"use client";

import { useLayoutEffect, useRef, useState } from "react";
import Link from "next/link";
import { gsap } from "gsap";
import { GoArrowUpRight } from "react-icons/go";
import { useTheme } from "next-themes";
import "./CardNav.css";

interface CardNavLink {
  label: string;
  href?: string;
  ariaLabel: string;
}

interface CardNavItem {
  label: string;
  bgColor: string;
  textColor: string;
  links: CardNavLink[];
}

interface CardNavProps {
  logo?: string;
  logoAlt?: string;
  items: CardNavItem[];
  className?: string;
  ease?: string;
  baseColor?: string;
  menuColor?: string;
  buttonBgColor?: string;
  buttonTextColor?: string;
}

const CardNav: React.FC<CardNavProps> = ({
  logo,
  logoAlt = "Logo",
  items,
  className = "",
  ease = "power3.out",
  baseColor = "#fff",
  menuColor,
  buttonBgColor,
  buttonTextColor,
}) => {
  const [isHamburgerOpen, setIsHamburgerOpen] = useState(false);
  const [isExpanded, setIsExpanded] = useState(false);
  const [isMobile, setIsMobile] = useState(false);
  const navRef = useRef<HTMLElement>(null);
  const cardsRef = useRef<HTMLDivElement[]>([]);
  const tlRef = useRef<gsap.core.Timeline | null>(null);
  const { theme, setTheme } = useTheme();

  const calculateHeight = () => {
    const navEl = navRef.current;
    if (!navEl) return 260;

    const isMobile = window.matchMedia("(max-width: 768px)").matches;
    if (isMobile) {
      const contentEl = navEl.querySelector<HTMLElement>(".card-nav-content");
      if (contentEl) {
        const wasVisible = contentEl.style.visibility;
        const wasPointerEvents = contentEl.style.pointerEvents;
        const wasPosition = contentEl.style.position;
        const wasHeight = contentEl.style.height;

        contentEl.style.visibility = "visible";
        contentEl.style.pointerEvents = "auto";
        contentEl.style.position = "static";
        contentEl.style.height = "auto";

        contentEl.offsetHeight;

        const topBar = 60;
        const padding = 16;
        const contentHeight = contentEl.scrollHeight;

        contentEl.style.visibility = wasVisible;
        contentEl.style.pointerEvents = wasPointerEvents;
        contentEl.style.position = wasPosition;
        contentEl.style.height = wasHeight;

        return topBar + contentHeight + padding;
      }
    }
    return 260;
  };

  const createTimeline = () => {
    const navEl = navRef.current;
    if (!navEl) return null;

    gsap.set(navEl, { height: 60 });
    gsap.set(cardsRef.current, { y: 50, opacity: 0 });

    const tl = gsap.timeline({ paused: true });

    tl.to(navEl, {
      height: calculateHeight,
      duration: 0.4,
      ease,
    });

    tl.to(
      cardsRef.current,
      { y: 0, opacity: 1, duration: 0.4, ease, stagger: 0.08 },
      "-=0.1"
    );

    return tl;
  };

  useLayoutEffect(() => {
    const tl = createTimeline();
    tlRef.current = tl;

    return () => {
      tl?.kill();
      tlRef.current = null;
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [ease, items]);

  useLayoutEffect(() => {
    const handleResize = () => {
      if (!tlRef.current) return;

      if (isExpanded) {
        const newHeight = calculateHeight();
        gsap.set(navRef.current, { height: newHeight });

        tlRef.current.kill();
        const newTl = createTimeline();
        if (newTl) {
          newTl.progress(1);
          tlRef.current = newTl;
        }
      } else {
        tlRef.current.kill();
        const newTl = createTimeline();
        if (newTl) {
          tlRef.current = newTl;
        }
      }
    };

    window.addEventListener("resize", handleResize);
    return () => window.removeEventListener("resize", handleResize);
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [isExpanded]);

  useLayoutEffect(() => {
    const mql = window.matchMedia("(max-width: 768px)");
    const update = () => setIsMobile(mql.matches);
    update();
    mql.addEventListener("change", update);
    return () => mql.removeEventListener("change", update);
  }, []);

