更新nuget&&添加swagger

src/Jiaowu.Api/Controllers/ApprovalsController.cs

@@ -1,6 +1,7 @@
 using System.ComponentModel.DataAnnotations;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Domain.System;
 using Jiaowu.Api.Infrastructure.Auth;
 using Jiaowu.Api.Infrastructure.Grades;
 using Jiaowu.Api.Infrastructure.Persistence;
@@ -250,6 +251,13 @@ public sealed class ApprovalsController(AppDbContext db, ICurrentUserDataScope s
         // Auto-apply: update grade record
         gm.GradeRecord!.TotalScore = gm.RequestedScore;
         gm.GradeRecord.GradePoint = GradeCalculator.CalculateGradePoint(gm.RequestedScore);
+        var statisticsJob = new CourseGradeStatisticsRefreshJob
+        {
+            GradeSheetId = gm.GradeRecord.GradeSheetId
+        };
+        db.CourseGradeStatisticsRefreshJobs.Add(statisticsJob);
+        db.BackgroundJobOutboxMessages.Add(BackgroundJobOutboxMessage.Create(
+            BackgroundJobKind.CourseGradeStatisticsRefresh, statisticsJob.Id));
         await db.SaveChangesAsync(ct);
         await NotificationService.SendAsync(
             db,

