选课

src/Jiaowu.Api/Controllers/CourseSelectionsController.cs

@@ -499,7 +499,8 @@ public sealed class CourseSelectionsController(
             round.AcademicTermId,
             [task.Id],
             cancellationToken);
-        if (candidateEntries.Count == 0)
+        if (CourseSelectionRules.RequiresPublishedSchedule(task.SchedulingMode) &&
+            candidateEntries.Count == 0)
             return ConflictProblem("该教学班尚未发布课表，暂时不能办理代选。");
 
         foreach (var student in students)
@@ -804,7 +805,7 @@ public sealed class CourseSelectionsController(
             round.AcademicTermId,
             [task.Id],
             cancellationToken);
-        if (task.SchedulingMode == TeachingTaskSchedulingMode.Standard &&
+        if (CourseSelectionRules.RequiresPublishedSchedule(task.SchedulingMode) &&
             candidateEntries.Count == 0)
              return ConflictProblem("该教学班尚未发布课表，暂时不能选课。");
         var selectedTaskIds = await db.CourseEnrollments

src/Jiaowu.Api/Controllers/TeachingTasksController.cs

@@ -95,6 +95,47 @@ public sealed class TeachingTasksController(
         return Ok(new PagedResult<object>(items, total, page, pageSize));
     }
 
+    [HttpGet("options")]
+    public async Task<ActionResult> GetOptions(
+        Guid academicTermId,
+        TeachingTaskStatus status = TeachingTaskStatus.Published,
+        CancellationToken cancellationToken = default)
+    {
+        var items = await ScopedTasks()
+            .AsNoTracking()
+            .Where(x =>
+                x.AcademicTermId == academicTermId &&
+                x.Status == status)
+            .OrderBy(x => x.Course!.Code)
+            .ThenBy(x => x.TaskNumber)
+            .Select(x => new
+            {
+                x.Id,
+                x.TaskNumber,
+                x.Name,
+                x.AcademicTermId,
+                x.CourseId,
+                CourseCode = x.Course!.Code,
+                CourseName = x.Course.Name,
+                CourseNature = x.Course.Nature,
+                CollegeId = x.Course.CollegeId,
+                CollegeName = x.Course.College!.Name,
+                x.Capacity,
+                x.StartWeek,
+                x.EndWeek,
+                x.WeeklyHours,
+                x.SchedulingMode,
+                TeacherNames = x.Teachers
+                    .OrderByDescending(item => item.IsPrimary)
+                    .Select(item => item.Teacher!.Name),
+                ClassNames = x.Classes
+                    .OrderBy(item => item.AdministrativeClass!.Code)
+                    .Select(item => item.AdministrativeClass!.Name)
+            })
+            .ToListAsync(cancellationToken);
+        return Ok(items);
+    }
+
     [HttpGet("{id:guid}")]
     public async Task<ActionResult> GetOne(Guid id, CancellationToken cancellationToken)
     {

src/Jiaowu.Api/Infrastructure/CourseSelection/CourseSelectionRules.cs

@@ -17,6 +17,9 @@ public static class CourseSelectionRules
     public static bool SupportsProxyEnrollment(CourseNature nature) =>
         nature == CourseNature.GeneralRequired;
 
+    public static bool RequiresPublishedSchedule(TeachingTaskSchedulingMode schedulingMode) =>
+        schedulingMode == TeachingTaskSchedulingMode.Standard;
+
     public static bool HasScheduleConflict(
         IEnumerable<ScheduleEntry> candidateEntries,
         IEnumerable<ScheduleEntry> selectedEntries) =>

tests/Jiaowu.Api.Tests/CourseSelectionRulesTests.cs

@@ -66,6 +66,18 @@ public sealed class CourseSelectionRulesTests
         Assert.Equal(expected, CourseSelectionRules.SupportsProxyEnrollment(nature));
     }
 
+    [Theory]
+    [InlineData(TeachingTaskSchedulingMode.Standard, true)]
+    [InlineData(TeachingTaskSchedulingMode.Flexible, false)]
+    public void Only_standard_courses_require_a_published_schedule(
+        TeachingTaskSchedulingMode schedulingMode,
+        bool expected)
+    {
+        Assert.Equal(
+            expected,
+            CourseSelectionRules.RequiresPublishedSchedule(schedulingMode));
+    }
+
     private static CourseSelectionRound CreateRound(DateTime startsAt, DateTime endsAt) =>
         new()
         {

tests/Jiaowu.Api.Tests/TeachingTasksControllerTests.cs

@@ -65,6 +65,68 @@ public sealed class TeachingTasksControllerTests
             task => Assert.Equal(TeachingTaskStatus.Published, task.Status));
     }
 
