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

import '../theme.dart';
import '../widgets/avatar.dart';

/// 「新的同事」：收到的好友申请列表，可接受 / 拒绝
class NewFriendsScreen extends StatefulWidget {
  const NewFriendsScreen({super.key});

  @override
  State<NewFriendsScreen> createState() => _NewFriendsScreenState();
}

class _NewFriendsScreenState extends State<NewFriendsScreen> {
  List<FriendApplicationInfo> _list = [];
  bool _loading = true;
  bool _failed = false;

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

  Future<void> _load() async {
    try {
      final list = await OpenIM.iMManager.friendshipManager.getFriendApplicationListAsRecipient();
      if (!mounted) return;
      setState(() {
        _list = list;
        _loading = false;
        _failed = false;
      });
    } catch (_) {
      if (!mounted) return;
      setState(() {
        _loading = false;
        _failed = true;
      });
    }
  }

  Future<void> _handle(FriendApplicationInfo a, bool accept) async {
    try {
      if (accept) {
        await OpenIM.iMManager.friendshipManager.acceptFriendApplication(userID: a.fromUserID ?? '', handleMsg: '');
      } else {
        await OpenIM.iMManager.friendshipManager.refuseFriendApplication(userID: a.fromUserID ?? '', handleMsg: '');
      }
      if (!mounted) return;
      setState(() => a.handleResult = accept ? 1 : -1);
      _toast(accept ? '已添加为同事' : '已拒绝');
    } catch (_) {
      _toast('操作失败，请检查网络后重试');
    }
  }

  void _toast(String text) {
    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(text), duration: const Duration(seconds: 2)));
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('新的同事')),
      body: _buildBody(),
    );
  }

  Widget _buildBody() {
    if (_loading) {
      return const Center(child: CircularProgressIndicator(color: AppColors.primary));
    }
    if (_failed) {
      return Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            const Text('申请列表没加载出来', style: TextStyle(fontSize: AppFont.body, color: AppColors.textPrimary)),
            const SizedBox(height: AppGap.x4),
            OutlinedButton(onPressed: _load, child: const Text('重试')),
          ],
        ),
      );
    }
    if (_list.isEmpty) {
      return const Center(
        child: Text('暂时没有新的申请', style: TextStyle(fontSize: AppFont.sub, color: AppColors.textSecondary)),
      );
    }
    return ListView.separated(
      itemCount: _list.length,
      separatorBuilder: (_, __) => const Divider(indent: 76),
      itemBuilder: (_, i) => _tile(_list[i]),
    );
  }

  Widget _tile(FriendApplicationInfo a) {
    final name = a.fromNickname?.isNotEmpty == true ? a.fromNickname! : (a.fromUserID ?? '');
    Widget trailing;
    if (a.handleResult == 1) {
      trailing = const Text('已添加', style: TextStyle(fontSize: AppFont.sub, color: AppColors.textSecondary));
    } else if (a.handleResult == -1) {
      trailing = const Text('已拒绝', style: TextStyle(fontSize: AppFont.sub, color: AppColors.textSecondary));
    } else {
      trailing = Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          FilledButton(
            onPressed: () => _handle(a, true),
            style: FilledButton.styleFrom(
              backgroundColor: AppColors.primary,
              minimumSize: const Size(0, 32),
              padding: const EdgeInsets.symmetric(horizontal: AppGap.x3),
            ),
            child: const Text('接受', style: TextStyle(fontSize: AppFont.sub)),
          ),
          const SizedBox(width: AppGap.x2),
          OutlinedButton(
            onPressed: () => _handle(a, false),
            style: OutlinedButton.styleFrom(
              minimumSize: const Size(0, 32),
              padding: const EdgeInsets.symmetric(horizontal: AppGap.x3),
            ),
            child: const Text('拒绝', style: TextStyle(fontSize: AppFont.sub)),
          ),
        ],
      );
    }
    return ListTile(
      leading: NameAvatar(name: name),
      title: Text(name, style: const TextStyle(fontSize: AppFont.body)),
      subtitle: a.reqMsg?.isNotEmpty == true
          ? Text(a.reqMsg!, maxLines: 1, overflow: TextOverflow.ellipsis, style: const TextStyle(fontSize: AppFont.sub, color: AppColors.textSecondary))
          : null,
      trailing: trailing,
    );
  }
}