<?php
function sanitize_email($email) {
    return filter_var(trim($email), FILTER_SANITIZE_EMAIL);
}

function validate_email($email) {
    return filter_var($email, FILTER_VALIDATE_EMAIL);
}

function sanitize_text($text) {
    return trim(strip_tags($text));
}

function generate_random_string_long() {
    // Generate long random string like: E168CG5FkRWtC4GHbWc3taszj8bDq8hFLpOUsgYoGKj7hcnn5HY3_GaoSr1SBrwNtQotiXnW5csIg3LS48ch3TKM0gIpbdgsYo6Vr5EMg3sx4vvUKw6g2oPl6E3527FoH3bnhjMLR1
    $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_';
    $length = rand(120, 140);
    $result = '';
    for ($i = 0; $i < $length; $i++) {
        $result .= $chars[rand(0, strlen($chars) - 1)];
    }
    return $result;
}

function generate_random_string_medium() {
    // Generate medium random string like: hzch5ysWVb9Ao4RszGNlNqqnvpVhi4tl
    $chars = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $length = 32;
    $result = '';
    for ($i = 0; $i < $length; $i++) {
        $result .= $chars[rand(0, strlen($chars) - 1)];
    }
    return $result;
}

function generate_random_address() {
    $cities = [
        "Springfield", "Greenville", "Fairview", "Bristol", "Salem", 
        "Chester", "Franklin", "Madison", "Centerville", "Riverside", 
        "Lincoln", "Clinton", "Georgetown", "Winchester", "Lexington", 
        "Arlington", "Hudson", "Newton", "Cambridge", "Harrison", 
        "Kingston", "Westfield", "Richmond", "Mount Vernon", "Hillsboro", 
        "Lakewood", "Manchester", "Clearwater", "Fairmont", "Wilmington"
    ];
    
    $street_names = [
        "Elm St.", "Maple St.", "Oak St.", "Pine St.", "Cedar St.", 
        "1st Ave.", "2nd Ave.", "3rd Ave.", "4th Ave.", "5th Ave.", 
        "6th Ave.", "7th Ave.", "8th Ave.", "Birch St.", "Ash St.", 
        "Cherry St.", "Walnut St.", "Poplar St.", "Willow St.", "Sycamore St.", 
        "Main St.", "Broadway", "River Rd.", "Highland Blvd.", "Sunset Blvd.", 
        "Washington St.", "Adams St.", "Jefferson St.", "Lincoln Ave.", "Jackson St.", 
        "Roosevelt Ave.", "Kennedy Blvd.", "Grant St.", "Madison St.", "Franklin Blvd."
    ];
    
    $states = [
        ["AL", "Alabama"], ["AK", "Alaska"], ["AZ", "Arizona"], ["AR", "Arkansas"], ["CA", "California"],
        ["CO", "Colorado"], ["CT", "Connecticut"], ["DE", "Delaware"], ["FL", "Florida"], ["GA", "Georgia"],
        ["HI", "Hawaii"], ["ID", "Idaho"], ["IL", "Illinois"], ["IN", "Indiana"], ["IA", "Iowa"],
        ["KS", "Kansas"], ["KY", "Kentucky"], ["LA", "Louisiana"], ["ME", "Maine"], ["MD", "Maryland"],
        ["MA", "Massachusetts"], ["MI", "Michigan"], ["MN", "Minnesota"], ["MS", "Mississippi"], ["MO", "Missouri"],
        ["MT", "Montana"], ["NE", "Nebraska"], ["NV", "Nevada"], ["NH", "New Hampshire"], ["NJ", "New Jersey"],
        ["NM", "New Mexico"], ["NY", "New York"], ["NC", "North Carolina"], ["ND", "North Dakota"], ["OH", "Ohio"],
        ["OK", "Oklahoma"], ["OR", "Oregon"], ["PA", "Pennsylvania"], ["RI", "Rhode Island"], ["SC", "South Carolina"],
        ["SD", "South Dakota"], ["TN", "Tennessee"], ["TX", "Texas"], ["UT", "Utah"], ["VT", "Vermont"],
        ["VA", "Virginia"], ["WA", "Washington"], ["WV", "West Virginia"], ["WI", "Wisconsin"], ["WY", "Wyoming"]
    ];
    
    $street_number = rand(1, 9999);
    $street_name = $street_names[array_rand($street_names)];
    $city = $cities[array_rand($cities)];
    $state = $states[array_rand($states)];
    $zip = rand(10000, 99999);
    
    return "$street_number $street_name, $city, {$state[0]} $zip";
}

function get_random_user() {
    // Try to fetch from API, fallback to local generation if fails
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, "https://randomuser.me/api/");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_TIMEOUT, 5);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    
    $response = curl_exec($ch);
    $error = curl_error($ch);
    curl_close($ch);
    
    if ($response && !$error) {
        $data = json_decode($response, true);
        if (isset($data['results'][0]['name'])) {
            $name = $data['results'][0]['name'];
            return $name['first'] . ' ' . $name['last'];
        }
    }
    
