import Image from "next/image";
import { motion, AnimatePresence, animate } from "motion/react";
import { ChevronLeft, ChevronRight, Globe, ShieldCheck, Calendar, ArrowLeft } from "lucide-react";
import { useEffect, useState, useRef } from "react";
import { toPersian } from "../lib/utils";
import { useSettingsStore } from "../lib/store/settingsStore";
import { useRouter } from 'next/navigation';
import { Banner } from "../lib/types";
import { getMediaUrl } from "../lib/media";

function StatCounter({ target }: { target: number }) {
  const [displayValue, setDisplayValue] = useState(target);

  useEffect(() => {
    const controls = animate(0, target, {
      duration: 2,
      ease: [0.16, 1, 0.3, 1],
      onUpdate: (latest) => setDisplayValue(Math.round(latest))
    });
    return controls.stop;
  }, [target]);

  return (
    <div
      className="text-4xl lg:text-6xl font-black text-canina-blue font-vazir origin-right flex items-center min-w-[3ch]"
    >
      <span>
        {toPersian(displayValue)}+
      </span>
    </div>
  );
}

export default function Hero({ banners = [], onShopNavigate }: { banners?: Banner[]; onShopNavigate?: () => void }) {
  const router = useRouter();
  const getText = useSettingsStore((state) => state?.getText || ((_k: string, fb: string) => fb));
  const isInitialized = useSettingsStore((state) => state?.isInitialized ?? false);
  const [mounted, setMounted] = useState(false);
  const [currentSlide, setCurrentSlide] = useState(0);
  const [isPaused, setIsPaused] = useState(false);

  useEffect(() => {
    setMounted(true);
  }, []);

  const heroBanners = banners.filter(b => b.isActive !== false && b.imageUrl);
  const totalSlides = heroBanners.length;

  // Auto-advance slider
  useEffect(() => {
    if (totalSlides <= 1 || isPaused) return;
    const interval = setInterval(() => {
      setCurrentSlide(prev => (prev + 1) % totalSlides);
    }, 5000);
    return () => clearInterval(interval);
  }, [totalSlides, isPaused]);

  const activeBanner = totalSlides > 0 ? heroBanners[currentSlide] : null;

  const defaultTitle = activeBanner?.title || (banners.length > 0 && banners[0].title ? banners[0].title : "تخصص آلمانی در خدمت\nسلامت پت‌های خانگی");
  const defaultSubtitle = activeBanner?.subtitle || (banners.length > 0 && banners[0].subtitle ? banners[0].subtitle : 'از سال ۱۹۸۴، شرکت Canina pharma GmbH در برگیش گلادباخ آلمان، با بهره‌گیری از مواد اولیه طبیعی و فرآیندهای پیشرفته، استاندارد طلایی مکمل‌های دامپزشکی را تعریف می‌کند. کنینا نماینده رسمی این برند در ایران است.');

  const title = (mounted && isInitialized ? getText('hero_title', '') : '') || defaultTitle;
  const subtitle = (mounted && isInitialized ? getText('hero_desc', '') : '') || defaultSubtitle;
  const titleParts = title.split('\n');

  const rawHeroImg = (mounted && isInitialized ? getText('hero_image_url', '') : '');
  const sanitizedHeroImg = rawHeroImg.includes('hero-section-image.png') ? '' : rawHeroImg;
  const activeImageUrl = activeBanner?.imageUrl || sanitizedHeroImg || (banners.length > 0 && banners[0].imageUrl ? banners[0].imageUrl : "");

  const handleNextSlide = () => {
    if (totalSlides > 1) {
      setCurrentSlide(prev => (prev + 1) % totalSlides);
    }
  };

  const handlePrevSlide = () => {
    if (totalSlides > 1) {
      setCurrentSlide(prev => (prev - 1 + totalSlides) % totalSlides);
    }
  };

  const touchStartX = useRef<number | null>(null);
  const touchEndX = useRef<number | null>(null);
  const minSwipeDistance = 40;

