feat: 添加学生提交系统功能

- 添加学生提交管理服务 (StudentSubmissionService, StudentSubmissionDetailService)
- 新增学生提交相关控制器 (StudentSubmissionController, StudentSubmissionDetailController)
- 添加学生提交数据传输对象 (StudentSubmissionDetailDto, StudentSubmissionSummaryDto)
- 新增学生提交相关页面组件 (StudentExamView, ExamDetailView, StudentCard等)
- 添加学生提交信息卡片组件 (SubmissionInfoCard, TeacherSubmissionInfoCard)
- 更新数据库迁移文件以支持提交系统

TechHelper.Server/Services/StudentSubmissionDetailService.cs

@@ -0,0 +1,144 @@
+using AutoMapper;
+using AutoMapper.Internal.Mappers;
+using Entities.Contracts;
+using Entities.DTO;
+using Microsoft.EntityFrameworkCore;
+using SharedDATA.Api;
+using TechHelper.Context;
+using TechHelper.Repository;
+using TechHelper.Services;
+
+namespace TechHelper.Server.Services
+{
+	public class StudentSubmissionDetailService : IStudentSubmissionDetailService
+	{
+		private readonly IUnitOfWork _unitOfWork;
+		private readonly IExamService examService;
+		private readonly IMapper _mapper;
+
+		public StudentSubmissionDetailService(
+			IUnitOfWork unitOfWork,
+			IExamService examService,
+			IMapper mapper)
+		{
+			_unitOfWork = unitOfWork;
+			this.examService = examService;
+			_mapper = mapper;
+		}
+
+		public async Task<ApiResponse> GetSubmissionDetailAsync(Guid submissionId)
+		{
+			try
+			{
+				// 获取submission基本信息
+				var submission = await _unitOfWork.GetRepository<Submission>()
+					.GetAll(s => s.Id == submissionId)
+					.Include(s => s.Assignment)
+					.ThenInclude(a => a.Creator)
+					.FirstOrDefaultAsync();
+
+				if (submission == null)
+				{
+					return ApiResponse.Error("未找到指定的提交记录");
+				}
+
+				var assignment = await examService.GetAsync(submission.AssignmentId);
+				if (assignment == null)
+				{
+					return ApiResponse.Error("未找到指定的作业");
+				}
+
+				// 获取所有提交详情
+				var submissionDetails = await _unitOfWork.GetRepository<SubmissionDetail>()
+					.GetAll(sd => sd.SubmissionId == submissionId)
+					.Include(sd => sd.AssignmentQuestion)
+					.ThenInclude(aq => aq.Question)
+					.ThenInclude(q => q.Lesson)
+					.ThenInclude(q => q.KeyPoints)
+					.ToListAsync();
+
+				// 获取同作业的所有提交用于排名和成绩分布
+				var allSubmissions = await _unitOfWork.GetRepository<Submission>()
+					.GetAll(s => s.AssignmentId == submission.AssignmentId)
+					.ToListAsync();
+
+				// 映射基本信息
+				var result = _mapper.Map<StudentSubmissionDetailDto>(submission);
+				result.Assignment = assignment.Result as AssignmentDto ?? new AssignmentDto();
+
+				var errorQuestion = submissionDetails
+					.Where(sd => sd.IsCorrect == false && sd.AssignmentQuestion?.StructType == AssignmentStructType.Question && sd.AssignmentQuestion?.Question != null)
+					.ToList();
+
+				// 计算基础统计
+				result.TotalQuestions = submissionDetails.Select(x => x.AssignmentQuestion.StructType == AssignmentStructType.Question && x.AssignmentQuestion?.Question != null).Count();
+				result.ErrorCount = errorQuestion.Count;
+				result.CorrectCount = result.TotalQuestions - result.ErrorCount;
+				result.AccuracyRate = result.TotalQuestions > 0 ?
+					(float)result.CorrectCount / result.TotalQuestions : 0;
+
+				// 计算错误类型分布 - 只获取题目类型的错误
+				result.ErrorTypeDistribution = errorQuestion
+					.GroupBy(sd => sd.AssignmentQuestion.Question.Type.ToString())
+					.ToDictionary(g => g.Key, g => g.Count()); ;
+
+				// 计算错误类型成绩分布 - 只获取题目类型的错误
+				result.ErrorTypeScoreDistribution = errorQuestion
+					.GroupBy(sd => sd.AssignmentQuestion.Question.Type.ToString())
+					.ToDictionary(g => g.Key, g => g.Sum(sd => sd.PointsAwarded ?? 0));
+
+				// 计算成绩排名
+				var orderedSubmissions = allSubmissions
+					.OrderByDescending(s => s.OverallGrade)
+					.ToList();
+				result.TotalRank = orderedSubmissions.FindIndex(s => s.Id == submissionId) + 1;
+
+				SetBCorrect(result.Assignment, errorQuestion);
+				// 计算成绩分布
+				result.AllScores = allSubmissions.Select(s => s.OverallGrade).ToList();
+				result.AverageScore = submission.OverallGrade;
+				result.ClassAverageScore = allSubmissions.Average(s => s.OverallGrade);
+
+				// 计算课文错误分布
+				result.LessonErrorDistribution = errorQuestion
+					.Where(eq => eq.AssignmentQuestion.Question.Lesson != null)
+					.GroupBy(sd => sd.AssignmentQuestion.Question.Lesson.Title)
+					.ToDictionary(g => g.Key, g => g.Count());
+
+				// 计算关键点错误分布
+				result.KeyPointErrorDistribution = errorQuestion
+					.Where(eq => eq.AssignmentQuestion.Question.Lesson != null)
+					.GroupBy(sd => sd.AssignmentQuestion.Question.KeyPoint.Key)
+					.ToDictionary(g => g.Key, g => g.Count());
+
+				return ApiResponse.Success(result: result);
+			}
+			catch (Exception ex)
+			{
+				return ApiResponse.Error($"获取学生提交详细信息失败: {ex.Message}");
+			}
+		}
+
+		public void SetBCorrect(AssignmentDto assignment, List<SubmissionDetail> submissionDetails)
+		{
+			SetBCorrect(assignment.ExamStruct, submissionDetails);
+		}
+
+		public void SetBCorrect(AssignmentQuestionDto assignmentQuestion, List<SubmissionDetail> submissionDetails)
+		{
+			var sd = submissionDetails.FirstOrDefault(x => x.AssignmentQuestionId == assignmentQuestion.Id);
+			if (sd != null)
+				assignmentQuestion.BCorrect = sd.AssignmentQuestion.BCorrect;
+			else 
+				assignmentQuestion.BCorrect = false;
+
+			assignmentQuestion.ChildrenAssignmentQuestion?.ForEach(
+				cq => SetBCorrect(cq, submissionDetails));
+		}
+
+		//Task<ApiResponse> IStudentSubmissionDetailService.GetSubmissionDetailAsync(Guid submissionId)
+		//{
+		//	throw new NotImplementedException();
+		//}
+	}
+}