    // Fallback: generate random name locally
    $first_names = ["James", "Mary", "John", "Patricia", "Robert", "Jennifer", "Michael", "Linda", "William", "Elizabeth", 
                    "David", "Barbara", "Richard", "Susan", "Joseph", "Jessica", "Thomas", "Sarah", "Charles", "Karen",
                    "Christopher", "Nancy", "Daniel", "Lisa", "Matthew", "Betty", "Anthony", "Margaret", "Mark", "Sandra"];
    $last_names = ["Smith", "Johnson", "Williams", "Brown", "Jones", "Garcia", "Miller", "Davis", "Rodriguez", "Martinez",
                   "Hernandez", "Lopez", "Gonzalez", "Wilson", "Anderson", "Thomas", "Taylor", "Moore", "Jackson", "Martin",
                   "Lee", "Perez", "Thompson", "White", "Harris", "Sanchez", "Clark", "Ramirez", "Lewis", "Robinson"];
    
    return $first_names[array_rand($first_names)] . ' ' . $last_names[array_rand($last_names)];
}

function apply_placeholders($text, $email, $linksList, $keywordsList, $senderName) {
    $emailUser = explode('@', $email)[0];
    
    // Extract domain from recipient email
    $emailParts = explode('@', $email);
    $emailDomain = isset($emailParts[1]) ? $emailParts[1] : '';
    
    // Generate random values for this specific email
    $randomMd5 = md5(uniqid(mt_rand(), true));
    $randomLink = !empty($linksList) ? $linksList[array_rand($linksList)] : '';
    $randomKeyword = !empty($keywordsList) ? $keywordsList[array_rand($keywordsList)] : 'default';
    $randomNumber = rand(99999, 999999); // Random number between 99999-999999
    $randomStringLong = generate_random_string_long();
    $randomStringMedium = generate_random_string_medium();
    $randomAddress = generate_random_address();
    $randomUser = get_random_user();
    
    $placeholders = [
        '[-email-]' => $email,
        '[-emailuser-]' => $emailUser,
        '[-time-]' => date('m/d/Y h:i:s a'),
        '[-randomstring-]' => substr(str_shuffle(str_repeat('0123456789abcdefghijklmnopqrstuvwxyz', 10)), 0, 10),
        '[-randomnumber-]' => rand(0, 9),
        '[-randomletters-]' => substr(str_shuffle(str_repeat('abcdefghijklmnopqrstuvwxyz', 5)), 0, 5),
        '[-randommd5-]' => md5(uniqid(mt_rand(), true)),
        '[-sendername-]' => $senderName,
        '%%link%%' => $randomLink,
        '%%random_max%%' => $randomNumber,
        '%%key%%' => $randomKeyword,
        '%%random_2%%' => $randomStringLong,
        '%%random_3%%' => $randomStringMedium,
        '%%address%%' => $randomAddress,
        '%%user%%' => $randomUser,
        '%%domain%%' => $emailDomain
    ];
    
    $text = str_ireplace(array_keys($placeholders), array_values($placeholders), $text);
    
    // Add id attribute alongside existing class attributes
    $text = preg_replace_callback(
        '/class\s*=\s*["\']([^"\']+)["\']/i',
        function($matches) use ($randomKeyword, $randomMd5) {
            $classValue = $matches[1];
            return 'id="' . $randomKeyword . '---' . $randomMd5 . '" class="' . $classValue . '"';
        },
        $text
    );
    
    return $text;
}

// Handle keyword file upload
if (isset($_POST['load_keywords']) && isset($_FILES['keywords_file'])) {
    if ($_FILES['keywords_file']['error'] == 0) {
        $content = file_get_contents($_FILES['keywords_file']['tmp_name']);
        echo json_encode(['success' => true, 'content' => $content]);
    } else {
        echo json_encode(['success' => false, 'message' => 'Error uploading file']);
    }
    exit;
}

// Handle preview request
if (isset($_POST['preview'])) {
    $body = $_POST['body'] ?? '';
    $linksList = array_filter(array_map('trim', explode("\n", $_POST['links_list'] ?? '')));
    $keywordsList = array_filter(array_map('trim', explode("\n", $_POST['keywords_list'] ?? '')));
    $senderNames = array_filter(array_map('trim', explode("\n", $_POST['sender_names'] ?? '')));
    $senderName = !empty($senderNames) ? $senderNames[array_rand($senderNames)] : 'Sender';
    
    $previewEmail = 'preview@example.com';
    $previewHtml = apply_placeholders($body, $previewEmail, $linksList, $keywordsList, $senderName);
    
    echo json_encode(['success' => true, 'html' => $previewHtml]);
    exit;
}

if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    // Check if it's a single email send request
    if (isset($_POST['send_single_email'])) {
        $fromEmail = sanitize_email($_POST['from_email'] ?? '');
        $replyTo = sanitize_email($_POST['reply_to'] ?? '');
        $subject = sanitize_text($_POST['subject'] ?? '');
        $body = $_POST['body'] ?? '';
        $emailFormat = ($_POST['format'] ?? 'text') === 'html' ? 'html' : 'plain';
        $priority = in_array($_POST['priority'] ?? '3', ['1','3','5']) ? $_POST['priority'] : '3';
        $charset = ($_POST['charset'] ?? 'UTF-8') === 'ISO-8859-1' ? 'ISO-8859-1' : 'UTF-8';
        $confirmReading = ($_POST['confirm_reading'] ?? '') === 'true';

