/**
 * @license
 * SPDX-License-Identifier: Apache-2.0
 */

import { useState, useEffect, lazy, Suspense } from "react";
import Header from "./components/Header";
import Hero from "./components/Hero";
import Footer from "./components/Footer";
import { Toaster } from "sonner";
import { Product } from "./data/products";
import { useCartStore } from "./store/cartStore";
import { usePetStore } from "./store/usePetStore";
import { NetworkBanner } from './components/NetworkBanner';
import { ErrorBoundary } from './components/ErrorBoundary';
import { NotFoundPage } from './components/ErrorPages';
import { toast } from "sonner";
import labImage from "./assets/images/regenerated_image_1779109861747.png";

// Lazy Loaded Components
const ArchivePage = lazy(() => import("./components/ArchivePage"));
const ProductPage = lazy(() => import("./components/ProductPage"));
const PetProfile = lazy(() => import("./components/PetProfile"));
const UserDashboard = lazy(() => import("./components/UserDashboard"));
const SearchResultsPage = lazy(() => import("./components/SearchResultsPage"));
const IngredientWiki = lazy(() => import("./components/IngredientWiki"));
const BlogPage = lazy(() => import("./components/BlogPage"));
const VideosPage = lazy(() => import("./components/VideosPage"));
const CheckoutPage = lazy(() => import("./components/CheckoutPage"));
const OrderSuccess = lazy(() => import("./components/OrderSuccess"));
const OrderTracking = lazy(() => import("./components/OrderTracking"));
const SmartAdvisor = lazy(() => import("./components/SmartAdvisor"));
const LoginModal = lazy(() => import("./components/LoginModal"));
const CartDrawer = lazy(() => import("./components/CartDrawer"));
const B2BPortal = lazy(() => import("./components/B2BPortal"));
const FeaturedProducts = lazy(() => import("./components/FeaturedProducts"));
const VetGallery = lazy(() => import("./components/VetGallery"));

type View = "home" | "shop" | "wiki" | "product-detail" | "profile" | "checkout" | "search" | "order-success" | "order-tracking" | "blog" | "videos" | "user-dashboard";

function LoadingFallback() {
  return (
    <div className="h-[60vh] flex flex-col items-center justify-center bg-medical-gray-50/50 backdrop-blur-sm">
      <div className="w-16 h-16 border-4 border-canina-blue/10 border-t-canina-blue rounded-full animate-spin mb-4" />
      <span className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest animate-pulse font-vazir">در حال آماده‌سازی لابراتوار...</span>
    </div>
  );
}

export default function App() {
  const [currentView, setCurrentView] = useState<View>("home");
  const [subView, setSubView] = useState<any>(null);
  const [advisorRecommendation, setAdvisorRecommendation] = useState<string | null>(null);
  const [advisorData, setAdvisorData] = useState<any>(null);
  const [selectedProduct, setSelectedProduct] = useState<Product | null>(null);
  const [lastOrderId, setLastOrderId] = useState<string | null>(null);
  const [initialCategory, setInitialCategory] = useState("all");
  const [initialSearch, setInitialSearch] = useState("");
  const [isCartOpen, setIsCartOpen] = useState(false);
  const [showB2B, setShowB2B] = useState(false);
  const [isLoggedIn, setIsLoggedIn] = useState(false);
  const [showLoginModal, setShowLoginModal] = useState(false);
  const [isLoading, setIsLoading] = useState(true);
  const [searchQuery, setSearchQuery] = useState("");

  useEffect(() => {
    const init = async () => {
      // Simulating initial data load
      await new Promise(resolve => setTimeout(resolve, 800));
      setIsLoading(false);
    };
    init();
  }, []);
  useEffect(() => {
    const handlePopState = (event: PopStateEvent) => {
      const params = new URLSearchParams(window.location.search);
      const category = params.get("category") || "all";
      const search = params.get("search") || "";
      
      setInitialCategory(category);
      setInitialSearch(search);
      setCurrentView("shop");
    };

    window.addEventListener("popstate", handlePopState);
    return () => window.removeEventListener("popstate", handlePopState);
  }, []);

  const { clearCart, addOrder, getTotal, items } = useCartStore();
  const { getActivePet, pets } = usePetStore();

