import React, { useState, useCallback } from 'react'
import { createRoot } from 'react-dom/client'
import ArtworkHero from '../components/artwork/ArtworkHero'
import ArtworkMeta from '../components/artwork/ArtworkMeta'
import ArtworkActions from '../components/artwork/ArtworkActions'
import ArtworkAwards from '../components/artwork/ArtworkAwards'
import ArtworkStats from '../components/artwork/ArtworkStats'
import ArtworkTags from '../components/artwork/ArtworkTags'
import ArtworkAuthor from '../components/artwork/ArtworkAuthor'
import ArtworkRelated from '../components/artwork/ArtworkRelated'
import ArtworkDescription from '../components/artwork/ArtworkDescription'
import ArtworkComments from '../components/artwork/ArtworkComments'
import ArtworkReactions from '../components/artwork/ArtworkReactions'
import ArtworkNavigator from '../components/viewer/ArtworkNavigator'
import ArtworkViewer from '../components/viewer/ArtworkViewer'

function ArtworkPage({ artwork: initialArtwork, related: initialRelated, presentMd: initialMd, presentLg: initialLg, presentXl: initialXl, presentSq: initialSq, canonicalUrl: initialCanonical, isAuthenticated = false, comments: initialComments = [] }) {
  const [viewerOpen, setViewerOpen] = useState(false)
  const openViewer = useCallback(() => setViewerOpen(true), [])
  const closeViewer = useCallback(() => setViewerOpen(false), [])

  // Navigable state — updated on client-side navigation
  const [artwork, setArtwork] = useState(initialArtwork)
  const [liveStats, setLiveStats] = useState(initialArtwork?.stats || {})

  const handleStatsChange = useCallback((delta) => {
    setLiveStats(prev => {
      const next = { ...prev }
      Object.entries(delta).forEach(([key, val]) => {
        next[key] = Math.max(0, (Number(next[key]) || 0) + val)
      })
      return next
    })
  }, [])
  const [presentMd, setPresentMd] = useState(initialMd)
  const [presentLg, setPresentLg] = useState(initialLg)
  const [presentXl, setPresentXl] = useState(initialXl)
  const [presentSq, setPresentSq] = useState(initialSq)
  const [related, setRelated] = useState(initialRelated)
  const [comments, setComments] = useState(initialComments)
  const [canonicalUrl, setCanonicalUrl] = useState(initialCanonical)

  // Nav arrow state — populated by ArtworkNavigator once neighbors resolve
  const [navState, setNavState] = useState({ hasPrev: false, hasNext: false, navigatePrev: null, navigateNext: null })

  /**
   * Called by ArtworkNavigator after a successful no-reload navigation.
   * data = ArtworkResource JSON from /api/artworks/{id}/page
   */
  const handleNavigate = useCallback((data) => {
    setArtwork(data)
    setLiveStats(data.stats || {})
    setPresentMd(data.thumbs?.md ?? null)
    setPresentLg(data.thumbs?.lg ?? null)
    setPresentXl(data.thumbs?.xl ?? null)
    setPresentSq(data.thumbs?.sq ?? null)
    setRelated([])      // cleared on navigation; user can scroll down for related
    setComments([])     // cleared; per-page server data
    setCanonicalUrl(data.canonical_url ?? window.location.href)
    setViewerOpen(false)  // close viewer when navigating away
  }, [])

  if (!artwork) return null

  const initialAwards = artwork?.awards ?? null

  return (
    <>
      <main className="mx-auto w-full max-w-screen-xl px-4 pb-24 pt-10 sm:px-6 lg:px-8 lg:pb-12">
        <ArtworkHero
          artwork={artwork}
          presentMd={presentMd}
          presentLg={presentLg}
          presentXl={presentXl}
          onOpenViewer={openViewer}
          hasPrev={navState.hasPrev}
          hasNext={navState.hasNext}
          onPrev={navState.navigatePrev}
          onNext={navState.navigateNext}
        />

        <div className="mt-6 space-y-4 lg:hidden">
          <ArtworkAuthor artwork={artwork} presentSq={presentSq} />
          <ArtworkActions artwork={artwork} canonicalUrl={canonicalUrl} mobilePriority onStatsChange={handleStatsChange} />
          <ArtworkAwards artwork={artwork} initialAwards={initialAwards} isAuthenticated={isAuthenticated} />
        </div>

        <div className="mt-8 grid grid-cols-1 gap-8 lg:grid-cols-3">
          <div className="space-y-6 lg:col-span-2">
            <ArtworkMeta artwork={artwork} />
            <ArtworkStats artwork={artwork} stats={liveStats} />
            <ArtworkTags artwork={artwork} />
            <ArtworkDescription artwork={artwork} />
            <ArtworkReactions artworkId={artwork.id} isLoggedIn={isAuthenticated} />
            <ArtworkComments
              artworkId={artwork.id}
              comments={comments}
              isLoggedIn={isAuthenticated}
              loginUrl="/login"
            />
          </div>

          <aside className="hidden space-y-6 lg:block">
            <div className="sticky top-24 space-y-4">
              <ArtworkAuthor artwork={artwork} presentSq={presentSq} />
              <ArtworkActions artwork={artwork} canonicalUrl={canonicalUrl} onStatsChange={handleStatsChange} />
              <ArtworkAwards artwork={artwork} initialAwards={initialAwards} isAuthenticated={isAuthenticated} />
            </div>
          </aside>
        </div>

        <ArtworkRelated related={related} />
      </main>

      {/* Artwork navigator — prev/next arrows, keyboard, swipe, no page reload */}
      <ArtworkNavigator
        artworkId={artwork.id}
        onNavigate={handleNavigate}
        onOpenViewer={openViewer}
        onReady={setNavState}
      />

      {/* Fullscreen viewer modal */}
      <ArtworkViewer
        isOpen={viewerOpen}
        onClose={closeViewer}
        artwork={artwork}
        presentLg={presentLg}
        presentXl={presentXl}
      />
    </>
  )
}

// Auto-mount if the Blade view provided data attributes
const el = document.getElementById('artwork-page')
if (el) {
  const parse = (key, fallback = null) => {
    try {
      return JSON.parse(el.dataset[key] || 'null') ?? fallback
    } catch {
      return fallback
    }
  }

  const root = createRoot(el)
  root.render(
    <ArtworkPage
      artwork={parse('artwork')}
      related={parse('related', [])}
      presentMd={parse('presentMd')}
      presentLg={parse('presentLg')}
      presentXl={parse('presentXl')}
      presentSq={parse('presentSq')}
      canonicalUrl={parse('canonical', '')}
      isAuthenticated={parse('isAuthenticated', false)}
      comments={parse('comments', [])}
    />,
  )
}

export default ArtworkPage