"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
} 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';

export default function CheckoutPage() {
  const router = useRouter();
  const { items, getTotal, getSubtotal, isSubscribed, charityDonation, setCharityDonation, addOrder, clearCart } = useCartStore();
  const { 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 [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 shippingFee = Number(shippingFeeSetting) || 0;
  const subtotal = getSubtotal();
  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;
    setLoading(true);
    const activePet = getActivePet();

    try {
      // 1. Deduct wallet balance if payment method is wallet
      if (paymentMethod === 'wallet') {
        const walletDeducted = Math.min(profile.walletBalance || 0, totalAmount);
        if (walletDeducted > 0) {
          const newBalance = (profile.walletBalance || 0) - walletDeducted;
          const newTransaction = {
            id: `TR-${Math.floor(Math.random() * 90000) + 10000}`,
            type: 'purchase' as const,
            amount: walletDeducted,
            date: new Date().toISOString(),
            status: 'success' as const
          };
          useUserStore.setState((state) => ({
            profile: {
              ...state.profile,
              walletBalance: newBalance,
              transactions: [newTransaction, ...(state.profile.transactions || [])]
            }
          }));
        }
      }

      // 2. Register the order in the backend
      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)}` : ''})` : ''}`;
      }

      // Check wallet balance if payment method is wallet
      if (paymentMethod === 'wallet' && (profile.walletBalance || 0) < totalAmount) {
        toast.error(`موجودی کیف پول شما (${(profile.walletBalance || 0).toLocaleString('fa-IR')} تومان) کمتر از مبلغ نهایی سفارش (${totalAmount.toLocaleString('fa-IR')} تومان) است. لطفاً ابتدا کیف پول خود را شارژ کنید.`);
        setLoading(false);
        return;
      }

      // Check shipping address requirement
      if (!selectedAddressId && !manualAddress) {
        toast.error("لطفاً یک آدرس برای ارسال سفارش انتخاب کرده یا آدرس جدید وارد کنید.");
        setLoading(false);
        return;
      }

      const orderId = await addOrder({
        items: [...items],
        total: totalAmount,
        charityDonation: charityDonation,
        paymentMethod: paymentMethod,
        isRefill: isSubscribed,
        petId: activePet?.id,
        shippingAddress: shippingAddressStr
      });

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

      // 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) {
      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);
    }
  };

  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 py-12 px-6 font-vazir" dir="rtl">
      <div className="max-w-7xl mx-auto">
        
        {/* Mobile Navigation & Breadcrumbs */}
        <div className="lg:hidden mb-10 space-y-4">
          <button 
            onClick={() => router.back()}
            className="flex items-center gap-2 text-medical-gray-500 font-bold hover:text-canina-blue transition-colors"
          >
            <ChevronRight className="w-5 h-5" />
            <span>بازگشت به سبد خرید</span>
          </button>
          
          <div className="flex items-center gap-2 text-[10px] font-black text-medical-gray-400 uppercase tracking-widest overflow-x-auto whitespace-nowrap pb-2">
            <span className="cursor-pointer hover:text-canina-blue" onClick={() => router.push('/shop')}>سبد خرید</span>
            <ChevronLeft className="w-2.5 h-2.5" />
            <span className="text-canina-blue">نهایی‌سازی سفارش</span>
          </div>
        </div>

        {/* Desktop Breadcrumbs (Hidden on Mobile) */}
        <div className="hidden lg:flex items-center gap-2 text-[10px] font-black text-medical-gray-400 uppercase tracking-widest mb-10">
           <span className="cursor-pointer hover:text-canina-blue" onClick={() => router.push('/')}>خانه</span>
           <ChevronLeft className="w-2.5 h-2.5" />
           <span className="text-canina-blue">درگاه پرداخت امن و نهایی‌سازی</span>
        </div>

