import 'dart:math' as math;
import 'dart:ui' as ui;
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:intl/intl.dart';
import '../../../core/constants/app_colors.dart';
import '../../../core/utils/format_utils.dart';
import '../../../data/models/trade_order_model.dart';
import '../../../domain/entities/price_info.dart';
import '../../../domain/entities/market_overview.dart';
import '../../../domain/entities/trade_order.dart';
import '../../../domain/entities/kline.dart';
import '../../providers/user_providers.dart';
import '../../providers/trading_providers.dart';
import '../../widgets/shimmer_loading.dart';

class TradingPage extends ConsumerStatefulWidget {
  const TradingPage({super.key});

  @override
  ConsumerState<TradingPage> createState() => _TradingPageState();
}

class _TradingPageState extends ConsumerState<TradingPage> {
  // 设计色彩
  static const Color _orange = Color(0xFFFF6B00);
  static const Color _green = Color(0xFF10B981);
  static const Color _red = Color(0xFFEF4444);
  static const Color _grayText = Color(0xFF6B7280);
  static const Color _darkText = Color(0xFF1F2937);
  static const Color _bgGray = Color(0xFFF3F4F6);
  static const Color _lightGray = Color(0xFFF9FAFB);
  static const Color _borderGray = Color(0xFFE5E7EB);

  // 状态
  int _selectedTab = 1; // 0: 买入, 1: 卖出
  int _selectedTimeRange = 1; // 时间周期选择
  final _quantityController = TextEditingController();
  final _priceController = TextEditingController();

  final List<String> _timeRanges = ['1分', '5分', '15分', '30分', '1时', '4时', '日'];

  @override
  void dispose() {
    _quantityController.dispose();
    _priceController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final priceAsync = ref.watch(currentPriceProvider);
    final marketAsync = ref.watch(marketOverviewProvider);
    final ordersAsync = ref.watch(ordersProvider);
    final user = ref.watch(userNotifierProvider);
    final accountSequence = user.accountSequence ?? '';

    return Scaffold(
      backgroundColor: const Color(0xFFF5F5F5),
      body: SafeArea(
        bottom: false,
        child: RefreshIndicator(
          onRefresh: () async {
            ref.invalidate(currentPriceProvider);
            ref.invalidate(marketOverviewProvider);
            ref.invalidate(ordersProvider);
          },
          child: Column(
            children: [
              _buildAppBar(),
              Expanded(
                child: SingleChildScrollView(
                  child: Column(
                    children: [
                      _buildPriceCard(priceAsync),
                      _buildChartSection(priceAsync),
                      _buildMarketDataCard(marketAsync),
                      _buildTradingPanel(priceAsync),
                      _buildMyOrdersCard(ordersAsync),
                      const SizedBox(height: 24),
                    ],
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildAppBar() {
    return Container(
      color: _bgGray.withValues(alpha: 0.9),
      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Container(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
            decoration: BoxDecoration(
              color: _orange,
              borderRadius: BorderRadius.circular(9999),
            ),
            child: const Text(
              '积分股交易',
              style: TextStyle(
                fontSize: 14,
                fontWeight: FontWeight.bold,
                color: Colors.white,
              ),
            ),
          ),
          Container(
            width: 40,
            height: 40,
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.circular(20),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withValues(alpha: 0.1),
                  blurRadius: 4,
                  offset: const Offset(0, 2),
                ),
              ],
            ),
            child: Stack(
              children: [
                const Center(
                  child: Icon(Icons.notifications_outlined, color: _grayText),
                ),
                Positioned(
                  right: 10,
                  top: 10,
                  child: Container(
                    width: 8,
                    height: 8,
                    decoration: const BoxDecoration(
                      color: Colors.red,
                      shape: BoxShape.circle,
                    ),
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildPriceCard(AsyncValue<PriceInfo?> priceAsync) {
    final isLoading = priceAsync.isLoading;
    final priceInfo = priceAsync.valueOrNull;
    final hasError = priceAsync.hasError;

    if (hasError && priceInfo == null) {
      return _buildErrorCard('价格加载失败');
    }

    final price = priceInfo?.price ?? '0';

