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SpecialX
306
TechHelper.Server/Services/ExamService.cs
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306
TechHelper.Server/Services/ExamService.cs
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using AutoMapper;
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using Entities.Contracts;
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using Entities.DTO;
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using Microsoft.AspNetCore.Identity;
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using Microsoft.EntityFrameworkCore;
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using SharedDATA.Api;
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using TechHelper.Services;
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namespace TechHelper.Server.Services
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{
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public class ExamService : IExamService
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{
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private readonly IUnitOfWork _unitOfWork;
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private readonly IRepository<Assignment> _assignmentRepo;
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private readonly IRepository<AssignmentGroup> _assignmentGroupRepo;
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private readonly IRepository<AssignmentQuestion> _assignmentQuestionRepo;
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private readonly IRepository<Question> _questionRepo;
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public ExamService(IUnitOfWork unitOfWork, IMapper mapper, UserManager<User> userManager)
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{
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_unitOfWork = unitOfWork;
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_mapper = mapper;
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_userManager = userManager;
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_assignmentRepo = _unitOfWork.GetRepository<Assignment>();
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_assignmentGroupRepo = _unitOfWork.GetRepository<AssignmentGroup>();
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_assignmentQuestionRepo = _unitOfWork.GetRepository<AssignmentQuestion>();
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_questionRepo = _unitOfWork.GetRepository<Question>();
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}
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private readonly IMapper _mapper;
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private readonly UserManager<User> _userManager;
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public async Task<ApiResponse> AddAsync(ExamDto model)
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{
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try
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{
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var result = await SaveParsedExam(model);
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if (result.Status)
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{
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return ApiResponse.Success("保存试题成功");
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}
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else
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{
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return ApiResponse.Error($"保存试题数据失败{result.Message}");
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}
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"保存试题数据失败: {ex.Message}");
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}
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}
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public Task<ApiResponse> DeleteAsync(Guid id)
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{
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throw new NotImplementedException();
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}
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public Task<ApiResponse> GetAllAsync(QueryParameter query)
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{
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throw new NotImplementedException();
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}
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public async Task<ApiResponse> GetAsync(Guid id)
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{
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try
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{
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var result = await GetExamByIdAsync(id);
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return result;
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"获取试题数据失败: {ex.Message}");
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}
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}
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public Task<ApiResponse> UpdateAsync(ExamDto model)
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{
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throw new NotImplementedException();
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}
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public async Task<ApiResponse> GetExamByIdAsync(Guid assignmentId)
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{
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try
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{
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var assignment = await _unitOfWork.GetRepository<Assignment>().GetFirstOrDefaultAsync(
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predicate: a => a.Id == assignmentId && !a.IsDeleted);
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if (assignment == null)
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{
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return ApiResponse.Error($"找不到 ID 为 {assignmentId} 的试卷。");
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}
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// 获取所有相关题组和题目，并过滤掉已删除的
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var allGroups = await _unitOfWork.GetRepository<AssignmentGroup>().GetAllAsync(
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predicate: ag => ag.AssignmentId == assignmentId && !ag.IsDeleted,
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include: source => source
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.Include(ag => ag.AssignmentQuestions.Where(aq => !aq.IsDeleted))
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.ThenInclude(aq => aq.Question)
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);
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if (allGroups == null || !allGroups.Any())
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{
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// 试卷存在但没有内容，返回一个空的 ExamDto
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return ApiResponse.Success("试卷没有内容。", new ExamDto
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{
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AssignmentId = assignment.Id,
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AssignmentTitle = assignment.Title,
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Description = assignment.Description,
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SubjectArea = assignment.Submissions.ToString()
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});
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}
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var rootGroups = allGroups
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.Where(ag => ag.ParentGroup == null)
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.OrderBy(ag => ag.Number)
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.ToList();
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// 递归映射到 ExamDto
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var examDto = new ExamDto
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{
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AssignmentId = assignment.Id,
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AssignmentTitle = assignment.Title,
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Description = assignment.Description,
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SubjectArea = assignment.Submissions.ToString(),
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QuestionGroups = MapAssignmentGroupsToDto(rootGroups, allGroups)
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};
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return ApiResponse.Success("试卷信息已成功获取。", examDto);
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"获取试卷时发生错误: {ex.Message}", ex);
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}
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}
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private List<QuestionGroupDto> MapAssignmentGroupsToDto(
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List<AssignmentGroup> currentLevelGroups,
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IEnumerable<AssignmentGroup> allFetchedGroups)
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{
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var dtos = new List<QuestionGroupDto>();
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foreach (var group in currentLevelGroups.OrderBy(g => g.Number))
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{
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var groupDto = new QuestionGroupDto
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{
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Title = group.Title,
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Score = (int)(group.TotalPoints ?? 0),
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QuestionReference = group.Descript,
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SubQuestions = group.AssignmentQuestions
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.OrderBy(aq => aq.QuestionNumber)
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.Select(aq => new SubQuestionDto
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{
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Index = aq.QuestionNumber,
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Stem = aq.Question.QuestionText,
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Score = aq.Score?? 0, // 使用 AssignmentQuestion 上的 Score
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SampleAnswer = aq.Question.CorrectAnswer,
