Merge branch 'feature/even-scheduler'

README.md

@@ -38,7 +38,10 @@ When creating a schedule, the user selects:
 * The start date
 * The target completion date
 
-Attainly then distributes the selected elements evenly across the available days.
+Attainly then distributes the selected elements evenly across the available
+days. When an uneven schedule has more than one assignment per day, the user
+can place the consecutive heavier days at the start, middle, or end of the
+schedule.
 
 For example, a user could choose to schedule:
 

backend/app/Http/Controllers/ScheduleController.php

@@ -44,6 +44,9 @@ class ScheduleController extends Controller
                     levelId: $input->integer('levelId'),
                     startDate: $input->string('startDate'),
                     targetDate: $input->string('targetDate'),
+                    workloadPlacement: $input->string(
+                        'workloadPlacement',
+                    ),
                 ),
             );
         } catch (BadRequestException $exception) {

backend/app/Schedule/EvenDistributionScheduler.php

@@ -0,0 +1,114 @@
+<?php
+
+namespace App\Schedule;
+
+use DateTimeImmutable;
+
+class EvenDistributionScheduler
+{
+    /**
+     * @return list<DateTimeImmutable>
+     */
+    public function scheduledDates(
+        int $assignmentCount,
+        DateTimeImmutable $startDate,
+        DateTimeImmutable $targetDate,
+        WorkloadPlacement $workloadPlacement,
+    ): array {
+        $differenceInDays = $startDate->diff($targetDate)->days;
+        $dayCount = $differenceInDays + 1;
+
+        if ($assignmentCount < $dayCount) {
+            return $this->sparseDates(
+                assignmentCount: $assignmentCount,
+                dayCount: $dayCount,
+                startDate: $startDate,
+            );
+        }
+
+        return $this->dailyDates(
+            assignmentCount: $assignmentCount,
+            dayCount: $dayCount,
+            startDate: $startDate,
+            workloadPlacement: $workloadPlacement,
+        );
+    }
+
+    /**
+     * @return list<DateTimeImmutable>
+     */
+    private function sparseDates(
+        int $assignmentCount,
+        int $dayCount,
+        DateTimeImmutable $startDate,
+    ): array {
+        if ($assignmentCount === 1) {
+            return [$startDate];
+        }
+
+        $dates = [];
+        for ($assignmentIndex = 0;
+            $assignmentIndex < $assignmentCount;
+            $assignmentIndex++
+        ) {
+            $scaledIndex = $assignmentIndex * ($dayCount - 1)
+                / ($assignmentCount - 1);
+            $dayIndex = (int) floor($scaledIndex + 0.5);
+            $dates[] = $startDate->modify("+{$dayIndex} days");
+        }
+
+        return $dates;
+    }
+
+    /**
+     * @return list<DateTimeImmutable>
+     */
+    private function dailyDates(
+        int $assignmentCount,
+        int $dayCount,
+        DateTimeImmutable $startDate,
+        WorkloadPlacement $workloadPlacement,
+    ): array {
+        $assignmentsPerDay = intdiv($assignmentCount, $dayCount);
+        $heavierDayCount = $assignmentCount % $dayCount;
+        $heavierBlockStart = $this->heavierBlockStart(
+            dayCount: $dayCount,
+            heavierDayCount: $heavierDayCount,
+            workloadPlacement: $workloadPlacement,
+        );
+        $dates = [];
+
+        for ($dayIndex = 0; $dayIndex < $dayCount; $dayIndex++) {
+            $assignmentCountForDay = $assignmentsPerDay;
+            if (
+                $dayIndex >= $heavierBlockStart
+                && $dayIndex < $heavierBlockStart + $heavierDayCount
+            ) {
+                $assignmentCountForDay++;
+            }
+
+            $date = $startDate->modify("+{$dayIndex} days");
+            for ($index = 0; $index < $assignmentCountForDay; $index++) {
+                $dates[] = $date;
+            }
+        }
+
+        return $dates;
+    }
+
+    private function heavierBlockStart(
+        int $dayCount,
+        int $heavierDayCount,
+        WorkloadPlacement $workloadPlacement,
+    ): int {
+        if ($workloadPlacement === WorkloadPlacement::Start) {
+            return 0;
+        }
+
+        if ($workloadPlacement === WorkloadPlacement::End) {
+            return $dayCount - $heavierDayCount;
+        }
+
+        return intdiv($dayCount - $heavierDayCount, 2);
+    }
+}

