"use client";
import React, { useState, useEffect } from "react";
import { motion } from "motion/react";
import { 
  ChevronRight, 
  ChevronLeft,
  CreditCard, 
  Truck, 
  ShieldCheck, 
  Wallet,
  Clock,
  ArrowRight,
  Heart,
  PlusCircle,
  Copy,
  Phone,
  AlertCircle
} from "lucide-react";
import { toPersian, cn } from "../lib/utils";
import { PRODUCTS } from "../lib/data/products";
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 TopUpModal from "./TopUpModal";
import AddressModal from "./AddressModal";
import SearchableSelect from "./SearchableSelect";
import { IRAN_PROVINCES, PROVINCE_CITIES } from "../lib/data/provinces";
import { toast } from "sonner";
import { useRouter } from 'next/navigation';
import api from "../lib/services/api";

export default function CheckoutPage() {
  const router = useRouter();
  const { items, getTotal, getSubtotal, isSubscribed, charityDonation, setCharityDonation, addOrder, clearCart } = useCartStore();
  const { pets, activePetId, getActivePet, updatePet } = usePetStore();
  const { profile, isLoggedIn } = useUserStore();
  const [loading, setLoading] = useState(false);
  const [useRoundUp, setUseRoundUp] = useState(false);
  const [paymentMethod, setPaymentMethod] = useState<string>('card');
  const [showTopUpModal, setShowTopUpModal] = useState(false);
  const [showAddressModal, setShowAddressModal] = useState(false);

  const isRefillEnabled = useSettingsStore((state) => state.getText('REFILL_SUBSCRIPTION_ENABLED', 'false') === 'true');
  const refillPercent = Number(useSettingsStore((state) => state.getText('REFILL_REWARD_PERCENT', '5'))) || 5;

  const [selectedPetId, setSelectedPetId] = useState<string | null>(activePetId || (pets[0]?.id ?? null));
  const [selectedAddressId, setSelectedAddressId] = useState<string>('');
  
  // Custom manual address state if guest or not using stored addresses
  const [manualName, setManualName] = useState('');
  const [manualPhone, setManualPhone] = useState('');
  const [manualProvince, setManualProvince] = useState('');
  const [manualCity, setManualCity] = useState('');
  const [manualZipCode, setManualZipCode] = useState('');
  const [manualAddress, setManualAddress] = useState('');

  const handleCopy = (text: string, title: string) => {
    navigator.clipboard.writeText(text);
    toast.success(`${title} با موفقیت کپی شد!`);
  };

  useEffect(() => {
    Promise.resolve().then(() => {
      // Set default selected address if logged in
      if (isLoggedIn && profile.addresses && profile.addresses.length > 0) {
        const def = profile.addresses.find(a => a.isDefault) || profile.addresses[0];
        setSelectedAddressId(def.id);
      } else if (isLoggedIn && profile.firstName) {
        // Pre-fill profile info for manual fields
        setManualName(`${profile.firstName} ${profile.lastName}`.trim());
        setManualPhone(profile.mobile || '');
      }
    });
  }, [isLoggedIn, profile]);

  const roundStep = Number(useSettingsStore((state) => state.getText('CHARITY_ROUND_STEP', '10000'))) || 10000;
  const shippingFeeSetting = useSettingsStore((state) => state.getText('shipping_fee', '0'));
  const baseShippingFee = Number(shippingFeeSetting) || 0;
  const freeThreshold = Number(useSettingsStore((state) => state.getText('free_shipping_threshold', '2000000'))) || 0;
  const subtotal = getSubtotal();
  const shippingFee = (freeThreshold > 0 && subtotal >= freeThreshold) ? 0 : baseShippingFee;

  const isCardToCardEnabled = useSettingsStore((state) => 
    state.getBoolean('PAY_GATEWAY_CARD_ENABLE', true) && 
    state.getBoolean('cardToCardEnabled', true) && 
    state.getBoolean('cart_to_cart_enabled', true) &&
    state.getBoolean('payment_card_to_card_enabled', true)
  );
  const remainder = subtotal % roundStep;
  const roundUpDiff = remainder === 0 ? roundStep : roundStep - remainder;

  const handleCharityToggle = () => {
    if (!useRoundUp) {
      setCharityDonation(roundUpDiff);
      setUseRoundUp(true);
    } else {
      setCharityDonation(0);
      setUseRoundUp(false);
    }
  };

  const handleFinalize = async () => {
    const totalAmount = getTotal() + shippingFee;
    const activePet = getActivePet();

