<?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;
use App\Framework\QrCode\Masking\MaskPattern;

echo "=== Comparing Unmasked Data ===\n\n";

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

$ourMatrix = QrCodeGenerator::generate("HELLO WORLD", $config);
$size = 21;

// Our mask is Pattern 2: column % 3 == 0
// Unmask a few data positions by applying mask again
$mask2 = MaskPattern::PATTERN_2;

echo "Unmasking our data (applying mask 2 again to reverse):\n";
echo "Testing positions in data area:\n\n";

$testPositions = [
    [20, 20], // Bottom-right
    [20, 19],
    [19, 20],
    [18, 20],
    [17, 20],
];

foreach ($testPositions as [$row, $col]) {
    $maskedValue = $ourMatrix->getModuleAt($row, $col)->isDark() ? 1 : 0;
    $shouldInvert = $mask2->shouldInvert($row, $col);
    $unmaskedValue = $shouldInvert ? (1 - $maskedValue) : $maskedValue;
    
    echo sprintf(
        "  [%2d,%2d]: masked=%d, shouldInvert=%s, unmasked=%d\n",
        $row, $col,
        $maskedValue,
        $shouldInvert ? 'Y' : 'N',
        $unmaskedValue
    );
}

echo "\nThis shows the actual data bits before masking.\n";
echo "If data placement is correct, these should match the encoded codewords.\n";