<?php

declare(strict_types=1);

namespace App\Tests\Unit\Administration\Application\Command\ChangeStudentClass;

use App\Administration\Application\Command\ChangeStudentClass\ChangeStudentClassCommand;
use App\Administration\Application\Command\ChangeStudentClass\ChangeStudentClassHandler;
use App\Administration\Domain\Exception\ClasseNotFoundException;
use App\Administration\Domain\Model\ClassAssignment\ClassAssignment;
use App\Administration\Domain\Model\SchoolClass\AcademicYearId;
use App\Administration\Domain\Model\SchoolClass\ClassId;
use App\Administration\Domain\Model\SchoolClass\ClassName;
use App\Administration\Domain\Model\SchoolClass\ClassStatus;
use App\Administration\Domain\Model\SchoolClass\SchoolClass;
use App\Administration\Domain\Model\SchoolClass\SchoolId;
use App\Administration\Domain\Model\SchoolClass\SchoolLevel;
use App\Administration\Domain\Model\User\UserId;
use App\Administration\Infrastructure\Persistence\InMemory\InMemoryClassAssignmentRepository;
use App\Administration\Infrastructure\Persistence\InMemory\InMemoryClassRepository;
use App\Shared\Domain\Clock;
use App\Shared\Domain\Tenant\TenantId;
use DateTimeImmutable;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

final class ChangeStudentClassHandlerTest extends TestCase
{
    private const string TENANT_ID = '550e8400-e29b-41d4-a716-446655440001';
    private const string OLD_CLASS_ID = '550e8400-e29b-41d4-a716-446655440020';
    private const string NEW_CLASS_ID = '550e8400-e29b-41d4-a716-446655440021';
    private const string ACADEMIC_YEAR_ID = '550e8400-e29b-41d4-a716-446655440040';
    private const string SCHOOL_ID = '550e8400-e29b-41d4-a716-446655440050';
    private const string STUDENT_ID = '550e8400-e29b-41d4-a716-446655440060';

    private InMemoryClassAssignmentRepository $classAssignmentRepository;
    private InMemoryClassRepository $classRepository;
    private Clock $clock;

    protected function setUp(): void
    {
        $this->classAssignmentRepository = new InMemoryClassAssignmentRepository();
        $this->classRepository = new InMemoryClassRepository();
        $this->clock = new class implements Clock {
            public function now(): DateTimeImmutable
            {
                return new DateTimeImmutable('2026-02-21 10:00:00');
            }
        };

        $this->seedTestData();
    }

    #[Test]
    public function itChangesStudentClass(): void
    {
        $handler = $this->createHandler();
        $command = $this->createCommand();

        $assignment = $handler($command);

        self::assertTrue($assignment->classId->equals(ClassId::fromString(self::NEW_CLASS_ID)));
    }

    #[Test]
    public function itThrowsWhenNewClassDoesNotExist(): void
    {
        $handler = $this->createHandler();
        $command = $this->createCommand(newClassId: '550e8400-e29b-41d4-a716-446655440099');

        $this->expectException(ClasseNotFoundException::class);
        $handler($command);
    }

    #[Test]
    public function itCreatesAssignmentWhenNoneExists(): void
    {
        $handler = $this->createHandler();
        $newStudentId = '550e8400-e29b-41d4-a716-446655440070';
        $command = $this->createCommand(studentId: $newStudentId);

        $assignment = $handler($command);

        self::assertTrue($assignment->studentId->equals(UserId::fromString($newStudentId)));
        self::assertTrue($assignment->classId->equals(ClassId::fromString(self::NEW_CLASS_ID)));
        self::assertTrue($assignment->academicYearId->equals(AcademicYearId::fromString(self::ACADEMIC_YEAR_ID)));
    }

