'use client';

import { useState } from 'react';
import Link from 'next/link';
import { MessageCircle } from 'lucide-react';
import {
  buildDeliveryInquiryMessage,
  buildPickupInquiryMessage,
} from '@/application/messaging/whatsapp-message-builder';
import type { FulfillmentMode } from '@/domain/cart/inquiry';
import type { DeliveryInquiryDetails, PickupInquiryDetails } from '@/domain/cart/inquiry';
import {
  calculateLineTotal,
  formatLineQuantityLabel,
} from '@/domain/shared/order-line';
import { RESTAURANT_CONTACT } from '@/domain/shared/constants';
import { container } from '@/infrastructure/di/container';
import { useCart } from '@/presentation/providers/cart-provider';
import { useLanguage } from '@/presentation/providers/language-provider';
import { getTranslation } from '@/presentation/i18n/translations';
import CartInquiryModal from '@/components/CartInquiryModal';

export default function CartDrawer() {
  const {
    items,
    isOpen,
    closeCart,
    totalPrice,
    removeFromCart,
    updateQuantity,
    clearCart,
  } = useCart();

  const { language } = useLanguage();
  const t = getTranslation(language);
  const [inquiryMode, setInquiryMode] = useState<FulfillmentMode | null>(null);

  const inquiryCopy = {
    pickupIntro: t.cartDrawer.inquiryPickupIntro,
    deliveryIntro: t.cartDrawer.inquiryDeliveryIntro,
    messageTotal: t.cartDrawer.messageTotal,
    messageName: t.cartDrawer.messageName,
    messagePhone: t.cartDrawer.messagePhone,
    messageAddress: t.cartDrawer.messageAddress,
    messagePreferredTime: t.cartDrawer.messagePreferredTime,
    deliverySwishNote: t.cartDrawer.deliverySwishNote,
  };

  const openWhatsApp = (message: string | null) => {
    if (!message) return;
    container.messagingGateway.openWhatsApp(message);
    setInquiryMode(null);
  };

  const handlePickupSubmit = (details: PickupInquiryDetails) => {
    openWhatsApp(buildPickupInquiryMessage(items, details, inquiryCopy));
  };

  const handleDeliverySubmit = (details: DeliveryInquiryDetails) => {
    openWhatsApp(buildDeliveryInquiryMessage(items, details, inquiryCopy));
  };

  if (!isOpen) return null;

  return (
    <>
      <div
        className="fixed inset-0 bg-black/40 z-[980]"
        onClick={closeCart}
      />

      <div className="fixed top-0 right-0 h-full w-full max-w-md bg-[#F8F5F0] z-[990] shadow-2xl flex flex-col">
        <div className="flex items-center justify-between p-6 border-b border-[#EDE6D9]">
          <div className="flex items-center gap-3">
            <h2 className="text-2xl tracking-[-0.5px]">{t.cartDrawer.title}</h2>
            {items.length > 0 && (
              <span className="text-xs px-2.5 py-0.5 rounded-full bg-[#EDE6D9] text-[#6B665F]">
                {items.length} {items.length === 1 ? t.cartDrawer.item : t.cartDrawer.items}
              </span>
            )}
          </div>
          <div className="flex items-center gap-3">
            {items.length > 0 && (
              <button
                onClick={clearCart}
                className="text-xs text-[#B38B4D] hover:underline"
              >
                {t.cartDrawer.clear}
              </button>
            )}
            <button
              onClick={closeCart}
              className="text-[#6B665F] hover:text-[#2C2A26] text-2xl leading-none pl-1"
            >
              ×
            </button>
          </div>
        </div>

        <div className="flex-1 overflow-y-auto p-6">
          {items.length === 0 ? (
            <div className="flex flex-col items-center justify-center h-full text-center">
              <div className="text-6xl mb-4">🛒</div>
              <p className="text-lg text-[#6B665F]">{t.cartDrawer.empty}</p>
              <Link
                href="/menu"
                onClick={closeCart}
                className="mt-6 text-[#B38B4D] hover:underline"
              >
                {t.cartDrawer.browseMenu}
              </Link>
            </div>
          ) : (
            <div className="space-y-6">
              {items.map((item) => (
                <div key={item.id} className="flex gap-4 border-b border-[#EDE6D9] pb-6">
                  <div className="flex-1">
                    <div className="flex justify-between">
                      <div>
                        <h4 className="font-medium tracking-[-0.3px]">{item.name}</h4>
                        <p className="text-sm text-[#6B665F]">
                          {item.pricingMode === 'weight'
                            ? `${item.pricePerHalfKg ?? item.price} kr / ½ kg`
                            : `${item.price} kr × ${item.quantity}`}
                        </p>
                      </div>
                      <div className="text-right font-medium">
                        {calculateLineTotal(item)} kr
                      </div>
                    </div>

