// GigLez - Statistics Dashboard

let frequencyChart;
let timelineChart;

document.addEventListener('DOMContentLoaded', () => {
    // Load stats when stats section becomes active
    const statsSection = document.getElementById('stats-section');
    const observer = new MutationObserver(() => {
        if (statsSection.classList.contains('active')) {
            loadStatistics();
        }
    });

    observer.observe(statsSection, { attributes: true });
});

async function loadStatistics() {
    try {
        const response = await fetch('/api/v1/stats/summary');

        if (!response.ok) {
            console.error('Failed to load statistics');
            return;
        }

        const stats = await response.json();
        displayStatistics(stats);

    } catch (error) {
        console.error('Error loading statistics:', error);
        displayDefaultStats();
    }
}

function displayStatistics(stats) {
    // Update stat cards
    document.getElementById('stat-captures').textContent = formatNumber(stats.total_captures || 0);
    document.getElementById('stat-devices').textContent = formatNumber(stats.unique_devices || 0);
    document.getElementById('stat-coverage').textContent = formatCoverage(stats.coverage_area_km2 || 0);
    document.getElementById('stat-contributors').textContent = formatNumber(stats.total_contributors || 0);

    // Update charts
    updateFrequencyChart(stats.frequency_distribution || {});
    updateTimelineChart(stats.captures_timeline || []);
}

function displayDefaultStats() {
    // Display placeholder stats
    document.getElementById('stat-captures').textContent = '-';
    document.getElementById('stat-devices').textContent = '-';
    document.getElementById('stat-coverage').textContent = '-';
    document.getElementById('stat-contributors').textContent = '-';
}

function updateFrequencyChart(distribution) {
    const ctx = document.getElementById('frequency-chart').getContext('2d');

    // Prepare data
    const labels = Object.keys(distribution).map(freq => `${(freq / 1e6).toFixed(0)} MHz`);
    const data = Object.values(distribution);

    // Destroy existing chart
    if (frequencyChart) {
        frequencyChart.destroy();
    }

    // Create chart
    frequencyChart = new Chart(ctx, {
        type: 'bar',
        data: {
            labels: labels,
            datasets: [{
                label: 'Number of Captures',
                data: data,
                backgroundColor: [
                    'rgba(16, 185, 129, 0.7)',  // 315 MHz - Green
                    'rgba(59, 130, 246, 0.7)',   // 433 MHz - Blue
                    'rgba(245, 158, 11, 0.7)',   // 868 MHz - Orange
                    'rgba(239, 68, 68, 0.7)',    // 915 MHz - Red
                ],
                borderColor: [
                    'rgb(16, 185, 129)',
                    'rgb(59, 130, 246)',
                    'rgb(245, 158, 11)',
                    'rgb(239, 68, 68)',
                ],
                borderWidth: 2
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: true,
            plugins: {
                legend: {
                    display: false
                }
            },
            scales: {
                y: {
                    beginAtZero: true,
                    ticks: {
                        precision: 0
                    }
                }
            }
        }
    });
}

function updateTimelineChart(timeline) {
    const ctx = document.getElementById('timeline-chart').getContext('2d');

    // Prepare data
    const labels = timeline.map(item => new Date(item.date).toLocaleDateString());
    const data = timeline.map(item => item.count);

    // Destroy existing chart
    if (timelineChart) {
        timelineChart.destroy();
    }

    // Create chart
    timelineChart = new Chart(ctx, {
        type: 'line',
        data: {
            labels: labels,
            datasets: [{
                label: 'Captures per Day',
                data: data,
                borderColor: 'rgb(37, 99, 235)',
                backgroundColor: 'rgba(37, 99, 235, 0.1)',
                tension: 0.4,
                fill: true
            }]
        },
        options: {
            responsive: true,
            maintainAspectRatio: true,
            plugins: {
                legend: {
                    display: false
                }
            },
            scales: {
                y: {
                    beginAtZero: true,
                    ticks: {
                        precision: 0
                    }
                }
            }
        }
    });
}

function formatNumber(num) {
    if (num >= 1000000) {
        return (num / 1000000).toFixed(1) + 'M';
    }
    if (num >= 1000) {
        return (num / 1000).toFixed(1) + 'K';
    }
    return num.toString();
}

function formatCoverage(km2) {
    if (km2 === 0) {
        return 'N/A';
    }
    if (km2 >= 10000) {
        return (km2 / 10000).toFixed(1) + ' x 10K km²';
    }
    if (km2 >= 1000) {
        return (km2 / 1000).toFixed(1) + 'K km²';
    }
    return km2.toFixed(0) + ' km²';
}