<?php
// OPUS5 count_pattern - autonomous grep endpoint for WEVIA
header('Content-Type: application/json');
$pattern = $_GET['p'] ?? $_POST['pattern'] ?? '';
$dir = $_GET['d'] ?? '/var/www/html,/opt/wevia-brain';
$ext = $_GET['ext'] ?? 'html,php,json';

if (empty($pattern) || !preg_match('/^[a-zA-Z0-9_\-\.\/]{1,40}$/', $pattern)) {
    echo json_encode(['error'=>'pattern required, alphanum+_-./max40']);
    exit;
}

$dirs = explode(',', $dir);
$exts = explode(',', $ext);
$results = ['pattern'=>$pattern, 'matches'=>[], 'total_files'=>0, 'total_occurrences'=>0];

foreach ($dirs as $d) {
    $d = trim($d);
    if (!is_dir($d)) continue;
    foreach ($exts as $e) {
        $cmd = "timeout 5 grep -rc " . escapeshellarg($pattern) . " " . escapeshellarg($d) . " --include='*." . escapeshellarg(trim($e)) . "' 2>/dev/null";
        $out = @shell_exec($cmd);
        if (!$out) continue;
        foreach (explode("\n", trim($out)) as $line) {
            if (!trim($line)) continue;
            if (!preg_match('/^(.+):(\d+)$/', $line, $m)) continue;
            $count = (int)$m[2];
            if ($count === 0) continue;
            $results['matches'][] = ['file' => $m[1], 'count' => $count];
            $results['total_files']++;
            $results['total_occurrences'] += $count;
        }
    }
}
echo json_encode($results, JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES);