"use client";
import React, { useState, useRef, useEffect } from "react";
import { Search, ChevronDown, Menu, X, Pill, ShieldCheck, HeartPulse, Sparkles, ShoppingBag, User, PlusCircle, Check, Building2, LogIn, Wallet, LogOut, MapPin, FileHeart, Dog, Cat } from "lucide-react";
import { motion, AnimatePresence } from "motion/react";
import Link from "next/link";
import { useCartStore } from "../lib/store/cartStore";
import { usePetStore } from "../lib/store/usePetStore";
import { useUserStore } from "../lib/store/userStore";
import { useSettingsStore } from "../lib/store/settingsStore";
import { toast } from "sonner";
import HeaderButton from "./HeaderButton";
import AuthModal from "./AuthModal";
import { cn } from "../lib/utils";
import { productService } from "../lib/services/productService";

const MENU_ICONS: Record<string, React.ReactNode> = {
  joints: <Pill className="w-5 h-5" />,
  immune: <ShieldCheck className="w-5 h-5" />,
  energy: <HeartPulse className="w-5 h-5" />,
  "special-care": <Sparkles className="w-5 h-5" />,
};

export default function Header({
  onNavigate,
  onShopNavigate,
  currentView,
  onCartOpen,
  onSearch,
  onB2BOpen
}: {
  onNavigate: (v: any) => void,
  onShopNavigate: (c?: string, s?: string) => void,
  currentView: string,
  onCartOpen: () => void,
  onSearch: (q: string) => void,
  onB2BOpen: () => void
}) {
  const [isMegaMenuOpen, setIsMegaMenuOpen] = useState(false);
  const [isSearchFocused, setIsSearchFocused] = useState(false);
  const [isAuthModalOpen, setIsAuthModalOpen] = useState(false);
  const [isPetSwitcherOpen, setIsPetSwitcherOpen] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
  const [isMobileSolutionsOpen, setIsMobileSolutionsOpen] = useState(false);
  const [menuItems, setMenuItems] = useState<{
    id: string;
    title: string;
    icon: React.ReactNode;
    solutions: string[];
  }[]>([]);

  const petMenuRef = useRef<HTMLDivElement>(null);

  const { getTotalItems } = useCartStore();
  const { pets, activePetId, setActivePet, getActivePet } = usePetStore();
  const { role, isLoggedIn, logout, profile } = useUserStore();
  const activePet = getActivePet();
  const getText = useSettingsStore(state => state.getText);

  useEffect(() => {
    const loadNavFilters = async () => {
      try {
        const data = await productService.getNavigationFilters();
        const mapped = data.map(item => ({
          id: item.slug,
          title: item.name,
          icon: MENU_ICONS[item.slug] || <Pill className="w-5 h-5" />,
          solutions: item.symptoms
        }));
        setMenuItems(mapped);
      } catch (e) {
        console.error("Failed to load navigation filters:", e);
      }
    };
    loadNavFilters();
  }, []);

  // Click Outside logic
  useEffect(() => {
    function handleClickOutside(event: MouseEvent) {
      if (petMenuRef.current && !petMenuRef.current.contains(event.target as Node)) {
        setIsPetSwitcherOpen(false);
      }
    }
    document.addEventListener("mousedown", handleClickOutside);
    return () => document.removeEventListener("mousedown", handleClickOutside);
  }, []);

  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault();
    if (searchQuery.trim()) {
      onSearch(searchQuery);
      setIsSearchFocused(false);
    }
  };

  return (
    <>
      <AuthModal isOpen={isAuthModalOpen} onClose={() => setIsAuthModalOpen(false)} />

      <div className="bg-canina-gold text-canina-dark text-xs font-black py-2.5 text-center font-vazir tracking-wider flex items-center justify-center gap-2">
        <span>🚚</span>
        <span>{getText('shipping_notice', "ارسال رایگان برای سفارش‌های بالای ۱۵۰ هزار تومان")}</span>
      </div>

