<?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 "=== Generating Side-by-Side Comparison ===\n\n";

// 1. 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;

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

echo "Our QR Code:\n";
echo "  Format Info: $ourFormat\n";
echo "  Decoded: M, Mask 2\n\n";

// 2. Load Python reference
$pythonImg = imagecreatefrompng('/var/www/html/public/qrcode-python-large.png');

function getPythonBit($img, $row, $col): string {
    $scale = 20;
    $qz = 4;
    $x = ($qz + $col) * $scale + 10;
    $y = ($qz + $row) * $scale + 10;
    $rgb = imagecolorat($img, $x, $y);
    $r = ($rgb >> 16) & 0xFF;
    return $r < 128 ? '1' : '0';
}

$pythonFormat = '';
foreach ($formatCols as $col) {
    $pythonFormat .= getPythonBit($pythonImg, 8, $col);
}

echo "Python QR Code:\n";
echo "  Format Info: $pythonFormat\n";
echo "  Decoded: M, Mask 0\n\n";

// 3. Create comparison image (side-by-side)
$scale = 15;
$qz = 4;
$qrSize = ($size + 2 * $qz) * $scale;
$totalWidth = $qrSize * 2 + 60; // Two QR codes + spacing
$totalHeight = $qrSize + 80;

$image = imagecreatetruecolor($totalWidth, $totalHeight);
$white = imagecolorallocate($image, 255, 255, 255);
$black = imagecolorallocate($image, 0, 0, 0);
$red = imagecolorallocate($image, 255, 0, 0);
$gray = imagecolorallocate($image, 200, 200, 200);

imagefill($image, 0, 0, $white);

// Draw labels
imagestring($image, 5, 40, 10, "OUR CODE (Mask 2)", $black);
imagestring($image, 5, $qrSize + 80, 10, "PYTHON (Mask 0 - WORKS!)", $black);

// Draw grid background
for ($r = 0; $r < $size; $r++) {
    for ($c = 0; $c < $size; $c++) {
        // Our code (left)
        $x1 = ($qz + $c) * $scale + 20;
        $y1 = ($qz + $r) * $scale + 40;
        imagerectangle($image, $x1, $y1, $x1+$scale-1, $y1+$scale-1, $gray);
        
        // Python (right)
        $x2 = $qrSize + 40 + ($qz + $c) * $scale;
        $y2 = ($qz + $r) * $scale + 40;
        imagerectangle($image, $x2, $y2, $x2+$scale-1, $y2+$scale-1, $gray);
    }
}

// Draw modules
$diffCount = 0;
for ($r = 0; $r < $size; $r++) {
    for ($c = 0; $c < $size; $c++) {
        $ourDark = $ourMatrix->getModuleAt($r, $c)->isDark();
        $pythonDark = getPythonBit($pythonImg, $r, $c) === '1';
        
        // Our code
        if ($ourDark) {
            $x = ($qz + $c) * $scale + 20;
            $y = ($qz + $r) * $scale + 40;
            imagefilledrectangle($image, $x, $y, $x+$scale-1, $y+$scale-1, $black);
        }
        
        // Python code
        if ($pythonDark) {
            $x = $qrSize + 40 + ($qz + $c) * $scale;
            $y = ($qz + $r) * $scale + 40;
            imagefilledrectangle($image, $x, $y, $x+$scale-1, $y+$scale-1, $black);
        }
        
        // Mark differences in red
        if ($ourDark !== $pythonDark) {
            $diffCount++;
            // Mark on our code
            $x = ($qz + $c) * $scale + 20 + $scale/2;
            $y = ($qz + $r) * $scale + 40 + $scale/2;
            imagefilledellipse($image, (int)$x, (int)$y, 3, 3, $red);
        }
    }
}

// Add diff count
$diffText = "Differences: $diffCount modules (" . number_format($diffCount / 441 * 100, 1) . "%)";
imagestring($image, 3, 20, $qrSize + 50, $diffText, $black);

imagepng($image, '/var/www/html/public/qr-comparison.png');
imagedestroy($image);
imagedestroy($pythonImg);

echo "✅ Generated comparison: qr-comparison.png\n";
echo "   Differences: $diffCount / 441 modules (" . number_format($diffCount / 441 * 100, 1) . "%)\n";
echo "\nURL: https://localhost/qr-comparison.png\n";