backend/app/Schedule/UseCases/CreateSchedule/CreateSchedule.php

@@ -8,8 +8,10 @@ use App\Exceptions\BadRequestException;
 use App\Exceptions\NotFoundException;
 use App\Schedule\CreateScheduleAssignmentDto;
 use App\Schedule\CreateScheduleDto;
+use App\Schedule\EvenDistributionScheduler;
 use App\Schedule\Schedule;
 use App\Schedule\ScheduleRepository;
+use App\Schedule\WorkloadPlacement;
 use App\Set\Set;
 use App\Set\SetLevelRepository;
 use App\Set\SetRepository;
@@ -23,6 +25,7 @@ class CreateSchedule
         private SetLevelRepository $setLevelRepository,
         private ElementRepository $elementRepository,
         private ScheduleRepository $scheduleRepository,
+        private EvenDistributionScheduler $evenDistributionScheduler,
     ) {}
 
     /**
@@ -61,6 +64,9 @@ class CreateSchedule
                 'targetDate must not be before startDate',
             );
         }
+        $workloadPlacement = $this->workloadPlacement(
+            $request->workloadPlacement,
+        );
 
         $elements = array_values(array_filter(
             $this->orderedElements($set),
@@ -72,10 +78,15 @@ class CreateSchedule
             throw new BadRequestException('level has no elements');
         }
 
-        $assignments = $this->assignments(
-            elements: $elements,
+        $scheduledDates = $this->evenDistributionScheduler->scheduledDates(
+            assignmentCount: count($elements),
             startDate: $startDate,
             targetDate: $targetDate,
+            workloadPlacement: $workloadPlacement,
+        );
+        $assignments = $this->assignments(
+            elements: $elements,
+            scheduledDates: $scheduledDates,
         );
 
         return $this->scheduleRepository->create(new CreateScheduleDto(
@@ -144,29 +155,21 @@ class CreateSchedule
 
     /**
      * @param list<Element> $elements
+     * @param list<DateTimeImmutable> $scheduledDates
      * @return list<CreateScheduleAssignmentDto>
      */
     private function assignments(
         array $elements,
-        DateTimeImmutable $startDate,
-        DateTimeImmutable $targetDate,
+        array $scheduledDates,
     ): array {
-        $differenceInDays = $startDate->diff($targetDate)->days;
-        $dayCount = $differenceInDays + 1;
-        $elementCount = count($elements);
         $assignments = [];
 
         foreach ($elements as $index => $element) {
-            $dayIndex = $this->dayIndex(
-                elementIndex: $index,
-                elementCount: $elementCount,
-                dayCount: $dayCount,
-            );
             $assignments[] = new CreateScheduleAssignmentDto(
                 name: $element->getName(),
                 kind: $element->getKind(),
                 path: $this->elementPath($element),
-                scheduledDate: $startDate->modify("+{$dayIndex} days"),
+                scheduledDate: $scheduledDates[$index],
                 position: $index + 1,
             );
         }
@@ -190,25 +193,6 @@ class CreateSchedule
         return $path;
     }
 
-    private function dayIndex(
-        int $elementIndex,
-        int $elementCount,
-        int $dayCount,
-    ): int {
-        if ($elementCount === 1 || $dayCount === 1) {
-            return 0;
-        }
-
-        if ($elementCount < $dayCount) {
-            $scaledIndex = $elementIndex * ($dayCount - 1)
-                / ($elementCount - 1);
-
-            return (int) floor($scaledIndex + 0.5);
-        }
-
-        return intdiv($elementIndex * $dayCount, $elementCount);
-    }
-
     /**
      * @throws BadRequestException
      */
@@ -237,4 +221,23 @@ class CreateSchedule
 
         return $date;
     }
+
+    /**
+     * @throws BadRequestException
+     */
+    private function workloadPlacement(?string $value): WorkloadPlacement
+    {
+        if ($value === null) {
+            return WorkloadPlacement::Middle;
+        }
+
+        $workloadPlacement = WorkloadPlacement::tryFrom($value);
+        if ($workloadPlacement === null) {
+            throw new BadRequestException(
+                'workloadPlacement must be start, middle, or end',
+            );
+        }
+
+        return $workloadPlacement;
+    }
 }