+    [Fact]
+    public async Task Options_ReturnsAllPublishedTasksWithoutListPageTruncation()
+    {
+        await using var database = await TestDatabase.CreateAsync();
+        for (var index = 1; index <= 125; index++)
+        {
+            await database.AddTaskAsync(
+                $"OPTION-{index:D3}",
+                TeachingTaskStatus.Published);
+        }
+        await database.AddTaskAsync("DRAFT", TeachingTaskStatus.Draft);
+
+        var result = await database.Controller.GetOptions(
+            database.TermId,
+            TeachingTaskStatus.Published,
+            CancellationToken.None);
+
+        var ok = Assert.IsType<OkObjectResult>(result);
+        var items = Assert.IsAssignableFrom<System.Collections.IEnumerable>(ok.Value);
+        Assert.Equal(125, items.Cast<object>().Count());
+    }
+
+    [Fact]
+    public async Task Options_PreservesCollegeDataScope()
+    {
+        await using var database = await TestDatabase.CreateAsync(collegeScoped: true);
+        await database.AddTaskAsync("IN-SCOPE", TeachingTaskStatus.Published);
+        var otherCollege = new College { Code = "OTHER", Name = "其他学院" };
+        var otherCourse = new Course
+        {
+            Code = "OTHER101",
+            Name = "范围外课程",
+            College = otherCollege,
+            Nature = CourseNature.MajorRequired,
+            TotalHours = 32,
+            LectureHours = 32
+        };
+        database.Db.Add(new TeachingTask
+        {
+            TaskNumber = "TASK-OUT-OF-SCOPE",
+            Name = "范围外教学任务",
+            AcademicTermId = database.TermId,
+            Course = otherCourse,
+            Capacity = 40,
+            StartWeek = 1,
+            EndWeek = 16,
+            WeeklyHours = 2,
+            Status = TeachingTaskStatus.Published,
+            PublishedAt = DateTime.UtcNow
+        });
+        await database.Db.SaveChangesAsync();
+
+        var result = await database.Controller.GetOptions(
+            database.TermId,
+            TeachingTaskStatus.Published,
+            CancellationToken.None);
+
+        var ok = Assert.IsType<OkObjectResult>(result);
+        var items = Assert.IsAssignableFrom<System.Collections.IEnumerable>(ok.Value);
+        Assert.Single(items.Cast<object>());
+    }
+
     private sealed class TestDatabase : IAsyncDisposable
     {
         private readonly SqliteConnection connection;
@@ -75,7 +137,8 @@ public sealed class TeachingTasksControllerTests
             SqliteConnection connection,
             AppDbContext db,
             AcademicTerm term,
-            Course course)
+            Course course,
+            ICurrentUserDataScope dataScope)
         {
             this.connection = connection;
             Db = db;
@@ -83,13 +146,14 @@ public sealed class TeachingTasksControllerTests
             this.course = course;
             Controller = new TeachingTasksController(
                 db,
-                new TestDataScope());
+                dataScope);
         }
 
         public AppDbContext Db { get; }
         public TeachingTasksController Controller { get; }
+        public Guid TermId => term.Id;
 
-        public static async Task<TestDatabase> CreateAsync()
+        public static async Task<TestDatabase> CreateAsync(bool collegeScoped = false)
         {
             var connection = new SqliteConnection("Data Source=:memory:");
             await connection.OpenAsync();
@@ -120,7 +184,12 @@ public sealed class TeachingTasksControllerTests
             };
             db.AddRange(college, term, course);
             await db.SaveChangesAsync();
-            return new TestDatabase(connection, db, term, course);
+            return new TestDatabase(
+                connection,
+                db,
+                term,
+                course,
+                new TestDataScope(collegeScoped ? college.Id : null));
         }
 
         public async Task<TeachingTask> AddTaskAsync(
@@ -156,11 +225,19 @@ public sealed class TeachingTasksControllerTests
 