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QuestionType = aq.Question.QuestionType.ToString(),
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DifficultyLevel = aq.Question.DifficultyLevel.ToString(),
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Options = new List<OptionDto>() // 这里需要您根据实际存储方式填充 Option
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}).ToList(),
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// 递归映射子题组
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SubQuestionGroups = MapAssignmentGroupsToDto(
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allFetchedGroups.Where(ag => ag.ParentGroup == group.Id && !ag.IsDeleted).ToList(), // 从所有已获取的组中筛选子组
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allFetchedGroups)
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};
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dtos.Add(groupDto);
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}
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return dtos;
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}
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public async Task<TechHelper.Services.ApiResponse> SaveParsedExam(ExamDto examData)
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{
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// 获取当前登录用户
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var currentUser = await _userManager.GetUserAsync(null);
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if (currentUser == null)
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{
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return ApiResponse.Error("未找到当前登录用户，无法保存试题。");
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}
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var currentUserId = currentUser.Id;
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try
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{
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Guid assignmentId;
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// 创建新的 Assignment 实体
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var newAssignment = new Assignment
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{
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Id = Guid.NewGuid(),
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Title = examData.AssignmentTitle,
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Description = examData.Description,
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SubjectArea = examData.SubjectArea,
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CreatedAt = DateTime.UtcNow,
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CreatedBy = currentUserId,
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IsDeleted = false
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};
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await _assignmentRepo.InsertAsync(newAssignment);
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assignmentId = newAssignment.Id;
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// 从 ExamDto.QuestionGroups 获取根题组。
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// 确保只有一个根题组，因为您的模型是“试卷只有一个根节点”。
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if (examData.QuestionGroups == null || examData.QuestionGroups.Count != 1)
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{
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throw new ArgumentException("试卷必须包含且只能包含一个根题组。");
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}
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// 递归处理根题组及其所有子题组和题目
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// 传入的 assignmentId 仅用于设置根题组的 AssignmentId 字段
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// 对于子题组，ProcessAndSaveAssignmentGroupsRecursive 会将 AssignmentId 设置为 null
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await ProcessAndSaveAssignmentGroupsRecursive(
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examData.QuestionGroups.Single(),
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examData.SubjectArea.ToString(),
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assignmentId,
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null, // 根题组没有父级
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currentUserId);
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if (await _unitOfWork.SaveChangesAsync() > 0)
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{
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return ApiResponse.Success("试卷数据已成功保存。", new ExamDto { AssignmentId = assignmentId, AssignmentTitle = examData.AssignmentTitle });
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}
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else
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{
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return ApiResponse.Success("没有新的试卷数据需要保存。");
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}
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}
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catch (Exception ex)
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{
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return ApiResponse.Error($"保存试卷数据失败: {ex.Message}", ex);
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}
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}
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private async Task ProcessAndSaveAssignmentGroupsRecursive(
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QuestionGroupDto qgDto,
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string subjectarea,
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Guid assignmentId,
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Guid? parentAssignmentGroupId,
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Guid createdById)
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{
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byte groupNumber = 1;
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var newAssignmentGroup = new AssignmentGroup
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{
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Id = Guid.NewGuid(), // 后端生成 GUID
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Title = qgDto.Title,
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Descript = qgDto.QuestionReference,
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TotalPoints = qgDto.Score,
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Number = (byte)qgDto.Index, // 使用 DTO 的 Index 作为 Number
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ParentGroup = parentAssignmentGroupId, // 设置父级题组 GUID
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// 关键修正：只有当 parentAssignmentGroupId 为 null 时，才设置 AssignmentId
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// 这意味着当前题组是顶级题组
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AssignmentId = parentAssignmentGroupId == null ? assignmentId : Guid.Empty,
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IsDeleted = false
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};
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await _unitOfWork.GetRepository<AssignmentGroup>().InsertAsync(newAssignmentGroup);
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// 处理子题目
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uint questionNumber = 1;
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foreach (var sqDto in qgDto.SubQuestions.OrderBy(s => s.Index))
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{
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var newQuestion = _mapper.Map<Question>(sqDto);
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newQuestion.Id = Guid.NewGuid();
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newQuestion.CreatedBy = createdById;
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newQuestion.CreatedAt = DateTime.UtcNow;
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newQuestion.UpdatedAt = DateTime.UtcNow;
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newQuestion.IsDeleted = false;
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newQuestion.SubjectArea = (SubjectAreaEnum)Enum.Parse(typeof(SubjectAreaEnum), subjectarea, true);
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// 处理 Options：如果 Options 是 JSON 字符串或需要其他存储方式，在这里处理
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// 例如：newQuestion.QuestionText += (JsonConvert.SerializeObject(sqDto.Options));
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await _unitOfWork.GetRepository<Question>().InsertAsync(newQuestion);
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var newAssignmentQuestion = new AssignmentQuestion
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{
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Id = Guid.NewGuid(),
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QuestionId = newQuestion.Id,
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QuestionNumber = (byte)questionNumber, // 使用递增的 questionNumber
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AssignmentGroupId = newAssignmentGroup.Id, // 关联到当前题组
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Score = sqDto.Score, // 从 DTO 获取单个子题分数
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IsDeleted = false,
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CreatedAt = DateTime.UtcNow
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};
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await _unitOfWork.GetRepository<AssignmentQuestion>().InsertAsync(newAssignmentQuestion);
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questionNumber++;
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}
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// 递归处理子题组
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// 这里需要遍历 SubQuestionGroups，并对每个子组进行递归调用
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foreach (var subQgDto in qgDto.SubQuestionGroups.OrderBy(s => s.Index))
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{
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await ProcessAndSaveAssignmentGroupsRecursive(
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subQgDto, // 传入当前的子题组 DTO
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subjectarea,
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assignmentId, // 顶层 AssignmentId 依然传递下去，但子组不会直接使用它
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newAssignmentGroup.Id, // 将当前题组的 ID 作为下一层递归的 parentAssignmentGroupId
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createdById);
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}
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}
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}
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}
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