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feat: add reusable SkeletonLoader and integrate in ContestCodeforcesPage #121

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feat: add reusable SkeletonLoader and integrate in ContestCodeforcesPage #121

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49 changes: 49 additions & 0 deletions frontend/src/components/shared/SkeletonLoader.jsx
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Original file line number Diff line number Diff line change
@@ -0,0 +1,49 @@
import React from 'react';

/**
* Reusable Skeleton Loader component to provide visual loading feedback.
* @param {string} className - Optional Tailwind utility classes.
*/
export function Skeleton({ className = "" }) {
return (
<div className={`animate-pulse bg-slate-200 rounded-md ${className}`} />
);
}

/**
* Skeleton loader designed for loading table or list rows.
*/
export function TableRowSkeleton({ rows = 5 }) {
return (
<div className="space-y-4 w-full">
{Array.from({ length: rows }).map((_, i) => (
<div key={i} className="flex items-center gap-4 px-4 py-4 border-b border-gray-200">
<Skeleton className="h-4 w-8" />
<Skeleton className="h-4 w-20" />
<Skeleton className="h-4 flex-1" />
<Skeleton className="h-4 w-40" />
<Skeleton className="h-4 w-12" />
</div>
))}
</div>
);
}

/**
* Skeleton loader designed for dashboard stat cards.
*/
export function CardSkeleton({ cards = 3 }) {
return (
<div className="grid grid-cols-1 md:grid-cols-3 gap-6">
{Array.from({ length: cards }).map((_, i) => (
<div key={i} className="border-4 border-black p-6 space-y-3">
<Skeleton className="h-4 w-24" />
<Skeleton className="h-8 w-16" />
<Skeleton className="h-4 w-32" />
</div>
))}
</div>
);
}

export default Skeleton;
112 changes: 67 additions & 45 deletions frontend/src/pages/ContestCodeforcesPage.jsx
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Original file line number Diff line number Diff line change
@@ -1,7 +1,16 @@
import { useState } from "react";
import { useState, useEffect } from "react";
import { CardSkeleton } from "../components/shared/SkeletonLoader";

export default function ContestCodeforcesPage() {
const [selectedDivision, setSelectedDivision] = useState("all");
const [loading, setLoading] = useState(true);

useEffect(() => {
const timer = setTimeout(() => {
setLoading(false);
}, 800);
return () => clearTimeout(timer);
}, []);

const contestSolutions = [
{
Expand Down Expand Up @@ -33,6 +42,10 @@ export default function ContestCodeforcesPage() {
},
];

const filteredContests = contestSolutions.filter(
(c) => selectedDivision === "all" || c.division === selectedDivision
);

return (
<div className="w-full min-h-screen bg-white">
{/* Hero Section */}
Expand Down Expand Up @@ -82,7 +95,7 @@ export default function ContestCodeforcesPage() {
{["all", "Div. 1", "Div. 2", "Div. 3", "Div. 4", "Educational", "Global"].map((div) => (
<button
key={div}
onClick={() => setSelectedDivision(div)}
onClick={() => { setSelectedDivision(div); setLoading(true); setTimeout(() => setLoading(false), 500); }}
className={`px-6 py-3 border-4 border-black font-black text-sm uppercase tracking-widest transition-all ${
selectedDivision === div
? "bg-blue-600 text-white"
Expand All @@ -103,57 +116,66 @@ export default function ContestCodeforcesPage() {
Recent Contests
</h2>

<div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
{contestSolutions.map((contest) => (
<div
key={contest.id}
className="border-4 border-black bg-white p-6 hover:shadow-[12px_12px_0_0_rgba(0,0,0,1)] hover:-translate-x-2 hover:-translate-y-2 transition-all cursor-pointer"
>
<div className="flex items-start justify-between mb-4">
<div className="border-2 border-blue-600 bg-blue-50 text-blue-800 px-3 py-1 text-xs font-black uppercase tracking-wide">
{contest.division}
</div>
<div className="text-xs font-black uppercase tracking-widest text-gray-500">
{contest.date}
{loading ? (
<CardSkeleton cards={2} />
) : filteredContests.length === 0 ? (
<div className="border-4 border-black p-12 text-center bg-gray-50">
<p className="text-xl font-black uppercase">No Contests Loaded</p>
<p className="text-xs font-bold uppercase text-gray-500 mt-2">More editorials are coming soon!</p>
</div>
) : (
<div className="grid grid-cols-1 lg:grid-cols-2 gap-6">
{filteredContests.map((contest) => (
<div
key={contest.id}
className="border-4 border-black bg-white p-6 hover:shadow-[12px_12px_0_0_rgba(0,0,0,1)] hover:-translate-x-2 hover:-translate-y-2 transition-all cursor-pointer"
>
<div className="flex items-start justify-between mb-4">
<div className="border-2 border-blue-600 bg-blue-50 text-blue-800 px-3 py-1 text-xs font-black uppercase tracking-wide">
{contest.division}
</div>
<div className="text-xs font-black uppercase tracking-widest text-gray-500">
{contest.date}
</div>
</div>
</div>

<h3 className="text-xl font-black uppercase tracking-tight text-black mb-3">
{contest.contestName}
</h3>
<h3 className="text-xl font-black uppercase tracking-tight text-black mb-3">
{contest.contestName}
</h3>

<div className="grid grid-cols-2 gap-4 mb-4">
<div className="border-2 border-black p-3 bg-gray-50">
<div className="text-2xl font-black text-black">{contest.problems}</div>
<div className="text-xs font-black uppercase tracking-wide text-gray-600 mt-1">
Problems
<div className="grid grid-cols-2 gap-4 mb-4">
<div className="border-2 border-black p-3 bg-gray-50">
<div className="text-2xl font-black text-black">{contest.problems}</div>
<div className="text-xs font-black uppercase tracking-wide text-gray-600 mt-1">
Problems
</div>
</div>
</div>
<div className="border-2 border-black p-3 bg-gray-50">
<div className="text-sm font-black text-black">{contest.difficulty}</div>
<div className="text-xs font-black uppercase tracking-wide text-gray-600 mt-1">
Rating
<div className="border-2 border-black p-3 bg-gray-50">
<div className="text-sm font-black text-black">{contest.difficulty}</div>
<div className="text-xs font-black uppercase tracking-wide text-gray-600 mt-1">
Rating
</div>
</div>
</div>
</div>

<div className="flex flex-wrap gap-2 mb-4">
{contest.tags.map((tag, idx) => (
<span
key={idx}
className="text-[10px] font-black uppercase tracking-wide border-2 border-black px-2 py-1 bg-white"
>
{tag}
</span>
))}
</div>
<div className="flex flex-wrap gap-2 mb-4">
{contest.tags.map((tag, idx) => (
<span
key={idx}
className="text-[10px] font-black uppercase tracking-wide border-2 border-black px-2 py-1 bg-white"
>
{tag}
</span>
))}
</div>

<button className="w-full px-6 py-3 border-4 border-black bg-blue-600 text-white font-black uppercase tracking-widest hover:bg-black transition-colors">
View Solutions →
</button>
</div>
))}
</div>
<button className="w-full px-6 py-3 border-4 border-black bg-blue-600 text-white font-black uppercase tracking-widest hover:bg-black transition-colors">
View Solutions →
</button>
</div>
))}
</div>
)}

<div className="mt-12 text-center">
<button className="px-10 py-4 border-4 border-black bg-black text-white font-black uppercase tracking-widest hover:bg-white hover:text-black transition-colors">
Expand Down
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