backend/app/Schedule/UseCases/CreateSchedule/CreateScheduleRequest.php

@@ -12,5 +12,6 @@ final readonly class CreateScheduleRequest
         public ?int $levelId,
         public ?string $startDate,
         public ?string $targetDate,
+        public ?string $workloadPlacement,
     ) {}
 }

backend/app/Schedule/WorkloadPlacement.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace App\Schedule;
+
+enum WorkloadPlacement: string
+{
+    case Start = 'start';
+    case Middle = 'middle';
+    case End = 'end';
+}

backend/tests/Feature/Schedule/ScheduleEndpointTest.php

@@ -160,6 +160,65 @@ class ScheduleEndpointTest extends TestCase
             ->assertExactJson($response->json());
     }
 
+    public function test_it_places_heavier_days_at_the_requested_end(): void
+    {
+        $user = $this->createUser('reader@example.com');
+        $set = $this->createSet($user, 'Course');
+        $lessonLevel = $this->createLevel($set, 'lesson');
+        $repository = app(ElementRepository::class);
+
+        foreach (range(1, 11) as $number) {
+            $repository->create(new CreateElementDto(
+                name: "Lesson {$number}",
+                level: $lessonLevel,
+                parentElement: null,
+            ));
+        }
+        $this->createSession($user, 'valid-token');
+
+        $response = $this->credentialedPost('/api/schedules', [
+            'setId' => $set->getId(),
+            'levelId' => $lessonLevel->getId(),
+            'startDate' => '2026-08-10',
+            'targetDate' => '2026-08-14',
+            'workloadPlacement' => 'end',
+        ])->assertCreated();
+
+        $days = $response->json('schedule.days');
+        $this->assertIsArray($days);
+        $this->assertSame(
+            [2, 2, 2, 2, 3],
+            array_map(function (array $day): int {
+                return count($day['assignments']);
+            }, $days),
+        );
+        $this->assertDatabaseCount('schedule_assignments', 11);
+        $this->assertDatabaseCount('schedules', 1);
+    }
+
+    public function test_it_rejects_an_unknown_workload_placement(): void
+    {
+        $user = $this->createUser('reader@example.com');
+        $set = $this->createSet($user, 'Course');
+        $lessonLevel = $this->createLevel($set, 'lesson');
+        app(ElementRepository::class)->create(new CreateElementDto(
+            name: 'Lesson 1',
+            level: $lessonLevel,
+            parentElement: null,
+        ));
+        $this->createSession($user, 'valid-token');
+
+        $this->credentialedPost('/api/schedules', [
+            'setId' => $set->getId(),
+            'levelId' => $lessonLevel->getId(),
+            'startDate' => '2026-08-10',
+            'targetDate' => '2026-08-14',
+            'workloadPlacement' => 'sideways',
+        ])->assertBadRequest()->assertExactJson([
+            'error' => 'workloadPlacement must be start, middle, or end',
+        ]);
+    }
+
     public function test_it_lists_only_the_users_schedules_newest_first(): void
     {
         $user = $this->createUser('reader@example.com');