  const onTouchStart = (e: React.TouchEvent) => {
    touchEndX.current = null;
    touchStartX.current = e.targetTouches[0].clientX;
  };

  const onTouchMove = (e: React.TouchEvent) => {
    touchEndX.current = e.targetTouches[0].clientX;
  };

  const onTouchEnd = () => {
    if (!touchStartX.current || !touchEndX.current) return;
    const distance = touchStartX.current - touchEndX.current;
    const isLeftSwipe = distance > minSwipeDistance;
    const isRightSwipe = distance < -minSwipeDistance;

    if (isRightSwipe) {
      handleNextSlide();
    } else if (isLeftSwipe) {
      handlePrevSlide();
    }
  };

  return (
    <section className="relative overflow-hidden bg-white py-3 sm:py-6 border-b border-medical-gray-100">
      {/* Background patterns */}
      <div className="absolute top-0 left-0 w-full h-full opacity-[0.03] pointer-events-none select-none overflow-hidden">
        <div className="absolute top-0 right-0 w-[800px] h-[800px] bg-canina-blue rounded-full blur-[120px] -mr-96 -mt-96" />
        <div className="absolute bottom-0 left-0 w-[600px] h-[600px] bg-medical-gray-500 rounded-full blur-[100px] -ml-40 -mb-40" />
      </div>

      <div className="max-w-7xl mx-auto px-4 relative flex flex-col lg:flex-row gap-4 sm:gap-12 mb-8 sm:mb-16 lg:mb-20">
        {/* Content */}
        <div className="lg:w-1/2 text-center lg:text-right">
          <div>
            <div className="inline-flex items-center gap-2 px-3 py-1 bg-canina-blue/5 border border-canina-blue/10 rounded-full mt-3 mb-3 sm:mb-5">
              <span className="w-2 h-2 rounded-full bg-canina-blue animate-pulse" />
              <span suppressHydrationWarning className="text-canina-blue text-xs font-bold uppercase tracking-widest leading-none">
                {mounted && isInitialized ? getText('hero_badge', "از ۱۹۸۴ در خدمت سلامت حیوانات") : "از ۱۹۸۴ در خدمت سلامت حیوانات"}
              </span>
            </div>

            <h1 suppressHydrationWarning className="text-2xl lg:text-7xl font-black text-medical-gray-900 leading-[1.2] mb-2 sm:mb-6 font-lalezar tracking-wide">
              {titleParts[0]} <br />
              {titleParts[1] && <span className="text-canina-blue ">{titleParts[1]}</span>}
            </h1>

            <div
              suppressHydrationWarning
              className="text-sm lg:text-xl text-medical-gray-600 mb-3 sm:mb-5 max-w-2xl mx-auto lg:mx-0 leading-relaxed font-vazir animate-fade-in [&_p]:text-sm [&_p]:lg:text-xl [&_p]:leading-relaxed [&_p]:my-0 [&_span]:text-inherit"
              dangerouslySetInnerHTML={{
                __html: subtitle
              }}
            />

            <div className="whitespace-nowrap flex flex-nowrap justify-center lg:justify-start gap-2 sm:gap-6">
              <button
                onClick={() => {
                  if (onShopNavigate) {
                    onShopNavigate();
                  } else {
                    router.push('/shop');
                  }
                }}
                className="bg-canina-blue text-white px-3 sm:px-10 py-2 sm:py-5 rounded-full font-bold text-lg hover:bg-canina-blue/90 hover:shadow-2xl focus-visible:ring-4 focus-visible:ring-canina-blue/30 focus-visible:outline-none transition-all gap-2 group font-vazir shadow-lg shadow-canina-blue/20 cursor-pointer"
              >

                <span suppressHydrationWarning>{mounted && isInitialized ? getText('hero_btn_products', "مشاهده محصولات") : "مشاهده محصولات"}</span>

