import React, { useCallback, useState, useRef, useEffect } from "react";
import {
  View,
  Text,
  StyleSheet,
  TouchableOpacity,
  FlatList,
  InteractionManager,
  Image,
  ScrollView,
  Modal,
  ImageBackground,
  RefreshControl,
  Dimensions,
} from "react-native";

import {
  productApi,
  ProductParams,
  type Product,
} from "../services/api/productApi";
import Carousel from "react-native-reanimated-carousel";
import Ionicons from "@expo/vector-icons/Ionicons";
import { useNavigation } from "@react-navigation/native";
import { NativeStackNavigationProp } from "@react-navigation/native-stack";
import { useTranslation } from "react-i18next";
import widthUtils from "../utils/widthUtils";
import DownArrowIcon from "../components/DownArrowIcon";
import { LinearGradient } from "expo-linear-gradient";
import fontSize from "../utils/fontsizeUtils";
import CloseIcon from "../components/CloseIcon";
import CheckmarkIcon from "../components/CheckmarkIcon";
// 为图标定义类型
type IconProps = {
  name: string;
  size: number;
  color: string;
};

// 图标组件辅助函数 - 使用React.memo优化渲染
const IconComponent = React.memo(({ name, size, color }: IconProps) => {
  const Icon = Ionicons as any;
  return <Icon name={name} size={size} color={color} />;
});

type SubcategoryItem = {
  id: string | number;
  title: string;
  icon: string;
};

type CategoryContentType = {
  [key: string]: SubcategoryItem[];
};

export const HomeScreen = () => {
  const [activeIndex, setActiveIndex] = useState(0);
  const screenWidth = Dimensions.get("window").width;
  const navigation = useNavigation<NativeStackNavigationProp<any>>();
  const { t } = useTranslation();
  const [showCategoryModal, setShowCategoryModal] = useState(false);
  const [selectedCategory, setSelectedCategory] = useState("Bijoux");
  const [selectedHorizontalCategory, setSelectedHorizontalCategory] =
    useState("Tous");
  const [refreshing, setRefreshing] = useState(false);
  const horizontalScrollRef = useRef<ScrollView>(null);
  const [searchParams, setSearchParams] = useState<ProductParams>({
    keyword: "pen",
    page: 1,
    page_size: 20,
    sort_order: "desc",
    category_id: null,
    sort_by: "default",
    language: "en",
  });
  const [products, setProducts] = useState<Product[]>([]);
  const flatListRef = useRef<FlatList>(null);
  const data = [
    { imgUrl: require("../../assets/img/banner en (5).png") },
    { imgUrl: require("../../assets/img/banner en (3).png") },
    { imgUrl: require("../../assets/img/banner en (4).png") },
  ];

  const getProductData = async () => {
    try {
      const res = await productApi.getSearchProducts(searchParams);
      setProducts(res.products);
    } catch (error) {
      console.error("Error fetching products:", error);
    }
  };

  const handleProductPress = useCallback((item: Product) => {
    InteractionManager.runAfterInteractions(() => {
      navigation.navigate("ProductDetail", {
        offer_id: item.offer_id,
        searchKeyword: searchParams.keyword,
        price: item.min_price,
      });
    });
  }, [navigation]);

  const onRefresh = useCallback(async () => {
    setRefreshing(true);
    try {
      await getProductData();
    } finally {
      setRefreshing(false);
    }
  }, [searchParams]);

  useEffect(() => {
    getProductData();
  }, []);

  const categories = [
    "Tous",
    "Bijoux",
    "Maison et Cuisine",
    "Vêtements femme",
    "Grandes tailles femme",
    "Chaussures femme",
    "Pyjamas et Sous-vête-ments",
    "Accessoires beauté",
    "Soins cheveux",
    "Hygiène et Soins pour le corps",
    "Maquillage",
  ];