backend/tests/Unit/Schedule/EvenDistributionSchedulerTest.php

@@ -0,0 +1,129 @@
+<?php
+
+namespace Tests\Unit\Schedule;
+
+use App\Schedule\EvenDistributionScheduler;
+use App\Schedule\WorkloadPlacement;
+use DateTimeImmutable;
+use DateTimeZone;
+use PHPUnit\Framework\TestCase;
+
+class EvenDistributionSchedulerTest extends TestCase
+{
+    public function test_it_places_one_heavier_day_at_the_requested_position(): void
+    {
+        $scheduler = new EvenDistributionScheduler;
+        $expectedCounts = [
+            WorkloadPlacement::Start->value => [3, 2, 2, 2, 2],
+            WorkloadPlacement::Middle->value => [2, 2, 3, 2, 2],
+            WorkloadPlacement::End->value => [2, 2, 2, 2, 3],
+        ];
+
+        foreach (WorkloadPlacement::cases() as $placement) {
+            $dates = $scheduler->scheduledDates(
+                assignmentCount: 11,
+                startDate: $this->utc('2026-08-10'),
+                targetDate: $this->utc('2026-08-14'),
+                workloadPlacement: $placement,
+            );
+
+            $this->assertSame(
+                $expectedCounts[$placement->value],
+                $this->dailyCounts($dates),
+            );
+        }
+    }
+
+    public function test_it_keeps_multiple_heavier_days_together(): void
+    {
+        $scheduler = new EvenDistributionScheduler;
+        $expectedCounts = [
+            WorkloadPlacement::Start->value => [3, 3, 2, 2, 2],
+            WorkloadPlacement::Middle->value => [2, 3, 3, 2, 2],
+            WorkloadPlacement::End->value => [2, 2, 2, 3, 3],
+        ];
+
+        foreach (WorkloadPlacement::cases() as $placement) {
+            $dates = $scheduler->scheduledDates(
+                assignmentCount: 12,
+                startDate: $this->utc('2026-08-10'),
+                targetDate: $this->utc('2026-08-14'),
+                workloadPlacement: $placement,
+            );
+
+            $this->assertSame(
+                $expectedCounts[$placement->value],
+                $this->dailyCounts($dates),
+            );
+        }
+    }
+
+    public function test_it_preserves_sparse_distribution_across_the_full_range(): void
+    {
+        $dates = (new EvenDistributionScheduler)->scheduledDates(
+            assignmentCount: 3,
+            startDate: $this->utc('2026-08-10'),
+            targetDate: $this->utc('2026-08-16'),
+            workloadPlacement: WorkloadPlacement::Middle,
+        );
+
+        $this->assertSame(
+            ['2026-08-10', '2026-08-13', '2026-08-16'],
+            $this->formattedDates($dates),
+        );
+    }
+
+    public function test_it_distributes_even_and_single_day_schedules(): void
+    {
+        $scheduler = new EvenDistributionScheduler;
+
+        $evenDates = $scheduler->scheduledDates(
+            assignmentCount: 10,
+            startDate: $this->utc('2026-08-10'),
+            targetDate: $this->utc('2026-08-14'),
+            workloadPlacement: WorkloadPlacement::End,
+        );
+        $singleDayDates = $scheduler->scheduledDates(
+            assignmentCount: 4,
+            startDate: $this->utc('2026-08-10'),
+            targetDate: $this->utc('2026-08-10'),
+            workloadPlacement: WorkloadPlacement::Middle,
+        );
+
+        $this->assertSame([2, 2, 2, 2, 2], $this->dailyCounts($evenDates));
+        $this->assertSame(
+            [
+                '2026-08-10',
+                '2026-08-10',
+                '2026-08-10',
+                '2026-08-10',
+            ],
+            $this->formattedDates($singleDayDates),
+        );
+    }
+
+    /**
+     * @param list<DateTimeImmutable> $dates
+     * @return list<int>
+     */
+    private function dailyCounts(array $dates): array
+    {
+        return array_values(array_count_values($this->formattedDates($dates)));
+    }
+
+    /**
+     * @param list<DateTimeImmutable> $dates
+     * @return list<string>
+     */
+    private function formattedDates(array $dates): array
+    {
+        return array_map(function (DateTimeImmutable $date): string {
+            return $date->format('Y-m-d');
+        }, $dates);
+    }
+
+    private function utc(string $date): DateTimeImmutable
+    {
+        return new DateTimeImmutable($date, new DateTimeZone('UTC'));
+    }
+}

backend/tests/Unit/Schedule/UseCases/CreateScheduleTest.php

@@ -5,6 +5,7 @@ namespace Tests\Unit\Schedule\UseCases;
 use App\Element\CreateElementDto;
 use App\Exceptions\BadRequestException;
 use App\Exceptions\NotFoundException;
+use App\Schedule\EvenDistributionScheduler;
 use App\Schedule\UseCases\CreateSchedule\CreateSchedule;
 use App\Schedule\UseCases\CreateSchedule\CreateScheduleRequest;
 use App\Set\CreateSetDto;
@@ -108,12 +109,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             $elementRepository,
             $scheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $chapterLevel->getId(),
             startDate: '2026-08-10',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
 
         $this->assertSame('chapter', $schedule->getElementKind());
@@ -182,12 +185,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             $elementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $lessonLevel->getId(),
             startDate: '2026-08-10',
             targetDate: '2026-08-16',
+            workloadPlacement: 'middle',
         ));
 
         $this->assertSame(
@@ -224,12 +229,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             $elementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $milestoneLevel->getId(),
             startDate: '2020-01-01',
             targetDate: '2030-01-01',
+            workloadPlacement: 'middle',
         ));
 