              </button>
              <button
                onClick={() => {
                  const element = document.getElementById('canino-advisor');
                  if (element) {
                    element.scrollIntoView({ behavior: 'smooth' });
                  }
                }}
                className="flex items-center bg-white border-2 border-medical-gray-900 text-medical-gray-900 px-3 sm:px-10 py-2 sm:py-5 rounded-full font-bold text-lg hover:bg-medical-gray-50 focus-visible:ring-4 focus-visible:ring-canina-blue/30 focus-visible:outline-none transition-all font-vazir shadow-sm cursor-pointer"
              >
                <span suppressHydrationWarning>{mounted && isInitialized ? getText('hero_btn_advisor', "دستیار سلامت پت") : "دستیار سلامت پت"}</span>
                <ChevronLeft className="w-5 h-5 group-hover:-translate-x-1 transition-transform" />
              </button>
            </div>
          </div>
        </div>

        {/* Visual Element & Interactive Slider */}
        <div
          className="lg:w-[40%] relative w-full max-w-lg lg:max-w-none mx-auto"
          onMouseEnter={() => setIsPaused(true)}
          onMouseLeave={() => setIsPaused(false)}
        >
          <div className="relative aspect-square w-full max-w-md mx-auto">
            {/* Glow backdrop behind image */}
            <div className="absolute inset-0 bg-gradient-to-tr from-canina-blue/20 via-canina-gold/15 to-transparent rounded-3xl blur-2xl transform -rotate-3 scale-95 pointer-events-none" />

            <div className="relative rounded-3xl overflow-hidden shadow-2xl border-4 border-white bg-medical-gray-100 aspect-square w-full"
              onTouchStart={onTouchStart}
              onTouchMove={onTouchMove}
              onTouchEnd={onTouchEnd}
            >
              {/* Preloaded and persistent slider image stack */}
              {heroBanners.length > 0 ? (
                heroBanners.map((banner, idx) => (
                  <motion.div
                    key={banner.imageUrl || idx}
                    initial={false}
                    animate={{
                      opacity: currentSlide === idx ? 1 : 0,
                      scale: currentSlide === idx ? 1 : 1.04,
                      zIndex: currentSlide === idx ? 10 : 0,
                    }}
                    transition={{ duration: 0.6, ease: "easeInOut" }}
                    className="absolute inset-0 w-full h-full"
                  >
                    <Image
                      src={getMediaUrl(banner.imageUrl)}
                      alt={banner.title || "Canina Pharma Germany"}
                      fill
                      priority={idx === 0}
                      fetchPriority={idx === 0 ? "high" : "auto"}
                      loading={idx === 0 ? "eager" : "lazy"}
                      sizes="(max-width: 640px) 100vw, (max-width: 1024px) 50vw, 500px"
                      className="object-cover"
                    />
                  </motion.div>
                ))
              ) : activeImageUrl ? (
                <div className="absolute inset-0 w-full h-full">
                  <Image
                    src={getMediaUrl(activeImageUrl)}
                    alt={activeBanner?.title || "Canina Pharma Germany"}
                    fill
                    priority
                    fetchPriority="high"
                    loading="eager"
                    sizes="(max-width: 640px) 100vw, (max-width: 1024px) 50vw, 500px"
                    className="object-cover"
                  />
                </div>
              ) : null}

              {/* Gradient overlay and slide caption */}
              <div className="absolute bottom-0 left-0 right-0 p-6 sm:p-8 bg-gradient-to-t from-black/85 via-black/40 to-transparent text-white text-right z-20">
                <div suppressHydrationWarning className="text-sm font-medium mb-1 opacity-80 uppercase tracking-widest text-[10px]">
                  {mounted && isInitialized ? getText('hero_image_badge', "سرآمد علمی در پزشکی پت‌ها") : "سرآمد علمی در پزشکی پت‌ها"}
                </div>
                <div suppressHydrationWarning className="text-lg sm:text-xl font-bold italic tracking-tighter">
                  {activeBanner?.title || (mounted && isInitialized ? getText('hero_image_title', "مکمل‌های تایید شده دامپزشکی با گواهی IFS") : "مکمل‌های تایید شده دامپزشکی با گواهی IFS")}
                </div>
                {activeBanner?.linkUrl && (
                  <a
                    href={activeBanner.linkUrl}
                    className="inline-flex items-center gap-1 text-xs text-canina-gold hover:underline font-bold mt-2"
                  >
                    <span>اطلاعات بیشتر و خرید</span>
                    <ArrowLeft className="w-3.5 h-3.5" />
                  </a>
                )}
              </div>