    // 1. Validate shipping address
    const selectedAddr = profile.addresses?.find(a => a.id === selectedAddressId);
    let shippingAddressStr = '';
    if (selectedAddr) {
      shippingAddressStr = `${selectedAddr.province}، ${selectedAddr.city}، ${selectedAddr.detail}${selectedAddr.zipCode ? ` (کد پستی: ${selectedAddr.zipCode})` : ''} (گیرنده: ${selectedAddr.receptorName} - ${toPersian(selectedAddr.phone)})`;
    } else if (manualAddress) {
      const provCity = [manualProvince, manualCity].filter(Boolean).join('، ');
      shippingAddressStr = `${provCity ? provCity + '، ' : ''}${manualAddress}${manualZipCode ? ` (کد پستی: ${manualZipCode})` : ''}${manualName ? ` (گیرنده: ${manualName}${manualPhone ? ` - ${toPersian(manualPhone)}` : ''})` : ''}`;
    }

    if (!selectedAddressId && !manualAddress) {
      toast.error("لطفاً یک آدرس برای ارسال سفارش انتخاب کرده یا آدرس جدید وارد کنید.");
      return;
    }

    // 2. Validate wallet balance if payment method is wallet
    if (paymentMethod === 'wallet' && (profile.walletBalance || 0) < totalAmount) {
      const neededAmount = totalAmount - (profile.walletBalance || 0);
      toast.error(
        `موجودی کیف پول شما (${(profile.walletBalance || 0).toLocaleString('fa-IR')} تومان) کمتر از مبلغ سفارش (${totalAmount.toLocaleString('fa-IR')} تومان) است. کادر افزایش موجودی (${neededAmount.toLocaleString('fa-IR')} تومان) باز شد.`,
      );
      setShowTopUpModal(true);
      return;
    }

    setLoading(true);

    try {
      // 3. Register the order in the backend
      const orderId = await addOrder({
        items: [...items],
        total: totalAmount,
        charityDonation: charityDonation,
        paymentMethod: paymentMethod,
        isRefill: isSubscribed,
        petId: selectedPetId || undefined,
        shippingAddress: shippingAddressStr
      });

      // 4. Handle Online Payment via Zibal IPG
      if (paymentMethod === 'online') {
        try {
          const res = await api.post('/payment/zibal/initiate', { orderId });
          if (res.data?.paymentUrl) {
            toast.success("در حال انتقال به درگاه پرداخت زیبال...");
            window.location.href = res.data.paymentUrl;
            return;
          } else {
            toast.error("خطا در ایجاد تراکنش پرداخت زیبال");
          }
        } catch (gatewayErr: unknown) {
          const gErr = gatewayErr as { response?: { data?: { message?: string } }; message?: string };
          const errMsg = gErr.response?.data?.message || gErr.message || "خطا در اتصال به درگاه پرداخت زیبال";
          toast.error(errMsg);
          router.push(`/checkout/success/${orderId}`);
          return;
        }
      }

      // 5. Re-fetch user profile from backend to sync PostgreSQL wallet balance and charity donation total
      const { fetchProfile } = useUserStore.getState();
      await fetchProfile();

      // 6. Update pet consumptions and charity contributions for active pet
      const targetPet = activePet || usePetStore.getState().pets[0];
      if (targetPet) {
        const newConsumptions = [...(targetPet.consumptions || [])];
        
        items.forEach(item => {
          const existing = newConsumptions.find(c => c.productId === item.product.id);
          if (existing) {
            existing.remaining += item.product.packageSize * item.quantity;
            existing.packageSize = item.product.packageSize;
          } else {
            newConsumptions.push({
              productId: item.product.id,
              packageSize: item.product.packageSize,
              remaining: item.product.packageSize * item.quantity
            });
          }
        });

        updatePet(targetPet.id, { 
          consumptions: newConsumptions
        });
      }

      clearCart();
      toast.success("سفارش شما با موفقیت ثبت شد!");
      router.push(`/checkout/success/${orderId}`);
    } catch (err: unknown) {
      // Re-fetch profile to guarantee local state is always identical to PostgreSQL
      useUserStore.getState().fetchProfile().catch(() => {});
      if (!(err as Record<string, boolean>)?._toastShown) {
        const errorObj = err as { response?: { data?: { message?: string; details?: Array<{ message?: string }> } }; message?: string };
        const backendMessage = errorObj.response?.data?.message || errorObj.response?.data?.details?.[0]?.message || errorObj.message;
        if (backendMessage && !backendMessage.includes("Request failed")) {
          toast.error(`خطا در ثبت سفارش: ${backendMessage}`);
        }
      }
    } finally {
      setLoading(false);
    }
  };

