeof ITEMS, sort: string) {
const sorted = [...items];
switch (sort) {
case "price":
return sorted.toSorted((a, b) => a.price - b.price);
case "rating":
return sorted.toSorted((a, b) => b.rating - a.rating);
case "name":
default:
return sorted.toSorted((a, b) => a.name.localeCompare(b.name));
}
}
export default function ProductList() {
// products.useSearchParams() reads URL search params and validates them
// through the Zod schema in routes.ts. min_price and max_price come from
// the decoded ?price=min-max — the ProductPriceRange SearchParams transform
// in App.tsx splits that into separate params before Zod sees them.
const {
sort,
page: rawPage,
min_price,
max_price,
} = products.useSearchParams();
const page = rawPage ?? 1;
const navigate = useNavigate();
const sorted = sortItems(ITEMS, sort);
const priceFiltered = sorted.filter(
(item) => item.price >= min_price && item.price <= max_price
);
const totalPages = Math.ceil(priceFiltered.length / PAGE_SIZE);
const safePage = Math.min(Math.max(page, 1), totalPages || 1);
const pageItems = priceFiltered.slice(
(safePage - 1) * PAGE_SIZE,
safePage * PAGE_SIZE
);
return (
<div>
<h2>Products</h2>
<p>
Search params are validated with Zod via{" "}
<code>products.useSearchParams()</code>. Sort, price filter, and
pagination use <strong>functional updaters</strong> —{" "}
<code>search: (prev) => (...)</code> — which read the current params
at click time, avoiding race conditions from stale closures. The price
filter is stored as <code>?price=min-max</code> in the URL and decoded
to <code>min_price</code> / <code>max_price</code> by the route-scoped{" "}
<code>SearchParams</code> transform before validation runs.
</p>
{/* Sort controls — functional updater preserves other search params */}
<div style={{ display: "flex", gap: "0.5rem", marginBottom: "0.75rem" }}>
<span>Sort:</span>
{SORT_OPTIONS.map((opt) => (
<button
key={opt.value}
onClick={() =>
navigate(products, {
search: (prev) => ({ ...prev, sort: opt.value, page: 1 }),
})
}
style={{
fontWeight: sort === opt.value ? "bold" : "normal",
textDecoration: sort === opt.value ? "underline" : "none",
}}
>
{opt.label}
</button>
))}
</div>
{/* Price range filter — functional updater preserves sort while
resetting page. The encode transform converts min_price/max_price
to ?price=min-max in the URL */}
<div style={{ display: "flex", gap: "0.5rem", marginBottom: "1rem" }}>
<span>Price:</span>
{PRICE_PRESETS.map((p) => {
const active = min_price === p.min && max_price === p.max;
return (
<button
key={p.label}
onClick={() =>
navigate(products, {
search: (prev) => ({
...prev,
min_price: p.min,
max_price: p.max,
page: 1,
}),
})
}
style={{
fontWeight: active ? "bold" : "normal",
textDecoration: active ? "underline" : "none",
}}
>
{p.label}
</button>
);
})}
</div>
{/* Product table */}
<table
style={{ borderCollapse: "collapse", width: "100%", maxWidth: 500 }}
>
<thead>
<tr>
{["#", "Name", "Price", "Rating"].map((h) => (
<th
key={h}
style={{
textAlign: "left",
borderBottom: "2px solid #ccc",
padding: "0.4rem 0.8rem",
}}
>
{h}
</th>
))}
</tr>
</thead>
<tbody>
{pageItems.length === 0 ? (
<tr>
<td colSpan={4} style={{ padding: "0.8rem", color: "gray" }}>
No products in this price range.
</td>
</tr>
) : (
pageItems.map((item) => (
<tr key={item.id}>
<td style={{ padding: "0.3rem 0.8rem" }}>{item.id}</td>
<td style={{ padding: "0.3rem 0.8rem" }}>{item.name}</td>
<td style={{ padding: "0.3rem 0.8rem" }}>
${item.price.toFixed(2)}
</td>
<td style={{ padding: "0.3rem 0.8rem" }}>
{item.rating.toFixed(1)}★
</td>
</tr>
))
)}
</tbody>
</table>
{/* Pagination — functional updaters read the current page at click time,
avoiding stale-closure bugs when multiple clicks happen in quick succession */}
<div
style={{
display: "flex",
gap: "0.5rem",
marginTop: "1rem",
alignItems: "center",
}}
>
<button
disabled={safePage <= 1}