      <header className="sticky top-0 z-50 bg-white/95 backdrop-blur-md border-b border-medical-gray-100 shadow-sm">
        <div className="max-w-7xl mx-auto h-24 flex items-center justify-between gap-4 px-4 sm:px-6 lg:px-8" dir="rtl">
          <div className="flex items-center gap-2">
            {/* Mobile Menu Toggle */}
            <button
              onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
              className="lg:hidden p-2 rounded-xl text-medical-gray-600 hover:bg-medical-gray-50 transition-all"
              aria-label="منو"
            >
              {isMobileMenuOpen ? <X className="w-6 h-6" /> : <Menu className="w-6 h-6" />}
            </button>

            {/* Logo Section */}
            <Link
              href="/"
              className="flex-shrink-0 flex items-center gap-3 cursor-pointer group"
              onClick={() => setIsMobileMenuOpen(false)}
            >
              <div className="w-12 h-12 bg-canina-blue rounded-2xl flex items-center justify-center text-white font-bold text-2xl group-hover:bg-medical-gray-900 transition-all shadow-xl shadow-canina-blue/20 italic">C</div>
              <div className="flex flex-col justify-center gap-1">
                <span className="text-canina-blue font-black text-2xl tracking-tighter italic font-sans flex items-center gap-2 leading-none">
                  Canina 
                  <span className="text-sm not-italic font-medium border-r-2 border-medical-gray-200 pr-2 font-vazir">
                    {getText('brand_name_fa', "ایران")}
                  </span>
                </span>
                <span className="text-[9px] text-medical-gray-400 font-bold uppercase tracking-wider font-vazir leading-none">
                  {getText('brand_subtitle', "نماینده رسمی Canina Pharma GmbH آلمان")}
                </span>
              </div>
            </Link>
          </div>

          {/* Navigation Items */}
          <nav className="hidden lg:flex items-center gap-1 flex-grow justify-center h-full">
            <div
              className="relative h-full flex items-center group"
              onMouseEnter={() => setIsMegaMenuOpen(true)}
              onMouseLeave={() => setIsMegaMenuOpen(false)}
            >
              <button className={`flex items-center justify-center gap-1.5 px-4 py-3 rounded-xl text-sm font-black transition-all whitespace-nowrap focus-visible:ring-4 focus-visible:ring-canina-blue/30 focus-visible:outline-none min-h-[48px] ${isMegaMenuOpen ? 'bg-medical-gray-50 text-canina-blue' : 'text-medical-gray-600 hover:bg-medical-gray-50 hover:text-canina-blue'} font-vazir`}>
                {getText('nav_solutions', "دسته بندی درمانی")}
                <ChevronDown className={`w-4 h-4 transition-transform duration-300 ${isMegaMenuOpen ? 'rotate-180' : ''}`} />
              </button>

              <AnimatePresence>
                {isMegaMenuOpen && (
                  <motion.div
                    initial={{ opacity: 0, y: 15, scale: 0.98 }}
                    animate={{ opacity: 1, y: 0, scale: 1 }}
                    exit={{ opacity: 0, y: 15, scale: 0.98 }}
                    className="absolute top-[80%] right-0 w-[680px] bg-white border border-medical-gray-100 shadow-2xl rounded-[2.5rem] p-8 grid grid-cols-2 gap-8 z-50 pointer-events-auto"
                  >
                    {menuItems.map((item, idx) => (
                      <div key={idx} className="group/item">
                        <Link
                          href={`/shop?category=${item.id}`}
                          onClick={() => setIsMegaMenuOpen(false)}
                          className="flex items-center gap-3 mb-4 cursor-pointer block"
                        >
                          <div className="p-2.5 bg-medical-gray-50 rounded-xl text-canina-blue group-hover/item:bg-canina-blue group-hover/item:text-white transition-all shadow-sm">
                            {item.icon}
                          </div>
                          <h4 className="font-black text-medical-gray-900 text-sm font-vazir">{item.title}</h4>
                        </Link>
                        {item.solutions.length > 0 ? (
                          <div className="flex flex-wrap gap-1.5 border-r-2 border-medical-gray-100 pr-3">
                            {item.solutions.slice(0, 8).map((sol, sIdx) => (
                              <Link
                                key={sIdx}
                                href={`/shop?category=${item.id}&symptom=${encodeURIComponent(sol)}`}
                                className="inline-flex items-center px-2.5 py-1 rounded-full text-[10px] font-bold bg-medical-gray-50 border border-medical-gray-200 text-medical-gray-500 hover:bg-canina-blue/5 hover:border-canina-blue/30 hover:text-canina-blue transition-all cursor-pointer font-vazir whitespace-nowrap"
                                onClick={() => setIsMegaMenuOpen(false)}
                              >
                                {sol}
                              </Link>
                            ))}
                            {item.solutions.length > 8 && (
                              <Link
                                href={`/shop?category=${item.id}`}
                                className="inline-flex items-center px-2.5 py-1 rounded-full text-[10px] font-bold text-canina-blue hover:underline font-vazir whitespace-nowrap"
                                onClick={() => setIsMegaMenuOpen(false)}
                              >
                                +{item.solutions.length - 8} بیشتر
                              </Link>
                            )}
                          </div>
                        ) : (
                          <p className="text-[11px] text-medical-gray-400 border-r-2 border-medical-gray-100 pr-3 font-vazir">مشاهده همه محصولات</p>
                        )}
                      </div>
                    ))}
                  </motion.div>
                )}
              </AnimatePresence>
            </div>

