import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../core/navigation_provider.dart';
import '../providers/auth_provider.dart';
import '../providers/data_providers.dart';
import '../providers/chat_provider.dart';

/// 侧滑抽屉——健康概览 + 历史对话 + 菜单
class HealthDrawer extends ConsumerWidget {
  const HealthDrawer({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    final auth = ref.watch(authProvider);
    final user = auth.user;
    final latestHealth = ref.watch(latestHealthProvider);
    final conversations = ref.watch(conversationListProvider);

    return Drawer(
      width: MediaQuery.of(context).size.width * 0.8,
      child: SafeArea(
        child: ListView(
          padding: EdgeInsets.zero,
          children: [
            // 用户信息
            Container(
              padding: const EdgeInsets.all(20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  GestureDetector(
                    onTap: () => pushRoute(ref, 'profile'),
                    child: CircleAvatar(
                      radius: 28,
                      backgroundColor: const Color(0xFFE6FAF6),
                      child: Icon(Icons.person, size: 32, color: Theme.of(context).colorScheme.primary),
                    ),
                  ),
                  const SizedBox(height: 12),
                  Text(user?.name ?? '未设置昵称', style: Theme.of(context).textTheme.titleMedium),
                  if (user != null) const SizedBox(height: 4),
                  Text(user?.phone ?? '', style: Theme.of(context).textTheme.labelMedium),
                ],
              ),
            ),
            // 健康概览——接真实数据
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
              child: Text('健康概览', style: Theme.of(context).textTheme.labelMedium!.copyWith(fontWeight: FontWeight.w600)),
            ),
            latestHealth.when(
              data: (data) => Padding(
                padding: const EdgeInsets.symmetric(horizontal: 12),
                child: Wrap(
                  spacing: 8,
                  runSpacing: 8,
                  children: [
                    _HealthMetricChip(icon: Icons.favorite, label: '血压', value: _bpText(data['BloodPressure']), onTap: () => pushRoute(ref, 'trend', params: {'type': 'blood_pressure'})),
                    _HealthMetricChip(icon: Icons.monitor_heart, label: '心率', value: _metricText(data['HeartRate'], ''), onTap: () => pushRoute(ref, 'trend', params: {'type': 'heart_rate'})),
                    _HealthMetricChip(icon: Icons.bloodtype, label: '血糖', value: _metricText(data['Glucose'], ''), onTap: () => pushRoute(ref, 'trend', params: {'type': 'glucose'})),
                    _HealthMetricChip(icon: Icons.air, label: '血氧', value: _metricText(data['SpO2'], '%'), onTap: () => pushRoute(ref, 'trend', params: {'type': 'spo2'})),
                    _HealthMetricChip(icon: Icons.monitor_weight, label: '体重', value: _metricText(data['Weight'], 'kg'), onTap: () => pushRoute(ref, 'trend', params: {'type': 'weight'})),
                  ],
                ),
              ),
              loading: () => const Padding(padding: EdgeInsets.all(16), child: Center(child: SizedBox(width: 20, height: 20, child: CircularProgressIndicator(strokeWidth: 2)))),
              error: (_, _) => Padding(
                padding: const EdgeInsets.symmetric(horizontal: 12),
                child: Wrap(
                  spacing: 8,
                  runSpacing: 8,
                  children: [
                    const _HealthMetricChip(icon: Icons.favorite, label: '血压', value: '--'),
                    const _HealthMetricChip(icon: Icons.monitor_heart, label: '心率', value: '--'),
                    const _HealthMetricChip(icon: Icons.bloodtype, label: '血糖', value: '--'),
                    const _HealthMetricChip(icon: Icons.air, label: '血氧', value: '--'),
                    const _HealthMetricChip(icon: Icons.monitor_weight, label: '体重', value: '--'),
                  ],
                ),
              ),
            ),

            const Divider(),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
              child: Text('功能', style: Theme.of(context).textTheme.labelMedium!.copyWith(fontWeight: FontWeight.w600)),
            ),
            _DrawerItem(icon: Icons.description, label: '报告管理', onTap: () => pushRoute(ref, 'reports')),
            _DrawerItem(icon: Icons.calendar_today, label: '健康日历', onTap: () => pushRoute(ref, 'calendar')),
            _DrawerItem(icon: Icons.restaurant, label: '饮食记录', onTap: () => pushRoute(ref, 'dietRecords')),
            _DrawerItem(icon: Icons.event_note, label: '复查随访', onTap: () => pushRoute(ref, 'followups')),
            const Divider(),
            Padding(
              padding: const EdgeInsets.symmetric(horizontal: 20, vertical: 8),
              child: Row(children: [
                Text('历史对话', style: Theme.of(context).textTheme.labelMedium!.copyWith(fontWeight: FontWeight.w600)),
                const Spacer(),
                TextButton(onPressed: () => ref.invalidate(conversationListProvider), child: const Text('刷新', style: TextStyle(fontSize: 12, color: Color(0xFF14B8A6)))),
              ]),
            ),
            conversations.when(
                data: (items) {
                  if (items.isEmpty) {
                    return const Padding(padding: EdgeInsets.symmetric(vertical: 20), child: Center(child: Text('暂无历史对话', style: TextStyle(color: Color(0xFF999999), fontSize: 13))));
                  }
                  return Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 8),
                    child: Column(
                      mainAxisSize: MainAxisSize.min,
                      children: items.map((item) => _ConversationItem(item: item, ref: ref)).toList(),
                    ),
                  );
                },
                loading: () => const Center(child: CircularProgressIndicator(strokeWidth: 2)),
                error: (_, __) => const Center(child: Text('加载失败', style: TextStyle(color: Color(0xFF999999), fontSize: 14))),
              ),

            const Divider(),
            _DrawerItem(icon: Icons.settings, label: '设置', onTap: () => pushRoute(ref, 'settings')),
          ],
        ),
      ),
    );
  }

