'use client'

import { useEffect, useMemo, useState } from 'react'
import { useResponsiveCarousel } from '@/hooks/useResponsiveCarousel';
import { motion, AnimatePresence } from 'framer-motion'
import { wrap } from 'popmotion'
import { Button } from '@/components/Button';
import { SectionHeader, P, Eyebrow, CP } from '@/components/Texts';
import { TypeAnimation } from 'react-type-animation'
import { FadeIn } from '@/components/FadeIn';

const galleryItems = [
  { text: 'Navigate and interact with any web interface', image: '/images/gallery/interface.jpg', width: 448, height: 277 },
  { text: 'Process documents across all formats', image: '/images/gallery/docs.jpg', width: 448, height: 277 },
  { text: 'Execute multi-step workflows autonomously', image: '/images/gallery/flow.jpg', width: 448, height: 277 },
  { text: 'Manage calendars, emails, and tasks', image: '/images/gallery/calendar.jpg', width: 448, height: 277 },
  { text: 'Perform deep semantic search across all data sources', image: '/images/gallery/data.jpg', width: 448, height: 277 },
  { text: 'Identify patterns in complex datasets', image: '/images/gallery/datasets.jpg', width: 448, height: 277 },
  { text: 'Provide real-time market intelligence', image: '/images/gallery/market.jpg', width: 448, height: 277 },
  { text: 'Generate and debug code in multiple languages', image: '/images/gallery/code.jpg', width: 448, height: 277 },
  { text: 'Create consistent branded content', image: '/images/gallery/branding.jpg', width: 448, height: 277 },
  { text: 'Translate and localize materials', image: '/images/gallery/translate.jpg', width: 448, height: 277 },
  { text: 'Transform and migrate data structures', image: '/images/gallery/structure.jpg', width: 448, height: 277 },
]

// 🔧 Carousel Config
const VISIBLE = 4;
const AUTOPLAY_MS = 3200;

export function GallerySection() {
  const [active, setActive] = useState(0);
  const [hovering, setHovering] = useState(false);
  const { GAP, ROT_Y, DEPTH, SCALE_DROP } = useResponsiveCarousel();

  // autoplay
  useEffect(() => {
    if (hovering) return
    const id = setInterval(() => setActive((i) => wrap(0, galleryItems.length, i + 1)), AUTOPLAY_MS)
    return () => clearInterval(id)
  }, [hovering])

  const indices = useMemo(
    () => [...Array(VISIBLE * 2 + 1)].map((_, i) => wrap(0, galleryItems.length, active + i - VISIBLE)),
    [active]
  )

  const next = () => setActive((i) => wrap(0, galleryItems.length, i + 1))
  const prev = () => setActive((i) => wrap(0, galleryItems.length, i - 1))

  return (
    <div className="bg-white">
      <div className="relative isolate pt-8 pb-0 text-center w-full">
        <FadeIn transition={{ duration: 0.8, delay: 0.1 }}>
          <div className="mx-auto max-w-5xl lg:mt-12">
            <Eyebrow color="accent">Use Cases</Eyebrow>
            <SectionHeader className="text-center" color="dark">Agents with Endless Possibilities.</SectionHeader>
          </div>
        </FadeIn>
        <FadeIn transition={{ duration: 0.8, delay: 0.2 }}>
          <div className="mx-auto max-w-4xl mt-6 lg:px-0 px-4">
            <P className="text-center" color="dark">
            Your private agent coordinates a team of specialists that spin up on demand, collaborate across your world, and deliver end-to-end results.
            Many agents, one intelligence—yours.
            </P>
          </div>
        </FadeIn>
      </div>
      <FadeIn transition={{ duration: 1, delay: 0.4 }}>
        <section
          className="relative w-full flex items-center justify-center overflow-hidden -mt-8 pt-0 pb-0"
          onMouseEnter={() => setHovering(true)}
          onMouseLeave={() => setHovering(false)}
        >
                    <div className="relative w-full max-w-[1800px] h-[300px] md:h-[500px]" style={{ perspective: '1600px' }}>
            <div className="absolute inset-0" style={{ transformStyle: 'preserve-3d' }}>
              <AnimatePresence initial={false}>
                {indices.map((idx, i) => {
                  const distance = i - VISIBLE;
                  const item = galleryItems[idx];

