import React, { memo } from 'react';
import { View, TouchableOpacity, Image, StyleSheet, Pressable } from 'react-native';
import { MaterialCommunityIcons } from '@expo/vector-icons';
import { useAppColors, spacing, borderRadius, fontSizes, type AppColors } from '../../../theme';
import { Text } from '../../common';
import type { TradeItemDTO } from '../../../types/trade';
import { TRADE_CATEGORY_MAP, TRADE_CONDITION_MAP, TRADE_TYPE_MAP } from '../../../types/trade';

export interface TradeCardProps {
  item: TradeItemDTO;
  variant?: 'list' | 'grid';
  onPress?: (id: string) => void;
  onFavorite?: (id: string) => void;
}

function formatPrice(price?: number | null): string {
  if (price == null) return '面议';
  return `¥${price.toFixed(price % 1 === 0 ? 0 : 2)}`;
}

function createTradeCardStyles(colors: AppColors) {
  return StyleSheet.create({
    gridCard: {
      backgroundColor: colors.background.paper,
      borderRadius: borderRadius.xl,
      overflow: 'hidden',
      //  subtle shadow for depth
      shadowColor: '#000',
      shadowOffset: { width: 0, height: 1 },
      shadowOpacity: 0.06,
      shadowRadius: 3,
      elevation: 2,
    },
    listCard: {
      backgroundColor: colors.background.paper,
      borderRadius: borderRadius.lg,
      overflow: 'hidden',
      padding: spacing.md,
    },
    imageContainer: {
      position: 'relative',
      aspectRatio: 1,
      backgroundColor: colors.background.default,
      minHeight: 140,
    },
    listImageContainer: {
      width: 120,
      height: 120,
      borderRadius: borderRadius.md,
      backgroundColor: colors.background.default,
      overflow: 'hidden',
    },
    image: {
      width: '100%',
      height: '100%',
      resizeMode: 'cover',
    },
    // 包邮/标签 badge 放在图片左下角，黄色背景
    shippingBadge: {
      position: 'absolute',
      bottom: 6,
      left: 6,
      paddingHorizontal: 5,
      paddingVertical: 2,
      borderRadius: borderRadius.sm,
      backgroundColor: '#FFE066',
    },
    shippingBadgeText: {
      color: '#5C4B00',
      fontSize: 10,
      fontWeight: '700',
    },
    typeBadge: {
      position: 'absolute',
      top: 6,
      left: 6,
      paddingHorizontal: 6,
      paddingVertical: 2,
      borderRadius: borderRadius.sm,
      overflow: 'hidden',
    },
    sellBadge: {
      backgroundColor: `${colors.success.main}CC`,
    },
    buyBadge: {
      backgroundColor: `${colors.primary.main}CC`,
    },
    typeBadgeText: {
      color: '#fff',
      fontSize: fontSizes.xs,
      fontWeight: '600',
    },
    statusBadge: {
      position: 'absolute',
      top: 6,
      right: 6,
      paddingHorizontal: 6,
      paddingVertical: 2,
      borderRadius: borderRadius.sm,
      backgroundColor: `${colors.warning.main}BB`,
    },
    statusBadgeText: {
      color: '#fff',
      fontSize: fontSizes.xs,
      fontWeight: '600',
    },
    gridContent: {
      paddingHorizontal: spacing.sm,
      paddingTop: spacing.xs,
      paddingBottom: spacing.sm,
    },
    titleRow: {
      flexDirection: 'row',
      alignItems: 'flex-start',
      justifyContent: 'space-between',
      gap: spacing.xs,
    },
    title: {
      fontSize: fontSizes.md,
      fontWeight: '500',
      color: colors.text.primary,
      lineHeight: 20,
      flex: 1,
    },
    priceInline: {
      fontSize: fontSizes.sm,
      fontWeight: '700',
      color: '#FF4D4F',
      flexShrink: 0,
    },
    priceRow: {
      flexDirection: 'row',
      alignItems: 'baseline',
      gap: 4,
      marginTop: spacing.xs,
    },
    price: {
      fontSize: fontSizes['2xl'],
      fontWeight: '700',
      color: '#FF4D4F',
    },
    originalPrice: {
      fontSize: fontSizes.xs,
      color: colors.text.hint,
      textDecorationLine: 'line-through',
    },
    negotiable: {
      fontSize: fontSizes.lg,
      fontWeight: '600',
      color: colors.text.secondary,
    },
    wantCount: {
      fontSize: fontSizes.xs,
      color: colors.text.hint,
      marginLeft: 4,
    },
    tagsRow: {
      flexDirection: 'row',
      flexWrap: 'wrap',
      gap: 4,
      marginTop: 2,
    },
    tag: {
      paddingHorizontal: 5,
      paddingVertical: 1,
      borderRadius: borderRadius.sm,
      backgroundColor: `${colors.primary.main}10`,
    },
    tagText: {
      fontSize: 10,
      color: colors.primary.main,
    },
    conditionTag: {
      backgroundColor: `${colors.success.main}10`,
    },
    conditionTagText: {
      fontSize: 10,
      color: colors.success.main,
    },
    // 促销标签样式（如"24小时发货"）
    promoTag: {
      paddingHorizontal: 5,
      paddingVertical: 1,
      borderRadius: borderRadius.sm,
      backgroundColor: '#FFF2F0',
      borderWidth: 0.5,
      borderColor: '#FFCCC7',
    },
    promoTagText: {
      fontSize: 10,
      color: '#FF4D4F',
    },
    bottomRow: {
      flexDirection: 'row',
      alignItems: 'center',
      justifyContent: 'space-between',
      marginTop: spacing.xs,
    },
    authorRow: {
      flexDirection: 'row',
      alignItems: 'center',
      gap: spacing.xs,
      flex: 1,
    },
    avatar: {
      width: 18,
      height: 18,
      borderRadius: 9,
      backgroundColor: colors.background.default,
    },
    authorName: {
      fontSize: 11,
      color: colors.text.secondary,
      flexShrink: 1,
    },
    statsRow: {
      flexDirection: 'row',
      alignItems: 'center',
      gap: 4,
    },
    statItem: {
      flexDirection: 'row',
      alignItems: 'center',
      gap: 2,
    },
    statText: {
      fontSize: 11,
      color: colors.text.hint,
    },
    favButton: {
      padding: 2,
    },
    listContent: {
      flex: 1,
      justifyContent: 'space-between',
    },
    listLayout: {
      flexDirection: 'row',
      gap: spacing.md,
    },
    imagePlaceholder: {
      width: '100%',
      height: '100%',
      alignItems: 'center',
      justifyContent: 'center',
      backgroundColor: colors.background.default,
    },
  });
}

