// 💬 커뮤니티 게시판 - 게시글 상세(+댓글) 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 BoardPostController extends ChangeNotifier {
  final int postId;
  final String studentId;

  BoardPostController({required this.postId, required this.studentId});

  bool _isLoading = true;
  bool _isBusy = false;
  bool _postDeleted = false;
  Map<String, dynamic>? _post;
  List<dynamic> _comments = [];
  bool _disposed = false;

  bool get isLoading => _isLoading;
  bool get isBusy => _isBusy;
  bool get postDeleted => _postDeleted;
  Map<String, dynamic>? get post => _post;
  List<dynamic> get comments => _comments;

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

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

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

  Future<void> fetchDetail() async {
    _isLoading = true;
    _safeNotify();
    try {
      final response = await http.get(
        Uri.parse('$baseUrl/api/board/posts/$postId?studentId=$studentId'),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        _post = Map<String, dynamic>.from(result['post']);
        _comments = result['comments'] ?? [];
      } else {
        _postDeleted = true;
      }
    } catch (_) {
      // 조용히 무시 - 마지막으로 받아온 상태를 유지한다.
    } finally {
      _isLoading = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> addComment(String content) async {
    if (content.trim().isEmpty) return (false, '댓글 내용을 입력해주세요.');
    _isBusy = true;
    _safeNotify();
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/board/posts/$postId/comments'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({"studentId": studentId, "content": content.trim()}),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        await fetchDetail();
        return (true, '댓글이 등록되었습니다.');
      }
      return (false, '${result['message'] ?? '댓글 등록 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    } finally {
      _isBusy = false;
      _safeNotify();
    }
  }

  Future<(bool success, String message)> deletePost() async {
    return _delete('$baseUrl/api/board/posts/$postId');
  }

  Future<(bool success, String message)> deleteComment(int commentId) async {
    final (success, message) = await _delete(
      '$baseUrl/api/board/comments/$commentId',
    );
    if (success) await fetchDetail();
    return (success, message);
  }

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

  Future<(bool success, String message)> report({
    required String targetType,
    required int targetId,
    String? reason,
  }) async {
    try {
      final response = await http.post(
        Uri.parse('$baseUrl/api/board/reports'),
        headers: {"Content-Type": "application/json"},
        body: jsonEncode({
          "targetType": targetType,
          "targetId": targetId,
          "reporterStudentId": studentId,
          "reason": reason,
        }),
      );
      final result = jsonDecode(utf8.decode(response.bodyBytes));
      if (response.statusCode == 200 && result['status'] == 'success') {
        return (true, '${result['message'] ?? '신고가 접수되었습니다.'}');
      }
      return (false, '${result['message'] ?? '신고 접수 실패'}');
    } catch (e) {
      return (false, '네트워크 에러: $e');
    }
  }
}