const fullData = [
    { x: new Date('2025-04-09'), y: 1545.80 },
    { x: new Date('2025-04-10'), y: 1550.94 },
    { x: new Date('2025-04-11'), y: 1557.51 },
    { x: new Date('2025-04-12'), y: 1567.11 },
    { x: new Date('2025-04-13'), y: 1568.99 },
    { x: new Date('2025-04-14'), y: 1572.05 },
    { x: new Date('2025-04-15'), y: 1585.82 },
    { x: new Date('2025-04-16'), y: 1585.07 },
    { x: new Date('2025-04-17'), y: 1584.85 },
    { x: new Date('2025-04-18'), y: 1603.65 },
    { x: new Date('2025-04-19'), y: 1604.88 },
    { x: new Date('2025-04-20'), y: 1604.89 },
    { x: new Date('2025-04-21'), y: 1610.23 },
    { x: new Date('2025-04-22'), y: 1619.94 },
    { x: new Date('2025-04-23'), y: 1623.15 },
    { x: new Date('2025-04-24'), y: 1613.13 },
    { x: new Date('2025-04-26'), y: 1615.97 },
    { x: new Date('2025-04-27'), y: 1616.28 },
    { x: new Date('2025-04-28'), y: 1614.79 },
    { x: new Date('2025-05-02'), y: 1594.74 },
    { x: new Date('2025-05-05'), y: 1585.39 },
    { x: new Date('2025-05-06'), y: 1585.39 },
    { x: new Date('2025-05-08'), y: 1594.67 },
    { x: new Date('2025-05-09'), y: 1588.56 },
    { x: new Date('2025-05-10'), y: 1596.77 },
    { x: new Date('2025-05-11'), y: 1595.59 },
    { x: new Date('2025-05-12'), y: 1592.86 },
    { x: new Date('2025-05-13'), y: 1583.30 },
    { x: new Date('2025-05-14'), y: 1591.52 },
    { x: new Date('2025-05-15'), y: 1601.02 },
    { x: new Date('2025-05-16'), y: 1584.12 },
    { x: new Date('2025-05-17'), y: 1581.48 },
    { x: new Date('2025-05-19'), y: 1584.38 },
    { x: new Date('2025-05-20'), y: 1594.30 },
    { x: new Date('2025-05-21'), y: 1596.33 },
    { x: new Date('2025-05-22'), y: 1614.83 },
    { x: new Date('2025-05-24'), y: 1600.25 },
    { x: new Date('2025-05-26'), y: 1596.55 },
    { x: new Date('2025-05-27'), y: 1605.03 },
    { x: new Date('2025-06-04'), y: 1609.14 },
    { x: new Date('2025-06-05'), y: 1612.23 },
    { x: new Date('2025-06-06'), y: 1615.22 },
    { x: new Date('2025-06-07'), y: 1614.64 },
    { x: new Date('2025-06-08'), y: 1614.55 },
    { x: new Date('2025-06-10'), y: 1617.21 },
    { x: new Date('2025-06-11'), y: 1612.68 },
    { x: new Date('2025-06-12'), y: 1613.51 },
    { x: new Date('2025-06-13'), y: 1628.73 },
    { x: new Date('2025-06-14'), y: 1644.77 },
    { x: new Date('2025-06-15'), y: 1643.17 },
    { x: new Date('2025-06-16'), y: 1641.83 },
    { x: new Date('2025-06-17'), y: 1645.00 },
    { x: new Date('2025-06-18'), y: 1637.59 },
    { x: new Date('2025-06-20'), y: 1631.41 },
    { x: new Date('2025-06-21'), y: 1623.41 },
    { x: new Date('2025-06-22'), y: 1623.60 },
    { x: new Date('2025-06-23'), y: 1622.89 },
    { x: new Date('2025-06-24'), y: 1632.79 },
    { x: new Date('2025-06-25'), y: 1616.23 },
    { x: new Date('2025-06-26'), y: 1609.48 },
    { x: new Date('2025-06-27'), y: 1609.08 },
    { x: new Date('2025-06-28'), y: 1611.26 },
    { x: new Date('2025-06-29'), y: 1611.10 },
    { x: new Date('2025-06-30'), y: 1610.66 },
    { x: new Date('2025-07-01'), y: 1609.46 },
    { x: new Date('2025-07-02'), y: 1611.52 },
    { x: new Date('2025-07-04'), y: 1607.22 },
    { x: new Date('2025-07-05'), y: 1607.82 },
    { x: new Date('2025-07-06'), y: 1607.63 },
    { x: new Date('2025-07-07'), y: 1609.23 },
    { x: new Date('2025-07-08'), y: 1605.39 },
    { x: new Date('2025-07-09'), y: 1609.28 },
    { x: new Date('2025-07-10'), y: 1610.34 },
    { x: new Date('2025-07-12'), y: 1603.21 },
    { x: new Date('2025-07-13'), y: 1602.20 },
    { x: new Date('2025-07-14'), y: 1602.98 },
    { x: new Date('2025-07-16'), y: 1592.35 },
    { x: new Date('2025-07-17'), y: 1586.53 },
    { x: new Date('2025-07-19'), y: 1603.09 },
    { x: new Date('2025-07-20'), y: 1601.56 },
    { x: new Date('2025-07-21'), y: 1601.63 },
    { x: new Date('2025-07-22'), y: 1603.86 },
    { x: new Date('2025-07-23'), y: 1609.73 },
    { x: new Date('2025-07-24'), y: 1610.48 },
    { x: new Date('2025-07-25'), y: 1609.84 },
    { x: new Date('2025-07-26'), y: 1606.55 },
    { x: new Date('2025-07-27'), y: 1606.84 },
    { x: new Date('2025-07-29'), y: 1605.04 },
    { x: new Date('2025-07-30'), y: 1604.73 },
    { x: new Date('2025-07-31'), y: 1599.81 },
    { x: new Date('2025-08-01'), y: 1598.15 },
    { x: new Date('2025-08-02'), y: 1600.20 },
    { x: new Date('2025-08-03'), y: 1598.95 },
    { x: new Date('2025-08-04'), y: 1603.00 },
    { x: new Date('2025-08-05'), y: 1596.07 },
    { x: new Date('2025-08-06'), y: 1596.99 },
    { x: new Date('2025-08-07'), y: 1604.08 },
    { x: new Date('2025-08-08'), y: 1596.98 },
    { x: new Date('2025-08-09'), y: 1588.39 },
    { x: new Date('2025-08-10'), y: 1587.88 },
    { x: new Date('2025-08-11'), y: 1584.99 },
    { x: new Date('2025-08-12'), y: 1588.29 },
    { x: new Date('2025-08-13'), y: 1589.97 },
    { x: new Date('2025-08-14'), y: 1584.93 },
    { x: new Date('2025-08-15'), y: 1575.30 },
    { x: new Date('2025-08-16'), y: 1581.36 },
    { x: new Date('2025-08-18'), y: 1589.07 },
    { x: new Date('2025-08-19'), y: 1587.28 },
    { x: new Date('2025-08-20'), y: 1585.28 },
    { x: new Date('2025-08-21'), y: 1589.24 },
    { x: new Date('2025-08-22'), y: 1602.33 },
    { x: new Date('2025-08-23'), y: 1614.17 },
    { x: new Date('2025-08-24'), y: 1611.76 },
    { x: new Date('2025-08-25'), y: 1603.93 },
    { x: new Date('2025-08-26'), y: 1608.21 },
    { x: new Date('2025-08-27'), y: 1606.82 },
    { x: new Date('2025-08-28'), y: 1620.22 },
    { x: new Date('2025-08-29'), y: 1624.26 },
    { x: new Date('2025-08-30'), y: 1640.76 },
    { x: new Date('2025-08-31'), y: 1639.45 }];