src/Jiaowu.Api/Controllers/GradeAnalyticsController.cs

@@ -0,0 +1,528 @@
+using Jiaowu.Api.Domain.Academic;
+using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Domain.System;
+using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
+using Jiaowu.Api.Infrastructure.Grades;
+using Jiaowu.Api.Infrastructure.Persistence;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace Jiaowu.Api.Controllers;
+
+[ApiController]
+[Authorize(Roles = AnalyticsUsers)]
+[Route("api/grade-analytics")]
+public sealed class GradeAnalyticsController(
+    AppDbContext db,
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache? cache = null) : ControllerBase
+{
+    private const string AnalyticsUsers =
+        SystemRoles.SuperAdmin + "," +
+        SystemRoles.AcademicAdmin + "," +
+        SystemRoles.CollegeAdmin + "," +
+        SystemRoles.Leader + "," +
+        SystemRoles.Teacher;
+
+    [HttpGet("teaching-classes")]
+    public async Task<ActionResult> GetTeachingClasses(
+        Guid? academicTermId,
+        string? keyword,
+        int page = 1,
+        int pageSize = 20,
+        CancellationToken cancellationToken = default)
+    {
+        page = Math.Max(1, page);
+        pageSize = Math.Clamp(pageSize, 1, 100);
+        keyword = string.IsNullOrWhiteSpace(keyword) ? null : keyword.Trim();
+
+        var source = db.TeachingTaskGradeStatistics.AsNoTracking()
+            .Where(x => VisibleTeachingTasks().Any(task => task.Id == x.TeachingTaskId));
+        if (academicTermId.HasValue)
+            source = source.Where(x => x.AcademicTermId == academicTermId);
+        if (keyword is not null)
+            source = source.Where(x =>
+                x.TeachingTask!.TaskNumber.Contains(keyword) ||
+                x.TeachingTask.Name.Contains(keyword) ||
+                x.TeachingTask.Course!.Code.Contains(keyword) ||
+                x.TeachingTask.Course.Name.Contains(keyword));
+
+        var total = await source.CountAsync(cancellationToken);
+        var items = await source
+            .OrderByDescending(x => x.TeachingTask!.AcademicTerm!.StartDate)
+            .ThenBy(x => x.TeachingTask!.Course!.Code)
+            .ThenBy(x => x.TeachingTask!.TaskNumber)
+            .Skip((page - 1) * pageSize)
+            .Take(pageSize)
+            .Select(x => new
+            {
+                x.GradeSheetId,
+                x.TeachingTaskId,
+                x.TeachingTask!.TaskNumber,
+                TaskName = x.TeachingTask.Name,
+                CourseCode = x.TeachingTask.Course!.Code,
+                CourseName = x.TeachingTask.Course.Name,
+                TermName = x.TeachingTask.AcademicTerm!.Name,
+                x.AcademicTermId,
+                TeacherNames = x.TeachingTask.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name),
+                ClassNames = x.TeachingTask.Classes
+                    .Select(item => item.AdministrativeClass!.Name),
+                x.StudentCount,
+                x.AverageScore,
+                x.PassRate,
+                x.ExcellentRate,
+                x.CalculatedAt
+            })
+            .ToListAsync(cancellationToken);
+
+        return Ok(new { Items = items, Total = total, Page = page, PageSize = pageSize });
+    }
+
+    [HttpGet("teaching-classes/{gradeSheetId:guid}")]
+    public async Task<ActionResult> GetTeachingClassAnalysis(
+        Guid gradeSheetId,
+        CancellationToken cancellationToken)
+    {
+        var sheet = await db.GradeSheets.AsNoTracking()
+            .Where(x => x.Id == gradeSheetId &&
+                        VisibleTeachingTasks().Any(task => task.Id == x.TeachingTaskId))
+            .Select(x => new AnalysisTarget(
+                x.Id,
+                x.TeachingTaskId,
+                x.TeachingTask!.CourseId,
+                x.TeachingTask.AcademicTermId,
+                x.TeachingTask.Course!.CollegeId,
+                x.TeachingTask.TaskNumber,
+                x.TeachingTask.Name,
+                x.TeachingTask.Course.Code,
+                x.TeachingTask.Course.Name,
+                x.TeachingTask.AcademicTerm!.Name))
+            .FirstOrDefaultAsync(cancellationToken);
+        if (sheet is null) return NotFound();
+
+        var report = await (cache ?? NoOpAppCache.Instance).GetOrCreateAsync(
+            AppCacheKeys.TeachingTaskGradeAnalytics(gradeSheetId),
+            token => BuildReportAsync(sheet, token),
+            AppCacheProfile.Analytics,
+            [AppCacheTags.CourseGradeStatistics],
+            cancellationToken);
+        return Ok(report);
+    }
+
+    [HttpGet("teaching-classes/{gradeSheetId:guid}/report.docx")]
+    public async Task<ActionResult> ExportTeachingClassAnalysisReport(
+        Guid gradeSheetId,
+        CancellationToken cancellationToken)
+    {
+        var sheet = await db.GradeSheets.AsNoTracking()
+            .Where(x => x.Id == gradeSheetId &&
+                        VisibleTeachingTasks().Any(task => task.Id == x.TeachingTaskId))
+            .Select(x => new AnalysisTarget(
+                x.Id,
+                x.TeachingTaskId,
+                x.TeachingTask!.CourseId,
+                x.TeachingTask.AcademicTermId,
+                x.TeachingTask.Course!.CollegeId,