    #[Test]
    public function itThrowsWhenClassBelongsToAnotherTenant(): void
    {
        $crossTenantClassId = '550e8400-e29b-41d4-a716-446655440030';
        $this->classRepository->save(SchoolClass::reconstitute(
            id: ClassId::fromString($crossTenantClassId),
            tenantId: TenantId::fromString('550e8400-e29b-41d4-a716-446655440002'),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            academicYearId: AcademicYearId::fromString(self::ACADEMIC_YEAR_ID),
            name: new ClassName('5ème B'),
            level: SchoolLevel::CINQUIEME,
            capacity: 30,
            status: ClassStatus::ACTIVE,
            description: null,
            createdAt: new DateTimeImmutable('2026-01-15'),
            updatedAt: new DateTimeImmutable('2026-01-15'),
            deletedAt: null,
        ));

        $handler = $this->createHandler();
        $command = $this->createCommand(newClassId: $crossTenantClassId);

        $this->expectException(ClasseNotFoundException::class);
        $handler($command);
    }

    #[Test]
    public function itThrowsWhenClassIsArchived(): void
    {
        $archivedClassId = '550e8400-e29b-41d4-a716-446655440031';
        $this->classRepository->save(SchoolClass::reconstitute(
            id: ClassId::fromString($archivedClassId),
            tenantId: TenantId::fromString(self::TENANT_ID),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            academicYearId: AcademicYearId::fromString(self::ACADEMIC_YEAR_ID),
            name: new ClassName('6ème C'),
            level: SchoolLevel::SIXIEME,
            capacity: 30,
            status: ClassStatus::ARCHIVED,
            description: null,
            createdAt: new DateTimeImmutable('2026-01-15'),
            updatedAt: new DateTimeImmutable('2026-01-15'),
            deletedAt: null,
        ));

        $handler = $this->createHandler();
        $command = $this->createCommand(newClassId: $archivedClassId);

        $this->expectException(ClasseNotFoundException::class);
        $handler($command);
    }

    private function seedTestData(): void
    {
        $oldClass = SchoolClass::reconstitute(
            id: ClassId::fromString(self::OLD_CLASS_ID),
            tenantId: TenantId::fromString(self::TENANT_ID),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            academicYearId: AcademicYearId::fromString(self::ACADEMIC_YEAR_ID),
            name: new ClassName('6ème A'),
            level: SchoolLevel::SIXIEME,
            capacity: 30,
            status: ClassStatus::ACTIVE,
            description: null,
            createdAt: new DateTimeImmutable('2026-01-15'),
            updatedAt: new DateTimeImmutable('2026-01-15'),
            deletedAt: null,
        );
        $this->classRepository->save($oldClass);

        $newClass = SchoolClass::reconstitute(
            id: ClassId::fromString(self::NEW_CLASS_ID),
            tenantId: TenantId::fromString(self::TENANT_ID),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            academicYearId: AcademicYearId::fromString(self::ACADEMIC_YEAR_ID),
            name: new ClassName('6ème B'),
            level: SchoolLevel::SIXIEME,
            capacity: 30,
            status: ClassStatus::ACTIVE,
            description: null,
            createdAt: new DateTimeImmutable('2026-01-15'),
            updatedAt: new DateTimeImmutable('2026-01-15'),
            deletedAt: null,
        );
        $this->classRepository->save($newClass);

        $assignment = ClassAssignment::affecter(
            tenantId: TenantId::fromString(self::TENANT_ID),
            studentId: UserId::fromString(self::STUDENT_ID),
            classId: ClassId::fromString(self::OLD_CLASS_ID),
            academicYearId: AcademicYearId::fromString(self::ACADEMIC_YEAR_ID),
            assignedAt: new DateTimeImmutable('2026-01-20'),
        );
        $this->classAssignmentRepository->save($assignment);
    }

    private function createHandler(): ChangeStudentClassHandler
    {
        return new ChangeStudentClassHandler(
            $this->classAssignmentRepository,
            $this->classRepository,
            $this->clock,
        );
    }

    private function createCommand(
        ?string $newClassId = null,
        ?string $studentId = null,
    ): ChangeStudentClassCommand {
        return new ChangeStudentClassCommand(
            tenantId: self::TENANT_ID,
            studentId: $studentId ?? self::STUDENT_ID,
            newClassId: $newClassId ?? self::NEW_CLASS_ID,
            academicYearId: self::ACADEMIC_YEAR_ID,
        );
    }
}