  const defaultSubcategories: SubcategoryItem[] = [
    { id: 1, title: "Jewelry", icon: "diamond-outline" },
    { id: 2, title: "Earrings", icon: "ear-outline" },
    { id: 3, title: "Bracelet", icon: "watch-outline" },
    { id: 4, title: "Jewelry Sets", icon: "gift-outline" },
    { id: 5, title: "Earrings", icon: "ear-outline" },
    { id: 6, title: "Bracelet", icon: "watch-outline" },
  ];

  const categoryContent: CategoryContentType = {
    Tous: [],
    Bijoux: defaultSubcategories,
    "Maison et Cuisine": defaultSubcategories,
    "Vêtements femme": defaultSubcategories,
    "Grandes tailles femme": defaultSubcategories,
    "Chaussures femme": defaultSubcategories,
    "Pyjamas et Sous-vête-ments": defaultSubcategories,
    "Accessoires beauté": defaultSubcategories,
    "Soins cheveux": defaultSubcategories,
    "Hygiène et Soins pour le corps": defaultSubcategories,
    Maquillage: defaultSubcategories,
  };

  useEffect(() => {
    // Ensure the content is available when category changes
    if (!categoryContent[selectedHorizontalCategory]) {
      setSelectedHorizontalCategory("Tous");
    }
  }, [selectedHorizontalCategory]);

  // 导航到搜索页面 - 使用useCallback优化函数引用
  const navigateToSearch = useCallback(() => {
    // 使用InteractionManager延迟执行导航操作，确保当前交互和动画已完成
    InteractionManager.runAfterInteractions(() => {
      navigation.navigate("Search");
    });
  }, [navigation]);

  const navigateToShippingDetails = useCallback(() => {
    InteractionManager.runAfterInteractions(() => {
      navigation.navigate("ShippingDetailsSection");
    });
  }, [navigation]);

  const navigateToInquiry = useCallback(() => {
    InteractionManager.runAfterInteractions(() => {
      navigation.navigate("InquiryScreen");
    });
  }, [navigation]);

  const scrollToCategory = (category: string) => {
    const categoryIndex = categories.findIndex((c) => c === category);
    if (categoryIndex !== -1 && horizontalScrollRef.current) {
      const firstFourKeys = Object.keys(categoryContent).slice(
        0,
        categoryIndex - 1
      );
      let str = "";
      firstFourKeys.forEach((key, index) => {
        str += key;
      });

      horizontalScrollRef.current.scrollTo({
        x: str.length * fontSize(16) + (categoryIndex - 1 + 17),
        animated: true,
      });
    }
  };

  // 渲染产品列表项
  const renderProductItem = ({ item }: { item: Product }) => (
    <TouchableOpacity
      onPress={() => handleProductPress(item)}
      activeOpacity={0.9}
      style={styles.beautyProductCard1}
    >
      <ImageBackground
        style={styles.beautyCardContainer1}
        source={{ uri: item.product_image_urls[0] }}
      >
        <TouchableOpacity style={styles.vipButton}>
          <Text style={styles.vipButtonText}>VIP</Text>
          <Text style={styles.vipLabelBold}> 1</Text>
        </TouchableOpacity>
      </ImageBackground>
      <View style={styles.beautyProductCard}>
        <Text
          style={styles.beautyProductTitle}
          numberOfLines={2}
          ellipsizeMode="tail"
        >
          {item.subject || "Soins de beauté soins de la peau/maquillage..."}
        </Text>
        <View style={styles.beautyProductInfoRow}>
          <View style={styles.flexRowCentered}>
            <Text style={styles.highlightedText}>
              {item.min_price || "300"}
            </Text>
            <Text style={styles.highlightedText1}>FCFA</Text>
          </View>
          <View style={styles.priceContainer1}>
            <Text style={styles.priceLabel1}>3000FCFA</Text>
          </View>
        </View>
        <Text style={styles.beautySalesInfo}>
          {item.sold_out || "28000"}+ ventes
        </Text>
      </View>
    </TouchableOpacity>
  );