        <div className="grid lg:grid-cols-12 gap-8 lg:gap-12">
          {/* Main Form */}
          <div className="lg:col-span-8 space-y-6 sm:space-y-8">
            {/* Step 1: Shipping */}
            <section className="bg-white rounded-[2rem] sm:rounded-[3rem] border border-medical-gray-200 p-5 sm:p-10 overflow-hidden relative">
               <div className="absolute top-0 right-0 w-2.5 sm:w-3 h-full bg-canina-blue opacity-20" />
               <div className="flex items-center gap-3 sm:gap-4 mb-6 sm:mb-10">
                 <div className="w-10 h-10 sm:w-12 sm:h-12 bg-medical-gray-900 text-white rounded-2xl flex items-center justify-center font-black text-sm sm:text-base">۱</div>
                 <h2 className="text-xl sm:text-2xl font-black text-medical-gray-900 italic">اطلاعات ارسال</h2>
               </div>
               
               {isLoggedIn && profile.addresses && profile.addresses.length > 0 ? (
                 <div className="space-y-4">
                   <div className="flex items-center justify-between mb-2">
                     <p className="text-xs font-bold text-medical-gray-500">انتخاب آدرس جهت تحویل سفارش:</p>
                     <button
                       type="button"
                       onClick={() => setShowAddressModal(true)}
                       className="flex items-center gap-1.5 text-canina-blue font-black text-xs hover:underline bg-canina-blue/5 border border-canina-blue/20 px-3 py-1.5 rounded-xl transition-all"
                     >
                       <PlusCircle className="w-4 h-4" />
                       <span>+ افزودن آدرس جدید</span>
                     </button>
                   </div>
                   <div className="grid gap-3">
                     {profile.addresses.map((addr) => (
                       <div
                         key={addr.id}
                         onClick={() => setSelectedAddressId(addr.id)}
                         className={cn(
                           "p-4 rounded-2xl border-2 cursor-pointer transition-all flex items-start gap-3",
                           selectedAddressId === addr.id ? "border-canina-blue bg-canina-blue/5" : "border-medical-gray-100 hover:border-medical-gray-200"
                         )}
                       >
                         <input
                           type="radio"
                           name="selectedAddress"
                           checked={selectedAddressId === addr.id}
                           onChange={() => setSelectedAddressId(addr.id)}
                           className="mt-1"
                         />
                         <div className="flex-1 min-w-0">
                           <div className="flex items-center gap-2 mb-1">
                             <span className="font-black text-sm text-medical-gray-900">{addr.title}</span>
                             {addr.isDefault && (
                               <span className="bg-canina-blue/10 text-canina-blue text-[9px] font-black px-2 py-0.5 rounded-full">پیش‌فرض</span>
                             )}
                           </div>
                           <p className="text-xs text-medical-gray-600 leading-relaxed truncate">{addr.province}، {addr.city}، {addr.detail}</p>
                           <p className="text-[10px] text-medical-gray-400 font-bold mt-1">گیرنده: {addr.receptorName} | همراه: {toPersian(addr.phone)}</p>
                         </div>
                       </div>
                     ))}
                   </div>
                 </div>
               ) : (
                 <div className="space-y-4">
                   {isLoggedIn && (
                     <div className="flex justify-end mb-2">
                       <button
