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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>AERO|PULSE Dashboard</title>
    <!-- Use Google Fonts -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;800&family=Orbitron:wght@500;700&display=swap" rel="stylesheet">
    <!-- Chart.js for graphs -->
    <script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
    <style>
        :root {
            --bg-color: #0b1120;
            --panel-bg: rgba(20, 30, 50, 0.6);
            --border-color: rgba(60, 90, 130, 0.4);
            --text-main: #e2e8f0;
            --text-muted: #94a3b8;
            --accent-blue: #38bdf8;
            --accent-green: #34d399;
            --accent-warning: #fbbf24;
            --accent-danger: #f87171;
            --glow: 0 0 15px rgba(56, 189, 248, 0.4);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        
        body {
            font-family: 'Inter', sans-serif;
            background-color: var(--bg-color);
            color: var(--text-main);
            display: flex;
            height: 100vh;
            overflow: hidden;
            position: relative;
        }
        
        .engine-bg {
            position: fixed;
            top: 0;
            left: 250px; /* offset by sidebar */
            width: calc(100vw - 250px);
            height: 100vh;
            background-image: url('engine_bg.png');
            background-size: cover;
            background-position: top left;
            z-index: -1;
            opacity: 0.4;
            mask-image: radial-gradient(circle at top left, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 65%);
            -webkit-mask-image: radial-gradient(circle at top left, rgba(0,0,0,1) 0%, rgba(0,0,0,0) 65%);
            pointer-events: none;
        }

        /* Sidebar */
        .sidebar {
            width: 240px;
            background: rgba(10, 15, 30, 0.8);
            border-right: 1px solid var(--border-color);
            padding: 2rem 1rem;
            display: flex;
            flex-direction: column;
            gap: 2rem;
            backdrop-filter: blur(10px);
        }

        .logo {
            font-family: 'Orbitron', sans-serif;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: 2px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo span { color: var(--accent-blue); text-shadow: var(--glow); }

        .nav-item {
            padding: 0.8rem 1rem;
            border-radius: 8px;
            cursor: pointer;
            color: var(--text-muted);
            transition: all 0.3s ease;
            font-weight: 600;
        }
        .nav-item:hover, .nav-item.active {
            background: rgba(56, 189, 248, 0.1);
            color: var(--accent-blue);
        }

        /* Main Content */
        .main-content {
            flex: 1;
            padding: 2rem;
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            overflow-y: auto;
        }

        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-bottom: 1rem;
            border-bottom: 1px solid var(--border-color);
        }

        .status-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(52, 211, 153, 0.1);
            color: var(--accent-green);
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.875rem;
            font-weight: 600;
            border: 1px solid rgba(52, 211, 153, 0.3);
        }
        .status-badge .dot {
            width: 8px; height: 8px;
            background: var(--accent-green);
            border-radius: 50%;
            box-shadow: 0 0 10px var(--accent-green);
        }

        /* Grid Layout */
        .dashboard-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            grid-template-rows: auto auto;
            gap: 1.5rem;
            height: 100%;
        }

        .panel {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 1.5rem;
            backdrop-filter: blur(12px);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
            display: flex;
            flex-direction: column;
        }

        .panel-title {
            font-size: 0.875rem;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 1rem;
            font-weight: 600;
        }

        /* RUL Gauge Area */
        .rul-container {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            flex: 1;
        }

        .gauge {
            position: relative;
            width: 250px;
            height: 250px;
            border-radius: 50%;
            background: conic-gradient(var(--accent-warning) 0% 78%, rgba(255,255,255,0.05) 78% 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 30px rgba(251, 191, 36, 0.2);
            margin-bottom: 1rem;
        }
        
        .gauge::before {
            content: '';
            position: absolute;
            width: 210px; height: 210px;
            background: var(--bg-color);
            border-radius: 50%;
            box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
        }

        .gauge-content {
            position: relative;
            z-index: 1;
            text-align: center;
        }

        .gauge-value {
            font-size: 3.5rem;
            font-family: 'Orbitron', sans-serif;
            font-weight: 700;
            background: linear-gradient(180deg, #fff, #fbbf24);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.1;
        }

