'use client'

import { useEffect, useRef, useState } from 'react'
import { useTranslations } from 'next-intl'
import {
  motion,
  useScroll,
  useTransform,
  useMotionValueEvent,
  useReducedMotion,
} from 'framer-motion'
import UnitRevealOverlay from './UnitRevealOverlay'

const TOTAL_FRAMES = 299
const FRAME_PATH = (n: number) =>
  `/frames/ezgif-frame-${String(n).padStart(3, '0')}.jpg`

// Scroll aralığına göre opacity döndüren helper
function usePhaseOpacity(
  scrollYProgress: ReturnType<typeof useScroll>['scrollYProgress'],
  inStart: number,
  inEnd: number,
  outStart: number,
  outEnd: number
) {
  return useTransform(
    scrollYProgress,
    [inStart, inEnd, outStart, outEnd],
    [0, 1, 1, 0]
  )
}

export default function CloudRevealSection() {
  const t = useTranslations('hero')
  const prefersReducedMotion = useReducedMotion()
  const sectionRef = useRef<HTMLDivElement>(null)
  const canvasRef = useRef<HTMLCanvasElement>(null)
  const framesRef = useRef<HTMLImageElement[]>([])
  const currentFrameRef = useRef(0)
  const [loaded, setLoaded] = useState(false)
  const [loadProgress, setLoadProgress] = useState(0)
  const hasSnapped = useRef(false)
  const [activeUnit, setActiveUnit] = useState<{ id: string; label: string; sub: string } | null>(null)

  const { scrollYProgress } = useScroll({
    target: sectionRef,
    offset: ['start start', 'end end'],
  })

  // Progress bar
  const progressScaleX = useTransform(scrollYProgress, [0, 1], [0, 1])

  // --- Text phase opacities ---
  // Phase 1: 0–15% → tagline (sol alt)
  const phase1Opacity = useTransform(scrollYProgress, [0, 0.05, 0.12, 0.18], [0, 1, 1, 0])
  const phase1Y = useTransform(scrollYProgress, [0, 0.05], [20, 0])

  // Phase 2: 20–45% → orta metin (merkez)
  const phase2Opacity = useTransform(scrollYProgress, [0.20, 0.28, 0.40, 0.48], [0, 1, 1, 0])
  const phase2Y = useTransform(scrollYProgress, [0.20, 0.28], [30, 0])

  // Phase 3: 50–72% → stat kartları (sağ)
  const phase3Opacity = useTransform(scrollYProgress, [0.50, 0.57, 0.68, 0.75], [0, 1, 1, 0])
  const phase3Y = useTransform(scrollYProgress, [0.50, 0.57], [30, 0])

  // Phase 4: 78–100% → CTA (merkez alt)
  const phase4Opacity = useTransform(scrollYProgress, [0.78, 0.85, 0.95, 1], [0, 1, 1, 0])
  const phase4Y = useTransform(scrollYProgress, [0.78, 0.85], [30, 0])

  // Frame preload
  useEffect(() => {
    if (prefersReducedMotion) return
    const images: HTMLImageElement[] = new Array(TOTAL_FRAMES)
    let loadedCount = 0
    let cancelled = false

    for (let i = 0; i < TOTAL_FRAMES; i++) {
      const img = new Image()
      img.src = FRAME_PATH(i + 1)
      img.onload = () => {
        if (cancelled) return
        loadedCount++
        setLoadProgress(Math.round((loadedCount / TOTAL_FRAMES) * 100))
        if (loadedCount === TOTAL_FRAMES) {
          framesRef.current = images
          setLoaded(true)
          drawFrame(0, images)
        }
      }
      images[i] = img
    }
    return () => { cancelled = true }
  }, [prefersReducedMotion])

  function drawFrame(index: number, images?: HTMLImageElement[]) {
    const canvas = canvasRef.current
    if (!canvas) return
    const ctx = canvas.getContext('2d')
    if (!ctx) return
    const imgs = images || framesRef.current
    const img = imgs[index]
    if (!img || !img.complete || img.naturalWidth === 0) return
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height)
  }

  useMotionValueEvent(scrollYProgress, 'change', (progress) => {
    if (!loaded) return
    const frameIndex = Math.min(Math.floor(progress * (TOTAL_FRAMES - 1)), TOTAL_FRAMES - 1)
    if (frameIndex !== currentFrameRef.current) {
      currentFrameRef.current = frameIndex
      drawFrame(frameIndex)
    }
  })

