SectionsActive Weeks/setup done.

src/backend/src/main/java/team/projectpulse/section/SectionController.java

@@ -7,6 +7,7 @@
 import org.springframework.web.bind.annotation.*;
 import team.projectpulse.common.Result;
 
+import java.util.List;
 import java.util.Map;
 
 @RestController
@@ -48,4 +49,23 @@ public Result<Map<String, Object>> searchSections(
     public Result<Section> findById(@PathVariable Long id) {
         return Result.success(sectionService.findById(id));
     }
+
+    /**
+     * UC-6: Get all computed weeks for a section (Monday–Sunday ranges).
+     * GET /api/v1/sections/{id}/weeks
+     */
+    @GetMapping("/{id}/weeks")
+    public Result<List<SectionWeekInfo>> getWeeks(@PathVariable Long id) {
+        return Result.success(sectionService.getWeeks(id));
+    }
+
+    /**
+     * UC-6: Save the admin's chosen active weeks for a section.
+     * POST /api/v1/sections/{id}/weeks
+     */
+    @PostMapping("/{id}/weeks")
+    public Result<Void> setUpActiveWeeks(@PathVariable Long id, @RequestBody List<String> activeWeeks) {
+        sectionService.setUpActiveWeeks(id, activeWeeks);
+        return Result.success("Active weeks updated.", null);
+    }
 }

src/backend/src/main/java/team/projectpulse/section/SectionService.java

@@ -3,6 +3,15 @@
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.DayOfWeek;
+import java.time.LocalDate;
+import java.time.temporal.TemporalAdjusters;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
 
 @Service
 public class SectionService {
@@ -23,4 +32,40 @@ public Section findById(Long id) {
         return sectionRepository.findById(id)
                 .orElseThrow(() -> new SectionNotFoundException(id));
     }
+
+    /**
+     * UC-6: Compute all Monday–Sunday weeks between section start/end dates,
+     * marking each as active if its week number appears in section.activeWeeks.
+     */
+    public List<SectionWeekInfo> getWeeks(Long sectionId) {
+        Section section = findById(sectionId);
+        if (section.getStartDate() == null || section.getEndDate() == null) {
+            return List.of();
+        }
+        Set<String> activeSet = new HashSet<>(
+                section.getActiveWeeks() != null ? section.getActiveWeeks() : List.of()
+        );
+        List<SectionWeekInfo> weeks = new ArrayList<>();
+        LocalDate weekStart = section.getStartDate()
+                .with(TemporalAdjusters.previousOrSame(DayOfWeek.MONDAY));
+        int num = 1;
+        while (!weekStart.isAfter(section.getEndDate())) {
+            LocalDate weekEnd = weekStart.with(DayOfWeek.SUNDAY);
+            String n = String.valueOf(num);
+            weeks.add(new SectionWeekInfo(n, weekStart.toString(), weekEnd.toString(), activeSet.contains(n)));
+            weekStart = weekStart.plusWeeks(1);
+            num++;
+        }
+        return weeks;
+    }
+
+    /**
+     * UC-6: Replace the section's active weeks with the provided list.
+     */
+    @Transactional
+    public void setUpActiveWeeks(Long sectionId, List<String> activeWeeks) {
+        Section section = findById(sectionId);
+        section.setActiveWeeks(activeWeeks != null ? activeWeeks : List.of());
+        sectionRepository.save(section);
+    }
 }

src/backend/src/main/java/team/projectpulse/section/SectionWeekInfo.java

@@ -0,0 +1,4 @@
+package team.projectpulse.section;
+
+public record SectionWeekInfo(String weekNumber, String monday, String sunday, boolean isActive) {
+}

src/frontend/src/apis/section/index.ts

@@ -2,8 +2,8 @@ import request from '@/utils/request'
 import type {
   PaginationParams, Section, SectionSearchCriteria,
   CreateSectionResponse, FindSectionByIdResponse, SearchSectionByCriteriaResponse,
-  UpdateSectionResponse, AssignRubricToSectionResponse, SetUpActiveWeeksResponse,
-  SendEmailInvitationsResponse, InviteOrAddInstructorsResponse,
+  UpdateSectionResponse, AssignRubricToSectionResponse, GetSectionWeeksResponse,
+  SetUpActiveWeeksResponse, SendEmailInvitationsResponse, InviteOrAddInstructorsResponse,
   GetInstructorsResponse, RemoveInstructorResponse
 } from './types'
 
