<?php

declare(strict_types=1);

use App\Domain\SmartLink\Services\ShortCodeGenerator;
use App\Domain\SmartLink\ValueObjects\ShortCode;
use Tests\Support\InMemorySmartLinkRepository;

describe('ShortCodeGenerator', function () {
    beforeEach(function () {
        $this->repository = new InMemorySmartLinkRepository();
        $this->generator = new ShortCodeGenerator($this->repository);
    });

    it('generates unique short code', function () {
        $shortCode = $this->generator->generateUnique();

        expect($shortCode)->toBeInstanceOf(ShortCode::class);
        expect($shortCode->toString())->toHaveLength(6);
    });

    it('generates alphanumeric codes', function () {
        $shortCode = $this->generator->generateUnique();

        expect($shortCode->toString())->toMatch('/^[a-zA-Z0-9]{6}$/');
    });

    it('generates different codes on multiple calls', function () {
        $codes = [];

        for ($i = 0; $i < 5; $i++) {
            $codes[] = $this->generator->generateUnique()->toString();
        }

        $uniqueCodes = array_unique($codes);
        expect(count($uniqueCodes))->toBeGreaterThan(3);
    });

    it('generates code with custom length', function () {
        $shortCode = $this->generator->generateUnique(length: 8);

        expect($shortCode->toString())->toHaveLength(8);
    });

    it('returns different code when collision detected', function () {
        // Generate a code and add it to repository
        $firstCode = $this->generator->generateUnique();

        // Manually add the code to repository to simulate it exists
        $link = \App\Domain\SmartLink\Entities\SmartLink::create(
            clock: new \App\Framework\DateTime\SystemClock(),
            shortCode: $firstCode,
            type: \App\Domain\SmartLink\Enums\LinkType::RELEASE,
            title: \App\Domain\SmartLink\ValueObjects\LinkTitle::fromString('Test')
        );
        $this->repository->save($link);

        // Generate another code - should be different
        $secondCode = $this->generator->generateUnique();

        expect($this->repository->existsShortCode($firstCode))->toBeTrue();
        expect($secondCode)->toBeInstanceOf(ShortCode::class);
    });
});