     private sealed class TestDataScope : ICurrentUserDataScope
     {
-        public CurrentUserScope Current { get; } = new(
+        public TestDataScope(Guid? restrictedCollegeId = null)
+        {
+            Current = new CurrentUserScope(
                 Guid.NewGuid(),
                 "测试管理员",
-            null,
-            DataScope.All,
-            new HashSet<string>([SystemRoles.SuperAdmin]));
+                restrictedCollegeId,
+                restrictedCollegeId.HasValue ? DataScope.College : DataScope.All,
+                new HashSet<string>(
+                    restrictedCollegeId.HasValue
+                        ? [SystemRoles.CollegeAdmin]
+                        : [SystemRoles.SuperAdmin]));
+        }
+
+        public CurrentUserScope Current { get; }
     }
 }

web/src/components.d.ts

@@ -34,6 +34,7 @@ declare module 'vue' {
     ElProgress: typeof import('element-plus/es')['ElProgress']
     ElRadioButton: typeof import('element-plus/es')['ElRadioButton']
     ElRadioGroup: typeof import('element-plus/es')['ElRadioGroup']
+    ElSegmented: typeof import('element-plus/es')['ElSegmented']
     ElSelect: typeof import('element-plus/es')['ElSelect']
     ElSubMenu: typeof import('element-plus/es')['ElSubMenu']
     ElSwitch: typeof import('element-plus/es')['ElSwitch']

