"use client";
import React, { useState, useEffect } from "react";
import { X, Trash2, Plus, Minus, ShoppingBag, ShieldCheck, ArrowLeft, Ticket, Sparkles, CheckCircle2 } from "lucide-react";
import { motion, AnimatePresence } from "motion/react";
import { toPersian } from "../lib/utils";
import { useCartStore } from "../lib/store/cartStore";
import { Product } from "../lib/data/products";
import { productService } from "../lib/services/productService";
import SafeImage from "./SafeImage";
import { useUserStore } from "../lib/store/userStore";
import { useSettingsStore } from "../lib/store/settingsStore";
import { useCatalogMode } from "../lib/useCatalogMode";
import AuthModal from "./AuthModal";
import DeleteConfirmModal from "./DeleteConfirmModal";
import { toast } from "sonner";

export default function CartDrawer({ isOpen, onClose, onCheckout, onShopNavigate }: { 
  isOpen: boolean; 
  onClose: () => void; 
  onCheckout: () => void;
  onShopNavigate?: () => void;
}) {
  const { items, updateQuantity, removeItem, isSubscribed, toggleSubscription, getTotal, getSubtotal, getDiscount, coupon, applyCoupon, addItem } = useCartStore();
  const { isLoggedIn } = useUserStore();
  const { showPrices } = useCatalogMode();
  const isRefillEnabled = useSettingsStore((state) => state.getText('REFILL_SUBSCRIPTION_ENABLED', 'false') === 'true');
  const refillPercent = useSettingsStore((state) => state.getText('REFILL_REWARD_PERCENT', '5'));
  const [isAuthModalOpen, setIsAuthModalOpen] = useState(false);
  const [couponCode, setCouponCode] = useState("");
  const [couponStatus, setCouponStatus] = useState<"idle" | "success" | "error">("idle");
  const [deleteConfirmId, setDeleteConfirmId] = useState<string | null>(null);

  const handleApplyCoupon = async () => {
    const success = await applyCoupon(couponCode);
    if (success) {
      setCouponStatus("success");
      setTimeout(() => setCouponStatus("idle"), 3000);
    } else {
      setCouponStatus("error");
      setTimeout(() => setCouponStatus("idle"), 2000);
    }
  };

  // Smart Cross-sell Logic
  const hasCanhydrox = items.some(i => i.product.id === 'canhydrox-gag');
  const hasLachsOl = items.some(i => i.product.id === 'lachs-ol');
  const [suggestedProduct, setSuggestedProduct] = useState<Product | null>(null);

  useEffect(() => {
    if (!hasLachsOl && hasCanhydrox) {
      productService.getProducts({ limit: 999 }).then(({ data: prods }) => {
        const found = prods.find(p => p.id === 'lachs-ol' || p.artNo === 'lachs-ol');
        setSuggestedProduct(found || null);
      });
    } else {
      Promise.resolve().then(() => setSuggestedProduct(null));
    }
  }, [hasLachsOl, hasCanhydrox]);

  // Lock background body scroll and handle browser back button to close drawer
  useEffect(() => {
    if (isOpen) {
      document.body.style.overflow = "hidden";
      if (typeof window !== "undefined") {
        window.history.pushState({ modal: "cart_drawer" }, "");
      }
    } else {
      document.body.style.overflow = "unset";
    }

    const handlePopState = () => {
      if (isOpen) {
        onClose();
      }
    };

    window.addEventListener("popstate", handlePopState);

    return () => {
      document.body.style.overflow = "unset";
      window.removeEventListener("popstate", handlePopState);
    };
  }, [isOpen, onClose]);
    