              {/* Slider Navigation Arrows (shown if multiple slides exist) */}
              {totalSlides > 1 && (
                <>
                  <button
                    onClick={handlePrevSlide}
                    className="absolute right-4 top-1/2 -translate-y-1/2 w-11 h-11 rounded-full bg-black/40 hover:bg-black/70 text-white backdrop-blur-md flex items-center justify-center transition-all opacity-0 group-hover:opacity-100 z-30 cursor-pointer"
                    aria-label="اسلاید قبلی"
                  >
                    <ChevronRight className="w-5 h-5" />
                  </button>
                  <button
                    onClick={handleNextSlide}
                    className="absolute left-4 top-1/2 -translate-y-1/2 w-11 h-11 rounded-full bg-black/40 hover:bg-black/70 text-white backdrop-blur-md flex items-center justify-center transition-all opacity-0 group-hover:opacity-100 z-30 cursor-pointer"
                    aria-label="اسلاید بعدی"
                  >
                    <ChevronLeft className="w-5 h-5" />
                  </button>

                  {/* Dot Indicators with 44x44 Touch Target & Composited Animations */}
                  <div className="absolute bottom-4 left-1/2 -translate-x-1/2 flex items-center gap-1 z-30 bg-black/40 backdrop-blur-md px-3 py-1 rounded-full">
                    {heroBanners.map((_, idx) => (
                      <button
                        key={idx}
                        onClick={() => setCurrentSlide(idx)}
                        className="w-8 h-8 flex items-center justify-center cursor-pointer p-0 m-0"
                        aria-label={`رفتن به اسلاید ${idx + 1}`}
                      >
                        <span
                          className={`block rounded-full transition-opacity duration-300 ${currentSlide === idx
                              ? "w-4 h-2 bg-canina-gold opacity-100"
                              : "w-2 h-2 bg-white opacity-60 hover:opacity-100"
                            }`}
                        />
                      </button>
                    ))}
                  </div>
                </>
              )}

              {/* Quality Badge inside the image container */}
              <motion.div
                animate={{ rotate: 360 }}
                transition={{ duration: 20, repeat: Infinity, ease: "linear" }}
                className="absolute top-6 right-6 lg:top-8 lg:right-8 z-20 w-20 h-20 lg:w-24 lg:h-24 bg-white shadow-2xl rounded-full p-2 border-2 border-dashed border-canina-blue flex items-center justify-center text-center"
              >
                <div className="flex flex-col items-center">
                  <span className="text-lg lg:text-xl font-black text-canina-blue leading-none tracking-tighter">DE</span>
                  <span suppressHydrationWarning className="text-[6px] lg:text-[7px] font-bold text-medical-gray-500 uppercase tracking-widest mt-0.5 leading-tight">
                    {mounted && isInitialized ? getText('hero_quality_standard', "استاندارد کیفی آلمان") : "استاندارد کیفی آلمان"}
                  </span>
                </div>
              </motion.div>

              {/* 3D Action Badge */}
              <div className="absolute bottom-24 right-6 bg-canina-gold text-medical-gray-900 px-3.5 py-1.5 rounded-2xl text-xs font-black shadow-2xl z-20 flex items-center gap-1.5 font-vazir border border-white/20 select-none">
                <span className="text-sm">✨</span>
                <span>فرمول ۳کاره</span>
              </div>
            </div>
          </div>
        </div>
      </div>

