'use client'

import { motion, type Variants } from 'framer-motion'
import Link from 'next/link'
import { Button } from '@/components/ui/button'
import {
  Check, ArrowRight, Shield, Search, FileCheck, TrendingUp,
  Target, Filter, Bell, Eye, Slack, Webhook, History,
  Zap, Lock, ChevronRight, Star, Accessibility
} from 'lucide-react'
import { useState, useEffect } from 'react'
import { SEODemoVisual } from './SEODemoVisual'
import { CompetitorDemoVisual } from './CompetitorDemoVisual'
import { PolicyDemoVisual } from './PolicyDemoVisual'
import { WaitlistForm } from './WaitlistForm'
import { MagneticButton } from './MagneticElements'
import { BackgroundGradient, FloatingElements, InteractiveGrid, GlowEffect, SectionDivider } from './BackgroundEffects'

// Animation Variants
const fadeInUp: Variants = {
  hidden: { opacity: 0, y: 30, filter: 'blur(4px)' },
  visible: (i: number = 0) => ({
    opacity: 1,
    y: 0,
    filter: 'blur(0px)',
    transition: {
      delay: i * 0.15,
      duration: 0.7,
      ease: [0.22, 1, 0.36, 1]
    }
  })
}

// ============================================
// 1. HERO SECTION
// ============================================
export function HeroSection() {
  return (
    <section id="hero" className="relative overflow-hidden pt-32 pb-24 lg:pt-40 lg:pb-32 gradient-velvet">
      {/* Background Elements */}
      <div className="absolute inset-0 grain-texture" />
      <div className="absolute right-0 top-20 -z-10 h-[600px] w-[600px] rounded-full bg-[hsl(var(--primary))] opacity-8 blur-[120px]" />
      <div className="absolute left-0 bottom-0 -z-10 h-[400px] w-[400px] rounded-full bg-[hsl(var(--teal))] opacity-8 blur-[100px]" />

      <div className="mx-auto max-w-7xl px-6 relative z-10">
        <div className="grid lg:grid-cols-[60%_40%] gap-16 items-center">
          {/* Left: Content */}
          <motion.div
            initial="hidden"
            animate="visible"
            className="flex flex-col gap-8"
          >
            {/* Overline */}
            <motion.div variants={fadeInUp} custom={0}>
              <div className="inline-flex items-center gap-2 rounded-full bg-[hsl(var(--teal))]/10 border border-[hsl(var(--teal))]/20 px-4 py-1.5 text-sm font-medium text-[hsl(var(--teal))]">
                <span className="relative flex h-2 w-2">
                  <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-[hsl(var(--teal))] opacity-75"></span>
                  <span className="relative inline-flex rounded-full h-2 w-2 bg-[hsl(var(--teal))]"></span>
                </span>
                Website Change Monitor for SEO & Growth Teams
              </div>
            </motion.div>

            {/* Hero Headline */}
            <motion.h1
              variants={fadeInUp}
              custom={1}
              className="text-5xl lg:text-7xl font-display font-bold leading-[1.08] tracking-tight text-foreground"
            >
              Monitor website changes &{' '}
              <span className="text-[hsl(var(--primary))]">price drops automatically.</span>
            </motion.h1>

            {/* Subheadline */}
            <motion.p
              variants={fadeInUp}
              custom={2}
              className="text-xl lg:text-2xl text-muted-foreground font-body leading-relaxed max-w-2xl"
            >
              Less noise. More signal. Visual proof included.
            </motion.p>

            {/* Feature Bullets */}
            <motion.div
              variants={fadeInUp}
              custom={3}
              className="grid md:grid-cols-2 gap-4 max-w-2xl"
            >
              {[
                'Auto-filter cookie banners & timestamps',
                'Keyword alerts when it matters',
                'Slack/Webhook integration',
                'Audit-proof history & snapshots'
              ].map((feature, i) => (
                <div key={i} className="flex items-start gap-3">
                  <div className="mt-0.5 flex-shrink-0 flex h-5 w-5 items-center justify-center rounded-full bg-[hsl(var(--teal))]/20">
                    <Check className="h-3 w-3 text-[hsl(var(--teal))]" strokeWidth={3} />
                  </div>
                  <span className="text-foreground text-sm font-medium leading-tight">{feature}</span>
                </div>
              ))}
            </motion.div>

