/**
 * Tamil Nadu TRB Auto Fetch + PDF Reader
 * Version: PRO+ Tamil UI + Cache + Responsive Cards + New Badge + Filter UI
 */

use Smalot\PdfParser\Parser;

if (!defined('ABSPATH')) exit;

function thedal_fetch_trb_jobs_cached() {

    $cache_key = 'thedal_trb_jobs_cache';
    $cached = get_transient($cache_key);
    if ($cached) return $cached;

    $url = "https://www.trb.tn.gov.in/notification.php?language=LG-1&status=Active";
    $html = @file_get_contents($url);
    if (!$html) return "<p>⚠️ TRB இணையதளத்துடன் இணைக்க முடியவில்லை.</p>";

    libxml_use_internal_errors(true);
    $dom = new DOMDocument();
    @$dom->loadHTML($html);
    $xpath = new DOMXPath($dom);
    $rows = $xpath->query("//table//tr");

    $output = "<div class='trb-job-list'>";

    foreach ($rows as $index => $row) {
        if ($index === 0) continue;

        $cols = $row->getElementsByTagName("td");
        if ($cols->length < 3) continue;

        $title = trim($cols->item(1)->textContent);
        $date = trim($cols->item(2)->textContent);
        $pdfLink = $cols->item(1)->getElementsByTagName("a")->item(0);
        $href = $pdfLink ? $pdfLink->getAttribute("href") : "#";
        if (strpos($href, 'http') !== 0) $href = "https://www.trb.tn.gov.in/" . ltrim($href, '/');

        $is_new = (time() - strtotime($date) < 5 * DAY_IN_SECONDS) ? " <span class='new-badge'>🆕 New</span>" : "";

        // --- PDF Content Extraction ---
        $pdfSummary = "<p><em>🔍 அறிவிப்பு உள்ளடக்கம் வாசிக்கப்படுகிறது...</em></p>";
        $tempFile = sys_get_temp_dir() . "/trb_temp.pdf";

        if (@file_put_contents($tempFile, @file_get_contents($href))) {
            try {
                $parser = new Parser();
                $pdf = $parser->parseFile($tempFile);
                $text = mb_strtolower($pdf->getText(), 'UTF-8');

                preg_match('/(\d+)\s+vacanc/i', $text, $vac);
                preg_match('/qualification[s]?:?\s*(.*)/i', $text, $qual);
                preg_match('/last\s*date[:\-]?\s*(.*?)\n/i', $text, $last);
                preg_match('/அணுகல்\s*தேதி[:\-]?\s*(.*?)\n/u', $text, $t_last);

                $pdfSummary = "<ul class='trb-summary'>";
                if (!empty($vac[1])) $pdfSummary .= "<li>👥 <strong>வெற்றிடங்கள்:</strong> {$vac[1]}</li>";
                if (!empty($qual[1])) $pdfSummary .= "<li>🎓 <strong>கல்வித்தகுதி:</strong> " . esc_html(substr($qual[1], 0, 100)) . "...</li>";
                if (!empty($last[1]) || !empty($t_last[1])) {
                    $last_date = !empty($last[1]) ? $last[1] : $t_last[1];
                    $pdfSummary .= "<li>⏰ <strong>கடைசி தேதி:</strong> " . esc_html(trim($last_date)) . "</li>";
                }
                $pdfSummary .= "</ul>";

            } catch (Exception $e) {
                $pdfSummary = "<p><em>PDF உள்ளடக்கம் படிக்க முடியவில்லை.</em></p>";
            }
        }

        $output .= "
        <div class='trb-job-card'>
            <h3>📘 {$title}{$is_new}</h3>
            <p><strong>📅 வெளியிடப்பட்ட தேதி:</strong> {$date}</p>
            {$pdfSummary}
            <a class='trb-btn' href='{$href}' target='_blank'>📄 அறிவிப்பு பார்க்க (PDF)</a>
        </div>";
    }

    $output .= "</div>";

    set_transient($cache_key, $output, 6 * HOUR_IN_SECONDS);
    return $output;
}
add_shortcode('trb_jobs', 'thedal_fetch_trb_jobs_cached');

// 🔎 Filter UI
function trb_jobs_filter_ui() {
    return '<div class="trb-filters">
        <a href="?trb_filter=all">All</a>
        <a href="?trb_filter=teaching">Teaching</a>
        <a href="?trb_filter=engineering">Engineering</a>
        <a href="?trb_filter=pdf">PDF Only</a>
    </div>';
}
add_shortcode('trb_jobs_filter', 'trb_jobs_filter_ui');

// 🎨 Custom CSS
function trb_custom_css() { ?>
    <style>
        .trb-job-list { display:grid; grid-template-columns:1fr; gap:20px; }
        @media(min-width:768px){ .trb-job-list{ grid-template-columns:repeat(2,1fr); } }
        @media(min-width:1024px){ .trb-job-list{ grid-template-columns:repeat(3,1fr); } }
        .trb-job-card { padding:15px; background:#fff; border:1px solid #ddd; border-radius:6px; transition:.3s; }
        .trb-job-card:hover { transform:translateY(-4px); }
        .trb-summary li { font-size:14px; margin-bottom:4px; }
        .new-badge { background:#ff9800; padding:2px 6px; border-radius:4px; font-size:12px; color:white; }
        .trb-btn { display:inline-block; margin-top:8px; background:#0073aa; padding:6px 12px; color:white; border-radius:4px; text-decoration:none; }
        .trb-btn:hover { background:#005177; }
        .trb-filters a { padding:6px 12px; border-radius:6px; background:#f3f3f3; margin-right:6px; text-decoration:none; }
        .trb-filters a:hover { background:#ddd; }
    </style>

add_action('wp_head', 'trb_custom_css');