        .gauge-label { color: var(--text-muted); font-size: 0.875rem; }

        .engine-selector {
            background: rgba(10, 15, 30, 0.6);
            color: #fff;
            border: 1px solid var(--border-color);
            padding: 0.85rem 1.25rem;
            border-radius: 8px;
            font-size: 1rem;
            font-weight: 500;
            margin-bottom: 0.75rem;
            width: 100%;
            cursor: pointer;
            outline: none;
            transition: all 0.3s ease;
            appearance: none;
            -webkit-appearance: none;
            -moz-appearance: none;
            background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2338bdf8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
            background-repeat: no-repeat;
            background-position: right 1rem top 50%;
            background-size: 0.8rem auto;
            backdrop-filter: blur(10px);
            box-shadow: inset 0 1px 3px rgba(0,0,0,0.3), 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .engine-selector:hover {
            border-color: var(--accent-blue);
            background-color: rgba(15, 25, 45, 0.8);
            box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
            transform: translateY(-1px);
        }
        
        .engine-selector:focus {
            border-color: var(--accent-blue);
        }
        
        .engine-selector option {
            background-color: #0f172a;
            color: #fff;
        }

        .engine-stats {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            width: 100%;
            gap: 1rem;
            margin-top: 2rem;
            border-top: 1px solid var(--border-color);
            padding-top: 1rem;
            text-align: center;
        }

        .stat-val { font-size: 1.25rem; font-weight: 600; color: #fff; }
        .stat-title { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; }

        /* Charts */
        .chart-container {
            position: relative;
            flex: 1;
            width: 100%;
            min-height: 200px;
        }

        .alerts-panel {
            grid-row: span 2;
        }
        
        .alert-item {
            background: rgba(248, 113, 113, 0.1);
            border-left: 4px solid var(--accent-danger);
            padding: 1rem;
            border-radius: 4px;
            margin-bottom: 1rem;
        }
        .alert-title { color: var(--accent-danger); font-weight: 600; font-size: 0.875rem; }
        .alert-desc { color: var(--text-muted); font-size: 0.75rem; margin-top: 4px; }
        
        /* Views */
        .view { display: none; height: 100%; }
        .view.active { display: block; }
        
        /* Fleet Table */
        .fleet-table-container {
            background: var(--panel-bg);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 1.5rem;
            margin-top: 1.5rem;
            overflow-y: auto;
            max-height: calc(100vh - 120px);
        }
        
        .fleet-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        
        .fleet-table th {
            color: var(--text-muted);
            font-size: 0.75rem;
            text-transform: uppercase;
            padding: 1rem;
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            background: rgba(10, 15, 30, 0.95);
            z-index: 2;
        }
        
        .fleet-table td {
            padding: 1rem;
            border-bottom: 1px solid rgba(60, 90, 130, 0.2);
            font-size: 0.875rem;
        }
        
        .fleet-table tr:hover {
            background: rgba(56, 189, 248, 0.05);
        }

        .status-pill {
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            display: inline-block;
        }

    </style>
</head>
<body>
    <div class="engine-bg"></div>

    <div class="sidebar">
        <div class="logo">AERO<span>|</span>PULSE</div>
        <div class="nav-item active" onclick="switchView('dashboard', this)">Dashboard</div>
        <div class="nav-item" onclick="switchView('analysis', this)">Analysis</div>
        <div class="nav-item" onclick="switchView('engines', this)">Engines</div>
        <div class="nav-item" onclick="switchView('maintenance', this)">Maintenance</div>
        <div class="nav-item" onclick="switchView('alerts', this)">Alerts</div>
    </div>

    <div class="main-content">
        <div class="header">
            <div class="status-badge"><div class="dot"></div> System Status: Healthy</div>
            <div style="color: var(--text-muted); font-size: 0.875rem;">LSTM Predictive Maintenance API</div>
        </div>

        <div id="view-dashboard" class="view active">
            <div class="dashboard-grid">
                
