'use client'

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

const HERO_VIDEO = '/hero/hero.mp4'

export default function CloudRevealSection() {
  const t = useTranslations('hero')
  const prefersReducedMotion = useReducedMotion()
  const sectionRef = useRef<HTMLDivElement>(null)
  const canvasRef = useRef<HTMLCanvasElement>(null)
  const videoRef = useRef<HTMLVideoElement | null>(null)
  const curTimeRef = useRef(0)       // lerp'in anlık değeri
  const targetTimeRef = useRef(0)    // scroll'un hedef değeri
  const [loaded, setLoaded] = useState(false)
  const [loadProgress, setLoadProgress] = useState(0)
  const [activeUnit, setActiveUnit] = useState<{ id: string; label: string; sub: string } | null>(null)

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

  const progressScaleX = useTransform(scrollYProgress, [0, 1], [0, 1])
  const logoOpacity = useTransform(scrollYProgress, [0, 0.02, 0.08, 0.14], [0, 1, 1, 0])
  const logoScale   = useTransform(scrollYProgress, [0, 0.02], [0.92, 1])
  const phase1Opacity = useTransform(scrollYProgress, [0, 0.05, 0.12, 0.18], [0, 1, 1, 0])
  const phase1Y       = useTransform(scrollYProgress, [0, 0.05], [20, 0])
  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])
  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])
  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])

  // Canvas boyutu
  useEffect(() => {
    const canvas = canvasRef.current
    if (!canvas) return
    const resize = () => { canvas.width = window.innerWidth; canvas.height = window.innerHeight }
    resize()
    window.addEventListener('resize', resize)
    return () => window.removeEventListener('resize', resize)
  }, [])

  // Blob yükle → video → RAF loop
  useEffect(() => {
    if (prefersReducedMotion) return
    let cancelled = false
    let rafId: number

    const canvas = canvasRef.current
    const ctx = canvas?.getContext('2d')
    if (!canvas || !ctx) return

    // Blob fetch — progress ile
    fetch(HERO_VIDEO)
      .then(res => {
        if (!res.ok) throw new Error('fetch failed')
        const total = Number(res.headers.get('content-length') || 0)
        const reader = res.body!.getReader()
        const chunks: BlobPart[] = []
        let received = 0

        const pump = (): Promise<Blob> =>
          reader.read().then(({ done, value }) => {
            if (done) return new Blob(chunks, { type: 'video/mp4' })
            chunks.push(value!)
            received += value!.length
            if (total > 0) setLoadProgress(Math.round((received / total) * 100))
            return pump()
          })
        return pump()
      })
      .then(blob => {
        if (cancelled) return
        const url = URL.createObjectURL(blob)
        const v = document.createElement('video')
        v.muted = true
        v.playsInline = true
        v.preload = 'auto'
        v.src = url

        v.addEventListener('loadedmetadata', () => {
          if (cancelled) return
          videoRef.current = v
          setLoaded(true)

          // RAF loop: lerp curTime → targetTime, canvas'a çiz
          const loop = () => {
            if (v.readyState >= 2) {
              const eps = 0.008
              curTimeRef.current += (targetTimeRef.current - curTimeRef.current) * 0.18
              const t = Math.max(0, Math.min(curTimeRef.current, v.duration * 0.999))
              if (!v.seeking && Math.abs(v.currentTime - t) > eps) {
                try { v.currentTime = t } catch (_) {}
              }
              ctx.drawImage(v, 0, 0, canvas.width, canvas.height)
            }
            rafId = requestAnimationFrame(loop)
          }
          rafId = requestAnimationFrame(loop)
        })
      })
      .catch(() => {}) // sessizce yoksay

    return () => {
      cancelled = true
      cancelAnimationFrame(rafId)
      if (videoRef.current?.src?.startsWith('blob:')) URL.revokeObjectURL(videoRef.current.src)
      videoRef.current = null
    }
  }, [prefersReducedMotion])

