import { useState, useMemo } from 'react'
import { useTimeout } from '../utils/useTimeout'
import { Icon } from './Icon'
import { iconRegistry, type IconRegistryEntry } from './icon-registry'
import { Kbd } from './ui/Kbd'
import { Badge } from './ui/Badge'

type IconItem = IconRegistryEntry

/* The curated showcase set — components come straight from the shared
   registry in Icon.tsx, so there is no second icon list to drift. */
const ICONS: IconItem[] = iconRegistry

const CATEGORIES = ['All', 'Navigation', 'Interface', 'System', 'Status'] as const
type Category = (typeof CATEGORIES)[number]

export function IconMatrix() {
  const [activeCategory, setActiveCategory] = useState<Category>('All')
  const [search, setSearch] = useState('')
  const [size, setSize] = useState<number>(20)
  const [copiedName, setCopiedName] = useState<string | null>(null)
  const { schedule } = useTimeout()

  const filteredIcons = useMemo(() => {
    return ICONS.filter(icon => {
      const matchesCategory = activeCategory === 'All' || icon.category === activeCategory
      const matchesSearch =
        icon.name.toLowerCase().includes(search.toLowerCase()) ||
        icon.pascalName.toLowerCase().includes(search.toLowerCase())
      return matchesCategory && matchesSearch
    })
  }, [activeCategory, search])

  const copyUsage = (icon: IconItem) => {
    const code = `<${icon.pascalName} size={${size}} />`
    navigator.clipboard?.writeText(code)
    setCopiedName(icon.name)
    schedule(() => setCopiedName(null), 2000)
  }

  return (
    <div className="icon-matrix-container">
      {/* Header controls */}
      <div className="icon-matrix-header">
        <div className="icon-search-bar">
          <Icon name="search" size={16} />
          <input
            type="text"
            placeholder="Search icons (e.g. arrow, check, sparkles)..."
            aria-label="Search icons"
            value={search}
            onChange={e => setSearch(e.target.value)}
            className="icon-search-input"
          />
          {search && (
            <button className="icon-clear-btn" onClick={() => setSearch('')}>
              <Icon name="close" size={14} />
            </button>
          )}
        </div>

        <div className="icon-size-picker">
          <span className="mono muted">Size:</span>
          {[16, 20, 24].map(s => (
            <button
              key={s}
              className={`icon-size-btn ${size === s ? 'active' : ''}`}
              onClick={() => setSize(s)}
            >
              {s}px
            </button>
          ))}
        </div>
      </div>

      {/* Category tabs */}
      <div className="icon-category-tabs">
        {CATEGORIES.map(cat => (
          <button
            key={cat}
            className={`icon-cat-btn ${activeCategory === cat ? 'active' : ''}`}
            onClick={() => setActiveCategory(cat)}
          >
            {cat}
            <span className="icon-cat-count">
              {cat === 'All' ? ICONS.length : ICONS.filter(i => i.category === cat).length}
            </span>
          </button>
        ))}
      </div>

      {/* Grid of icons */}
      <div className="icon-grid">
        {filteredIcons.map(icon => {
          const isCopied = copiedName === icon.name
          return (
            <button
              key={icon.name}
              className={`icon-tile ${isCopied ? 'copied' : ''}`}
              onClick={() => copyUsage(icon)}
              title={`Click to copy <${icon.pascalName} />`}
            >
              <div className="icon-tile-glyph">
                {isCopied ? (
                  <Icon name="check" size={size} className="accent" />
                ) : (
                  <icon.component size={size} strokeWidth={1.8} />
                )}
              </div>
              <span className="icon-tile-name">{icon.name}</span>
              <span className="icon-tile-action">
                {isCopied ? 'Copied!' : <Kbd>Copy</Kbd>}
              </span>
            </button>
          )
        })}
      </div>

      {filteredIcons.length === 0 && (
        <div className="empty-state">
          <div className="empty-state-icon">
            <Icon name="search" size={24} />
          </div>
          <h4 style={{ margin: '0 0 var(--space-2)' }}>No icons found</h4>
          <p className="muted" style={{ margin: 0, fontSize: 'var(--text-xs)' }}>
            No icon matches "{search}". You can use any of Lucide's 1,400+ icons directly via{' '}
            <code>lucide-react</code>.
          </p>
        </div>
      )}

      {/* Footer usage tip */}
      <div className="icon-matrix-footer">
        <div className="icon-footer-pill">
          <Badge variant="outline">lucide-react</Badge>
          <span>Over 1,400+ SVG icons available. Fully tree-shaken and styled via <code>currentColor</code>.</span>
        </div>
      </div>
    </div>
  )
}