import 'package:flutter/material.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'package:provider/provider.dart';
import 'package:flutter_animate/flutter_animate.dart';
import '../../../core/theme/app_color_scheme.dart';
import '../../../core/theme/app_spacing.dart';
import '../../../providers/asset_provider.dart';
import '../../../providers/auth_provider.dart';
import '../../shared/ui_constants.dart';

/// 首页 - 使用 shadcn_ui 现代化设计
class HomePage extends StatefulWidget {
  const HomePage({super.key});

  @override
  State<HomePage> createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> with AutomaticKeepAliveClientMixin {
  @override
  bool get wantKeepAlive => true;

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) => _loadData());
  }

  void _loadData() {
    final provider = context.read<AssetProvider>();
    provider.loadOverview();
    provider.loadTradeAccount();
  }

  @override
  Widget build(BuildContext context) {
    super.build(context);
    final theme = ShadTheme.of(context);

    return Scaffold(
      backgroundColor: theme.colorScheme.background,
      body: Consumer<AssetProvider>(
        builder: (context, provider, _) {
          return RefreshIndicator(
            onRefresh: () => provider.refreshAll(force: true),
            color: theme.colorScheme.primary,
            child: SingleChildScrollView(
              physics: const AlwaysScrollableScrollPhysics(),
              padding: AppSpacing.pagePadding,
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  SizedBox(height: AppSpacing.sm),
                  _Header(),
                  SizedBox(height: AppSpacing.lg + AppSpacing.sm),
                  _AssetOverviewCard(overview: provider.overview),
                  SizedBox(height: AppSpacing.md),
                  _QuickActions(
                    onDeposit: _showDeposit,
                    onWithdraw: _showWithdraw,
                    onTransfer: _showTransfer,
                    onTrade: _navigateToTrade,
                  ),
                  SizedBox(height: AppSpacing.lg),
                  _HoldingsList(holdings: provider.holdings),
                ],
              ),
            ),
          );
        },
      ),
    );
  }

  void _showDeposit() => _showAmountDialog('充值', (amount) {
    context.read<AssetProvider>().deposit(amount: amount);
  });

  void _showWithdraw() {
    final amountController = TextEditingController();
    final addressController = TextEditingController();
    final contactController = TextEditingController();
    final formKey = GlobalKey<ShadFormState>();

    showShadDialog(
      context: context,
      builder: (ctx) => ShadDialog(
        title: const Text('提现'),
        child: ShadForm(
          key: formKey,
          child: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              ShadInputFormField(
                id: 'amount',
                placeholder: const Text('请输入提现金额(USDT)'),
                controller: amountController,
                keyboardType: const TextInputType.numberWithOptions(decimal: true),
                validator: Validators.amount,
              ),
              SizedBox(height: AppSpacing.sm + AppSpacing.xs),
              ShadInputFormField(
                id: 'address',
                placeholder: const Text('请输入提现地址'),
                controller: addressController,
                validator: (v) => Validators.required(v, '提现地址'),
              ),
              SizedBox(height: AppSpacing.sm + AppSpacing.xs),
              ShadInputFormField(
                id: 'contact',
                placeholder: const Text('联系方式(可选)'),
                controller: contactController,
              ),
            ],
          ),
        ),
        actions: [
          ShadButton.outline(child: const Text('取消'), onPressed: () => Navigator.of(ctx).pop()),
          ShadButton(
            child: const Text('确认'),
            onPressed: () {
              if (formKey.currentState!.saveAndValidate()) {
                Navigator.of(ctx).pop();
                context.read<AssetProvider>().withdraw(
                  amount: amountController.text.trim(),
                  withdrawAddress: addressController.text.trim(),
                  withdrawContact: contactController.text.trim().isEmpty ? null : contactController.text.trim(),
                );
              }
            },
          ),
        ],
      ),
    );
  }

  void _showTransfer() => _showAmountDialog('划转', (amount) {
    context.read<AssetProvider>().transfer(direction: 1, amount: amount);
  });

  void _showAmountDialog(String title, Function(String) onSubmit) {
    final controller = TextEditingController();
    final formKey = GlobalKey<ShadFormState>();

