<?php

echo "=== Format Information Comparison ===\n\n";

// Our implementation
$ourFormatH = "101111001111100";
$ourFormatV = "101111001111100";

// Python reference
$pythonFormatH = "101010000100100";
$pythonFormatV = "101010000010010";

echo "Our Implementation:\n";
echo "  Horizontal: {$ourFormatH}\n";
echo "  Vertical:   {$ourFormatV}\n";
echo "  Match: " . ($ourFormatH === $ourFormatV ? "✅" : "❌") . "\n\n";

echo "Python Reference:\n";
echo "  Horizontal: {$pythonFormatH}\n";
echo "  Vertical:   {$pythonFormatV}\n";
echo "  Match: " . ($pythonFormatH === $pythonFormatV ? "✅" : "❌") . "\n\n";

// Decode both
$xorMask = "101010000010010";

echo "Decoding Our Format Info:\n";
$ourUnmasked = '';
for ($i = 0; $i < 15; $i++) {
    $ourUnmasked .= (int)$ourFormatH[$i] ^ (int)$xorMask[$i];
}
echo "  Unmasked: {$ourUnmasked}\n";
echo "  EC: " . substr($ourUnmasked, 0, 2) . " = " . match(substr($ourUnmasked, 0, 2)) {
    '01' => 'L',
    '00' => 'M',
    '11' => 'Q',
    '10' => 'H'
} . "\n";
echo "  Mask: " . substr($ourUnmasked, 2, 3) . " = Pattern " . bindec(substr($ourUnmasked, 2, 3)) . "\n\n";

echo "Decoding Python Format Info:\n";
$pythonUnmasked = '';
for ($i = 0; $i < 15; $i++) {
    $pythonUnmasked .= (int)$pythonFormatH[$i] ^ (int)$xorMask[$i];
}
echo "  Unmasked: {$pythonUnmasked}\n";
echo "  EC: " . substr($pythonUnmasked, 0, 2) . " = " . match(substr($pythonUnmasked, 0, 2)) {
    '01' => 'L',
    '00' => 'M',
    '11' => 'Q',
    '10' => 'H'
} . "\n";
echo "  Mask: " . substr($pythonUnmasked, 2, 3) . " = Pattern " . bindec(substr($pythonUnmasked, 2, 3)) . "\n\n";

echo "=== Conclusion ===\n";
echo "Our implementation uses Mask Pattern 2\n";
echo "Python reference uses Mask Pattern 0\n";
echo "This explains the data differences!\n";