    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          const Text(
            '当前积分股价格',
            style: TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.w500,
              color: _grayText,
            ),
          ),
          const SizedBox(height: 8),
          Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              AmountText(
                amount: priceInfo != null ? formatPrice(price) : null,
                isLoading: isLoading,
                prefix: '\u00A5 ',
                style: const TextStyle(
                  fontSize: 30,
                  fontWeight: FontWeight.bold,
                  color: _orange,
                  letterSpacing: -0.75,
                ),
              ),
              const SizedBox(width: 8),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                decoration: BoxDecoration(
                  color: _green.withValues(alpha: 0.1),
                  borderRadius: BorderRadius.circular(16),
                ),
                child: Row(
                  mainAxisSize: MainAxisSize.min,
                  children: [
                    const Icon(Icons.trending_up, size: 16, color: _green),
                    DataText(
                      data: isLoading ? null : '+0.00%',
                      isLoading: isLoading,
                      placeholder: '+--.--%',
                      style: const TextStyle(
                        fontSize: 14,
                        fontWeight: FontWeight.bold,
                        color: _green,
                      ),
                    ),
                  ],
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildChartSection(AsyncValue<PriceInfo?> priceAsync) {
    final priceInfo = priceAsync.valueOrNull;
    final currentPrice = priceInfo?.price ?? '0.000000';
    final klinesAsync = ref.watch(klinesProvider);
    final klines = klinesAsync.valueOrNull ?? [];

    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 16),
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        children: [
          Container(
            height: 200,
            decoration: BoxDecoration(
              color: _lightGray,
              borderRadius: BorderRadius.circular(8),
            ),
            child: klinesAsync.isLoading
                ? const Center(child: CircularProgressIndicator(strokeWidth: 2))
                : Stack(
                    children: [
                      CustomPaint(
                        size: const Size(double.infinity, 200),
                        painter: _CandlestickPainter(klines: klines),
                      ),
                      if (klines.isNotEmpty)
                        Positioned(
                          right: 0,
                          top: 60,
                          child: Container(
                            padding: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
                            decoration: BoxDecoration(
                              color: _orange,
                              borderRadius: BorderRadius.circular(4),
                              boxShadow: [
                                BoxShadow(
                                  color: Colors.black.withValues(alpha: 0.1),
                                  blurRadius: 2,
                                  offset: const Offset(0, 1),
                                ),
                              ],
                            ),
                            child: Text(
                              formatPrice(currentPrice),
                              style: const TextStyle(fontSize: 10, color: Colors.white),
                            ),
                          ),
                        ),
                    ],
                  ),
          ),
          const SizedBox(height: 16),
          SingleChildScrollView(
            scrollDirection: Axis.horizontal,
            child: Row(
              children: List.generate(_timeRanges.length, (index) {
                final isSelected = _selectedTimeRange == index;
                return Padding(
                  padding: const EdgeInsets.only(right: 8),
                  child: GestureDetector(
                    onTap: () {
                      setState(() => _selectedTimeRange = index);
                      // 更新选中的周期，触发K线数据刷新
                      ref.read(selectedKlinePeriodProvider.notifier).state = _timeRanges[index];
                    },
                    child: Container(
                      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 6),
                      decoration: BoxDecoration(
                        color: isSelected ? _orange : Colors.white,
                        borderRadius: BorderRadius.circular(9999),
                        border: isSelected ? null : Border.all(color: _borderGray),
                      ),
                      child: Text(
                        _timeRanges[index],
                        style: TextStyle(
                          fontSize: 12,
                          fontWeight: FontWeight.w500,
                          color: isSelected ? Colors.white : _grayText,
                        ),
                      ),
                    ),
                  ),
                );
              }),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildMarketDataCard(AsyncValue<MarketOverview?> marketAsync) {
    final isLoading = marketAsync.isLoading;
    final market = marketAsync.valueOrNull;
    final hasError = marketAsync.hasError;

    if (hasError && market == null) {
      return _buildErrorCard('市场数据加载失败');
    }

