<?php

namespace App\Tests\Service\Pdf;

use App\Entity\Teamer;
use App\Entity\TeamerWorkMonth;
use App\Model\WorkMonthDays;
use App\Service\Pdf\WorkMonthRenderer;
use Symfony\Bundle\FrameworkBundle\Test\WebTestCase;
use Twig\Environment;

/**
 * Renders a real document rather than mocking Twig: the point of the test is that the
 * template, the duration filter and Dompdf agree with each other.
 */
class WorkMonthRendererTest extends WebTestCase
{
    public function testItRendersAPdf(): void
    {
        $pdf = $this->render($this->createWorkMonth());

        $this->assertStringStartsWith('%PDF', $pdf);
        $this->assertGreaterThan(2000, strlen($pdf), 'A month of rows should not fit in a stub.');
    }

    /**
     * A month whose days the SaaS never reported still has to produce a full sheet, so the
     * teamer can write on the empty lines.
     */
    public function testItPlacesTheLogoInTheTopRightCorner(): void
    {
        $pdf = $this->render($this->createWorkMonth());

        // A4 is 595.28 x 841.89pt and the page margins are 15mm at the side, 18mm at the top,
        // so the content corner sits at 552.76 / 790.87. Asserting the placement rather than
        // the markup is the only way to know the logo actually landed there.
        $this->assertSame(1, preg_match(
            '#([\d.]+) 0 0 ([\d.]+) ([\d.]+) ([\d.]+) cm\s*/\w+ Do#',
            $this->contentStreams($pdf),
            $placement
        ), 'The logo should be drawn exactly once.');

        [, $width, $height, $x, $y] = array_map('floatval', $placement);

        $this->assertEqualsWithDelta(552.76, $x + $width, 1.0, 'Flush with the right margin.');
        $this->assertEqualsWithDelta(790.87, $y + $height, 1.0, 'Flush with the top margin.');
        $this->assertEqualsWithDelta(230 / 70, $width / $height, 0.05, 'The logo must not be stretched.');
    }

    /**
     * A working-time record is worth printing without its letterhead.
     */
    public function testItRendersWithoutALogo(): void
    {
        $renderer = new WorkMonthRenderer(
            static::getContainer()->get(Environment::class),
            ['project_dir' => sys_get_temp_dir()],
        );

        $this->assertStringStartsWith('%PDF', $renderer->render($this->createWorkMonth()));
    }

    private function contentStreams(string $pdf): string
    {
        preg_match_all('#stream\r?\n(.*?)endstream#s', $pdf, $matches);

        $decoded = '';

        foreach ($matches[1] as $stream) {
            $inflated = @gzuncompress(ltrim($stream, "\r\n"));

            if (false !== $inflated) {
                $decoded .= $inflated;
            }
        }

        return $decoded;
    }

    public function testItRendersAMonthWithoutAnyBookings(): void
    {
        $workMonth = (new TeamerWorkMonth())
            ->setTeamer($this->createTeamer())
            ->setYear(2026)
            ->setMonth(2)
            ->setDays(WorkMonthDays::fromArray([]))
        ;

        $this->assertStringStartsWith('%PDF', $this->render($workMonth));
    }

    public function testTheFilenameCarriesTheTeamerAndTheMonth(): void
    {
        $this->assertSame(
            'Arbeitszeitnachweis_Test_2026-03.pdf',
            $this->createRenderer()->filename($this->createWorkMonth()),
        );
    }

    public function testTheFilenameSurvivesAnAwkwardName(): void
    {
        $renderer = $this->createRenderer();
        $workMonth = $this->createWorkMonth();
        $workMonth->getTeamer()->setLastName('Müller-Lüdenscheidt');

        $this->assertSame('Arbeitszeitnachweis_M_ller_L_denscheidt_2026-03.pdf', $renderer->filename($workMonth));
    }

    private function render(TeamerWorkMonth $workMonth): string
    {
        return $this->createRenderer()->render($workMonth);
    }

    private function createRenderer(): WorkMonthRenderer
    {
        $projectDir = static::getContainer()->getParameter('kernel.project_dir');

        /** @var Environment $twig */
        $twig = static::getContainer()->get(Environment::class);

        return new WorkMonthRenderer($twig, ['project_dir' => $projectDir]);
    }

    private function createWorkMonth(): TeamerWorkMonth
    {
        return (new TeamerWorkMonth())
            ->setTeamer($this->createTeamer())
            ->setYear(2026)
            ->setMonth(3)
            ->setDays(WorkMonthDays::fromArray([
                '2026-03-01' => ['minutes' => 285],
                '2026-03-05' => ['minutes' => 0, 'absence' => 'Ruhetag 24/25'],
                '2026-03-12' => ['minutes' => 510],
            ]))
            ->setSourceIstMinutes(795)
        ;
    }

    private function createTeamer(): Teamer
    {
        return (new Teamer())->setFirstName('Theo')->setLastName('Test');
    }
}