  return (
    <AnimatePresence>
      {isOpen && (
        <>
          <motion.div
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            onClick={onClose}
            className="fixed inset-0 bg-medical-gray-900/40 backdrop-blur-sm z-[100]"
          />
          <motion.div
            initial={{ x: "100%" }}
            animate={{ x: 0 }}
            exit={{ x: "100%" }}
            transition={{ type: "spring", damping: 25, stiffness: 200 }}
            className="fixed inset-y-0 right-0 w-full max-w-md bg-white shadow-2xl z-[101] flex flex-col"
            dir="rtl"
          >
            {/* Header */}
            <div className="p-6 border-b border-medical-gray-100 flex items-center justify-between">
              <div className="flex items-center gap-3">
                <div className="w-10 h-10 bg-medical-gray-50 rounded-xl flex items-center justify-center text-canina-blue">
                   <ShoppingBag className="w-6 h-6" />
                </div>
                <h3 className="text-xl font-black text-medical-gray-900 italic">سبد خرید</h3>
              </div>
              <button onClick={onClose} className="p-2 hover:bg-medical-gray-50 rounded-full transition-colors">
                <X className="w-6 h-6 text-medical-gray-400" />
              </button>
            </div>

            {/* Content */}
            <div className="flex-1 overflow-y-auto p-6 space-y-6">
              {items.length === 0 ? (
                <div className="h-full flex flex-col items-center justify-center text-center space-y-4">
                  <div className="w-20 h-20 bg-medical-gray-50 rounded-full flex items-center justify-center text-medical-gray-300">
                    <ShoppingBag className="w-10 h-10" />
                  </div>
                  <p className="text-medical-gray-500 font-bold">سبد خرید شما خالی است</p>
                  <button 
                    onClick={() => {
                        onClose();
                        onShopNavigate?.();
                    }}
                    className="text-canina-blue font-black text-sm border-b-2 border-canina-blue pb-1 font-vazir"
                  >
                    مشاهده محصولات تخصصی
                  </button>
                </div>
              ) : (
                <>
                  <div className="space-y-4">
                    {items.map((item) => (
                      <div key={item.product.id} className="flex gap-4 p-4 bg-medical-gray-50 rounded-3xl border border-medical-gray-100 group">
                        <div className="w-20 h-20 bg-white rounded-2xl p-2 flex-shrink-0 flex items-center justify-center shadow-sm">
                          <SafeImage src={item.product.image} alt={item.product.nameFa || item.product.name} className="w-full h-full" imgClassName="object-contain" />
                        </div>
                        <div className="flex-1 min-w-0">
                          <h4 className="text-sm font-black text-medical-gray-900 truncate mb-1">{item.product.nameFa || item.product.name}</h4>
                          <p className="text-[10px] text-canina-blue font-bold mb-3">{item.product.category}</p>
                          <div className="flex items-center justify-between">
                            <div className="flex items-center gap-2 bg-white rounded-lg border border-medical-gray-200 p-1">
                              <button 
                                onClick={() => updateQuantity(item.product.id, item.quantity - 1)}
                                className="p-1 hover:text-canina-blue transition-colors"
                                data-testid="minus-btn"
                              >
                                <Minus className="w-3 h-3" />
                              </button>
                              <span data-testid="cart-item-quantity" className="text-xs font-black min-w-[20px] text-center font-vazir">{toPersian(item.quantity)}</span>
                              <button 
                                onClick={() => updateQuantity(item.product.id, item.quantity + 1)}
                                className="p-1 hover:text-canina-blue transition-colors"
                                data-testid="plus-btn"
                              >
                                <Plus className="w-3 h-3" />
                              </button>
                            </div>
                            <button 
                              data-testid="cart-item-delete-btn"
                              onClick={() => setDeleteConfirmId(item.product.id)}
                              className="text-medical-gray-300 hover:text-red-500 transition-colors"
                            >
                              <Trash2 className="w-4 h-4" />
                            </button>
                          </div>
                        </div>
                        {showPrices && (
                          <div className="text-left flex flex-col justify-between items-end">
                             <span className="text-xs font-black text-medical-gray-900 font-vazir">{toPersian((item.product.priceValue * item.quantity).toLocaleString())}</span>
                             <span className="text-[10px] text-medical-gray-400 font-bold">تومان</span>
                          </div>
                        )}
                        
