"use client";

import React, { useState } from "react";
import { Sidebar } from "@/components/dashboard/sidebar";
import { useSidebar } from "@/hooks/useSidebar";
import { useRouter } from "next/navigation";
import { DirectSupplyCreation } from "./direct-supply-creation";
import { WholesalerProductsPage } from "./wholesaler-products-page";
import { TabsHeader } from "./tabs-header";
import { WholesalerGrid } from "./wholesaler-grid";
import { CartSummary } from "./cart-summary";
import { FloatingCart } from "./floating-cart";
import {
  WholesalerForCreation,
  WholesalerProduct,
  SelectedProduct,
  CounterpartyWholesaler,
} from "./types";
import { useQuery } from "@apollo/client";
import { GET_MY_COUNTERPARTIES, GET_ALL_PRODUCTS } from "@/graphql/queries";

export function CreateSupplyPage() {
  const router = useRouter();
  const { getSidebarMargin } = useSidebar();
  const [activeTab, setActiveTab] = useState<"cards" | "wholesaler">("cards");
  const [selectedWholesaler, setSelectedWholesaler] =
    useState<WholesalerForCreation | null>(null);
  const [selectedProducts, setSelectedProducts] = useState<SelectedProduct[]>(
    []
  );
  const [showSummary, setShowSummary] = useState(false);
  const [searchQuery, setSearchQuery] = useState("");
  const [canCreateSupply, setCanCreateSupply] = useState(false);
  const [isCreatingSupply, setIsCreatingSupply] = useState(false);

  // Загружаем контрагентов-оптовиков
  const { data: counterpartiesData, loading: counterpartiesLoading } = useQuery(
    GET_MY_COUNTERPARTIES
  );

  // Загружаем товары для выбранного оптовика
  const { data: productsData, loading: productsLoading } = useQuery(
    GET_ALL_PRODUCTS,
    {
      skip: !selectedWholesaler,
      variables: { search: null, category: null },
    }
  );

  // Фильтруем только оптовиков
  const wholesalers: CounterpartyWholesaler[] = (
    counterpartiesData?.myCounterparties || []
  ).filter((org: { type: string }) => org.type === "WHOLESALE");

  // Фильтруем товары по выбранному оптовику
  const wholesalerProducts: WholesalerProduct[] = selectedWholesaler
    ? (productsData?.allProducts || []).filter(
        (product: { organization: { id: string } }) =>
          product.organization.id === selectedWholesaler.id
      )
    : [];

  const formatCurrency = (amount: number) => {
    return new Intl.NumberFormat("ru-RU", {
      style: "currency",
      currency: "RUB",
      minimumFractionDigits: 0,
    }).format(amount);
  };

  const updateProductQuantity = (productId: string, quantity: number) => {
    const product = wholesalerProducts.find((p) => p.id === productId);
    if (!product || !selectedWholesaler) return;

    setSelectedProducts((prev) => {
      const existing = prev.find(
        (p) => p.id === productId && p.wholesalerId === selectedWholesaler.id
      );

      if (quantity === 0) {
        return prev.filter(
          (p) =>
            !(p.id === productId && p.wholesalerId === selectedWholesaler.id)
        );
      }

      if (existing) {
        return prev.map((p) =>
          p.id === productId && p.wholesalerId === selectedWholesaler.id
            ? { ...p, selectedQuantity: quantity }
            : p
        );
      } else {
        return [
          ...prev,
          {
            ...product,
            selectedQuantity: quantity,
            wholesalerId: selectedWholesaler.id,
            wholesalerName: selectedWholesaler.name,
          },
        ];
      }
    });
  };

  const getTotalAmount = () => {
    return selectedProducts.reduce((sum, product) => {
      const discountedPrice = product.discount
        ? product.price * (1 - product.discount / 100)
        : product.price;
      return sum + discountedPrice * product.selectedQuantity;
    }, 0);
  };

  const getTotalItems = () => {
    return selectedProducts.reduce(
      (sum, product) => sum + product.selectedQuantity,
      0
    );
  };

  const handleCreateSupply = () => {
    if (activeTab === "cards") {
      console.log("Создание поставки с карточками Wildberries");
    } else {
      console.log("Создание поставки с товарами:", selectedProducts);
    }
    router.push("/supplies");
  };