+                x.TeachingTask.TaskNumber,
+                x.TeachingTask.Name,
+                x.TeachingTask.Course.Code,
+                x.TeachingTask.Course.Name,
+                x.TeachingTask.AcademicTerm!.Name))
+            .FirstOrDefaultAsync(cancellationToken);
+        if (sheet is null) return NotFound();
+
+        var report = await (cache ?? NoOpAppCache.Instance).GetOrCreateAsync(
+            AppCacheKeys.TeachingTaskGradeAnalytics(gradeSheetId),
+            token => BuildReportAsync(sheet, token),
+            AppCacheProfile.Analytics,
+            [AppCacheTags.CourseGradeStatistics],
+            cancellationToken);
+        if (report.IsRefreshing || report.Summary is null)
+            return Conflict(new ProblemDetails
+            {
+                Title = "成绩统计尚未生成",
+                Detail = "请先重新计算当前教学班，待统计完成后再导出。",
+                Status = StatusCodes.Status409Conflict
+            });
+
+        var content = GradeAnalysisWordReportGenerator.Generate(report, DateTime.Now);
+        var fileName = $"{SanitizeFileName(report.CourseCode)}-{SanitizeFileName(report.TaskNumber)}-成绩分析报告.docx";
+        return File(
+            content,
+            "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+            fileName);
+    }
+
+    [HttpPost("teaching-classes/{gradeSheetId:guid}/refresh")]
+    public async Task<ActionResult> RefreshTeachingClassAnalysis(
+        Guid gradeSheetId,
+        CancellationToken cancellationToken)
+    {
+        var exists = await db.GradeSheets.AsNoTracking()
+            .AnyAsync(x => x.Id == gradeSheetId &&
+                VisibleTeachingTasks().Any(task => task.Id == x.TeachingTaskId),
+                cancellationToken);
+        if (!exists) return NotFound();
+
+        var job = new CourseGradeStatisticsRefreshJob { GradeSheetId = gradeSheetId };
+        db.CourseGradeStatisticsRefreshJobs.Add(job);
+        db.BackgroundJobOutboxMessages.Add(BackgroundJobOutboxMessage.Create(
+            BackgroundJobKind.CourseGradeStatisticsRefresh,
+            job.Id));
+        await db.SaveChangesAsync(cancellationToken);
+        return Accepted(new { job.Id });
+    }
+
+    private async Task<TeachingClassAnalysisReport> BuildReportAsync(
+        AnalysisTarget target,
+        CancellationToken cancellationToken)
+    {
+        var statistic = await db.TeachingTaskGradeStatistics.AsNoTracking()
+            .Where(x => x.GradeSheetId == target.GradeSheetId)
+            .Select(x => new TeachingClassMetrics(
+                x.StudentCount,
+                x.PassedCount,
+                x.ExcellentCount,
+                x.HighestScore,
+                x.AverageScore,
+                x.MedianScore,
+                x.LowestScore,
+                x.StandardDeviation,
+                x.PassRate,
+                x.ExcellentRate,
+                x.CalculatedAt,
+                x.ScoreBands.OrderBy(band => band.SortOrder)
+                    .Select(band => new ScoreBand(
+                        band.Label,
+                        band.LowerBound,
+                        band.UpperBound,
+                        band.StudentCount))
+                    .ToArray()))
+            .FirstOrDefaultAsync(cancellationToken);
+
+        if (statistic is null)
+            return new TeachingClassAnalysisReport(
+                true,
+                target.GradeSheetId,
+                target.TeachingTaskId,
+                target.TaskNumber,
+                target.TaskName,
+                target.CourseCode,
+                target.CourseName,
+                target.TermName,
+                null,
+                [],
+                [],
+                [],
+                null);
+
+        var peerRows = await db.TeachingTaskGradeStatistics.AsNoTracking()
+            .Where(x => x.CourseId == target.CourseId &&
+                        x.AcademicTermId == target.AcademicTermId)
+            .OrderByDescending(x => x.AverageScore)
+            .Select(x => new
+            {
+                x.GradeSheetId,
+                x.TeachingTaskId,
+                x.TeachingTask!.TaskNumber,
+                TaskName = x.TeachingTask.Name,
+                TeacherNames = x.TeachingTask.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name).ToArray(),
+                ClassNames = x.TeachingTask.Classes
+                    .Select(item => item.AdministrativeClass!.Name).ToArray(),
+                x.StudentCount,
+                x.HighestScore,
+                x.AverageScore,
+                x.MedianScore,
+                x.LowestScore,
+                x.StandardDeviation,
+                x.PassRate,
+                x.ExcellentRate
+            })
+            .ToListAsync(cancellationToken);
+        var peers = peerRows.Select(x => new TeachingClassComparison(
+            x.GradeSheetId,
+            x.TeachingTaskId,
+            x.TaskNumber,
+            x.TaskName,
+            string.Join("、", x.TeacherNames),
+            string.Join("、", x.ClassNames),
+            x.StudentCount,
+            x.HighestScore,
+            x.AverageScore,
+            x.MedianScore,
+            x.LowestScore,
+            x.StandardDeviation,
+            x.PassRate,