            {/* Waitlist Form */}
            <motion.div
              variants={fadeInUp}
              custom={4}
              className="w-full max-w-lg"
            >
              <WaitlistForm id="waitlist-form" />
            </motion.div>

            {/* Trust Signals */}
            <motion.div
              variants={fadeInUp}
              custom={5}
              className="flex flex-wrap items-center gap-6 text-sm text-muted-foreground"
            >
              <div className="flex items-center gap-2">
                <Lock className="h-4 w-4" />
                <span>No credit card</span>
              </div>
              <span>•</span>
              <div className="flex items-center gap-2">
                <Shield className="h-4 w-4" />
                <span>No spam, ever</span>
              </div>
              <span>•</span>
              <div className="flex items-center gap-2">
                <Star className="h-4 w-4 fill-current" />
                <span>Early access</span>
              </div>
            </motion.div>
          </motion.div>

          {/* Right: Animated Visual - Noise → Signal */}
          <motion.div
            initial={{ opacity: 0, x: 40 }}
            animate={{ opacity: 1, x: 0 }}
            transition={{ duration: 0.9, delay: 0.3 }}
            className="relative"
          >
            <NoiseToSignalVisual />
          </motion.div>
        </div>
      </div>
    </section>
  )
}

// ============================================
// 1b. TRUST SECTION - "As seen on..."
// ============================================
function TrustSectionDeprecated() {
  const logos = [
    { name: 'SEO Clarity', color: 'text-muted-foreground' },
    { name: 'Search Engine Journal', color: 'text-muted-foreground' },
    { name: 'Moz', color: 'text-muted-foreground' },
    { name: 'Ahrefs', color: 'text-muted-foreground' },
    { name: 'Semrush', color: 'text-muted-foreground' }
  ]

  return (
    <section className="py-12 border-y border-border/50 bg-secondary/10">
      <div className="mx-auto max-w-7xl px-6">
        <p className="text-center text-[10px] font-bold uppercase tracking-[0.2em] text-muted-foreground/80 mb-8">
          The Essential Toolkit for Industry Leaders
        </p>
        <div className="flex flex-wrap justify-center items-center gap-x-12 gap-y-8 opacity-40 grayscale hover:grayscale-0 transition-all duration-700">
          {logos.map((logo, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0 }}
              whileInView={{ opacity: 1 }}
              viewport={{ once: true }}
              transition={{ delay: i * 0.1, duration: 0.8 }}
              className={`text-xl font-display font-black tracking-tighter ${logo.color}`}
            >
              {logo.name}
            </motion.div>
          ))}
        </div>
      </div>
    </section>
  )
}

// Noise → Signal Animation Component
function NoiseToSignalVisual() {
  const [phase, setPhase] = useState(0)
  const [isPaused, setIsPaused] = useState(false)
  const [particles, setParticles] = useState<{ id: number; x: number; y: number }[]>([])

  useEffect(() => {
    if (isPaused) return
    const interval = setInterval(() => {
      setPhase(p => {
        const nextPhase = (p + 1) % 4
        if (p === 0 && nextPhase === 1) {
          triggerParticles()
        }
        return nextPhase
      })
    }, 2500)
    return () => clearInterval(interval)
  }, [isPaused])

  const triggerParticles = () => {
    const newParticles = Array.from({ length: 8 }, (_, i) => ({
      id: Date.now() + i,
      x: Math.random() * 100,
      y: Math.random() * 100
    }))
    setParticles(newParticles)
    setTimeout(() => setParticles([]), 1000)
  }