  String _bpText(dynamic bp) {
    if (bp == null) return '--';
    if (bp is Map) return '${bp['systolic'] ?? '--'}/${bp['diastolic'] ?? '--'}';
    return '--';
  }

  String _metricText(dynamic metric, String unit) {
    if (metric == null) return '--';
    if (metric is Map) {
      final v = metric['value'];
      return v != null ? '$v $unit' : '--';
    }
    return '--';
  }
}

class _DrawerItem extends StatelessWidget {
  final IconData icon; final String label; final VoidCallback onTap;
  const _DrawerItem({required this.icon, required this.label, required this.onTap});
  @override Widget build(BuildContext context) => ListTile(leading: Icon(icon, size: 20, color: const Color(0xFF666666)), title: Text(label, style: const TextStyle(fontSize: 16)), onTap: onTap, dense: true);
}

class _HealthMetricChip extends StatelessWidget {
  final IconData icon;
  final String label;
  final String value;
  final VoidCallback? onTap;

  const _HealthMetricChip({required this.icon, required this.label, required this.value, this.onTap});

  @override
  Widget build(BuildContext context) => GestureDetector(
    onTap: onTap,
    child: Container(
      width: 80,
      padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 6),
      decoration: BoxDecoration(
        color: Colors.white,
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: const Color(0xFFE6FAF6)),
      ),
      child: Row(mainAxisSize: MainAxisSize.min, children: [
        Icon(icon, size: 14, color: const Color(0xFF14B8A6)),
        const SizedBox(width: 4),
        Column(crossAxisAlignment: CrossAxisAlignment.start, mainAxisSize: MainAxisSize.min, children: [
          Text(label, style: TextStyle(fontSize: 10, color: Colors.grey[600])),
          Text(value, style: const TextStyle(fontSize: 13, fontWeight: FontWeight.w600, color: Color(0xFF1A1A1A))),
        ]),
      ]),
    ),
  );
}

class _ConversationItem extends ConsumerWidget {
  final ConversationItem item;
  final WidgetRef ref;
  const _ConversationItem({required this.item, required this.ref});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return Container(
      margin: const EdgeInsets.symmetric(horizontal: 4, vertical: 2),
      decoration: BoxDecoration(
        color: const Color(0xFFF6F9FB),
        borderRadius: BorderRadius.circular(10),
      ),
      child: ListTile(
        leading: Container(
          width: 28,
          height: 28,
          decoration: BoxDecoration(
            color: const Color(0xFFE6FAF6),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Icon(_getAgentIcon(item.agent), size: 14, color: const Color(0xFF14B8A6)),
        ),
        title: Text(item.title, maxLines: 1, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w500)),
        subtitle: Text(item.lastMessage, maxLines: 1, overflow: TextOverflow.ellipsis, style: TextStyle(fontSize: 10, color: Colors.grey[500])),
        trailing: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          mainAxisSize: MainAxisSize.min,
          children: [
            Text(_formatTime(item.updatedAt), style: const TextStyle(fontSize: 9, color: Color(0xFFCCCCCC))),
            PopupMenuButton<int>(
              icon: const Icon(Icons.more_vert, size: 12, color: Color(0xFFCCCCCC)),
              itemBuilder: (_) => [
                const PopupMenuItem(value: 1, child: Text('继续聊')),
                const PopupMenuItem(value: 2, child: Text('删除')),
              ],
              onSelected: (v) async {
                if (v == 1) {
                  ref.read(chatProvider.notifier).setAgent(item.agent);
                  Navigator.pop(context);
                } else if (v == 2) {
                  final ok = await showDialog<bool>(
                    context: context,
                    builder: (ctx) => AlertDialog(
                      title: const Text('删除对话'),
                      content: const Text('确定删除该对话？'),
                      actions: [
                        TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('取消')),
                        TextButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('确定')),
                      ],
                    ),
                  );
                  if (ok == true) {
                    ref.invalidate(conversationListProvider);
                  }
                }
              },
            ),
          ],
        ),
        onTap: () {
          ref.read(chatProvider.notifier).setAgent(item.agent);
          Navigator.pop(context);
        },
        dense: true,
      ),
    );
  }

  IconData _getAgentIcon(ActiveAgent agent) {
    switch (agent) {
      case ActiveAgent.health: return Icons.health_and_safety;
      case ActiveAgent.diet: return Icons.restaurant;
      case ActiveAgent.medication: return Icons.medication;
      case ActiveAgent.report: return Icons.file_open;
      case ActiveAgent.exercise: return Icons.directions_run;
      case ActiveAgent.consultation: return Icons.chat;
      default: return Icons.chat_bubble_outline;
    }
  }

  String _formatTime(DateTime time) {
    final now = DateTime.now();
    final diff = now.difference(time);
    if (diff.inMinutes < 60) return '${diff.inMinutes}分钟前';
    if (diff.inHours < 24) return '${diff.inHours}小时前';
    if (diff.inDays < 7) return '${diff.inDays}天前';
    return '${time.month}/${time.day}';
  }
}