"use client";

import { useEffect, useState, useRef, useCallback } from "react";
import Image from "next/image";

/* ────── Helpers ────── */
interface MenuItem {
  name: string;
  ingredients?: string | null;
  tasteProfile?: string | null;
  grapeVariety?: string | null;
  price: any;
}

interface Category {
  id: string;
  title: string;
  externalId?: string | null;
  items: MenuItem[];
}

interface MenuData {
  restaurant_name: string;
  footer_note: string;
  categories: Category[];
}

/* ────── Stars component ────── */
interface Star {
  id: number;
  left: string;
  top: string;
  duration: string;
  delay: string;
  maxOpacity: number;
}

function HeroStars() {
  const [stars, setStars] = useState<Star[]>([]);

  useEffect(() => {
    setStars(
      Array.from({ length: 40 }, (_, i) => ({
        id: i,
        left: `${Math.random() * 100}%`,
        top: `${Math.random() * 100}%`,
        duration: `${3 + Math.random() * 4}s`,
        delay: `${Math.random() * 5}s`,
        maxOpacity: 0.3 + Math.random() * 0.5,
      }))
    );
  }, []);

  return (
    <div className="hero-stars">
      {stars.map((s) => (
        <span
          key={s.id}
          className="star"
          style={
            {
              left: s.left,
              top: s.top,
              "--duration": s.duration,
              "--max-opacity": s.maxOpacity,
              animationDelay: s.delay,
            } as React.CSSProperties
          }
        />
      ))}
    </div>
  );
}

/* ────── Price renderer ────── */
function PriceDisplay({ price }: { price: MenuItem["price"] }) {
  if (typeof price === "string") {
    return <span className="item-price">{price}</span>;
  }

  const entries: [string, string][] = [];
  if (price.single) entries.push(["Tek", price.single]);
  if (price.double) entries.push(["Dbl", price.double]);
  if (price.glass) entries.push(["Kadeh", price.glass]);
  if (price.bottle) entries.push(["Şişe", price.bottle]);

  return (
    <div className="item-price-multi">
      {entries.map(([label, val]) => (
        <div key={label} className="price-row">
          <span className="price-label">{label}</span>
          <span className="item-price">{val}</span>
        </div>
      ))}
    </div>
  );
}

/* ────── Category Icon (decorative) ────── */
function getCategoryIcon(id: string): string {
  const icons: Record<string, string> = {
    classic_cocktails: "🍸",
    lunas_cocktails: "🌙",
    shots: "🥃",
    gin: "🫒",
    whiskey: "🥂",
    rum: "🏴‍☠️",
    tequila: "🌵",
    vodka: "🧊",
    cognac: "🍷",
    red_wine: "🍷",
    white_wine: "🥂",
    roze_blush: "🌸",
    champagne_prosecco: "🍾",
    draft_beer: "🍺",
    bottle_beer: "🍻",
    coffee: "☕",
    soft_drinks: "🧃",
    snacks: "🥜",
  };
  return icons[id] || "✦";
}

export default function MenuView({ data }: { data: MenuData }) {
  const [activeCategory, setActiveCategory] = useState<string>(
    data.categories[0]?.id || ""
  );
  const [showBackToTop, setShowBackToTop] = useState(false);
  const navRef = useRef<HTMLDivElement>(null);
  const sectionRefs = useRef<Map<string, HTMLElement>>(new Map());

  useEffect(() => {
    const observer = new IntersectionObserver(
      (entries) => {
        const visible = entries
          .filter((e) => e.isIntersecting)
          .sort((a, b) => a.boundingClientRect.top - b.boundingClientRect.top);
        if (visible.length > 0) {
          const id = visible[0].target.getAttribute("data-category-id");
          if (id) setActiveCategory(id);
        }
      },
      { rootMargin: "-50% 0px -50% 0px", threshold: 0 }
    );

    sectionRefs.current.forEach((el) => observer.observe(el));
    return () => observer.disconnect();
  }, []);

