"use client";

import { useEffect, useRef } from "react";
import { usePathname } from "next/navigation";
import { ArrowUpRight } from "lucide-react";

const nativeTargets =
  'input, textarea, select, [contenteditable="true"], canvas, video, iframe, dialog[open], [popover], .leaflet-container, [data-native-cursor], [role="slider"], button:disabled, [aria-disabled="true"]';
const interactiveTargets =
  'a[href], button, summary, label[for], [role="button"]';

export function SiteCursor() {
  const cursorRef = useRef<HTMLDivElement>(null);
  const ringRef = useRef<HTMLDivElement>(null);
  const dotRef = useRef<HTMLDivElement>(null);
  const pathname = usePathname();

  useEffect(() => {
    const cursor = cursorRef.current;
    const ring = ringRef.current;
    const dot = dotRef.current;
    if (!cursor || !ring || !dot) return;

    const preference = matchMedia(
      "(hover: hover) and (pointer: fine) and (prefers-reduced-motion: no-preference)",
    );
    let visible = false;
    let frame = 0;
    let previousTime = 0;
    let targetX = 0;
    let targetY = 0;
    let ringX = 0;
    let ringY = 0;

    const hide = () => {
      visible = false;
      cursor.dataset.visible = "false";
      cursor.dataset.pressed = "false";
      document.documentElement.classList.remove("has-site-cursor");
      cancelAnimationFrame(frame);
      frame = 0;
    };

    const paint = (time: number) => {
      const elapsed = Math.min(time - previousTime || 16, 40);
      previousTime = time;
      const follow = 1 - Math.exp(-elapsed / 55);
      ringX += (targetX - ringX) * follow;
      ringY += (targetY - ringY) * follow;
      ring.style.transform = `translate3d(${ringX}px, ${ringY}px, 0)`;
      dot.style.transform = `translate3d(${targetX}px, ${targetY}px, 0)`;
      if (Math.hypot(targetX - ringX, targetY - ringY) > 0.1) {
        frame = requestAnimationFrame(paint);
      } else {
        frame = 0;
      }
    };

    const move = (event: PointerEvent) => {
      const element = event.target instanceof Element ? event.target : null;
      if (
        !preference.matches ||
        event.pointerType !== "mouse" ||
        document.pointerLockElement ||
        !element ||
        element.closest(nativeTargets)
      ) {
        hide();
        return;
      }

      targetX = event.clientX;
      targetY = event.clientY;
      cursor.dataset.mode = element.closest(interactiveTargets)
        ? "link"
        : "default";
      if (!visible) {
        ringX = targetX;
        ringY = targetY;
        previousTime = 0;
        ring.style.transform = `translate3d(${ringX}px, ${ringY}px, 0)`;
        dot.style.transform = `translate3d(${targetX}px, ${targetY}px, 0)`;
        visible = true;
        cursor.dataset.visible = "true";
        document.documentElement.classList.add("has-site-cursor");
      }
      if (!frame) {
        previousTime = 0;
        frame = requestAnimationFrame(paint);
      }
    };

    const leave = (event: PointerEvent) => {
      if (!event.relatedTarget) hide();
    };
    const press = () => {
      cursor.dataset.pressed = "true";
    };
    const release = () => {
      cursor.dataset.pressed = "false";
    };
    const keyboard = (event: KeyboardEvent) => {
      if (event.key === "Tab" || event.key === "Escape") hide();
    };
    const visibility = () => {
      if (document.hidden) hide();
    };

    document.addEventListener("pointermove", move, { passive: true });
    document.addEventListener("pointerover", move, { passive: true });
    document.addEventListener("pointerout", leave, { passive: true });
    document.addEventListener("pointerdown", press, { passive: true });
    document.addEventListener("pointerup", release, { passive: true });
    document.addEventListener("pointercancel", hide);
    document.addEventListener("keydown", keyboard);
    document.addEventListener("visibilitychange", visibility);
    document.addEventListener("pointerlockchange", hide);
    window.addEventListener("blur", hide);
    preference.addEventListener("change", hide);

    return () => {
      hide();
      document.removeEventListener("pointermove", move);
      document.removeEventListener("pointerover", move);
      document.removeEventListener("pointerout", leave);
      document.removeEventListener("pointerdown", press);
      document.removeEventListener("pointerup", release);
      document.removeEventListener("pointercancel", hide);
      document.removeEventListener("keydown", keyboard);
      document.removeEventListener("visibilitychange", visibility);
      document.removeEventListener("pointerlockchange", hide);
      window.removeEventListener("blur", hide);
      preference.removeEventListener("change", hide);
    };
  }, [pathname]);

  return (
    <div className="site-cursor" ref={cursorRef} aria-hidden="true">
      <div className="site-cursor-ring" ref={ringRef}>
        <div className="site-cursor-orbit">
          <ArrowUpRight size={20} strokeWidth={1.5} />
        </div>
      </div>
      <div className="site-cursor-dot" ref={dotRef}>
        <span />
      </div>
    </div>
  );
}