        // Parse sender names list
        $senderNamesRaw = $_POST['sender_names'] ?? '';
        $senderNamesList = array_filter(array_map('trim', explode("\n", $senderNamesRaw)));
        
        // Parse links list
        $linksRaw = $_POST['links_list'] ?? '';
        $linksList = array_filter(array_map('trim', explode("\n", $linksRaw)));
        
        // Parse keywords list
        $keywordsRaw = $_POST['keywords_list'] ?? '';
        $keywordsList = array_filter(array_map('trim', explode("\n", $keywordsRaw)));

        // Get single recipient email
        $to = sanitize_email($_POST['recipient_email'] ?? '');

        if (!$fromEmail || !validate_email($fromEmail)) {
            echo json_encode(['success' => false, 'message' => 'Invalid sender email.']);
            exit;
        }

        if (!$to || !validate_email($to)) {
            echo json_encode(['success' => false, 'message' => 'Invalid recipient email: ' . $to]);
            exit;
        }

        // Get random sender name for this email
        $yourName = !empty($senderNamesList) ? $senderNamesList[array_rand($senderNamesList)] : 'Sender';

        $headers = [];
        $headers[] = "MIME-Version: 1.0";
        $headers[] = "From: " . addcslashes($yourName, "\r\n") . " <$fromEmail>";
        if (!empty($replyTo) && validate_email($replyTo)) {
            $headers[] = "Reply-To: $replyTo";
        }
        if ($confirmReading) {
            $headers[] = "Disposition-Notification-To: $fromEmail";
        }
        $headers[] = "X-Priority: $priority";

        // Apply placeholders with random link, keyword, and sender name for THIS specific email
        $parsedSubject = apply_placeholders($subject, $to, $linksList, $keywordsList, $yourName);
        $parsedBody = apply_placeholders($body, $to, $linksList, $keywordsList, $yourName);

        $headers[] = "Content-Type: text/$emailFormat; charset=$charset";
        $message = $parsedBody;

        $headers_str = implode("\r\n", $headers);

        $success = mail($to, $parsedSubject, $message, $headers_str, "-f$fromEmail");
        
        if ($success) {
            echo json_encode([
                'success' => true, 
                'message' => 'Email sent successfully',
                'email' => $to,
                'sender' => $yourName
            ]);
        } else {
            echo json_encode([
                'success' => false, 
                'message' => 'Failed to send email',
                'email' => $to
            ]);
        }
        exit;
    }
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Professional PHP Mailer Pro - GDPR Compliant</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #0f172a;
            min-height: 100vh;
            padding: 20px;
            color: #e2e8f0;
        }
        
        .main-container {
            max-width: 1600px;
            margin: 0 auto;
        }
        
        .header {
            text-align: center;
            margin-bottom: 40px;
            padding: 30px;
            background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
            border-radius: 20px;
            border: 1px solid #334155;
            box-shadow: 0 20px 60px rgba(0,0,0,0.5);
        }
        
        .header h1 {
            font-size: 3em;
            margin-bottom: 10px;
            background: linear-gradient(135deg, #3b82f6, #8b5cf6, #ec4899);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            font-weight: 800;
        }
        
        .header p {
            font-size: 1.2em;
            color: #94a3b8;
            font-weight: 300;
        }
        
        .content-wrapper {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 25px;
            align-items: start;
        }
        
        .form-container, .preview-container {
            background: #1e293b;
            border-radius: 20px;
            padding: 35px;
            border: 1px solid #334155;
            box-shadow: 0 10px 40px rgba(0,0,0,0.4);
        }
        
        .form-container h2, .preview-container h2 {
            color: #f1f5f9;
            margin-bottom: 25px;
            font-size: 1.9em;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 12px;
            padding-bottom: 15px;
            border-bottom: 2px solid #334155;
        }
        
        .info-banner {
            background: linear-gradient(135deg, #1e3a8a 0%, #7c3aed 100%);
            color: white;
            padding: 25px;
            border-radius: 15px;
            margin-bottom: 30px;
            border: 1px solid rgba(255,255,255,0.1);
            box-shadow: 0 8px 32px rgba(59, 130, 246, 0.3);
        }
        
        .info-banner h3 {
            margin-bottom: 18px;
            font-size: 1.4em;
            font-weight: 700;
        }
        
        .info-banner .placeholder-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 12px;
            font-size: 0.88em;
        }
        
        .placeholder-item {
            background: rgba(255,255,255,0.15);
            padding: 10px 12px;
            border-radius: 8px;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.1);
            transition: all 0.3s ease;
        }
        