    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            children: [
              Container(
                width: 4,
                height: 16,
                decoration: BoxDecoration(
                  color: _orange,
                  borderRadius: BorderRadius.circular(2),
                ),
              ),
              const SizedBox(width: 8),
              const Text(
                '市场数据',
                style: TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.bold,
                  color: _darkText,
                ),
              ),
            ],
          ),
          const SizedBox(height: 24),
          Row(
            children: [
              _buildMarketDataItem(
                '总积分股',
                market != null ? formatCompact(market.totalShares) : null,
                _orange,
                isLoading,
              ),
              Container(width: 1, height: 24, color: _bgGray),
              const SizedBox(width: 16),
              _buildMarketDataItem(
                '流通池',
                market != null ? formatCompact(market.circulationPool) : null,
                _orange,
                isLoading,
              ),
            ],
          ),
          const SizedBox(height: 24),
          Container(height: 1, color: _bgGray),
          const SizedBox(height: 24),
          Row(
            children: [
              _buildMarketDataItem(
                '积分值池',
                market != null ? formatCompact(market.greenPoints) : null,
                _orange,
                isLoading,
              ),
              Container(width: 1, height: 24, color: _bgGray),
              const SizedBox(width: 16),
              _buildMarketDataItem(
                '黑洞销毁量',
                market != null ? formatCompact(market.blackHoleAmount) : null,
                _red,
                isLoading,
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildMarketDataItem(String label, String? value, Color valueColor, bool isLoading) {
    return Expanded(
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(label, style: const TextStyle(fontSize: 12, color: _grayText)),
          const SizedBox(height: 4),
          DataText(
            data: value,
            isLoading: isLoading,
            placeholder: '--,---,---',
            style: TextStyle(
              fontSize: 14,
              fontWeight: FontWeight.bold,
              color: valueColor,
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildTradingPanel(AsyncValue<PriceInfo?> priceAsync) {
    final priceInfo = priceAsync.valueOrNull;
    final currentPrice = priceInfo?.price ?? '0';

    // 设置默认价格
    if (_priceController.text.isEmpty && priceInfo != null) {
      _priceController.text = currentPrice;
    }

    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 16),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        children: [
          Container(
            decoration: const BoxDecoration(
              border: Border(bottom: BorderSide(color: _bgGray)),
            ),
            child: Row(
              children: [
                Expanded(
                  child: GestureDetector(
                    onTap: () => setState(() => _selectedTab = 0),
                    child: Container(
                      padding: const EdgeInsets.only(bottom: 12),
                      decoration: BoxDecoration(
                        border: Border(
                          bottom: BorderSide(
                            color: _selectedTab == 0 ? _orange : Colors.transparent,
                            width: 2,
                          ),
                        ),
                      ),
                      child: Text(
                        '买入',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.bold,
                          color: _selectedTab == 0 ? _orange : _grayText,
                        ),
                      ),
                    ),
                  ),
                ),
                Expanded(
                  child: GestureDetector(
                    onTap: () => setState(() => _selectedTab = 1),
                    child: Container(
                      padding: const EdgeInsets.only(bottom: 12),
                      decoration: BoxDecoration(
                        border: Border(
                          bottom: BorderSide(
                            color: _selectedTab == 1 ? _orange : Colors.transparent,
                            width: 2,
                          ),
                        ),
                      ),
                      child: Text(
                        '卖出',
                        textAlign: TextAlign.center,
                        style: TextStyle(
                          fontSize: 14,
                          fontWeight: FontWeight.bold,
                          color: _selectedTab == 1 ? _orange : _grayText,
                        ),
                      ),
                    ),
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 24),
          // 价格输入
          _buildInputField('价格', _priceController, '请输入价格', '积分值'),
          const SizedBox(height: 16),
          // 数量输入
          _buildInputField('数量', _quantityController, '请输入数量', '积分股'),
          const SizedBox(height: 16),
          // 预计获得/支出
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: _bgGray,
              borderRadius: BorderRadius.circular(12),
            ),
            child: Row(
              mainAxisAlignment: MainAxisAlignment.spaceBetween,
              children: [
                Text(
                  _selectedTab == 0 ? '预计支出' : '预计获得',
                  style: const TextStyle(fontSize: 12, color: _grayText),
                ),
                Text(
                  _calculateEstimate(),
                  style: const TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.bold,
                    color: _orange,
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 16),
          // 销毁说明 (卖出时显示)
          if (_selectedTab == 1)
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 4),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: const [
                  Text(
                    '销毁比例',
                    style: TextStyle(fontSize: 12, color: _grayText),
                  ),
                  Text(
                    '10% 进入黑洞',
                    style: TextStyle(
                      fontSize: 12,
                      color: _red,
                      fontFamily: 'monospace',
                    ),
                  ),
                ],
              ),
            ),
          const SizedBox(height: 24),
          // 提交按钮
          SizedBox(
            width: double.infinity,
            height: 48,
            child: ElevatedButton(
              onPressed: _handleTrade,
              style: ElevatedButton.styleFrom(
                backgroundColor: _orange,
                shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.circular(12),
                ),
              ),
              child: Text(
                _selectedTab == 0 ? '买入积分股' : '卖出积分股',
                style: const TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                  color: Colors.white,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildInputField(
    String label,
    TextEditingController controller,
    String hint,
    String suffix,
  ) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(
          label,
          style: const TextStyle(
            fontSize: 12,
            fontWeight: FontWeight.w500,
            color: _grayText,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          height: 44,
          decoration: BoxDecoration(
            color: _bgGray,
            borderRadius: BorderRadius.circular(12),
          ),
          child: Row(
            children: [
              Expanded(
                child: TextField(
                  controller: controller,
                  keyboardType: const TextInputType.numberWithOptions(decimal: true),
                  decoration: InputDecoration(
                    hintText: hint,
                    hintStyle: const TextStyle(
                      fontSize: 14,
                      color: Color(0xFF9CA3AF),
                    ),
                    border: InputBorder.none,
                    contentPadding: const EdgeInsets.symmetric(horizontal: 16),
                  ),
                ),
              ),
              Text(suffix, style: const TextStyle(fontSize: 12, color: _grayText)),
              const SizedBox(width: 12),
            ],
          ),
        ),
      ],
    );
  }

