const TARGET_URL = "http://localhost:8080/endpoint";
let lastSentSignature = "";

function extractAndSendSong() {
  const trackInfo = document.querySelector('[data-testid="now-playing-widget"]');
  
  if (trackInfo) {
    const links = trackInfo.querySelectorAll('a');
    const songTitle = links[0] ? links[0].innerText : null;
    const artistName = links[1] ? links[1].innerText : "Unknown Artist";
    
    // Získání obrázku alba
    const imgElement = trackInfo.querySelector('img');
    const albumCoverUrl = imgElement ? imgElement.src : null;

    // Získání času
    const currentTimeEl = document.querySelector('[data-testid="playback-position"]');
    const durationEl = document.querySelector('[data-testid="playback-duration"]');
    
    const currentTime = currentTimeEl ? currentTimeEl.innerText : "0:00";
    const duration = durationEl ? durationEl.innerText : "0:00";
    
    const progressFull = `${currentTime}/${duration}`;

    // Spolehlivější detekce reklamy:
    // Reklamy na Spotify trvají vždy přesně 30 vteřin (0:30) nebo nemají běžné odkazy na skladbu
    const isAd = (duration === "0:30") || (links.length < 2) || (songTitle === null);

    const finalTitle = isAd ? "Reklama" : songTitle;
    const finalArtist = isAd ? "Spotify" : artistName;

    if (finalTitle || isAd) {
      const currentSignature = `${finalArtist}-${finalTitle}-${currentTime}-${isAd}`;

      if (currentSignature !== lastSentSignature) {
        lastSentSignature = currentSignature;
        
        console.log("Odesílám data:", finalArtist, "-", finalTitle, `[${progressFull}]`, "Reklama:", isAd);

        fetch(TARGET_URL, {
          method: "POST",
          headers: {
            "Content-Type": "application/json"
          },
          body: JSON.stringify({
            artist: finalArtist,
            title: finalTitle,
            coverImg: albumCoverUrl,
            progressTime: progressFull,
            ad: isAd ? "true" : "false",
            timestamp: new Date().toISOString()
          })
        }).catch(err => {
          console.error("Chyba při odesílání:", err);
        });
      }
    }
  }
}

// Kontrola každou vteřinu
setInterval(extractAndSendSong, 1000);