                <!-- RUL Panel -->
                <div class="panel">
                    <div class="panel-title">Remaining Useful Life (RUL)</div>
                    <div class="rul-container">
                        <div class="gauge" id="rulGauge">
                            <div class="gauge-content">
                                <div class="gauge-value" id="rulValue">--</div>
                                <div class="gauge-label">Cycles Remaining</div>
                            </div>
                        </div>
                        <div style="text-align: center; margin-bottom: 2rem; width: 90%; margin-left: auto; margin-right: auto;">
                            <select id="engineSelect" class="engine-selector" onchange="changeEngine()">
                                <!-- Options injected by JS -->
                            </select>
                            <p style="color: var(--text-muted); font-size: 0.75rem; letter-spacing: 0.5px; text-transform: uppercase;">NASA CMAPSS Simulation</p>
                        </div>
                        <div class="engine-stats">
                            <div>
                                <div class="stat-val" id="flightCycles">0</div>
                                <div class="stat-title">Flight Cycles</div>
                            </div>
                            <div>
                                <div class="stat-val" style="color: var(--accent-green);" id="engineStatus">OPERATIONAL</div>
                                <div class="stat-title">Status</div>
                            </div>
                            <div>
                            <button onclick="fetchEngineData()" style="background: var(--accent-blue); color: #fff; border: none; padding: 0.5rem 1rem; border-radius: 4px; cursor: pointer; font-weight: 600;">Refresh Data</button>
                        </div>
                        </div>
                    </div>
                </div>

                <!-- EGT Sensor Chart -->
                <div class="panel">
                    <div class="panel-title">SENSOR TELEMETRY - Sensor 11 (EGT)</div>
                    <div class="chart-container">
                        <canvas id="egtChart"></canvas>
                    </div>
                </div>

                <!-- RPM Sensor Chart -->
                <div class="panel">
                    <div class="panel-title">SENSOR TELEMETRY - Sensor 14 (Core Speed)</div>
                    <div class="chart-container">
                        <canvas id="rpmChart"></canvas>
                    </div>
                </div>

                <!-- Alerts -->
                <div class="panel alerts-panel">
                    <div class="panel-title">Active Alerts</div>
                    <div id="alertsContainer">
                        <p style="color: var(--text-muted); font-size: 0.875rem;">No critical alerts currently.</p>
                    </div>
                </div>

            </div>
        </div>
        
        <div id="view-analysis" class="view">
            <h2 style="margin-bottom: 0.5rem; color: #fff;">Fleet Analysis & Diagnostics</h2>
            <p style="color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem;">Macro-level overview of RR Trent XWB predictive health models.</p>
            
            <div class="dashboard-grid">
                <!-- Fleet Health Distribution Chart -->
                <div class="panel" style="grid-column: span 2;">
                    <div class="panel-title">Fleet RUL Distribution</div>
                    <div class="chart-container" style="height: 300px;">
                        <canvas id="analysisChart"></canvas>
                    </div>
                </div>

                <!-- Overall Fleet Average RUL Gauge -->
                <div class="panel">
                    <div class="panel-title">Average Fleet RUL</div>
                    <div class="rul-container" style="margin-top: 1rem;">
                        <div class="gauge" id="analysisGauge">
                            <div class="gauge-content">
                                <div class="gauge-value" id="analysisGaugeValue">--</div>
                                <div class="gauge-label">Avg. Cycles</div>
                            </div>
                        </div>
                        <div class="engine-stats" style="margin-top: 2rem;">
                            <div>
                                <div class="stat-val" id="statCritical" style="color: var(--accent-danger);">0</div>
                                <div class="stat-title" style="font-size: 0.7rem;">Critical</div>
                            </div>
                            <div>
                                <div class="stat-val" id="statMaintenance" style="color: var(--accent-warning);">0</div>
                                <div class="stat-title" style="font-size: 0.7rem;">Maintenance</div>
                            </div>
                            <div>
                                <div class="stat-val" id="statOperational" style="color: var(--accent-green);">0</div>
                                <div class="stat-title" style="font-size: 0.7rem;">Operational</div>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
        
        <div id="view-engines" class="view">
            <h2 style="margin-bottom: 0.5rem; color: #fff;">Fleet Overview</h2>
            <p style="color: var(--text-muted); font-size: 0.875rem;">Real-time health status of all 100 RR Trent XWB engines</p>
            
            <div class="fleet-table-container">
                <table class="fleet-table">
                    <thead>
                        <tr>
                            <th>Engine ID</th>
                            <th>Current Cycles</th>
                            <th>Predicted RUL</th>
                            <th>Health Status</th>
                            <th>Action</th>
                        </tr>
                    </thead>
                    <tbody id="fleetTableBody">
                        <!-- Populated by JS -->
                    </tbody>
                </table>
            </div>
        </div>

        <div id="view-maintenance" class="view">
            <h2 style="margin-bottom: 0.5rem; color: #fff;">Maintenance Work Orders</h2>
            <p style="color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem;">Manage and dispatch repair crews for degraded engines.</p>
            
