
<?php
header('Content-Type: application/json');
$pdo = new PDO("pgsql:host=localhost;dbname=adx_system", "admin", "admin123");

class SubjectTester {
    private $spamWords = ['free','winner','click here','act now','limited time','urgent','congratulations','cash','prize','100%','guarantee','no obligation','risk free','order now','buy now','cheap','earn money','make money','work from home','double your','increase your','lose weight','viagra','cialis','pharmacy'];
    
    public function analyze($subject) {
        $result = ['subject' => $subject, 'score' => 100, 'issues' => [], 'suggestions' => []];
        $lower = strtolower($subject);
        
        // Check spam words
        foreach ($this->spamWords as $word) {
            if (strpos($lower, $word) !== false) {
                $result['score'] -= 10;
                $result['issues'][] = "Contains spam trigger: '$word'";
            }
        }
        
        // Check length
        $len = strlen($subject);
        if ($len > 60) {
            $result['score'] -= 10;
            $result['issues'][] = "Too long ($len chars). Keep under 60.";
        } elseif ($len < 20) {
            $result['score'] -= 5;
            $result['issues'][] = "Too short ($len chars). Aim for 30-50.";
        }
        
        // Check caps
        $caps = preg_match_all('/[A-Z]/', $subject, $m);
        $capsRatio = $caps / max(1, $len);
        if ($capsRatio > 0.3) {
            $result['score'] -= 15;
            $result['issues'][] = "Too many capital letters";
        }
        
        // Check special chars
        if (preg_match('/[!]{2,}|[$]{2,}|[?]{2,}/', $subject)) {
            $result['score'] -= 10;
            $result['issues'][] = "Excessive punctuation";
        }
        
        // Check emojis (sometimes good, sometimes bad)
        if (preg_match('/[\x{1F600}-\x{1F6FF}]/u', $subject)) {
            $result['suggestions'][] = "Contains emoji - test with and without";
        }
        
        $result['score'] = max(0, $result['score']);
        $result['rating'] = $result['score'] >= 80 ? 'good' : ($result['score'] >= 50 ? 'moderate' : 'poor');
        
        return $result;
    }
    
    public function encode($subject) {
        return '=?UTF-8?B?' . base64_encode($subject) . '?=';
    }
}

$action = $_GET['action'] ?? $_POST['action'] ?? '';
$tester = new SubjectTester();

switch ($action) {
    case 'analyze':
        echo json_encode($tester->analyze($_POST['subject'] ?? $_GET['subject']));
        break;
    case 'encode':
        $subject = $_POST['subject'] ?? $_GET['subject'];
        echo json_encode(['original' => $subject, 'encoded' => $tester->encode($subject)]);
        break;
    case 'bulk':
        $subjects = explode("\n", $_POST['subjects'] ?? '');
        $results = [];
        foreach ($subjects as $s) {
            if (trim($s)) $results[] = $tester->analyze(trim($s));
        }
        echo json_encode(['results' => $results]);
        break;
    default:
        echo json_encode(['actions' => ['analyze', 'encode', 'bulk']]);
}