      {/* Stats */}
      <div className="max-w-7xl mx-auto px-2 sm:px-4 relative">
        <motion.div
          initial={{ opacity: 0, y: 20 }}
          animate={{ opacity: 1, y: 0 }}
          transition={{ delay: 0.8, duration: 0.6 }}
          className="grid grid-cols-3 gap-2 sm:gap-6 py-6 sm:py-10 border-t border-medical-gray-150"
        >
          {/* Stat 1: Founded Year */}
          <div className="bg-medical-gray-50/50 border border-medical-gray-100 rounded-2xl sm:rounded-3xl p-2.5 sm:p-6 flex flex-col sm:flex-row items-center justify-center text-center sm:text-right gap-2 sm:gap-6 group hover:shadow-xl hover:shadow-canina-blue/5 transition-all">
            <div className="w-9 h-9 sm:w-14 sm:h-14 bg-white rounded-xl sm:rounded-2xl flex items-center justify-center text-canina-blue shadow-sm group-hover:bg-canina-blue group-hover:text-white transition-all duration-300 flex-shrink-0">
              <Calendar className="w-4 h-4 sm:w-7 sm:h-7" />
            </div>
            <div className="flex flex-col items-center sm:items-start text-center sm:text-right">
              <div className="text-base sm:text-3xl font-black text-canina-blue font-vazir leading-none">۱۹۸۴</div>
              <div suppressHydrationWarning className="text-[9px] sm:text-xs text-medical-gray-500 font-extrabold uppercase tracking-tight mt-1 sm:mt-2 font-vazir">
                {mounted && isInitialized ? getText('hero_stat_founded', "سال تاسیس برند") : "سال تاسیس برند"}
              </div>
            </div>
          </div>

          {/* Stat 2: Active Agencies */}
          <div className="bg-medical-gray-50/50 border border-medical-gray-100 rounded-2xl sm:rounded-3xl p-2.5 sm:p-6 flex flex-col sm:flex-row items-center justify-center text-center sm:text-right gap-2 sm:gap-6 group hover:shadow-xl hover:shadow-canina-blue/5 transition-all">
            <div className="w-9 h-9 sm:w-14 sm:h-14 bg-white rounded-xl sm:rounded-2xl flex items-center justify-center text-canina-blue shadow-sm group-hover:bg-canina-blue group-hover:text-white transition-all duration-300 flex-shrink-0">
              <Globe className="w-4 h-4 sm:w-7 sm:h-7" />
            </div>
            <div className="flex flex-col items-center sm:items-start text-center sm:text-right">
              <div className="flex items-baseline justify-center sm:justify-start">
                <StatCounter target={40} />
              </div>
              <div suppressHydrationWarning className="text-[9px] sm:text-xs text-medical-gray-500 font-extrabold uppercase tracking-tight mt-1 sm:mt-2 font-vazir">
                {mounted && isInitialized ? getText('hero_stat_agencies', "نمایندگی فعال") : "نمایندگی فعال"}
              </div>
            </div>
          </div>

          {/* Stat 3: German Formula */}
          <div className="bg-medical-gray-50/50 border border-medical-gray-100 rounded-2xl sm:rounded-3xl p-2.5 sm:p-6 flex flex-col sm:flex-row items-center justify-center text-center sm:text-right gap-2 sm:gap-6 group hover:shadow-xl hover:shadow-canina-blue/5 transition-all">
            <div className="w-9 h-9 sm:w-14 sm:h-14 bg-white rounded-xl sm:rounded-2xl flex items-center justify-center text-canina-blue shadow-sm group-hover:bg-canina-blue group-hover:text-white transition-all duration-300 flex-shrink-0">
              <ShieldCheck className="w-4 h-4 sm:w-7 sm:h-7" />
            </div>
            <div className="flex flex-col items-center sm:items-start text-center sm:text-right">
              <div className="text-base sm:text-3xl font-black text-canina-blue font-vazir leading-none">۱۰۰٪</div>
              <div suppressHydrationWarning className="text-[9px] sm:text-xs text-medical-gray-500 font-extrabold uppercase tracking-tight mt-1 sm:mt-2 font-vazir">
                {mounted && isInitialized ? getText('hero_stat_german_formula', "فرمول آلمانی") : "فرمول آلمانی"}
              </div>
            </div>
          </div>
        </motion.div>
      </div>
    </section>
  );
}