import { useQuery } from "@tanstack/react-query";
import { Link } from "wouter";
import { type Article } from "@shared/schema";
import { format } from "date-fns";
import { de } from "date-fns/locale";
import { Eye, Play, Images } from "lucide-react";
import { Skeleton } from "@/components/ui/skeleton";
import Header from "@/components/header";
import Footer from "@/components/footer";
import AdSense from "@/components/adsense";
import { PhotoGalleryWidget } from "@/components/photo-gallery";
import { HoroscopeWidget } from "@/components/horoscope-widget";
import { RecipeWidget } from "@/components/recipe-widget";
import { NewsWidget } from "@/components/news-widget";
import { useState, useEffect, useCallback } from "react";

interface GalleryImage {
  folder: string;
  fileName: string;
  thumb: string;
  large: string;
}

function thumbUrl(src: string | null): string {
  if (!src) return "/images/article-1.png";
  if (src.endsWith(".webp")) return src.replace(".webp", "-thumb.webp");
  return src;
}

function timeAgo(date: Date): string {
  const now = new Date();
  const diffMs = now.getTime() - date.getTime();
  const diffH = Math.floor(diffMs / 3600000);
  const diffD = Math.floor(diffMs / 86400000);
  if (diffH < 1) return "Gerade eben";
  if (diffH < 24) return `vor ${diffH} Std.`;
  if (diffD < 7) return `vor ${diffD} T.`;
  return format(date, "d. MMM yyyy", { locale: de });
}

function HeroCard({ article }: { article: Article }) {
  const isVideo = article.category === "Video";
  return (
    <Link href={`/article/${article.slug}`}>
      <div className="relative group cursor-pointer rounded-lg overflow-hidden" data-testid={`card-hero-${article.id}`}>
        <div className="relative aspect-[16/9]">
          <img src={article.coverImage || "/images/article-1.png"} alt={article.title} className="w-full h-full object-cover absolute inset-0 transition-transform duration-700 group-hover:scale-105" style={{ objectPosition: "center 25%" }} loading="lazy" />
          {isVideo && (
            <div className="absolute inset-0 flex items-center justify-center z-10">
              <div className="w-14 h-14 rounded-full bg-primary/90 flex items-center justify-center group-hover:bg-primary transition-colors shadow-lg">
                <Play className="w-6 h-6 text-white ml-0.5" fill="white" />
              </div>
            </div>
          )}
          <div className="absolute inset-0 bg-gradient-to-t from-black/90 via-black/30 to-transparent" />
          <div className="absolute bottom-0 left-0 right-0 p-5">
            <div className="flex items-center gap-2 mb-2">
              <span className="text-xs font-medium text-primary bg-primary/20 px-2 py-0.5 rounded">{article.category}</span>
              <span className="text-white/60 text-xs">{timeAgo(new Date(article.publishedAt))}</span>
            </div>
            <h3 className="text-white font-bold text-lg md:text-xl leading-tight line-clamp-3">{article.title}</h3>
            <p className="text-white/50 text-sm mt-1.5 line-clamp-2 max-w-lg hidden md:block">{article.excerpt}</p>
          </div>
        </div>
      </div>
    </Link>
  );
}

function GalleryHeroCard({ images }: { images: GalleryImage[] }) {
  const [idx, setIdx] = useState(0);

  useEffect(() => {
    const timer = setInterval(() => setIdx((i) => (i + 1) % images.length), 10000);
    return () => clearInterval(timer);
  }, [images.length]);

  return (
    <Link href="/gallery">
      <div className="relative group cursor-pointer rounded-lg overflow-hidden" data-testid="card-hero-gallery">
        <div className="relative aspect-[16/9]">
          <img src={images[idx].large || images[idx].thumb} alt={images[idx].fileName} className="w-full h-full object-cover absolute inset-0 transition-opacity duration-1000" style={{ objectPosition: "center 25%" }} loading="lazy" />
          <div className="absolute inset-0 bg-gradient-to-t from-black/90 via-black/30 to-transparent" />
          <div className="absolute bottom-0 left-0 right-0 p-5">
            <div className="flex items-center gap-2 mb-2">
              <span className="text-xs font-medium text-primary bg-primary/20 px-2 py-0.5 rounded flex items-center gap-1">
                <Images className="w-3 h-3" /> Fotogalerie
              </span>
            </div>
            <h3 className="text-white font-bold text-lg md:text-xl leading-tight">Backstage & Events</h3>
            <p className="text-white/50 text-sm mt-1.5 hidden md:block">{images.length} exklusive Fotos aus der Welt der Volksmusik</p>
          </div>
        </div>
      </div>
    </Link>
  );
}