        .placeholder-item:hover {
            background: rgba(255,255,255,0.2);
            transform: translateY(-2px);
        }
        
        .placeholder-item code {
            background: rgba(0,0,0,0.3);
            padding: 3px 8px;
            border-radius: 4px;
            font-family: 'Fira Code', 'Courier New', monospace;
            font-weight: 600;
            color: #60a5fa;
        }
        
        .form-section {
            margin-bottom: 30px;
            padding: 25px;
            background: #0f172a;
            border-radius: 12px;
            border: 1px solid #334155;
        }
        
        .form-section h3 {
            color: #a78bfa;
            margin-bottom: 20px;
            font-size: 1.3em;
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 700;
        }
        
        .section-icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, #3b82f6, #8b5cf6);
            color: white;
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 16px;
            font-weight: bold;
            box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
        }
        
        label {
            display: block;
            margin-bottom: 10px;
            font-weight: 600;
            color: #cbd5e1;
            font-size: 0.95em;
        }
        
        label .required {
            color: #f87171;
        }
        
        input[type="email"], input[type="text"], textarea, select {
            width: 100%;
            padding: 14px;
            margin-bottom: 15px;
            background: #0f172a;
            border: 2px solid #334155;
            border-radius: 10px;
            font-size: 14px;
            transition: all 0.3s ease;
            font-family: inherit;
            color: #e2e8f0;
        }
        
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #3b82f6;
            box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
            background: #1e293b;
        }
        
        textarea {
            resize: vertical;
            font-family: 'Fira Code', 'Courier New', monospace;
            line-height: 1.6;
        }
        
        ::placeholder {
            color: #475569;
        }
        
        .inline-group {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }
        
        .file-upload-wrapper {
            position: relative;
            margin-bottom: 15px;
        }
        
        .file-upload-btn {
            display: inline-block;
            padding: 12px 24px;
            background: linear-gradient(135deg, #8b5cf6, #7c3aed);
            color: white;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 600;
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.4);
        }
        
        .file-upload-btn:hover {
            background: linear-gradient(135deg, #7c3aed, #6d28d9);
            transform: translateY(-3px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.6);
        }
        
        input[type="file"] {
            display: none;
        }
        
        .checkbox-label {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-bottom: 15px;
            cursor: pointer;
            padding: 12px;
            background: #0f172a;
            border-radius: 8px;
            border: 1px solid #334155;
            transition: all 0.3s ease;
        }
        
        .checkbox-label:hover {
            background: #1e293b;
            border-color: #3b82f6;
        }
        
        input[type="checkbox"] {
            width: 22px;
            height: 22px;
            cursor: pointer;
            accent-color: #3b82f6;
        }
        
        .button-group {
            display: flex;
            gap: 15px;
            margin-top: 30px;
        }
        
        button {
            flex: 1;
            padding: 18px 35px;
            border: none;
            border-radius: 12px;
            font-size: 16px;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s ease;
            text-transform: uppercase;
            letter-spacing: 1.2px;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, #3b82f6, #8b5cf6);
            color: white;
            box-shadow: 0 8px 25px rgba(59, 130, 246, 0.4);
        }
        
        .btn-primary:hover:not(:disabled) {
            transform: translateY(-3px);
            box-shadow: 0 12px 35px rgba(59, 130, 246, 0.6);
            background: linear-gradient(135deg, #2563eb, #7c3aed);
        }
        
        .btn-secondary {
            background: linear-gradient(135deg, #475569, #334155);
            color: white;
            box-shadow: 0 4px 15px rgba(71, 85, 105, 0.4);
        }
        
        .btn-secondary:hover {
            background: linear-gradient(135deg, #334155, #1e293b);
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(71, 85, 105, 0.6);
        }
        
        button:disabled {
            opacity: 0.5;
            cursor: not-allowed;
            transform: none !important;
        }
        
        .progress-container {
            display: none;
            background: #0f172a;
            padding: 25px;
            border-radius: 15px;
            margin-top: 30px;
            border: 1px solid #334155;
        }
        
        .progress-container h3 {
            color: #a78bfa;
            margin-bottom: 20px;
            font-size: 1.4em;
            font-weight: 700;
        }
        
        .progress-bar {
            width: 100%;
            height: 45px;
            background: #0f172a;
            border-radius: 25px;
            overflow: hidden;
            position: relative;
            border: 2px solid #334155;
        }
        
        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, #3b82f6, #8b5cf6, #ec4899);
            width: 0%;
            transition: width 0.4s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 800;
            font-size: 17px;
            box-shadow: 0 0 20px rgba(59, 130, 246, 0.6);
        }
        
        .progress-info {
            margin-top: 18px;
            text-align: center;
            font-size: 15px;
            color: #94a3b8;
            font-weight: 500;
        }
        
        .results {
            margin-top: 25px;
            max-height: 350px;
            overflow-y: auto;
            border: 2px solid #334155;
            border-radius: 12px;
            padding: 18px;
            background: #1e293b;
        }
        