  return (
    <motion.div
      className="relative aspect-[4/3] min-h-[320px] rounded-3xl border-2 border-border bg-card/50 backdrop-blur-sm shadow-2xl overflow-hidden cursor-pointer group"
      style={{ perspective: '1000px' }}
      whileHover={{ rotateY: 2, rotateX: -2, scale: 1.02 }}
      transition={{ duration: 0.3 }}
      onHoverStart={() => setIsPaused(true)}
      onHoverEnd={() => setIsPaused(false)}
    >
      {/* Pulsing Glow Border */}
      {phase >= 1 && (
        <motion.div
          className="absolute inset-0 rounded-3xl"
          animate={{
            boxShadow: [
              '0 0 0px hsl(var(--teal))',
              '0 0 20px hsl(var(--teal) / 0.5)',
              '0 0 0px hsl(var(--teal))'
            ]
          }}
          transition={{ duration: 2, repeat: Infinity }}
        />
      )}

      {/* Particles */}
      {particles.map(particle => (
        <motion.div
          key={particle.id}
          className="absolute w-1 h-1 rounded-full bg-[hsl(var(--teal))]"
          initial={{ x: `${particle.x}%`, y: `${particle.y}%`, opacity: 1, scale: 1 }}
          animate={{
            y: `${particle.y - 20}%`,
            opacity: 0,
            scale: 0
          }}
          transition={{ duration: 0.8 }}
        />
      ))}

      {/* Mock Browser Header */}
      <div className="flex items-center gap-2 border-b border-border bg-secondary/30 px-4 py-3">
        <div className="flex gap-1.5">
          <div className="h-2.5 w-2.5 rounded-full bg-red-400" />
          <div className="h-2.5 w-2.5 rounded-full bg-yellow-400" />
          <div className="h-2.5 w-2.5 rounded-full bg-green-400" />
        </div>
        <div className="flex-1 mx-4 px-3 py-1 rounded-md bg-background/50 text-xs text-muted-foreground font-mono text-center">
          competitor-site.com/pricing
        </div>
        {isPaused && (
          <motion.div
            initial={{ opacity: 0, scale: 0.8 }}
            animate={{ opacity: 1, scale: 1 }}
            className="text-[10px] text-muted-foreground font-medium"
          >
            PAUSED
          </motion.div>
        )}
      </div>

      {/* Content Area */}
      <div className="p-8 space-y-4 relative">
        <motion.div
          className="absolute top-4 left-4 px-3 py-1 rounded-full bg-background/80 backdrop-blur-sm border border-border text-xs font-mono font-semibold"
          animate={{
            opacity: phase === 0 ? 1 : 0.5,
            scale: phase === 0 ? 1 : 0.95
          }}
        >
          Noise: {phase === 0 ? '67%' : '0%'}
        </motion.div>

        {/* Phase 0: Noisy Page */}
        <motion.div
          animate={{
            opacity: phase === 0 ? 1 : 0,
            scale: phase === 0 ? 1 : 0.98
          }}
          transition={{ duration: 0.5 }}
          className="space-y-3"
        >
          <div className="flex items-center justify-between p-3 rounded-lg bg-muted/30 border border-border/40 relative overflow-hidden">
            <span className="text-xs text-muted-foreground">🍪 Cookie Banner</span>
            <span className="text-xs text-red-500 font-semibold">NOISE</span>
          </div>
          <div className="p-4 rounded-lg bg-background border border-border">
            <p className="text-sm font-semibold text-foreground mb-2">Enterprise Plan</p>
            <p className="text-2xl font-bold text-[hsl(var(--burgundy))]">$99/mo</p>
          </div>
          <div className="flex items-center justify-between p-3 rounded-lg bg-muted/30 border border-border/40 relative overflow-hidden">
            <span className="text-xs text-muted-foreground">⏰ Last updated: 10:23 AM</span>
            <span className="text-xs text-red-500 font-semibold">NOISE</span>
          </div>
        </motion.div>