const options = {
    chart: {
        type: 'area',
        height: 300,
        toolbar: { show: false },
        zoom: { enabled: false }
    },
    series: [{ name: '', data: fullData }],
    xaxis: {
        type: 'datetime'
    },
    yaxis: {
        tickAmount: 7,
        labels: {
            formatter: val => `${val.toLocaleString('id-ID')}`,
            offsetX: -17
        }
    },
    grid: {
        padding: {
            left: -10,
            right: 0
        }
    },
    tooltip: {
        x: { format: 'dd MMM yyyy' },
        y: {
            formatter: val => `Rp ${val.toLocaleString('id-ID')}`
        }
    },
    stroke: {
        curve: 'smooth',
        width: 2
    },
    fill: {
        type: 'gradient',
        gradient: {
            shadeIntensity: 1,
            opacityFrom: 0.8,
            opacityTo: 0,
            stops: [0, 90, 100]
        }
    },
    colors: ['#007bff'],
    legend: { show: false },
    dataLabels: { enabled: false }
};

const chart = new ApexCharts(document.querySelector("#chart"), options);
chart.render();

function updateChart(months) {
    const sortedData = [...fullData].sort((a, b) => a.x - b.x);
    const latestDate = sortedData[sortedData.length - 1].x;
    const start = new Date(latestDate);
    start.setMonth(start.getMonth() - months);

    const filtered = fullData.filter(item => item.x >= start && item.x <= latestDate);
    chart.updateSeries([{ name: '', data: filtered }]);
}

document.querySelectorAll('.filter-btn').forEach(btn => {
    btn.addEventListener('click', () => {
        document.querySelectorAll('.filter-btn').forEach(b => b.classList.remove('active'));
        btn.classList.add('active');
        const months = parseInt(btn.dataset.months);
        updateChart(months);
    });
});
updateChart(1);