web/src/style.css

@@ -482,11 +482,105 @@ button { cursor: pointer; }
 .selection-ledger-head h3 { margin: 7px 0 4px; font-family: "STZhongsong", "Songti SC", serif; font-size: 19px; }
 .selection-ledger-head p { margin: 0; color: var(--muted); font-size: 10px; }
 .capacity-number { color: var(--indigo); font: 700 13px/1 Consolas, monospace; }
+.selection-timetable-card { min-width: 0; overflow: hidden; }
+.selection-timetable-head,
+.selection-catalog-head {
+  min-height: 92px; padding: 18px 21px; display: flex; align-items: center;
+  justify-content: space-between; gap: 20px; border-bottom: 1px solid var(--line);
+}
+.selection-timetable-head > div,
+.selection-catalog-head > div { min-width: 0; }
+.selection-timetable-head span,
+.selection-catalog-head span {
+  color: var(--teal); font: 700 9px/1 Consolas, monospace; letter-spacing: .14em;
+}
+.selection-timetable-head h3,
+.selection-catalog-head h3 {
+  margin: 7px 0 4px; font-family: "STZhongsong", "Songti SC", serif; font-size: 19px;
+}
+.selection-timetable-head p,
+.selection-catalog-head p { margin: 0; color: var(--muted); font-size: 10px; }
+.selection-preview-alert { margin: 14px 16px 0; width: auto; }
+.selection-timetable-scroll { min-width: 0; overflow-x: auto; background: #f7f9fb; }
+.selection-timetable-grid {
+  min-width: 970px; padding: 0 12px 14px; display: grid;
+  grid-template-columns: 62px repeat(7, minmax(120px, 1fr));
+  position: relative;
+}
+.timetable-corner,
+.timetable-day {
+  display: flex; align-items: center; justify-content: center;
+  border-bottom: 1px solid #cfd8e2; color: #566277; background: #edf2f6;
+  font-size: 10px; font-weight: 700; z-index: 3;
+}
+.timetable-corner { grid-column: 1; grid-row: 1; gap: 4px; color: var(--indigo); }
+.timetable-day { border-left: 1px solid #d8e0e8; }
+.timetable-period {
+  padding-right: 9px; display: flex; align-items: center; justify-content: flex-end; gap: 5px;
+  border-bottom: 1px solid #dfe5eb; color: #657084; background: #f2f5f8; z-index: 1;
+}
+.timetable-period b { color: var(--indigo); font: 700 15px/1 Consolas, monospace; }
+.timetable-period span { font-size: 8px; }
+.timetable-cell {
+  border-left: 1px solid #e0e6ec; border-bottom: 1px solid #e0e6ec;
+  background:
+    linear-gradient(135deg, rgba(37,58,115,.018) 25%, transparent 25%) 0 0 / 8px 8px,
+    white;
+}
+.timetable-course {
+  min-width: 0; padding: 4px; display: flex; flex-direction: column; gap: 3px;
+  z-index: 2; pointer-events: none;
+}
+.timetable-course.multiple { flex-direction: row; }
+.timetable-course article {
+  min-width: 0; min-height: 0; flex: 1; padding: 7px 8px; overflow: hidden;
+  border-left: 3px solid #566fc1; color: #283554; background: #e8edfb;
+  box-shadow: 0 2px 5px rgba(28,44,84,.08);
+}
+.timetable-course article.tone-1 { border-left-color: #2b988b; background: #e3f2ef; }
+.timetable-course article.tone-2 { border-left-color: #c1812c; background: #f8eddc; }
+.timetable-course article.tone-3 { border-left-color: #8a5aa8; background: #f0e8f4; }
+.timetable-course article.tone-4 { border-left-color: #3982a3; background: #e4f0f5; }
+.timetable-course article.preview {
+  outline: 2px dashed #d29135; outline-offset: -2px; background: #fff6df;
+}
+.timetable-course article.conflict {
+  border-left-color: #bd3e49; outline-color: #bd3e49; background: #fde8e9;
+}
+.timetable-course b,
+.timetable-course span,
+.timetable-course small {
+  display: block; overflow: hidden; white-space: nowrap; text-overflow: ellipsis;
+}
+.timetable-course b { font-size: 10px; line-height: 1.3; }
+.timetable-course span { margin-top: 4px; color: #5e6880; font-size: 8px; }
+.timetable-course small { margin-top: 3px; color: #697486; font-size: 8px; }
+.flexible-course-row {
+  padding: 13px 18px; display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