        {/* Phase 1-3: Signal */}
        {phase >= 1 && (
          <motion.div
            initial={{ opacity: 0, scale: 0.85 }}
            animate={{ opacity: 1, scale: 1 }}
            className="absolute inset-0 flex items-center justify-center p-8"
          >
            <div className="w-full p-6 rounded-2xl bg-white dark:bg-zinc-950 border-2 border-[hsl(var(--teal))] shadow-2xl relative">
              <div className="flex items-center justify-between mb-2">
                <span className="text-xs font-bold uppercase tracking-wider text-[hsl(var(--teal))]">✓ SIGNAL DETECTED</span>
                <div className="flex items-center gap-1.5 text-xs text-[hsl(var(--teal))]">
                  <Filter className="h-3 w-3" /> Filtered
                </div>
              </div>
              <p className="text-sm font-semibold text-muted-foreground mb-3">Enterprise Plan</p>
              <div className="flex items-baseline gap-3">
                <p className="text-3xl font-bold text-foreground">$99/mo</p>
                {phase >= 2 && (
                  <motion.p
                    initial={{ opacity: 0, x: -10 }}
                    animate={{ opacity: 1, x: 0 }}
                    className="text-3xl text-[hsl(var(--burgundy))] font-bold"
                  >
                    → $79/mo
                  </motion.p>
                )}
              </div>
              {phase >= 3 && (
                <motion.div
                  initial={{ opacity: 0, y: 10 }}
                  animate={{ opacity: 1, y: 0 }}
                  className="mt-4 inline-flex items-center gap-2 px-3 py-1.5 rounded-full bg-[hsl(var(--burgundy))]/10 border border-[hsl(var(--burgundy))]/30"
                >
                  <Bell className="h-3 w-3 text-[hsl(var(--burgundy))]" />
                  <span className="text-[10px] font-bold text-[hsl(var(--burgundy))] uppercase tracking-wider">Alert Sent</span>
                </motion.div>
              )}
            </div>
          </motion.div>
        )}

        {/* Phase Indicator */}
        <div className="absolute bottom-4 right-4 flex gap-1.5">
          {[0, 1, 2, 3].map(i => (
            <div
              key={i}
              className={`h-1.5 rounded-full transition-all duration-300 ${phase === i ? 'w-6 bg-[hsl(var(--teal))]' : 'w-1.5 bg-border'}`}
            />
          ))}
        </div>
      </div>
    </motion.div>
  )
}

// ============================================
// 2. USE CASE SHOWCASE
// ============================================
export function UseCaseShowcase() {
  const useCases = [
    {
      icon: <Search className="h-7 w-7" />,
      title: 'SEO Monitoring',
      problem: 'Your rankings drop before you know why.',
      example: 'Track when competitors update meta descriptions or add new content sections that outrank you.',
      color: 'teal',
      demoComponent: <SEODemoVisual />
    },
    {
      icon: <TrendingUp className="h-7 w-7" />,
      title: 'Competitor Intelligence',
      problem: 'Competitor launches slip past your radar.',
      example: 'Monitor pricing pages, product launches, and promotional campaigns in real-time.',
      color: 'primary',
      demoComponent: <CompetitorDemoVisual />
    },
    {
      icon: <FileCheck className="h-7 w-7" />,
      title: 'Policy & Compliance',
      problem: 'Regulatory updates appear without warning.',
      example: 'Track policy changes, terms updates, and legal text modifications with audit-proof history.',
      color: 'burgundy',
      demoComponent: <PolicyDemoVisual />
    }
  ]

  return (
    <section className="py-32 relative overflow-hidden">
      <div className="absolute inset-0 bg-[linear-gradient(to_right,hsl(var(--border))_1px,transparent_1px),linear-gradient(to_bottom,hsl(var(--border))_1px,transparent_1px)] bg-[size:4rem_4rem] opacity-30 [mask-image:radial-gradient(ellipse_80%_50%_at_50%_50%,#000_70%,transparent_100%)]" />

      <div className="mx-auto max-w-7xl px-6 relative z-10">
        <div className="text-center mb-20">
          <motion.div
            initial={{ opacity: 0, y: 20 }}
            whileInView={{ opacity: 1, y: 0 }}
            viewport={{ once: true }}
            className="inline-flex items-center gap-2 rounded-full bg-secondary border border-border px-4 py-1.5 text-sm font-medium text-foreground mb-6"
          >
            <Eye className="h-4 w-4" /> Who This Is For
          </motion.div>
          <motion.h2
            initial={{ opacity: 0, y: 20 }}
            whileInView={{ opacity: 1, y: 0 }}
            viewport={{ once: true }}
            className="text-4xl lg:text-5xl font-display font-bold text-foreground mb-6"
          >
            Built for teams who need results, <span className="text-muted-foreground">not demos.</span>
          </motion.h2>
        </div>