         $this->assertSame(
@@ -240,6 +247,102 @@ class CreateScheduleTest extends TestCase
         );
     }
 
+    public function test_it_defaults_heavier_days_to_the_middle(): void
+    {
+        $user = $this->user();
+        $setRepository = new FakeSetRepository;
+        $setLevelRepository = new FakeSetLevelRepository;
+        $elementRepository = new FakeElementRepository;
+        $set = $setRepository->create(new CreateSetDto(
+            name: 'Course',
+            creator: $user,
+        ));
+        $lessonLevel = $this->createLevel(
+            $setLevelRepository,
+            $set,
+            'lesson',
+        );
+
+        foreach (range(1, 6) as $number) {
+            $elementRepository->create(new CreateElementDto(
+                name: "Lesson {$number}",
+                level: $lessonLevel,
+                parentElement: null,
+            ));
+        }
+
+        $schedule = (new CreateSchedule(
+            $setRepository,
+            $setLevelRepository,
+            $elementRepository,
+            new FakeScheduleRepository,
+            new EvenDistributionScheduler,
+        ))->execute(new CreateScheduleRequest(
+            user: $user,
+            setId: $set->getId(),
+            levelId: $lessonLevel->getId(),
+            startDate: '2026-08-10',
+            targetDate: '2026-08-13',
+            workloadPlacement: null,
+        ));
+
+        $this->assertSame(
+            [
+                '2026-08-10',
+                '2026-08-11',
+                '2026-08-11',
+                '2026-08-12',
+                '2026-08-12',
+                '2026-08-13',
+            ],
+            array_map(function ($assignment): string {
+                return $assignment->getScheduledDate()->format('Y-m-d');
+            }, $schedule->getAssignments()),
+        );
+    }
+
+    public function test_it_rejects_an_unknown_workload_placement(): void
+    {
+        $user = $this->user();
+        $setRepository = new FakeSetRepository;
+        $setLevelRepository = new FakeSetLevelRepository;
+        $elementRepository = new FakeElementRepository;
+        $set = $setRepository->create(new CreateSetDto(
+            name: 'Course',
+            creator: $user,
+        ));
+        $lessonLevel = $this->createLevel(
+            $setLevelRepository,
+            $set,
+            'lesson',
+        );
+        $elementRepository->create(new CreateElementDto(
+            name: 'Lesson 1',
+            level: $lessonLevel,
+            parentElement: null,
+        ));
+
+        $this->expectException(BadRequestException::class);
+        $this->expectExceptionMessage(
+            'workloadPlacement must be start, middle, or end',
+        );
+
+        (new CreateSchedule(
+            $setRepository,
+            $setLevelRepository,
+            $elementRepository,
+            new FakeScheduleRepository,
+            new EvenDistributionScheduler,
+        ))->execute(new CreateScheduleRequest(
+            user: $user,
+            setId: $set->getId(),
+            levelId: $lessonLevel->getId(),
+            startDate: '2026-08-10',
+            targetDate: '2026-08-13',
+            workloadPlacement: 'sideways',
+        ));
+    }
+
     public function test_it_rejects_an_unknown_set(): void
     {
         $this->expectException(NotFoundException::class);
@@ -250,12 +353,14 @@ class CreateScheduleTest extends TestCase
             new FakeSetLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $this->user(),
             setId: 999,
             levelId: 1,
             startDate: '2026-08-10',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
     }
 
@@ -276,12 +381,14 @@ class CreateScheduleTest extends TestCase
             new FakeSetLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: null,
             startDate: '2026-08-10',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
     }
 
@@ -312,12 +419,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $bible->getId(),
             levelId: $moduleLevel->getId(),
             startDate: '2026-08-10',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
     }
 
@@ -344,12 +453,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $chapterLevel->getId(),
             startDate: '2026-08-10',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
     }
 
@@ -376,12 +487,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $chapterLevel->getId(),
             startDate: '2026-02-30',
             targetDate: '2026-08-12',
+            workloadPlacement: 'middle',
         ));
     }
 