  String _calculateEstimate() {
    final price = double.tryParse(_priceController.text) ?? 0;
    final quantity = double.tryParse(_quantityController.text) ?? 0;
    final total = price * quantity;

    if (total == 0) {
      return '0.00 积分值';
    }

    if (_selectedTab == 1) {
      // 卖出时扣除10%销毁
      final afterBurn = total * 0.9;
      return '${formatAmount(afterBurn.toString())} 积分值';
    }

    return '${formatAmount(total.toString())} 积分值';
  }

  Widget _buildMyOrdersCard(AsyncValue<OrdersPageModel?> ordersAsync) {
    final isLoading = ordersAsync.isLoading;
    final ordersPage = ordersAsync.valueOrNull;
    final orders = ordersPage?.data ?? [];

    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Column(
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Text(
                '我的挂单',
                style: TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.bold,
                  color: _darkText,
                ),
              ),
              GestureDetector(
                onTap: () {
                  // TODO: 查看全部挂单
                },
                child: const Text(
                  '全部 >',
                  style: TextStyle(
                    fontSize: 12,
                    fontWeight: FontWeight.w500,
                    color: _orange,
                  ),
                ),
              ),
            ],
          ),
          const SizedBox(height: 16),
          if (isLoading)
            const Center(
              child: Padding(
                padding: EdgeInsets.all(20),
                child: CircularProgressIndicator(color: _orange),
              ),
            )
          else if (orders.isEmpty)
            const Padding(
              padding: EdgeInsets.symmetric(vertical: 20),
              child: Text(
                '暂无挂单',
                style: TextStyle(fontSize: 14, color: _grayText),
              ),
            )
          else
            Column(
              children: orders.take(3).map((order) => Padding(
                padding: const EdgeInsets.only(bottom: 8),
                child: _buildOrderItemFromEntity(order),
              )).toList(),
            ),
        ],
      ),
    );
  }

  Widget _buildOrderItemFromEntity(TradeOrder order) {
    final isSell = order.isSell;
    final dateFormat = DateFormat('MM/dd HH:mm');
    final formattedDate = dateFormat.format(order.createdAt);

    String statusText;
    switch (order.status) {
      case OrderStatus.pending:
        statusText = '待成交';
        break;
      case OrderStatus.partial:
        statusText = '部分成交';
        break;
      case OrderStatus.filled:
        statusText = '已成交';
        break;
      case OrderStatus.cancelled:
        statusText = '已取消';
        break;
    }