                        {/* Delete Confirmation Overlay */}
                        <AnimatePresence>
                          {deleteConfirmId === item.product.id && (
                            <motion.div 
                              initial={{ opacity: 0 }}
                              animate={{ opacity: 1 }}
                              exit={{ opacity: 0 }}
                              className="absolute inset-0 bg-white/95 z-40 flex flex-col items-center justify-center p-4 text-center rounded-3xl"
                            >
                               <div className="w-10 h-10 bg-red-50 rounded-full flex items-center justify-center text-red-500 mb-2">
                                 <Trash2 className="w-5 h-5" />
                               </div>
                               <p className="text-[11px] font-black text-medical-gray-900 mb-3 font-vazir">
                                 مطمئنی می‌خوای این محصول رو حذف کنی؟
                               </p>
                               <div className="flex gap-2 w-full px-2">
                                 <button 
                                   onClick={() => {
                                     removeItem(item.product.id);
                                     setDeleteConfirmId(null);
                                     toast.error(`${item.product.name} حذف شد`);
                                   }}
                                   className="flex-1 bg-red-500 text-white py-2 rounded-xl text-[10px] font-black shadow-lg shadow-red-500/20"
                                 >
                                   حذف
                                 </button>
                                 <button 
                                   onClick={() => setDeleteConfirmId(null)}
                                   className="flex-1 bg-medical-gray-100 text-medical-gray-600 py-2 rounded-xl text-[10px] font-black"
                                 >
                                   لغو
                                 </button>
                               </div>
                            </motion.div>
                          )}
                        </AnimatePresence>
                      </div>
                    ))}
                  </div>

                  {/* Smart Cross-sell Recommendation */}
                  {suggestedProduct && (
                    <motion.div 
                      initial={{ opacity: 0, y: 20 }}
                      animate={{ opacity: 1, y: 0 }}
                      className="p-5 bg-gradient-to-br from-canina-blue/5 to-transparent border border-canina-blue/10 rounded-3xl"
                    >
                      <div className="flex items-center gap-2 mb-4">
                        <Sparkles className="w-4 h-4 text-canina-blue animate-pulse" />
                        <span className="text-xs font-black text-medical-gray-900">پیشنهاد هوشمند برای جذب بهتر</span>
                      </div>
                      <div className="flex items-center gap-4">
                        <div className="w-16 h-16 bg-white rounded-2xl p-2 shrink-0 shadow-sm border border-canina-blue/5">
                           <SafeImage src={suggestedProduct.image} alt="" className="w-full h-full" imgClassName="object-contain" />
                        </div>
                        <div className="flex-1">
                           <h5 className="text-[10px] font-black text-medical-gray-900 mb-1">{suggestedProduct.name}</h5>
                           <p className="text-[9px] text-medical-gray-500 font-medium leading-tight">برای جذب ویتامین‌های Canhydrox، اسیدهای چرب سالمون ضروری هستند.</p>
                        </div>
                        <button 
                          onClick={() => addItem(suggestedProduct, 1)}
                          className="bg-canina-blue text-white w-8 h-8 rounded-full flex items-center justify-center hover:scale-110 transition-transform shadow-lg shadow-canina-blue/20"
                        >
                          <Plus className="w-4 h-4" />
                        </button>
                      </div>
                    </motion.div>
                  )}
                </>
              )}
            </div>