  const handleGoBack = () => {
    if (selectedWholesaler) {
      setSelectedWholesaler(null);
      setShowSummary(false);
    } else {
      router.push("/supplies");
    }
  };

  const handleRemoveProduct = (productId: string, wholesalerId: string) => {
    setSelectedProducts((prev) =>
      prev.filter(
        (p) => !(p.id === productId && p.wholesalerId === wholesalerId)
      )
    );
  };

  const handleCartQuantityChange = (
    productId: string,
    wholesalerId: string,
    quantity: number
  ) => {
    setSelectedProducts((prev) =>
      prev.map((p) =>
        p.id === productId && p.wholesalerId === wholesalerId
          ? { ...p, selectedQuantity: quantity }
          : p
      )
    );
  };

  const handleSupplyComplete = () => {
    router.push("/supplies");
  };

  const handleCreateSupplyClick = () => {
    setIsCreatingSupply(true);
  };

  const handleCanCreateSupplyChange = (canCreate: boolean) => {
    setCanCreateSupply(canCreate);
  };

  const handleSupplyCompleted = () => {
    setIsCreatingSupply(false);
    handleSupplyComplete();
  };

  // Рендер страницы товаров оптовика
  if (selectedWholesaler && activeTab === "wholesaler") {
    return (
      <WholesalerProductsPage
        selectedWholesaler={selectedWholesaler}
        products={wholesalerProducts}
        selectedProducts={selectedProducts}
        onQuantityChange={updateProductQuantity}
        onBack={handleGoBack}
        onCreateSupply={handleCreateSupply}
        formatCurrency={formatCurrency}
        showSummary={showSummary}
        setShowSummary={setShowSummary}
        loading={productsLoading}
      />
    );
  }

  // Главная страница с табами
  return (
    <div className="h-screen flex overflow-hidden">
      <Sidebar />
      <main
        className={`flex-1 ${getSidebarMargin()} overflow-hidden transition-all duration-300`}
        style={{ padding: '1rem' }}
      >
        <div className="flex flex-col" style={{ height: 'calc(100vh - 2rem)' }}>
          <TabsHeader
            activeTab={activeTab}
            onTabChange={setActiveTab}
            onBack={() => router.push("/supplies")}
            cartInfo={
              activeTab === "wholesaler" && selectedProducts.length > 0
                ? {
                    itemCount: selectedProducts.length,
                    totalAmount: getTotalAmount(),
                    formatCurrency,
                  }
                : undefined
            }
            onCartClick={() => setShowSummary(true)}
            onCreateSupply={handleCreateSupplyClick}
            canCreateSupply={canCreateSupply}
            isCreatingSupply={isCreatingSupply}
          />

          {/* Контент карточек - новый компонент прямого создания поставки */}
          {activeTab === "cards" && (
            <div className="flex-1 flex flex-col overflow-hidden min-h-0">
              <DirectSupplyCreation
                onComplete={handleSupplyCompleted}
                onCreateSupply={handleCreateSupplyClick}
                canCreateSupply={canCreateSupply}
                isCreatingSupply={isCreatingSupply}
                onCanCreateSupplyChange={handleCanCreateSupplyChange}
              />
            </div>
          )}

          {/* Контент оптовиков */}
          {activeTab === "wholesaler" && (
            <div>
              <CartSummary
                selectedProducts={selectedProducts}
                onQuantityChange={handleCartQuantityChange}
                onRemoveProduct={handleRemoveProduct}
                onCreateSupply={handleCreateSupply}
                onToggleVisibility={() => setShowSummary(false)}
                formatCurrency={formatCurrency}
                visible={showSummary && selectedProducts.length > 0}
              />

              <WholesalerGrid
                wholesalers={wholesalers}
                onWholesalerSelect={setSelectedWholesaler}
                searchQuery={searchQuery}
                onSearchChange={setSearchQuery}
                loading={counterpartiesLoading}
              />

              <FloatingCart
                itemCount={selectedProducts.length}
                totalAmount={getTotalAmount()}
                formatCurrency={formatCurrency}
                onClick={() => setShowSummary(true)}
                visible={selectedProducts.length > 0 && !showSummary}
              />
            </div>
          )}
        </div>
      </main>
    </div>
  );
}