        <div className="grid md:grid-cols-3 gap-8 max-w-6xl mx-auto">
          {useCases.map((useCase, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0, y: 40 }}
              whileInView={{ opacity: 1, y: 0 }}
              viewport={{ once: true }}
              transition={{ delay: i * 0.15 }}
              className="group relative glass-card rounded-3xl p-8 shadow-xl transition-all"
            >
              <div className={`inline-flex h-14 w-14 items-center justify-center rounded-2xl bg-[hsl(var(--${useCase.color}))]/10 text-[hsl(var(--${useCase.color}))] border border-[hsl(var(--${useCase.color}))]/20 mb-6`}>
                {useCase.icon}
              </div>
              <h3 className="text-2xl font-display font-bold text-foreground mb-4">{useCase.title}</h3>
              <p className="text-sm font-semibold text-muted-foreground mb-6">{useCase.problem}</p>
              <div className="rounded-xl overflow-hidden border border-border/50 shadow-inner mb-6 h-[280px]">
                {useCase.demoComponent}
              </div>
              <div className="pt-4 border-t border-border">
                <p className="text-xs uppercase tracking-wider font-bold text-muted-foreground mb-2">Example:</p>
                <p className="text-sm text-foreground leading-relaxed">{useCase.example}</p>
              </div>
            </motion.div>
          ))}
        </div>
      </div>
    </section>
  )
}

// ============================================
// 3. HOW IT WORKS
// ============================================
export function HowItWorks() {
  const stages = [
    { icon: <Target className="h-6 w-6" />, title: 'Set URL', desc: 'Add the page you want to monitor' },
    { icon: <Zap className="h-6 w-6" />, title: 'Check regularly', desc: 'Automated checks at your chosen frequency' },
    { icon: <Filter className="h-6 w-6" />, title: 'Remove noise', desc: 'AI filters out irrelevant changes' },
    { icon: <Bell className="h-6 w-6" />, title: 'Get alerted', desc: 'Receive notifications that matter' }
  ]

  return (
    <section className="py-32 relative overflow-hidden">
      <div className="mx-auto max-w-7xl px-6 relative z-10">
        <div className="text-center mb-20">
          <h2 className="text-4xl lg:text-5xl font-display font-bold text-foreground mb-6">How it works</h2>
          <p className="text-xl text-muted-foreground max-w-2xl mx-auto">Four simple steps to never miss an important change again.</p>
        </div>

        <div className="grid lg:grid-cols-4 gap-8">
          {stages.map((stage, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0, y: 30 }}
              whileInView={{ opacity: 1, y: 0 }}
              viewport={{ once: true }}
              transition={{ delay: i * 0.1 }}
              className="relative flex flex-col items-center text-center group"
            >
              <div className="absolute -top-4 left-1/2 -translate-x-1/2 text-8xl font-display font-bold text-border/20 pointer-events-none">
                {String(i + 1).padStart(2, '0')}
              </div>
              <div className="relative z-10 mb-6 flex h-20 w-20 items-center justify-center rounded-full border-2 border-border bg-card shadow-lg transition-all group-hover:border-[hsl(var(--primary))]">
                <div className="text-[hsl(var(--primary))]">{stage.icon}</div>
              </div>
              <h3 className="text-lg font-bold text-foreground mb-2">{stage.title}</h3>
              <p className="text-sm text-muted-foreground max-w-[200px]">{stage.desc}</p>
            </motion.div>
          ))}
        </div>
      </div>
    </section>
  )
}

