<?php

namespace Tests\Support;

/** Valid original bytes for QA only; never an official/legal document. */
final class SyntheticDocument
{
    public static function pdf(string $text = 'Synthetic QA document - no official or legal value'): string
    {
        $text = str_replace(['\\', '(', ')'], ['\\\\', '\\(', '\\)'], $text);
        $stream = 'BT /F1 12 Tf 12 60 Td ('.$text.') Tj ET';
        $objects = [
            '<< /Type /Catalog /Pages 2 0 R >>',
            '<< /Type /Pages /Kids [3 0 R] /Count 1 >>',
            '<< /Type /Page /Parent 2 0 R /MediaBox [0 0 600 100] /Resources << /Font << /F1 4 0 R >> >> /Contents 5 0 R >>',
            '<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>',
            '<< /Length '.strlen($stream)." >>\nstream\n".$stream."\nendstream",
        ];
        $pdf = "%PDF-1.4\n% Synthetic QA original\n";
        $offsets = [];
        foreach ($objects as $index => $object) {
            $offsets[] = strlen($pdf);
            $pdf .= ($index + 1)." 0 obj\n".$object."\nendobj\n";
        }
        $xref = strlen($pdf);
        $pdf .= "xref\n0 6\n0000000000 65535 f \n";
        foreach ($offsets as $offset) {
            $pdf .= sprintf('%010d 00000 n ', $offset)."\n";
        }

        return $pdf."trailer\n<< /Size 6 /Root 1 0 R >>\nstartxref\n".$xref."\n%%EOF\n";
    }
}