import 'dart:convert';
import 'dart:developer'; // 👈 [추가] log 함수를 위한 임포트
import 'package:http/http.dart' as http;
import 'package:sudoku_app/models/sudoku_game_dto.dart';
import 'package:sudoku_app/models/unified_rank_dto.dart';
import 'package:sudoku_app/models/game_rank_dto.dart';

class PuzzleService {
  final String _baseUrl = "https://lunaticbum.kr"; 

  // ... (startGame 함수는 동일) ...
  Future<SudokuGameDto> startGame(String difficulty) async {
    final response = await http.get(
      Uri.parse('$_baseUrl/puzzle/sudoku/start?difficulty=$difficulty'),
    );
    if (response.statusCode == 200) {
      final data = jsonDecode(utf8.decode(response.bodyBytes));
      return SudokuGameDto.fromJson(data);
    } else {
      throw Exception('게임 로딩 실패: ${response.statusCode}');
    }
  }

  // ... (validateSolution 함수는 동일) ...
  Future<bool> validateSolution(int puzzleId, String answer) async {
    final response = await http.post(
      Uri.parse('$_baseUrl/puzzle/sudoku/validate'),
      headers: {'Content-Type': 'application/json'},
      body: jsonEncode({
        'puzzleId': puzzleId,
        'answer': answer,
      }),
    );
    if (response.statusCode == 200) {
      return jsonDecode(response.body)['correct'] ?? false;
    } else {
      log("정답 확인 실패: ${response.statusCode}");
      log("응답 본문: ${response.body}"); 
      throw Exception('정답 확인 실패: ${response.statusCode}');
    }
  }

  // POST /api/ranks/submit
  Future<void> submitRank(UnifiedRankDto rankDto) async {
    
    final requestBody = jsonEncode(rankDto.toJson());
    
    // 🔽 [로그 추가] 1. 서버로 전송하는 JSON 데이터 출력
    log(">>> 랭킹 등록 요청: $requestBody");

    final response = await http.post(
      Uri.parse('$_baseUrl/api/ranks/submit'),
      headers: {'Content-Type': 'application/json'},
      body: requestBody,
    );

    if (response.statusCode != 200) {
      // 🔽 [로그 추가] 2. 서버가 200(OK)이 아닌 응답을 줬을 때
      log("<<< 랭킹 등록 실패: ${response.statusCode}");
      try {
        final errorBody = utf8.decode(response.bodyBytes);
        log("<<< 서버 에러 메시지: $errorBody"); // 👈 (예: "이미 사용 중인 이름입니다.")
        throw Exception(errorBody);
      } catch (e) {
         throw Exception('랭킹 등록 실패: ${response.reasonPhrase}');
      }
    }
    
    // 🔽 [로그 추가] 3. 성공 시
    log("<<< 랭킹 등록 성공: 200 OK");
  }

  // ... (fetchRanks 함수는 동일) ...
  Future<List<GameRankDto>> fetchRanks(String gameType, String? contextId) async {
    final queryParams = {
      'gameType': gameType,
      if (contextId != null) 'contextId': contextId,
    };
    final uri = Uri.parse('$_baseUrl/api/ranks/list').replace(queryParameters: queryParams);
    
    final response = await http.get(uri);

    if (response.statusCode == 200) {
      final List<dynamic> data = jsonDecode(utf8.decode(response.bodyBytes));
      return data.map((json) => GameRankDto.fromJson(json)).toList();
    } else {
      throw Exception('랭킹 로딩 실패');
    }
  }
}