document.addEventListener('DOMContentLoaded', function() {
    // Initialize Chart
    const ctx = document.getElementById('hashrateChart').getContext('2d');
    const hashrateChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: [],
            datasets: [{
                label: 'Hashrate (MH/s)',
                data: [],
                borderColor: '#0d6efd',
                backgroundColor: 'rgba(13, 110, 253, 0.1)',
                borderWidth: 2,
                fill: true,
                tension: 0.4
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    display: false
                }
            },
            scales: {
                x: {
                    grid: { color: '#333' },
                    ticks: { color: '#aaa' }
                },
                y: {
                    grid: { color: '#333' },
                    ticks: { color: '#aaa' },
                    beginAtZero: true
                }
            }
        }
    });

    // Helper to format large numbers
    function formatNumber(num) {
        return num.toString().replace(/(\d)(?=(\d{3})+(?!\d))/g, '$1,');
    }

    function updateDashboard() {
        fetch('/api/data')
            .then(response => response.json())
            .then(data => {
                const summary = data.summary;
                const devs = data.devs;
                const pools = data.pools;

                // Update Top Stats
                if (summary) {
                    // Cgminer returns MHS in different fields depending on version, usually "MHS 5s" or similar
                    // The API returns dict keys.
                    // Let's inspect typical cgminer summary keys: "MHS av", "MHS 5s", "Accepted", "Hardware Errors", "Utility"
                    
                    const mhs = summary['MHS 5s'] || summary['MHS av'] || 0;
                    document.getElementById('stat-mhs').innerText = parseFloat(mhs).toFixed(2);
                    document.getElementById('stat-accepted').innerText = formatNumber(summary['Accepted'] || 0);
                    document.getElementById('stat-hw').innerText = formatNumber(summary['Hardware Errors'] || 0);
                }

                // Update Max Temp
                let maxTemp = 0;
                if (devs && devs.length > 0) {
                    devs.forEach(dev => {
                        if (dev['Temperature'] > maxTemp) maxTemp = dev['Temperature'];
                    });
                }
                document.getElementById('stat-temp').innerText = maxTemp.toFixed(1);

                // Update Chart
                const now = new Date();
                const timeLabel = now.getHours() + ':' + String(now.getMinutes()).padStart(2, '0') + ':' + String(now.getSeconds()).padStart(2, '0');
                
                if (summary) {
                    const currentMhs = summary['MHS 5s'] || summary['MHS av'] || 0;
                    
                    if (hashrateChart.data.labels.length > 60) { // Keep last 60 points
                        hashrateChart.data.labels.shift();
                        hashrateChart.data.datasets[0].data.shift();
                    }
                    hashrateChart.data.labels.push(timeLabel);
                    hashrateChart.data.datasets[0].data.push(currentMhs);
                    hashrateChart.update();
                }

                // Update Devs Table
                const tbody = document.getElementById('devs-table-body');
                tbody.innerHTML = '';
                if (devs && devs.length > 0) {
                    devs.forEach(dev => {
                        const tr = document.createElement('tr');
                        tr.innerHTML = `
                            <td>${dev['ID']}</td>
                            <td>${dev['Name'] || 'Gridseed'}</td>
                            <td>${dev['Enabled']}</td>
                            <td>${dev['Status']}</td>
                            <td class="${dev['Temperature'] > 50 ? 'text-warning' : 'text-success'}">${dev['Temperature']}</td>
                            <td>${parseFloat(dev['MHS 5s'] || 0).toFixed(2)}</td>
                            <td>${parseFloat(dev['MHS av'] || 0).toFixed(2)}</td>
                            <td>${dev['Accepted']}</td>
                            <td>${dev['Rejected']}</td>
                            <td>${dev['Hardware Errors']}</td>
                        `;
                        tbody.appendChild(tr);
                    });
                } else {
                    tbody.innerHTML = '<tr><td colspan="10" class="text-center text-muted">Keine Geräte gefunden...</td></tr>';
                }

                // Update Pools
                const poolList = document.getElementById('pool-list');
                poolList.innerHTML = '';
                if (pools && pools.length > 0) {
                    pools.forEach(pool => {
                        const div = document.createElement('div');
                        div.className = 'list-group-item bg-dark text-white border-secondary d-flex justify-content-between align-items-center';
                        div.innerHTML = `
                            <div>
                                <div class="fw-bold">Pool ${pool['POOL']}</div>
                                <small class="text-muted">${pool['URL']}</small>
                            </div>
                            <span class="badge ${pool['Status'] === 'Alive' ? 'bg-success' : 'bg-danger'} rounded-pill">${pool['Status']}</span>
                        `;
                        poolList.appendChild(div);
                    });
                } else {
                    poolList.innerHTML = '<div class="text-center text-muted">Keine Pools konfiguriert...</div>';
                }

            })
            .catch(err => console.error('Error fetching data:', err));
    }

    // Update every 3 seconds
    setInterval(updateDashboard, 3000);
    updateDashboard(); // Initial call
});