import 'package:get_it/get_it.dart';
import 'package:injectable/injectable.dart';
import 'package:superport/core/errors/exceptions.dart';
import 'package:superport/core/errors/failures.dart';
import 'package:superport/data/datasources/remote/license_remote_datasource.dart';
import 'package:superport/data/models/license/license_dto.dart';
import 'package:superport/data/models/license/license_request_dto.dart';
import 'package:superport/models/license_model.dart';

@lazySingleton
class LicenseService {
  final LicenseRemoteDataSource _remoteDataSource;
  
  LicenseService(this._remoteDataSource);

  // 라이선스 목록 조회
  Future<List<License>> getLicenses({
    int page = 1,
    int perPage = 20,
    bool? isActive,
    int? companyId,
    int? assignedUserId,
    String? licenseType,
  }) async {
    try {
      final response = await _remoteDataSource.getLicenses(
        page: page,
        perPage: perPage,
        isActive: isActive,
        companyId: companyId,
        assignedUserId: assignedUserId,
        licenseType: licenseType,
      );

      return response.items.map((dto) => _convertDtoToLicense(dto)).toList();
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 목록을 불러오는 데 실패했습니다: $e');
    }
  }

  // 라이선스 상세 조회
  Future<License> getLicenseById(int id) async {
    try {
      final dto = await _remoteDataSource.getLicenseById(id);
      return _convertDtoToLicense(dto);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 정보를 불러오는 데 실패했습니다: $e');
    }
  }

  // 라이선스 생성
  Future<License> createLicense(License license) async {
    try {
      final request = CreateLicenseRequest(
        licenseKey: license.licenseKey,
        productName: license.productName,
        vendor: license.vendor,
        licenseType: license.licenseType,
        userCount: license.userCount,
        purchaseDate: license.purchaseDate,
        expiryDate: license.expiryDate,
        purchasePrice: license.purchasePrice,
        companyId: license.companyId,
        branchId: license.branchId,
        remark: license.remark,
      );

      final dto = await _remoteDataSource.createLicense(request);
      return _convertDtoToLicense(dto);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 생성에 실패했습니다: $e');
    }
  }

  // 라이선스 수정
  Future<License> updateLicense(License license) async {
    try {
      if (license.id == null) {
        throw BusinessFailure(message: '라이선스 ID가 없습니다');
      }

      final request = UpdateLicenseRequest(
        licenseKey: license.licenseKey,
        productName: license.productName,
        vendor: license.vendor,
        licenseType: license.licenseType,
        userCount: license.userCount,
        purchaseDate: license.purchaseDate,
        expiryDate: license.expiryDate,
        purchasePrice: license.purchasePrice,
        remark: license.remark,
        isActive: license.isActive,
      );

      final dto = await _remoteDataSource.updateLicense(license.id!, request);
      return _convertDtoToLicense(dto);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 수정에 실패했습니다: $e');
    }
  }

  // 라이선스 삭제
  Future<void> deleteLicense(int id) async {
    try {
      await _remoteDataSource.deleteLicense(id);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 삭제에 실패했습니다: $e');
    }
  }

  // 라이선스 할당
  Future<License> assignLicense(int licenseId, int userId) async {
    try {
      final request = AssignLicenseRequest(userId: userId);
      final dto = await _remoteDataSource.assignLicense(licenseId, request);
      return _convertDtoToLicense(dto);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 할당에 실패했습니다: $e');
    }
  }

  // 라이선스 할당 해제
  Future<License> unassignLicense(int licenseId) async {
    try {
      final dto = await _remoteDataSource.unassignLicense(licenseId);
      return _convertDtoToLicense(dto);
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '라이선스 할당 해제에 실패했습니다: $e');
    }
  }

  // 만료 예정 라이선스 조회
  Future<List<License>> getExpiringLicenses({
    int days = 30,
    int page = 1,
    int perPage = 20,
  }) async {
    try {
      final response = await _remoteDataSource.getExpiringLicenses(
        days: days,
        page: page,
        perPage: perPage,
      );

      return response.items.map((dto) => _convertExpiringDtoToLicense(dto)).toList();
    } on ApiException catch (e) {
      throw ServerFailure(message: e.message);
    } catch (e) {
      throw ServerFailure(message: '만료 예정 라이선스를 불러오는 데 실패했습니다: $e');
    }
  }

  // DTO를 Flutter 모델로 변환
  License _convertDtoToLicense(LicenseDto dto) {
    return License(
      id: dto.id,
      licenseKey: dto.licenseKey,
      productName: dto.productName,
      vendor: dto.vendor,
      licenseType: dto.licenseType,
      userCount: dto.userCount,
      purchaseDate: dto.purchaseDate,
      expiryDate: dto.expiryDate,
      purchasePrice: dto.purchasePrice,
      companyId: dto.companyId,
      branchId: dto.branchId,
      assignedUserId: dto.assignedUserId,
      remark: dto.remark,
      isActive: dto.isActive,
      createdAt: dto.createdAt,
      updatedAt: dto.updatedAt,
      companyName: dto.companyName,
      branchName: dto.branchName,
      assignedUserName: dto.assignedUserName,
    );
  }

  // 만료 예정 DTO를 Flutter 모델로 변환
  License _convertExpiringDtoToLicense(ExpiringLicenseDto dto) {
    return License(
      id: dto.id,
      licenseKey: dto.licenseKey,
      productName: dto.productName,
      vendor: null,
      licenseType: null,
      userCount: null,
      purchaseDate: null,
      expiryDate: dto.expiryDate,
      purchasePrice: null,
      companyId: null,
      branchId: null,
      assignedUserId: null,
      remark: null,
      isActive: dto.isActive,
      createdAt: null,
      updatedAt: null,
      companyName: dto.companyName,
      branchName: null,
      assignedUserName: null,
    );
  }

  // 페이지네이션 정보
  Future<int> getTotalLicenses({
    bool? isActive,
    int? companyId,
    int? assignedUserId,
    String? licenseType,
  }) async {
    try {
      final response = await _remoteDataSource.getLicenses(
        page: 1,
        perPage: 1,
        isActive: isActive,
        companyId: companyId,
        assignedUserId: assignedUserId,
        licenseType: licenseType,
      );
      return response.total;
    } catch (e) {
      return 0;
    }
  }
}