                         type="button"
                         onClick={() => setShowAddressModal(true)}
                         className="flex items-center gap-1.5 text-canina-blue font-black text-xs hover:underline bg-canina-blue/5 border border-canina-blue/20 px-3 py-1.5 rounded-xl transition-all"
                       >
                         <PlusCircle className="w-4 h-4" />
                         <span>افزودن و ذخیره آدرس جدید</span>
                       </button>
                     </div>
                   )}
                   <div className="grid md:grid-cols-2 gap-4 sm:gap-6">
                     <div className="space-y-2">
                       <label htmlFor="chk-fullname" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">نام و نام خانوادگی گیرنده *</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 border border-medical-gray-200 rounded-2xl py-3 sm:py-4 px-4 sm:px-6 text-xs sm:text-sm focus:outline-none focus:ring-2 focus:ring-canina-blue/20"
                         placeholder="مثلاً: پارسا آقایی"
                       />
                     </div>
                     <div className="space-y-2">
                       <label htmlFor="chk-tel" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">شماره تماس گیرنده *</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 border border-medical-gray-200 rounded-2xl py-3 sm:py-4 px-4 sm:px-6 text-xs sm:text-sm focus:outline-none focus:ring-2 focus:ring-canina-blue/20 dir-ltr text-right"
                         placeholder="۰۹۱۲XXXXXXX"
                       />
                     </div>
                     <div className="space-y-2">
                       <label htmlFor="chk-province" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">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 className="space-y-2">
                       <label htmlFor="chk-city" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">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 border border-medical-gray-200 rounded-2xl py-3 sm:py-4 px-4 sm:px-6 text-xs sm:text-sm focus:outline-none focus:ring-2 focus:ring-canina-blue/20"
                           placeholder="نام شهر..."
                         />
                       )}
                     </div>
                     <div className="md:col-span-2 space-y-2">
                       <label htmlFor="chk-street" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">آدرس دقیق پستی *</label>
                       <textarea
                         id="chk-street"
                         name="street-address"
                         autoComplete="street-address"
                         value={manualAddress}
                         onChange={(e) => setManualAddress(e.target.value)}
                         className="w-full bg-medical-gray-50 border border-medical-gray-200 rounded-2xl py-3 sm:py-4 px-4 sm:px-6 text-xs sm:text-sm focus:outline-none focus:ring-2 focus:ring-canina-blue/20 h-24 sm:h-28"
                         placeholder="خیابان، کوچه، پلاک، واحد..."
                       />
                     </div>
                     <div className="md:col-span-2 space-y-2">
                       <label htmlFor="chk-zipcode" className="text-[10px] font-black text-medical-gray-400 uppercase tracking-widest block">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 border border-medical-gray-200 rounded-2xl py-3 sm:py-4 px-4 sm:px-6 text-xs sm:text-sm focus:outline-none focus:ring-2 focus:ring-canina-blue/20 dir-ltr text-right"
                         placeholder="۱۲۳۴۵۶۷۸۹۰"
                       />
                     </div>
                   </div>
                 </div>
               )}
            </section>