  // 渲染列表头部内容
  const renderHeader = () => (
    <>
      {/* 轮播图 */}
      <View style={styles.swiperContainer}>
        <Carousel
          loop
          width={screenWidth}
          data={data}
          height={widthUtils(286, 286).height}
          onSnapToItem={(index) => setActiveIndex(index)}
          modeConfig={{
            parallaxScrollingScale: 0.9,
            parallaxScrollingOffset: 50,
          }}
          renderItem={({ item }) => (
            <View
              key={item.imgUrl}
              style={{
                flex: 1,
                justifyContent: "center",
                alignItems: "center",
                backgroundColor: "#f2f2f2",
                borderRadius: 10,
                overflow: 'hidden',
              }}
            >
              <Image
                source={item.imgUrl}
                style={{ width: "100%", height: "100%" }}
                resizeMode="cover"
                defaultSource={require("../../assets/img/banner en (3).png")}
              />
            </View>
          )}
        />

        {/* 自定义指示器 */}
        {/* <View style={styles.indicatorContainer}>
          {data.map((_, index) => (
            <View
              key={index}
              style={[
                styles.indicator,
                activeIndex === index ? styles.activeIndicator : styles.inactiveIndicator,
              ]}
            />
          ))}
        </View> */}

        {/* 搜索栏 - 定位在轮播图上方 */}
        <View style={styles.searchOverlay}>
          <TouchableOpacity
            style={styles.searchBar}
            activeOpacity={0.7}
            onPress={navigateToSearch}
          >
            <IconComponent name="search-outline" size={20} color="#999" />
            <Text style={styles.searchPlaceholder}>{t("searchProducts")}</Text>
            <TouchableOpacity style={styles.cameraButton}>
              <IconComponent name="camera-outline" size={24} color="#333" />
            </TouchableOpacity>
          </TouchableOpacity>
        </View>
      </View>

      {/* 内容区域 */}
      <View style={styles.bannerContainer}>
        {/* 左侧区域 - 上下两个 */}
        <View style={styles.leftContainer}>
          <TouchableOpacity
            style={styles.leftTopItem}
            onPress={navigateToShippingDetails}
          >
            <Image
              source={require("../../assets/img/a_计算运费.png")}
              style={styles.bannerIcon}
            />
          </TouchableOpacity>
          <TouchableOpacity style={styles.leftBottomItem}>
            <Image
              source={require("../../assets/img/a_tiktok.png")}
              style={styles.bannerIcon}
            />
          </TouchableOpacity>
        </View>

        {/* 右侧区域 - 一个 */}
        <TouchableOpacity
          style={styles.rightContainer}
          onPress={navigateToInquiry}
        >
          <Image
            source={require("../../assets/img/a_VIP.png")}
            style={styles.bigbannerIcon}
          />
        </TouchableOpacity>
      </View>

      <View style={styles.category}>
        <View style={styles.categoryScrollContainer}>
          <ScrollView
            ref={horizontalScrollRef}
            horizontal
            showsHorizontalScrollIndicator={false}
            style={styles.categoryScroll}
          >
            {categories.map((category, index) => (
              <TouchableOpacity
                key={index}
                style={[
                  styles.categoryItem,
                  selectedHorizontalCategory === category &&
                    styles.categoryItemActive,
                ]}
                onPress={() => setSelectedHorizontalCategory(category)}
              >
                <Text
                  style={[
                    styles.categoryText,
                    selectedHorizontalCategory === category &&
                      styles.categoryTextActive,
                  ]}
                >
                  {category}
                </Text>
              </TouchableOpacity>
            ))}
          </ScrollView>
          <LinearGradient
            colors={["rgba(255,255,255,0)", "rgba(255,255,255,1)"]}
            start={{ x: 0, y: 0 }}
            end={{ x: 1, y: 0 }}
            style={styles.fadeGradient}
          />
        </View>
        <View style={styles.categoryArrowContainer}>
          <TouchableOpacity onPress={() => setShowCategoryModal(true)}>
            <DownArrowIcon size={fontSize(18)} color="#666" rotation={360} />
          </TouchableOpacity>
        </View>
      </View>