    showShadDialog(
      context: context,
      builder: (ctx) => ShadDialog(
        title: Text(title),
        child: ShadForm(
          key: formKey,
          child: ShadInputFormField(
            id: 'amount',
            placeholder: Text('请输入${title}金额(USDT)'),
            controller: controller,
            keyboardType: const TextInputType.numberWithOptions(decimal: true),
            validator: Validators.amount,
          ),
        ),
        actions: [
          ShadButton.outline(child: const Text('取消'), onPressed: () => Navigator.of(ctx).pop()),
          ShadButton(
            child: const Text('确认'),
            onPressed: () {
              if (formKey.currentState!.saveAndValidate()) {
                onSubmit(controller.text);
                Navigator.of(ctx).pop();
              }
            },
          ),
        ],
      ),
    );
  }

  void _navigateToTrade() {
    // 切换到交易页 - 通过 MainController
  }
}

/// 头部组件
class _Header extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return Consumer<AuthProvider>(
      builder: (context, auth, _) {
        final user = auth.user;
        return Row(
          children: [
            _Avatar(text: user?.avatarText),
            SizedBox(width: AppSpacing.sm + AppSpacing.xs),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    '你好，${user?.username ?? '用户'}',
                    style: theme.textTheme.large.copyWith(fontWeight: FontWeight.bold),
                  ),
                  SizedBox(height: AppSpacing.xs),
                  Text('欢迎来到模拟所', style: theme.textTheme.muted),
                ],
              ),
            ),
          ],
        ).animate().fadeIn(duration: 300.ms).slideX(begin: -0.1, end: 0);
      },
    );
  }
}

/// 头像组件
class _Avatar extends StatelessWidget {
  final String? text;

  const _Avatar({this.text});

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return CircleAvatar(
      radius: 20,
      backgroundColor: theme.colorScheme.primary.withValues(alpha: 0.2),
      child: Text(
        text ?? 'U',
        style: TextStyle(color: theme.colorScheme.primary, fontWeight: FontWeight.bold),
      ),
    );
  }
}

/// 资产总览卡片
class _AssetOverviewCard extends StatelessWidget {
  final dynamic overview;

  const _AssetOverviewCard({required this.overview});

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return Container(
      width: double.infinity,
      padding: EdgeInsets.all(AppSpacing.lg + AppSpacing.sm),
      decoration: BoxDecoration(
        gradient: AppColorScheme.assetCardGradient,
        borderRadius: BorderRadius.circular(AppRadius.xl),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text('总资产(USDT)', style: theme.textTheme.small.copyWith(color: Colors.white70)),
          SizedBox(height: AppSpacing.sm),
          Text(
            overview?.totalAsset ?? '0.00',
            style: theme.textTheme.h2.copyWith(color: Colors.white, fontWeight: FontWeight.bold),
          ),
          SizedBox(height: AppSpacing.lg + AppSpacing.sm),
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              _AssetItem(label: '资金账户', value: overview?.fundBalance ?? '0.00'),
              _AssetItem(label: '交易账户', value: overview?.tradeBalance ?? '0.00'),
            ],
          ),
        ],
      ),
    ).animate().fadeIn(duration: 400.ms).slideY(begin: 0.1, end: 0);
  }
}

/// 资产项
class _AssetItem extends StatelessWidget {
  final String label;
  final String value;

  const _AssetItem({required this.label, required this.value});

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Text(label, style: const TextStyle(fontSize: 12, color: Colors.white70)),
        SizedBox(height: AppSpacing.xs),
        Text(value, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: Colors.white)),
      ],
    );
  }
}

/// 快捷操作
class _QuickActions extends StatelessWidget {
  final VoidCallback onDeposit;
  final VoidCallback onWithdraw;
  final VoidCallback onTransfer;
  final VoidCallback onTrade;

  const _QuickActions({
    required this.onDeposit,
    required this.onWithdraw,
    required this.onTransfer,
    required this.onTrade,
  });

  @override
  Widget build(BuildContext context) {
    return ShadCard(
      padding: AppSpacing.cardPadding,
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceAround,
        children: [
          _ActionButton(icon: LucideIcons.arrowDownToLine, text: '充值', color: AppColorScheme.success, onTap: onDeposit),
          _ActionButton(icon: LucideIcons.arrowUpFromLine, text: '提现', color: AppColorScheme.warning, onTap: onWithdraw),
          _ActionButton(icon: LucideIcons.arrowRightLeft, text: '划转', color: AppColorScheme.info, onTap: onTransfer),
          _ActionButton(icon: LucideIcons.trendingUp, text: '交易', color: AppColorScheme.info, onTap: onTrade),
        ],
      ),
    ).animate().fadeIn(duration: 500.ms, delay: 100.ms);
  }
}

