#ifndef SETTINGS_H
#define SETTINGS_H

const char settings_html[] PROGMEM = R"rawliteral(
<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
    <title>Settings - Byun CAN Logger</title>
    <style>
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            min-height: 100vh;
            padding: 10px;
        }
        .container {
            max-width: 800px;
            margin: 0 auto;
            background: white;
            border-radius: 15px;
            box-shadow: 0 20px 60px rgba(0,0,0,0.3);
            overflow: hidden;
        }
        .header {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            padding: 20px;
            text-align: center;
        }
        .header h1 { font-size: 1.8em; margin-bottom: 5px; }
        .header p { opacity: 0.9; font-size: 0.9em; }
        .nav {
            background: #2c3e50;
            padding: 10px;
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            justify-content: center;
        }
        .nav a {
            color: white;
            text-decoration: none;
            padding: 10px 15px;
            border-radius: 5px;
            transition: all 0.3s;
            font-size: 0.9em;
            white-space: nowrap;
        }
        .nav a:hover { background: #34495e; }
        .nav a.active { background: #3498db; }
        .content { padding: 30px; }
        
        .settings-section {
            background: #f8f9fa;
            padding: 25px;
            border-radius: 10px;
            margin-bottom: 20px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        
        .section-title {
            color: #333;
            font-size: 1.3em;
            margin-bottom: 20px;
            padding-bottom: 10px;
            border-bottom: 3px solid #667eea;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        
        .form-group {
            margin-bottom: 20px;
        }
        
        .form-group:last-child {
            margin-bottom: 0;
        }
        
        label {
            display: block;
            font-weight: 600;
            color: #333;
            margin-bottom: 8px;
            font-size: 0.95em;
        }
        
        .help-text {
            font-size: 0.85em;
            color: #666;
            margin-top: 5px;
            line-height: 1.4;
        }
        
        input[type="text"],
        input[type="password"] {
            width: 100%;
            padding: 12px 15px;
            border: 2px solid #e1e8ed;
            border-radius: 8px;
            font-size: 0.95em;
            transition: all 0.3s;
            background: white;
        }
        
        input[type="text"]:focus,
        input[type="password"]:focus {
            outline: none;
            border-color: #667eea;
            box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
        }
        
        input[type="checkbox"] {
            width: 20px;
            height: 20px;
            cursor: pointer;
            margin-right: 10px;
        }
        
        .checkbox-group {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }
        
        .checkbox-group label {
            margin-bottom: 0;
            cursor: pointer;
            user-select: none;
        }
        
        .sta-settings {
            background: #f0f4f8;
            padding: 20px;
            border-radius: 8px;
            margin-top: 15px;
            border-left: 4px solid #667eea;
        }
        
        .sta-settings.disabled {
            opacity: 0.5;
            pointer-events: none;
        }
        
        .button-group {
            display: flex;
            gap: 15px;
            margin-top: 30px;
            flex-wrap: wrap;
        }
        
        button {
            flex: 1;
            min-width: 150px;
            padding: 14px 28px;
            border: none;
            border-radius: 8px;
            font-size: 1em;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.3s;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        
        .btn-save {
            background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
            color: white;
            box-shadow: 0 4px 15px rgba(17, 153, 142, 0.3);
        }
        
        .btn-save:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(17, 153, 142, 0.4);
        }
        
        .btn-cancel {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
            box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
        }
        
        .btn-cancel:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
        }
        
        button:active {
            transform: translateY(0);
        }
        
        .alert {
            padding: 15px 20px;
            border-radius: 8px;
            margin-bottom: 20px;
            display: none;
            align-items: center;
            gap: 12px;
            animation: slideDown 0.3s ease-out;
        }
        
        @keyframes slideDown {
            from {
                opacity: 0;
                transform: translateY(-10px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .alert.show {
            display: flex;
        }
        
        .alert-success {
            background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
            color: white;
        }
        
        .alert-info {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            color: white;
        }
        
        .alert-warning {
            background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
            color: white;
        }
        
        .alert-icon {
            font-size: 1.5em;
        }
        
        .alert-text {
            flex: 1;
            font-weight: 600;
        }
        
        .info-box {
            background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
            border-left: 4px solid #667eea;
            padding: 15px 20px;
            border-radius: 8px;
            margin-top: 15px;
        }
        
        .info-box-title {
            font-weight: 700;
            color: #333;
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        
        .info-box-text {
            color: #555;
            font-size: 0.9em;
            line-height: 1.6;
        }
        
        @media (max-width: 768px) {
            .content { padding: 20px; }
            .settings-section { padding: 20px; }
            .section-title { font-size: 1.1em; }
            button { min-width: 100%; }
            .button-group { flex-direction: column; }
        }
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>⚙️ Settings</h1>
            <p>Configure WiFi and System Settings</p>
        </div>
        