            {/* Step 2: Payment */}
            <section className="bg-white rounded-[2rem] sm:rounded-[3rem] border border-medical-gray-200 p-5 sm:p-10 overflow-hidden relative">
               <div className="absolute top-0 right-0 w-2.5 sm:w-3 h-full bg-medical-gray-900 opacity-20" />
               <div className="flex items-center gap-3 sm:gap-4 mb-6 sm:mb-10">
                 <div className="w-10 h-10 sm:w-12 sm:h-12 bg-medical-gray-900 text-white rounded-2xl flex items-center justify-center font-black text-sm sm:text-base">۲</div>
                 <h2 className="text-xl sm:text-2xl font-black text-medical-gray-900 italic">شیوه پرداخت</h2>
               </div>

                 <div className="grid grid-cols-1 sm:grid-cols-2 gap-3 sm:gap-4">
                    {(() => {
                      const getText = useSettingsStore.getState().getText;
                      const allGateways = [
                        { 
                          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 sm:w-6 sm:h-6" />,
                          enabled: getText('PAY_GATEWAY_CARD_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 sm:w-6 sm:h-6" />,
                          enabled: getText('PAY_GATEWAY_WALLET_ENABLE', 'true') === 'true'
                        },
                        { 
                          id: 'online', 
                          label: getText('PAY_GATEWAY_ONLINE_LABEL', 'درگاه پرداخت آنلاین (شتاب)'), 
                          desc: getText('PAY_GATEWAY_ONLINE_DESC', 'پرداخت مستقیم با کلیه کارت‌های شتاب'), 
                          icon: <ShieldCheck className="w-5 h-5 sm:w-6 sm:h-6" />,
                          enabled: getText('PAY_GATEWAY_ONLINE_ENABLE', 'false') === 'true'
                        },
                        { 
                          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 sm:w-6 sm:h-6" />,
                          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-4 sm:p-6 rounded-2xl sm:rounded-3xl border-2 transition-all group flex sm:flex-col items-center sm:items-start gap-4 sm:gap-0 relative",
                            pay.enabled 
                              ? (paymentMethod === pay.id ? "border-canina-blue bg-canina-blue/5 cursor-pointer" : "border-medical-gray-100 hover:border-canina-blue cursor-pointer")
                              : "border-medical-gray-100 bg-medical-gray-50/60 opacity-60 cursor-not-allowed"
                          )}
                        >
                           <div className="w-10 h-10 sm:w-12 sm:h-12 bg-medical-gray-50 rounded-xl sm:rounded-2xl flex items-center justify-center text-medical-gray-400 group-hover:text-canina-blue group-hover:bg-canina-blue/10 sm:mb-4 transition-all flex-shrink-0">
                              {pay.icon}
                           </div>
                           <div className="min-w-0 flex-1 w-full">
                             <div className="flex items-center justify-between gap-2 mb-0.5 sm:mb-1">
                               <h4 className="font-black text-xs sm:text-sm text-medical-gray-900 truncate">{pay.label}</h4>
                               {!pay.enabled && (
                                 <span className="text-[9px] font-black bg-amber-100 text-amber-800 px-2 py-0.5 rounded-full shrink-0 font-vazir">
                                   به زودی
                                 </span>
                               )}
                             </div>
                             <div className="flex items-center justify-between gap-2">
                               <p className={cn("text-[10px] font-bold truncate", pay.id === 'wallet' ? "text-canina-blue" : "text-medical-gray-400")}>{pay.desc}</p>
                               {pay.id === 'wallet' && pay.enabled && (profile.walletBalance || 0) === 0 && (
                                 <button 
                                   type="button" 
                                   onClick={(e) => {
                                     e.stopPropagation();
                                     setShowTopUpModal(true);
                                   }}
                                   className="text-[10px] bg-canina-blue text-white px-2 py-0.5 rounded-lg font-bold hover:bg-blue-700 transition-colors flex items-center gap-1 shrink-0 font-vazir"
                                 >
                                   <PlusCircle className="w-3 h-3" />
                                   <span>افزایش موجودی</span>
                                 </button>
                               )}
                             </div>
                           </div>
                        </div>
                      ));
                    })()}
                 </div>

                {paymentMethod === 'card' && (
                  <div className="mt-6 bg-blue-50/80 border border-blue-200 rounded-2xl p-5 space-y-3 font-vazir">
                    <div className="flex items-center gap-2 text-canina-blue font-bold text-sm">
                      <CreditCard className="w-5 h-5" />
                      <span>اطلاعات کارت جهت واریز وجه سفارش:</span>
                    </div>
                    <div className="grid grid-cols-1 md:grid-cols-2 gap-4 text-xs bg-white p-4 rounded-xl border border-blue-100 shadow-sm">
                      
                      {/* Card Number Box */}
                      <div className="bg-gray-50/80 p-3 rounded-xl border border-gray-200/60 flex items-center justify-between group hover:border-canina-blue transition-all">
                        <div className="space-y-1">
                          <span className="text-[11px] text-gray-500 font-bold block">شماره کارت (بانک سامان):</span>
                          <span 
                            onClick={() => handleCopy("6219861974012071", "شماره کارت")}
                            className="font-mono text-sm sm:text-base font-extrabold text-gray-900 tracking-wider dir-ltr block cursor-pointer hover:text-canina-blue transition-colors"
                          >
                            6219 - 8619 - 7401 - 2071
                          </span>
                        </div>
                        <button 
                          type="button" 
                          onClick={() => handleCopy("6219861974012071", "شماره کارت")}
                          className="p-2 rounded-lg bg-white border border-gray-200 text-gray-500 hover:text-canina-blue hover:border-canina-blue transition-all"
                          title="کپی شماره کارت"
                        >
                          <Copy className="w-4 h-4" />
                        </button>
                      </div>