  const getText = useSettingsStore(state => state.getText);
  const isCatalogMode = getText('catalog_mode', 'false') === 'true';
  const isCatalogDisableCheckout = getText('catalog_disable_checkout', 'false') === 'true';
  const isCheckoutDisabled = isCatalogMode || isCatalogDisableCheckout;

  if (isCheckoutDisabled) {
    return (
      <div className="min-h-[70vh] bg-medical-gray-50 flex items-center justify-center p-6 text-center font-vazir" dir="rtl">
        <div className="max-w-md bg-white border border-medical-gray-200 rounded-3xl p-8 shadow-xl space-y-6">
          <div className="w-16 h-16 bg-amber-50 text-amber-600 rounded-2xl flex items-center justify-center mx-auto">
            <AlertCircle className="w-8 h-8" />
          </div>
          <h2 className="text-xl font-black text-medical-gray-900">
            امکان ثبت سفارش آنلاین موقتاً غیرفعال است
          </h2>
          <p className="text-xs sm:text-sm text-medical-gray-600 font-bold leading-relaxed">
            سامانه در حال حاضر در حالت کاتالوگ قرار دارد. جهت استعلام قیمت و دریافت مشاوره تخصصی می‌توانید با کارشناسان ما تماس بگیرید.
          </p>
          <div className="flex flex-col sm:flex-row gap-3 pt-2">
            <a
              href={getText('contact_phone_link', `tel:${getText('contact_phone', '02188884444').replace(/[^0-9+]/g, '')}`)}
              className="flex-1 px-4 py-3 bg-canina-blue hover:bg-canina-dark text-white rounded-xl text-xs font-black transition-all shadow-md flex items-center justify-center gap-2"
            >
              <Phone className="w-4 h-4" />
              <span>تماس با پشتیبانی ({getText('contact_phone', '۰۲۱-۸۸۸۸۴۴۴۴')})</span>
            </a>
            <button
              onClick={() => router.push('/shop')}
              className="flex-1 px-4 py-3 bg-medical-gray-100 hover:bg-medical-gray-200 text-medical-gray-700 rounded-xl text-xs font-bold transition-all"
            >
              مشاهده کاتالوگ
            </button>
          </div>
        </div>
      </div>
    );
  }
  if (items.length === 0) {
    return (
      <div className="min-h-screen bg-medical-gray-50 flex items-center justify-center p-6" dir="rtl">
        <div className="text-center space-y-6">
          <div className="w-24 h-24 bg-white rounded-full flex items-center justify-center mx-auto text-medical-gray-200">
             <ShieldCheck className="w-12 h-12" />
          </div>
          <h2 className="text-2xl font-black text-medical-gray-900 italic">سبد خرید شما خالی است</h2>
          <button onClick={() => router.push('/shop')} className="text-canina-blue font-black underline underline-offset-8">بازگشت به فروشگاه</button>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen bg-medical-gray-50/60 py-4 sm:py-8 px-3 sm:px-6 font-vazir w-full max-w-full overflow-x-hidden text-right" dir="rtl">
      <div className="max-w-7xl mx-auto w-full">
        
        {/* Navigation & Breadcrumbs */}
        <div className="flex items-center justify-between gap-2 mb-5">
          <div className="flex items-center gap-2 text-xs font-bold text-medical-gray-500">
            <button 
              onClick={() => router.back()}
              className="flex items-center gap-1 hover:text-canina-blue transition-colors cursor-pointer"
            >
              <ChevronRight className="w-4 h-4" />
              <span>بازگشت</span>
            </button>
            <span className="text-medical-gray-300">/</span>
            <span className="cursor-pointer hover:text-canina-blue" onClick={() => router.push('/shop')}>سبد خرید</span>
            <span className="text-medical-gray-300">/</span>
            <span className="text-canina-blue font-black">تسویه‌حساب و پرداخت</span>
          </div>
          <div className="hidden sm:flex items-center gap-1.5 text-xs text-emerald-700 bg-emerald-50 border border-emerald-200 px-3 py-1 rounded-full font-bold">
            <ShieldCheck className="w-3.5 h-3.5" />
            <span>پرداخت ۱۰۰٪ امن با پروتکل SSL</span>
          </div>
        </div>

