import type { ReactNode } from 'react'
import { Icon, type IconName } from './Icon'

export function PageHead({ title, description, actions }: { title: string; description: string; actions?: ReactNode }) {
  return (
    <div className="page-head">
      <div><h1>{title}</h1><p>{description}</p></div>
      {actions && <div className="head-actions">{actions}</div>}
    </div>
  )
}

// Shimmer placeholders shaped like the content they stand in for, so a page keeps its layout while loading.
export function Skeleton({ w, h, className }: { w?: number | string; h?: number | string; className?: string }) {
  return <span className={className ? `skel ${className}` : 'skel'} style={{ width: w, height: h }} aria-hidden="true" />
}

const LINE_WIDTHS = ['62%', '48%', '70%', '55%']

export function SkeletonRows({ count = 3, label }: { count?: number; label: string }) {
  return (
    <div className="result-list" role="status" aria-label={label}>
      {Array.from({ length: count }, (_, i) => (
        <div key={i} className="result-row skel-row">
          <Skeleton className="skel-cover" />
          <div className="result-main">
            <Skeleton w={LINE_WIDTHS[i % LINE_WIDTHS.length]} h={14} />
            <Skeleton w="34%" h={11} />
          </div>
          <Skeleton className="skel-pill" />
        </div>
      ))}
    </div>
  )
}

export function SkeletonCards({ count = 4, label }: { count?: number; label: string }) {
  return (
    <div className="content-grid" role="status" aria-label={label}>
      {Array.from({ length: count }, (_, i) => (
        <div key={i} className="content-card">
          <Skeleton className="skel-block" />
          <div className="content-card-body skel-stack">
            <Skeleton w="40%" h={20} className="skel-pill" />
            <Skeleton w="90%" h={14} />
            <Skeleton w={LINE_WIDTHS[i % LINE_WIDTHS.length]} h={14} />
            <Skeleton w="50%" h={11} />
          </div>
        </div>
      ))}
    </div>
  )
}

export function SkeletonLines({ count = 2, label }: { count?: number; label: string }) {
  return (
    <div className="skel-stack" role="status" aria-label={label}>
      {Array.from({ length: count }, (_, i) => <Skeleton key={i} w={LINE_WIDTHS[i % LINE_WIDTHS.length]} h={12} />)}
    </div>
  )
}

export function Empty({ icon = 'book', title, children }: { icon?: IconName; title: string; children?: ReactNode }) {
  return (
    <div className="empty">
      <span className="empty-icon"><Icon name={icon} /></span>
      <h3>{title}</h3>
      {children && <p>{children}</p>}
    </div>
  )
}