<?php

declare(strict_types=1);

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

use App\Framework\QrCode\ErrorCorrection\ReedSolomonEncoder;

echo "=== Final RS Fix Test ===\n\n";

// The key insight: In QR codes, the polynomial representation might be different
// Standard RS: c(x) = c[0] + c[1]*x + c[2]*x^2 + ... + c[n-1]*x^(n-1)
// QR code RS: c(x) = c[0]*x^(n-1) + c[1]*x^(n-2) + ... + c[n-1]*x^0 (MSB-first)

// This means we might need to reverse the codewords for RS encoding/decoding

$data = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 36, 196, 64, 236, 17, 236];
$ecCodewords = 10;

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

// Try encoding with data in reverse order (LSB-first representation)
$reversedData = array_reverse($data);
echo "Reversed data (for RS encoding): " . implode(', ', $reversedData) . "\n\n";

$rs = new ReedSolomonEncoder();
$ec = $rs->encode($reversedData, $ecCodewords);

echo "EC codewords (from reversed data): " . implode(', ', $ec) . "\n\n";

// Reverse EC codewords back
$ecReversed = array_reverse($ec);
echo "EC codewords (reversed back): " . implode(', ', $ecReversed) . "\n\n";

// Test with decoder - need to reverse everything
require_once __DIR__ . '/test-reed-solomon-decoder.php';

// For decoder, we also need to reverse
$decoder = new SimpleRSDecoder();
$fullCodeword = array_merge($data, $ecReversed);
$fullReversed = array_reverse($fullCodeword);

$syndromes = $decoder->calculateSyndromes($fullReversed, $ecCodewords);

echo "Syndromes (with reversed codeword): " . implode(', ', $syndromes) . "\n";
$allZero = true;
foreach ($syndromes as $s) {
    if ($s !== 0) {
        $allZero = false;
        break;
    }
}

if ($allZero) {
    echo "\n✅ ALL SYNDROMES ARE ZERO!\n";
    echo "\nThis means we need to reverse codewords for RS encoding!\n";
} else {
    echo "\n❌ Still wrong\n";
}