        <div className="grid lg:grid-cols-12 gap-5 w-full items-start">
          {/* Main Content (8 cols) */}
          <div className="lg:col-span-8 space-y-4 w-full min-w-0">
            
            {/* Step 1: Shipping */}
            <section className="bg-white rounded-2xl border border-medical-gray-200 p-4 sm:p-6 shadow-xs relative w-full overflow-hidden">
               <div className="flex items-center justify-between pb-3 mb-4 border-b border-medical-gray-100">
                 <div className="flex items-center gap-2.5">
                   <div className="w-7 h-7 bg-canina-blue text-white rounded-lg flex items-center justify-center font-black text-xs">۱</div>
                   <h2 className="text-base sm:text-lg font-black text-medical-gray-900">اطلاعات تحویل و گیرنده</h2>
                 </div>
                 {isLoggedIn && (
                   <button
                     type="button"
                     onClick={() => setShowAddressModal(true)}
                     className="flex items-center gap-1 text-canina-blue font-bold text-xs hover:underline bg-canina-blue/5 border border-canina-blue/20 px-2.5 py-1 rounded-lg transition-all cursor-pointer"
                   >
                     <PlusCircle className="w-3.5 h-3.5" />
                     <span>+ افزودن آدرس</span>
                   </button>
                 )}
               </div>
               
               {isLoggedIn && profile.addresses && profile.addresses.length > 0 ? (
                 <div className="space-y-3">
                   <div className="grid sm:grid-cols-2 gap-2.5">
                     {profile.addresses.map((addr) => (
                       <div
                         key={addr.id}
                         onClick={() => setSelectedAddressId(addr.id)}
                         className={cn(
                           "p-3 rounded-xl border transition-all flex items-start gap-2.5 cursor-pointer",
                           selectedAddressId === addr.id ? "border-canina-blue bg-canina-blue/5 shadow-xs" : "border-medical-gray-200 hover:border-medical-gray-300"
                         )}
                       >
                         <input
                           type="radio"
                           name="selectedAddress"
                           checked={selectedAddressId === addr.id}
                           onChange={() => setSelectedAddressId(addr.id)}
                           className="mt-1 shrink-0 cursor-pointer"
                         />
                         <div className="flex-1 min-w-0">
                           <div className="flex items-center gap-2 mb-0.5">
                             <span className="font-black text-xs text-medical-gray-900">{addr.title}</span>
                             {addr.isDefault && (
                               <span className="bg-canina-blue/10 text-canina-blue text-[9px] font-bold px-1.5 py-0.2 rounded-md">پیش‌فرض</span>
                             )}
                           </div>
                           <p className="text-[11px] text-medical-gray-600 line-clamp-2 leading-relaxed">{addr.province}، {addr.city}، {addr.detail}</p>
                           <p className="text-[10px] text-medical-gray-400 font-bold mt-1">گیرنده: {addr.receptorName} ({toPersian(addr.phone)})</p>
                         </div>
                       </div>
                     ))}
                   </div>
                 </div>
               ) : (
                 <div className="grid grid-cols-1 sm:grid-cols-2 md:grid-cols-4 gap-3">
                   <div>
                     <label htmlFor="chk-fullname" className="text-[11px] font-bold text-medical-gray-700 block mb-1">نام و نام خانوادگی *</label>
                     <input
                       id="chk-fullname"
                       name="name"
                       type="text"
                       autoComplete="name"
                       value={manualName}
                       onChange={(e) => setManualName(e.target.value)}
                       className="w-full bg-medical-gray-50/70 border border-medical-gray-200 rounded-xl py-2 px-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none"
                       placeholder="مثلاً: پارسا آقایی"
                     />
                   </div>
                   <div>
                     <label htmlFor="chk-tel" className="text-[11px] font-bold text-medical-gray-700 block mb-1">شماره همراه *</label>
                     <input
                       id="chk-tel"
                       name="tel"
                       type="tel"
                       autoComplete="tel"
                       value={manualPhone}
                       onChange={(e) => setManualPhone(e.target.value.replace(/[^0-9]/g, ''))}
                       className="w-full bg-medical-gray-50/70 border border-medical-gray-200 rounded-xl py-2 px-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none dir-ltr text-right"
                       placeholder="۰۹۱۲XXXXXXX"
                     />
                   </div>
                   <div>
                     <label htmlFor="chk-province" className="text-[11px] font-bold text-medical-gray-700 block mb-1">استان *</label>
                     <SearchableSelect
                       id="chk-province"
                       options={IRAN_PROVINCES}
                       value={manualProvince}
                       placeholder="انتخاب استان..."
                       searchPlaceholder="جستجوی استان..."
                       onChange={(prov) => {
                         const cities = PROVINCE_CITIES[prov] || [];
                         setManualProvince(prov);
                         setManualCity(cities[0] || '');
                       }}
                     />
                   </div>
                   <div>
                     <label htmlFor="chk-city" className="text-[11px] font-bold text-medical-gray-700 block mb-1">شهر *</label>
                     {manualProvince && PROVINCE_CITIES[manualProvince] ? (
                       <SearchableSelect
                         id="chk-city"
                         options={PROVINCE_CITIES[manualProvince]}
                         value={manualCity}
                         placeholder="انتخاب شهر..."
                         searchPlaceholder="جستجوی شهر..."
                         onChange={(c) => setManualCity(c)}
                       />
                     ) : (
                       <input
                         id="chk-city"
                         type="text"
                         value={manualCity}
                         onChange={(e) => setManualCity(e.target.value)}
                         className="w-full bg-medical-gray-50/70 border border-medical-gray-200 rounded-xl py-2 px-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none"
                         placeholder="نام شهر..."
                       />
                     )}
                   </div>
                   <div className="sm:col-span-2 md:col-span-3">
                     <label htmlFor="chk-street" className="text-[11px] font-bold text-medical-gray-700 block mb-1">آدرس دقیق پستی *</label>
                     <input
                       id="chk-street"
                       name="street-address"
                       autoComplete="street-address"
                       value={manualAddress}
                       onChange={(e) => setManualAddress(e.target.value)}
                       className="w-full bg-medical-gray-50/70 border border-medical-gray-200 rounded-xl py-2 px-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none"
                       placeholder="خیابان، کوچه، پلاک، واحد..."
                     />
                   </div>
                   <div>
                     <label htmlFor="chk-zipcode" className="text-[11px] font-bold text-medical-gray-700 block mb-1">کد پستی (۱۰ رقمی)</label>
                     <input
                       id="chk-zipcode"
                       type="text"
                       maxLength={10}
                       value={manualZipCode}
                       onChange={(e) => setManualZipCode(e.target.value.replace(/[^0-9]/g, ''))}
                       className="w-full bg-medical-gray-50/70 border border-medical-gray-200 rounded-xl py-2 px-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none dir-ltr text-right"
                       placeholder="۱۲۳۴۵۶۷۸۹۰"
                     />
                   </div>
                 </div>
               )}
            </section>