  // Global Scroll To Top on view change
  useEffect(() => {
    window.scrollTo({ top: 0, behavior: "smooth" });
  }, [currentView]);

  const handleProductClick = (product: Product) => {
    setSelectedProduct(product);
    setCurrentView("product-detail");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const navigateToShop = (category: string = "all", search: string = "") => {
    // Update URL with search params
    const params = new URLSearchParams();
    if (category && category !== "all") params.set("category", category);
    if (search) params.set("search", search);
    
    const newUrl = params.toString() ? `?${params.toString()}` : "/shop";
    window.history.pushState({ category, search }, "", newUrl);

    setInitialCategory(category);
    setInitialSearch(search);
    setCurrentView("shop");
    window.scrollTo({ top: 0, behavior: "smooth" });
  };

  const navigateToWiki = () => {
    setCurrentView("wiki");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const handleNavigate = (v: any) => {
    if (typeof v === 'object') {
      setCurrentView(v.view);
      setSubView(v.subview || null);
    } else {
      setCurrentView(v);
      setSubView(null);
    }
  };

  const navigateToProfile = (subview: any = "index") => {
    setCurrentView("profile");
    setSubView(subview);
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const navigateToDashboard = () => {
    setCurrentView("user-dashboard");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const handleCheckout = () => {
    setIsCartOpen(false);
    setCurrentView("checkout");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const handleSearch = (q: string) => {
    setSearchQuery(q);
    setCurrentView("search");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const finalizeOrder = () => {
    const activePet = getActivePet();
    const orderId = addOrder({
      items,
      total: getTotal(),
      petId: activePet?.id
    });
    setLastOrderId(orderId);
    clearCart();
    setCurrentView("order-success");
    window.scrollTo({ top: 0, behavior: 'smooth' });
  };

  const handleAdvisorComplete = (data: any) => {
    setAdvisorData(data);
    
    if (!isLoggedIn) {
      setShowLoginModal(true);
    } else {
      processAdvisorResult(data);
    }
  };

  const processAdvisorResult = (data?: any) => {
    const d = data || advisorData;
    if (!d) return;

    // Map medical conditions to a broad recommendation category for the suggested items logic in PetProfile
    if (d.medicalConditions.includes("جراحی مفاصل")) setAdvisorRecommendation("joints");
    else if (d.medicalConditions.includes("مشکلات گوارشی")) setAdvisorRecommendation("digestion");
    else if (d.medicalConditions.includes("ریزش موی شدید")) setAdvisorRecommendation("skin");
    else if (d.medicalConditions.includes("بی‌اشتهایی") || d.medicalConditions.includes("زایمان اخیر") || d.medicalConditions.includes("بارداری")) setAdvisorRecommendation("vitamins");

    // Clear recommended items and add the pet to the store
    const { addPet } = usePetStore.getState();
    addPet(d);
    
    toast.success(`تحلیل سلامت ${d.name} آماده است! شناسنامه صادر شد.`);
    navigateToProfile("detail");
    setAdvisorData(null);
  };

  const handleLogin = () => {
    setIsLoggedIn(true);
    setShowLoginModal(false);
    
    if (advisorData) {
      toast.success(`خوش آمدید! مشخصات ${advisorData.name} در شناسنامه ثبت شد.`);
      processAdvisorResult();
    } else {
      toast.success("خوش آمدید!");
    }
  };

  const renderView = () => {
    if (isLoading) {
      return (
        <div className="h-screen flex flex-col items-center justify-center bg-medical-gray-50">
          <div className="w-20 h-20 border-4 border-canina-blue/20 border-t-canina-blue rounded-full animate-spin mb-6" />
          <div className="flex items-center gap-2">
             <div className="w-10 h-10 bg-canina-blue rounded-2xl flex items-center justify-center text-white font-bold text-xl shadow-xl shadow-canina-blue/20 italic">C</div>
             <span className="text-[12px] font-black text-medical-gray-900 uppercase tracking-widest animate-pulse">Canina Pharma Laboratory</span>
          </div>
        </div>
      );
    }

    return (
      <Suspense fallback={<LoadingFallback />}>
        {(() => {
          switch (currentView) {
            case "user-dashboard":
              return <UserDashboard onBack={() => setCurrentView("home")} onNavigate={handleNavigate} />;
            case "search":
              return (
                <SearchResultsPage 
                  query={searchQuery} 
                  onProductClick={handleProductClick} 
                  onBack={() => setCurrentView("home")} 
                />
              );
            case "checkout":
              return <CheckoutPage onBack={() => setIsCartOpen(true)} onComplete={finalizeOrder} />;
            case "product-detail":
              return selectedProduct ? (
                <ProductPage 
                  product={selectedProduct} 
                  onBack={() => setCurrentView("shop")} 
                  onProductClick={handleProductClick} 
                  onWikiNavigate={() => setCurrentView("wiki")}
                  onShopNavigate={navigateToShop}
                />
              ) : null;
            case "shop":
              return <ArchivePage onProductClick={handleProductClick} initialCategory={initialCategory} initialSearch={initialSearch} onBack={() => setCurrentView("home")} onShopNavigate={navigateToShop} />;
            case "home":
              return (
                <>
                  <Hero onProfileClick={() => navigateToProfile("detail")} onShopNavigate={() => navigateToShop()} />
                  <SmartAdvisor onComplete={handleAdvisorComplete} />
                  <FeaturedProducts onProductClick={handleProductClick} onShopNavigate={() => navigateToShop()} />
                  <VetGallery onNavigate={handleNavigate} />
                  