                      {/* Sheba Box */}
                      <div className="bg-gray-50/80 p-3 rounded-xl border border-gray-200/60 flex items-center justify-between group hover:border-canina-blue transition-all">
                        <div className="space-y-1">
                          <span className="text-[11px] text-gray-500 font-bold block">شماره شبا:</span>
                          <span 
                            onClick={() => handleCopy("IR650560611828005725101501", "شماره شبا")}
                            className="font-mono text-xs sm:text-sm font-extrabold text-gray-900 tracking-wider dir-ltr block cursor-pointer hover:text-canina-blue transition-colors"
                          >
                            IR-65 0560 6118 2800 5725 1015 01
                          </span>
                        </div>
                        <button 
                          type="button" 
                          onClick={() => handleCopy("IR650560611828005725101501", "شماره شبا")}
                          className="p-2 rounded-lg bg-white border border-gray-200 text-gray-500 hover:text-canina-blue hover:border-canina-blue transition-all"
                          title="کپی شماره شبا"
                        >
                          <Copy className="w-4 h-4" />
                        </button>
                      </div>

                      <div className="md:col-span-2 pt-2 border-t border-gray-100 flex flex-col sm:flex-row items-start sm:items-center justify-between gap-2 text-gray-700 font-bold">
                        <span className="text-xs">به نام: <strong className="text-gray-900">پارسا آقایی</strong></span>
                        <span className="text-canina-blue text-[11px]">پس از ثبت سفارش، کارشناسان فروش جهت تایید فیش با شما تماس می‌گیرند.</span>
                      </div>
                    </div>
                  </div>
                )}
            </section>

            {/* Step 3: Charity Section */}
            <section className="bg-white rounded-[2rem] sm:rounded-[3rem] border border-medical-gray-200 p-5 sm:p-10 overflow-hidden relative">
               <div className="absolute top-0 right-0 w-2.5 sm:w-3 h-full bg-pink-500 opacity-20" />
               <div className="flex items-center justify-between mb-6 sm:mb-8">
                 <div className="flex items-center gap-3 sm:gap-4">
                   <div className="w-10 h-10 sm:w-12 sm:h-12 bg-pink-500 text-white rounded-2xl flex items-center justify-center flex-shrink-0">
                     <Heart className="w-5 h-5 sm:w-6 sm:h-6 fill-white" />
                   </div>
                   <div>
                     <h2 className="text-xl sm:text-2xl font-black text-medical-gray-900 italic">ردپای مهربانی</h2>
                     <p className="text-[10px] sm:text-xs font-bold text-pink-500 mt-0.5">سهم شما در حمایت از حیوانات بی‌پناه</p>
                   </div>
                 </div>
               </div>

               <div className="bg-pink-50 rounded-[2rem] sm:rounded-[2.5rem] p-5 sm:p-8 border border-pink-100">
                  <div className="flex flex-col sm:flex-row items-start sm:items-center justify-between gap-4 sm:gap-6">
                    <div className="flex-1">
                      <h4 className="text-base sm:text-lg font-black text-medical-gray-900 italic mb-1 sm:mb-2">رند کردن مبلغ و کمک به پناهگاه</h4>
                      <p className="text-xs sm:text-sm text-medical-gray-600 leading-relaxed font-medium"> مابقی مبلغ تا {toPersian(roundStep.toLocaleString())} تومان بعدی صرف تامین غذا و دارو برای حیوانات بی‌سرپرست می‌شود.</p>
                    </div>
                    