            {/* Pet Selection (if user has pets) */}
            {pets.length > 0 && (
              <section className="bg-white rounded-2xl border border-medical-gray-200 p-4 shadow-xs">
                <div className="flex items-center gap-2 mb-2.5">
                  <span className="text-base">🐾</span>
                  <h3 className="text-xs font-black text-medical-gray-900">اتصال سفارش به پرونده سلامت حیوان خانگی:</h3>
                </div>
                <div className="flex flex-wrap gap-2">
                  <button
                    type="button"
                    onClick={() => setSelectedPetId(null)}
                    className={cn(
                      "px-3 py-1.5 rounded-xl border text-xs font-bold transition-all cursor-pointer",
                      selectedPetId === null ? "border-canina-blue bg-canina-blue/10 text-canina-blue" : "border-medical-gray-200 text-medical-gray-600 hover:bg-medical-gray-50"
                    )}
                  >
                    خرید عمومی (بدون پت)
                  </button>
                  {pets.map(p => (
                    <button
                      key={p.id}
                      type="button"
                      onClick={() => setSelectedPetId(p.id)}
                      className={cn(
                        "px-3 py-1.5 rounded-xl border text-xs font-bold transition-all cursor-pointer",
                        selectedPetId === p.id ? "border-canina-blue bg-canina-blue/10 text-canina-blue" : "border-medical-gray-200 text-medical-gray-600 hover:bg-medical-gray-50"
                      )}
                    >
                      {p.name} ({p.breed || p.type})
                    </button>
                  ))}
                </div>
              </section>
            )}

            {/* Step 2: Payment Methods */}
            <section className="bg-white rounded-2xl border border-medical-gray-200 p-4 sm:p-6 shadow-xs relative">
               <div className="flex items-center gap-2.5 pb-3 mb-4 border-b border-medical-gray-100">
                 <div className="w-7 h-7 bg-canina-blue text-white rounded-lg flex items-center justify-center font-black text-xs">۲</div>
                 <h2 className="text-base sm:text-lg font-black text-medical-gray-900">شیوه پرداخت</h2>
               </div>