function MediumCard({ article }: { article: Article }) {
  const isVideo = article.category === "Video";
  return (
    <Link href={`/article/${article.slug}`}>
      <div className="relative group cursor-pointer rounded-lg overflow-hidden h-full bg-card border border-card-border flex flex-col" data-testid={`card-medium-${article.id}`}>
        <div className="relative flex-shrink-0">
          <div className="overflow-hidden">
            <img src={thumbUrl(article.coverImage)} alt={article.title} className="w-full aspect-video object-cover transition-transform duration-500 group-hover:scale-105" style={{ objectPosition: "center 25%" }} loading="lazy" />
          </div>
          {isVideo && (
            <div className="absolute inset-0 flex items-center justify-center">
              <div className="w-10 h-10 rounded-full bg-primary/90 flex items-center justify-center group-hover:bg-primary transition-colors">
                <Play className="w-4 h-4 text-white ml-0.5" fill="white" />
              </div>
            </div>
          )}
        </div>
        <div className="p-3.5 flex flex-col flex-1">
          <div className="flex items-center gap-2 mb-1.5">
            <span className="text-[10px] font-medium text-primary">{article.author}</span>
            <span className="text-muted-foreground text-[10px]">{timeAgo(new Date(article.publishedAt))}</span>
          </div>
          <h3 className="font-semibold text-card-foreground text-sm leading-snug line-clamp-2 group-hover:text-primary transition-colors">{article.title}</h3>
          <p className="text-xs text-muted-foreground mt-1.5 leading-relaxed flex-1">{article.excerpt}</p>
          <div className="flex items-center gap-2 mt-2 text-muted-foreground text-[10px]">
            <Eye className="w-3 h-3" />
            {article.views.toLocaleString()}
          </div>
        </div>
      </div>
    </Link>
  );
}

function SideCard({ article }: { article: Article }) {
  const isVideo = article.category === "Video";
  return (
    <Link href={`/article/${article.slug}`}>
      <div className="relative group cursor-pointer rounded-lg overflow-hidden bg-card border border-card-border h-full flex flex-col" data-testid={`card-side-${article.id}`}>
        <div className="relative flex-shrink-0">
          <div className="overflow-hidden">
            <img src={thumbUrl(article.coverImage)} alt={article.title} className="w-full aspect-[4/3] object-cover transition-transform duration-500 group-hover:scale-105" style={{ objectPosition: "center 25%" }} loading="lazy" />
          </div>
          {isVideo && (
            <div className="absolute inset-0 flex items-center justify-center">
              <div className="w-8 h-8 rounded-full bg-primary/90 flex items-center justify-center group-hover:bg-primary transition-colors">
                <Play className="w-3.5 h-3.5 text-white ml-0.5" fill="white" />
              </div>
            </div>
          )}
        </div>
        <div className="p-2.5 flex flex-col flex-1">
          <h3 className="font-semibold text-card-foreground text-xs leading-snug line-clamp-2 group-hover:text-primary transition-colors">{article.title}</h3>
        </div>
      </div>
    </Link>
  );
}

function NativeAdCard() {
  return (
    <div className="relative rounded-lg overflow-hidden h-full bg-card border border-card-border" data-testid="card-native-ad">
      <div className="relative">
        <div className="overflow-hidden aspect-video bg-muted">
          <AdSense
            slot="auto"
            format="fluid"
            layoutKey="-6t+ed+2i-1n-4w"
            style={{ display: "block" }}
            className="w-full h-full min-h-[160px]"
          />
        </div>
      </div>
    </div>
  );
}

function TopStoriesList({ articles }: { articles: Article[] }) {
  return (
    <div className="bg-card rounded-lg border border-card-border p-4 h-full" data-testid="sidebar-top-stories">
      <h3 className="font-bold text-card-foreground text-sm mb-3 flex items-center gap-2">
        <span className="w-1 h-4 bg-primary rounded-full" />
        Top-Storys
      </h3>
      <div className="space-y-3">
        {articles.slice(0, 5).map((article) => (
          <Link key={article.id} href={`/article/${article.slug}`}>
            <div className="group cursor-pointer py-1.5 border-b border-card-border last:border-0" data-testid={`card-top-${article.id}`}>
              <div className="flex items-center gap-1.5 mb-0.5">
                <span className="text-[10px] font-medium text-primary">{article.category}</span>
                <span className="text-muted-foreground text-[10px]">{timeAgo(new Date(article.publishedAt))}</span>
              </div>
              <h4 className="text-xs font-medium text-card-foreground line-clamp-2 group-hover:text-primary transition-colors leading-snug">{article.title}</h4>
            </div>
          </Link>
        ))}
      </div>
    </div>
  );
}

function FeaturedCarousel({ articles, popular, galleryImages }: { articles: Article[]; popular?: Article[]; galleryImages?: GalleryImage[] }) {
  const hasGallery = galleryImages && galleryImages.length > 0;
  const articlePages = Math.min(5, Math.max(1, articles.length));
  const total = articlePages + (hasGallery ? 1 : 0);
  const [page, setPage] = useState(0);
  const [paused, setPaused] = useState(false);