            {[
              { id: 'shop', label: getText('nav_products', 'محصولات تخصصی'), href: '/shop' },
              { id: 'wiki', label: getText('nav_wiki', 'دانشنامه علمی'), href: '/wiki' },
              { id: 'blog', label: getText('nav_blog', 'مجله سلامت پت'), href: '/blog' },
              { id: 'profile', label: getText('nav_pet_profiles', 'شناسنامه پت'), href: '/profile' }
            ].map((item) => (
              <Link
                key={item.id}
                href={item.href}
                className={`px-4 py-3 rounded-xl text-sm font-black transition-all font-vazir whitespace-nowrap focus-visible:ring-4 focus-visible:ring-canina-blue/30 focus-visible:outline-none min-h-[48px] flex items-center justify-center ${currentView === item.id ? 'bg-canina-blue/5 text-canina-blue' : 'text-medical-gray-600 hover:bg-medical-gray-50 hover:text-canina-blue'}`}
              >
                {item.label}
              </Link>
            ))}
          </nav>

          {/* Action Area */}
          <div className="flex items-center gap-4 flex-shrink-0 justify-end h-16 pl-2">

            {/* Elastic Search */}
            <div className="relative flex items-center justify-end z-20">
              <AnimatePresence>
                {isSearchFocused && (
                  <motion.div
                    initial={{ width: 0, opacity: 0 }}
                    animate={{ width: 320, opacity: 1 }}
                    exit={{ width: 0, opacity: 0 }}
                    transition={{ type: "spring", damping: 25, stiffness: 220 }}
                    className="absolute right-0 top-1/2 -translate-y-1/2 bg-white border border-canina-blue/30 border-l rounded-2xl shadow-xl shadow-canina-blue/5 overflow-hidden h-12 flex items-center pr-12 pl-4 z-25"
                  >
                    <form onSubmit={handleSearch} className="w-full flex items-center">
                      <input
                        autoFocus
                        type="text"
                        value={searchQuery}
                        onChange={e => setSearchQuery(e.target.value)}
                        onBlur={() => !searchQuery && setIsSearchFocused(false)}
                        placeholder="جستجوی محصولات، مقالات سلامت و غیره…"
                        dir="rtl"
                        className="w-full bg-transparent py-2 pr-4 text-[12px] font-black outline-none font-vazir text-medical-gray-900 text-right placeholder:text-medical-gray-400 placeholder:text-right"
                      />
                      <input type="submit" className="hidden" />
                    </form>
                  </motion.div>
                )}
              </AnimatePresence>