               <div className="grid grid-cols-1 sm:grid-cols-2 gap-3">
                  {(() => {
                    const getText = useSettingsStore.getState().getText;
                    const allGateways = [
                      { 
                        id: 'online', 
                        label: getText('PAY_GATEWAY_ONLINE_LABEL', 'درگاه پرداخت اینترنتی (زیبال / شتاب)'), 
                        desc: 'پرداخت آنلاین و آنی با کلیه کارت‌های شتاب', 
                        icon: <ShieldCheck className="w-5 h-5" />,
                        enabled: getText('PAY_GATEWAY_ONLINE_ENABLE', 'true') === 'true'
                      },
                      { 
                        id: 'wallet', 
                        label: getText('PAY_GATEWAY_WALLET_LABEL', 'اعتبار حساب (کیف پول)'), 
                        desc: `موجودی: ${toPersian((profile.walletBalance || 0).toLocaleString())} تومان`, 
                        icon: <Wallet className="w-5 h-5" />,
                        enabled: getText('PAY_GATEWAY_WALLET_ENABLE', 'true') === 'true'
                      },
                      { 
                        id: 'card', 
                        label: getText('PAY_GATEWAY_CARD_LABEL', 'کارت به کارت (واریز مستقیم)'), 
                        desc: getText('PAY_GATEWAY_CARD_DESC', 'واریز به شماره کارت بانک سامان'), 
                        icon: <CreditCard className="w-5 h-5" />,
                        enabled: isCardToCardEnabled
                      },
                      { 
                        id: 'cod', 
                        label: getText('PAY_GATEWAY_COD_LABEL', 'پرداخت در محل (کارتخوان)'), 
                        desc: getText('PAY_GATEWAY_COD_DESC', 'تحویل کالا و پرداخت درب منزل'), 
                        icon: <Truck className="w-5 h-5" />,
                        enabled: getText('PAY_GATEWAY_COD_ENABLE', 'false') === 'true'
                      }
                    ];

                    const sortedGateways = [...allGateways].sort((a, b) => (b.enabled ? 1 : 0) - (a.enabled ? 1 : 0));

                    return sortedGateways.map((pay) => (
                      <div 
                        key={pay.id} 
                        onClick={() => {
                          if (pay.enabled) {
                            setPaymentMethod(pay.id);
                          } else {
                            toast.info("این روش پرداخت به زودی فعال خواهد شد.");
                          }
                        }}
                        className={cn(
                          "p-3.5 rounded-xl border-2 transition-all flex items-center justify-between gap-3 relative cursor-pointer",
                          pay.enabled 
                            ? (paymentMethod === pay.id ? "border-canina-blue bg-canina-blue/5 shadow-xs" : "border-medical-gray-200 hover:border-canina-blue/40")
                            : "border-medical-gray-100 bg-medical-gray-50 opacity-60 cursor-not-allowed"
                        )}
                      >
                         <div className="flex items-center gap-3 min-w-0">
                           <div className={cn(
                             "w-9 h-9 rounded-xl flex items-center justify-center shrink-0",
                             paymentMethod === pay.id ? "bg-canina-blue text-white" : "bg-medical-gray-100 text-medical-gray-500"
                           )}>
                             {pay.icon}
                           </div>
                           <div className="min-w-0">
                             <h4 className="font-bold text-xs text-medical-gray-900 truncate">{pay.label}</h4>
                             <p className="text-[10px] text-medical-gray-500 truncate mt-0.5">{pay.desc}</p>
                           </div>
                         </div>

                         {pay.id === 'wallet' && pay.enabled && (
                           <button 
                             type="button" 
                             onClick={(e) => {
                               e.stopPropagation();
                               setShowTopUpModal(true);
                             }}
                             className="text-[10px] bg-canina-blue text-white px-2.5 py-1 rounded-lg font-bold hover:bg-blue-700 transition-colors shrink-0 shadow-xs cursor-pointer"
                           >
                             + افزایش
                           </button>
                         )}
                      </div>
                    ));
                  })()}
               </div>