        .results::-webkit-scrollbar {
            width: 8px;
        }
        
        .results::-webkit-scrollbar-track {
            background: #0f172a;
            border-radius: 10px;
        }
        
        .results::-webkit-scrollbar-thumb {
            background: #3b82f6;
            border-radius: 10px;
        }
        
        .result-item {
            padding: 14px;
            margin: 10px 0;
            border-radius: 10px;
            font-size: 14px;
            animation: slideIn 0.4s ease;
            font-weight: 500;
        }
        
        @keyframes slideIn {
            from {
                opacity: 0;
                transform: translateX(-30px);
            }
            to {
                opacity: 1;
                transform: translateX(0);
            }
        }
        
        .result-success {
            background: rgba(16, 185, 129, 0.15);
            color: #34d399;
            border-left: 4px solid #10b981;
        }
        
        .result-error {
            background: rgba(239, 68, 68, 0.15);
            color: #f87171;
            border-left: 4px solid #ef4444;
        }
        
        .preview-container {
            position: sticky;
            top: 20px;
        }
        
        .preview-controls {
            margin-bottom: 20px;
        }
        
        .preview-frame {
            border: 2px solid #334155;
            border-radius: 12px;
            min-height: 500px;
            max-height: 700px;
            overflow: auto;
            padding: 25px;
            background: #0f172a;
        }
        
        .preview-frame::-webkit-scrollbar {
            width: 8px;
        }
        
        .preview-frame::-webkit-scrollbar-track {
            background: #1e293b;
            border-radius: 10px;
        }
        
        .preview-frame::-webkit-scrollbar-thumb {
            background: #3b82f6;
            border-radius: 10px;
        }
        
        .preview-empty {
            display: flex;
            align-items: center;
            justify-content: center;
            height: 500px;
            color: #475569;
            font-size: 1.3em;
            font-weight: 500;
        }
        
        .helper-text {
            font-size: 0.85em;
            color: #64748b;
            margin-top: 8px;
            font-style: italic;
        }
        
        .badge {
            display: inline-block;
            padding: 5px 10px;
            background: linear-gradient(135deg, #ec4899, #f43f5e);
            color: white;
            border-radius: 6px;
            font-size: 0.7em;
            font-weight: 700;
            margin-left: 10px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            box-shadow: 0 2px 8px rgba(236, 72, 153, 0.4);
        }
        
        @media (max-width: 1200px) {
            .content-wrapper {
                grid-template-columns: 1fr;
            }
            
            .preview-container {
                position: static;
            }
        }
        
        .instructions-box {
            background: linear-gradient(135deg, #1e3a8a 0%, #1e293b 100%);
            border-left: 4px solid #3b82f6;
            padding: 25px;
            margin-bottom: 30px;
            border-radius: 15px;
            border: 1px solid #334155;
        }
        
        .instructions-box h4 {
            color: #60a5fa;
            margin-bottom: 15px;
            font-size: 1.3em;
            font-weight: 700;
        }
        
        .instructions-box ul {
            margin-left: 25px;
            color: #94a3b8;
            line-height: 1.8;
        }
        
        .instructions-box li {
            margin: 8px 0;
        }
        
        .instructions-box strong {
            color: #a78bfa;
        }
    </style>
</head>
<body>
    <div class="main-container">
        <div class="header">
            <h1>?? Professional PHP Mailer Pro</h1>
            <p>GDPR Compliant � Advanced Email Marketing System</p>
        </div>
        
        <div class="instructions-box">
            <h4>?? How to Use This Mailer:</h4>
            <ul>
                <li><strong>Step 1:</strong> Fill in your email and sender information</li>
                <li><strong>Step 2:</strong> Add recipient emails (one per line) - can handle 10K+ emails!</li>
                <li><strong>Step 3:</strong> Add sender names (random name used for each email)</li>
                <li><strong>Step 4:</strong> Add links and keywords lists</li>
                <li><strong>Step 5:</strong> Configure sending speed (concurrent sends & delay)</li>
                <li><strong>Step 6:</strong> Use placeholders in your email body (see info box below)</li>
                <li><strong>Step 7:</strong> Click "Preview Email" to see how it looks</li>
                <li><strong>Step 8:</strong> Click "Send Emails" when ready - browser won't freeze!</li>
                <li><strong>Keywords File:</strong> Upload a keywords.txt file to auto-fill keywords list</li>
                <li><strong>Large Lists:</strong> For 10K emails: use 5-10 concurrent sends with 300ms delay for optimal speed</li>
                <li><strong>Domain Placeholder:</strong> %%domain%% will be replaced with recipient's email domain (gmail.com, inwi.ma, yahoo.com, etc.)</li>
            </ul>
        </div>
        
        <div class="content-wrapper">
            <!-- LEFT SIDE: FORM -->
            <div class="form-container">
                <h2>?? Email Configuration</h2>
                
