class GPONDashboard {
    constructor() {
        this.updateInterval = 5000;
        this.init();
    }

    init() {
        this.updateCurrent();
        this.updateAlerts();
        
        setInterval(() => this.updateCurrent(), this.updateInterval);
        setInterval(() => this.updateAlerts(), 10000);
        
        console.log('[Dashboard] Initialized');
    }

    async updateCurrent() {
        try {
            const response = await fetch('/api/current');
            const data = await response.json();
            
            console.log('[Dashboard] Data received:', data);
            
            this.updateMetrics(data);
            this.updateDeviceInfo(data);
            this.updateStatus(data);
            
        } catch (error) {
            console.error('[Dashboard] Error:', error);
            this.updateStatus({ status: 'error' });
        }
    }

    updateMetrics(data) {
        if (data.rx_power !== undefined && data.rx_power !== null) {
            document.getElementById('rx-power').textContent = data.rx_power.toFixed(2);
            const rxPercent = ((data.rx_power + 30) / 22) * 100;
            const bar = document.getElementById('rx-power-bar');
            bar.style.width = Math.max(0, Math.min(100, rxPercent)) + '%';
            
            if (data.rx_power < -28) {
                bar.className = 'progress-bar bg-danger';
            } else if (data.rx_power < -25) {
                bar.className = 'progress-bar bg-warning';
            } else {
                bar.className = 'progress-bar bg-info';
            }
        }
        
        if (data.tx_power !== undefined && data.tx_power !== null) {
            document.getElementById('tx-power').textContent = data.tx_power.toFixed(2);
            const txPercent = ((data.tx_power + 5) / 10) * 100;
            document.getElementById('tx-power-bar').style.width = Math.max(0, Math.min(100, txPercent)) + '%';
        }
        
        if (data.temperature !== undefined && data.temperature !== null) {
            document.getElementById('temperature').textContent = data.temperature.toFixed(1);
            const tempPercent = (data.temperature / 100) * 100;
            const bar = document.getElementById('temp-bar');
            bar.style.width = Math.max(0, Math.min(100, tempPercent)) + '%';
            
            if (data.temperature > 80) {
                bar.className = 'progress-bar bg-danger';
            } else if (data.temperature > 60) {
                bar.className = 'progress-bar bg-warning';
            } else {
                bar.className = 'progress-bar bg-success';
            }
        }
        
        const uptimeElem = document.getElementById('uptime');
        if (uptimeElem) {
            if (data.uptime && data.uptime > 0) {
                const seconds = parseInt(data.uptime);
                const days = Math.floor(seconds / 86400);
                const hours = Math.floor((seconds % 86400) / 3600);
                const minutes = Math.floor((seconds % 3600) / 60);
                
                let uptimeStr = '';
                if (days > 0) uptimeStr += days + 'd ';
                if (hours > 0 || days > 0) uptimeStr += hours + 'h ';
                uptimeStr += minutes + 'm';
                
                uptimeElem.textContent = uptimeStr.trim();
            } else {
                uptimeElem.textContent = '--';
            }
        }
    }

    updateDeviceInfo(data) {
        this.setElementText('vendor-id', data.vendor_id);
        this.setElementText('model', data.model);
        this.setElementText('serial-number', data.serial_number);
        this.setElementText('version', data.version);
        this.setElementText('hw-version', data.hw_version);
        this.setElementText('mac-address', data.mac_address);
        this.setElementText('omcc-version', data.omcc_version);
        this.setElementText('olt-mode', data.olt_mode);
        this.setElementText('pon-mode', data.pon_mode);
        this.setElementText('lan-mode', data.lan_mode);
        this.setElementText('olt-vendor-info', data.olt_vendor_info);
        this.setElementText('olt-version-info', data.olt_version_info);       
        this.setElementText('rx-packets', (data.rx_packets || 0).toLocaleString('en-US'));
        this.setElementText('tx-packets', (data.tx_packets || 0).toLocaleString('en-US'));
        this.setElementText('fec-corrected', (data.fec_corrected || 0).toLocaleString('en-US'));
        this.setElementText('fec-uncorrected', (data.fec_uncorrected || 0).toLocaleString('en-US'));
        
        if (data.voltage !== undefined && data.voltage !== null) {
            this.setElementText('voltage', data.voltage.toFixed(2) + ' V');
        } else {
            this.setElementText('voltage', 'N/A');
        }
        