      {/* Subcategory Content */}
      {selectedHorizontalCategory &&
      categoryContent[selectedHorizontalCategory] &&
      categoryContent[selectedHorizontalCategory].length > 0 ? (
        <View style={styles.subcategoryContainer}>
          <ScrollView
            horizontal
            showsHorizontalScrollIndicator={false}
            style={styles.subcategoryScroll}
            contentContainerStyle={styles.subcategoryContent}
          >
            {categoryContent[selectedHorizontalCategory].map((item) => (
              <TouchableOpacity
                key={item.id}
                style={styles.subcategoryItem}
                onPress={() => {
                  // Handle subcategory selection
                }}
              >
                <View style={styles.subcategoryImagePlaceholder}>
                  <IconComponent name={item.icon} size={24} color="#666" />
                </View>
                <Text style={styles.subcategoryText}>{item.title}</Text>
              </TouchableOpacity>
            ))}
          </ScrollView>
        </View>
      ) : null}
    </>
  );

  return (
    <View style={styles.container}>
      <FlatList
        ref={flatListRef}
        data={products}
        numColumns={2}
        showsVerticalScrollIndicator={false}
        columnWrapperStyle={styles.productCardGroup}
        renderItem={renderProductItem}
        keyExtractor={(item, index) =>
          item.offer_id?.toString() || index.toString()
        }
        contentContainerStyle={{
          paddingBottom: 15,
          backgroundColor: "transparent",
        }}
        ListHeaderComponent={renderHeader}
        refreshControl={
          <RefreshControl
            refreshing={refreshing}
            onRefresh={onRefresh}
            colors={["#ff5100"]}
            tintColor="#ff5100"
            progressBackgroundColor="transparent"
          />
        }
      />

