<?php

declare(strict_types=1);

namespace App\Tests\Service;

use App\Service\ErrorCodeService;
use PHPUnit\Framework\TestCase;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;

class ErrorCodeServiceTest extends TestCase
{
    private RequestStack $requestStack;
    private ErrorCodeService $service;

    protected function setUp(): void
    {
        $this->requestStack = new RequestStack();
        $this->service = new ErrorCodeService($this->requestStack);
    }

    public function testReturnsNullWithoutRequest(): void
    {
        $result = $this->service->getErrorCode();

        $this->assertNull($result);
    }

    public function testReturnsNullWithoutRequestId(): void
    {
        $request = new Request();
        $this->requestStack->push($request);

        $result = $this->service->getErrorCode();

        $this->assertNull($result);
    }

    public function testGeneratesCodeWithRequestId(): void
    {
        $request = new Request();
        $request->attributes->set('request_id', 'abc123');
        $this->requestStack->push($request);

        $result = $this->service->getErrorCode();

        $this->assertNotNull($result);
        $this->assertMatchesRegularExpression('/^E-[A-Z0-9]{8}$/', $result);
    }

    public function testGeneratesConsistentCodeForSameRequestId(): void
    {
        $request = new Request();
        $request->attributes->set('request_id', 'abc123');
        $this->requestStack->push($request);

        $result1 = $this->service->getErrorCode();
        $result2 = $this->service->getErrorCode();

        $this->assertSame($result1, $result2);
    }

    public function testGeneratesDifferentCodesForDifferentRequestIds(): void
    {
        $request1 = new Request();
        $request1->attributes->set('request_id', 'abc123');
        $this->requestStack->push($request1);

        $service1 = new ErrorCodeService($this->requestStack);
        $result1 = $service1->getErrorCode();

        $this->requestStack->pop();

        $request2 = new Request();
        $request2->attributes->set('request_id', 'xyz789');
        $this->requestStack->push($request2);

        $service2 = new ErrorCodeService($this->requestStack);
        $result2 = $service2->getErrorCode();

        $this->assertNotSame($result1, $result2);
    }

    public function testSequenceSuffixesProduceSameCode(): void
    {
        $request1 = new Request();
        $request1->attributes->set('request_id', 'abc123_1');
        $this->requestStack->push($request1);

        $service1 = new ErrorCodeService($this->requestStack);
        $result1 = $service1->getErrorCode();

        $this->requestStack->pop();

        $request2 = new Request();
        $request2->attributes->set('request_id', 'abc123_2');
        $this->requestStack->push($request2);

        $service2 = new ErrorCodeService($this->requestStack);
        $result2 = $service2->getErrorCode();

        $this->assertSame($result1, $result2);
    }

    public function testSequenceSuffixMatchesBaseId(): void
    {
        $request1 = new Request();
        $request1->attributes->set('request_id', 'abc123');
        $this->requestStack->push($request1);

        $service1 = new ErrorCodeService($this->requestStack);
        $result1 = $service1->getErrorCode();

        $this->requestStack->pop();

        $request2 = new Request();
        $request2->attributes->set('request_id', 'abc123_5');
        $this->requestStack->push($request2);

        $service2 = new ErrorCodeService($this->requestStack);
        $result2 = $service2->getErrorCode();

        $this->assertSame($result1, $result2);
    }

    public function testHasErrorReturnsFalseByDefault(): void
    {
        $this->assertFalse($this->service->hasError());
    }

    public function testMarkErrorOccurredSetsFlag(): void
    {
        $this->service->markErrorOccurred();

        $this->assertTrue($this->service->hasError());
    }

    public function testHasErrorRemainsTrueAfterMultipleCalls(): void
    {
        $this->service->markErrorOccurred();
        $this->service->markErrorOccurred();

        $this->assertTrue($this->service->hasError());
    }
}