  useEffect(() => {
    const onScroll = () => setShowBackToTop(window.scrollY > 600);
    window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  useEffect(() => {
    if (!navRef.current) return;
    const btn = navRef.current.querySelector(
      `[data-nav-id="${activeCategory}"]`
    );
    if (btn) {
      btn.scrollIntoView({ behavior: "smooth", block: "nearest", inline: "center" });
    }
  }, [activeCategory]);

  const scrollToCategory = useCallback((id: string) => {
    const el = sectionRefs.current.get(id);
    if (el) {
      const offset = 56;
      const y = el.getBoundingClientRect().top + window.scrollY - offset;
      window.scrollTo({ top: y, behavior: "smooth" });
    }
  }, []);

  const setSectionRef = useCallback(
    (id: string) => (el: HTMLElement | null) => {
      if (el) sectionRefs.current.set(id, el);
    },
    []
  );

  return (
    <>
      <section className="hero" id="hero">
        <HeroStars />
        <div className="hero-moon" />
        <div className="hero-brand">
          <Image
            src="/logo1.png"
            alt="Luna Cocktail and More"
            width={360}
            height={360}
            className="hero-logo"
            priority
          />
          <div className="hero-divider" />
          <p className="hero-subtitle">MENÜ</p>
        </div>

        <a
          href="#menu"
          className="hero-scroll-cta"
          onClick={(e) => {
            e.preventDefault();
            scrollToCategory(data.categories[0]?.id);
          }}
        >
          MENÜYÜ KEŞFET
          <span className="scroll-arrow" />
        </a>
      </section>

      <nav className="category-nav" id="menu">
        <div className="category-nav-inner" ref={navRef}>
          {data.categories.map((cat) => (
            <button
              key={cat.id}
              data-nav-id={cat.id}
              className={`category-nav-btn ${activeCategory === cat.id ? "active" : ""
                }`}
              onClick={() => scrollToCategory(cat.id)}
            >
              {cat.title.toLocaleUpperCase('en')}
            </button>
          ))}
        </div>
      </nav>

      <main className="menu-container">
        {data.categories.map((cat) => (
          <section
            key={cat.id}
            className="category-section"
            data-category-id={cat.id}
            ref={setSectionRef(cat.id)}
          >
            <div className="category-header">
              <h2 className="category-title">
                <span style={{ marginRight: "0.5rem", fontSize: "0.85em" }}>
                  {getCategoryIcon(cat.externalId || cat.id)}
                </span>
                {cat.title}
              </h2>
              <p className="category-item-count">
                {cat.items.length} ÜRÜN
              </p>
            </div>

            <div className="menu-items">
              {cat.items.map((item, idx) => (
                <div className="menu-item" key={`${cat.id}-${idx}`}>
                  <div className="item-info">
                    <h3 className="item-name">{item.name}</h3>
                    <div className="item-meta">
                      {item.grapeVariety && (
                        <span className="item-grape">{item.grapeVariety}</span>
                      )}
                      {item.ingredients && (
                        <span className="item-ingredients">
                          {item.ingredients}
                        </span>
                      )}
                      {item.tasteProfile && (
                        <div className="item-taste-profile">
                          {item.tasteProfile.split("-").map((t, i) => (
                            <span key={i} className="taste-tag">
                              {t.trim()}
                            </span>
                          ))}
                        </div>
                      )}
                    </div>
                  </div>
                  <div className="item-price-area">
                    <PriceDisplay price={item.price} />
                  </div>
                </div>
              ))}
            </div>
          </section>
        ))}
      </main>

      <footer className="menu-footer">
        <p className="footer-note">{data.footer_note}</p>
        <p className="footer-brand">LUNA ✦</p>
      </footer>

      <button
        className={`back-to-top ${showBackToTop ? "visible" : ""}`}
        onClick={() => window.scrollTo({ top: 0, behavior: "smooth" })}
        aria-label="Yukarı git"
      >
        <svg
          viewBox="0 0 24 24"
          fill="none"
          stroke="currentColor"
          strokeWidth={2}
        >
          <polyline points="18 15 12 9 6 15" />
        </svg>
      </button>
    </>
  );
}