// 📍 선생님 호출(학생용) 화면의 기능(서버 통신/상태) 담당 컨트롤러.
import 'dart:convert';
import 'package:flutter/foundation.dart';
import 'package:http/http.dart' as http;
import '../config.dart';
import '../data/teacher_call_schedule.dart';

class TeacherCallController extends ChangeNotifier {
  final String studentId;
  final String studentName;

  TeacherCallController({required this.studentId, required this.studentName});

  bool _isLoading = true;
  bool _isCalling = false;
  List<dynamic> _teachers = [];
  List<dynamic> _myCalls = [];
  List<dynamic> _ranking = [];
  bool _disposed = false;

  bool get isLoading => _isLoading;
  bool get isCalling => _isCalling;
  List<dynamic> get teachers => _teachers;
  List<dynamic> get myCalls => _myCalls;
  List<dynamic> get ranking => _ranking;

  void _safeNotify() {
    if (!_disposed) notifyListeners();
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }

  bool isInClassNow(String teacherName) {
    final now = DateTime.now();
    final hhmm =
        '${now.hour.toString().padLeft(2, '0')}:${now.minute.toString().padLeft(2, '0')}';
    return teachersInClassNow(now.weekday, hhmm).contains(teacherName);
  }

  Future<void> init() async {
    await Future.wait([_fetchTeachers(), _fetchMyCalls(), _fetchRanking()]);
    _isLoading = false;
    _safeNotify();
  }

  Future<void> refresh() => init();

  Future<void> _fetchTeachers() async {
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/teacher-call/teachers'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _teachers = data['teachers'] ?? [];
      }
    } catch (_) {
      // 조용히 무시 - 마지막으로 받아온 목록을 유지한다.
    }
  }

  Future<void> _fetchMyCalls() async {
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/teacher-call/my-calls?studentId=$studentId'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _myCalls = data['calls'] ?? [];
      }
    } catch (_) {
      // 조용히 무시
    }
  }

  Future<void> _fetchRanking() async {
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/teacher-call/ranking'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _ranking = data['ranking'] ?? [];
      }
    } catch (_) {
      // 조용히 무시
    }
  }

  Future<(bool success, String message)> callTeacher({
    required String teacherId,
    required String purpose,
  }) async {
    _isCalling = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/teacher-call/call'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "studentId": studentId,
          "studentName": studentName,
          "teacherId": teacherId,
          "purpose": purpose,
        }),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        await Future.wait([_fetchMyCalls(), _fetchRanking()]);
        return (true, '${result['message'] ?? '호출했습니다.'}');
      }
      return (false, '${result['message'] ?? '호출 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isCalling = false;
      _safeNotify();
    }
  }
}