  const toggleMenu = () => {
    const tl = tlRef.current;
    if (!tl) return;
    if (!isExpanded) {
      setIsHamburgerOpen(true);
      setIsExpanded(true);
      tl.play(0);
    } else {
      setIsHamburgerOpen(false);
      tl.eventCallback("onReverseComplete", () => setIsExpanded(false));
      tl.reverse();
    }
  };

  const setCardRef =
    (i: number) =>
    (el: HTMLDivElement | null) => {
      if (el) cardsRef.current[i] = el;
    };

  return (
    <div className={`card-nav-container ${className}`}>
      <nav
        ref={navRef}
        className={`card-nav ${isExpanded ? "open" : ""}`}
        style={{ backdropFilter: "blur(20px) saturate(1.4)", WebkitBackdropFilter: "blur(20px) saturate(1.4)" }}
      >
        <div className="card-nav-top">
          <div className="card-nav-left">
            <div
              className={`hamburger-menu ${isHamburgerOpen ? "open" : ""}`}
              onClick={toggleMenu}
              onKeyDown={(e) => {
                if (e.key === "Enter" || e.key === " ") {
                  e.preventDefault();
                  toggleMenu();
                }
              }}
              role="button"
              aria-label={isExpanded ? "Close menu" : "Open menu"}
              aria-expanded={isExpanded}
              tabIndex={0}
              style={{ color: menuColor || "#000" }}
            >
              <div className="hamburger-line" />
              <div className="hamburger-line" />
            </div>
          </div>

          <div className="logo-container">
            <Link href="/" className="no-underline">
              {logo ? (
                <img src={logo} alt={logoAlt} className="logo" />
              ) : (
                <span className="logo-text" style={{ cursor: "pointer" }}>{logoAlt}</span>
              )}
            </Link>
          </div>

          <div className="flex items-center gap-2">
            {!isMobile && (
              <button
                type="button"
                className="theme-toggle"
                onClick={() => setTheme(theme === "dark" ? "light" : "dark")}
                aria-label="Toggle dark mode"
              >
                {theme === "dark" ? (
                  <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                    <path d="M21 12.79A9 9 0 1 1 11.21 3 7 7 0 0 0 21 12.79z" />
                  </svg>
                ) : (
                  <svg width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
                    <circle cx="12" cy="12" r="4" />
                    <path d="M12 2v2" />
                    <path d="M12 20v2" />
                    <path d="m4.93 4.93 1.41 1.41" />
                    <path d="m17.66 17.66 1.41 1.41" />
                    <path d="M2 12h2" />
                    <path d="M20 12h2" />
                    <path d="m6.34 17.66-1.41 1.41" />
                    <path d="m19.07 4.93-1.41 1.41" />
                  </svg>
                )}
              </button>
            )}
          </div>
        </div>

        <div className="card-nav-content" aria-hidden={!isExpanded}>
          {(items || []).slice(0, 3).map((item, idx) => (
            <div
              key={`${item.label}-${idx}`}
              className="nav-card"
              ref={setCardRef(idx)}
              style={{ backgroundColor: item.bgColor, color: item.textColor }}
            >
              <div className="nav-card-label">{item.label}</div>
              <div className="nav-card-links">
                {item.links?.map((lnk, i) =>
                  lnk.href?.startsWith("/") ? (
                    <Link
                      key={`${lnk.label}-${i}`}
                      className="nav-card-link"
                      href={lnk.href}
                      aria-label={lnk.ariaLabel}
                    >
                      <GoArrowUpRight className="nav-card-link-icon" aria-hidden="true" />
                      {lnk.label}
                    </Link>
                  ) : (
                    <a
                      key={`${lnk.label}-${i}`}
                      className="nav-card-link"
                      href={lnk.href}
                      aria-label={lnk.ariaLabel}
                    >
                      <GoArrowUpRight className="nav-card-link-icon" aria-hidden="true" />
                      {lnk.label}
                    </a>
                  )
                )}
              </div>
            </div>
          ))}
        </div>
      </nav>
    </div>
  );
};

export default CardNav;