"use client";
import { useEffect, useRef } from "react";

export default function InteractiveBackground() {
  const canvasRef = useRef(null);

  useEffect(() => {
    const canvas = canvasRef.current;
    if (!canvas) return;
    const ctx = canvas.getContext("2d");

    let animationFrameId;
    let width = (canvas.width = window.innerWidth);
    let height = (canvas.height = window.innerHeight);

    // تتبع حركة الماوس
    const mouse = { x: null, y: null, radius: 180 };

    const handleMouseMove = (e) => {
      mouse.x = e.clientX;
      mouse.y = e.clientY;
    };

    const handleMouseLeave = () => {
      mouse.x = null;
      mouse.y = null;
    };

    const handleResize = () => {
      width = canvas.width = window.innerWidth;
      height = canvas.height = window.innerHeight;
    };

    window.addEventListener("mousemove", handleMouseMove);
    window.addEventListener("mouseleave", handleMouseLeave);
    window.addEventListener("resize", handleResize);

    const particles = Array.from({ length: 70 }, () => ({
      x: Math.random() * width,
      y: Math.random() * height,
      vx: (Math.random() - 0.5) * 0.8,
      vy: (Math.random() - 0.5) * 0.8,
      radius: Math.random() * 2 + 1,
    }));

    const draw = () => {
      ctx.clearRect(0, 0, width, height);

      particles.forEach((p, i) => {
        p.x += p.vx;
        p.y += p.vy;

        if (p.x < 0 || p.x > width) p.vx *= -1;
        if (p.y < 0 || p.y > height) p.vy *= -1;

       
        if (mouse.x !== null && mouse.y !== null) {
          const dx = mouse.x - p.x;
          const dy = mouse.y - p.y;
          const dist = Math.hypot(dx, dy);

          if (dist < mouse.radius) {
            const angle = Math.atan2(dy, dx);
            const force = (mouse.radius - dist) / mouse.radius;
            p.x -= Math.cos(angle) * force * 2;
            p.y -= Math.sin(angle) * force * 2;
          }
        }

       
        ctx.beginPath();
        ctx.arc(p.x, p.y, p.radius, 0, Math.PI * 2);
        ctx.fillStyle = "rgba(99, 102, 241, 0.7)";
        ctx.fill();

      
        for (let j = i + 1; j < particles.length; j++) {
          const p2 = particles[j];
          const dist = Math.hypot(p.x - p2.x, p.y - p2.y);
          if (dist < 140) {
            const opacity = 1 - dist / 140;
            ctx.beginPath();
            ctx.moveTo(p.x, p.y);
            ctx.lineTo(p2.x, p2.y);
            ctx.strokeStyle = `rgba(99, 102, 241, ${opacity * 0.25})`;
            ctx.lineWidth = 1;
            ctx.stroke();
          }
        }
      });

      animationFrameId = requestAnimationFrame(draw);
    };

    draw();

    return () => {
      window.removeEventListener("mousemove", handleMouseMove);
      window.removeEventListener("mouseleave", handleMouseLeave);
      window.removeEventListener("resize", handleResize);
      cancelAnimationFrame(animationFrameId);
    };
  }, []);

  return (
    <div className="fixed inset-0 pointer-events-none z-0 bg-slate-950 overflow-hidden">
      <div className="absolute top-1/4 -left-20 w-96 h-96 bg-indigo-600/20 rounded-full blur-3xl animate-pulse" />
      <div className="absolute bottom-1/4 -right-20 w-96 h-96 bg-blue-600/20 rounded-full blur-3xl animate-pulse delay-1000" />
      <div className="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 w-[500px] h-[500px] bg-purple-600/10 rounded-full blur-3xl" />
      <canvas ref={canvasRef} className="absolute inset-0 w-full h-full" />
    </div>
  );
}