+            x.ExcellentRate,
+            x.GradeSheetId == target.GradeSheetId)).ToArray();
+
+        var classProfiles = await db.GradeRecords.AsNoTracking()
+            .Where(x => x.GradeSheetId == target.GradeSheetId)
+            .Select(x => new ClassProfile(
+                x.Student!.AdministrativeClassId,
+                x.Student.AdministrativeClass!.Name,
+                x.Student.AdministrativeClass.MajorId,
+                x.Student.AdministrativeClass.Major!.Name,
+                x.Student.AdministrativeClass.Major.CollegeId,
+                x.Student.AdministrativeClass.Major.College!.Name))
+            .Distinct()
+            .ToListAsync(cancellationToken);
+        var scopeStatistics = await db.CourseGradeStatistics.AsNoTracking()
+            .Where(x => x.CourseId == target.CourseId &&
+                        x.AcademicTermId == target.AcademicTermId)
+            .ToListAsync(cancellationToken);
+        var benchmarks = BuildBenchmarks(classProfiles, scopeStatistics);
+
+        var selectedTeacherIds = await db.TeachingTaskTeachers.AsNoTracking()
+            .Where(x => x.TeachingTaskId == target.TeachingTaskId)
+            .Select(x => x.TeacherId)
+            .ToListAsync(cancellationToken);
+        var historicalTaskRows = await db.TeachingTaskGradeStatistics.AsNoTracking()
+            .Where(x => x.CourseId == target.CourseId &&
+                        x.TeachingTask!.Teachers.Any(link =>
+                            selectedTeacherIds.Contains(link.TeacherId)))
+            .Select(x => new
+            {
+                x.AcademicTermId,
+                TermName = x.TeachingTask!.AcademicTerm!.Name,
+                x.TeachingTask.AcademicTerm.StartDate,
+                x.StudentCount,
+                x.PassedCount,
+                x.ExcellentCount,
+                x.AverageScore
+            })
+            .ToListAsync(cancellationToken);
+        var courseHistory = await db.CourseGradeStatistics.AsNoTracking()
+            .Where(x => x.CourseId == target.CourseId &&
+                        x.Scope == CourseGradeStatisticScope.University)
+            .Select(x => new
+            {
+                x.AcademicTermId,
+                TermName = db.AcademicTerms.Where(term => term.Id == x.AcademicTermId)
+                    .Select(term => term.Name).First(),
+                StartDate = db.AcademicTerms.Where(term => term.Id == x.AcademicTermId)
+                    .Select(term => term.StartDate).First(),
+                x.StudentCount,
+                x.AverageScore,
+                x.PassRate,
+                ExcellentRate = x.StudentCount == 0 ? 0m :
+                    Math.Round((decimal)x.From90To100Count / x.StudentCount * 100m, 2)
+            })
+            .ToListAsync(cancellationToken);
+
+        var teacherByTerm = historicalTaskRows
+            .GroupBy(x => new { x.AcademicTermId, x.TermName, x.StartDate })
+            .ToDictionary(group => group.Key.AcademicTermId, group =>
+            {
+                var count = group.Sum(x => x.StudentCount);
+                return new HistoricalSeriesValue(
+                    count,
+                    count == 0 ? 0m : Math.Round(
+                        group.Sum(x => x.AverageScore * x.StudentCount) / count, 1),
+                    count == 0 ? 0m : Math.Round(
+                        (decimal)group.Sum(x => x.PassedCount) / count * 100m, 2),
+                    count == 0 ? 0m : Math.Round(
+                        (decimal)group.Sum(x => x.ExcellentCount) / count * 100m, 2));
+            });
+        var history = courseHistory
+            .OrderBy(x => x.StartDate)
+            .Select(x => new HistoricalComparison(
+                x.AcademicTermId,
+                x.TermName,
+                x.StudentCount,
+                x.AverageScore,
+                x.PassRate,
+                x.ExcellentRate,
+                teacherByTerm.GetValueOrDefault(x.AcademicTermId)))
+            .ToArray();
+
+        var university = scopeStatistics.FirstOrDefault(x =>
+            x.Scope == CourseGradeStatisticScope.University);
+        return new TeachingClassAnalysisReport(
+            false,
+            target.GradeSheetId,
+            target.TeachingTaskId,
+            target.TaskNumber,
+            target.TaskName,
+            target.CourseCode,
+            target.CourseName,
+            target.TermName,
+            statistic,
+            peers,
+            benchmarks,
+            history,
+            university is null ? null : new ComparisonDelta(
+                Math.Round(statistic.AverageScore - university.AverageScore, 1),
+                Math.Round(statistic.PassRate - university.PassRate, 2),
+                university.AverageScore,
+                university.PassRate));
+    }
+
+    private static ScopeBenchmark[] BuildBenchmarks(
+        IEnumerable<ClassProfile> classProfiles,
+        IReadOnlyCollection<CourseGradeStatistic> statistics)
+    {
+        var profiles = classProfiles.ToArray();
+        var rows = new List<ScopeBenchmark>();
+        foreach (var profile in profiles)
+            AddBenchmark(rows, statistics, CourseGradeStatisticScope.AdministrativeClass,
+                profile.ClassId, "行政班", profile.ClassName);
+        foreach (var profile in profiles.GroupBy(x => x.MajorId).Select(x => x.First()))
+            AddBenchmark(rows, statistics, CourseGradeStatisticScope.Major,
+                profile.MajorId, "专业", profile.MajorName);
+        foreach (var profile in profiles.GroupBy(x => x.CollegeId).Select(x => x.First()))
+            AddBenchmark(rows, statistics, CourseGradeStatisticScope.College,
+                profile.CollegeId, "学院", profile.CollegeName);
+        AddBenchmark(rows, statistics, CourseGradeStatisticScope.University,
+            null, "全校", "全校同课程");
+        return rows.ToArray();
+    }
+
+    private static void AddBenchmark(
+        ICollection<ScopeBenchmark> target,
+        IEnumerable<CourseGradeStatistic> source,
+        CourseGradeStatisticScope scope,
+        Guid? entityId,
+        string scopeLabel,
+        string name)
+    {
+        var item = source.FirstOrDefault(x =>
+            x.Scope == scope && x.ScopeEntityId == entityId);
+        if (item is null || target.Any(x => x.Scope == scopeLabel && x.Name == name)) return;
+        target.Add(new ScopeBenchmark(
+            scopeLabel,
+            name,
+            item.StudentCount,
+            item.HighestScore,
+            item.AverageScore,
+            item.LowestScore,
+            item.PassRate));
+    }
+
+    private IQueryable<TeachingTask> VisibleTeachingTasks()
+    {
+        var scope = currentUserDataScope.Current;
+        var source = db.TeachingTasks.AsQueryable();
+        if (scope.Scope == DataScope.All) return source;
+        if (scope.Scope == DataScope.College)
+            return source.Where(x => x.Course!.CollegeId == scope.RestrictedCollegeId);
+        if (scope.IsInRole(SystemRoles.Teacher))
+            return source.Where(x =>
+                x.Teachers.Any(link => link.Teacher!.UserId == scope.UserId));
+        return source.Where(_ => false);
+    }
+
+    private static string SanitizeFileName(string value)
+    {
+        var invalid = Path.GetInvalidFileNameChars();
+        return string.Concat(value.Select(character => invalid.Contains(character) ? '_' : character));
+    }
+
+    private sealed record AnalysisTarget(
+        Guid GradeSheetId,
+        Guid TeachingTaskId,
+        Guid CourseId,
+        Guid AcademicTermId,
+        Guid CourseCollegeId,
+        string TaskNumber,
+        string TaskName,
+        string CourseCode,
+        string CourseName,
+        string TermName);
+
+    private sealed record ClassProfile(
+        Guid ClassId,
+        string ClassName,
+        Guid MajorId,
+        string MajorName,
+        Guid CollegeId,
+        string CollegeName);
+
+    public sealed record ScoreBand(
+        string Label,
+        decimal LowerBound,
+        decimal? UpperBound,
+        int StudentCount);
+
+    public sealed record TeachingClassMetrics(
+        int StudentCount,
+        int PassedCount,
+        int ExcellentCount,
+        decimal HighestScore,
+        decimal AverageScore,
+        decimal MedianScore,
+        decimal LowestScore,
+        decimal StandardDeviation,
+        decimal PassRate,
+        decimal ExcellentRate,
+        DateTime CalculatedAt,
+        IReadOnlyList<ScoreBand> ScoreBands);
+
+    public sealed record TeachingClassComparison(
+        Guid GradeSheetId,
+        Guid TeachingTaskId,
+        string TaskNumber,
+        string TaskName,
+        string TeacherNames,
+        string ClassNames,
+        int StudentCount,
+        decimal HighestScore,
+        decimal AverageScore,
+        decimal MedianScore,
+        decimal LowestScore,
+        decimal StandardDeviation,
+        decimal PassRate,
+        decimal ExcellentRate,
+        bool IsSelected);
+
+    public sealed record ScopeBenchmark(
+        string Scope,
+        string Name,
+        int StudentCount,
+        decimal HighestScore,
+        decimal AverageScore,
+        decimal LowestScore,
+        decimal PassRate);
+
+    public sealed record HistoricalSeriesValue(
+        int StudentCount,
+        decimal AverageScore,
+        decimal PassRate,
+        decimal ExcellentRate);
+
+    public sealed record HistoricalComparison(
+        Guid AcademicTermId,
+        string TermName,
+        int CourseStudentCount,
+        decimal CourseAverageScore,
+        decimal CoursePassRate,
+        decimal CourseExcellentRate,
+        HistoricalSeriesValue? Instructor);
+
+    public sealed record ComparisonDelta(
+        decimal AverageScoreDifference,
+        decimal PassRateDifference,
+        decimal UniversityAverageScore,
+        decimal UniversityPassRate);
+
+    public sealed record TeachingClassAnalysisReport(
+        bool IsRefreshing,
+        Guid GradeSheetId,
+        Guid TeachingTaskId,
+        string TaskNumber,
+        string TaskName,
+        string CourseCode,
+        string CourseName,
+        string TermName,
+        TeachingClassMetrics? Summary,
+        IReadOnlyList<TeachingClassComparison> PeerTeachingClasses,
+        IReadOnlyList<ScopeBenchmark> ScopeBenchmarks,
+        IReadOnlyList<HistoricalComparison> History,
+        ComparisonDelta? UniversityDelta);
+}