            <div class="dashboard-grid">
                <div class="panel" style="grid-column: span 1;">
                    <div class="panel-title" style="color: var(--accent-danger);">High Priority (Ground Immediate)</div>
                    <div id="maintenanceCriticalList" style="margin-top: 1rem;">
                        <!-- JS injected -->
                    </div>
                </div>
                <div class="panel" style="grid-column: span 1;">
                    <div class="panel-title" style="color: var(--accent-warning);">Scheduled Maintenance (Due Soon)</div>
                    <div id="maintenanceWarningList" style="margin-top: 1rem;">
                        <!-- JS injected -->
                    </div>
                </div>
            </div>
        </div>
        
        <div id="view-alerts" class="view">
            <h2 style="margin-bottom: 0.5rem; color: #fff;">System Alerts Log</h2>
            <p style="color: var(--text-muted); font-size: 0.875rem; margin-bottom: 1.5rem;">Chronological history of all automated RUL warnings.</p>
            
            <div class="fleet-table-container" style="background: transparent; border: none; padding: 0; margin-top: 0;">
                <div id="alertsLogContainer" style="display: flex; flex-direction: column; gap: 1rem;">
                    <!-- JS Injected -->
                </div>
            </div>
        </div>

    </div>

    <script>
        const chartOptions = {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: { display: false }
            },
            scales: {
                x: { display: false },
                y: {
                    grid: { color: 'rgba(60, 90, 130, 0.05)' },
                    border: { display: false },
                    ticks: { color: '#94a3b8' }
                }
            },
            elements: {
                point: { radius: 0 }
            }
        };

        function createChart(ctx, color, label) {
            // Gradient fill
            let gradient = ctx.createLinearGradient(0, 0, 0, 300);
            gradient.addColorStop(0, color + '22'); 
            gradient.addColorStop(1, color + '00'); 

            return new Chart(ctx, {
                type: 'line',
                data: {
                    labels: [],
                    datasets: [{
                        label: label,
                        borderColor: color,
                        backgroundColor: gradient,
                        borderWidth: 2,
                        tension: 0.4,
                        fill: true
                    }]
                },
                options: chartOptions
            });
        }

        // Initialize Charts
        const egtChart = createChart(document.getElementById('egtChart').getContext('2d'), '#f97316', 'Temperature');
        const rpmChart = createChart(document.getElementById('rpmChart').getContext('2d'), '#38bdf8', 'RPM');

        let analysisChart = new Chart(document.getElementById('analysisChart'), {
            type: 'bar',
            data: {
                labels: ['Critical (<20)', 'Maintenance Due (20-50)', 'Operational (>50)'],
                datasets: [{
                    label: 'Number of Engines',
                    data: [0, 0, 0],
                    backgroundColor: [
                        'rgba(248, 113, 113, 0.8)',
                        'rgba(251, 191, 36, 0.8)',
                        'rgba(52, 211, 153, 0.8)'
                    ],
                    borderRadius: 4
                }]
            },
            options: {
                responsive: true,
                maintainAspectRatio: false,
                plugins: { legend: { display: false } },
                scales: {
                    y: { beginAtZero: true, grid: { color: 'rgba(60, 90, 130, 0.1)' } },
                    x: { grid: { display: false } }
                }
            }
        });

        let currentCycle = 0;
        let currentEngineId = 1;

        // Populate engine selector
        const engineSelect = document.getElementById('engineSelect');
        for(let i=1; i<=100; i++) {
            const opt = document.createElement('option');
            opt.value = i;
            opt.innerText = `Engine #${i} - RR Trent XWB`;
            engineSelect.appendChild(opt);
        }

        function changeEngine() {
            currentEngineId = document.getElementById('engineSelect').value;
            currentCycle = 0;
            document.getElementById('flightCycles').innerText = currentCycle;
            document.getElementById('rulValue').innerText = '--';
            document.getElementById('engineStatus').innerText = 'OPERATIONAL';
            document.getElementById('engineStatus').style.color = '#34d399';
            
            // Reset charts visually
            [egtChart, rpmChart].forEach(chart => {
                chart.data.datasets[0].data = [];
                chart.update();
            });
            
            fetchEngineData();
        }

        // Real prediction fetching from FastAPI backend
        async function fetchEngineData() {
            try {
                const response = await fetch(`/engine/${currentEngineId}/history`);
                
                if (response.ok) {
                    const data = await response.json();
                    
                    document.getElementById('flightCycles').innerText = data.current_cycle;
                    updateDashboard(data.predicted_rul);
                    
