"use client";

import { useRef, useEffect } from "react";

interface SectionDividerProps {
  variant?: "gradient" | "pulse" | "waveform";
  className?: string;
}

export default function SectionDivider({
  variant = "gradient",
  className = "",
}: SectionDividerProps) {
  const canvasRef = useRef<HTMLCanvasElement>(null);

  useEffect(() => {
    if (variant !== "waveform") return;
    const canvas = canvasRef.current;
    if (!canvas) return;

    const ctx = canvas.getContext("2d");
    if (!ctx) return;

    let animId: number;

    const resize = () => {
      canvas.width = window.innerWidth;
      canvas.height = 60;
    };
    resize();
    window.addEventListener("resize", resize);

    const render = () => {
      animId = requestAnimationFrame(render);
      const { width, height } = canvas;
      const t = performance.now() * 0.001;

      ctx.clearRect(0, 0, width, height);

      // Draw multiple waveforms
      for (let wave = 0; wave < 3; wave++) {
        ctx.beginPath();
        ctx.strokeStyle = `rgba(204, 255, 0, ${0.1 - wave * 0.03})`;
        ctx.lineWidth = 1;

        for (let x = 0; x < width; x++) {
          const frequency = 0.005 + wave * 0.002;
          const amplitude = 8 + wave * 4;
          const speed = t * (0.5 + wave * 0.2);
          const y =
            height / 2 +
            Math.sin(x * frequency + speed) * amplitude +
            Math.sin(x * frequency * 2.3 + speed * 1.5) * (amplitude * 0.4);

          if (x === 0) ctx.moveTo(x, y);
          else ctx.lineTo(x, y);
        }

        ctx.stroke();
      }
    };

    animId = requestAnimationFrame(render);

    return () => {
      cancelAnimationFrame(animId);
      window.removeEventListener("resize", resize);
    };
  }, [variant]);

  if (variant === "gradient") {
    return (
      <div className={`relative h-px w-full overflow-hidden ${className}`}>
        <div className="absolute inset-0 bg-gradient-to-r from-transparent via-[var(--slash)] to-transparent opacity-30" />
        <div
          className="absolute inset-0 bg-gradient-to-r from-transparent via-[var(--slash)] to-transparent opacity-60"
          style={{
            animation: "shimmerDivider 3s ease-in-out infinite",
          }}
        />
      </div>
    );
  }

  if (variant === "pulse") {
    return (
      <div className={`flex items-center justify-center gap-2 py-8 ${className}`}>
        {[...Array(5)].map((_, i) => (
          <div
            key={i}
            className="h-1 w-1 rounded-full bg-[var(--slash)]"
            style={{
              animation: `pulseDot 2s ease-in-out ${i * 0.15}s infinite`,
            }}
          />
        ))}
      </div>
    );
  }

  // waveform
  return (
    <div className={`relative ${className}`}>
      <canvas
        ref={canvasRef}
        className="w-full opacity-60"
        style={{ height: 60 }}
        aria-hidden="true"
      />
    </div>
  );
}