        <div class="nav">
            <a href="/">📊 Monitor</a>
            <a href="/transmit">📤 Transmit</a>
            <a href="/graph">📈 Graph</a>
            <a href="/graph-view">📊 Graph View</a>
            <a href="/settings" class="active">⚙️ Settings</a>
        </div>
        
        <div class="content">
            <div id="alert-success" class="alert alert-success">
                <span class="alert-icon">✓</span>
                <span class="alert-text">Settings saved successfully!</span>
            </div>
            
            <div id="alert-loading" class="alert alert-info">
                <span class="alert-icon">⏳</span>
                <span class="alert-text">Loading settings...</span>
            </div>
            
            <div class="settings-section">
                <div class="section-title">
                    <span>📶</span>
                    <span>WiFi Configuration</span>
                </div>
                
                <h3 style="color: #333; font-size: 1.1em; margin-bottom: 15px;">AP Mode (Access Point)</h3>
                
                <div class="form-group">
                    <label for="wifi-ssid">AP SSID (네트워크 이름)</label>
                    <input type="text" id="wifi-ssid" placeholder="Byun_CAN_Logger" maxlength="31">
                    <div class="help-text">ESP32가 생성할 WiFi 네트워크 이름입니다 (최대 31자)</div>
                </div>
                
                <div class="form-group">
                    <label for="wifi-password">AP Password (비밀번호)</label>
                    <input type="password" id="wifi-password" placeholder="최소 8자 이상" minlength="8" maxlength="63">
                    <div class="help-text">WiFi 접속 시 필요한 비밀번호입니다 (8-63자)</div>
                </div>
                
                <hr style="margin: 25px 0; border: none; border-top: 1px solid #ddd;">
                
                <h3 style="color: #333; font-size: 1.1em; margin-bottom: 15px;">APSTA Mode (AP + Station)</h3>
                
                <div class="checkbox-group">
                    <input type="checkbox" id="sta-enable" onchange="toggleSTASettings()">
                    <label for="sta-enable">Station 모드 활성화 (외부 WiFi에 연결)</label>
                </div>
                <div class="help-text" style="margin-left: 30px; margin-bottom: 15px;">
                    AP와 Station을 동시에 사용하여 인터넷 접속 가능
                </div>
                
                <div id="sta-settings" class="sta-settings disabled">
                    <div class="form-group">
                        <label for="sta-ssid">연결할 WiFi SSID</label>
                        <input type="text" id="sta-ssid" placeholder="공유기 이름 입력" maxlength="31">
                        <div class="help-text">연결할 외부 WiFi 네트워크 이름</div>
                    </div>
                    
                    <div class="form-group">
                        <label for="sta-password">연결할 WiFi Password</label>
                        <input type="password" id="sta-password" placeholder="공유기 비밀번호 입력" maxlength="63">
                        <div class="help-text">외부 WiFi 비밀번호</div>
                    </div>
                    
                    <div id="sta-status" style="display: none; margin-top: 15px; padding: 12px; background: #e8f5e9; border-radius: 6px; color: #2e7d32; font-weight: 600;">
                        ✓ WiFi 연결됨: <span id="sta-ip"></span>
                    </div>
                </div>
            </div>
            
            <div class="button-group">
                <button class="btn-save" onclick="saveSettings()">💾 Save Settings</button>
                <button class="btn-cancel" onclick="location.href='/'">← Back to Monitor</button>
            </div>
            
            <div class="info-box" style="margin-top: 30px;">
                <div class="info-box-title">
                    <span>⚠️</span>
                    <span>중요 안내</span>
                </div>
                <div class="info-box-text">
                    • WiFi 설정을 변경한 경우, ESP32를 재부팅해야 새 SSID/비밀번호가 적용됩니다.<br>
                    • <strong>APSTA 모드:</strong> Station 모드를 활성화하면 ESP32가 AP와 Station을 동시에 사용합니다.<br>
                    • Station 모드로 외부 WiFi에 연결하면 인터넷 접속이 가능해집니다.<br>
                    • Station 연결 실패 시에도 AP 모드는 정상 동작합니다.<br>
                    • 설정 저장 후 ESP32의 리셋 버튼을 눌러 재부팅하세요.
                </div>
            </div>
        </div>
    </div>
    
    <script>
        let ws;
        
        function initWebSocket() {
            ws = new WebSocket('ws://' + window.location.hostname + ':81/');
            
            ws.onopen = function() {
                console.log('WebSocket connected');
                loadSettings();
            };
            
            ws.onclose = function() {
                console.log('WebSocket disconnected');
                showAlert('alert-loading', '연결 끊김. 재연결 시도 중...', 'alert-warning');
                setTimeout(initWebSocket, 3000);
            };
            
            ws.onerror = function(error) {
                console.error('WebSocket error:', error);
            };
            
            ws.onmessage = function(event) {
                try {
                    const data = JSON.parse(event.data);
                    
                    if (data.type === 'settings') {
                        document.getElementById('wifi-ssid').value = data.ssid || 'Byun_CAN_Logger';
                        document.getElementById('wifi-password').value = data.password || '';
                        