@@ -16,6 +16,8 @@ export const createSection = (section: Section) => request.post<any, CreateSecti
 export const updateSection = (section: Section) => request.put<any, UpdateSectionResponse>(`${API.SECTIONS}/${section.sectionId}`, section)
 export const assignRubricToSection = (sectionId: number, rubricId: number) =>
   request.put<any, AssignRubricToSectionResponse>(`${API.SECTIONS}/${sectionId}/rubrics/${rubricId}`)
+export const getSectionWeeks = (sectionId: number) =>
+  request.get<any, GetSectionWeeksResponse>(`${API.SECTIONS}/${sectionId}/weeks`)
 export const setUpActiveWeeks = (sectionId: number, activeWeeks: string[]) =>
   request.post<any, SetUpActiveWeeksResponse>(`${API.SECTIONS}/${sectionId}/weeks`, activeWeeks)
 export const sendEmailInvitationsToStudents = (courseId: number, sectionId: number, emails: string[]) =>

src/frontend/src/apis/section/types.ts

@@ -23,6 +23,7 @@ export interface FindSectionByIdResponse { flag: boolean; code: number; message:
 export interface CreateSectionResponse { flag: boolean; code: number; message: string; data: Section }
 export interface UpdateSectionResponse { flag: boolean; code: number; message: string; data: Section }
 export interface AssignRubricToSectionResponse { flag: boolean; code: number; message: string }
+export interface GetSectionWeeksResponse { flag: boolean; code: number; message: string; data: WeekInfo[] }
 export interface SetUpActiveWeeksResponse { flag: boolean; code: number; message: string }
 export interface SendEmailInvitationsResponse { flag: boolean; code: number; message: string }
 export interface InviteOrAddInstructorsResponse {

src/frontend/src/pages/sections/SectionDetail.vue

@@ -130,9 +130,21 @@
         <!-- Active Weeks -->
         <v-col cols="12" md="6">
           <v-card rounded="lg">
-            <v-card-title class="d-flex align-center gap-2 pb-2">
-              <v-icon icon="mdi-calendar-check" color="success" size="20" />
-              Active Weeks
+            <v-card-title class="d-flex align-center justify-space-between pb-2">
+              <div class="d-flex align-center gap-2">
+                <v-icon icon="mdi-calendar-check" color="success" size="20" />
+                Active Weeks
+              </div>
+              <v-btn
+                v-if="userInfoStore.isAdmin"
+                size="small"
+                color="primary"
+                variant="tonal"
+                prepend-icon="mdi-pencil"
+                @click="openWeeksDialog"
+              >
+                Set Up
+              </v-btn>
             </v-card-title>
             <v-divider />
             <v-card-text>
@@ -180,13 +192,78 @@
       Section not found or failed to load.
     </v-alert>
   </div>
+
+  <!-- UC-6: Set Up Active Weeks Dialog -->
+  <v-dialog v-model="weeksDialog" max-width="640" persistent scrollable>
+    <v-card rounded="lg">
+      <v-card-title class="pa-4 d-flex align-center gap-2">
+        <v-icon icon="mdi-calendar-check" color="success" />
+        Set Up Active Weeks
+      </v-card-title>
+      <v-divider />
+
+      <v-card-text style="max-height: 480px;">
+        <div v-if="loadingWeeks" class="d-flex justify-center py-8">
+          <v-progress-circular indeterminate color="primary" />
+        </div>
+        <div v-else-if="!allWeeks.length" class="text-medium-emphasis text-body-2 py-4 text-center">
+          No weeks available. Ensure the section has start and end dates configured.
+        </div>
+        <v-table v-else density="compact">
+          <thead>
+            <tr>
+              <th style="width:40px">
+                <v-checkbox
+                  :model-value="allSelected"
+                  :indeterminate="someSelected && !allSelected"
+                  hide-details
+                  density="compact"
+                  @update:model-value="toggleAll"
+                />
+              </th>
+              <th>Week</th>
+              <th>Monday</th>
+              <th>Sunday</th>
+            </tr>
+          </thead>
+          <tbody>
+            <tr v-for="week in allWeeks" :key="week.weekNumber">
+              <td>
+                <v-checkbox
+                  :model-value="selectedWeeks.has(week.weekNumber)"
+                  hide-details
+                  density="compact"
+                  @update:model-value="toggleWeek(week.weekNumber)"
+                />
+              </td>
+              <td class="font-weight-medium">Week {{ week.weekNumber }}</td>
+              <td class="text-medium-emphasis">{{ week.monday }}</td>
+              <td class="text-medium-emphasis">{{ week.sunday }}</td>
+            </tr>
+          </tbody>
+        </v-table>
+      </v-card-text>
+
+      <v-divider />
+      <v-card-actions class="pa-4">
+        <span class="text-caption text-medium-emphasis">
+          {{ selectedWeeks.size }} of {{ allWeeks.length }} weeks selected
+        </span>
+        <v-spacer />
+        <v-btn variant="text" @click="weeksDialog = false">Cancel</v-btn>
+        <v-btn color="primary" variant="flat" :loading="savingWeeks" @click="saveWeeks">
+          Save
+        </v-btn>
+      </v-card-actions>
+    </v-card>
+  </v-dialog>
 </template>
 