              <HeaderButton
                variant={isSearchFocused ? "primary" : "secondary"}
                className={cn(
                  "w-12 h-12 transition-all duration-300", 
                  isSearchFocused 
                    ? "z-30 bg-canina-blue text-white rounded-r-2xl rounded-l-none border border-canina-blue border-l-0 shadow-none" 
                    : "rounded-2xl"
                )}
                onClick={() => {
                  if (isSearchFocused && searchQuery.trim()) {
                    onSearch(searchQuery);
                    setIsSearchFocused(false);
                  } else {
                    setIsSearchFocused(!isSearchFocused);
                  }
                }}
              >
                <Search className={cn("w-5 h-5", isSearchFocused ? "text-white" : "text-canina-blue")} />
              </HeaderButton>
            </div>

            <div className="flex gap-2 items-center h-12">
              {isLoggedIn ? (
                <div className="flex items-center h-full gap-2 p-1.5 bg-medical-gray-50/50 border border-medical-gray-100 rounded-3xl">
                  {/* User Name (Direct link to dashboard) */}
                  <div
                    className="flex items-center gap-2.5 px-4 py-2 hover:bg-white rounded-2xl cursor-pointer transition-all border border-transparent hover:border-medical-gray-200"
                    onClick={() => onNavigate("user-dashboard")}
                  >
                    <User className="w-5 h-5 text-canina-blue" />
                    <span className="text-[14px] font-black font-vazir text-medical-gray-900 leading-none">
                      {profile.firstName}
                    </span>
                  </div>

                  {/* Separator Line */}
                  <div className="w-[1.5px] h-5 bg-medical-gray-200" />

                  {/* Pet Name & Switcher */}
                  <div className="relative h-full flex items-center" ref={petMenuRef}>
                    <div
                      className={cn(
                        "flex items-center gap-2.5 px-4 py-2 rounded-2xl transition-all cursor-pointer",
                        isPetSwitcherOpen ? "bg-canina-blue text-white shadow-lg shadow-canina-blue/20" : "text-canina-blue hover:bg-white"
                      )}
                      onClick={() => setIsPetSwitcherOpen(!isPetSwitcherOpen)}
                    >
                      {activePet?.type === "گربه" ? (
                        <Cat className={cn("w-5 h-5", isPetSwitcherOpen ? "text-white" : "text-canina-blue/60")} />
                      ) : (
                        <Dog className={cn("w-5 h-5", isPetSwitcherOpen ? "text-white" : "text-canina-blue/60")} />
                      )}
                      <span className={cn("text-[14px] font-black font-vazir leading-none", isPetSwitcherOpen ? "text-white" : "text-canina-blue")}>
                        {activePet?.name || "بدون پت"}
                      </span>
                      <ChevronDown className={cn("w-4 h-4 transition-transform", isPetSwitcherOpen ? "rotate-180" : "")} />
                    </div>

                    <AnimatePresence>
                      {isPetSwitcherOpen && (
                        <motion.div
                          initial={{ opacity: 0, y: 10, scale: 0.95 }}
                          animate={{ opacity: 1, y: 0, scale: 1 }}
                          exit={{ opacity: 0, y: 10, scale: 0.95 }}
                          className="absolute top-[125%] left-0 w-72 bg-white border border-medical-gray-100 shadow-2xl rounded-[1.5rem] p-5 z-50 pointer-events-auto"
                        >
                          <div className="text-[9px] font-black text-medical-gray-400 uppercase tracking-[0.2em] mb-4 pr-1">{getText('nav_pet_switcher_title', "تغییر پت یا مدیریت حساب")}</div>
                          <div className="space-y-1 mb-4">
                            {pets.map(pet => (
                              <div
                                key={pet.id}
                                className={cn(
                                  "w-full flex items-center justify-between p-3 rounded-xl transition-all group/item",
                                  activePetId === pet.id ? "bg-canina-blue/5 text-canina-blue" : "hover:bg-medical-gray-50 text-medical-gray-600"
                                )}
                              >
                                <div
                                  className="flex items-center gap-3 flex-1 cursor-pointer"
                                  onClick={() => {
                                    setActivePet(pet.id);
                                    setIsPetSwitcherOpen(false);
                                    toast.success(`پت فعال به ${pet.name} تغییر یافت`);
                                  }}
                                >
                                  <div className={cn(
                                    "w-8 h-8 rounded-lg flex items-center justify-center text-[11px] font-black transition-colors",
                                    activePetId === pet.id ? "bg-canina-blue text-white" : "bg-medical-gray-100 text-medical-gray-400 group-hover/item:bg-medical-gray-200"
                                  )}>
                                    {pet.name[0]}
                                  </div>
                                  <span className="text-[13px] font-bold font-vazir">{pet.name}</span>
                                </div>

