import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:hooks_riverpod/hooks_riverpod.dart';
import 'package:shadcn_ui/shadcn_ui.dart';

import '../../../common/domain/money.dart';
import '../../../common/push/notification_permission.dart';
import '../../../common/push/umeng_push_service.dart';
import '../../../common/widgets/adaptive.dart';
import '../../ads/application/startup_ad_service.dart';
import '../../ads/presentation/home_ad_banner.dart';
import '../../settings/application/update_controller.dart';
import '../../settings/application/update_service.dart';
import '../application/asset_portfolio_controller.dart';

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

  @override
  ConsumerState<AssetsPage> createState() => _AssetsPageState();
}

class _AssetsPageState extends ConsumerState<AssetsPage> {
  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addPostFrameCallback((_) {
      unawaited(_completeColdLaunch());
    });
  }

  Future<void> _completeColdLaunch() async {
    if (!mounted) return;
    await StartupAdService.showIfAvailable(context, ref);
    if (!mounted) return;
    await _checkColdLaunchUpgrade();
    if (mounted) await _requestNotificationPermission();
  }

  Future<void> _requestNotificationPermission() async {
    if (!mounted) return;
    if (defaultTargetPlatform == TargetPlatform.iOS) {
      // 研听的 U-Push register 会请求 APNs；这里再以系统 API 兜底，避免
      // 旧安装已跳过欢迎页时永远不触发首次通知授权。iOS 不展示顶部说明。
      await NotificationPermission.requestFromSettings();
    } else {
      await NotificationPermission.requestIfNeeded(context);
    }
    await UmengPushService.refreshDeviceToken();
  }

  Future<void> _checkColdLaunchUpgrade() async {
    if (!mounted ||
        !UpdateService.isSupported ||
        !ref.read(updateSessionGateProvider).takeColdLaunchSlot()) {
      return;
    }
    try {
      final upgrade = await ref
          .read(updateControllerProvider.notifier)
          .checkUpgrade();
      if (!mounted) return;
      await UpdateService.showIfNeeded(
        context,
        ref,
        upgrade,
        source: UpgradeCheckSource.automatic,
      );
    } catch (_) {
      // Automatic update checks must never block the assets home page.
    }
  }

  @override
  Widget build(BuildContext context) {
    final summary = ref.watch(assetPortfolioControllerProvider);
    final cs = ShadTheme.of(context).colorScheme;
    return SafeArea(
      top: false,
      child: ListView(
        padding: const EdgeInsets.fromLTRB(18, 18, 18, 24),
        children: [
          Center(
            child: ConstrainedBox(
              constraints: const BoxConstraints(
                maxWidth: Adaptive.contentMaxWidth,
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: [
                  _Card(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text('我的贵金属总估值', style: _mutedStyle(cs)),
                        const SizedBox(height: 10),
                        Text(
                          formatCny(summary.totalValue),
                          style: TextStyle(
                            fontSize: 34,
                            fontWeight: FontWeight.w800,
                            color: cs.foreground,
                            letterSpacing: 0,
                          ),
                        ),
                        const SizedBox(height: 8),
                        Text(
                          '今日 ${formatCny(summary.todayChangeAmount)} · ${summary.todayChangePercent.toStringAsFixed(2)}%',
                          style: TextStyle(
                            fontSize: 13,
                            color: summary.todayChangeAmount >= 0
                                ? const Color(0xFFC0392B)
                                : const Color(0xFF2E8B6F),
                          ),
                        ),
                      ],
                    ),
                  ),
                  const SizedBox(height: 12),
                  Wrap(
                    spacing: 8,
                    runSpacing: 8,
                    children: [
                      for (final item in summary.breakdowns)
                        Chip(
                          label: Text(
                            '${item.metal.shortLabel} ${formatCny(item.value)}',
                          ),
                          avatar: CircleAvatar(
                            backgroundColor: item.metal.color,
                          ),
                        ),
                    ],
                  ),
                  const SizedBox(height: 12),
                  const HomeAdBanner(),
                  const SizedBox(height: 12),
                  _Card(
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          '我的持仓 · ${summary.holdings.length} 件 · ${formatGram(summary.totalWeightGram)}',
                          style: TextStyle(
                            fontSize: 15,
                            fontWeight: FontWeight.w700,
                            color: cs.foreground,
                          ),
                        ),
                        const SizedBox(height: 12),
                        for (final item in summary.holdings)
                          Padding(
                            padding: const EdgeInsets.symmetric(vertical: 8),
                            child: Row(
                              children: [
                                Expanded(
                                  child: Text(
                                    '${item.holding.name} · ${item.holding.purityLabel} · ${formatGram(item.holding.weightGram)}',
                                    style: TextStyle(color: cs.foreground),
                                  ),
                                ),
                                Text(formatCny(item.materialValue)),
                              ],
                            ),
                          ),
                      ],
                    ),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _Card extends StatelessWidget {
  const _Card({required this.child});

  final Widget child;

  @override
  Widget build(BuildContext context) {
    final cs = ShadTheme.of(context).colorScheme;
    return DecoratedBox(
      decoration: BoxDecoration(
        color: cs.card,
        border: Border.all(color: cs.border),
        borderRadius: BorderRadius.circular(12),
      ),
      child: Padding(padding: const EdgeInsets.all(16), child: child),
    );
  }
}

TextStyle _mutedStyle(ShadColorScheme cs) {
  return TextStyle(fontSize: 13, color: cs.mutedForeground, letterSpacing: 0);
}