frontend/src/components/shared/Skeletons.jsx

import clsx from 'clsx'

export function SkeletonBlock({ className = '' }) {
  return (
    <span
      className={clsx('block animate-pulse rounded bg-slate-200/80 dark:bg-slate-800', className)}
      aria-hidden="true"
    />
  )
}

export function TestCardSkeleton() {
  return (
    <div className="gate-card p-5 flex flex-col gap-3" aria-hidden="true">
      <div className="flex items-start justify-between gap-2">
        <SkeletonBlock className="h-5 w-2/3" />
        <SkeletonBlock className="h-5 w-12 rounded" />
      </div>
      <SkeletonBlock className="h-4 w-full" />
      <SkeletonBlock className="h-4 w-4/5" />
      <div className="flex items-center gap-4 mt-1">
        <SkeletonBlock className="h-3 w-14" />
        <SkeletonBlock className="h-3 w-20" />
        <SkeletonBlock className="h-3 w-16" />
      </div>
      <div className="pt-2 border-t border-slate-200 dark:border-slate-800 mt-2">
        <SkeletonBlock className="h-9 w-full rounded-xl" />
      </div>
    </div>
  )
}

export function StatCardSkeleton() {
  return (
    <div className="gate-card p-5 flex flex-col gap-2">
      <SkeletonBlock className="w-9 h-9 rounded-xl" />
      <SkeletonBlock className="h-8 w-14 mt-1" />
      <SkeletonBlock className="h-4 w-24" />
    </div>
  )
}

export function LeaderboardSkeleton() {
  return (
    <div className="space-y-6">
      <div className="grid grid-cols-3 gap-2 sm:gap-3">
        <div className="gate-card border border-slate-200 dark:border-slate-800 p-2.5 sm:p-4 flex flex-col items-center justify-end h-24 sm:h-28">
          <SkeletonBlock className="h-4 w-16 mb-2" />
          <SkeletonBlock className="h-3 w-10 mb-1" />
          <SkeletonBlock className="h-3 w-12" />
        </div>
        <div className="gate-card border border-slate-200 dark:border-slate-800 p-2.5 sm:p-4 flex flex-col items-center justify-end h-28 sm:h-36">
          <SkeletonBlock className="h-4 w-20 mb-2" />
          <SkeletonBlock className="h-3 w-10 mb-1" />
          <SkeletonBlock className="h-3 w-12" />
        </div>
        <div className="gate-card border border-slate-200 dark:border-slate-800 p-2.5 sm:p-4 flex flex-col items-center justify-end h-20 sm:h-24">
          <SkeletonBlock className="h-4 w-16 mb-2" />
          <SkeletonBlock className="h-3 w-10 mb-1" />
          <SkeletonBlock className="h-3 w-12" />
        </div>
      </div>
      <div className="gate-card overflow-hidden">
        <div className="flex flex-col">
          {[1, 2, 3, 4, 5].map((i) => (
            <div key={i} className="flex items-center gap-4 p-3.5 border-b border-slate-200 dark:border-slate-800 last:border-0">
              <SkeletonBlock className="h-6 w-6 rounded-full" />
              <div className="flex-1 flex gap-3 items-center">
                <SkeletonBlock className="h-6 w-6 rounded-full flex-shrink-0" />
                <SkeletonBlock className="h-4 w-32" />
              </div>
              <SkeletonBlock className="h-4 w-12" />
              <SkeletonBlock className="h-4 w-10 hidden sm:block" />
            </div>
          ))}
        </div>
      </div>
    </div>
  )
}

export function ResultCardSkeleton() {
  return (
    <div className="gate-card p-4 flex items-center gap-4">
      <SkeletonBlock className="w-12 h-12 rounded-xl flex-shrink-0" />
      <div className="flex-1 space-y-2">
        <SkeletonBlock className="h-5 w-2/3 max-w-[250px]" />
        <SkeletonBlock className="h-3 w-40" />
      </div>
      <SkeletonBlock className="h-8 w-16 rounded flex-shrink-0" />
    </div>
  )
}

export function ResultSkeleton() {
  return (
    <div className="space-y-6 mt-4">
      <div className="gate-card p-6 md:p-10 flex flex-col items-center text-center">
        <SkeletonBlock className="w-32 h-32 rounded-full mb-4" />
        <SkeletonBlock className="h-8 w-40 mb-2" />
        <SkeletonBlock className="h-4 w-32 mb-6" />
        
        <div className="w-full max-w-sm grid grid-cols-3 gap-2">
          {[1,2,3].map(i => (
            <div key={i} className="flex flex-col items-center gap-2 p-3 border rounded-xl border-slate-200 dark:border-slate-800">
              <SkeletonBlock className="h-6 w-10" />
              <SkeletonBlock className="h-3 w-16" />
            </div>
          ))}
        </div>
      </div>
      
      <div className="grid sm:grid-cols-2 gap-4">
        {[1,2].map(i => (
          <div key={i} className="gate-card p-5">
            <SkeletonBlock className="h-5 w-32 mb-4" />
            <SkeletonBlock className="h-10 w-full mb-2 rounded-xl" />
            <SkeletonBlock className="h-10 w-full rounded-xl" />
          </div>
        ))}
      </div>
    </div>
  )
}