<?php

declare(strict_types=1);

$root = __DIR__ . '/../sdlc';
$english = [
    'January'=>'01','February'=>'02','March'=>'03','April'=>'04','May'=>'05','June'=>'06',
    'July'=>'07','August'=>'08','September'=>'09','October'=>'10','November'=>'11','December'=>'12',
    'Jan'=>'01','Feb'=>'02','Mar'=>'03','Apr'=>'04','Jun'=>'06','Jul'=>'07','Aug'=>'08','Sep'=>'09','Oct'=>'10','Nov'=>'11','Dec'=>'12',
];
$thai = ['มกราคม'=>'01','กุมภาพันธ์'=>'02','มีนาคม'=>'03','เมษายน'=>'04','พฤษภาคม'=>'05','มิถุนายน'=>'06','กรกฎาคม'=>'07','สิงหาคม'=>'08','กันยายน'=>'09','ตุลาคม'=>'10','พฤศจิกายน'=>'11','ธันวาคม'=>'12'];

function normalDate(int|string $day, string $month, int|string $year, array $english, array $thai): string
{
    $monthNo = $english[$month] ?? $thai[$month] ?? null;
    if ($monthNo === null) return (string)$day . ' ' . $month . ' ' . (string)$year;
    $yearNo = (int)$year;
    if ($yearNo >= 2400) $yearNo -= 543;
    return sprintf('%02d/%s/%02d', (int)$day, $monthNo, $yearNo % 100);
}

function normalizeDates(string $text, array $english, array $thai): string
{
    $months = implode('|', array_map(static fn($v) => preg_quote($v, '/'), array_keys($english + $thai)));

    // Compact Buddhist document/report dates, e.g. 25690817.
    $text = preg_replace_callback('/\b(25\d{2})(\d{2})(\d{2})\b/', static function ($m) {
        return sprintf('%02d/%02d/%02d', (int)$m[3], (int)$m[2], ((int)$m[1] - 543) % 100);
    }, $text) ?? $text;

    // Shared-month range: 11–13 May 2026.
    $text = preg_replace_callback('/\b(\d{1,2})\s*[–-]\s*(\d{1,2})\s+('.$months.')\s+(20\d{2}|25\d{2})\b/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[3],$m[4],$english,$thai).'–'.normalDate($m[2],$m[3],$m[4],$english,$thai);
    }, $text) ?? $text;

    // Two-month range with a shared year: 5 January–14 August 2026.
    $text = preg_replace_callback('/\b(\d{1,2})\s+('.$months.')\s*[–-]\s*(\d{1,2})\s+('.$months.')\s+(20\d{2}|25\d{2})\b/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[2],$m[5],$english,$thai).'–'.normalDate($m[3],$m[4],$m[5],$english,$thai);
    }, $text) ?? $text;

    // Hyphenated two-month range: 19-Feb–29-May-2026.
    $text = preg_replace_callback('/\b(\d{1,2})-('.$months.')\s*[–-]\s*(\d{1,2})-('.$months.')-(20\d{2}|25\d{2})\b/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[2],$m[5],$english,$thai).'–'.normalDate($m[3],$m[4],$m[5],$english,$thai);
    }, $text) ?? $text;

    // A full single date using a month name or abbreviation.
    $text = preg_replace_callback('/\b(\d{1,2})(?:-|\s+)('.$months.')(?:-|\s+)(20\d{2}|25\d{2})\b/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[2],$m[3],$english,$thai);
    }, $text) ?? $text;

    // Period descriptions without a repeated year, all known to be in 2026.
    $text = preg_replace_callback('/\b(\d{1,2})\s*[–-]\s*(\d{1,2})\s+('.$months.')(?=\s+(?:commits|accounting|May|April|January|February|March|June|July|August))/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[3],2026,$english,$thai).'–'.normalDate($m[2],$m[3],2026,$english,$thai);
    }, $text) ?? $text;

    // Commit-period shorthand: 30-Apr through 08-May.
    $text = preg_replace_callback('/\b(\d{1,2})-('.$months.')\s+through\s+(\d{1,2})-('.$months.')\b/u', static function ($m) use ($english,$thai) {
        return normalDate($m[1],$m[2],2026,$english,$thai).'–'.normalDate($m[3],$m[4],2026,$english,$thai);
    }, $text) ?? $text;

    return $text;
}

$iterator = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($root, FilesystemIterator::SKIP_DOTS));
$updated = 0;
foreach ($iterator as $file) {
    if (!$file->isFile() || !str_starts_with($file->getFilename(), '200-WMS-')) continue;
    $path = $file->getPathname();
    $extension = strtolower($file->getExtension());
    if ($extension === 'md') {
        $before = file_get_contents($path);
        if ($before === false) continue;
        $after = normalizeDates($before, $english, $thai);
        if ($after !== $before) {
            file_put_contents($path, $after);
            $updated++;
        }
        continue;
    }
    if (!in_array($extension, ['docx','xlsx'], true)) continue;
    $zip = new ZipArchive();
    if ($zip->open($path) !== true) continue;
    $changed = false;
    for ($i=0; $i<$zip->numFiles; $i++) {
        $name = $zip->getNameIndex($i);
        if (!str_ends_with($name, '.xml')) continue;
        $before = $zip->getFromIndex($i);
        $after = normalizeDates($before, $english, $thai);
        if ($after === $before) continue;
        $dom = new DOMDocument();
        if (!$dom->loadXML($after)) throw new RuntimeException("Invalid XML after date conversion: {$path}::{$name}");
        $zip->addFromString($name, $after);
        $changed = true;
    }
    $zip->close();
    if ($changed) $updated++;
}

echo "Updated {$updated} BRN WMS document(s).\n";