/// 操作按钮
class _ActionButton extends StatelessWidget {
  final IconData icon;
  final String text;
  final Color color;
  final VoidCallback onTap;

  const _ActionButton({
    required this.icon,
    required this.text,
    required this.color,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return GestureDetector(
      onTap: onTap,
      child: Column(
        children: [
          Container(
            width: 48,
            height: 48,
            decoration: BoxDecoration(color: color.withValues(alpha: 0.15), shape: BoxShape.circle),
            child: Icon(icon, color: color, size: 22),
          ),
          SizedBox(height: AppSpacing.sm),
          Text(text, style: TextStyle(fontSize: 12, color: theme.colorScheme.foreground)),
        ],
      ),
    );
  }
}

/// 持仓列表
class _HoldingsList extends StatelessWidget {
  final List<dynamic> holdings;

  const _HoldingsList({required this.holdings});

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return ShadCard(
      padding: AppSpacing.cardPadding,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text('我的持仓', style: theme.textTheme.large.copyWith(fontWeight: FontWeight.bold)),
              Icon(LucideIcons.chevronRight, color: theme.colorScheme.mutedForeground, size: 20),
            ],
          ),
          SizedBox(height: AppSpacing.md),
          if (holdings.isEmpty)
            _EmptyHoldings()
          else
            _HoldingsListView(holdings: holdings),
        ],
      ),
    ).animate().fadeIn(duration: 500.ms, delay: 200.ms);
  }
}

/// 空持仓提示
class _EmptyHoldings extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return Center(
      child: Padding(
        padding: EdgeInsets.all(AppSpacing.xl),
        child: Column(
          children: [
            Icon(LucideIcons.wallet, size: 48, color: theme.colorScheme.mutedForeground),
            SizedBox(height: AppSpacing.sm + AppSpacing.xs),
            Text('暂无持仓', style: theme.textTheme.muted),
            SizedBox(height: AppSpacing.xs),
            Text('快去交易吧~', style: theme.textTheme.muted.copyWith(fontSize: 12)),
          ],
        ),
      ),
    );
  }
}

/// 持仓列表视图
class _HoldingsListView extends StatelessWidget {
  final List<dynamic> holdings;

  const _HoldingsListView({required this.holdings});

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);
    final displayHoldings = holdings.length > 5 ? holdings.sublist(0, 5) : holdings;

    return ListView.separated(
      shrinkWrap: true,
      physics: const NeverScrollableScrollPhysics(),
      itemCount: displayHoldings.length,
      separatorBuilder: (_, __) => Divider(color: theme.colorScheme.border, height: 1),
      itemBuilder: (context, index) {
        return _HoldingItem(holding: displayHoldings[index])
            .animate()
            .fadeIn(delay: Duration(milliseconds: 50 * index));
      },
    );
  }
}

/// 持仓项
class _HoldingItem extends StatelessWidget {
  final dynamic holding;

  const _HoldingItem({required this.holding});

  @override
  Widget build(BuildContext context) {
    final theme = ShadTheme.of(context);

    return Padding(
      padding: EdgeInsets.symmetric(vertical: AppSpacing.sm),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Row(
            children: [
              CircleAvatar(
                radius: 18,
                backgroundColor: theme.colorScheme.primary.withValues(alpha: 0.1),
                child: Text(
                  holding.coinCode.substring(0, 1),
                  style: TextStyle(color: theme.colorScheme.primary, fontWeight: FontWeight.bold),
                ),
              ),
              SizedBox(width: AppSpacing.sm + AppSpacing.xs),
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(holding.coinCode, style: theme.textTheme.large.copyWith(fontWeight: FontWeight.bold)),
                  Text(holding.quantity, style: theme.textTheme.muted),
                ],
              ),
            ],
          ),
          Column(
            crossAxisAlignment: CrossAxisAlignment.end,
            children: [
              Text('${holding.currentValue} USDT', style: theme.textTheme.small.copyWith(fontWeight: FontWeight.w500)),
              Text(
                holding.formattedProfitRate,
                style: TextStyle(
                  color: holding.isProfit ? AppColorScheme.up : AppColorScheme.down,
                  fontSize: 12,
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }
}