                    <div className="flex items-center gap-3 mt-3">
                      <button
                        onClick={() => updateQuantity(item.id, item.quantity - 1)}
                        className="w-8 h-8 flex items-center justify-center border border-[#EDE6D9] rounded hover:bg-white transition"
                      >
                        −
                      </button>
                      <span className="min-w-12 text-center font-medium tabular-nums">
                        {formatLineQuantityLabel(item)}
                      </span>
                      <button
                        onClick={() => updateQuantity(item.id, item.quantity + 1)}
                        className="w-8 h-8 flex items-center justify-center border border-[#EDE6D9] rounded hover:bg-white transition"
                      >
                        +
                      </button>

                      <button
                        onClick={() => removeFromCart(item.id)}
                        className="ml-auto text-xs text-[#B38B4D] hover:underline"
                      >
                        {t.cartDrawer.remove}
                      </button>
                    </div>
                  </div>
                </div>
              ))}
            </div>
          )}
        </div>

        {items.length > 0 && (
          <div className="p-6 border-t border-[#EDE6D9] bg-white">
            <button
              onClick={clearCart}
              className="text-xs text-[#8A8478] hover:text-[#B38B4D] mb-3 underline"
            >
              {t.cartDrawer.clearBasket}
            </button>

            <div className="flex justify-between text-lg font-medium mb-4">
              <span>{t.cartDrawer.total}</span>
              <span>{totalPrice.toFixed(0)} kr</span>
            </div>

            <p className="text-xs text-center text-[#6B665F] mb-4">
              {t.cartDrawer.inquiryHint}
            </p>

            <button
              type="button"
              onClick={() => setInquiryMode('pickup')}
              className="btn-primary w-full py-4 rounded-full text-base tracking-[0.5px] font-medium mb-2 flex items-center justify-center gap-2"
            >
              <MessageCircle className="h-5 w-5" aria-hidden />
              {t.cartDrawer.pickupInquiry}
            </button>

            <button
              type="button"
              onClick={() => setInquiryMode('delivery')}
              className="btn-outline w-full py-4 rounded-full text-base tracking-[0.5px] font-medium mb-2 flex items-center justify-center gap-2 border-[#25D366] text-[#128C7E] hover:bg-[#25D366]/10"
            >
              <MessageCircle className="h-5 w-5" aria-hidden />
              {t.cartDrawer.deliveryInquiry}
            </button>

            <button
              onClick={() => window.open(`tel:${RESTAURANT_CONTACT.phonePrimary}`, '_self')}
              className="btn-outline w-full py-3 rounded-full text-sm tracking-[0.5px] font-medium mb-3"
            >
              {t.cartDrawer.call}
            </button>

            <button
              onClick={closeCart}
              className="w-full text-sm text-[#6B665F] hover:text-[#2C2A26] pt-1"
            >
              {t.cartDrawer.continueBrowsing}
            </button>
          </div>
        )}
      </div>

      {inquiryMode && (
        <CartInquiryModal
          mode={inquiryMode}
          isOpen={!!inquiryMode}
          onClose={() => setInquiryMode(null)}
          onSubmitPickup={handlePickupSubmit}
          onSubmitDelivery={handleDeliverySubmit}
          labels={{
            titlePickup: t.cartDrawer.inquiryModalTitlePickup,
            titleDelivery: t.cartDrawer.inquiryModalTitleDelivery,
            nameLabel: t.cartDrawer.nameLabel,
            namePlaceholder: t.cartDrawer.namePlaceholder,
            phoneLabel: t.cartDrawer.phoneLabel,
            phonePlaceholder: t.cartDrawer.phonePlaceholder,
            addressLabel: t.cartDrawer.addressLabel,
            addressPlaceholder: t.cartDrawer.addressPlaceholder,
            preferredTimeLabel: t.cartDrawer.preferredTimeLabel,
            preferredTimePlaceholder: t.cartDrawer.preferredTimePlaceholder,
            submitPickup: t.cartDrawer.submitPickup,
            submitDelivery: t.cartDrawer.submitDelivery,
            cancel: t.cartDrawer.inquiryCancel,
            close: t.cartDrawer.inquiryClose,
            nameRequired: t.cartDrawer.nameRequired,
            phoneRequired: t.cartDrawer.phoneRequired,
            addressRequired: t.cartDrawer.addressRequired,
            timeRequired: t.cartDrawer.timeRequired,
          }}
        />
      )}
    </>
  );
}