import 'package:flutter/material.dart';
import 'package:flutter_openim_sdk/flutter_openim_sdk.dart';

import '../services/im_service.dart';
import '../services/push_service.dart';
import '../theme.dart';
import '../widgets/avatar.dart';
import 'login_screen.dart';

/// 「我的」页：大头像 + 姓名 + 工号，设置 / 关于 / 退出登录
class MineScreen extends StatefulWidget {
  const MineScreen({super.key});

  @override
  State<MineScreen> createState() => _MineScreenState();
}

class _MineScreenState extends State<MineScreen> {
  @override
  void initState() {
    super.initState();
    IMService.instance.refreshSelfInfo();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('我的')),
      body: AnimatedBuilder(
        animation: IMService.instance,
        builder: (context, _) {
          final user = IMService.instance.selfInfo;
          final nickname = user?.nickname?.isNotEmpty == true ? user!.nickname! : '';
          final userID = IMService.instance.currentUserID ?? '';
          return ListView(
            children: [
              // 头部：大头像 + 姓名 + 工号
              Container(
                color: AppColors.pageBg,
                padding: const EdgeInsets.all(AppGap.x4),
                child: Row(
                  children: [
                    NameAvatar(name: nickname.isNotEmpty ? nickname : userID, faceURL: user?.faceURL, size: 64),
                    const SizedBox(width: AppGap.x4),
                    Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text(
                          nickname.isNotEmpty ? nickname : userID,
                          style: const TextStyle(fontSize: AppFont.title, fontWeight: FontWeight.w600, color: AppColors.textPrimary),
                        ),
                        const SizedBox(height: AppGap.x1),
                        Text(
                          '工号：$userID',
                          style: const TextStyle(fontSize: AppFont.sub, color: AppColors.textSecondary),
                        ),
                      ],
                    ),
                  ],
                ),
              ),
              const SizedBox(height: AppGap.x3),
              _item(Icons.settings_outlined, '设置', () => _showSettings(nickname)),
              const Divider(indent: AppGap.x4),
              _item(Icons.info_outline, '关于', _showAbout),
              const Divider(indent: AppGap.x4),
              ListTile(
                leading: const Icon(Icons.logout, color: AppColors.danger),
                title: const Text('退出登录', style: TextStyle(fontSize: AppFont.body, color: AppColors.danger)),
                onTap: _confirmLogout,
              ),
            ],
          );
        },
      ),
    );
  }

  Widget _item(IconData icon, String label, VoidCallback onTap) {
    return ListTile(
      leading: Icon(icon, color: AppColors.textPrimary),
      title: Text(label, style: const TextStyle(fontSize: AppFont.body)),
      trailing: const Icon(Icons.chevron_right, color: AppColors.textSecondary),
      onTap: onTap,
    );
  }

  /// 设置：目前只有修改昵称
  void _showSettings(String currentNickname) {
    final ctrl = TextEditingController(text: currentNickname);
    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      builder: (ctx) => Padding(
        padding: EdgeInsets.only(
          left: AppGap.x4,
          right: AppGap.x4,
          top: AppGap.x4,
          bottom: MediaQuery.of(ctx).viewInsets.bottom + AppGap.x4,
        ),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            const Text('修改昵称', style: TextStyle(fontSize: AppFont.title, fontWeight: FontWeight.w600)),
            const SizedBox(height: AppGap.x4),
            TextField(
              controller: ctrl,
              decoration: InputDecoration(
                hintText: '请输入新昵称',
                filled: true,
                fillColor: AppColors.searchBg,
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(8),
                  borderSide: BorderSide.none,
                ),
              ),
            ),
            const SizedBox(height: AppGap.x4),
            FilledButton(
              onPressed: () async {
                final name = ctrl.text.trim();
                if (name.isEmpty) return;
                try {
                  await OpenIM.iMManager.userManager.setSelfInfo(nickname: name);
                  await IMService.instance.refreshSelfInfo();
                  if (ctx.mounted) Navigator.of(ctx).pop();
                } catch (_) {
                  if (ctx.mounted) {
                    ScaffoldMessenger.of(ctx).showSnackBar(
                      const SnackBar(content: Text('修改失败，请检查网络后重试'), duration: Duration(seconds: 2)),
                    );
                  }
                }
              },
              style: FilledButton.styleFrom(backgroundColor: AppColors.primary),
              child: const Text('保存', style: TextStyle(fontSize: AppFont.body)),
            ),
          ],
        ),
      ),
    );
  }

  void _showAbout() {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('关于畅联'),
        content: const Text('畅联 1.0.0\n公司内部通讯工具，供同事之间消息、文件与语音通话使用。'),
        actions: [
          TextButton(onPressed: () => Navigator.of(ctx).pop(), child: const Text('知道了')),
        ],
      ),
    );
  }

  void _confirmLogout() {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('退出登录'),
        content: const Text('退出后要重新输入工号和密码，确定退出吗？'),
        actions: [
          TextButton(onPressed: () => Navigator.of(ctx).pop(), child: const Text('取消')),
          TextButton(
            onPressed: () async {
              Navigator.of(ctx).pop();
              await LoginScreen.clearCredential();
              await PushService.instance.unbindUser();
              await IMService.instance.logout();
              if (!mounted) return;
              Navigator.of(context).pushAndRemoveUntil(
                MaterialPageRoute(builder: (_) => const LoginScreen()),
                (route) => false,
              );
            },
            child: const Text('退出', style: TextStyle(color: AppColors.danger)),
          ),
        ],
      ),
    );
  }
}