  // Scroll pozisyonunu hero sonunda kilitle
  useEffect(() => {
    const lockScroll = () => {
      const section = sectionRef.current
      if (!section) return
      // Hero'nun scroll edebileceği maksimum pozisyon
      const maxY = section.offsetTop + section.offsetHeight - window.innerHeight
      if (window.scrollY > maxY) {
        window.scrollTo({ top: maxY, behavior: 'instant' })
      }
    }
    window.addEventListener('scroll', lockScroll, { passive: true })
    return () => window.removeEventListener('scroll', lockScroll)
  }, [])

  useEffect(() => {
    const canvas = canvasRef.current
    if (!canvas) return
    const resize = () => {
      canvas.width = window.innerWidth
      canvas.height = window.innerHeight
      drawFrame(currentFrameRef.current)
    }
    resize()
    window.addEventListener('resize', resize)
    return () => window.removeEventListener('resize', resize)
  }, [loaded])

  if (prefersReducedMotion) {
    return (
      <div className="relative min-h-[100dvh] w-full overflow-hidden bg-black flex items-end">
        <div className="absolute inset-0 bg-gradient-to-t from-black/70 via-transparent to-transparent" />
        <div className="relative z-10 px-10 pb-24">
          <p className="text-white/50 text-xs tracking-[0.4em] uppercase mb-4">Vesta Muğla</p>
          <h1 className="text-white text-5xl md:text-7xl font-serif font-light leading-tight">{t('tagline')}</h1>
          <p className="text-white/50 mt-4 text-base font-light max-w-md">{t('subtitle')}</p>
        </div>
      </div>
    )
  }

  return (
    <>
    <div ref={sectionRef} style={{ height: '500vh' }}>
      <div className="sticky top-0 min-h-[100dvh] w-full overflow-hidden bg-black">

        {/* Canvas */}
        <canvas ref={canvasRef} className="absolute inset-0 w-full h-full" />

        {/* Alt gradient */}
        <div className="absolute inset-0 bg-gradient-to-t from-black/60 via-transparent to-transparent pointer-events-none" />

        {/* Loading */}
        {!loaded && (
          <div className="absolute inset-0 flex flex-col items-center justify-center bg-black z-20">
            <div className="w-48 h-px bg-white/10 mb-3">
              <div className="h-full bg-white/60 transition-all duration-150" style={{ width: `${loadProgress}%` }} />
            </div>
            <p className="text-white/30 text-xs tracking-widest uppercase">{loadProgress}%</p>
          </div>
        )}

        {/* PHASE 1 — Sol alt: Ana tagline */}
        <motion.div
          style={{ opacity: phase1Opacity, y: phase1Y }}
          className="absolute bottom-20 left-10 z-10 max-w-sm"
        >
          <p className="text-white/50 text-[10px] tracking-[0.4em] uppercase mb-3">Vesta Muğla</p>
          <h1 className="text-white text-4xl md:text-5xl font-serif font-light leading-tight drop-shadow-2xl">
            {t('tagline')}
          </h1>
          <p className="text-white/50 mt-3 text-sm font-light">{t('subtitle')}</p>
        </motion.div>

        {/* PHASE 2 — Merkez: Konum & kimlik */}
        <motion.div
          style={{ opacity: phase2Opacity, y: phase2Y }}
          className="absolute inset-0 flex items-center justify-center z-10 pointer-events-none"
        >
          <div className="text-center px-6">
            <p className="text-white/40 text-[10px] tracking-[0.5em] uppercase mb-5">Muğla · Türkiye</p>
            <p className="text-white text-3xl md:text-5xl font-serif font-light leading-snug drop-shadow-2xl">
              Bulutların altında,<br />
              <span className="italic">ormanın içinde</span>
            </p>
            <div className="mt-6 w-12 h-px bg-white/30 mx-auto" />
          </div>
        </motion.div>

        {/* PHASE 3 — Sağ: Stat rakamları */}
        <motion.div
          style={{ opacity: phase3Opacity, y: phase3Y }}
          className="absolute right-10 top-1/2 -translate-y-1/2 z-10 flex flex-col gap-8 text-right"
        >
          {[
            { value: '120', label: 'Konut' },
            { value: '15.000', label: 'm² Alan' },
            { value: '%60', label: 'Yeşil Alan' },
          ].map((stat) => (
            <div key={stat.label}>
              <p className="text-white text-4xl md:text-5xl font-serif font-light drop-shadow-xl">{stat.value}</p>
              <p className="text-white/40 text-xs tracking-widest uppercase mt-1">{stat.label}</p>
            </div>
          ))}
        </motion.div>

        {/* PHASE 4 — Merkez alt: CTA */}
        <motion.div
          style={{ opacity: phase4Opacity, y: phase4Y }}
          className="absolute bottom-24 left-0 right-0 z-10 flex flex-col items-center gap-4"
        >
          <p className="text-white/40 text-[10px] tracking-[0.5em] uppercase">Projeyi Keşfet</p>
          <p className="text-white text-2xl md:text-3xl font-serif font-light text-center drop-shadow-xl">
            Hayalinizdeki yaşam<br />bir adım uzağınızda
          </p>
          <div className="mt-2 w-px h-10 bg-white/30 animate-pulse" />
        </motion.div>

        {/* HOTSPOTS — son frame'de görünür */}
        <UnitHotspots
          scrollYProgress={scrollYProgress}
          onSelect={(unit) => setActiveUnit(unit)}
        />