@@ -410,12 +523,14 @@ class CreateScheduleTest extends TestCase
             $setLevelRepository,
             new FakeElementRepository,
             new FakeScheduleRepository,
+            new EvenDistributionScheduler,
         ))->execute(new CreateScheduleRequest(
             user: $user,
             setId: $set->getId(),
             levelId: $chapterLevel->getId(),
             startDate: '2026-08-12',
             targetDate: '2026-08-10',
+            workloadPlacement: 'middle',
         ));
     }
 

frontend/website/cypress/e2e/set-scheduling.cy.ts

@@ -60,6 +60,13 @@ const bibleLayout = {
   ],
 }
 
+const overloadedBibleLayout = {
+  ...bibleLayout,
+  levels: bibleLayout.levels.map((level) =>
+    level.id === 3 ? { ...level, elementCount: 11 } : level,
+  ),
+}
+
 const scheduleDetail = {
   schedule: {
     id: 73,
@@ -194,6 +201,7 @@ describe('set scheduling', () => {
         levelId: 3,
         startDate: '2026-08-10',
         targetDate: '2026-08-12',
+        workloadPlacement: 'middle',
       })
       request.reply({ statusCode: 201, body: scheduleDetail })
     }).as('createSchedule')
@@ -244,6 +252,40 @@ describe('set scheduling', () => {
     )
   })
 
+  it('places heavier days where the user chooses', () => {
+    cy.intercept('GET', '**/api/sets/41', {
+      statusCode: 200,
+      body: overloadedBibleLayout,
+    }).as('layout')
+    cy.intercept('POST', '**/api/schedules', (request) => {
+      expect(request.body).to.deep.equal({
+        setId: 41,
+        levelId: 3,
+        startDate: '2026-08-10',
+        targetDate: '2026-08-14',
+        workloadPlacement: 'end',
+      })
+      request.reply({ statusCode: 201, body: scheduleDetail })
+    }).as('createSchedule')
+
+    cy.visit('/sets/41/schedules/new')
+    cy.wait('@me')
+    cy.wait('@layout')
+    cy.get('[data-workload-placement]').should('not.exist')
+
+    cy.get('#schedule-level').select('3')
+    cy.get('#schedule-start-date').type('2026-08-10')
+    cy.get('#schedule-target-date').type('2026-08-14')
+
+    cy.get('[data-workload-placement]').should('be.visible').within(() => {
+      cy.contains('legend', 'Heavier days').should('be.visible')
+      cy.get('input[value="middle"]').should('be.checked')
+      cy.get('input[value="end"]').check()
+    })
+    cy.get('form').submit()
+    cy.wait('@createSchedule')
+  })
+
   it('validates the schedule form before submitting', () => {
     cy.intercept('GET', '**/api/sets/41', {
       statusCode: 200,

frontend/website/src/stores/schedules.ts

@@ -6,6 +6,8 @@ import { API_BASE } from '@/utils/apiBase'
 
 const isoDateSchema = z.string().regex(/^\d{4}-\d{2}-\d{2}$/)
 
+export const workloadPlacementSchema = z.enum(['start', 'middle', 'end'])
+
 export const scheduleSummarySchema = z.object({
   id: z.number().int().positive(),
   set: z.object({
@@ -76,11 +78,13 @@ const errorResponseSchema = z.object({
 export type ScheduleSummary = z.infer<typeof scheduleSummarySchema>
 export type ScheduleDetail = z.infer<typeof scheduleDetailSchema>
 export type AssignmentForDate = z.infer<typeof assignmentForDateSchema>
+export type WorkloadPlacement = z.infer<typeof workloadPlacementSchema>
 export type CreateScheduleInput = {
   setId: number
   levelId: number
   startDate: string
   targetDate: string
+  workloadPlacement: WorkloadPlacement
 }
 
 const LIST_ERROR = "We couldn't load your schedules."

frontend/website/src/views/CreateScheduleView.vue

@@ -5,7 +5,11 @@ import { useRoute, useRouter } from 'vue-router'
 import { z } from 'zod'
 
 import AuthenticatedHeader from '@/components/AuthenticatedHeader.vue'
-import { useSchedulesStore } from '@/stores/schedules'
+import {
+  useSchedulesStore,
+  workloadPlacementSchema,
+  type WorkloadPlacement,
+} from '@/stores/schedules'
 import { useSetLayoutStore } from '@/stores/setLayout'
 
 type ScheduleField = 'levelId' | 'startDate' | 'targetDate'
@@ -22,18 +26,51 @@ const form = reactive({
   levelId: null as number | null,
   startDate: '',
   targetDate: '',
+  workloadPlacement: 'middle' as WorkloadPlacement,
 })
 const fieldErrors = ref<ScheduleFieldErrors>({})
 