      {/* Categories Modal */}
      <Modal
        visible={showCategoryModal}
        animationType="slide"
        transparent={true}
        onRequestClose={() => setShowCategoryModal(false)}
      >
        <View style={styles.modalOverlay}>
          <View style={styles.modalContent}>
            <View style={styles.modalHeader}>
              <View style={styles.modalTitleContainer}>
                <Ionicons name="flame-outline" size={24} color="#000" />
                <Text style={styles.modalTitle}>{t("popularCategories")}</Text>
              </View>
              <TouchableOpacity
                style={styles.closeButton}
                onPress={() => setShowCategoryModal(false)}
              >
                <Text style={styles.closeButtonText}>
                  <CloseIcon size={18} color="#000" />
                </Text>
              </TouchableOpacity>
            </View>
            <ScrollView style={styles.modalScrollView}>
              {categories.map((category, index) => (
                <TouchableOpacity
                  key={index}
                  style={styles.categoryModalItem}
                  onPress={() => {
                    setSelectedCategory(category);
                    setSelectedHorizontalCategory(category);
                    setShowCategoryModal(false);
                    scrollToCategory(category);
                  }}
                >
                  <Text
                    style={[
                      styles.categoryModalText,
                      selectedCategory === category &&
                        styles.selectedCategoryText,
                    ]}
                  >
                    {category}
                  </Text>
                  {selectedCategory === category && (
                    <CheckmarkIcon size={fontSize(16)} color="#000" />
                  )}
                </TouchableOpacity>
              ))}
            </ScrollView>
          </View>
        </View>
      </Modal>
    </View>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
  },
  safeArea: {
    flex: 1,
  },
  swpImg: {
    width: "100%",
    height: 180,
  },
  searchOverlay: {
    position: "absolute",
    top: 60,
    left: 15,
    right: 15,
    zIndex: 10,
  },
  searchBar: {
    flexDirection: "row",
    alignItems: "center",
    backgroundColor: "rgba(255, 255, 255, 0.9)",
    borderRadius: 20,
    paddingHorizontal: 15,
    height: 40,
    shadowColor: "#000",
    shadowOffset: {
      width: 0,
      height: 2,
    },
    shadowOpacity: 0.1,
    shadowRadius: 3,
    elevation: 3,
  },
  searchPlaceholder: {
    flex: 1,
    marginLeft: 8,
    fontSize: 16,
  },
  cameraButton: {
    padding: 5,
  },
  bannerContainer: {
    flexDirection: "row",
    marginTop: 20,
    paddingHorizontal: 15,
    width: "100%",
  },
  leftContainer: {
    marginRight: "4%",
  },
  leftTopItem: {
    height: widthUtils(90, 200).height,
    width: widthUtils(90, 200).width,
    borderRadius: 8,
    padding: 0,
    marginBottom: 10,
    overflow: "hidden",
  },
  leftBottomItem: {
    height: widthUtils(90, 200).height,
    width: widthUtils(90, 200).width,
    borderRadius: 8,
    padding: 0,
    overflow: "hidden",
  },
  rightContainer: {
    width: widthUtils(190, 180).width,
    height: widthUtils(190, 180).height,
    borderRadius: 8,
    padding: 0,
    overflow: "hidden",
    flex: 1,
  },
  bannerIcon: {
    width: "100%",
    height: "100%",
    objectFit: "contain",
  },
  bigbannerIcon: {
    width: "100%",
    height: "100%",
    objectFit: "contain",
  },
  category: {
    width: "100%",
    paddingVertical: 10,
    flexDirection: "row",
    alignItems: "center",
    marginTop: 10,
    backgroundColor: "#fff",
  },
  categoryScrollContainer: {
    flex: 1,
    position: "relative",
    overflow: "hidden",
    paddingRight: 55,
  },
  categoryScroll: {
    paddingHorizontal: 15,
  },
  categoryItem: {
    paddingHorizontal: 12,
    paddingVertical: 8,
    marginRight: 5,
  },
  categoryItemActive: {
    borderBottomWidth: 2,
    borderBottomColor: "#000",
  },
  categoryText: {
    fontSize: fontSize(16),
    color: "#747474",
    fontFamily: "Alexandria",
    fontWeight: "400",
  },
  categoryTextActive: {
    color: "#000",
    fontWeight: "500",
  },