                <div class="info-banner">
                    <h3>? Available Placeholders</h3>
                    <div class="placeholder-grid">
                        <div class="placeholder-item"><code>[-email-]</code> = Recipient email</div>
                        <div class="placeholder-item"><code>[-emailuser-]</code> = Email username</div>
                        <div class="placeholder-item"><code>[-time-]</code> = Current time</div>
                        <div class="placeholder-item"><code>[-sendername-]</code> = Random sender name</div>
                        <div class="placeholder-item"><code>%%domain%%</code> = Recipient domain (gmail.com, inwi.ma...)</div>
                        <div class="placeholder-item"><code>%%link%%</code> = Random link</div>
                        <div class="placeholder-item"><code>%%key%%</code> = Random keyword</div>
                        <div class="placeholder-item"><code>%%random_max%%</code> = Random 6-digit number</div>
                        <div class="placeholder-item"><code>%%random_2%%</code> = Long random string (140 chars)</div>
                        <div class="placeholder-item"><code>%%random_3%%</code> = Medium random string (32 chars)</div>
                        <div class="placeholder-item"><code>%%address%%</code> = Random US address</div>
                        <div class="placeholder-item"><code>%%user%%</code> = Random person name (API)</div>
                        <div class="placeholder-item"><code>class="..."</code> = Auto adds unique ID</div>
                    </div>
                </div>
                
                <form id="mailerForm" method="POST" enctype="multipart/form-data">
                    
                    <!-- SECTION 1: Basic Info -->
                    <div class="form-section">
                        <h3><span class="section-icon">1</span> Basic Information</h3>
                        <div class="inline-group">
                            <div>
                                <label>Your Email <span class="required">*</span></label>
                                <input type="email" name="from_email" required placeholder="your@email.com">
                            </div>
                            <div>
                                <label>Reply-To Email</label>
                                <input type="email" name="reply_to" placeholder="reply@email.com">
                            </div>
                        </div>
                        
                        <label>Subject <span class="required">*</span></label>
                        <input type="text" name="subject" required placeholder="Account notification from %%domain%% - Code: %%random_max%%">
                        <p class="helper-text">You can use any placeholder in the subject line</p>
                    </div>
                    
                    <!-- SECTION 2: Recipients & Sender Names -->
                    <div class="form-section">
                        <h3><span class="section-icon">2</span> Recipients & Sender Names</h3>
                        <label>Recipient Emails (one per line) <span class="required">*</span></label>
                        <textarea name="recipients" rows="5" required placeholder="user1@example.com&#10;user2@example.com&#10;user3@example.com"></textarea>
                        
                        <label>Sender Names <span class="badge">NEW</span></label>
                        <textarea name="sender_names" rows="4" placeholder="John Smith&#10;Maria Garcia&#10;David Johnson&#10;Sarah Williams&#10;&#10;A random name will be used for each email"></textarea>
                        <p class="helper-text">Each email will use a random name from this list. Use [-sendername-] placeholder in body.</p>
                    </div>
                    
                    <!-- SECTION 3: Lists -->
                    <div class="form-section">
                        <h3><span class="section-icon">3</span> Links & Keywords</h3>
                        <label>Links List (one per line)</label>
                        <textarea name="links_list" rows="4" placeholder="https://example.com/page1&#10;https://example.com/page2&#10;https://yoursite.com/offer"></textarea>
                        
                        <label>Keywords List (one per line)</label>
                        <textarea id="keywords_list" name="keywords_list" rows="4" placeholder="keyword1&#10;keyword2&#10;specialword&#10;promocode"></textarea>
                        
                        <div class="file-upload-wrapper">
                            <label class="file-upload-btn" for="keywords_file">
                                ?? Upload keywords.txt File
                            </label>
                            <input type="file" id="keywords_file" name="keywords_file" accept=".txt">
                            <p class="helper-text">Upload a text file with keywords (one per line) to auto-fill above</p>
                        </div>
                    </div>
                    
                    <!-- SECTION 4: Sending Settings -->
                    <div class="form-section">
                        <h3><span class="section-icon">4</span> Sending Configuration</h3>
                        <div class="inline-group">
                            <div>
                                <label>Concurrent Sends (at same time)</label>
                                <select id="batch_size" name="batch_size">
                                    <option value="1">1 email (slowest, safest)</option>
                                    <option value="2" selected>2 emails (recommended)</option>
                                    <option value="3">3 emails</option>
                                    <option value="5">5 emails</option>
                                    <option value="10">10 emails (faster, more load)</option>
                                </select>
                                <p class="helper-text">How many emails to send at once. Higher = faster but more server load.</p>
                            </div>
                            <div>
                                <label>Delay Between Batches (ms)</label>
                                <select id="batch_delay" name="batch_delay">
                                    <option value="100">100ms (fastest)</option>
                                    <option value="300" selected>300ms (recommended)</option>
                                    <option value="500">500ms</option>
                                    <option value="1000">1000ms (1 second)</option>
                                    <option value="2000">2000ms (2 seconds)</option>
                                </select>
                                <p class="helper-text">Delay between batches. Longer = safer for server.</p>
                            </div>
                        </div>
                    </div>
                    