+  border-top: 1px solid var(--line); background: white;
+}
+.flexible-course-row > b { margin-right: 4px; color: #4e596d; font-size: 10px; }
+.flexible-course-row > span {
+  padding: 5px 8px; border: 1px solid #cad7df; color: #48606c; background: #f4f8f9;
+  font-size: 9px;
+}
+.flexible-course-row > span.preview { border-style: dashed; border-color: #d29135; background: #fff6df; }
+.selection-catalog { overflow: hidden; }
+.selection-catalog-head > b {
+  flex: 0 0 auto; color: var(--indigo); font: 700 18px/1 Consolas, monospace;
+}
+.selection-catalog-filter {
+  padding: 13px 16px; display: grid; grid-template-columns: minmax(260px, 1fr) auto;
+  align-items: center; gap: 12px; background: #f8fafb;
+}
+.selection-catalog-filter .el-segmented { --el-segmented-item-selected-bg-color: var(--indigo); }
 .offering-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
 .offering-ticket {
   min-width: 0; min-height: 250px; display: flex; flex-direction: column;
   border: 1px solid var(--line); background: white; box-shadow: 0 6px 18px rgba(24,36,68,.045);
 }
+.offering-ticket.previewing { border-color: #d49a48; box-shadow: 0 0 0 2px rgba(212,154,72,.12); }
+.offering-ticket.blocked:not(.selected) { background: #fbfcfd; }
 .offering-ticket > header {
   min-height: 99px; padding: 19px 20px; display: flex; justify-content: space-between;
   gap: 16px; border-bottom: 1px dashed #d7dce4; position: relative;
@@ -512,11 +606,15 @@ button { cursor: pointer; }
 .ticket-schedules > div { display: flex; align-items: flex-start; gap: 7px; color: #4e596d; font-size: 10px; line-height: 1.5; }
 .ticket-schedules .el-icon { flex: 0 0 auto; margin-top: 1px; color: var(--indigo); }
 .schedule-missing { color: #a36d22; font-size: 10px; }
+.selection-block-reason {
+  margin: 0 20px 12px; padding: 8px 10px; border-left: 3px solid #bd3e49;
+  color: #90343d; background: #fbedee; font-size: 9px; line-height: 1.5;
+}
 .offering-ticket > footer {
   margin-top: auto; min-height: 65px; padding: 13px 20px; display: flex; align-items: center;
-  gap: 18px; background: #fafbfc; border-top: 1px solid #edf0f4;
+  flex-wrap: wrap; gap: 10px; background: #fafbfc; border-top: 1px solid #edf0f4;
 }
-.seat-meter { flex: 1; min-width: 0; }
+.seat-meter { flex: 1; min-width: 120px; }
 .seat-meter > span { display: block; margin-bottom: 7px; color: var(--muted); font-size: 9px; }
 .seat-meter > div { height: 4px; overflow: hidden; background: #e2e6ec; }
 .seat-meter i { height: 100%; display: block; background: var(--teal); }
@@ -1051,6 +1149,8 @@ button { cursor: pointer; }
     border-left: none;
   }
   .round-actions { justify-content: flex-start; }
+  .selection-catalog-filter { grid-template-columns: 1fr; }
+  .selection-catalog-filter .el-segmented { width: 100%; }
   .offering-grid { grid-template-columns: 1fr; }
   .grade-workspace { display: block; }
   .grade-sheet-list { max-height: 300px; overflow-y: auto; border-right: none; border-bottom: 1px solid var(--line); }
@@ -1090,6 +1190,12 @@ button { cursor: pointer; }
   .window-copy em { display: block; margin: 7px 0 0; padding: 0; border: none; }
   .credit-meter, .round-actions { padding: 18px; }
   .selection-ledger-head { align-items: flex-start; flex-direction: column; }
+  .selection-timetable-head,
+  .selection-catalog-head { align-items: flex-start; flex-direction: column; }
+  .selection-timetable-head .el-button { width: 100%; }
+  .selection-timetable-grid { min-width: 820px; }
+  .selection-catalog-filter .el-segmented { overflow-x: auto; }
+  .flexible-course-row { align-items: flex-start; flex-direction: column; }
   .offering-ticket > footer { align-items: stretch; flex-direction: column; }
   .offering-ticket > footer .el-button { width: 100%; }
   .grade-toolbar { flex-wrap: wrap; }

web/src/views/CourseSelectionView.vue

@@ -1,10 +1,12 @@
 <script setup lang="ts">
 import { computed, onMounted, reactive, ref } from 'vue'
 import {
+  Calendar,
   CircleCheck,
   Clock,
   Plus,
   Refresh,
+  Search,
   Tickets,
   UserFilled,
 } from '@element-plus/icons-vue'
@@ -43,6 +45,9 @@ const eligibleLoading = ref(false)
 const proxySubmitting = ref(false)
 const studentKeyword = ref('')
 const selectedStudentIds = ref<string[]>([])
+const offeringKeyword = ref('')
+const offeringStatus = ref('All')
+const previewOfferingId = ref('')
 const roundForm = reactive<Record<string, any>>({})
 const offeringForm = reactive<Record<string, any>>({})
 
@@ -69,6 +74,177 @@ const creditPercent = computed(() => {
 const selectedCount = computed(() =>
   offerings.value.filter((item) => item.enrollmentStatus === 'Enrolled').length,
 )
+const selectedOfferings = computed(() =>
+  offerings.value.filter((item) => item.enrollmentStatus === 'Enrolled'),
+)
+const previewOffering = computed(() =>
+  offerings.value.find((item) => item.id === previewOfferingId.value) ?? null,
+)
+const selectableTasks = computed(() => {
+  const usedTaskIds = new Set(
+    offerings.value
+      .filter((item) => item.id !== editingOfferingId.value)
+      .map((item) => item.teachingTaskId),
+  )
+  return tasks.value.filter((item) => !usedTaskIds.has(item.id))
+})
+
+function includesWeek(schedule: any, week: number) {
+  return schedule.weekPattern === 'All'
+    || schedule.weekPattern === 'Odd' && week % 2 === 1
+    || schedule.weekPattern === 'Even' && week % 2 === 0
+}
+
+function schedulesOverlap(first: any, second: any) {
+  if (first.dayOfWeek !== second.dayOfWeek) return false
+  const periodsOverlap = first.startPeriod < second.startPeriod + second.periodCount
+    && second.startPeriod < first.startPeriod + first.periodCount
+  if (!periodsOverlap) return false
+  const startWeek = Math.max(first.startWeek, second.startWeek)
+  const endWeek = Math.min(first.endWeek, second.endWeek)
+  for (let week = startWeek; week <= endWeek; week += 1) {
+    if (includesWeek(first, week) && includesWeek(second, week)) return true
+  }
+  return false
+}
+
+function conflictingSelectedCourses(offering: any) {
+  if (offering.enrollmentStatus === 'Enrolled' || offering.isFlexible) return []
+  return selectedOfferings.value
+    .filter((selected) =>
+      selected.id !== offering.id
+      && selected.schedules.some((existing: any) =>
+        offering.schedules.some((candidate: any) =>
+          schedulesOverlap(candidate, existing),
+        ),
+      ),
+    )
+    .map((item) => item.courseName)
+}
+
+function offeringBlockReason(offering: any) {
+  if (offering.enrollmentStatus === 'Enrolled') return ''
+  if (!selectedRound.value?.isAvailableNow) return '当前不在选课开放时间内'
+  if (offering.enrolledCount >= offering.capacity) return '教学班名额已满'
+  if (!offering.isFlexible && !offering.schedules.length) return '正式课表尚未发布'
+  if (selectedOfferings.value.some((item) =>
+    item.id !== offering.id && item.courseCode === offering.courseCode,
+  )) return '本学期已选择同一课程'
+  if (selectedCredits.value + Number(offering.credits) > Number(selectedRound.value.maxCredits)) {
+    return `选择后将超过 ${selectedRound.value.maxCredits} 学分上限`
+  }
+  const conflicts = conflictingSelectedCourses(offering)
+  return conflicts.length ? `与已选“${conflicts.join('、')}”时间冲突` : ''
+}
+
+const filteredOfferings = computed(() => {
+  const keyword = offeringKeyword.value.trim().toLocaleLowerCase()
+  return offerings.value.filter((offering) => {
+    const matchesKeyword = !keyword || [
+      offering.courseCode,
+      offering.courseName,
+      offering.taskNumber,
+      ...(offering.teacherNames ?? []),
+    ].some((value) => String(value ?? '').toLocaleLowerCase().includes(keyword))
+    if (!matchesKeyword) return false
+    if (offeringStatus.value === 'Selected') {
+      return offering.enrollmentStatus === 'Enrolled'
+    }
+    const blocked = Boolean(offeringBlockReason(offering))
+    if (offeringStatus.value === 'Selectable') {
+      return offering.enrollmentStatus !== 'Enrolled' && !blocked
+    }
+    if (offeringStatus.value === 'Blocked') {
+      return offering.enrollmentStatus !== 'Enrolled' && blocked
+    }
+    return true
+  })
+})
+
+const timetableOfferings = computed(() => {
+  const result = [...selectedOfferings.value]
+  if (previewOffering.value
+    && previewOffering.value.enrollmentStatus !== 'Enrolled') {
+    result.push(previewOffering.value)
+  }
+  return result
+})
+
+const timetablePeriodCount = computed(() => Math.max(
+  12,
+  ...timetableOfferings.value.flatMap((offering) =>
+    offering.schedules.map((schedule: any) =>
+      schedule.startPeriod + schedule.periodCount - 1,
+    ),
+  ),
+))
+const timetablePeriods = computed(() =>
+  Array.from({ length: timetablePeriodCount.value }, (_, index) => index + 1),
+)
+const timetableCells = computed(() =>
+  timetablePeriods.value.flatMap((period) =>
+    Array.from({ length: 7 }, (_, index) => ({
+      key: `${index + 1}-${period}`,
+      dayOfWeek: index + 1,
+      period,
+    })),
+  ),
+)
+const timetableGroups = computed(() => {
+  const entriesByDay = new Map<number, any[]>()
+  timetableOfferings.value.forEach((offering, offeringIndex) => {
+    offering.schedules.forEach((schedule: any) => {
+      const dayEntries = entriesByDay.get(schedule.dayOfWeek) ?? []
+      dayEntries.push({
+        ...schedule,
+        courseName: offering.courseName,
+        taskNumber: offering.taskNumber,
+        isPreview: offering.id === previewOfferingId.value,
+        hasConflict: offering.id === previewOfferingId.value
+          && conflictingSelectedCourses(offering).length > 0,
+        tone: offeringIndex % 5,
+      })
+      entriesByDay.set(schedule.dayOfWeek, dayEntries)
+    })
+  })
+  const groups: any[] = []
+  entriesByDay.forEach((entries, dayOfWeek) => {
+    entries
+      .sort((first, second) =>
+        first.startPeriod - second.startPeriod
+        || first.periodCount - second.periodCount,
+      )
+      .forEach((entry) => {
+        const endPeriod = entry.startPeriod + entry.periodCount
+        const current = groups.at(-1)
+        if (current
+          && current.dayOfWeek === dayOfWeek
+          && entry.startPeriod < current.endPeriod) {
+          current.endPeriod = Math.max(current.endPeriod, endPeriod)
+          current.periodCount = current.endPeriod - current.startPeriod
+          current.entries.push(entry)
+          return
+        }
+        groups.push({
+          key: `${dayOfWeek}-${entry.startPeriod}-${groups.length}`,
+          dayOfWeek,
+          startPeriod: entry.startPeriod,
+          endPeriod,
+          periodCount: entry.periodCount,
+          entries: [entry],
+        })
+      })
+  })
+  return groups
+})
+const flexibleTimetableOfferings = computed(() =>
+  timetableOfferings.value.filter((offering) => offering.isFlexible),
+)
+const previewConflictNames = computed(() =>
+  previewOffering.value
+    ? conflictingSelectedCourses(previewOffering.value)
+    : [],
+)
 
 function formatDateTime(value: string) {
   if (!value) return '—'
@@ -121,6 +297,7 @@ async function loadRounds(keepSelection = true) {
 