                    <button 
                      onClick={handleCharityToggle}
                      className={cn(
                        "w-14 h-14 sm:w-20 sm:h-20 rounded-full flex items-center justify-center transition-all shadow-lg self-end sm:self-center",
                        useRoundUp ? "bg-pink-500 text-white shadow-pink-200" : "bg-white text-medical-gray-300 border-2 border-medical-gray-100"
                      )}
                    >
                      <PlusCircle className={cn("w-7 h-7 sm:w-10 sm:h-10", useRoundUp ? "rotate-45" : "rotate-0")} />
                    </button>
                  </div>
               </div>
                   {useRoundUp && (
                     <motion.div 
                       initial={{ opacity: 0, y: 10 }}
                       animate={{ opacity: 1, y: 0 }}
                       className="mt-6 pt-6 border-t border-pink-100 flex items-center justify-between"
                     >
                       <span className="text-sm font-black text-pink-600 italic">مبلغ اهدایی شما:</span>
                       <span className="text-lg font-black font-vazir text-pink-500">{toPersian(charityDonation.toLocaleString())} تومان</span>
                     </motion.div>
                   )}
                
                <p className="mt-6 text-[10px] text-center text-medical-gray-400 font-bold">«با خرید این محصول، شما هم در درمان یک حیوان پناهگاهی سهیم شدید.»</p>
             </section>
          </div>

          {/* Sidebar Summary */}
          <div className="lg:col-span-4 space-y-8">
            <div className="bg-medical-gray-900 rounded-[3rem] p-10 text-white shadow-2xl sticky top-32">
               <h3 className="text-2xl font-black italic mb-8 border-b border-white/20 pb-4 text-white">خلاصه سفارش</h3>
               
               <div className="space-y-6 mb-10 overflow-y-auto max-h-60 pr-2">
                 {items.map((item) => (
                   <div key={item.product.id} className="flex justify-between items-start gap-4">
                      <div className="flex-1">
                        <p className="text-sm font-black text-white leading-tight">{item.product.name}</p>
                        <p className="text-[10px] text-white/60 font-bold mt-1">تعداد: {toPersian(item.quantity)} بسته</p>
                      </div>
                      <span className="text-xs font-mono font-bold font-vazir text-white">{toPersian((item.product.priceValue * item.quantity).toLocaleString())} تومان</span>
                   </div>
                 ))}
               </div>

               <div className="space-y-4 pt-8 border-t border-white/20">
                  <div className="flex justify-between text-sm font-bold text-white/80">
                    <span>مجموع اقلام</span>
                    <span className="font-vazir text-white">{toPersian(getSubtotal().toLocaleString())} تومان</span>
                  </div>
                  {isSubscribed && (
                    <div className="flex justify-between text-xs font-bold text-green-400 bg-green-500/10 p-2.5 rounded-xl border border-green-500/20">
                      <span>رزرو هوشمند تمدید (پاداش ۵٪ خرید بعدی):</span>
                      <span className="font-vazir font-black text-green-400">رزرو شد ({toPersian(Math.round(getSubtotal() * 0.05).toLocaleString())} تومان)</span>
                    </div>
                  )}
                  {charityDonation > 0 && (
                    <div className="flex justify-between text-sm font-bold text-pink-400">
                      <span>ردپای مهربانی</span>
                      <span className="font-vazir text-pink-400">{toPersian(charityDonation.toLocaleString())} تومان+</span>
                    </div>
                  )}
                  <div className="flex justify-between text-sm font-bold text-white/80">
                    <span>هزینه ارسال</span>
                    {shippingFee > 0 ? (
                      <span className="font-vazir font-bold text-white">{toPersian(shippingFee.toLocaleString())} تومان</span>
                    ) : (
                      <span className="text-green-400 uppercase tracking-widest text-[10px] font-black">رایگان</span>
                    )}
                  </div>
                  <div className="flex justify-between items-end pt-4">
                    <span className="text-xl font-black italic text-white">مبلغ نهایی</span>
                    <div className="text-left">
                       <p className="text-3xl font-black text-canina-gold leading-none font-vazir">{toPersian((getTotal() + shippingFee).toLocaleString())}</p>
                       <p className="text-[10px] text-white/50 font-bold mt-1">تومان</p>
                    </div>
                  </div>
               </div>

