<?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 Issue Analysis ===\n\n";

$testData = 'HELLO WORLD';
$config = new QrCodeConfig(
    version: QrCodeVersion::fromNumber(1),
    errorCorrectionLevel: ErrorCorrectionLevel::M,
    encodingMode: EncodingMode::BYTE
);

$matrix = QrCodeGenerator::generate($testData, $config);

// Decode format information
$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';
}

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

$maskBits = substr($unmasked, 2, 5);
$maskPattern = bindec($maskBits);

echo "Decoded Mask Pattern: {$maskPattern}\n";
echo "Mask Bits: {$maskBits}\n\n";

if ($maskPattern > 7) {
    echo "❌ PROBLEM: Mask Pattern is {$maskPattern}, but should be 0-7!\n";
    echo "This means the format information is incorrect.\n";
    echo "The mask bits are 5 bits, so max value is 31.\n";
    echo "But QR codes only use mask patterns 0-7 (3 bits).\n\n";
    
    // Check what the actual mask pattern should be
    echo "Checking what mask pattern should be used...\n";
    
    // The mask pattern selection should be based on penalty scoring
    // Let's check what mask pattern was actually applied
} else {
    echo "✅ Mask Pattern is valid (0-7)\n";
}

// Check if we can identify which mask pattern was actually used
// by checking the data placement pattern
echo "\n=== Checking Data Placement ===\n";
echo "For Version 1, Level M, we have 16 data codewords + 10 EC codewords = 26 total\n";
echo "Each codeword is 8 bits, so 26 * 8 = 208 bits of data\n";
echo "Plus mode (4 bits) + count (8 bits) = 12 bits overhead\n";
echo "Total data bits: 220 bits\n\n";

// Count dark modules in data area (excluding function patterns)
$dataAreaDark = 0;
$dataAreaTotal = 0;

for ($row = 0; $row < 21; $row++) {
    for ($col = 0; $col < 21; $col++) {
        // Skip function patterns
        if (
            // Finder patterns
            ($row <= 8 && $col <= 8) ||
            ($row <= 7 && $col >= 13) ||
            ($row >= 13 && $col <= 7) ||
            // Timing patterns
            $row === 6 || $col === 6 ||
            // Format info
            ($row === 8 && ($col <= 8 || $col >= 13)) ||
            ($col === 8 && ($row <= 7 || $row >= 9)) ||
            // Dark module
            ($row === 13 && $col === 8)
        ) {
            continue;
        }
        
        $dataAreaTotal++;
        if ($matrix->getModuleAt($row, $col)->isDark()) {
            $dataAreaDark++;
        }
    }
}

echo "Data area modules: {$dataAreaTotal}\n";
echo "Dark modules in data area: {$dataAreaDark}\n";
echo "Light modules in data area: " . ($dataAreaTotal - $dataAreaDark) . "\n";
echo "Dark ratio: " . number_format(($dataAreaDark / $dataAreaTotal) * 100, 2) . "%\n\n";

// For a scannable QR code, the dark ratio should be around 50%
// But with masking, it can vary
if ($dataAreaDark > 0 && $dataAreaTotal > 0) {
    echo "✅ Data area has modules\n";
} else {
    echo "❌ Data area is empty - this is a problem!\n";
}