 async function selectRound(round: any) {
   selectedRound.value = round
+  previewOfferingId.value = ''
   detailLoading.value = true
   try {
     if (isStudent.value) {
@@ -146,15 +323,13 @@ async function selectRound(round: any) {
 }
 
 async function loadTasks(academicTermId: string) {
-  const { data } = await http.get('/teaching-tasks', {
+  const { data } = await http.get('/teaching-tasks/options', {
     params: {
       academicTermId,
       status: 'Published',
-      page: 1,
-      pageSize: 100,
     },
   })
-  tasks.value = data.items
+  tasks.value = data
 }
 
 function openRound(round?: any) {
@@ -401,6 +576,12 @@ async function enroll(offering: any) {
   }
 }
 
+function togglePreview(offering: any) {
+  previewOfferingId.value = previewOfferingId.value === offering.id
+    ? ''
+    : offering.id
+}
+
 async function withdraw(offering: any) {
   const enrollment = enrollments.value.find(
     (item) =>
@@ -567,8 +748,148 @@ onMounted(async () => {
         </el-table>
       </section>
 
-      <section v-else class="offering-grid" v-loading="detailLoading">
-        <article v-for="offering in offerings" :key="offering.id" class="offering-ticket">
+      <template v-else>
+        <section class="data-card selection-timetable-card" v-loading="detailLoading">
+          <div class="selection-timetable-head">
+            <div>
+              <span>WEEKLY ARRANGEMENT</span>
+              <h3>已选课程表</h3>
+              <p>
+                {{ selectedCount ? `已排入 ${selectedCount} 门课程` : '选择课程后将在此形成周课表' }}
+                <template v-if="previewOffering">
+                  · 正在试排“{{ previewOffering.courseName }}”
+                </template>
+              </p>
+            </div>
+            <el-button
+              v-if="previewOffering"
+              plain
+              @click="previewOfferingId = ''"
+            >结束试排</el-button>
+          </div>
+          <el-alert
+            v-if="previewConflictNames.length"
+            class="selection-preview-alert"
+            type="error"
+            :closable="false"
+            :title="`试排课程与“${previewConflictNames.join('、')}”时间冲突，不能同时选择。`"
+          />
+          <div class="selection-timetable-scroll">
+            <div
+              class="selection-timetable-grid"
+              :style="{ gridTemplateRows: `42px repeat(${timetablePeriodCount}, 64px)` }"
+            >
+              <div class="timetable-corner">
+                <el-icon><Calendar /></el-icon>
+                节次
+              </div>
+              <div
+                v-for="day in 7"
+                :key="`day-${day}`"
+                class="timetable-day"
+                :style="{ gridColumn: day + 1, gridRow: 1 }"
+              >{{ weekdayLabels[day] }}</div>
+              <div
+                v-for="period in timetablePeriods"
+                :key="`period-${period}`"
+                class="timetable-period"
+                :style="{ gridColumn: 1, gridRow: period + 1 }"
+              >
+                <b>{{ period }}</b>
+                <span>第 {{ period }} 节</span>
+              </div>
+              <div
+                v-for="cell in timetableCells"
+                :key="cell.key"
+                class="timetable-cell"
+                :style="{
+                  gridColumn: cell.dayOfWeek + 1,
+                  gridRow: cell.period + 1,
+                }"
+              />
+              <div
+                v-for="group in timetableGroups"
+                :key="group.key"
+                :class="['timetable-course', { multiple: group.entries.length > 1 }]"
+                :style="{
+                  gridColumn: group.dayOfWeek + 1,
+                  gridRow: `${group.startPeriod + 1} / span ${group.periodCount}`,
+                }"
+              >
+                <article
+                  v-for="entry in group.entries"
+                  :key="`${entry.taskNumber}-${entry.startWeek}-${entry.weekPattern}`"
+                  :class="[
+                    `tone-${entry.tone}`,
+                    { preview: entry.isPreview, conflict: entry.hasConflict },
+                  ]"
+                >
+                  <b>{{ entry.courseName }}</b>
+                  <span>
+                    {{ entry.startWeek }}—{{ entry.endWeek }} 周
+                    {{ patternLabels[entry.weekPattern] === '每周' ? '' : patternLabels[entry.weekPattern] }}
+                  </span>
+                  <small>{{ entry.classroomName }}</small>
+                </article>
+              </div>
+            </div>
+          </div>
+          <div