const TradeCardBase: React.FC<TradeCardProps> = ({ item, variant = 'list', onPress, onFavorite }) => {
  const colors = useAppColors();
  const styles = createTradeCardStyles(colors);

  const firstImage = item.images?.[0];
  const isSell = item.trade_type === 'sell';
  const isActive = item.status === 'active';
  const conditionLabel = item.condition ? TRADE_CONDITION_MAP[item.condition as keyof typeof TRADE_CONDITION_MAP] : null;
  const categoryLabel = TRADE_CATEGORY_MAP[item.category] || item.category;

  const renderImage = (containerStyle: any, imageStyle: any) => (
    <View style={containerStyle}>
      {firstImage ? (
        <Image
          source={{ uri: firstImage.preview_url || firstImage.url }}
          style={imageStyle}
          defaultSource={undefined}
        />
      ) : (
        <View style={[imageStyle, styles.imagePlaceholder]}>
          <MaterialCommunityIcons name="image-outline" size={32} color={colors.text.hint} />
        </View>
      )}
      {/* 包邮标签 */}
      {item.is_free_shipping && (
        <View style={styles.shippingBadge}>
          <Text style={styles.shippingBadgeText}>包邮</Text>
        </View>
      )}
      <View style={[styles.typeBadge, isSell ? styles.sellBadge : styles.buyBadge]}>
        <Text style={styles.typeBadgeText}>{TRADE_TYPE_MAP[item.trade_type]}</Text>
      </View>
      {!isActive && (
        <View style={styles.statusBadge}>
          <Text style={styles.statusBadgeText}>
            {item.status === 'sold' ? '已售' : item.status === 'bought' ? '已收' : item.status === 'offline' ? '下架' : ''}
          </Text>
        </View>
      )}
    </View>
  );

  const renderTitleRow = () => (
    <View style={styles.titleRow}>
      <Text style={styles.title} numberOfLines={2}>{item.title}</Text>
      <Text style={styles.priceInline}>
        {item.price != null ? formatPrice(item.price) : '面议'}
      </Text>
    </View>
  );

  const renderTags = () => {
    if (!conditionLabel && !isSell && !item.is_quick_ship) return null;
    return (
      <View style={styles.tagsRow}>
        {conditionLabel && isSell && (
          <View style={[styles.tag, styles.conditionTag]}>
            <Text style={styles.conditionTagText}>{conditionLabel}</Text>
          </View>
        )}
        {item.is_quick_ship && (
          <View style={styles.promoTag}>
            <Text style={styles.promoTagText}>24小时发货</Text>
          </View>
        )}
      </View>
    );
  };

  const renderBottom = () => (
    <View style={styles.bottomRow}>
      <View style={styles.authorRow}>
        {item.author?.avatar ? (
          <Image source={{ uri: item.author.avatar }} style={styles.avatar} />
        ) : (
          <View style={[styles.avatar, { backgroundColor: colors.primary.main + '33' }]} />
        )}
        <Text style={styles.authorName} numberOfLines={1}>{item.author?.nickname || '匿名'}</Text>
      </View>
      <View style={styles.statsRow}>
        {(item.good_reputation || 0) > 0 && (
          <View style={[styles.promoTag, { backgroundColor: '#FFF7E6', borderColor: '#FFD591' }]}>
            <Text style={[styles.promoTagText, { color: '#FA8C16' }]}>回头客好评过百</Text>
          </View>
        )}
        <View style={styles.tag}>
          <Text style={styles.tagText}>{categoryLabel}</Text>
        </View>
      </View>
    </View>
  );

  if (variant === 'grid') {
    return (
      <TouchableOpacity
        style={styles.gridCard}
        onPress={() => onPress?.(item.id)}
        activeOpacity={0.7}
      >
        {renderImage(styles.imageContainer, styles.image)}
        <View style={styles.gridContent}>
          {renderTitleRow()}
          {renderTags()}
          {renderBottom()}
        </View>
      </TouchableOpacity>
    );
  }

  // grid variant is used in masonry layout; list variant below is unused but kept for compatibility


  return (
    <TouchableOpacity
      style={styles.listCard}
      onPress={() => onPress?.(item.id)}
      activeOpacity={0.7}
    >
      <View style={styles.listLayout}>
        {renderImage(styles.listImageContainer, styles.image)}
        <View style={styles.listContent}>
          {renderTitleRow()}
          {renderTags()}
          {renderBottom()}
        </View>
      </View>
    </TouchableOpacity>
  );
};

export const TradeCard = memo(TradeCardBase);

export default TradeCard;