// ============================================
// 4. DIFFERENTIATORS
// ============================================
export function Differentiators() {
  const features = [
    { feature: 'Noise Filtering', others: 'Basic', us: 'AI-powered + custom rules', icon: <Filter className="h-5 w-5" /> },
    { feature: 'Keyword Alerts', others: 'Limited', us: 'Regex + thresholds', icon: <Search className="h-5 w-5" /> },
    { feature: 'Integrations', others: 'Email only', us: 'Slack, Webhooks, Teams', icon: <Slack className="h-5 w-5" /> },
    { feature: 'History & Proof', others: '7-30 days', us: 'Unlimited snapshots', icon: <History className="h-5 w-5" /> },
    { feature: 'Setup Time', others: '15+ min', us: '2 minutes', icon: <Zap className="h-5 w-5" /> },
    { feature: 'Pricing', others: '$29-99/mo', us: 'Free plan + fair scaling', icon: <Shield className="h-5 w-5" /> }
  ]

  return (
    <section className="py-32 relative overflow-hidden">
      <div className="mx-auto max-w-6xl px-6 relative z-10">
        <div className="text-center mb-20">
          <h2 className="text-4xl lg:text-5xl font-display font-bold text-foreground mb-6">
            {"Why we're"} <span className="text-[hsl(var(--teal))]">different</span>
          </h2>
          <p className="text-xl text-muted-foreground max-w-2xl mx-auto">{"Not all monitoring tools are created equal. Here's what sets us apart."}</p>
        </div>

        <div className="grid md:grid-cols-2 lg:grid-cols-3 gap-6">
          {features.map((item, i) => (
            <motion.div
              key={i}
              initial={{ opacity: 0, scale: 0.95 }}
              whileInView={{ opacity: 1, scale: 1 }}
              viewport={{ once: true }}
              transition={{ delay: i * 0.05 }}
              className="glass-card rounded-2xl p-6 hover:border-[hsl(var(--teal))]/30 transition-all"
            >
              <div className="inline-flex h-12 w-12 items-center justify-center rounded-xl bg-[hsl(var(--teal))]/10 text-[hsl(var(--teal))] mb-4">
                {item.icon}
              </div>
              <h3 className="text-lg font-bold text-foreground mb-4">{item.feature}</h3>
              <div className="space-y-3">
                <div className="flex items-start gap-2">
                  <span className="text-xs uppercase tracking-wider font-bold text-muted-foreground flex-shrink-0 mt-0.5">Others:</span>
                  <span className="text-sm text-muted-foreground">{item.others}</span>
                </div>
                <div className="flex items-start gap-2 p-3 rounded-lg bg-[hsl(var(--teal))]/5 border border-[hsl(var(--teal))]/20">
                  <Check className="h-4 w-4 text-[hsl(var(--teal))] flex-shrink-0 mt-0.5" strokeWidth={3} />
                  <span className="text-sm font-semibold text-foreground">{item.us}</span>
                </div>
              </div>
            </motion.div>
          ))}
        </div>
      </div>
    </section>
  )
}

// ============================================
// 6. FINAL CTA
// ============================================
export function FinalCTA() {
  return (
    <section className="relative overflow-hidden py-32">
      <div className="absolute inset-0 gradient-velvet opacity-90" />
      <div className="absolute inset-0 grain-texture" />

      <div className="mx-auto max-w-4xl px-6 text-center relative z-10">
        <motion.div
          initial={{ opacity: 0, y: 20 }}
          whileInView={{ opacity: 1, y: 0 }}
          viewport={{ once: true }}
          className="space-y-8"
        >
          <h2 className="text-5xl lg:text-6xl font-display font-bold leading-tight text-foreground">
            Stop missing the changes <span className="text-[hsl(var(--primary))]">that matter.</span>
          </h2>
          <p className="text-xl lg:text-2xl text-muted-foreground max-w-2xl mx-auto">
            Join the waitlist and be first to experience monitoring that actually works.
          </p>
          <div className="pt-4 max-w-lg mx-auto">
            <WaitlistForm />
          </div>
          <div className="flex flex-wrap items-center justify-center gap-6 text-sm text-muted-foreground">
            <div className="flex items-center gap-2">
              <Star className="h-4 w-4 fill-current text-[hsl(var(--primary))]" />
              <span>Join the waitlist for early access</span>
            </div>
          </div>
        </motion.div>
      </div>
    </section>
  )
}