"use client";

import { useEffect, useRef, useState, useCallback } from "react";
import { motion, useMotionValue, useSpring } from "framer-motion";

export default function CustomCursor() {
  const [isHovering, setIsHovering] = useState(false);
  const [isClicking, setIsClicking] = useState(false);
  const [hoverText, setHoverText] = useState("");
  const [isVisible, setIsVisible] = useState(false);
  const cursorX = useMotionValue(0);
  const cursorY = useMotionValue(0);
  const springConfig = { damping: 25, stiffness: 250, mass: 0.5 };
  const x = useSpring(cursorX, springConfig);
  const y = useSpring(cursorY, springConfig);

  const ringSpringConfig = { damping: 20, stiffness: 150, mass: 0.8 };
  const ringX = useSpring(cursorX, ringSpringConfig);
  const ringY = useSpring(cursorY, ringSpringConfig);

  const rafRef = useRef<number>(0);

  const handleMouseMove = useCallback(
    (e: MouseEvent) => {
      if (rafRef.current) cancelAnimationFrame(rafRef.current);
      rafRef.current = requestAnimationFrame(() => {
        cursorX.set(e.clientX);
        cursorY.set(e.clientY);
        if (!isVisible) setIsVisible(true);
      });
    },
    [cursorX, cursorY, isVisible]
  );

  useEffect(() => {
    // Only show custom cursor on desktop with fine pointer
    const hasFinePointer = window.matchMedia("(pointer: fine)").matches;
    if (!hasFinePointer) return;

    const handleDown = () => setIsClicking(true);
    const handleUp = () => setIsClicking(false);
    const handleLeave = () => setIsVisible(false);
    const handleEnter = () => setIsVisible(true);

    window.addEventListener("mousemove", handleMouseMove);
    window.addEventListener("mousedown", handleDown);
    window.addEventListener("mouseup", handleUp);
    document.addEventListener("mouseleave", handleLeave);
    document.addEventListener("mouseenter", handleEnter);

    // Detect hoverable elements
    const observer = new MutationObserver(() => {
      attachHoverListeners();
    });
    observer.observe(document.body, { childList: true, subtree: true });
    attachHoverListeners();

    function attachHoverListeners() {
      const hoverables = document.querySelectorAll(
        'a, button, [role="button"], input, textarea, select, [data-cursor]'
      );
      for (const el of hoverables) {
        el.addEventListener("mouseenter", handleElementEnter as EventListener);
        el.addEventListener("mouseleave", handleElementLeave as EventListener);
      }
    }

    function handleElementEnter(e: Event) {
      const el = e.currentTarget as HTMLElement;
      setIsHovering(true);
      const cursorData = el.getAttribute("data-cursor");
      if (cursorData) setHoverText(cursorData);
    }

    function handleElementLeave() {
      setIsHovering(false);
      setHoverText("");
    }

    return () => {
      window.removeEventListener("mousemove", handleMouseMove);
      window.removeEventListener("mousedown", handleDown);
      window.removeEventListener("mouseup", handleUp);
      document.removeEventListener("mouseleave", handleLeave);
      document.removeEventListener("mouseenter", handleEnter);
      observer.disconnect();
      if (rafRef.current) cancelAnimationFrame(rafRef.current);
    };
  }, [handleMouseMove]);

  // Don't render on touch devices
  if (typeof window !== "undefined" && !window.matchMedia("(pointer: fine)").matches) {
    return null;
  }

  return (
    <>
      <style jsx global>{`
        @media (pointer: fine) {
          * { cursor: none !important; }
        }
      `}</style>

      {/* Dot cursor */}
      <motion.div
        className="pointer-events-none fixed top-0 left-0 z-[9999] mix-blend-difference"
        style={{
          x,
          y,
          translateX: "-50%",
          translateY: "-50%",
        }}
        animate={{
          scale: isClicking ? 0.5 : isHovering ? 0.5 : 1,
          opacity: isVisible ? 1 : 0,
        }}
        transition={{ duration: 0.15 }}
      >
        <div
          className="rounded-full bg-[#ccff00]"
          style={{ width: 8, height: 8 }}
        />
      </motion.div>

      {/* Ring cursor */}
      <motion.div
        className="pointer-events-none fixed top-0 left-0 z-[9998] mix-blend-difference"
        style={{
          x: ringX,
          y: ringY,
          translateX: "-50%",
          translateY: "-50%",
        }}
        animate={{
          width: isHovering ? 80 : 40,
          height: isHovering ? 80 : 40,
          opacity: isVisible ? (isHovering ? 0.8 : 0.4) : 0,
          borderWidth: isHovering ? 2 : 1,
        }}
        transition={{ duration: 0.3, ease: [0.16, 1, 0.3, 1] }}
      >
        <div
          className="flex h-full w-full items-center justify-center rounded-full border-[#ccff00]"
          style={{ borderStyle: "solid", borderColor: "#ccff00", borderWidth: "inherit" }}
        >
          {hoverText && (
            <motion.span
              initial={{ opacity: 0, scale: 0.5 }}
              animate={{ opacity: 1, scale: 1 }}
              className="text-[9px] font-bold uppercase tracking-widest text-[#ccff00]"
            >
              {hoverText}
            </motion.span>
          )}
        </div>
      </motion.div>
    </>
  );
}