+            v-if="flexibleTimetableOfferings.length"
+            class="flexible-course-row"
+          >
+            <b>非排时课程</b>
+            <span
+              v-for="offering in flexibleTimetableOfferings"
+              :key="offering.id"
+              :class="{ preview: offering.id === previewOfferingId }"
+            >
+              {{ offering.courseName }} · 不占固定节次与教室
+            </span>
+          </div>
+        </section>
+
+        <section class="data-card selection-catalog">
+          <div class="selection-catalog-head">
+            <div>
+              <span>AVAILABLE CLASSES</span>
+              <h3>本轮可选教学班</h3>
+              <p>先试排再选课；冲突、容量和学分限制会提前显示，提交时服务端会再次校验。</p>
+            </div>
+            <b>{{ filteredOfferings.length }} / {{ offerings.length }}</b>
+          </div>
+          <div class="selection-catalog-filter">
+            <el-input
+              v-model="offeringKeyword"
+              :prefix-icon="Search"
+              clearable
+              placeholder="搜索课程代码、课程名称、教学班或教师"
+            />
+            <el-segmented
+              v-model="offeringStatus"
+              :options="[
+                { label: '全部', value: 'All' },
+                { label: '可选', value: 'Selectable' },
+                { label: '已选', value: 'Selected' },
+                { label: '受限', value: 'Blocked' },
+              ]"
+            />
+          </div>
+        </section>
+
+        <section class="offering-grid" v-loading="detailLoading">
+        <article
+          v-for="offering in filteredOfferings"
+          :key="offering.id"
+          :class="[
+            'offering-ticket',
+            {
+              selected: offering.enrollmentStatus === 'Enrolled',
+              previewing: offering.id === previewOfferingId,
+              blocked: offering.enrollmentStatus !== 'Enrolled' && offeringBlockReason(offering),
+            },
+          ]"
+        >
           <header>
             <div>
               <span>{{ offering.courseCode }} · {{ offering.taskNumber }}</span>
@@ -589,11 +910,23 @@ onMounted(async () => {
             </span>
             <span v-else-if="!offering.schedules.length" class="schedule-missing">课表尚未发布</span>
           </div>
+          <div
+            v-if="offering.enrollmentStatus !== 'Enrolled' && offeringBlockReason(offering)"
+            class="selection-block-reason"
+          >
+            {{ offeringBlockReason(offering) }}
+          </div>
           <footer>
             <div class="seat-meter">
               <span>剩余 {{ Math.max(0, offering.capacity - offering.enrolledCount) }} / {{ offering.capacity }} 席</span>
               <div><i :style="{ width: `${Math.min(100, offering.enrolledCount / offering.capacity * 100)}%` }" /></div>
             </div>
+            <el-button
+              v-if="offering.schedules.length || offering.isFlexible"
+              text
+              :type="offering.id === previewOfferingId ? 'warning' : 'primary'"
+              @click="togglePreview(offering)"
+            >{{ offering.id === previewOfferingId ? '取消试排' : '课表试排' }}</el-button>
             <el-button
               v-if="offering.enrollmentStatus === 'Enrolled'"
               type="danger"
@@ -604,14 +937,18 @@ onMounted(async () => {
             <el-button
               v-else
               type="primary"
-              :disabled="!selectedRound.isAvailableNow || offering.enrolledCount >= offering.capacity || (!offering.isFlexible && !offering.schedules.length)"
+              :disabled="Boolean(offeringBlockReason(offering))"
               @click="enroll(offering)"
             >{{ offering.enrollmentStatus === 'Withdrawn' ? '重新选择' : '选择课程' }}</el-button>
           </footer>
         </article>
-        <el-empty v-if="!offerings.length" description="本轮没有适合你所在班级的课程" />
+        <el-empty
+          v-if="!filteredOfferings.length"
+          :description="offerings.length ? '没有符合当前筛选条件的教学班' : '本轮没有适合你所在班级的课程'"
+        />
         </section>
       </template>
+    </template>
 
     <el-empty v-else-if="!loading" description="暂无选课批次" />
 
@@ -670,9 +1007,9 @@ onMounted(async () => {
             @change="onTaskChanged"
           >
             <el-option
-              v-for="task in tasks"
+              v-for="task in selectableTasks"
               :key="task.id"
-              :label="`${task.taskNumber} · ${task.courseCode} ${task.courseName}`"
+              :label="`${task.taskNumber} · ${task.courseCode} ${task.courseName}${task.schedulingMode === 'Flexible' ? '（非排时）' : ''}`"
               :value="task.id"
             />
           </el-select>