    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: _lightGray,
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: _bgGray),
      ),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Container(
                    padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
                    decoration: BoxDecoration(
                      color: (isSell ? _red : _green).withValues(alpha: 0.1),
                      borderRadius: BorderRadius.circular(6),
                    ),
                    child: Text(
                      isSell ? '卖出' : '买入',
                      style: TextStyle(
                        fontSize: 12,
                        fontWeight: FontWeight.bold,
                        color: isSell ? _red : _green,
                      ),
                    ),
                  ),
                  const SizedBox(width: 8),
                  Text(
                    formatPrice(order.price),
                    style: const TextStyle(
                      fontSize: 14,
                      fontWeight: FontWeight.bold,
                      color: _darkText,
                    ),
                  ),
                ],
              ),
              const SizedBox(height: 4),
              Text(
                formattedDate,
                style: const TextStyle(fontSize: 12, color: _grayText),
              ),
            ],
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Text(
                '${formatCompact(order.quantity)} 股',
                style: const TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.w500,
                  color: _darkText,
                ),
              ),
              const SizedBox(height: 4),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 2),
                decoration: BoxDecoration(
                  color: _orange.withValues(alpha: 0.1),
                  borderRadius: BorderRadius.circular(9999),
                ),
                child: Text(
                  statusText,
                  style: const TextStyle(fontSize: 12, color: _orange),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _buildErrorCard(String message) {
    return Container(
      margin: const EdgeInsets.all(16),
      padding: const EdgeInsets.all(32),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(16),
      ),
      child: Center(
        child: Column(
          children: [
            const Icon(Icons.error_outline, size: 48, color: AppColors.error),
            const SizedBox(height: 8),
            Text(message),
          ],
        ),
      ),
    );
  }

  void _handleTrade() async {
    if (_priceController.text.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('请输入价格')),
      );
      return;
    }

    if (_quantityController.text.isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('请输入数量')),
      );
      return;
    }

    final isBuy = _selectedTab == 0;
    bool success;

    if (isBuy) {
      success = await ref
          .read(tradingNotifierProvider.notifier)
          .buyShares(_priceController.text, _quantityController.text);
    } else {
      success = await ref
          .read(tradingNotifierProvider.notifier)
          .sellShares(_priceController.text, _quantityController.text);
    }

    if (mounted) {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(success
              ? (isBuy ? '买入订单已提交' : '卖出订单已提交')
              : (isBuy ? '买入失败' : '卖出失败')),
          backgroundColor: success ? _green : AppColors.error,
        ),
      );
      if (success) {
        _quantityController.clear();
        // 交易成功后刷新订单列表
        ref.invalidate(ordersProvider);
        ref.invalidate(currentPriceProvider);
        ref.invalidate(marketOverviewProvider);
      }
    }
  }
}

// K线图绘制器（Y轴自适应，显示真实数据）
class _CandlestickPainter extends CustomPainter {
  final List<Kline> klines;

  _CandlestickPainter({required this.klines});

  @override
  void paint(Canvas canvas, Size size) {
    final greenPaint = Paint()..color = const Color(0xFF10B981);
    final redPaint = Paint()..color = const Color(0xFFEF4444);
    final gridPaint = Paint()
      ..color = const Color(0xFFE5E7EB)
      ..strokeWidth = 0.5;
    final textPaint = TextPainter(textDirection: ui.TextDirection.ltr);

    // 如果没有数据，显示提示
    if (klines.isEmpty) {
      textPaint.text = const TextSpan(
        text: '暂无K线数据',
        style: TextStyle(color: Color(0xFF6B7280), fontSize: 14),
      );
      textPaint.layout();
      textPaint.paint(
        canvas,
        Offset((size.width - textPaint.width) / 2, (size.height - textPaint.height) / 2),
      );
      return;
    }

    // 计算Y轴范围（自适应）
    double minPrice = double.infinity;
    double maxPrice = double.negativeInfinity;
    for (final kline in klines) {
      final low = double.tryParse(kline.low) ?? 0;
      final high = double.tryParse(kline.high) ?? 0;
      if (low < minPrice) minPrice = low;
      if (high > maxPrice) maxPrice = high;
    }