  const next = useCallback(() => {
    setPage((p) => (p + 1) % total);
  }, [total]);

  useEffect(() => {
    if (paused || total <= 1) return;
    const timer = setInterval(next, 8000);
    return () => clearInterval(timer);
  }, [paused, next, total]);

  const isGalleryPage = hasGallery && page === total - 1;
  const isWidePage = page === 1;

  let hero: Article | null = null;
  let side: Article[] = [];

  if (!isGalleryPage && articles.length > 0) {
    hero = articles[page % articles.length];
    if (!isWidePage) {
      side = [
        articles[(page * 2 + 1) % articles.length],
        articles[(page * 2 + 2) % articles.length],
      ];
    }
  }

  const wide = isGalleryPage || isWidePage;

  return (
    <section data-testid="featured-carousel" onMouseEnter={() => setPaused(true)} onMouseLeave={() => setPaused(false)}>
      <div className="grid grid-cols-1 lg:grid-cols-6 gap-4">
        <div className={wide ? "lg:col-span-5" : "lg:col-span-3"}>
          {isGalleryPage && galleryImages ? (
            <GalleryHeroCard images={galleryImages.slice(0, 30)} />
          ) : hero ? (
            <HeroCard article={hero} />
          ) : null}
        </div>
        {!wide && (
          <div className="lg:col-span-2 grid grid-cols-1 gap-3">
            {side.map((a) => (
              <MediumCard key={a.id} article={a} />
            ))}
          </div>
        )}
        <div className="lg:col-span-1">
          {popular && popular.length > 0 && <TopStoriesList articles={popular} />}
        </div>
      </div>
      {total > 1 && (
        <div className="flex justify-center gap-2 mt-3" data-testid="carousel-dots">
          {Array.from({ length: total }).map((_, i) => (
            <button key={i} onClick={() => setPage(i)} className={`w-2.5 h-2.5 rounded-full transition-all duration-300 ${i === page ? "bg-primary w-6" : "bg-muted-foreground/30 hover:bg-muted-foreground/50"}`} data-testid={`button-carousel-dot-${i}`} />
          ))}
        </div>
      )}
    </section>
  );
}

function BentoSkeleton() {
  return (
    <div className="space-y-4">
      <div className="grid grid-cols-6 gap-4">
        <div className="col-span-6 lg:col-span-3"><Skeleton className="w-full h-[380px] rounded-lg" /></div>
        <div className="col-span-6 lg:col-span-3 grid grid-cols-2 gap-4">
          <Skeleton className="w-full h-[180px] rounded-lg" />
          <Skeleton className="w-full h-[180px] rounded-lg" />
          <Skeleton className="w-full h-[180px] rounded-lg" />
          <Skeleton className="w-full h-[180px] rounded-lg" />
        </div>
      </div>
    </div>
  );
}

export default function Home() {
  const { data: articles, isLoading } = useQuery<Article[]>({
    queryKey: ["/api/articles"],
  });

  const { data: popular } = useQuery<Article[]>({
    queryKey: ["/api/articles/popular"],
  });

  const { data: galleryImages } = useQuery<GalleryImage[]>({
    queryKey: ["/api/gallery"],
  });

  if (isLoading || !articles) {
    return (
      <div className="min-h-screen bg-background">
        <Header />
        <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4"><BentoSkeleton /></main>
        <Footer />
      </div>
    );
  }

  const row2Left = articles.slice(0, 2);
  const row3Middle = articles.slice(2, 4);
  const row4Articles = articles.slice(4, 7);
  const row5Articles = articles.slice(7, 10);

  return (
    <div className="min-h-screen bg-background">
      <Header />
      <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4 space-y-4">

        <FeaturedCarousel articles={articles} popular={popular} galleryImages={galleryImages} />

        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
          {row2Left.map((a) => (
            <MediumCard key={a.id} article={a} />
          ))}
          <div className="aspect-[4/5] sm:aspect-auto">
            <PhotoGalleryWidget />
          </div>
          <div className="aspect-[4/5] sm:aspect-auto">
            <RecipeWidget />
          </div>
        </div>

        <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
          <div className="aspect-[4/5] sm:aspect-auto">
            <HoroscopeWidget />
          </div>
          {row3Middle.map((a) => (
            <MediumCard key={a.id} article={a} />
          ))}
          <div className="aspect-[4/5] sm:aspect-auto">
            <NewsWidget />
          </div>
        </div>

        {row4Articles.length > 0 && (
          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
            {row4Articles.map((a) => (
              <MediumCard key={a.id} article={a} />
            ))}
            <NativeAdCard />
          </div>
        )}

        {row5Articles.length > 0 && (
          <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
            {row5Articles.map((a) => (
              <MediumCard key={a.id} article={a} />
            ))}
            <NativeAdCard />
          </div>
        )}

      </main>
      <Footer />
    </div>
  );
}