            {/* Footer */}
            {items.length > 0 && (
              <div className="p-6 bg-medical-gray-50 border-t border-medical-gray-200 space-y-6">
                {/* Discount Code (Only when prices are active) */}
                {showPrices && (
                  <div className="space-y-3">
                    <div className="flex items-center gap-2 text-[10px] font-black text-medical-gray-400 uppercase tracking-widest px-2">
                      <Ticket className="w-3 h-3" />
                      کد تخفیف اختصاصی
                    </div>
                    <div className="relative">
                      <input 
                        type="text" 
                        placeholder="CANINO2024"
                        value={couponCode}
                        onChange={(e) => setCouponCode(e.target.value)}
                        className={`w-full bg-white border ${couponStatus === 'error' ? 'border-red-300' : 'border-medical-gray-200'} rounded-2xl py-3 px-4 pr-10 text-sm font-bold focus:outline-none focus:ring-2 focus:ring-canina-blue/20 transition-all`}
                      />
                      <button 
                        onClick={handleApplyCoupon}
                        className={`absolute left-2 top-1/2 -translate-y-1/2 px-4 py-1.5 rounded-xl text-[10px] font-black transition-all ${couponStatus === 'success' ? 'bg-green-600 text-white' : 'bg-medical-gray-900 text-white hover:bg-canina-blue'}`}
                      >
                        {couponStatus === 'success' ? <CheckCircle2 className="w-3 h-3" /> : 'اعمال'}
                      </button>
                    </div>
                    {coupon && (
                      <div className="flex items-center justify-between p-3 bg-green-50 border border-green-100 rounded-2xl">
                        <div className="flex items-center gap-2 text-[10px] font-bold text-green-600">
                          <div className="w-1.5 h-1.5 rounded-full bg-green-600 animate-pulse" />
                          کد {coupon.code} ({(coupon.discount < 1 ? coupon.discount * 100 : coupon.discount)} {coupon.discount < 1 ? '٪' : 'تومان'}) اعمال شد
                        </div>
                        <button 
                          onClick={() => {
                            useCartStore.getState().removeCoupon();
                            setCouponCode("");
                          }}
                          className="p-1 hover:bg-red-50 hover:text-red-500 text-medical-gray-400 rounded-lg transition-all"
                        >
                           <Trash2 className="w-3.5 h-3.5" />
                        </button>
                      </div>
                    )}
                  </div>
                )}

                {/* Subscription Toggle */}
                {showPrices && isRefillEnabled && (
                  <div 
                    onClick={() => {
                      if (!isLoggedIn && !isSubscribed) {
                        toast.info("برای فعال‌سازی سرویس تمدید خودکار و دریافت یادآورها، لطفاً ابتدا وارد حساب کاربری خود شوید.");
                        setIsAuthModalOpen(true);
                        return;
                      }
                      toggleSubscription();
                    }}
                    className={`p-4 rounded-2xl border-2 transition-all cursor-pointer ${isSubscribed ? 'bg-canina-blue/5 border-canina-blue' : 'bg-white border-medical-gray-100 hover:border-canina-blue/30'}`}
                  >
                    <div className="flex items-center gap-3">
                      <div className={`w-10 h-10 rounded-xl flex items-center justify-center transition-colors ${isSubscribed ? 'bg-canina-blue text-white' : 'bg-medical-gray-50 text-medical-gray-300'}`}>
                        <ShieldCheck className="w-6 h-6" />
                      </div>
                      <div className="flex-1">
                        <h5 className="text-xs font-black text-medical-gray-900">سامانه تمدید هوشمند و {toPersian(refillPercent)}٪ پاداش Cashback</h5>
                        <p className="text-[10px] text-canina-blue font-black mt-0.5">{toPersian(refillPercent)}٪ شارژ هدیه کیف پول روی خرید تمدید بعدی همین محصول + ارسال اولویت‌دار</p>
                        <p className="text-[9px] text-medical-gray-500 font-bold mt-1">برنامه هوشمند وفاداری — یادآوری دقیق زمان اتمام مکمل پت بر اساس دوز دامپزشک + {toPersian(refillPercent)}٪ اعتبار هدیه بازگشت وجه</p>
                      </div>
                      <div className={`w-5 h-5 rounded-full border-2 flex items-center justify-center ${isSubscribed ? 'bg-canina-blue border-canina-blue' : 'border-medical-gray-200'}`}>
                        {isSubscribed && <X className="w-3 h-3 text-white" />}
                      </div>
                    </div>
                  </div>
                )}

