import 'package:agora_rtc_engine/agora_rtc_engine.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../viewmodel/stu_room_vm.dart';

class TeacherVideo extends StatefulWidget {
  const TeacherVideo({super.key});

  @override
  State<TeacherVideo> createState() => _TeacherVideoState();
}

class _TeacherVideoState extends State<TeacherVideo> {
  @override
  Widget build(BuildContext context) {
    final vm = context.read<StuRoomVM>();
    final teacherInfo = vm.teacherInfo;

    ///没开始
    if (vm.roomStatus == 0) {
      return _empty("自习室还没开始");
    }

    ///开始
    if (vm.roomStatus == 1 && vm.engine != null) {
      if (teacherInfo == null) {
        return _empty("老师不在自习室内");
      }
      if (teacherInfo.online == 0) {
        return _empty("老师掉线了，请耐心等待");
      }
      return AgoraVideoView(
        controller: VideoViewController(
          rtcEngine: vm.engine!,
          canvas: VideoCanvas(
            uid: vm.teacherInfo!.userId,
          ),
        ),
      );
    }

    ///结束
    if (vm.roomStatus == 2) {
      return _empty("自习室已结束");
    }
    return _empty("加载中");
  }

  Widget _empty(String title) {
    return SafeArea(
      child: Align(
        child: Text(
          title,
          style: TextStyle(color: Colors.white),
        ),
      ),
    );
  }
}