        {/* Progress bar */}
        <div className="absolute bottom-8 left-10 right-10 z-10 h-[2px] bg-white/10">
          <motion.div className="h-full bg-white/60 origin-left" style={{ scaleX: progressScaleX }} />
        </div>

      </div>
    </div>

    {/* Unit reveal overlay */}
    <UnitRevealOverlay
      unitId={activeUnit?.id ?? null}
      unitLabel={activeUnit?.label ?? ''}
      unitSub={activeUnit?.sub ?? ''}
      onClose={() => setActiveUnit(null)}
    />
    </>
  )
}

// ─── Hotspot bileşeni ────────────────────────────────────────────────────────

const HOTSPOTS: {
  id: string
  label: string
  sub: string
  x: number   // dot pozisyonu — ekranın % yatay
  y: number   // dot pozisyonu — ekranın % dikey
  dir: 'left' | 'right'  // kartın hangi tarafa uzayacağı
}[] = [
  { id: 'blok-a', label: '2+1 Daire', sub: 'Blok A · 89 m²', x: 34, y: 22, dir: 'left' },
  { id: 'blok-b', label: '2+1 Daire', sub: 'Blok B · 84 m²', x: 70, y: 19, dir: 'right' },
  { id: 'blok-c', label: '1+1 Daire', sub: 'Blok C · 60 m²', x: 50, y: 55, dir: 'right' },
  { id: 'blok-d', label: '1+1 Daire', sub: 'Blok D · 47 m²', x: 20, y: 65, dir: 'left' },
]

function UnitHotspots({
  scrollYProgress,
  onSelect,
}: {
  scrollYProgress: ReturnType<typeof useScroll>['scrollYProgress']
  onSelect: (unit: { id: string; label: string; sub: string }) => void
}) {
  const containerOpacity = useTransform(scrollYProgress, [0.92, 0.98], [0, 1])

  return (
    <motion.div
      style={{ opacity: containerOpacity }}
      className="absolute inset-0 z-20 pointer-events-none"
    >
      {HOTSPOTS.map((spot, i) => (
        <div
          key={spot.id}
          className="absolute"
          style={{ left: `${spot.x}%`, top: `${spot.y}%` }}
        >
          {/* Dot + çizgi + kart — yatay flex */}
          <div className={`flex items-center gap-0 ${spot.dir === 'left' ? 'flex-row-reverse' : 'flex-row'}`}>

            {/* Pulsing dot */}
            <span className="relative flex h-3 w-3 shrink-0">
              <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-white opacity-70" />
              <span className="relative inline-flex rounded-full h-3 w-3 bg-white" />
            </span>

            {/* Animated çizgi */}
            <motion.div
              className="h-px bg-white/60 shrink-0"
              initial={{ width: 0 }}
              animate={{ width: 48 }}
              transition={{ delay: i * 0.2 + 0.1, duration: 0.4, ease: 'easeOut' }}
            />

            {/* Ok ucu */}
            <motion.div
              initial={{ opacity: 0, x: spot.dir === 'right' ? -4 : 4 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: i * 0.2 + 0.4, duration: 0.2 }}
              className="shrink-0 text-white/60"
            >
              {spot.dir === 'right'
                ? <svg width="6" height="8" viewBox="0 0 6 8" fill="none"><path d="M1 1l4 3-4 3" stroke="white" strokeWidth="1.2" strokeLinecap="round" strokeLinejoin="round"/></svg>
                : <svg width="6" height="8" viewBox="0 0 6 8" fill="none"><path d="M5 1L1 4l4 3" stroke="white" strokeWidth="1.2" strokeLinecap="round" strokeLinejoin="round"/></svg>
              }
            </motion.div>

            {/* Kart */}
            <motion.button
              initial={{ opacity: 0, x: spot.dir === 'right' ? -8 : 8 }}
              animate={{ opacity: 1, x: 0 }}
              transition={{ delay: i * 0.2 + 0.45, duration: 0.3, ease: 'easeOut' }}
              className="pointer-events-auto bg-black/60 backdrop-blur-md border border-white/20 rounded-lg px-3 py-2 text-left hover:bg-black/80 hover:border-white/40 transition-all duration-200 active:scale-95 cursor-pointer"
              onClick={() => onSelect({ id: spot.id, label: spot.label, sub: spot.sub })}
            >
              <p className="text-white text-xs font-medium tracking-wide whitespace-nowrap">{spot.label}</p>
              <p className="text-white/50 text-[10px] mt-0.5 whitespace-nowrap">{spot.sub}</p>
              <div className="mt-1.5 flex items-center gap-1 text-white/40 text-[10px] tracking-widest uppercase">
                <span>İncele</span>
                <svg width="8" height="8" viewBox="0 0 8 8" fill="none">
                  <path d="M1 4h6M4 1l3 3-3 3" stroke="currentColor" strokeWidth="1" strokeLinecap="round"/>
                </svg>
              </div>
            </motion.button>

          </div>
        </div>
      ))}
    </motion.div>
  )
}