                    // Populate charts with actual NASA test data
                    egtChart.data.labels = data.history.cycles;
                    egtChart.data.datasets[0].data = data.history.sensor_11;
                    egtChart.update();
                    
                    rpmChart.data.labels = data.history.cycles;
                    rpmChart.data.datasets[0].data = data.history.sensor_14;
                    rpmChart.update();
                } else {
                    console.error("Failed to load engine data");
                }
            } catch (e) {
                console.error("Backend offline", e);
            }
        }

        function updateDashboard(rul) {
            const rulValue = document.getElementById('rulValue');
            const gauge = document.getElementById('rulGauge');
            const status = document.getElementById('engineStatus');
            const alerts = document.getElementById('alertsContainer');

            rul = Math.round(rul);
            rulValue.innerText = rul;

            // Calculate percentage assuming max ~200
            let pct = Math.min((rul / 200) * 100, 100);
            
            // Color logic
            let color = '#34d399'; // Green
            if (rul < 50) color = '#fbbf24'; // Yellow
            if (rul < 20) color = '#f87171'; // Red

            gauge.style.background = `conic-gradient(${color} 0% ${pct}%, rgba(255,255,255,0.05) ${pct}% 100%)`;
            rulValue.style.background = `linear-gradient(180deg, #fff, ${color})`;
            rulValue.style.webkitBackgroundClip = 'text';

            if (rul >= 50) {
                status.innerText = 'OPERATIONAL';
                status.style.color = '#34d399';
                alerts.innerHTML = '<p style="color: var(--text-muted); font-size: 0.875rem;">No critical alerts currently.</p>';
            } else if (rul >= 20) {
                status.innerText = 'MAINTENANCE DUE';
                status.style.color = '#fbbf24';
                alerts.innerHTML = `
                    <div class="alert-item" style="border-left-color: #fbbf24; background: rgba(251, 191, 36, 0.1);">
                        <div class="alert-title" style="color: #fbbf24;">Maintenance Warning</div>
                        <div class="alert-desc">RUL has dropped below 50 cycles. Schedule inspection.</div>
                    </div>`;
            } else {
                status.innerText = 'CRITICAL FAILING';
                status.style.color = '#f87171';
                alerts.innerHTML = `
                    <div class="alert-item">
                        <div class="alert-title">CRITICAL ALERT</div>
                        <div class="alert-desc">Engine failure imminent. RUL < 20 cycles. Ground aircraft immediately.</div>
                    </div>`;
            }

            // Charts are now updated directly from fetchEngineData()
        }

        // View Switching & Fleet Generation
        function switchView(viewId, element) {
            document.querySelectorAll('.view').forEach(v => v.classList.remove('active'));
            document.querySelectorAll('.nav-item').forEach(n => n.classList.remove('active'));
            
            document.getElementById('view-' + viewId).classList.add('active');
            element.classList.add('active');
            
            if (viewId === 'engines') {
                generateFleetTable();
            } else if (viewId === 'analysis') {
                generateAnalysisView();
            } else if (viewId === 'maintenance') {
                generateMaintenanceView();
            } else if (viewId === 'alerts') {
                generateAlertsView();
            }
        }
        
        async function generateAnalysisView() {
            try {
                const response = await fetch('/fleet');
                if (response.ok) {
                    const engines = await response.json();
                    
                    let critical = 0;
                    let warning = 0;
                    let operational = 0;
                    let totalRul = 0;
                    
                    engines.forEach(eng => {
                        let rul = Math.round(eng.rul);
                        totalRul += rul;
                        if (rul < 20) critical++;
                        else if (rul <= 50) warning++;
                        else operational++;
                    });
                    
                    // Update Stats
                    document.getElementById('statCritical').innerText = critical;
                    document.getElementById('statMaintenance').innerText = warning;
                    document.getElementById('statOperational').innerText = operational;
                    
