<?php

declare(strict_types=1);

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

use App\Framework\QrCode\ErrorCorrection\ReedSolomonEncoder;

echo "=== RS EC Codewords Reference Test ===\n\n";

// Known reference data codewords for "HELLO WORLD" Version 1, Level M
// From QR code specification examples
$referenceDataCodewords = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 174, 59, 64, 109, 236, 233];

// But wait - our encoding produces different codewords starting at index 10
// Let's check what our actual encoding produces
$ourDataCodewords = [64, 180, 132, 84, 196, 196, 242, 5, 116, 245, 36, 196, 64, 236, 17, 236];

echo "Reference data codewords (from spec):\n";
echo implode(', ', $referenceDataCodewords) . "\n\n";

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

// Compare
echo "Differences:\n";
for ($i = 0; $i < min(count($referenceDataCodewords), count($ourDataCodewords)); $i++) {
    if ($referenceDataCodewords[$i] !== $ourDataCodewords[$i]) {
        echo "  Codeword {$i}: reference={$referenceDataCodewords[$i]}, ours={$ourDataCodewords[$i]}\n";
    }
}
echo "\n";

// Now test RS encoding with reference data codewords
echo "=== Testing RS with Reference Data Codewords ===\n";
$rs = new ReedSolomonEncoder();
$ecCodewords = 10;

$referenceEC = $rs->encode($referenceDataCodewords, $ecCodewords);
echo "EC codewords (from reference data): " . implode(', ', $referenceEC) . "\n\n";

// Test RS encoding with our data codewords
$ourEC = $rs->encode($ourDataCodewords, $ecCodewords);
echo "EC codewords (from our data): " . implode(', ', $ourEC) . "\n\n";

// Verify both with decoder
require_once __DIR__ . '/test-reed-solomon-decoder.php';
$decoder = new SimpleRSDecoder();

// Test reference
$fullReference = array_merge($referenceDataCodewords, $referenceEC);
$syndromesRef = $decoder->calculateSyndromes($fullReference, $ecCodewords);
echo "Reference syndromes: " . implode(', ', $syndromesRef) . "\n";
$allZeroRef = true;
foreach ($syndromesRef as $s) {
    if ($s !== 0) {
        $allZeroRef = false;
        break;
    }
}
echo ($allZeroRef ? "✅" : "❌") . " Reference codewords are " . ($allZeroRef ? "valid" : "invalid") . "\n\n";

// Test ours
$fullOurs = array_merge($ourDataCodewords, $ourEC);
$syndromesOurs = $decoder->calculateSyndromes($fullOurs, $ecCodewords);
echo "Our syndromes: " . implode(', ', $syndromesOurs) . "\n";
$allZeroOurs = true;
foreach ($syndromesOurs as $s) {
    if ($s !== 0) {
        $allZeroOurs = false;
        break;
    }
}
echo ($allZeroOurs ? "✅" : "❌") . " Our codewords are " . ($allZeroOurs ? "valid" : "invalid") . "\n\n";

// Now try to find expected EC codewords from known sources
echo "=== Finding Expected EC Codewords ===\n";
echo "If we can find a working QR code generator or reference implementation,\n";
echo "we can compare our EC codewords with the expected ones.\n\n";

// Known EC codewords from QR code specification for "HELLO WORLD"
// These are from the ISO/IEC 18004 specification example
// But we need to verify if our data codewords match first

// The issue is: our data codewords don't match the reference!
// This means the problem is in the encoding step, not Reed-Solomon.
// But let's still test if RS works correctly with correct input.