<?php

declare(strict_types=1);

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

use App\Administration\Application\Command\UpdateSubject\UpdateSubjectCommand;
use App\Administration\Application\Command\UpdateSubject\UpdateSubjectHandler;
use App\Administration\Domain\Exception\SubjectDejaExistanteException;
use App\Administration\Domain\Exception\SubjectNotFoundException;
use App\Administration\Domain\Model\SchoolClass\SchoolId;
use App\Administration\Domain\Model\Subject\Subject;
use App\Administration\Domain\Model\Subject\SubjectCode;
use App\Administration\Domain\Model\Subject\SubjectColor;
use App\Administration\Domain\Model\Subject\SubjectName;
use App\Administration\Infrastructure\Persistence\InMemory\InMemorySubjectRepository;
use App\Shared\Domain\Clock;
use App\Shared\Domain\Tenant\TenantId;
use DateTimeImmutable;
use PHPUnit\Framework\Attributes\Test;
use PHPUnit\Framework\TestCase;

final class UpdateSubjectHandlerTest extends TestCase
{
    private const string TENANT_ID = '550e8400-e29b-41d4-a716-446655440001';
    private const string OTHER_TENANT_ID = '550e8400-e29b-41d4-a716-446655440099';
    private const string SCHOOL_ID = '550e8400-e29b-41d4-a716-446655440002';

    private InMemorySubjectRepository $subjectRepository;
    private Clock $clock;

    protected function setUp(): void
    {
        $this->subjectRepository = new InMemorySubjectRepository();
        $this->clock = new class implements Clock {
            public function now(): DateTimeImmutable
            {
                return new DateTimeImmutable('2026-02-01 10:00:00');
            }
        };
    }

    #[Test]
    public function itUpdatesSubjectName(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            name: 'Mathématiques avancées',
        );

        $updatedSubject = $handler($command);

        self::assertSame('Mathématiques avancées', (string) $updatedSubject->name);
    }

    #[Test]
    public function itUpdatesSubjectCode(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            code: 'MATHS',
        );

        $updatedSubject = $handler($command);

        self::assertSame('MATHS', (string) $updatedSubject->code);
    }

    #[Test]
    public function itUpdatesSubjectColor(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            color: '#EF4444',
        );

        $updatedSubject = $handler($command);

        self::assertNotNull($updatedSubject->color);
        self::assertSame('#EF4444', (string) $updatedSubject->color);
    }

    #[Test]
    public function itClearsSubjectColor(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            clearColor: true,
        );

        $updatedSubject = $handler($command);

        self::assertNull($updatedSubject->color);
    }

    #[Test]
    public function itUpdatesSubjectDescription(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            description: 'Cours de mathématiques pour tous les niveaux',
        );

        $updatedSubject = $handler($command);

        self::assertSame('Cours de mathématiques pour tous les niveaux', $updatedSubject->description);
    }

    #[Test]
    public function itClearsSubjectDescription(): void
    {
        $subject = $this->createAndSaveSubject();
        // First add a description
        $subject->decrire('Une description', new DateTimeImmutable());
        $this->subjectRepository->save($subject);

        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            clearDescription: true,
        );

        $updatedSubject = $handler($command);

        self::assertNull($updatedSubject->description);
    }

    #[Test]
    public function itThrowsExceptionWhenChangingToExistingCode(): void
    {
        // Create first subject with code MATH
        $subject1 = $this->createAndSaveSubject();

        // Create second subject with code FR
        $subject2 = Subject::creer(
            tenantId: TenantId::fromString(self::TENANT_ID),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            name: new SubjectName('Français'),
            code: new SubjectCode('FR'),
            color: new SubjectColor('#EF4444'),
            createdAt: new DateTimeImmutable('2026-01-15 10:00:00'),
        );
        $this->subjectRepository->save($subject2);

        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        // Try to change subject2's code to MATH (which already exists)
        $this->expectException(SubjectDejaExistanteException::class);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject2->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            code: 'MATH',
        );
        $handler($command);
    }

    #[Test]
    public function itAllowsKeepingSameCode(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        // Update name but keep same code
        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            name: 'Maths avancées',
            code: 'MATH',  // Same code
        );

        $updatedSubject = $handler($command);

        self::assertSame('Maths avancées', (string) $updatedSubject->name);
        self::assertSame('MATH', (string) $updatedSubject->code);
    }

    #[Test]
    public function itUpdatesMultipleFieldsAtOnce(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::TENANT_ID,
            schoolId: self::SCHOOL_ID,
            name: 'Maths avancées',
            color: '#10B981',
            description: 'Niveau supérieur',
        );

        $updatedSubject = $handler($command);

        self::assertSame('Maths avancées', (string) $updatedSubject->name);
        self::assertNotNull($updatedSubject->color);
        self::assertSame('#10B981', (string) $updatedSubject->color);
        self::assertSame('Niveau supérieur', $updatedSubject->description);
    }

    #[Test]
    public function itThrowsExceptionWhenSubjectBelongsToDifferentTenant(): void
    {
        $subject = $this->createAndSaveSubject();
        $handler = new UpdateSubjectHandler($this->subjectRepository, $this->clock);

        $this->expectException(SubjectNotFoundException::class);

        // Try to update with a different tenant ID (tenant isolation violation)
        $command = new UpdateSubjectCommand(
            subjectId: (string) $subject->id,
            tenantId: self::OTHER_TENANT_ID,
            schoolId: self::SCHOOL_ID,
            name: 'Tentative de modification',
        );
        $handler($command);
    }

    private function createAndSaveSubject(): Subject
    {
        $subject = Subject::creer(
            tenantId: TenantId::fromString(self::TENANT_ID),
            schoolId: SchoolId::fromString(self::SCHOOL_ID),
            name: new SubjectName('Mathématiques'),
            code: new SubjectCode('MATH'),
            color: new SubjectColor('#3B82F6'),
            createdAt: new DateTimeImmutable('2026-01-15 10:00:00'),
        );
        $this->subjectRepository->save($subject);

        return $subject;
    }
}