import { useEffect, useMemo, useRef, useState } from "react";
import ArtistPatternBg from "./artist-pattern-bg";

type AdFormat = "auto" | "fluid" | "rectangle" | "horizontal" | "vertical" | "autorelaxed";

interface AdSenseProps {
  slot: string;
  format?: AdFormat;
  responsive?: boolean;
  className?: string;
  style?: Record<string, string>;
  layout?: string;
  layoutKey?: string;
  onAdStatus?: (filled: boolean) => void;
}

export default function AdSense({
  slot,
  format = "auto",
  responsive = true,
  className = "",
  style,
  layout,
  layoutKey,
  onAdStatus,
}: AdSenseProps) {
  const adRef = useRef<HTMLModElement>(null);
  const pushed = useRef(false);

  useEffect(() => {
    if (pushed.current) return;
    try {
      const adsbygoogle = (window as any).adsbygoogle || [];
      adsbygoogle.push({});
      pushed.current = true;
    } catch (e) {
    }

    if (!onAdStatus) return;
    const ins = adRef.current;
    if (!ins) return;

    // Google postavi data-ad-status na "filled", "unfilled" ali "unfill-optimized".
    // Ce statusa ni, se zanesemo na dejansko visino. Odlocimo se enkrat.
    let decided = false;
    const decide = (filled: boolean) => {
      if (decided) return;
      decided = true;
      obs.disconnect();
      clearTimeout(timer);
      onAdStatus(filled);
    };
    // Visina samega <ins> ni dokaz - nekatere enote imajo rezerviran prostor.
    // Napolnjen oglas ima notri okvir (iframe) z dejansko visino.
    const hasFrame = () => {
      const f = ins.querySelector("iframe");
      return !!f && (f as HTMLIFrameElement).clientHeight > 10;
    };
    const check = () => {
      const st = ins.getAttribute("data-ad-status") || "";
      if (st === "filled") return decide(true);
      if (st.startsWith("unfill")) return decide(false);
      if (hasFrame()) return decide(true);
    };
    const obs = new MutationObserver(check);
    obs.observe(ins, { attributes: true, childList: true, subtree: true, attributeFilter: ["data-ad-status", "style"] });
    const timer = setTimeout(() => decide(hasFrame()), 6000);
    check();
    return () => { obs.disconnect(); clearTimeout(timer); };
  }, []);

  return (
    <div className={`ad-container ${className}`} data-testid={`ad-slot-${slot}`}>
      <ins
        ref={adRef}
        className="adsbygoogle"
        style={style || { display: "block" }}
        data-ad-client="ca-pub-4465464714854276"
        data-ad-slot={slot}
        data-ad-format={format}
        data-full-width-responsive={responsive ? "true" : undefined}
        {...(layout ? { "data-ad-layout": layout } : {})}
        {...(layoutKey ? { "data-ad-layout-key": layoutKey } : {})}
      />
    </div>
  );
}

let adSeedCounter = 1;

export function ArticleCardAd() {
  const seed = useMemo(() => adSeedCounter++, []);
  const [filled, setFilled] = useState<boolean | null>(null);
  if (filled === false) return null;
  return (
    <ArtistPatternBg className="rounded-md border border-card-border h-full bg-card" seed={seed}>
      <AdSense
        slot="3854634730"
        format="fluid"
        layoutKey="-6r+cy-10+8a-3"
        style={{ display: "block" }}
        onAdStatus={setFilled}
      />
    </ArtistPatternBg>
  );
}

export function TopBannerAd() {
  const [filled, setFilled] = useState<boolean | null>(null);
  if (filled === false) return null;
  const shown = filled === true;
  return (
    <div
      className={shown
        ? "rounded-md overflow-hidden bg-card border border-card-border mb-4 flex flex-col items-center"
        : "flex flex-col items-center"}
      data-testid="ad-top-banner"
    >
      {shown && (
        <div className="text-[9px] text-muted-foreground/40 text-center pt-1 uppercase tracking-widest w-full">Anzeige</div>
      )}
      <AdSense
        slot="4154017639"
        format="horizontal"
        className="w-full"
        style={{ display: "block", width: "100%", height: "90px", textAlign: "center", margin: "0 auto" }}
        responsive={false}
        onAdStatus={setFilled}
      />
    </div>
  );
}

export function InArticleAd() {
  // Prava AdSense In-article enota (fluid + data-ad-layout="in-article").
  // Kadar oglasa ni, se okvir in rezerviran prostor ne izriseta.
  const [filled, setFilled] = useState<boolean | null>(null);
  if (filled === false) return null;
  const shown = filled === true;
  return (
    <div
      className={shown ? "my-6 rounded-md overflow-hidden bg-card border border-card-border" : ""}
      style={shown ? { minHeight: "260px" } : undefined}
    >
      {shown && (
        <div className="text-[9px] text-muted-foreground/40 text-center pt-1 uppercase tracking-widest">Anzeige</div>
      )}
      <AdSense
        slot="7672178246"
        format="fluid"
        layout="in-article"
        style={{ display: "block", textAlign: "center" }}
        onAdStatus={setFilled}
      />
    </div>
  );
}

export function MultiplexAd() {
  const [filled, setFilled] = useState<boolean | null>(null);
  if (filled === false) return null;
  const shown = filled === true;
  return (
    <div className={shown ? "bg-card rounded-md border border-card-border overflow-hidden" : ""}>
      <AdSense
        slot="4593001335"
        format="autorelaxed"
        style={{ display: "block" }}
        className={shown ? "w-full min-h-[250px]" : "w-full"}
        onAdStatus={setFilled}
      />
    </div>
  );
}

export function PageSideAds({ contentHalfWidth = 640 }: { contentHalfWidth?: number }) {
  const gap = 10;
  const offset = contentHalfWidth + gap;
  return (
    <div className="relative">
      <div className="hidden 2xl:flex fixed top-0 bottom-0 w-[160px] z-10 items-center justify-center pointer-events-none" style={{ left: `calc(50% - ${offset}px - 160px)` }} data-testid="ad-left-sidebar">
        <div className="pointer-events-auto">
          <AdSense
            slot="2398082838"
            format="vertical"
            style={{ display: "block", width: "160px", height: "600px" }}
          />
        </div>
      </div>
      <div className="hidden 2xl:flex fixed top-0 bottom-0 w-[160px] z-10 items-center justify-center pointer-events-none" style={{ right: `calc(50% - ${offset}px - 160px)` }} data-testid="ad-right-sidebar">
        <div className="pointer-events-auto">
          <AdSense
            slot="2398082838"
            format="vertical"
            style={{ display: "block", width: "160px", height: "600px" }}
          />
        </div>
      </div>
    </div>
  );
}

export function SidebarAd() {
  const [visible, setVisible] = useState(false);

  return (
    <div className={`sticky top-4 ${visible ? "" : "hidden"}`}>
      <div className="bg-card rounded-md border border-card-border p-4 mt-4">
        <AdSense
          slot="2398082838"
          format="auto"
          onAdStatus={(filled) => setVisible(filled)}
        />
      </div>
    </div>
  );
}