                  {/* Navigation to Sections */}
                  <section className="py-20 bg-medical-gray-50 border-y border-medical-gray-100">
                      <div className="max-w-7xl mx-auto px-4 grid md:grid-cols-2 gap-8">
                          <div 
                              onClick={() => navigateToShop()}
                              className="bg-white p-12 rounded-[3.5rem] border border-medical-gray-200 shadow-sm hover:shadow-2xl hover:-translate-y-2 transition-all cursor-pointer group"
                          >
                              <h3 className="text-3xl font-black text-medical-gray-900 mb-4 group-hover:text-canina-blue transition-colors italic">فروشگاه تخصصی</h3>
                              <p className="text-medical-gray-500 mb-8 leading-relaxed">دسترسی به تمامی محصولات بر اساس علائم بالینی و نیازهای پت شما.</p>
                              <div className="flex items-center gap-2 text-canina-blue font-black tracking-widest uppercase text-xs">
                                  کاتالوگ کامل محصولات
                                  <span className="text-lg">←</span>
                              </div>
                          </div>
                          <div 
                              onClick={navigateToWiki}
                              className="bg-medical-gray-900 p-12 rounded-[3.5rem] text-white hover:shadow-2xl hover:-translate-y-2 transition-all cursor-pointer group"
                          >
                              <h3 className="text-3xl font-black mb-4 group-hover:text-canina-blue transition-colors italic">دانشنامه علمی</h3>
                              <p className="text-white/60 mb-8 leading-relaxed">آشنایی با ترکیبات نایاب و استانداردهای دارویی محصولات آلمانی کانینا.</p>
                              <div className="flex items-center gap-2 text-canina-blue font-black tracking-widest uppercase text-xs">
                                  مطالعه مقالات تخصصی
                                  <span className="text-lg">←</span>
                              </div>
                          </div>
                      </div>
                  </section>

                  {/* About Section Teaser */}
                  <section className="py-24 bg-white overflow-hidden">
                      <div className="max-w-7xl mx-auto px-4 grid lg:grid-cols-2 gap-16 items-center">
                          <div className="relative">
                              <div className="absolute -top-10 -right-10 w-40 h-40 bg-canina-blue/5 rounded-full blur-3xl" />
                              <img 
                                  src={labImage} 
                                  alt="Laboratory" 
                                  className="rounded-[3rem] shadow-2xl relative z-10 grayscale-[10%]"
                              />
                              <div className="absolute -bottom-6 -left-6 bg-canina-blue text-white p-8 rounded-3xl shadow-xl z-20">
                                  <div className="text-4xl font-black mb-1 italic">کیفیت</div>
                                  <div className="text-xs uppercase tracking-widest font-bold opacity-80">استانداردهای فوق‌دارویی</div>
                              </div>
                          </div>
                          <div>
                              <div className="text-canina-blue text-xs font-bold uppercase tracking-[0.2em] mb-4">میراث ما از آلمان</div>
                              <h2 className="text-3xl lg:text-5xl font-black text-medical-gray-900 leading-[1.2] mb-8">
                                  چرا برند آلمانی <span className="text-canina-blue italic">Canina</span> مرجع دامپزشکان است؟
                              </h2>
                              <div className="space-y-6">
                                  {[
                                      { title: "مواد اولیه نایاب", desc: "استفاده از پودر صدف لب‌سبز اصل نیوزیلند و مواد ارگانیک با گرید دارویی." },
                                      { title: "فاقد مواد نگهدارنده", desc: "تمامی محصولات ۱۰۰٪ طبیعی و فاقد رنگ‌های مصنوعی و طعم‌دهنده‌های شیمیایی هستند." },
                                      { title: "تاییدیه اروپا", desc: "مطابق با سخت‌گیرانه‌ترین استانداردهای ایمنی مواد غذایی و دارویی در اتحادیه اروپا." }
                                  ].map((item, idx) => (
                                      <div key={idx} className="flex gap-4">
                                          <div className="w-12 h-12 rounded-2xl bg-medical-gray-50 flex items-center justify-center flex-shrink-0 text-canina-blue font-bold">
                                              {idx + 1}
                                          </div>
                                          <div>
                                              <h4 className="text-lg font-bold text-medical-gray-900 mb-1">{item.title}</h4>
                                              <p className="text-sm text-medical-gray-500 leading-relaxed font-medium">{item.desc}</p>
                                          </div>
                                      </div>
                                  ))}
                              </div>
                          </div>
                      </div>
                  </section>
                </>
              );
            case "wiki":
              return <IngredientWiki onProductClick={handleProductClick} onBack={() => setCurrentView("home")} />;
            case "profile":
              return <PetProfile onProductClick={handleProductClick} onBack={() => setCurrentView("home")} initialView={subView} advisorNeed={advisorRecommendation} />;
            case "order-success":
              return lastOrderId ? <OrderSuccess orderId={lastOrderId} onNavigate={handleNavigate} /> : null;
            case "order-tracking":
              return <OrderTracking onNavigate={handleNavigate} onBack={() => setCurrentView("home")} />;
            case "blog":
              return <BlogPage onBack={() => setCurrentView("home")} onProductClick={handleProductClick} />;
            case "videos":
              return <VideosPage onBack={() => setCurrentView("home")} />;
            default:
              return <NotFoundPage onGoHome={() => setCurrentView("home")} />;
          }
        })()}
      </Suspense>
    );
  };