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useRoute } from 'vue-router'
-import { findSectionById } from '@/apis/section'
-import type { Section } from '@/apis/section/types'
+import { findSectionById, getSectionWeeks, setUpActiveWeeks } from '@/apis/section'
+import type { Section, WeekInfo } from '@/apis/section/types'
 import { useUserInfoStore } from '@/stores/userInfo'
 import { useNotifyStore } from '@/stores/notify'
 
@@ -197,6 +274,16 @@ const notifyStore = useNotifyStore()
 const section = ref<Section | null>(null)
 const loading = ref(false)
 
+// UC-6: active weeks dialog state
+const weeksDialog = ref(false)
+const loadingWeeks = ref(false)
+const savingWeeks = ref(false)
+const allWeeks = ref<WeekInfo[]>([])
+const selectedWeeks = ref(new Set<string>())
+
+const allSelected = computed(() => allWeeks.value.length > 0 && selectedWeeks.value.size === allWeeks.value.length)
+const someSelected = computed(() => selectedWeeks.value.size > 0)
+
 async function loadSection() {
   loading.value = true
   try {
@@ -210,5 +297,52 @@ async function loadSection() {
   }
 }
 
+async function openWeeksDialog() {
+  weeksDialog.value = true
+  loadingWeeks.value = true
+  try {
+    const id = Number(route.params.sectionId)
+    const res = await getSectionWeeks(id)
+    allWeeks.value = res.data
+    selectedWeeks.value = new Set(res.data.filter(w => w.isActive).map(w => w.weekNumber))
+  } catch {
+    // handled by request interceptor
+  } finally {
+    loadingWeeks.value = false
+  }
+}
+
+function toggleWeek(weekNumber: string) {
+  if (selectedWeeks.value.has(weekNumber)) {
+    selectedWeeks.value.delete(weekNumber)
+  } else {
+    selectedWeeks.value.add(weekNumber)
+  }
+  selectedWeeks.value = new Set(selectedWeeks.value)
+}
+
+function toggleAll(val: boolean | null) {
+  if (val) {
+    selectedWeeks.value = new Set(allWeeks.value.map(w => w.weekNumber))
+  } else {
+    selectedWeeks.value = new Set()
+  }
+}
+
+async function saveWeeks() {
+  savingWeeks.value = true
+  try {
+    const id = Number(route.params.sectionId)
+    await setUpActiveWeeks(id, Array.from(selectedWeeks.value))
+    notifyStore.success('Active weeks saved.')
+    weeksDialog.value = false
+    await loadSection()
+  } catch {
+    // handled by request interceptor
+  } finally {
+    savingWeeks.value = false
+  }
+}
+
 onMounted(loadSection)
 </script>