              {isCardToCardEnabled && paymentMethod === 'card' && (
                <div className="mt-4 bg-blue-50/80 border border-blue-200 rounded-xl p-3.5 space-y-2">
                  <div className="flex items-center gap-2 text-canina-blue font-bold text-xs">
                    <CreditCard className="w-4 h-4" />
                    <span>اطلاعات کارت جهت واریز وجه سفارش:</span>
                  </div>
                  <div className="grid grid-cols-1 sm:grid-cols-2 gap-2 text-xs bg-white p-3 rounded-lg border border-blue-100">
                    <div className="flex items-center justify-between p-2 bg-gray-50 rounded-lg">
                      <div>
                        <span className="text-[10px] text-gray-500 block">شماره کارت سامان:</span>
                        <span className="font-mono font-bold text-xs" dir="ltr">6219 8619 7401 2071</span>
                      </div>
                      <button 
                        type="button"
                        onClick={() => handleCopy("6219861974012071", "شماره کارت")}
                        className="text-[10px] text-canina-blue hover:underline font-bold"
                      >
                        کپی
                      </button>
                    </div>
                    <div className="flex items-center justify-between p-2 bg-gray-50 rounded-lg">
                      <div>
                        <span className="text-[10px] text-gray-500 block">صاحب حساب:</span>
                        <span className="font-bold text-xs text-gray-900">پارسادرمانی کنینا (نوواگارد)</span>
                      </div>
                    </div>
                  </div>
                </div>
              )}
            </section>

            {/* Charity Donation Banner (Compact) */}
            <section className="bg-pink-50/70 border border-pink-200/80 rounded-2xl p-3.5 flex items-center justify-between gap-3">
              <div className="flex items-center gap-2.5">
                <div className="w-8 h-8 bg-pink-500 text-white rounded-xl flex items-center justify-center shrink-0">
                  <Heart className="w-4 h-4 fill-white" />
                </div>
                <div>
                  <h4 className="text-xs font-bold text-medical-gray-900">کمک به حیوانات پناهگاه (ردپای مهربانی)</h4>
                  <p className="text-[10px] text-medical-gray-500">رند کردن مبلغ فاکتور تا {toPersian(roundStep.toLocaleString())} تومان بعدی</p>
                </div>
              </div>
              <button 
                type="button"
                onClick={handleCharityToggle}
                className={cn(
                  "px-3 py-1.5 rounded-xl text-xs font-bold transition-all shrink-0 cursor-pointer",
                  useRoundUp ? "bg-pink-500 text-white shadow-xs" : "bg-white text-pink-600 border border-pink-200 hover:bg-pink-50"
                )}
              >
                {useRoundUp ? `اهدای ${toPersian(charityDonation.toLocaleString())} ت` : 'مشارکت در خیریه'}
              </button>
            </section>
          </div>

          {/* Sticky Order Summary Sidebar (4 cols) */}
          <div className="lg:col-span-4 w-full">
            <div className="bg-medical-gray-900 rounded-2xl p-5 text-white shadow-xl sticky top-24 space-y-4">
               <div className="flex items-center justify-between border-b border-white/10 pb-3">
                 <h3 className="text-base font-black text-white">خلاصه سفارش</h3>
                 <span className="text-[11px] text-white/60 font-bold">{toPersian(items.length)} قلم کالا</span>
               </div>
               
               {/* Items List (Compact) */}
               <div className="space-y-2.5 max-h-48 overflow-y-auto pr-1">
                 {items.map((item) => (
                   <div key={item.product.id} className="flex justify-between items-center text-xs gap-2">
                      <div className="min-w-0 flex-1">
                        <p className="font-bold text-white/90 truncate">{item.product.name}</p>
                        <p className="text-[10px] text-white/50">{toPersian(item.quantity)} بسته</p>
                      </div>
                      <span className="font-bold font-vazir text-white whitespace-nowrap">
                        {toPersian((item.product.priceValue * item.quantity).toLocaleString())} ت
                      </span>
                   </div>
                 ))}
               </div>

               {/* Cost Breakdown */}
               <div className="space-y-2 pt-3 border-t border-white/10 text-xs">
                  <div className="flex justify-between text-white/80">
                    <span>مجموع اقلام</span>
                    <span className="font-vazir text-white">{toPersian(getSubtotal().toLocaleString())} تومان</span>
                  </div>
                  
                  {isRefillEnabled && isSubscribed && (
                    <div className="flex justify-between text-xs font-bold text-emerald-400 bg-emerald-500/10 p-2 rounded-xl border border-emerald-500/20">
                      <span>رزرو تمدید ({toPersian(refillPercent)}٪ پاداش خرید بعد):</span>
                      <span className="font-vazir">{toPersian(Math.round(getSubtotal() * (refillPercent / 100)).toLocaleString())} ت</span>
                    </div>
                  )}