                        // STA 모드 설정 로드
                        document.getElementById('sta-enable').checked = data.staEnable || false;
                        document.getElementById('sta-ssid').value = data.staSSID || '';
                        document.getElementById('sta-password').value = data.staPassword || '';
                        
                        // STA 설정 표시/숨김
                        toggleSTASettings();
                        
                        // STA 연결 상태 표시
                        if (data.staConnected && data.staIP && data.staIP !== '0.0.0.0') {
                            document.getElementById('sta-ip').textContent = data.staIP;
                            document.getElementById('sta-status').style.display = 'block';
                        } else {
                            document.getElementById('sta-status').style.display = 'none';
                        }
                        
                        hideAlert('alert-loading');
                        console.log('Settings loaded:', data);
                    } else if (data.type === 'settingsSaved') {
                        if (data.success) {
                            showAlert('alert-success', '설정이 저장되었습니다! 재부팅 후 적용됩니다.', 'alert-success');
                        }
                    }
                } catch (e) {
                    console.error('Parse error:', e);
                }
            };
        }
        
        function loadSettings() {
            if (ws && ws.readyState === WebSocket.OPEN) {
                ws.send(JSON.stringify({cmd: 'getSettings'}));
                showAlert('alert-loading', '설정을 불러오는 중...', 'alert-info');
            }
        }
        
        function saveSettings() {
            const ssid = document.getElementById('wifi-ssid').value.trim();
            const password = document.getElementById('wifi-password').value;
            
            // STA 모드 설정
            const staEnable = document.getElementById('sta-enable').checked;
            const staSSID = document.getElementById('sta-ssid').value.trim();
            const staPassword = document.getElementById('sta-password').value;
            
            // 입력 검증
            if (ssid.length === 0) {
                alert('WiFi SSID를 입력하세요.');
                return;
            }
            
            if (ssid.length > 31) {
                alert('WiFi SSID는 최대 31자까지 입력 가능합니다.');
                return;
            }
            
            if (password.length > 0 && password.length < 8) {
                alert('WiFi 비밀번호는 최소 8자 이상이어야 합니다.');
                return;
            }
            
            if (password.length > 63) {
                alert('WiFi 비밀번호는 최대 63자까지 입력 가능합니다.');
                return;
            }
            
            // STA 모드 검증
            if (staEnable) {
                if (staSSID.length === 0) {
                    alert('Station 모드를 활성화하려면 WiFi SSID를 입력하세요.');
                    return;
                }
                if (staSSID.length > 31) {
                    alert('Station WiFi SSID는 최대 31자까지 입력 가능합니다.');
                    return;
                }
                if (staPassword.length > 0 && staPassword.length < 8) {
                    alert('Station WiFi 비밀번호는 최소 8자 이상이어야 합니다.');
                    return;
                }
            }
            
            const settings = {
                cmd: 'saveSettings',
                ssid: ssid,
                password: password,
                staEnable: staEnable,
                staSSID: staSSID,
                staPassword: staPassword
            };
            
            if (ws && ws.readyState === WebSocket.OPEN) {
                ws.send(JSON.stringify(settings));
                console.log('Settings saved:', settings);
            } else {
                alert('WebSocket 연결이 끊겼습니다. 페이지를 새로고침하세요.');
            }
        }
        
        function showAlert(alertId, message, className) {
            const alert = document.getElementById(alertId);
            if (alert) {
                const textElement = alert.querySelector('.alert-text');
                if (textElement && message) {
                    textElement.textContent = message;
                }
                
                // 기존 클래스 제거
                alert.className = 'alert ' + className;
                alert.classList.add('show');
                
                // 3초 후 자동 숨김 (success 알림만)
                if (className === 'alert-success') {
                    setTimeout(() => {
                        hideAlert(alertId);
                    }, 5000);
                }
            }
        }
        
        function hideAlert(alertId) {
            const alert = document.getElementById(alertId);
            if (alert) {
                alert.classList.remove('show');
            }
        }
        
        function toggleSTASettings() {
            const staEnable = document.getElementById('sta-enable').checked;
            const staSettings = document.getElementById('sta-settings');
            
            if (staEnable) {
                staSettings.classList.remove('disabled');
            } else {
                staSettings.classList.add('disabled');
            }
        }
        
        // 페이지 로드 시 WebSocket 연결
        window.addEventListener('load', function() {
            initWebSocket();
        });
    </script>
</body>
</html>
)rawliteral";

#endif