school-attendance/lib/function/study_preset_controller.dart

// 🍅 뽀모도로 루틴 공유(다른 학생과 공부/휴식 시간 조합 공유) 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';

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

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

  bool _isLoading = true;
  bool _isBusy = false;
  String _sort = 'popular'; // popular / recent
  List<dynamic> _presets = [];
  bool _disposed = false;

  bool get isLoading => _isLoading;
  bool get isBusy => _isBusy;
  String get sort => _sort;
  List<dynamic> get presets => _presets;

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

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

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

  Future<void> setSort(String sort) async {
    if (_sort == sort) return;
    _sort = sort;
    await fetchPresets();
  }

  Future<void> fetchPresets() async {
    _isLoading = true;
    _safeNotify();
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/study/presets?sort=$_sort'),
      );
      if (response.statusCode == 200) {
        final data = jsonDecode(utf8.decode(response.bodyBytes));
        _presets = data['presets'] ?? [];
      }
    } catch (_) {
      // 조용히 무시 - 마지막으로 받아온 목록을 유지한다.
    } finally {
      _isLoading = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> share({
    required String title,
    required int studyMinutes,
    required int breakMinutes,
  }) async {
    _isBusy = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/study/presets'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "studentId": studentId,
          "studentName": studentName,
          "title": title.trim(),
          "studyMinutes": studyMinutes,
          "breakMinutes": breakMinutes,
        }),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        await fetchPresets();
        return (true, '${result['message'] ?? '루틴을 공유했습니다.'}');
      }
      return (false, '${result['message'] ?? '루틴 공유 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isBusy = false;
      _safeNotify();
    }
  }

  /// 다른 학생의 루틴을 내 설정으로 적용할 때 호출 - 인기도(사용 횟수)만 올려준다.
  Future<void> markUsed(int presetId) async {
    try {
      await http.post(Uri.parse('$baseUrl/api/study/presets/$presetId/use'));
    } catch (_) {
      // 인기도 집계 실패는 조용히 무시 - 적용 자체는 이미 끝난 뒤라 영향 없다.
    }
  }

  Future<(bool success, String message)> delete(int presetId) async {
    _isBusy = true;
    _safeNotify();
    try {
      final response = await http.delete(
        Uri.parse('$baseUrl/api/study/presets/$presetId'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"studentId": studentId}),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        await fetchPresets();
        return (true, '${result['message'] ?? '삭제되었습니다.'}');
      }
      return (false, '${result['message'] ?? '삭제 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isBusy = false;
      _safeNotify();
    }
  }
}