                  {charityDonation > 0 && (
                    <div className="flex justify-between text-pink-400 font-bold">
                      <span>ردپای مهربانی</span>
                      <span className="font-vazir">{toPersian(charityDonation.toLocaleString())} تومان+</span>
                    </div>
                  )}

                  <div className="flex justify-between text-white/80">
                    <span>هزینه ارسال</span>
                    {shippingFee > 0 ? (
                      <span className="font-vazir text-white">{toPersian(shippingFee.toLocaleString())} تومان</span>
                    ) : (
                      <span className="text-emerald-400 font-bold">رایگان</span>
                    )}
                  </div>

                  <div className="flex justify-between items-center pt-3 border-t border-white/10">
                    <span className="text-sm font-black text-white">مبلغ قابل پرداخت:</span>
                    <div className="text-left">
                       <span className="text-2xl font-black text-canina-gold leading-none font-vazir">
                         {toPersian((getTotal() + shippingFee).toLocaleString())}
                       </span>
                       <span className="text-[10px] text-white/60 font-bold mr-1">تومان</span>
                    </div>
                  </div>
               </div>

               {/* Discount Code Input */}
               <div className="pt-1">
                  <form 
                    className="flex gap-2"
                    onSubmit={async (e) => {
                      e.preventDefault();
                      const code = (e.currentTarget.elements.namedItem('coupon') as HTMLInputElement).value;
                      const success = await useCartStore.getState().applyCoupon(code);
                      if (success) {
                        toast.success("کد تخفیف با موفقیت اعمال شد.");
                      } else {
                        toast.error("کد تخفیف نامعتبر است.");
                      }
                    }}
                  >
                     <input 
                       id="chk-coupon"
                       name="coupon"
                       type="text" 
                       autoComplete="off"
                       placeholder="کد تخفیف..."
                       className="flex-1 bg-white/10 border border-white/10 rounded-xl px-3 py-2 text-xs focus:ring-1 focus:ring-canina-blue outline-none text-white placeholder-white/40 font-mono"
                     />
                    <button type="submit" className="bg-white/15 px-3 py-2 rounded-xl text-xs font-bold hover:bg-white/25 transition-all cursor-pointer">اعمال</button>
                  </form>
               </div>

               {/* Submit Button */}
               <button 
                 onClick={handleFinalize}
                 disabled={loading}
                 className="w-full bg-canina-blue hover:bg-blue-600 text-white py-3.5 rounded-xl font-black text-sm transition-all shadow-md shadow-canina-blue/20 flex items-center justify-center gap-2 disabled:opacity-50 disabled:cursor-not-allowed cursor-pointer mt-2"
               >
                 {loading ? (
                    <>
                      <div className="w-4 h-4 border-2 border-white/20 border-t-white rounded-full animate-spin" />
                      در حال ثبت...
                    </>
                 ) : (
                    <>
                      <span>پرداخت و تکمیل سفارش</span>
                      <ArrowRight className="w-4 h-4 rotate-180" />
                    </>
                 )}
               </button>

               <div className="flex items-center justify-center gap-1.5 text-[10px] font-bold text-white/30 tracking-wide pt-1">
                  <ShieldCheck className="w-3.5 h-3.5 text-emerald-400" />
                  <span>تضمین امنیت پرداخت و اصالت کالا</span>
               </div>
            </div>
          </div>
        </div>
      </div>

      <TopUpModal 
        isOpen={showTopUpModal} 
        initialAmount={Math.max(0, (getTotal() + shippingFee) - (profile.walletBalance || 0))}
        onClose={() => setShowTopUpModal(false)} 
        onConfirm={(amt) => {
          useUserStore.setState(state => ({
            profile: {
              ...state.profile,
              walletBalance: (state.profile.walletBalance || 0) + amt
            }
          }));
        }} 
      />

      <AddressModal
        isOpen={showAddressModal}
        onClose={() => setShowAddressModal(false)}
        onSave={async (newAddr) => {
          try {
            await useUserStore.getState().addAddress(newAddr);
            const updatedProfile = useUserStore.getState().profile;
            if (updatedProfile.addresses && updatedProfile.addresses.length > 0) {
              setSelectedAddressId(updatedProfile.addresses[0].id);
            }
            setShowAddressModal(false);
          } catch (e) {
            console.error("Failed to add address", e);
          }
        }}
      />
    </div>
  );
}