                    // Update Gauge
                    let avgRul = Math.round(totalRul / engines.length);
                    document.getElementById('analysisGaugeValue').innerText = avgRul;
                    
                    const gauge = document.getElementById('analysisGauge');
                    if (avgRul > 50) {
                        gauge.style.background = `conic-gradient(var(--accent-green) ${(avgRul/150)*100}%, rgba(255,255,255,0.05) 0)`;
                        document.getElementById('analysisGaugeValue').style.color = 'var(--accent-green)';
                    } else if (avgRul > 20) {
                        gauge.style.background = `conic-gradient(var(--accent-warning) ${(avgRul/150)*100}%, rgba(255,255,255,0.05) 0)`;
                        document.getElementById('analysisGaugeValue').style.color = 'var(--accent-warning)';
                    } else {
                        gauge.style.background = `conic-gradient(var(--accent-danger) ${(avgRul/150)*100}%, rgba(255,255,255,0.05) 0)`;
                        document.getElementById('analysisGaugeValue').style.color = 'var(--accent-danger)';
                    }
                    
                    // Update Chart
                    analysisChart.data.datasets[0].data = [critical, warning, operational];
                    analysisChart.update();
                }
            } catch (e) {
                console.error("Failed to load analysis data", e);
            }
        }
        
        async function generateFleetTable() {
            const tbody = document.getElementById('fleetTableBody');
            tbody.innerHTML = '<tr><td colspan="5" style="text-align: center; color: var(--text-muted); padding: 2rem;">Analyzing all 100 engines...</td></tr>';
            
            try {
                const response = await fetch('/fleet');
                if (response.ok) {
                    const engines = await response.json();
                    tbody.innerHTML = '';
                    
                    engines.forEach(eng => {
                        let statusHtml = '';
                        let rul = Math.round(eng.rul);
                        
                        if (rul >= 50) {
                            statusHtml = `<span class="status-pill" style="background: rgba(52, 211, 153, 0.1); color: var(--accent-green); border: 1px solid var(--accent-green);">OPERATIONAL</span>`;
                        } else if (rul >= 20) {
                            statusHtml = `<span class="status-pill" style="background: rgba(251, 191, 36, 0.1); color: var(--accent-warning); border: 1px solid var(--accent-warning);">MAINTENANCE DUE</span>`;
                        } else {
                            statusHtml = `<span class="status-pill" style="background: rgba(248, 113, 113, 0.1); color: var(--accent-danger); border: 1px solid var(--accent-danger);">CRITICAL FAILING</span>`;
                        }
                        
                        const tr = document.createElement('tr');
                        tr.innerHTML = `
                            <td style="font-weight: 600;">Engine #${eng.id}</td>
                            <td>${eng.cycles}</td>
                            <td style="font-family: 'Orbitron', sans-serif;">${rul} cycles</td>
                            <td>${statusHtml}</td>
                            <td>
                                <button onclick="inspectEngine(${eng.id})" style="background: transparent; color: var(--accent-blue); border: 1px solid var(--accent-blue); padding: 4px 8px; border-radius: 4px; cursor: pointer; font-size: 0.75rem;">Inspect</button>
                            </td>
                        `;
                        tbody.appendChild(tr);
                    });
                }
            } catch (e) {
                console.error("Failed to load fleet data", e);
            }
        }
        
        function inspectEngine(id) {
            // Jump back to dashboard and select this engine
            document.getElementById('engineSelect').value = id;
            changeEngine();
            switchView('dashboard', document.querySelector('.nav-item')); // Selects first nav item
        }
        
        async function generateMaintenanceView() {
            document.getElementById('maintenanceCriticalList').innerHTML = '<p style="color: var(--text-muted);">Loading...</p>';
            document.getElementById('maintenanceWarningList').innerHTML = '<p style="color: var(--text-muted);">Loading...</p>';
            
            try {
                const response = await fetch('/fleet');
                if (response.ok) {
                    const engines = await response.json();
                    let critHtml = '';
                    let warnHtml = '';
                    
