import { useEffect } from "react";

interface GlowingBackgroundProps {
  zIndex?: number;
  height?: string;
  ringColors?: string[];
  blurStrength?: string;
  gradientFrom?: string;
  gradientVia?: string;
  gradientTo?: string;
}

const GlowingBackground: React.FC<GlowingBackgroundProps> = ({
  zIndex = -1,
  height = "100vh",
  ringColors = ["#4c1d95", "#a78bfa", "#c084fc"],
  blurStrength = "blur-3xl",
  gradientFrom = "#2e026d",
  gradientVia = "#0f0c29",
  gradientTo = "#0b011b",
}) => {
  useEffect(() => {
    const container = document.createElement("div");
    container.id = "glowing-bg";
    container.style.position = "absolute";
    container.style.top = "0";
    container.style.left = "0";
    container.style.width = "100%";
    container.style.height = height;
    container.style.zIndex = zIndex.toString();
    container.style.pointerEvents = "none";
    container.style.overflow = "hidden";

    container.innerHTML = `
      <div style="
        position: absolute;
        inset: 0;
        background: radial-gradient(circle at center, ${gradientFrom}, ${gradientVia}, ${gradientTo});
        opacity: 0.8;
        z-index: 10;
      "></div>

      <div style="
        position: absolute;
        inset: 0;
        display: flex;
        align-items: center;
        justify-content: center;
        pointer-events: none;
      ">
        <div style="
          width: 1000px;
          height: 1000px;
          border-radius: 9999px;
          border: 1px solid ${ringColors[0]}33;
          filter: blur(64px);
          animation: pulse 3s infinite;
          box-shadow: 0 0 200px ${ringColors[0]}33;
        "></div>
        <div style="
          position: absolute;
          width: 700px;
          height: 700px;
          border-radius: 9999px;
          border: 1px solid ${ringColors[1]}1A;
          filter: blur(32px);
          box-shadow: 0 0 150px ${ringColors[1]}1A;
        "></div>
        <div style="
          position: absolute;
          width: 400px;
          height: 400px;
          border-radius: 9999px;
          border: 1px solid ${ringColors[2]}1A;
          filter: blur(24px);
          box-shadow: 0 0 120px ${ringColors[2]}1A;
        "></div>
      </div>

      <style>
        @keyframes pulse {
          0% { opacity: 1; transform: scale(1); }
          50% { opacity: 0.7; transform: scale(1.05); }
          100% { opacity: 1; transform: scale(1); }
        }
      </style>
    `;

    document.body.appendChild(container);

    return () => {
      const existing = document.getElementById("glowing-bg");
      if (existing) existing.remove();
    };
  }, [zIndex, height, ringColors, blurStrength, gradientFrom, gradientVia, gradientTo]);

  return null;
};

export default GlowingBackground;