src/Jiaowu.Api/Controllers/GradesController.cs

@@ -3,7 +3,9 @@ using System.Globalization;
 using Jiaowu.Api.Contracts;
 using Jiaowu.Api.Domain.Academic;
 using Jiaowu.Api.Domain.Identity;
+using Jiaowu.Api.Domain.System;
 using Jiaowu.Api.Infrastructure.Auth;
+using Jiaowu.Api.Infrastructure.Caching;
 using Jiaowu.Api.Infrastructure.Excel;
 using Jiaowu.Api.Infrastructure.Grades;
 using Jiaowu.Api.Infrastructure.Persistence;
@@ -19,7 +21,8 @@ namespace Jiaowu.Api.Controllers;
 [Route("api/grades")]
 public sealed class GradesController(
     AppDbContext db,
-    ICurrentUserDataScope currentUserDataScope) : ControllerBase
+    ICurrentUserDataScope currentUserDataScope,
+    IAppCache? cache = null) : ControllerBase
 {
     private const string SheetUsers =
         SystemRoles.SuperAdmin + "," +
@@ -37,6 +40,9 @@ public sealed class GradesController(
         SystemRoles.SuperAdmin + "," +
         SystemRoles.AcademicAdmin;
 
+    private const string StatisticsUsers =
+        SheetUsers + "," + SystemRoles.Leader + "," + SystemRoles.Student;
+
     [HttpGet("sheets")]
     [Authorize(Roles = SheetUsers)]
     public async Task<ActionResult> GetSheets(
@@ -502,6 +508,7 @@ public sealed class GradesController(
         }
         targetItem.SourceType = GradeItemSourceType.ExperimentSummary;
         targetItem.SourceSnapshotAt = DateTime.UtcNow;
+        QueueCourseStatisticsRefresh(sheet.Id);
         await db.SaveChangesAsync(cancellationToken);
         return Ok(new
         {
@@ -661,6 +668,7 @@ public sealed class GradesController(
             return ConflictProblem("只有审核通过的成绩单可以发布。");
         sheet.Status = GradeSheetStatus.Published;
         sheet.PublishedAt = DateTime.UtcNow;
+        QueueCourseStatisticsRefresh(sheet.Id);
 
         // The grade sheet roster is authoritative at publication time. This also
         // covers students added through approved roster corrections.
@@ -699,7 +707,7 @@ public sealed class GradesController(
         var itemNames = sheet.Items.Select(i => i.Name).ToList();
         var headers = new List<string> { "学号", "姓名", "班级", "平时成绩" };
         headers.AddRange(itemNames);
-        headers.AddRange(["期末成绩", "考试状态", "备注"]);
+        headers.AddRange(["总分（自动计算）", "期末成绩", "考试状态", "备注"]);
 
         var rows = sheet.Records.Select(record =>
         {
@@ -716,6 +724,7 @@ public sealed class GradesController(
                     .FirstOrDefault(s => s.GradeItemId == item.Id)?.Score;
                 values.Add(score);
             }
+            values.Add(null);
             values.Add(record.FinalScore);
             values.Add(record.ExamStatus == GradeExamStatus.Normal ? "正常" :
                 record.ExamStatus == GradeExamStatus.Absent ? "缺考" :
@@ -729,13 +738,56 @@ public sealed class GradesController(
         {
             "请勿修改第一行列名；学号、姓名、班级列请勿修改，用于匹配学生。",
             "成绩列填写 0—100 的数值，留空表示暂未录入。",
+            "总分（自动计算）列由 Excel 按各部分比例自动计算，仅供填写时预览；上传时系统不会采用该列结果。",
             "考试状态填写：正常、缺考、缓考 或 免修，留空默认为正常。",
             $"本成绩单共 {sheet.Items.Count} 个分项：{string.Join("、", itemNames)}。",
             "导入后会自动重新计算总评成绩和绩点。"
         };
 
+        var regularColumn = 4;
+        var itemColumns = Enumerable.Range(5, sheet.Items.Count).ToArray();
+        var totalColumn = regularColumn + itemColumns.Length + 1;
+        var finalColumn = totalColumn + 1;
+        var statusColumn = finalColumn + 1;
+        var weightedColumns = new List<(int Column, decimal Weight)> { (regularColumn, sheet.RegularWeight) };
+        weightedColumns.AddRange(sheet.Items.Select((item, index) =>
+            (itemColumns[index], item.Weight)));
+        weightedColumns.Add((finalColumn, sheet.FinalWeight));
+        var requiredColumns = weightedColumns.Where(x => x.Weight > 0).ToArray();
+        var scoreColumns = weightedColumns.Select(x => x.Column)
+            .Append(totalColumn)
+            .ToArray();
+
         var bytes = ExcelWorkbookHelper.Create(
-            "成绩导入", headers, rows, instructions);
+            "成绩导入", headers, rows, instructions,
+            (worksheet, rowNumber) =>
+            {
+                var componentReferences = requiredColumns
+                    .Select(x => $"{ColumnLetter(x.Column)}{rowNumber}")
+                    .ToArray();
+                var weightedExpression = string.Join("+", weightedColumns.Select(x =>
+                    $"{ColumnLetter(x.Column)}{rowNumber}*{x.Weight.ToString(CultureInfo.InvariantCulture)}/100"));
+                var statusReference = $"{ColumnLetter(statusColumn)}{rowNumber}";
+                var formula =
+                    $"=IF(OR({statusReference}=\"缺考\",{statusReference}=\"缓考\",{statusReference}=\"免修\"),\"\",IF(COUNT({string.Join(",", componentReferences)})={requiredColumns.Length},ROUND({weightedExpression},1),\"\"))";
+                var cell = worksheet.Cell(rowNumber, totalColumn);
+                cell.FormulaA1 = formula;
+                cell.Style.NumberFormat.Format = "0.0";
+                cell.Style.Font.Bold = true;
+                cell.Style.Fill.BackgroundColor = ClosedXML.Excel.XLColor.FromHtml("#E8F1FB");
+
+                foreach (var scoreColumn in scoreColumns)
+                {
+                    var conditionalFormat = worksheet
+                        .Range(rowNumber, scoreColumn, rowNumber, scoreColumn)
+                        .AddConditionalFormat();
+                    var failingScoreFormat = conditionalFormat.WhenLessThan(60);
+                    failingScoreFormat.Fill.BackgroundColor =
+                        ClosedXML.Excel.XLColor.FromHtml("#FDECEC");
+                    failingScoreFormat.Font.FontColor =
+                        ClosedXML.Excel.XLColor.FromHtml("#B42318");
+                }
+            });
         var taskName = sheet.TeachingTask!.Name;
         return File(bytes, ExcelWorkbookHelper.ContentType,
             $"成绩导入模板-{taskName}.xlsx");
@@ -768,13 +820,15 @@ public sealed class GradesController(
         var itemNames = sheet.Items.Select(i => i.Name).ToList();
         var headers = new List<string> { "学号", "姓名", "班级", "平时成绩" };
         headers.AddRange(itemNames);
-        headers.AddRange(["期末成绩", "考试状态", "备注"]);
+        headers.AddRange(["总分（自动计算）", "期末成绩", "考试状态", "备注"]);
 