                                <div className="flex items-center gap-1">
                                  {activePetId === pet.id && <Check className="w-4 h-4 ml-2" />}
                                  <button
                                    onClick={(e) => {
                                      e.stopPropagation();
                                      setActivePet(pet.id);
                                      onNavigate({ view: "profile", subview: "detail" });
                                      setIsPetSwitcherOpen(false);
                                    }}
                                    className="p-1.5 rounded-lg hover:bg-canina-blue hover:text-white transition-all text-medical-gray-300 hover:shadow-lg"
                                    title="مشاهده شناسنامه سلامت"
                                  >
                                    <FileHeart className="w-4 h-4" />
                                  </button>
                                </div>
                              </div>
                            ))}
                          </div>

                          <div className="pt-4 border-t border-medical-gray-100 space-y-1">
                            <button
                              onClick={() => { onNavigate({ view: "profile", subview: "add" }); setIsPetSwitcherOpen(false); }}
                              className="w-full flex items-center gap-3 p-3 text-canina-blue hover:bg-canina-blue/5 rounded-xl transition-all text-[12px] font-black font-vazir"
                            >
                              <PlusCircle className="w-5 h-5" />
                              {getText('nav_register_pet', "ثبت همدم (Pet) جدید")}
                            </button>
                            <button
                              onClick={() => { onNavigate({ view: "user-dashboard" }); setIsPetSwitcherOpen(false); }}
                              className="w-full flex items-center gap-3 p-3 text-medical-gray-600 hover:bg-medical-gray-50 rounded-xl transition-all text-[12px] font-bold font-vazir"
                            >
                              <Wallet className="w-5 h-5" />
                              {getText('nav_wallet_orders', "کیف پول و سفارشات")}
                            </button>
                            <button
                              onClick={() => { logout(); setIsPetSwitcherOpen(false); }}
                              className="w-full flex items-center gap-3 p-3 text-red-500 hover:bg-red-50 rounded-xl transition-all text-[12px] font-bold font-vazir mt-1"
                            >
                              <LogOut className="w-5 h-5" />
                              {getText('nav_logout', "خروج از حساب کانینا")}
                            </button>
                          </div>
                        </motion.div>
                      )}
                    </AnimatePresence>
                  </div>
                </div>
              ) : (
                <HeaderButton
                  variant="outline"
                  layout="row"
                  className="px-6 h-12 text-sm font-black flex items-center justify-center"
                  onClick={() => setIsAuthModalOpen(true)}
                  icon={<LogIn className="w-5 h-5 text-canina-blue" />}
                >
                  {getText('nav_login', "ورود / ثبت‌نام")}
                </HeaderButton>
              )}

              <HeaderButton
                variant="primary"
                className="w-16 h-12"
                onClick={onCartOpen}
                badge={getTotalItems()}
                icon={<ShoppingBag className="w-6 h-6" />}
              >
                <div className="text-[8px] font-black tracking-tight whitespace-nowrap mt-0.5">{getText('nav_cart', "سبد خرید")}</div>
              </HeaderButton>
            </div>
          </div>
        </div>
      </header>