  return (
    <ErrorBoundary>
      <div className="min-h-screen bg-medical-gray-50 font-sans" dir="rtl">
        <NetworkBanner />
        <Header 
          onNavigate={handleNavigate} 
        onShopNavigate={navigateToShop} 
        currentView={currentView}
        onCartOpen={() => setIsCartOpen(true)}
        onSearch={handleSearch}
        onB2BOpen={() => setShowB2B(true)}
      />
      <main>
        {renderView()}
        
        {/* Call to Action */}
        <section className="bg-canina-blue py-20 relative overflow-hidden">
            <div className="absolute inset-0 opacity-10">
                <div className="grid grid-cols-10 h-full w-full">
                    {Array.from({length: 100}).map((_, i) => (
                        <div key={i} className="border border-white/20" />
                    ))}
                </div>
            </div>
            <div className="max-w-4xl mx-auto px-4 text-center relative z-10">
                <h2 className="text-3xl lg:text-5xl font-black text-white mb-8 leading-tight">
                    می‌خواهید بدانید کدام محصول برای پت شما مناسب‌تر است؟
                </h2>
                <p className="text-white/80 text-lg mb-10 leading-relaxed">
                    تیم متخصص دامپزشکی کانینا ایران آماده پاسخگویی به سوالات شماست.
                </p>
                <div className="flex flex-wrap justify-center gap-4">
                    <button className="bg-white text-canina-blue px-12 py-5 rounded-full font-black text-xl hover:scale-105 transition-transform shadow-2xl shadow-black/20">
                        دریافت رژیم مکمل رایگان
                    </button>
                    <button 
                        onClick={() => navigateToShop()}
                        className="bg-canina-blue/20 backdrop-blur-md border-2 border-white text-white px-12 py-5 rounded-full font-black text-xl hover:bg-white hover:text-canina-blue transition-all"
                    >
                        ورود به محصولات تخصصی
                    </button>
                </div>
            </div>
        </section>
      </main>

      <Footer onNavigate={handleNavigate} onShopNavigate={navigateToShop} onB2BOpen={() => setShowB2B(true)} />
        <Suspense fallback={null}>
          {showB2B && <B2BPortal onClose={() => setShowB2B(false)} />}
          <CartDrawer 
            isOpen={isCartOpen} 
            onClose={() => setIsCartOpen(false)} 
            onCheckout={handleCheckout} 
            onShopNavigate={navigateToShop}
          />
          <LoginModal 
            isOpen={showLoginModal} 
            onClose={() => {
              setShowLoginModal(false);
              setAdvisorData(null); // Clear advisor data if closed without login
            }} 
            onLogin={handleLogin} 
            petName={advisorData?.name}
            isAdvisorContext={!!advisorData}
          />
        </Suspense>
      <Toaster position="top-center" expand={true} richColors />
    </div>
    </ErrorBoundary>
  );
}