                    engines.forEach(eng => {
                        let rul = Math.round(eng.rul);
                        if (rul < 20) {
                            critHtml += `
                                <div style="background: rgba(248, 113, 113, 0.05); border: 1px solid var(--accent-danger); border-radius: 8px; padding: 1rem; margin-bottom: 1rem;">
                                    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem;">
                                        <strong style="color: var(--accent-danger); font-size: 1.1rem;">Engine #${eng.id}</strong>
                                        <span style="font-family: 'Orbitron', sans-serif; font-size: 0.875rem; color: #fff;">RUL: ${rul}</span>
                                    </div>
                                    <p style="font-size: 0.75rem; color: var(--text-muted); margin-bottom: 1rem;">Requires immediate HPC inspection. High risk of failure.</p>
                                    <button style="background: var(--accent-danger); color: #fff; border: none; padding: 6px 12px; border-radius: 4px; cursor: pointer; font-size: 0.75rem; font-weight: 600;">Dispatch Crew</button>
                                </div>
                            `;
                        } else if (rul <= 50) {
                            warnHtml += `
                                <div style="background: rgba(251, 191, 36, 0.05); border: 1px solid rgba(251, 191, 36, 0.3); border-radius: 8px; padding: 1rem; margin-bottom: 1rem;">
                                    <div style="display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.5rem;">
                                        <strong style="color: var(--accent-warning); font-size: 1.1rem;">Engine #${eng.id}</strong>
                                        <span style="font-family: 'Orbitron', sans-serif; font-size: 0.875rem; color: #fff;">RUL: ${rul}</span>
                                    </div>
                                    <p style="font-size: 0.75rem; color: var(--text-muted); margin-bottom: 1rem;">Schedule routine maintenance within ${rul} flights.</p>
                                    <button style="background: transparent; color: var(--accent-warning); border: 1px solid var(--accent-warning); padding: 6px 12px; border-radius: 4px; cursor: pointer; font-size: 0.75rem; font-weight: 600;">Schedule Task</button>
                                </div>
                            `;
                        }
                    });
                    
                    document.getElementById('maintenanceCriticalList').innerHTML = critHtml || '<p style="color: var(--text-muted); font-size: 0.875rem;">No critical work orders.</p>';
                    document.getElementById('maintenanceWarningList').innerHTML = warnHtml || '<p style="color: var(--text-muted); font-size: 0.875rem;">No scheduled maintenance.</p>';
                }
            } catch (e) {
                console.error("Failed to load maintenance data", e);
            }
        }

        async function generateAlertsView() {
            const container = document.getElementById('alertsLogContainer');
            container.innerHTML = '<p style="color: var(--text-muted);">Loading system logs...</p>';
            
            try {
                const response = await fetch('/fleet');
                if (response.ok) {
                    const engines = await response.json();
                    let logHtml = '';
                    
                    // Sort engines by worst first to show critical alerts at top
                    engines.sort((a, b) => a.rul - b.rul);
                    
                    engines.forEach(eng => {
                        let rul = Math.round(eng.rul);
                        let timeOffset = Math.floor(Math.random() * 60); // Mock timestamp offset
                        
                        if (rul < 20) {
                            logHtml += `
                                <div style="background: var(--panel-bg); border-left: 4px solid var(--accent-danger); padding: 1.25rem; border-radius: 4px; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 4px 6px rgba(0,0,0,0.1);">
                                    <div>
                                        <div style="color: var(--accent-danger); font-weight: 600; margin-bottom: 4px;">CRITICAL: Engine #${eng.id} Remaining Useful Life breached 20 cycles</div>
                                        <div style="color: var(--text-muted); font-size: 0.875rem;">Automated grounding protocol recommended. Estimated RUL: <span style="color:#fff; font-weight:600">${rul}</span> cycles.</div>
                                    </div>
                                    <div style="color: var(--text-muted); font-size: 0.75rem; min-width: 80px; text-align: right;">${timeOffset} mins ago</div>
                                </div>
                            `;
                        } else if (rul <= 50) {
                            logHtml += `
                                <div style="background: var(--panel-bg); border-left: 4px solid var(--accent-warning); padding: 1.25rem; border-radius: 4px; display: flex; justify-content: space-between; align-items: center; box-shadow: 0 4px 6px rgba(0,0,0,0.1);">
                                    <div>
                                        <div style="color: var(--accent-warning); font-weight: 600; margin-bottom: 4px;">WARNING: Engine #${eng.id} degraded below operational threshold</div>
                                        <div style="color: var(--text-muted); font-size: 0.875rem;">Maintenance scheduling required. Estimated RUL: <span style="color:#fff; font-weight:600">${rul}</span> cycles.</div>
                                    </div>
                                    <div style="color: var(--text-muted); font-size: 0.75rem; min-width: 80px; text-align: right;">${timeOffset + 60} mins ago</div>
                                </div>
                            `;
                        }
                    });
                    
                    container.innerHTML = logHtml || '<p style="color: var(--text-muted);">No system alerts. Fleet is healthy.</p>';
                }
            } catch (e) {
                console.error("Failed to load alerts data", e);
            }
        }
        
        // Auto-load Engine 1 on startup
        window.onload = () => {
            fetchEngineData();
        };
    </script>
</body>
</html>