<?php

declare(strict_types=1);

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

use App\Framework\QrCode\ErrorCorrection\ReedSolomonEncoder;
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 "=== Reed-Solomon Validation Test ===\n\n";

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

// Get data codewords
$generator = new \App\Framework\QrCode\QrCodeGenerator(new \App\Framework\QrCode\QrCodeRenderer());
$reflection = new \ReflectionClass($generator);
$encodeMethod = $reflection->getMethod('encodeData');
$encodeMethod->setAccessible(true);

$dataCodewords = $encodeMethod->invoke($generator, $testData, $config);

echo "Data codewords (" . count($dataCodewords) . "):\n";
echo implode(', ', $dataCodewords) . "\n\n";

// Generate EC codewords
$reedSolomon = new ReedSolomonEncoder();
$ecInfo = ReedSolomonEncoder::getECInfo(1, 'M');
$ecCodewords = $reedSolomon->encode($dataCodewords, $ecInfo['ecCodewords']);

echo "EC codewords (" . count($ecCodewords) . "):\n";
echo implode(', ', $ecCodewords) . "\n\n";

// Known reference for "HELLO WORLD" Version 1 Level M:
// Data codewords: 64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233
// EC codewords should be calculated from these

echo "=== Validation ===\n";
echo "Expected data codewords (16):\n";
echo "64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233\n\n";

$expectedData = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233];
$matches = 0;
for ($i = 0; $i < min(count($dataCodewords), count($expectedData)); $i++) {
    if ($dataCodewords[$i] === $expectedData[$i]) {
        $matches++;
    } else {
        echo "❌ Data codeword {$i}: got {$dataCodewords[$i]}, expected {$expectedData[$i]}\n";
    }
}

if ($matches === count($expectedData)) {
    echo "✅ All data codewords match reference!\n\n";
} else {
    echo "❌ {$matches}/" . count($expectedData) . " data codewords match\n\n";
}

// Test Reed-Solomon encoding
// For Version 1, Level M: 16 data codewords, 10 EC codewords
// Using known generator polynomial for 10 EC codewords
echo "=== Reed-Solomon Generator Polynomial Test ===\n";

// Test GF multiplication
$gf = new ReedSolomonEncoder();
$reflectionRS = new \ReflectionClass($gf);
$gfMultiplyMethod = $reflectionRS->getMethod('gfMultiply');
$gfMultiplyMethod->setAccessible(true);

// Test some known GF multiplications
$testCases = [
    [1, 2, 2],  // 1 * 2 = 2
    [2, 3, 6],  // 2 * 3 = 6
    [87, 1, 87], // Generator polynomial coefficient
];

echo "Testing GF multiplication:\n";
foreach ($testCases as [$a, $b, $expected]) {
    $result = $gfMultiplyMethod->invoke($gf, $a, $b);
    $match = $result === $expected ? '✅' : '❌';
    echo "  {$a} * {$b} = {$result} (expected: {$expected}) {$match}\n";
}

echo "\n=== EC Codeword Verification ===\n";
echo "EC codewords generated: " . count($ecCodewords) . " (expected: 10)\n";
if (count($ecCodewords) === 10) {
    echo "✅ EC codeword count is correct\n";
} else {
    echo "❌ EC codeword count is wrong!\n";
}

// Verify EC codewords by checking if they can correct errors
// This is a simplified check - full verification would require decoding
echo "\nNote: Full EC verification requires decoding with error injection.\n";
echo "If EC codewords are wrong, the QR code won't be scannable even if data is correct.\n";