  // Scroll → targetTime
  useEffect(() => {
    return scrollYProgress.on('change', (progress) => {
      const v = videoRef.current
      if (!v || !v.duration) return
      targetTimeRef.current = progress * v.duration
    })
  }, [scrollYProgress])

  // Scroll kilidi
  useEffect(() => {
    const lockScroll = () => {
      const section = sectionRef.current
      if (!section) return
      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)
  }, [])

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

        {/* LOGO */}
        <motion.div
          style={{ opacity: logoOpacity, scale: logoScale }}
          className="absolute inset-0 flex flex-col items-center justify-center z-10 pointer-events-none"
        >
          <p className="text-white text-5xl md:text-7xl font-serif font-light tracking-[0.25em] drop-shadow-2xl">VESTA</p>
          <div className="mt-3 w-16 h-px bg-white/40" />
          <p className="text-white/60 text-xs tracking-[0.5em] uppercase mt-3">Muğla</p>
        </motion.div>

        {/* PHASE 1 */}
        <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 */}
        <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 */}
        <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 */}
        <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>

        <UnitHotspots scrollYProgress={scrollYProgress} onSelect={(unit) => setActiveUnit(unit)} />

        <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>

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

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

const HOTSPOTS = [
  { id: 'blok-a', label: '2+1 Tip A', sub: 'Blok A · 83.35 m²', x: 52, y: 28, dir: 'left' as const },
  { id: 'blok-b', label: '2+1 Tip B', sub: 'Blok B · 84 m²',    x: 93, y: 30, dir: 'left' as const },
  { id: 'blok-c', label: '1+1',        sub: 'Blok C · 60 m²',    x: 11, y: 42, dir: 'right' as const },
]

function ZigzagLine({ dir, delay }: { dir: 'left' | 'right'; delay: number }) {
  const w = 72, h = 24
  const path = dir === 'right'
    ? `M0,${h/2} L${w*0.3},${h/2} L${w*0.45},4 L${w*0.6},${h-4} L${w*0.75},${h/2} L${w},${h/2}`
    : `M${w},${h/2} L${w*0.7},${h/2} L${w*0.55},4 L${w*0.4},${h-4} L${w*0.25},${h/2} L0,${h/2}`
  return (
    <svg width={w} height={h} viewBox={`0 0 ${w} ${h}`} fill="none" className="shrink-0">
      <motion.path d={path} stroke="rgba(255,255,255,0.65)" strokeWidth="1.2" strokeLinecap="round" strokeLinejoin="round"
        initial={{ pathLength: 0, opacity: 0 }} animate={{ pathLength: 1, opacity: 1 }}
        transition={{ delay, duration: 0.7, ease: 'easeInOut' }} />
    </svg>
  )
}

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}%` }}>
          <div className={`flex items-center gap-0 ${spot.dir === 'left' ? 'flex-row-reverse' : 'flex-row'}`}>
            <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>
            <ZigzagLine dir={spot.dir} delay={i * 0.25 + 0.1} />
            <motion.div initial={{ opacity: 0, x: spot.dir === 'right' ? -4 : 4 }} animate={{ opacity: 1, x: 0 }}
              transition={{ delay: i * 0.25 + 0.7, duration: 0.2 }} className="shrink-0">
              {spot.dir === 'right'
                ? <svg width="6" height="10" viewBox="0 0 6 10" fill="none"><path d="M1 1l4 4-4 4" stroke="white" strokeWidth="1.4" strokeLinecap="round" strokeLinejoin="round"/></svg>
                : <svg width="6" height="10" viewBox="0 0 6 10" fill="none"><path d="M5 1L1 5l4 4" stroke="white" strokeWidth="1.4" strokeLinecap="round" strokeLinejoin="round"/></svg>
              }
            </motion.div>
            <motion.button initial={{ opacity: 0, x: spot.dir === 'right' ? -8 : 8 }} animate={{ opacity: 1, x: 0 }}
              transition={{ delay: i * 0.25 + 0.75, 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>
  )
}