                {/* Official Germany Catalog Authenticity Guarantee Banner */}
                <div className="p-3.5 bg-amber-50/80 border border-amber-200/80 rounded-2xl flex items-center justify-between gap-3 text-amber-900">
                  <div className="flex items-center gap-2.5">
                    <ShieldCheck className="w-5 h-5 text-amber-600 flex-shrink-0" />
                    <div>
                      <span className="text-xs font-black block">ضمانت اصالت کاتالوگ آلمان</span>
                      <span className="text-[10px] text-amber-700 font-bold block">واردات مستقیم دارویی • مشاوره رایگان قبل خرید</span>
                    </div>
                  </div>
                  <a
                    href={useSettingsStore.getState().getText('contact_phone_link', `tel:${useSettingsStore.getState().getText('contact_phone', '02188884444').replace(/[^0-9+]/g, '')}`)}
                    className="px-3 py-1.5 bg-amber-600 text-white rounded-xl text-[10px] font-black hover:bg-amber-700 transition-colors whitespace-nowrap shadow-xs font-vazir"
                  >
                    تماس فوری ({useSettingsStore.getState().getText('contact_phone', '۰۲۱-۸۸۸۸۴۴۴۴')})
                  </a>
                </div>

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

                {showPrices ? (
                  <div className="space-y-2">
                    <div className="flex items-center justify-between text-sm px-2">
                      <span className="text-medical-gray-500 font-bold">مجموع اقلام</span>
                      <span className="text-medical-gray-900 font-black font-vazir">{toPersian(getSubtotal().toLocaleString())} تومان</span>
                    </div>
                    {getDiscount() > 0 && (
                      <div className="flex items-center justify-between text-sm text-green-600 px-2 font-black">
                        <span className="font-bold">مجموع تخفیف‌ها</span>
                        <span className="font-black font-vazir">-{toPersian(getDiscount().toLocaleString())} تومان</span>
                      </div>
                    )}
                    <div className="flex items-center justify-between border-t border-medical-gray-200 pt-4 px-2">
                      <span className="text-lg font-black text-medical-gray-900 italic">مجموع قابل پرداخت</span>
                      <div className="text-left">
                         <p data-testid="cart-total-price" className="text-2xl font-black text-canina-blue tracking-tighter leading-none font-vazir">{toPersian(getTotal().toLocaleString())}</p>
                         <p className="text-[10px] text-medical-gray-400 font-bold">تومان</p>
                      </div>
                    </div>
                  </div>
                ) : (
                  <div className="bg-white border border-medical-gray-200 rounded-2xl p-4 flex items-center justify-between">
                    <span className="text-xs font-black text-medical-gray-700 font-vazir">تعداد کل اقلام انتخابی</span>
                    <span className="text-sm font-black text-canina-blue font-vazir">
                      {toPersian(items.reduce((acc, curr) => acc + curr.quantity, 0))} قلم کالا
                    </span>
                  </div>
                )}

                <button 
                  onClick={onCheckout}
                  className="w-full bg-canina-blue text-white py-5 rounded-[2.5rem] font-black text-lg hover:shadow-2xl hover:shadow-canina-blue/20 transition-all flex items-center justify-center gap-3 group"
                >
                  ثبت نهایی و تسویه حساب
                  <ArrowLeft className="w-5 h-5 group-hover:translate-x-[-4px] transition-transform" />
                </button>
              </div>
            )}
          </motion.div>

          <DeleteConfirmModal
            isOpen={Boolean(deleteConfirmId)}
            onClose={() => setDeleteConfirmId(null)}
            onConfirm={() => {
              if (deleteConfirmId) {
                removeItem(deleteConfirmId);
                setDeleteConfirmId(null);
                toast.success("محصول از سبد خرید حذف شد");
              }
            }}
            title="حذف از سبد خرید"
            message="آیا از حذف این مکمل دارویی از سبد خرید خود اطمینان دارید؟"
          />
        </>
      )}
    </AnimatePresence>
  );
}