                {/* Discount Code */}
               <div className="mt-8 pt-8 border-t border-white/10">
                  <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("تبریک! کد تخفیف با موفقیت اعمال شد.");
                      } else {
                        toast.error("کد تخفیف معتبر نیست.");
                      }
                    }}
                  >
                     <input 
                       id="chk-coupon"
                       name="coupon"
                       type="text" 
                       autoComplete="off"
                       placeholder="کد تخفیف (مثلاً: CANINO2024)"
                       className="flex-1 bg-white/5 border border-white/10 rounded-xl px-4 py-3 text-xs focus:ring-1 focus:ring-canina-blue outline-none"
                     />
                    <button type="submit" className="bg-white/10 px-4 py-3 rounded-xl text-[10px] font-black uppercase tracking-widest hover:bg-white/20 transition-all">اعمال</button>
                  </form>
               </div>

               {/* Refill Estimates */}
               <div className="mt-10 p-6 bg-white/5 rounded-3xl border border-white/10 space-y-4">
                 <div className="flex items-center gap-3">
                   <Clock className="w-5 h-5 text-canina-blue" />
                   <h4 className="text-xs font-black uppercase tracking-widest font-vazir">تخمین اتمام مصرف (هوش مصنوعی)</h4>
                 </div>
                 <div className="space-y-2">
                    {items.map(item => {
                      const activePet = usePetStore.getState().getActivePet();
                      // Re-hydrate product to ensure methods like calculateDosage exist from static config
                      const staticProduct = PRODUCTS.find(p => p.id === item.product.id || p.artNo === item.product.artNo);
                      const calculateFn = staticProduct?.calculateDosage || item.product.calculateDosage;
                      
                      const dose = activePet && typeof calculateFn === 'function' 
                        ? calculateFn(activePet.weight, activePet.age <= 1) 
                        : { quantity: 1 };
                        
                      const days = Math.floor((staticProduct?.packageSize || item.product.packageSize || 50) / (dose.quantity || 1));
                      
                      return (
                        <div key={item.product.id} className="flex items-center justify-between text-[10px] font-medium font-vazir">
                           <span className="text-white/40">{item.product.name}</span>
                           <span className="text-canina-blue">~ {toPersian(days)} روز دیگر</span>
                        </div>
                      );
                    })}
                 </div>
               </div>

               <button 
                 onClick={handleFinalize}
                 disabled={loading}
                 className="w-full bg-canina-blue text-white py-6 rounded-2xl font-black text-xl mt-10 hover:scale-[1.02] transition-all shadow-xl shadow-canina-blue/20 flex items-center justify-center gap-3 disabled:opacity-50 disabled:cursor-not-allowed"
               >
                 {loading ? (
                    <>
                      <div className="w-6 h-6 border-4 border-white/20 border-t-white rounded-full animate-spin" />
                      در حال ثبت...
                    </>
                 ) : (
                    <>
                       پرداخت و تکمیل سفارش
                      <ArrowRight className="w-6 h-6 rotate-180" />
                    </>
                 )}
               </button>

               <div className="mt-6 flex items-center justify-center gap-2 text-[10px] font-black text-white/20 tracking-widest uppercase">
                  <ShieldCheck className="w-4 h-4" />
                  تضمین امنیت تراکنش بانکی
               </div>
            </div>
          </div>
        </div>
      </div>

      <TopUpModal 
        isOpen={showTopUpModal} 
        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>
  );
}