                  const x = distance * GAP;
                  const z = -Math.abs(distance) * DEPTH;
                  const r = distance * ROT_Y;
                  const s = 1 - Math.abs(distance) * SCALE_DROP;
                  const o = distance === 0 ? 1 : 0.80;
                  const zIndex = 100 - Math.abs(distance);

                  return (
                    <motion.div
                      key={`${idx}-${i}`}
                      className={`absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 will-change-transform overflow-hidden ${distance === 0 ? 'rounded-xl' : ''}`}
                      initial={{ opacity: 0 }}
                      animate={{
                        transform: `translateX(${x}px) translateZ(${z}px) rotateY(${r}deg) scale(${s})`,
                        zIndex,
                        opacity: o,
                        boxShadow: distance === 0 ? '0 0 20px 5px rgba(0, 0, 0, 0.1)' : 'none',
                      }}
                      exit={{ opacity: 0 }}
                      transition={{ type: 'spring', stiffness: 220, damping: 26 }}
                      onClick={() => setActive(idx)}
                    >
                      <div className="relative bg-gray-100 flex items-center justify-center">
                        <img
                          src={item.image}
                          alt={item.text}
                          width={item.width}
                          height={item.height}
                          className="object-contain"
                        />
                      </div>
                    </motion.div>
                  );
                })}
              </AnimatePresence>
            </div>
          </div>

          {/* Arrows */}
          <div className="absolute inset-y-0 left-8 hidden md:flex items-center z-50">
            <button
              onClick={prev}
              className="bg-white/50 rounded-full p-2 shadow-lg backdrop-blur-md text-black"
              aria-label="Previous"
            >
              <svg className="size-8" viewBox="0 0 24 24" fill="none" dangerouslySetInnerHTML={{ __html: '<path d="M15 19L8 12l7-7" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"/>' }} />
            </button>
          </div>
          <div className="absolute inset-y-0 right-8 hidden md:flex items-center z-50">
            <button
              onClick={next}
              className="bg-white/50 rounded-full p-2 shadow-lg backdrop-blur-md text-black"
              aria-label="Next"
            >
              <svg className="size-8" viewBox="0 0 24 24" fill="none" dangerouslySetInnerHTML={{ __html: '<path d="M9 5l7 7-7 7" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round"/>' }} />
            </button>
          </div>

          {/* Foreground pill (Desktop) */}
          <div className="absolute left-1/2 top-1/2 -translate-x-1/2 -translate-y-1/2 z-[60] hidden md:block">
            <div className="flex items-center justify-between w-[1040px] gap-6 rounded-2xl bg-gray-100/80 shadow-[0_8px_40px_rgba(0,0,0,0.15)] px-12 backdrop-blur">
              <CP as="h4" className="max-w-[820px] h-[72px] flex items-center" color="dark">
                <TypeAnimation
                  key={active}
                  sequence={[galleryItems[active].text]}
                  wrapper="span"
                  speed={50}
                  repeat={0}
                />
              </CP>
              <Button href="#" color="cyan" className="text-sm px-4 py-2 lg:text-base whitespace-nowrap">
                Start
              </Button>
            </div>
          </div>
        </section>

        {/* Text box (Mobile) */}
        <div className="md:hidden w-full px-4 -mt-12 mb-16">
            <div className="flex flex-row items-center justify-between w-full gap-x-4 rounded-2xl bg-gray-100/80 p-4 backdrop-blur-md">
              <CP as="h4" className="w-full text-left h-[72px] leading-tight flex items-center" color="dark">
                <TypeAnimation
                  key={active}
                  sequence={[galleryItems[active].text]}
                  wrapper="span"
                  speed={50}
                  repeat={0}
                />
              </CP>
              <Button href="#" color="cyan" className="text-xs px-3 py-1.5 whitespace-nowrap">
                 Start
              </Button>
            </div>
        </div>
      </FadeIn>
    </div>
  );
}