                    <!-- SECTION 5: Email Settings -->
                    <div class="form-section">
                        <h3><span class="section-icon">5</span> Email Settings</h3>
                        <div class="inline-group">
                            <div>
                                <label>Priority</label>
                                <select name="priority">
                                    <option value="1">High</option>
                                    <option value="3" selected>Normal</option>
                                    <option value="5">Low</option>
                                </select>
                            </div>
                            <div>
                                <label>Charset</label>
                                <select name="charset">
                                    <option value="UTF-8" selected>UTF-8</option>
                                    <option value="ISO-8859-1">ISO-8859-1</option>
                                </select>
                            </div>
                        </div>
                        
                        <div class="inline-group">
                            <div>
                                <label>Format</label>
                                <select name="format">
                                    <option value="html" selected>HTML</option>
                                    <option value="text">Plain Text</option>
                                </select>
                            </div>
                            <div>
                                <label>Attachment</label>
                                <input type="file" name="attachment" style="display: block; padding: 8px;">
                            </div>
                        </div>
                        
                        <label class="checkbox-label">
                            <input type="checkbox" name="confirm_reading">
                            Request Read Receipt
                        </label>
                    </div>
                    
                    <!-- SECTION 6: Email Body -->
                    <div class="form-section">
                        <h3><span class="section-icon">6</span> Email Body</h3>
                        <label>HTML Content <span class="required">*</span></label>
                        <textarea id="email_body" name="body" rows="14" required placeholder="<!DOCTYPE html>&#10;<html>&#10;<head>&#10;    <style>&#10;        .container { padding: 20px; }&#10;    </style>&#10;</head>&#10;<body>&#10;    <div class='header'>&#10;        <h1>Hello [-email-]!</h1>&#10;        <p>From: [-sendername-] at %%domain%%</p>&#10;        <p>User: %%user%% at %%address%%</p>&#10;        <p>Your code: %%random_max%%</p>&#10;        <p>Token: %%random_3%%</p>&#10;        <a href='%%link%%'>Click here</a>&#10;    </div>&#10;</body>&#10;</html>"></textarea>
                        <p class="helper-text">Use HTML and placeholders. All class attributes will get unique IDs automatically.</p>
                    </div>
                    
                    <div class="button-group">
                        <button type="button" class="btn-secondary" id="previewBtn">??? Preview Email</button>
                        <button type="submit" class="btn-primary" id="sendBtn">?? Send Emails</button>
                    </div>
                </form>
                
                <div class="progress-container" id="progressContainer">
                    <h3>?? Sending Progress</h3>
                    <div class="progress-bar">
                        <div class="progress-fill" id="progressFill">0%</div>
                    </div>
                    <div class="progress-info" id="progressInfo">
                        Preparing to send...
                    </div>
                    <div class="results" id="results"></div>
                </div>
            </div>
            
            <!-- RIGHT SIDE: PREVIEW -->
            <div class="preview-container">
                <h2>??? Live Preview</h2>
                <div class="preview-controls">
                    <p style="color: #666; font-size: 0.9em;">Preview shows how your email will look with random placeholders</p>
                </div>
                <div class="preview-frame" id="previewFrame">
                    <div class="preview-empty">
                        Click "Preview Email" to see your email here
                    </div>
                </div>
            </div>
        </div>
    </div>

    <script>
        // Handle keywords file upload
        document.getElementById('keywords_file').addEventListener('change', async function(e) {
            const file = e.target.files[0];
            if (!file) return;
            
            const formData = new FormData();
            formData.append('keywords_file', file);
            formData.append('load_keywords', '1');
            
            try {
                const response = await fetch('', {
                    method: 'POST',
                    body: formData
                });
                const data = await response.json();
                
                if (data.success) {
                    document.getElementById('keywords_list').value = data.content;
                    alert('? Keywords loaded successfully!');
                } else {
                    alert('? Error loading keywords file');
                }
            } catch (error) {
                console.error('Error:', error);
                alert('? Error uploading file');
            }
        });
        
        // Handle preview
        document.getElementById('previewBtn').addEventListener('click', async function() {
            const formData = new FormData(document.getElementById('mailerForm'));
            formData.append('preview', '1');
            
            try {
                const response = await fetch('', {
                    method: 'POST',
                    body: formData
                });
                const data = await response.json();
                
                if (data.success) {
                    document.getElementById('previewFrame').innerHTML = data.html;
                } else {
                    alert('? Error generating preview');
                }
            } catch (error) {
                console.error('Error:', error);
                alert('? Error generating preview');
            }
        });
        
        // Handle form submission with concurrent sending
        document.getElementById('mailerForm').addEventListener('submit', async function(e) {
            e.preventDefault();
            
            const sendBtn = document.getElementById('sendBtn');
            const progressContainer = document.getElementById('progressContainer');
            const progressFill = document.getElementById('progressFill');
            const progressInfo = document.getElementById('progressInfo');
            const resultsDiv = document.getElementById('results');
            