        if (data.tx_bias_current !== undefined && data.tx_bias_current !== null) {
            this.setElementText('tx-bias', data.tx_bias_current.toFixed(2) + ' mA');
        } else {
            this.setElementText('tx-bias', 'N/A');
        }
        
        const volumeElem = document.getElementById('data-volume-total');
        if (volumeElem) {
            if (data.rx_bytes && data.tx_bytes) {
                const totalBytes = parseInt(data.rx_bytes) + parseInt(data.tx_bytes);
                volumeElem.textContent = this.formatBytes(totalBytes);
            } else {
                volumeElem.textContent = '--';
            }
        }
        
        const statusElem = document.getElementById('device-status');
        if (statusElem) {
            if (data.status === 'online') {
                statusElem.innerHTML = '<i class="bi bi-check-circle-fill text-success"></i> Online';
            } else {
                statusElem.innerHTML = '<i class="bi bi-x-circle-fill text-danger"></i> Offline';
            }
        }
        
        const lastUpdateElem = document.getElementById('last-update');
        if (lastUpdateElem) {
            if (data.timestamp) {
                try {
                    const date = new Date(data.timestamp);
                    if (!isNaN(date.getTime())) {
                        lastUpdateElem.textContent = date.toLocaleTimeString('en-US');
                    } else {
                        lastUpdateElem.textContent = '--';
                    }
                } catch (e) {
                    console.error('[Dashboard] Timestamp error:', e);
                    lastUpdateElem.textContent = '--';
                }
            } else {
                lastUpdateElem.textContent = '--';
            }
        }
    }


    updateStatus(data) {
        const indicator = document.getElementById('status-indicator');
        if (!indicator) return;
        
        if (data.status === 'online') {
            indicator.innerHTML = '<i class="bi bi-circle-fill text-success"></i> Online';
        } else if (data.status === 'error') {
            indicator.innerHTML = '<i class="bi bi-circle-fill text-danger"></i> Error';
        } else {
            indicator.innerHTML = '<i class="bi bi-circle-fill text-warning"></i> Unknown';
        }
    }

    async updateAlerts() {
        try {
            const response = await fetch('/api/alerts');
            const alerts = await response.json();
            
            const container = document.getElementById('alerts-container');
            if (!container || !alerts || alerts.length === 0) return;
            
            container.innerHTML = '';
            
            alerts.forEach(alert => {
                const alertDiv = document.createElement('div');
                
                let alertClass = 'alert-warning';
                if (alert.severity === 'critical') alertClass = 'alert-danger';
                else if (alert.severity === 'info') alertClass = 'alert-info';
                
                alertDiv.className = `alert ${alertClass} alert-dismissible fade show`;
                
                const icon = alert.severity === 'critical' ? 'bi-exclamation-octagon' : 
                            (alert.severity === 'info' ? 'bi-info-circle' : 'bi-exclamation-triangle');
                
                let timestamp = '';
                if (alert.timestamp) {
                    try {
                        const date = new Date(alert.timestamp);
                        timestamp = date.toLocaleTimeString('en-US');
                    } catch (e) {}
                }
                
                const category = (alert.category || 'system').toUpperCase();
                
                alertDiv.innerHTML = `
                    <i class="bi ${icon}"></i>
                    <strong>${category}:</strong> ${alert.message}
                    ${timestamp ? `<small class="float-end">${timestamp}</small>` : ''}
                    <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
                `;
                
                container.appendChild(alertDiv);
            });
            
        } catch (error) {
            console.error('[Dashboard] Error updating alerts:', error);
        }
    }

    setElementText(id, value) {
        const elem = document.getElementById(id);
        if (elem) {
            elem.textContent = (value !== undefined && value !== null && value !== '') ? value : '--';
        }
    }

    formatBytes(bytes, decimals = 2) {
        if (bytes === 0) return '0 B';
        const k = 1024;
        const dm = decimals < 0 ? 0 : decimals;
        const sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB'];
        const i = Math.floor(Math.log(bytes) / Math.log(k));
        return parseFloat((bytes / Math.pow(k, i)).toFixed(dm)) + ' ' + sizes[i];
    }
}

document.addEventListener('DOMContentLoaded', () => {
    window.dashboard = new GPONDashboard();
});