         IReadOnlyList<ExcelRow> rows;
         try
         {
             rows = await ExcelWorkbookHelper.ReadAsync(
-                file, headers, cancellationToken);
+                file,
+                headers.Where(x => x != "总分（自动计算）").ToArray(),
+                cancellationToken);
         }
         catch (InvalidDataException exception)
         {
@@ -810,7 +864,7 @@ public sealed class GradesController(
             var regularScore = ParseOptionalDecimal(row, "平时成绩", 0, 100, errors);
             if (errors.Count > 0 && errors[^1].Contains(row.RowNumber.ToString())) continue;
 
-            // Parse final score
+            // Parse final score. The formula-driven total column is intentionally ignored.
             var finalScore = ParseOptionalDecimal(row, "期末成绩", 0, 100, errors);
             if (errors.Count > 0 && errors[^1].Contains(row.RowNumber.ToString())) continue;
 
@@ -864,6 +918,7 @@ public sealed class GradesController(
         if (errors.Count > 0)
             return ImportValidationProblem(errors);
 
+        QueueCourseStatisticsRefresh(sheet.Id);
         await db.SaveChangesAsync(cancellationToken);
         return Ok(new { updated, total = rows.Count });
     }
@@ -902,6 +957,7 @@ public sealed class GradesController(
             .Select(x => new
             {
                 x.Id,
+                GradeSheetId = x.GradeSheetId,
                 AcademicTermId = x.GradeSheet!.TeachingTask!.AcademicTermId,
                 TermName = x.GradeSheet.TeachingTask.AcademicTerm!.Name,
                 x.GradeSheet.TeachingTaskId,
@@ -918,6 +974,121 @@ public sealed class GradesController(
         return Ok(new { Student = student, Records = records });
     }
 
