<?php

if ($argc < 4) {
    echo "Usage: php compare.php a.txt b.txt c.txt\r\n";
    exit(1);
}

$fileA = $argv[1];
$fileB = $argv[2];
$fileC = $argv[3];

function readFileWithBom($filename, &$hasBom) {
    $content = file_get_contents($filename);

    if ($content === false) {
        echo "Error reading file: $filename\n";
        exit(1);
    }

    $bom = "\xEF\xBB\xBF";

    if (strncmp($content, $bom, 3) === 0) {
        $hasBom = true;
        $content = substr($content, 3);
    } else {
        $hasBom = false;
    }

    return $content;
}

function parseString($content) {
    $data = [];

    // robust gegen alle Line-Endings
    $lines = preg_split("/\r\n|\n|\r/", $content);

    if ($lines === false) {
        echo "Error splitting lines\n";
        exit(1);
    }

    foreach ($lines as $line) {
        if ($line === '') continue;

        // Sicherheit: BOM am Zeilenanfang entfernen
        if (strncmp($line, "\xEF\xBB\xBF", 3) === 0) {
            $line = substr($line, 3);
        }

        if (preg_match('/^\[(.*?)\]\s*(.*)$/u', $line, $matches)) {
            $key = $matches[1];
            $value = $matches[2];
            $data[$key] = $value;
        }
    }

    return $data;
}

function normalize($value) {
    //return str_replace('#', '', $value);
    return $value;
}

// Dateien lesen
$contentA = readFileWithBom($fileA, $bomA);
$contentB = readFileWithBom($fileB, $bomB);

$a = parseString($contentA);
$b = parseString($contentB);

$outputLines = [];

// Sortieren + Vergleich
foreach ($a as $key => $valueA) {
    $foundKey = array_find_key_slash_insensitive($key, $b);

    if ($foundKey === null) {
        echo "[MISSING in B] [$key]\r\n";
        continue;
    }

    $valueB = $b[$foundKey];
    $outputLines[] = "[$foundKey] $valueB";

    if (normalize($valueA) !== normalize($valueB)) {
        echo "[DIFF] [$key]\r\n";
        echo "  A: $valueA\r\n";
        echo "  B: $valueB\r\n";
    }
}

// Extras aus B ans Ende
foreach ($b as $key => $valueB) {
    if (array_find_key_slash_insensitive($key, $a) === null) {
        echo "[EXTRA in B] [$key]\r\n";
        $outputLines[] = "[$key] $valueB";
    }
}

// Datei schreiben
$output = implode(PHP_EOL, $outputLines) . PHP_EOL;

if ($bomB) {
    $output = "\xEF\xBB\xBF" . $output;
}

file_put_contents($fileC, $output);

# ---

function array_find_key_slash_insensitive($key, array $array)
{
    $normalize = fn($str) => str_replace('／', '/', $str);
    $normalizedKey = $normalize($key);

    foreach ($array as $k => $_) {
        if ($normalize($k) === $normalizedKey) {
            return $k; // ← echter Key!
        }
    }

    return null;
}