  swiperContainer: {
    width: "100%",
    height: widthUtils(286, 430).height,
    paddingHorizontal: 0,
  },
  swiper: {
    width: "100%",
  },
  dot: {
    backgroundColor: "rgba(255,255,255,0.5)",
    width: 8,
    height: 8,
    borderRadius: 4,
    marginLeft: 3,
    marginRight: 3,
  },
  activeDot: {
    backgroundColor: "#fff",
    width: 20,
    height: 8,
    borderRadius: 4,
    marginLeft: 3,
    marginRight: 3,
  },
  slide: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    width: "100%",
  },
  slideImage: {
    width: "100%",
    height: "100%",
  },
  fadeGradient: {
    position: "absolute",
    right: 40,
    top: 0,
    bottom: 0,
    width: 40,
    zIndex: 1,
    backgroundColor: "transparent",
  },
  categoryArrowContainer: {
    position: "absolute",
    right: 0,
    paddingRight: 15,
    height: "100%",
    justifyContent: "center",
    alignItems: "center",
    zIndex: 2,
    backgroundColor: "#fff",
  },
  modalOverlay: {
    flex: 1,
    backgroundColor: "rgba(0, 0, 0, 0.5)",
    justifyContent: "flex-end",
  },
  modalContent: {
    backgroundColor: "#fff",
    borderTopLeftRadius: 20,
    borderTopRightRadius: 20,
    maxHeight: "80%",
  },
  modalHeader: {
    flexDirection: "row",
    alignItems: "center",
    justifyContent: "space-between",
    padding: 16,
    borderBottomWidth: 1,
    borderBottomColor: "#f0f0f0",
  },
  modalTitleContainer: {
    flexDirection: "row",
    alignItems: "center",
  },
  modalTitle: {
    fontSize: fontSize(16),
    fontWeight: "600",
    marginLeft: 8,
  },
  closeButton: {
    padding: 8,
  },
  closeButtonText: {
    fontSize: fontSize(24),
    color: "#000",
    fontWeight: "300",
  },
  modalScrollView: {
    padding: 16,
  },
  categoryModalItem: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center",
    paddingVertical: 16,
  },
  categoryModalText: {
    fontSize: fontSize(16),
    color: "#666",
    fontFamily: "Segoe UI",
    fontWeight: "700",
  },
  selectedCategoryText: {
    color: "#000",
    fontWeight: "500",
  },
  subcategoryContainer: {
    height: 100, // Fixed height for the subcategory container
    marginTop: 15,
  },
  subcategoryScroll: {
    flex: 1,
  },
  subcategoryContent: {
    paddingHorizontal: 15,
  },
  subcategoryItem: {
    alignItems: "center",
    marginRight: 15,
    width: 60,
  },
  subcategoryImagePlaceholder: {
    width: 60,
    height: 60,
    borderRadius: 30,
    backgroundColor: "#f5f5f5",
    justifyContent: "center",
    alignItems: "center",
    marginBottom: 8,
  },
  subcategoryText: {
    fontSize: fontSize(12),
    color: "#333",
    textAlign: "center",
    fontFamily: "Alexandria",
  },
  productContainer: {
    flex: 1,
    backgroundColor: "#fff",
  },
  productCardList: {
    padding: 15,
    paddingTop: 0,
  },
  productCardGroup: {
    justifyContent: "space-between",
    marginBottom: 15,
    paddingHorizontal: 15,
  },
  beautyProductCard1: {
    width: "48%",
  },
  beautyCardContainer1: {
    flexDirection: "column",
    alignItems: "flex-end",
    justifyContent: "center",
    width: "100%",
    paddingBottom: 160,
    backgroundColor: "transparent",
    borderRadius: 10,
    overflow: "hidden",
  },
  vipButton: {
    width: 66,
    height: 30,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor:
      "linear-gradient(32.02deg, rgba(240, 179, 46, 1) 29.07%, rgba(236, 212, 95, 1) 72.56%)",
    borderRadius: 10,
  },
  vipButtonText: {
    fontStyle: "italic",
    fontWeight: "900",
    fontSize: 18,
    color: "transparent",
  },
  vipLabelBold: {
    fontStyle: "italic",
    fontWeight: "900",
    fontSize: 18,
    color: "transparent",
  },
  beautyProductCard: {
    marginTop: 9,
  },
  beautyProductTitle: {
    fontSize: 14,
    fontWeight: "600",
    color: "black",
    lineHeight: 18,
  },
  beautyProductInfoRow: {
    flexDirection: "row",
    alignItems: "center",
  },
  flexRowCentered: {
    flexDirection: "row",
    alignItems: "center",
  },
  highlightedText: {
    fontWeight: "700",
    fontSize: 24,
    color: "#ff5100",
  },
  highlightedText1: {
    fontWeight: "700",
    fontSize: 14,
    color: "#ff5100",
  },
  priceContainer1: {
    marginLeft: 5.75,
  },
  priceLabel1: {
    fontSize: 12,
    fontWeight: "600",
    color: "#9a9a9a",
  },
  beautySalesInfo: {
    marginTop: 6.75,
    fontSize: 14,
    fontWeight: "600",
    color: "#7c7c7c",
  },
  indicatorContainer: {
    flexDirection: 'row',
    justifyContent: 'center',
    alignItems: 'center',
    position: 'absolute',
    bottom: 10,
    left: 0,
    right: 0,
  },
  indicator: {
    marginHorizontal: 4,
    borderRadius: 3,
  },
  activeIndicator: {
    width: 14,
    height: 6,
    backgroundColor: '#fff',
  },
  inactiveIndicator: {
    width: 6,
    height: 6,
    backgroundColor: 'rgba(255, 255, 255, 0.5)',
  },
});