    // 添加一点余量，使K线不贴边
    final priceRange = maxPrice - minPrice;
    final padding = priceRange * 0.1; // 上下各留10%空间
    minPrice -= padding;
    maxPrice += padding;
    final adjustedRange = maxPrice - minPrice;

    // 绘图区域
    const leftPadding = 10.0;
    const rightPadding = 50.0; // 右侧留出价格标签空间
    const topPadding = 10.0;
    const bottomPadding = 10.0;
    final chartWidth = size.width - leftPadding - rightPadding;
    final chartHeight = size.height - topPadding - bottomPadding;

    // 绘制水平网格线和价格标签
    const gridLines = 4;
    for (int i = 0; i <= gridLines; i++) {
      final y = topPadding + (chartHeight / gridLines) * i;
      canvas.drawLine(
        Offset(leftPadding, y),
        Offset(size.width - rightPadding, y),
        gridPaint,
      );

      // 价格标签
      final price = maxPrice - (adjustedRange / gridLines) * i;
      final priceText = _formatPriceLabel(price);
      textPaint.text = TextSpan(
        text: priceText,
        style: const TextStyle(color: Color(0xFF6B7280), fontSize: 9),
      );
      textPaint.layout();
      textPaint.paint(canvas, Offset(size.width - rightPadding + 4, y - textPaint.height / 2));
    }

    // 计算K线宽度
    final candleWidth = chartWidth / klines.length;
    final bodyWidth = math.max(candleWidth * 0.6, 2.0); // 实体宽度，最小2px

    // 绘制K线
    for (int i = 0; i < klines.length; i++) {
      final kline = klines[i];
      final open = double.tryParse(kline.open) ?? 0;
      final close = double.tryParse(kline.close) ?? 0;
      final high = double.tryParse(kline.high) ?? 0;
      final low = double.tryParse(kline.low) ?? 0;

      final isGreen = close >= open;
      final paint = isGreen ? greenPaint : redPaint;

      final x = leftPadding + i * candleWidth + candleWidth / 2;

      // Y坐标转换（价格 -> 屏幕坐标）
      double priceToY(double price) {
        return topPadding + ((maxPrice - price) / adjustedRange) * chartHeight;
      }

      final yOpen = priceToY(open);
      final yClose = priceToY(close);
      final yHigh = priceToY(high);
      final yLow = priceToY(low);

      // 绘制影线
      canvas.drawLine(
        Offset(x, yHigh),
        Offset(x, yLow),
        paint..strokeWidth = 1,
      );

      // 绘制实体
      final bodyTop = math.min(yOpen, yClose);
      final bodyBottom = math.max(yOpen, yClose);
      // 确保实体至少有1px高度
      final minBodyHeight = 1.0;
      final actualBodyBottom = bodyBottom - bodyTop < minBodyHeight ? bodyTop + minBodyHeight : bodyBottom;

      canvas.drawRect(
        Rect.fromLTRB(x - bodyWidth / 2, bodyTop, x + bodyWidth / 2, actualBodyBottom),
        paint..style = PaintingStyle.fill,
      );
    }

    // 绘制最新价格虚线
    if (klines.isNotEmpty) {
      final lastClose = double.tryParse(klines.last.close) ?? 0;
      final lastY = topPadding + ((maxPrice - lastClose) / adjustedRange) * chartHeight;

      final dashPaint = Paint()
        ..color = const Color(0xFFFF6B00)
        ..strokeWidth = 1
        ..style = PaintingStyle.stroke;

      const dashWidth = 5.0;
      const dashSpace = 3.0;
      double startX = leftPadding;
      while (startX < size.width - rightPadding) {
        canvas.drawLine(
          Offset(startX, lastY),
          Offset(math.min(startX + dashWidth, size.width - rightPadding), lastY),
          dashPaint,
        );
        startX += dashWidth + dashSpace;
      }
    }
  }

  // 格式化价格标签
  String _formatPriceLabel(double price) {
    if (price >= 1) {
      return price.toStringAsFixed(4);
    } else if (price >= 0.0001) {
      return price.toStringAsFixed(6);
    } else {
      return price.toStringAsExponential(2);
    }
  }

  @override
  bool shouldRepaint(covariant _CandlestickPainter oldDelegate) {
    return oldDelegate.klines != klines;
  }
}