import { motion } from 'framer-motion'
import { Eye, EyeOff, Heart, X, Disc3 } from '../../lib/icons'
import { getBestImage } from '../../api/jellyfin'
import type { BaseItemDto } from '../../api/types'

/**
 * Floating ghost that follows the pointer while a drag is in progress.
 * Shows the moving item count and a label so multi-row drags read clearly.
 */
export function DragGhost({ count, pointerY, label }: { count: number; pointerY: number; label: string }) {
  return (
    <motion.div
      initial={{ opacity: 0, scale: 0.95 }}
      animate={{ opacity: 1, scale: 1 }}
      exit={{ opacity: 0, scale: 0.95 }}
      transition={{ duration: 0.12 }}
      style={{ position: 'fixed', left: 16, top: pointerY - 18, pointerEvents: 'none', zIndex: 80 }}
      className="bg-glass-strong backdrop-blur-xl border border-border-hover rounded-md px-3 py-1.5 shadow-2xl"
    >
      <p className="text-[12px] text-text-1 font-semibold tracking-tight">
        {count > 1 ? `Moving ${count} items` : label || 'Moving item'}
      </p>
    </motion.div>
  )
}

interface SelectionToolbarProps {
  count: number
  onClear: () => void
  onRemove: () => void
  onMarkPlayed: () => void
  onMarkUnplayed: () => void
  onToggleFavorite: () => void
}

/**
 * Bottom-floating toolbar that appears whenever the user has rows
 * selected. Bundles the bulk actions (mark watched / unwatched, favorite,
 * remove) plus a Done button to clear the selection.
 */
export function SelectionToolbar({
  count,
  onClear,
  onRemove,
  onMarkPlayed,
  onMarkUnplayed,
  onToggleFavorite,
}: SelectionToolbarProps) {
  return (
    <motion.div
      initial={{ y: 80, opacity: 0 }}
      animate={{ y: 0, opacity: 1 }}
      exit={{ y: 80, opacity: 0 }}
      transition={{ duration: 0.32, ease: [0.16, 1, 0.3, 1] }}
      className="fixed left-1/2 -translate-x-1/2 bottom-6 z-toast inline-flex items-center gap-2 h-12 pl-4 pr-2 rounded-full bg-black/85 backdrop-blur-xl border border-white/12 shadow-2xl"
      role="toolbar"
      aria-label="Playlist selection"
    >
      <span className="text-[12.5px] font-semibold text-white tabular-nums tracking-tight">
        {count} selected
      </span>
      <span className="w-px h-6 bg-white/10 mx-1" />
      <ToolbarButton onClick={onMarkPlayed} icon={<Eye size={13} />} label="Mark watched" />
      <ToolbarButton onClick={onMarkUnplayed} icon={<EyeOff size={13} />} label="Mark unwatched" />
      <ToolbarButton onClick={onToggleFavorite} icon={<Heart size={13} />} label="Favorite" />
      <ToolbarButton
        onClick={onRemove}
        icon={<X size={13} />}
        label="Remove"
        tone="danger"
      />
      <span className="w-px h-6 bg-white/10 mx-1" />
      <button
        onClick={onClear}
        className="h-8 px-3 rounded-full text-[11.5px] text-white/70 hover:text-white hover:bg-white/10 transition-colors focus-ring"
      >
        Done
      </button>
    </motion.div>
  )
}

function ToolbarButton({
  onClick,
  icon,
  label,
  tone,
}: {
  onClick: () => void
  icon: React.ReactNode
  label: string
  tone?: 'danger'
}) {
  return (
    <button
      onClick={onClick}
      className={`inline-flex items-center gap-1.5 h-8 px-2.5 rounded-full text-[11.5px] font-medium transition-colors focus-ring ${
        tone === 'danger'
          ? 'text-error hover:bg-error/15'
          : 'text-white/85 hover:text-white hover:bg-white/10'
      }`}
      title={label}
      aria-label={label}
    >
      {icon}
      <span className="hidden lg:inline">{label}</span>
    </button>
  )
}

/**
 * 2x2 poster mosaic fallback for playlists that don't have a primary
 * image. Shows the first 4 item posters in a grid - if fewer than 4 are
 * available, blanks fill the gaps. Empty state shows a music disc icon.
 */
export function PosterMosaic({ items, serverUrl }: { items: BaseItemDto[]; serverUrl: string }) {
  const tiles = items
    .slice(0, 4)
    .map(it => getBestImage(serverUrl, it, 'primary', 300))
    .filter(Boolean) as string[]

  return (
    <div className="w-[200px] aspect-square rounded-xl overflow-hidden ring-1 ring-white/10 shadow-[0_24px_60px_-12px_rgba(0,0,0,0.7)] grid grid-cols-2 grid-rows-2 gap-px bg-elevated">
      {tiles.length > 0 ? (
        Array.from({ length: 4 }).map((_, i) => (
          <div key={i} className="bg-elevated relative overflow-hidden">
            {tiles[i] ? (
              <img src={tiles[i]} alt="" className="w-full h-full object-cover" />
            ) : (
              <div className="w-full h-full bg-gradient-to-br from-elevated to-surface" />
            )}
          </div>
        ))
      ) : (
        <div className="col-span-2 row-span-2 grid place-items-center">
          <Disc3 size={48} className="text-text-4 opacity-50" />
        </div>
      )}
    </div>
  )
}