      {/* Mobile Drawer Menu */}
      <AnimatePresence>
        {isMobileMenuOpen && (
          <>
            {/* Backdrop */}
            <motion.div
              initial={{ opacity: 0 }}
              animate={{ opacity: 0.5 }}
              exit={{ opacity: 0 }}
              onClick={() => setIsMobileMenuOpen(false)}
              className="fixed inset-0 bg-black z-40 lg:hidden"
            />
            {/* Drawer */}
            <motion.div
              initial={{ x: "100%" }}
              animate={{ x: 0 }}
              exit={{ x: "100%" }}
              transition={{ type: "spring", damping: 25, stiffness: 200 }}
              className="fixed top-0 right-0 bottom-0 w-80 max-w-[85vw] bg-white z-50 shadow-2xl p-6 flex flex-col gap-6 overflow-y-auto lg:hidden"
              dir="rtl"
            >
              <div className="flex items-center justify-between border-b border-medical-gray-100 pb-4">
                <Link href="/" className="flex items-center gap-3" onClick={() => setIsMobileMenuOpen(false)}>
                  <div className="w-10 h-10 bg-canina-blue rounded-xl flex items-center justify-center text-white font-bold text-xl italic">C</div>
                  <span className="text-canina-blue font-black text-xl italic font-sans">Canina</span>
                </Link>
                <button
                  onClick={() => setIsMobileMenuOpen(false)}
                  className="p-2 rounded-xl hover:bg-medical-gray-50 text-medical-gray-600 transition-all"
                >
                  <X className="w-6 h-6" />
                </button>
              </div>

              {/* Navigation Links */}
              <nav className="flex flex-col gap-2">
                {/* Treatment Solutions accordion */}
                <div className="flex flex-col">
                  <button
                    onClick={() => setIsMobileSolutionsOpen(!isMobileSolutionsOpen)}
                    className="w-full flex items-center justify-between px-4 py-3 rounded-xl text-sm font-black text-medical-gray-600 hover:bg-medical-gray-50 transition-all font-vazir"
                  >
                    <span>{getText('nav_solutions', "دسته بندی درمانی")}</span>
                    <ChevronDown className={`w-4 h-4 transition-transform duration-300 ${isMobileSolutionsOpen ? 'rotate-180' : ''}`} />
                  </button>
                  <AnimatePresence>
                    {isMobileSolutionsOpen && (
                      <motion.div
                        initial={{ height: 0, opacity: 0 }}
                        animate={{ height: "auto", opacity: 1 }}
                        exit={{ height: 0, opacity: 0 }}
                        className="overflow-hidden mr-4 pr-2 border-r-2 border-medical-gray-100 mt-1 space-y-3"
                      >
                        {menuItems.map((item, idx) => (
                          <div key={idx} className="py-1">
                            <Link
                              href={`/shop?category=${item.id}`}
                              onClick={() => setIsMobileMenuOpen(false)}
                              className="text-[13px] font-bold text-medical-gray-800 font-vazir hover:text-canina-blue cursor-pointer flex items-center gap-2 block"
                            >
                              <span className="text-canina-blue/80">{item.icon}</span>
                              <span>{item.title}</span>
                            </Link>
                            <ul className="mt-1 space-y-1 mr-6">
                              {item.solutions.map((sol, sIdx) => (
                                <li key={sIdx}>
                                  <Link
                                    href={`/shop?category=${item.id}&symptoms=${sol}`}
                                    className="text-[11px] text-medical-gray-500 hover:text-canina-blue cursor-pointer py-1 font-vazir block"
                                    onClick={() => setIsMobileMenuOpen(false)}
                                  >
                                    {sol}
                                  </Link>
                                </li>
                              ))}
                            </ul>
                          </div>
                        ))}
                      </motion.div>
                    )}
                  </AnimatePresence>
                </div>

                {[
                  { id: 'shop', label: getText('nav_products', 'محصولات تخصصی'), href: '/shop' },
                  { id: 'wiki', label: getText('nav_wiki', 'دانشنامه علمی'), href: '/wiki' },
                  { id: 'blog', label: getText('nav_blog', 'مجله سلامت پت'), href: '/blog' },
                  { id: 'profile', label: getText('nav_pet_profiles', 'شناسنامه پت'), href: '/profile' }
                ].map((item) => (
                  <Link
                    key={item.id}
                    href={item.href}
                    onClick={() => setIsMobileMenuOpen(false)}
                    className={`w-full block text-right px-4 py-3 rounded-xl text-sm font-black transition-all font-vazir ${currentView === item.id
                        ? 'bg-canina-blue/5 text-canina-blue'
                        : 'text-medical-gray-600 hover:bg-medical-gray-50'
                      }`}
                  >
                    {item.label}
                  </Link>
                ))}
              </nav>
            </motion.div>
          </>
        )}
      </AnimatePresence>
    </>
  );
}