import 'package:flutter/foundation.dart';
import 'package:injectable/injectable.dart';
import 'package:superport/core/constants/api_endpoints.dart';
import 'package:superport/core/errors/exceptions.dart';
import 'package:superport/data/datasources/remote/api_client.dart';
import 'package:superport/data/models/license/license_dto.dart';
import 'package:superport/data/models/license/license_request_dto.dart';
import 'package:superport/data/models/license/license_query_dto.dart';

abstract class LicenseRemoteDataSource {
  Future<LicenseListResponseDto> getLicenses({
    int page = 1,
    int perPage = 20,
    bool? isActive,
    int? companyId,
    int? assignedUserId,
    String? licenseType,
  });

  Future<LicenseDto> getLicenseById(int id);
  Future<LicenseDto> createLicense(CreateLicenseRequest request);
  Future<LicenseDto> updateLicense(int id, UpdateLicenseRequest request);
  Future<void> deleteLicense(int id);
  Future<LicenseDto> assignLicense(int id, AssignLicenseRequest request);
  Future<LicenseDto> unassignLicense(int id);
  Future<ExpiringLicenseListDto> getExpiringLicenses({
    int days = 30,
    int page = 1,
    int perPage = 20,
  });
}

@LazySingleton(as: LicenseRemoteDataSource)
class LicenseRemoteDataSourceImpl implements LicenseRemoteDataSource {
  final ApiClient _apiClient;

  LicenseRemoteDataSourceImpl({
    required ApiClient apiClient,
  }) : _apiClient = apiClient;

  @override
  Future<LicenseListResponseDto> getLicenses({
    int page = 1,
    int perPage = 20,
    bool? isActive,
    int? companyId,
    int? assignedUserId,
    String? licenseType,
  }) async {
    try {
      final queryParams = <String, dynamic>{
        'page': page,
        'per_page': perPage,
      };

      if (isActive != null) queryParams['is_active'] = isActive;
      if (companyId != null) queryParams['company_id'] = companyId;
      if (assignedUserId != null) queryParams['assigned_user_id'] = assignedUserId;
      if (licenseType != null) queryParams['license_type'] = licenseType;

      final response = await _apiClient.get(
        ApiEndpoints.licenses,
        queryParameters: queryParams,
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        // API 응답이 배열인 경우와 객체인 경우를 모두 처리
        final data = response.data['data'];
        if (data is List) {
          // 배열 응답을 LicenseListResponseDto 형식으로 변환
          final List<LicenseDto> licenses = [];
          
          for (int i = 0; i < data.length; i++) {
            try {
              final item = data[i];
              debugPrint('📑 Parsing license item $i: ${item['license_key']}');
              
              // null 검사 및 기본값 설정
              final licenseDto = LicenseDto.fromJson({
                ...item,
                // 필수 필드 보장
                'license_key': item['license_key'] ?? '',
                'is_active': item['is_active'] ?? true,
                'created_at': item['created_at'] ?? DateTime.now().toIso8601String(),
                'updated_at': item['updated_at'] ?? DateTime.now().toIso8601String(),
              });
              licenses.add(licenseDto);
            } catch (e, stackTrace) {
              debugPrint('❌ Error parsing license item $i: $e');
              debugPrint('Item data: ${data[i]}');
              debugPrint('Stack trace: $stackTrace');
              // 파싱 실패한 항목은 건너뛰고 계속
              continue;
            }
          }
          
          final pagination = response.data['pagination'] ?? {};
          return LicenseListResponseDto(
            items: licenses,
            total: pagination['total'] ?? licenses.length,
            page: pagination['page'] ?? page,
            perPage: pagination['per_page'] ?? perPage,
            totalPages: pagination['total_pages'] ?? 1,
          );
        } else if (data['items'] != null) {
          // 이미 LicenseListResponseDto 형식인 경우
          return LicenseListResponseDto.fromJson(data);
        } else {
          // 예상치 못한 형식인 경우
          throw ApiException(
            message: 'Unexpected response format for license list',
          );
        }
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch licenses',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<LicenseDto> getLicenseById(int id) async {
    try {
      final response = await _apiClient.get(
        '${ApiEndpoints.licenses}/$id',
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        return LicenseDto.fromJson(response.data['data']);
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch license',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<LicenseDto> createLicense(CreateLicenseRequest request) async {
    try {
      final response = await _apiClient.post(
        ApiEndpoints.licenses,
        data: request.toJson(),
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        return LicenseDto.fromJson(response.data['data']);
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch license',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<LicenseDto> updateLicense(int id, UpdateLicenseRequest request) async {
    try {
      final response = await _apiClient.put(
        '${ApiEndpoints.licenses}/$id',
        data: request.toJson(),
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        return LicenseDto.fromJson(response.data['data']);
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch license',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<void> deleteLicense(int id) async {
    try {
      await _apiClient.delete(
        '${ApiEndpoints.licenses}/$id',
      );
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<LicenseDto> assignLicense(int id, AssignLicenseRequest request) async {
    try {
      final response = await _apiClient.patch(
        '${ApiEndpoints.licenses}/$id/assign',
        data: request.toJson(),
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        return LicenseDto.fromJson(response.data['data']);
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch license',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<LicenseDto> unassignLicense(int id) async {
    try {
      final response = await _apiClient.patch(
        '${ApiEndpoints.licenses}/$id/unassign',
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        return LicenseDto.fromJson(response.data['data']);
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch license',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  @override
  Future<ExpiringLicenseListDto> getExpiringLicenses({
    int days = 30,
    int page = 1,
    int perPage = 20,
  }) async {
    try {
      final queryParams = <String, dynamic>{
        'days': days,
        'page': page,
        'per_page': perPage,
      };

      final response = await _apiClient.get(
        '${ApiEndpoints.licenses}/expiring',
        queryParameters: queryParams,
      );

      if (response.data != null && response.data['success'] == true && response.data['data'] != null) {
        // API 응답이 배열 형태인 경우 처리
        final data = response.data['data'];
        final pagination = response.data['pagination'] ?? {};
        
        if (data is List) {
          // 배열 응답을 ExpiringLicenseListDto 형식으로 변환
          final List<ExpiringLicenseDto> licenses = [];
          
          for (var item in data) {
            try {
              licenses.add(ExpiringLicenseDto.fromJson(item));
            } catch (e) {
              debugPrint('❌ Error parsing expiring license: $e');
              debugPrint('Item data: $item');
              continue;
            }
          }
          
          return ExpiringLicenseListDto(
            items: licenses,
            total: pagination['total'] ?? licenses.length,
            page: pagination['page'] ?? page,
            perPage: pagination['per_page'] ?? perPage,
            totalPages: pagination['total_pages'] ?? 1,
          );
        } else {
          // 이미 올바른 형식인 경우
          return ExpiringLicenseListDto.fromJson(data);
        }
      } else {
        throw ApiException(
          message: response.data?['error']?['message'] ?? 'Failed to fetch expiring licenses',
        );
      }
    } catch (e) {
      throw _handleError(e);
    }
  }

  Exception _handleError(dynamic error) {
    if (error is ApiException) {
      return error;
    }
    return ApiException(
      message: error.toString(),
    );
  }
}