+    [HttpGet("sheets/{id:guid}/statistics")]
+    [Authorize(Roles = StatisticsUsers)]
+    public async Task<ActionResult> GetCourseStatistics(
+        Guid id,
+        CancellationToken cancellationToken)
+    {
+        var scope = currentUserDataScope.Current;
+        var sheet = await db.GradeSheets.AsNoTracking()
+            .Where(x => x.Id == id)
+            .Select(x => new
+            {
+                x.Id,
+                x.Status,
+                x.TeachingTask!.CourseId,
+                x.TeachingTask.AcademicTermId,
+                CourseName = x.TeachingTask.Course!.Name,
+                CourseCode = x.TeachingTask.Course.Code,
+                TermName = x.TeachingTask.AcademicTerm!.Name
+            })
+            .FirstOrDefaultAsync(cancellationToken);
+        if (sheet is null) return NotFound();
+
+        Guid? classId = null;
+        Guid? majorId = null;
+        Guid? collegeId = null;
+        if (scope.IsInRole(SystemRoles.Student))
+        {
+            if (sheet.Status != GradeSheetStatus.Published)
+                return NotFound();
+            var student = await db.GradeRecords.AsNoTracking()
+                .Where(x => x.GradeSheetId == id && x.Student!.UserId == scope.UserId)
+                .Select(x => new
+                {
+                    x.Student!.AdministrativeClassId,
+                    MajorId = x.Student.AdministrativeClass!.MajorId,
+                    CollegeId = x.Student.AdministrativeClass.Major!.CollegeId
+                })
+                .FirstOrDefaultAsync(cancellationToken);
+            if (student is null) return Forbid();
+            classId = student.AdministrativeClassId;
+            majorId = student.MajorId;
+            collegeId = student.CollegeId;
+        }
+        else if (scope.Scope == DataScope.College)
+        {
+            collegeId = scope.RestrictedCollegeId;
+            if (collegeId == Guid.Empty || !scope.CanAccessCollege(
+                    await db.Courses.Where(x => x.Id == sheet.CourseId)
+                        .Select(x => x.CollegeId).FirstAsync(cancellationToken)))
+                return Forbid();
+        }
+        else if (scope.IsInRole(SystemRoles.Counselor))
+        {
+            var allowedClassIds = await db.AdministrativeClasses.AsNoTracking()
+                .Where(x => x.CounselorUserId == scope.UserId)
+                .Select(x => x.Id)
+                .ToListAsync(cancellationToken);
+            if (allowedClassIds.Count == 0) return Forbid();
+            // A counselor sees their classes plus the matching major/college
+            // benchmarks, never an unrelated class-level statistic.
+            classId = allowedClassIds.First();
+            majorId = await db.AdministrativeClasses.Where(x => x.Id == classId)
+                .Select(x => x.MajorId).FirstAsync(cancellationToken);
+            collegeId = await db.Majors.Where(x => x.Id == majorId)
+                .Select(x => x.CollegeId).FirstAsync(cancellationToken);
+        }
+
+        var cacheKey = AppCacheKeys.CourseGradeStatistics(id);
+        var statistics = await (cache ?? NoOpAppCache.Instance).GetOrCreateAsync(cacheKey, async token =>
+        {
+            var source = db.CourseGradeStatistics.AsNoTracking()
+                .Where(x => x.CourseId == sheet.CourseId &&
+                            x.AcademicTermId == sheet.AcademicTermId);
+            return await source.Select(x => new
+            {
+                x.Scope, x.ScopeEntityId, x.StudentCount, x.PassedCount,
+                x.Below60Count, x.From60To69Count, x.From70To79Count,
+                x.From80To89Count, x.From90To100Count,
+                x.HighestScore, x.AverageScore, x.LowestScore, x.PassRate,
+                x.CalculatedAt
+            }).ToListAsync(token);
+        }, AppCacheProfile.Analytics,
+        [AppCacheTags.CourseGradeStatistics], cancellationToken);
+
+        object? Find(CourseGradeStatisticScope statisticScope, Guid? entityId)
+        {
+            var item = statistics.FirstOrDefault(x => x.Scope == statisticScope &&
+                x.ScopeEntityId == entityId);
+            return item is null ? null : new
+            {
+                item.Scope, item.ScopeEntityId, item.StudentCount, item.PassedCount,
+                item.HighestScore, item.AverageScore, item.LowestScore, item.PassRate,
+                item.CalculatedAt,
+                Distribution = new[]
+                {
+                    new { Range = "0–59", Count = item.Below60Count },
+                    new { Range = "60–69", Count = item.From60To69Count },
+                    new { Range = "70–79", Count = item.From70To79Count },
+                    new { Range = "80–89", Count = item.From80To89Count },
+                    new { Range = "90–100", Count = item.From90To100Count }
+                }
+            };
+        }
+        return Ok(new
+        {
+            sheet.CourseName, sheet.CourseCode, sheet.TermName,
+            IsRefreshing = !statistics.Any(),
+            Class = classId.HasValue ? Find(CourseGradeStatisticScope.AdministrativeClass, classId) : null,
+            Major = majorId.HasValue ? Find(CourseGradeStatisticScope.Major, majorId) : null,
+            College = collegeId.HasValue ? Find(CourseGradeStatisticScope.College, collegeId) : null,
+            University = scope.Scope == DataScope.All || scope.IsInRole(SystemRoles.Student)
+                ? Find(CourseGradeStatisticScope.University, null) : null
+        });
+    }
+
     private IQueryable<TeachingTask> AccessibleTasks()
     {
         var source = db.TeachingTasks.AsQueryable();
@@ -990,6 +1161,7 @@ public sealed class GradesController(
     {
         try
         {
+            QueueCourseStatisticsRefresh(id);
             await db.SaveChangesAsync(cancellationToken);
             return created ? Created(string.Empty, new { id }) : NoContent();
         }
@@ -999,6 +1171,14 @@ public sealed class GradesController(
         }
     }
 
+    private void QueueCourseStatisticsRefresh(Guid gradeSheetId)
+    {
+        var job = new CourseGradeStatisticsRefreshJob { GradeSheetId = gradeSheetId };
+        db.CourseGradeStatisticsRefreshJobs.Add(job);
+        db.BackgroundJobOutboxMessages.Add(BackgroundJobOutboxMessage.Create(
+            BackgroundJobKind.CourseGradeStatisticsRefresh, job.Id));
+    }
+
     private ActionResult ConflictProblem(string detail) =>
         Conflict(new ProblemDetails
         {
@@ -1041,6 +1221,18 @@ public sealed class GradesController(
 
     private static string? Normalize(string? value) =>
         string.IsNullOrWhiteSpace(value) ? null : value.Trim();
+
+    private static string ColumnLetter(int column)
+    {
+        var result = string.Empty;
+        while (column > 0)
+        {
+            column--;
+            result = (char)('A' + column % 26) + result;
+            column /= 26;
+        }
+        return result;
+    }
 }
 
 public sealed record GradeSheetRequest(