// Usage analytics functionality
document.addEventListener('DOMContentLoaded', function() {
    initUsageChart();
});

// Initialize usage chart
function initUsageChart() {
    const ctx = document.getElementById('usage-chart').getContext('2d');
    
    // Generate sample data for last 30 days
    const labels = [];
    const data = [];
    const threats = [];
    
    for (let i = 29; i >= 0; i--) {
        const date = new Date();
        date.setDate(date.getDate() - i);
        labels.push(date.toLocaleDateString('en-US', { month: 'short', day: 'numeric' }));
        
        // Generate realistic usage data
        const baseUsage = 80 + Math.random() * 40;
        const weekendFactor = (date.getDay() === 0 || date.getDay() === 6) ? 0.6 : 1;
        const dailyUsage = Math.floor(baseUsage * weekendFactor);
        data.push(dailyUsage);
        threats.push(Math.floor(dailyUsage * 0.4 + Math.random() * 20));
    }

    new Chart(ctx, {
        type: 'line',
        data: {
            labels: labels,
            datasets: [
                {
                    label: 'Documents Processed',
                    data: data,
                    borderColor: '#3b82f6',
                    backgroundColor: 'rgba(59, 130, 246, 0.1)',
                    fill: true,
                    tension: 0.4
                },
                {
                    label: 'Threats Removed',
                    data: threats,
                    borderColor: '#ef4444',
                    backgroundColor: 'rgba(239, 68, 68, 0.1)',
                    fill: true,
                    tension: 0.4
                }
            ]
        },
        options: {
            responsive: true,
            maintainAspectRatio: false,
            plugins: {
                legend: {
                    position: 'top',
                }
            },
            scales: {
                y: {
                    beginAtZero: true,
                    grid: {
                        color: 'rgba(0, 0, 0, 0.1)'
                    }
                },
                x: {
                    grid: {
                        color: 'rgba(0, 0, 0, 0.1)'
                    }
                }
            },
            elements: {
                point: {
                    radius: 3,
                    hoverRadius: 6
                }
            }
        }
    });
}

// Export usage data
function exportUsageData() {
    const usageData = {
        period: 'Last 30 days',
        documentsProcessed: 2847,
        threatsRemoved: 1423,
        averageProcessingTime: 2.3,
        dataCleaned: '847 MB',
        threatBreakdown: {
            'Zero-width characters': 687,
            'Embedded JavaScript': 423,
            'LSB steganography': 189,
            'VBA macros': 124
        },
        fileTypeBreakdown: {
            'PDF': 1245,
            'DOCX': 867,
            'Images': 432,
            'PPTX': 203,
            'Other': 100
        }
    };

    const csvContent = [
        'Metric,Value',
        `Documents Processed,${usageData.documentsProcessed}`,
        `Threats Removed,${usageData.threatsRemoved}`,
        `Average Processing Time,${usageData.averageProcessingTime}s`,
        `Data Cleaned,${usageData.dataCleaned}`,
        '',
        'Threat Types,Count',
        ...Object.entries(usageData.threatBreakdown).map(([type, count]) => `${type},${count}`),
        '',
        'File Types,Count',
        ...Object.entries(usageData.fileTypeBreakdown).map(([type, count]) => `${type},${count}`)
    ].join('\n');

    const blob = new Blob([csvContent], { type: 'text/csv' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    a.download = `wash-usage-${new Date().toISOString().split('T')[0]}.csv`;
    document.body.appendChild(a);
    a.click();
    document.body.removeChild(a);
    URL.revokeObjectURL(url);

    Wash.showNotification('Usage data exported successfully', 'success');
}

// Format number with commas
function formatNumber(num) {
    return num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
}

// Calculate percentage change
function calculatePercentageChange(current, previous) {
    if (previous === 0) return current > 0 ? 100 : 0;
    return ((current - previous) / previous * 100).toFixed(1);
}