import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'package:k_chart/flutter_k_chart.dart';
import '../../../core/theme/app_theme.dart';
import '../../../core/theme/app_theme_extension.dart';
import '../../../core/theme/app_spacing.dart';
import '../../../data/models/coin.dart';
import '../../../providers/kline_provider.dart';
import '../main/main_page.dart';
import 'components/interval_selector.dart';
import 'components/kline_stats_bar.dart';

/// K线图表页面
class KlinePage extends StatefulWidget {
  final Coin coin;

  const KlinePage({super.key, required this.coin});

  @override
  State<KlinePage> createState() => _KlinePageState();
}

class _KlinePageState extends State<KlinePage> {
  List<KLineEntity>? _kLineEntities;
  final ChartColors _chartColors = ChartColors();
  final ChartStyle _chartStyle = ChartStyle();

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    final isDark = context.isDark;
    _chartColors.bgColor = [isDark ? const Color(0xff1a1a2e) : Colors.white, isDark ? const Color(0xff1a1a2e) : Colors.white];
    _chartColors.gridColor = isDark ? const Color(0xff2d2d44) : const Color(0xffe0e0e0);
    _chartColors.upColor = context.appColors.up;
    _chartColors.dnColor = context.appColors.down;

    return Scaffold(
      backgroundColor: context.colors.background,
      appBar: AppBar(
        backgroundColor: context.colors.surface,
        elevation: 0,
        scrolledUnderElevation: 0,
        leading: IconButton(
          icon: Icon(LucideIcons.arrowLeft, color: context.colors.onSurface),
          onPressed: () => Navigator.of(context).pop(),
        ),
        title: Row(
          children: [
            Text(widget.coin.code,
                style: AppTextStyles.headlineLarge(context).copyWith(
                  fontWeight: FontWeight.bold,
                )),
            const SizedBox(width: 8),
            Text(widget.coin.formattedPrice,
                style: AppTextStyles.headlineMedium(context).copyWith(
                  color: context.colors.primary,
                )),
            const SizedBox(width: 6),
            _ChangeBadge(coin: widget.coin),
          ],
        ),
      ),
      body: Consumer<KlineProvider>(
        builder: (context, provider, _) {
          // 数据转换
          _updateEntities(provider);

          return Column(
            children: [
              // 周期选择器
              Padding(
                padding: const EdgeInsets.symmetric(
                  horizontal: AppSpacing.md,
                  vertical: AppSpacing.sm,
                ),
                child: IntervalSelector(
                  selected: provider.interval,
                  onChanged: (v) => provider.changeInterval(v),
                ),
              ),
              // OHLC 信息栏
              KlineStatsBar(candle: provider.currentCandle),
              const Divider(height: 1),
              // K线图表
              Expanded(
                child: _buildChart(provider),
              ),
              // 底部操作栏
              _BottomActionBar(coin: widget.coin),
            ],
          );
        },
      ),
    );
  }

  void _updateEntities(KlineProvider provider) {
    final allCandles = [...provider.candles];
    if (provider.currentCandle != null) {
      allCandles.add(provider.currentCandle!);
    }

    if (allCandles.isEmpty) {
      _kLineEntities = null;
      return;
    }

    _kLineEntities = allCandles.map((c) {
      return KLineEntity.fromJson({
        'open': c.openPrice,
        'high': c.highPrice,
        'low': c.lowPrice,
        'close': c.closePrice,
        'vol': c.volume,
        'amount': c.closePrice * c.volume,
        'time': c.openTime,
        'id': c.openTime,
      });
    }).toList();

    DataUtil.calculate(_kLineEntities!);
  }

  Widget _buildChart(KlineProvider provider) {
    if (provider.isLoading) {
      return const Center(child: CircularProgressIndicator());
    }

    if (_kLineEntities == null || _kLineEntities!.isEmpty) {
      return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(LucideIcons.chartNoAxesColumn,
                size: 48,
                color: context.appColors.onSurfaceMuted.withValues(alpha: 0.4)),
            const SizedBox(height: AppSpacing.md),
            Text('暂无K线数据',
                style: AppTextStyles.headlineMedium(context).copyWith(
                  color: context.appColors.onSurfaceMuted,
                )),
            const SizedBox(height: AppSpacing.sm),
          ],
        ),
      );
    }

    return Stack(
      children: [
        SizedBox(
          height: double.infinity,
          width: double.infinity,
          child: KChartWidget(
            _kLineEntities,
            _chartStyle,
            _chartColors,
            isLine: false,
            isTrendLine: false,
            mainState: MainState.MA,
            volHidden: false,
            secondaryState: SecondaryState.MACD,
            fixedLength: 4,
            timeFormat: TimeFormat.YEAR_MONTH_DAY,
            showNowPrice: true,
            hideGrid: false,
            isTapShowInfoDialog: false,
            onSecondaryTap: () {},
          ),
        ),
      ],
    );
  }
}

/// 涨跌标签
class _ChangeBadge extends StatelessWidget {
  final Coin coin;
  const _ChangeBadge({required this.coin});

  @override
  Widget build(BuildContext context) {
    final isUp = coin.isUp;
    final color = isUp ? context.appColors.up : context.appColors.down;
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 6, vertical: 2),
      decoration: BoxDecoration(
        color: color.withValues(alpha: 0.1),
        borderRadius: BorderRadius.circular(4),
      ),
      child: Text(
        coin.formattedChange,
        style: AppTextStyles.bodySmall(context).copyWith(
          color: color,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }
}

/// 底部交易操作栏
class _BottomActionBar extends StatelessWidget {
  final Coin coin;
  const _BottomActionBar({required this.coin});

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.fromLTRB(
        AppSpacing.lg, AppSpacing.sm, AppSpacing.lg, AppSpacing.lg,
      ),
      decoration: BoxDecoration(
        color: context.colors.surface,
        border: Border(
          top: BorderSide(
            color: context.colors.outlineVariant.withValues(alpha: 0.2),
          ),
        ),
      ),
      child: Row(
        children: [
          Expanded(
            child: SizedBox(
              height: 44,
              child: ElevatedButton(
                onPressed: () => _navigateToTrade(context, isBuy: true),
                style: ElevatedButton.styleFrom(
                  backgroundColor: context.appColors.up,
                  foregroundColor: Colors.white,
                  elevation: 0,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(AppRadius.lg),
                  ),
                ),
                child: Text('买入',
                    style: AppTextStyles.headlineMedium(context).copyWith(
                      color: Colors.white,
                      fontWeight: FontWeight.bold,
                    )),
              ),
            ),
          ),
          const SizedBox(width: AppSpacing.md),
          Expanded(
            child: SizedBox(
              height: 44,
              child: ElevatedButton(
                onPressed: () => _navigateToTrade(context, isBuy: false),
                style: ElevatedButton.styleFrom(
                  backgroundColor: context.appColors.down,
                  foregroundColor: Colors.white,
                  elevation: 0,
                  shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(AppRadius.lg),
                  ),
                ),
                child: Text('卖出',
                    style: AppTextStyles.headlineMedium(context).copyWith(
                      color: Colors.white,
                      fontWeight: FontWeight.bold,
                    )),
              ),
            ),
          ),
        ],
      ),
    );
  }

  void _navigateToTrade(BuildContext context, {required bool isBuy}) {
    Navigator.of(context).pop();
    final mainState = context.findAncestorStateOfType<MainPageState>();
    mainState?.switchToTrade(coin.code);
  }
}