 const levels = computed(() =>
   (layout.value?.levels ?? []).filter((level) => level.elementCount > 0),
 )
+const selectedLevel = computed(() => levels.value.find((level) => level.id === form.levelId))
+const workloadPlacementOptions: Array<{
+  value: WorkloadPlacement
+  label: string
+}> = [
+  { value: 'start', label: 'At the start' },
+  { value: 'middle', label: 'In the middle' },
+  { value: 'end', label: 'At the end' },
+]
+const showWorkloadPlacement = computed(() => {
+  if (
+    selectedLevel.value === undefined ||
+    form.startDate === '' ||
+    form.targetDate === '' ||
+    form.targetDate < form.startDate
+  ) {
+    return false
+  }
+
+  const startTime = Date.parse(`${form.startDate}T00:00:00Z`)
+  const targetTime = Date.parse(`${form.targetDate}T00:00:00Z`)
+  if (Number.isNaN(startTime) || Number.isNaN(targetTime)) {
+    return false
+  }
+
+  const millisecondsPerDay = 24 * 60 * 60 * 1000
+  const dayCount = Math.round((targetTime - startTime) / millisecondsPerDay) + 1
+  const assignmentCount = selectedLevel.value.elementCount
+
+  return assignmentCount > dayCount && assignmentCount % dayCount !== 0
+})
 
 const scheduleFormSchema = z
   .object({
     levelId: z.number('Choose a level to schedule.').int().positive(),
     startDate: z.string().min(1, 'Choose a start date.'),
     targetDate: z.string().min(1, 'Choose a target date.'),
+    workloadPlacement: workloadPlacementSchema,
   })
   .superRefine((value, context) => {
     if (value.startDate !== '' && value.targetDate !== '' && value.targetDate < value.startDate) {
@@ -194,6 +231,33 @@ async function retry(): Promise<void> {
             </div>
           </div>
 
+          <fieldset
+            v-if="showWorkloadPlacement"
+            class="workload-placement"
+            data-workload-placement
+            :disabled="creating"
+          >
+            <legend>Heavier days</legend>
+            <p>
+              Some days need one extra assignment. Choose where those days appear in the schedule.
+            </p>
+            <div class="workload-placement__options">
+              <label
+                v-for="option in workloadPlacementOptions"
+                :key="option.value"
+                class="workload-placement__option"
+              >
+                <input
+                  v-model="form.workloadPlacement"
+                  type="radio"
+                  name="workloadPlacement"
+                  :value="option.value"
+                />
+                <span>{{ option.label }}</span>
+              </label>
+            </div>
+          </fieldset>
+
           <p v-if="createError !== null" class="form-error" role="alert">{{ createError }}</p>
 
           <button type="submit" class="primary-button" :disabled="creating">
@@ -290,6 +354,57 @@ h1 {
   gap: 1rem;
 }
 
+.workload-placement {
+  display: grid;
+  gap: 0.75rem;
+  margin: 0;
+  padding: 0;
+  border: 0;
+}
+
+.workload-placement legend {
+  padding: 0;
+  font-size: 0.78rem;
+  font-weight: 800;
+}
+
+.workload-placement > p {
+  margin: 0;
+  color: #68776f;
+  font-size: 0.8rem;
+  line-height: 1.5;
+}
+
+.workload-placement__options {
+  display: grid;
+  grid-template-columns: repeat(3, minmax(0, 1fr));
+  gap: 0.65rem;
+}
+
+.workload-placement__option {
+  display: flex;
+  align-items: center;
+  gap: 0.55rem;
+  min-height: 3rem;
+  padding: 0.7rem 0.8rem;
+  border: 1px solid rgb(24 58 49 / 22%);
+  border-radius: 0.7rem;
+  background: #fffdf7;
+  cursor: pointer;
+}
+
+.workload-placement__option:has(input:checked) {
+  border-color: #183a31;
+  box-shadow: 0 0 0 1px #183a31;
+}
+
+.workload-placement__option input {
+  width: auto;
+  min-height: 0;
+  margin: 0;
+  padding: 0;
+}
+
 label {
   font-size: 0.78rem;
   font-weight: 800;
@@ -380,5 +495,9 @@ input[aria-invalid='true'] {
   .date-fields {
     grid-template-columns: 1fr;
   }
+
+  .workload-placement__options {
+    grid-template-columns: 1fr;
+  }
 }
 </style>