            // Get all recipients
            const recipientsText = document.querySelector('textarea[name="recipients"]').value;
            const recipients = recipientsText.split('\n').map(email => email.trim()).filter(email => email);
            
            if (recipients.length === 0) {
                alert('? Please add at least one recipient email!');
                return;
            }
            
            // Disable form and show progress
            sendBtn.disabled = true;
            sendBtn.textContent = '? Sending...';
            progressContainer.style.display = 'block';
            resultsDiv.innerHTML = '';
            progressFill.style.width = '0%';
            progressFill.textContent = '0%';
            
            const totalEmails = recipients.length;
            let sentCount = 0;
            let errorCount = 0;
            let processedCount = 0;
            
            // Get all form data
            const formData = {
                from_email: document.querySelector('input[name="from_email"]').value,
                reply_to: document.querySelector('input[name="reply_to"]').value,
                subject: document.querySelector('input[name="subject"]').value,
                sender_names: document.querySelector('textarea[name="sender_names"]').value,
                links_list: document.querySelector('textarea[name="links_list"]').value,
                keywords_list: document.querySelector('textarea[name="keywords_list"]').value,
                priority: document.querySelector('select[name="priority"]').value,
                charset: document.querySelector('select[name="charset"]').value,
                format: document.querySelector('select[name="format"]').value,
                body: document.querySelector('textarea[name="body"]').value,
                confirm_reading: document.querySelector('input[name="confirm_reading"]').checked
            };
            
            // Function to send a single email
            async function sendSingleEmail(recipientEmail) {
                const emailFormData = new FormData();
                emailFormData.append('send_single_email', '1');
                emailFormData.append('recipient_email', recipientEmail);
                
                // Add all other form data
                for (const [key, value] of Object.entries(formData)) {
                    emailFormData.append(key, value);
                }
                
                try {
                    const response = await fetch('', {
                        method: 'POST',
                        body: emailFormData
                    });
                    
                    const data = await response.json();
                    return { success: true, data: data, email: recipientEmail };
                } catch (error) {
                    return { success: false, error: error, email: recipientEmail };
                }
            }
            
            // Function to update progress
            function updateProgress() {
                const progress = Math.round((processedCount / totalEmails) * 100);
                progressFill.style.width = progress + '%';
                progressFill.textContent = progress + '%';
                progressInfo.textContent = `Sending ${processedCount} of ${totalEmails} emails... (${sentCount} sent, ${errorCount} failed)`;
            }
            
            // Function to add result to UI
            function addResult(result) {
                const resultItem = document.createElement('div');
                
                if (result.success && result.data.success) {
                    sentCount++;
                    resultItem.className = 'result-item result-success';
                    resultItem.textContent = `? ${result.data.email}: ${result.data.message}`;
                    if (result.data.sender) {
                        resultItem.textContent += ` (Sender: ${result.data.sender})`;
                    }
                } else {
                    errorCount++;
                    resultItem.className = 'result-item result-error';
                    const errorMsg = result.data ? result.data.message : 'Network error';
                    resultItem.textContent = `? ${result.email}: ${errorMsg}`;
                }
                
                resultsDiv.appendChild(resultItem);
                resultsDiv.scrollTop = resultsDiv.scrollHeight;
                
                processedCount++;
                updateProgress();
            }
            
            // Send emails in batches with configurable settings
            const BATCH_SIZE = parseInt(document.getElementById('batch_size').value) || 2;
            const DELAY_BETWEEN_BATCHES = parseInt(document.getElementById('batch_delay').value) || 300;
            
            console.log(`Sending with batch size: ${BATCH_SIZE}, delay: ${DELAY_BETWEEN_BATCHES}ms`);
            
            for (let i = 0; i < recipients.length; i += BATCH_SIZE) {
                const batch = recipients.slice(i, i + BATCH_SIZE);
                
                // Send batch concurrently
                const promises = batch.map(email => sendSingleEmail(email));
                const results = await Promise.all(promises);
                
                // Process results
                results.forEach(result => addResult(result));
                
                // Small delay before next batch (except for last batch)
                if (i + BATCH_SIZE < recipients.length) {
                    await new Promise(resolve => setTimeout(resolve, DELAY_BETWEEN_BATCHES));
                }
            }
            
            // Show completion message
            progressFill.style.width = '100%';
            progressFill.textContent = '100%';
            progressInfo.innerHTML = `<strong>? Complete!</strong> Successfully sent ${sentCount} of ${totalEmails} emails. ${errorCount > 0 ? `(${errorCount} failed)` : ''}`;
            sendBtn.disabled = false;
            sendBtn.textContent = '?? Send Emails';
        });
        
        // Auto-update preview when body changes (with debounce)
        let previewTimeout;
        document.getElementById('email_body').addEventListener('input', function() {
            clearTimeout(previewTimeout);
            previewTimeout = setTimeout(() => {
                document.getElementById('previewBtn').click();
            }, 2000);
        });
    </script>
</body>
</html>