import React, { useState, useCallback, useEffect } from 'react'
import { createRoot } from 'react-dom/client'
import axios from 'axios'
import ArtworkHero from '../components/artwork/ArtworkHero'
import ArtworkMeta from '../components/artwork/ArtworkMeta'
import ArtworkAwards from '../components/artwork/ArtworkAwards'
import ArtworkTags from '../components/artwork/ArtworkTags'
import ArtworkDescription from '../components/artwork/ArtworkDescription'
import ArtworkComments from '../components/artwork/ArtworkComments'
import ArtworkActionBar from '../components/artwork/ArtworkActionBar'
import ArtworkDetailsPanel from '../components/artwork/ArtworkDetailsPanel'
import CreatorSpotlight from '../components/artwork/CreatorSpotlight'
import ArtworkRecommendationsRails from '../components/artwork/ArtworkRecommendationsRails'
import ArtworkNavigator from '../components/viewer/ArtworkNavigator'
import ArtworkViewer from '../components/viewer/ArtworkViewer'
import ReactionBar from '../components/comments/ReactionBar'

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 })

  // Artwork-level reactions
  const [reactionTotals, setReactionTotals] = useState(null)
  useEffect(() => {
    if (!artwork?.id) return
    axios
      .get(`/api/artworks/${artwork.id}/reactions`)
      .then(({ data }) => setReactionTotals(data.totals ?? {}))
      .catch(() => setReactionTotals({}))
  }, [artwork?.id])

  /**
   * 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="pb-24 pt-6 lg:pb-12 lg:pt-8">
        {/* ── Hero ────────────────────────────────────────────────────── */}
        <div id="artwork-hero-anchor" className="mx-auto w-full max-w-screen-2xl px-3 sm:px-6 lg:px-8">
          <ArtworkHero
            artwork={artwork}
            presentMd={presentMd}
            presentLg={presentLg}
            presentXl={presentXl}
            onOpenViewer={openViewer}
            hasPrev={navState.hasPrev}
            hasNext={navState.hasNext}
            onPrev={navState.navigatePrev}
            onNext={navState.navigateNext}
          />
        </div>

        {/* ── Centered action bar with stat counts ────────────────────── */}
        <div className="mx-auto mt-5 w-full max-w-screen-xl px-4 sm:px-6 lg:px-8">
          <ArtworkActionBar
            artwork={artwork}
            stats={liveStats}
            canonicalUrl={canonicalUrl}
            onStatsChange={handleStatsChange}
          />
        </div>

        {/* ── Two-column content ──────────────────────────────────────── */}
        <div className="mx-auto mt-8 w-full max-w-screen-xl px-4 sm:px-6 lg:px-8">
          <div className="grid grid-cols-1 gap-8 lg:grid-cols-[minmax(0,1fr)_340px]">
            {/* LEFT COLUMN — main content */}
            <div className="relative z-10 min-w-0 space-y-5">
              {/* Title + author + breadcrumbs */}
              <ArtworkMeta artwork={artwork} />

              {/* Description */}
              <ArtworkDescription artwork={artwork} />

              {/* Artwork reactions */}
              {reactionTotals !== null && (
                <ReactionBar
                  entityType="artwork"
                  entityId={artwork.id}
                  initialTotals={reactionTotals}
                  isLoggedIn={isAuthenticated}
                />
              )}

              {/* Tags & categories */}
              <ArtworkTags artwork={artwork} />

              {/* Comments */}
              <ArtworkComments
                artworkId={artwork.id}
                comments={comments}
                isLoggedIn={isAuthenticated}
                loginUrl="/login"
              />
            </div>

            {/* RIGHT COLUMN — sidebar */}
            <aside className="space-y-5 lg:sticky lg:top-6 lg:self-start">
              {/* Creator card */}
              <CreatorSpotlight artwork={artwork} presentSq={presentSq} related={related} />

              {/* Details (collapsible) */}
              <ArtworkDetailsPanel artwork={artwork} stats={liveStats} />

              {/* Awards */}
              <ArtworkAwards artwork={artwork} initialAwards={initialAwards} isAuthenticated={isAuthenticated} />
            </aside>
          </div>
        </div>

        {/* ── Full-width recommendation rails ─────────────────────────── */}
        <div className="mt-14 w-full max-w-screen-2xl mx-auto">
          <ArtworkRecommendationsRails artwork={artwork} related={related} />
        </div>
      </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