<?php

declare(strict_types=1);

require_once __DIR__ . '/../../vendor/autoload.php';

use App\Framework\QrCode\QrCodeGenerator;
use App\Framework\QrCode\ValueObjects\ErrorCorrectionLevel;
use App\Framework\QrCode\ValueObjects\QrCodeConfig;
use App\Framework\QrCode\ValueObjects\QrCodeVersion;
use App\Framework\QrCode\ValueObjects\EncodingMode;

echo "=== Mask Pattern Investigation ===\n\n";

// Generate QR code
$config = new QrCodeConfig(
    version: QrCodeVersion::fromNumber(1),
    errorCorrectionLevel: ErrorCorrectionLevel::M,
    encodingMode: EncodingMode::BYTE
);

$matrix = QrCodeGenerator::generate("HELLO WORLD", $config);

// Read format info
$formatCols = [0, 1, 2, 3, 4, 5, 7, 8, 20, 19, 18, 17, 16, 15, 14];
$formatH = '';
foreach ($formatCols as $col) {
    $formatH .= $matrix->getModuleAt(8, $col)->isDark() ? '1' : '0';
}

echo "Our Format Info: $formatH\n";

// Decode
$xorMask = "101010000010010";
$unmasked = '';
for ($i = 0; $i < 15; $i++) {
    $unmasked .= (int)$formatH[$i] ^ (int)$xorMask[$i];
}

$ecBits = substr($unmasked, 0, 2);
$maskBits = substr($unmasked, 2, 3);

echo "Unmasked: $unmasked\n";
echo "EC Bits: $ecBits\n";
echo "Mask Bits: $maskBits\n";
echo "Our Mask Pattern: " . bindec($maskBits) . "\n\n";

// Python uses mask 0
echo "Python Format Info: 101010000010010 (M, Mask 0)\n";
echo "Python Mask Pattern: 0\n\n";

echo "=== PROBLEM FOUND ===\n";
echo "We're using Mask Pattern " . bindec($maskBits) . ", Python uses Mask Pattern 0!\n";
echo "Different masks = completely different QR codes!\n\n";

echo "Solution: Either\n";
echo "1. Use Mask Pattern 0 specifically\n";
echo "2. Ensure our mask pattern is applied correctly\n";