const fullData = [
    { x: new Date('2025-04-09'), y: 1686.59 },
    { x: new Date('2025-04-10'), y: 1688.02 },
    { x: new Date('2025-04-11'), y: 1701.62 },
    { x: new Date('2025-04-12'), y: 1705.97 },
    { x: new Date('2025-04-13'), y: 1707.46 },
    { x: new Date('2025-04-14'), y: 1717.71 },
    { x: new Date('2025-04-15'), y: 1722.53 },
    { x: new Date('2025-04-16'), y: 1711.30 },
    { x: new Date('2025-04-17'), y: 1716.87 },
    { x: new Date('2025-04-18'), y: 1740.95 },
    { x: new Date('2025-04-19'), y: 1747.13 },
    { x: new Date('2025-04-20'), y: 1746.47 },
    { x: new Date('2025-04-21'), y: 1758.27 },
    { x: new Date('2025-04-22'), y: 1766.05 },
    { x: new Date('2025-04-23'), y: 1762.66 },
    { x: new Date('2025-04-24'), y: 1751.71 },
    { x: new Date('2025-04-26'), y: 1742.37 },
    { x: new Date('2025-04-27'), y: 1742.04 },
    { x: new Date('2025-04-28'), y: 1735.96 },
    { x: new Date('2025-05-02'), y: 1709.27 },
    { x: new Date('2025-05-05'), y: 1705.22 },
    { x: new Date('2025-05-06'), y: 1705.22 },
    { x: new Date('2025-05-08'), y: 1713.16 },
    { x: new Date('2025-05-09'), y: 1703.22 },
    { x: new Date('2025-05-10'), y: 1706.56 },
    { x: new Date('2025-05-11'), y: 1706.13 },
    { x: new Date('2025-05-12'), y: 1701.39 },
    { x: new Date('2025-05-13'), y: 1681.33 },
    { x: new Date('2025-05-14'), y: 1697.46 },
    { x: new Date('2025-05-15'), y: 1705.79 },
    { x: new Date('2025-05-16'), y: 1694.44 },
    { x: new Date('2025-05-17'), y: 1682.32 },
    { x: new Date('2025-05-19'), y: 1687.51 },
    { x: new Date('2025-05-20'), y: 1696.41 },
    { x: new Date('2025-05-21'), y: 1698.95 },
    { x: new Date('2025-05-22'), y: 1713.54 },
    { x: new Date('2025-05-24'), y: 1699.34 },
    { x: new Date('2025-05-26'), y: 1695.38 },
    { x: new Date('2025-05-27'), y: 1703.18 },
    { x: new Date('2025-06-04'), y: 1697.46 },
    { x: new Date('2025-06-05'), y: 1698.78 },
    { x: new Date('2025-06-06'), y: 1700.31 },
    { x: new Date('2025-06-07'), y: 1696.23 },
    { x: new Date('2025-06-08'), y: 1696.65 },
    { x: new Date('2025-06-10'), y: 1695.64 },
    { x: new Date('2025-06-11'), y: 1697.21 },
    { x: new Date('2025-06-12'), y: 1699.63 },
    { x: new Date('2025-06-13'), y: 1717.42 },
    { x: new Date('2025-06-14'), y: 1718.35 },
    { x: new Date('2025-06-15'), y: 1717.29 },
    { x: new Date('2025-06-16'), y: 1715.65 },
    { x: new Date('2025-06-17'), y: 1720.06 },
    { x: new Date('2025-06-18'), y: 1707.04 },
    { x: new Date('2025-06-20'), y: 1699.54 },
    { x: new Date('2025-06-21'), y: 1696.07 },
    { x: new Date('2025-06-22'), y: 1696.13 },
    { x: new Date('2025-06-23'), y: 1691.89 },
    { x: new Date('2025-06-24'), y: 1701.25 },
    { x: new Date('2025-06-25'), y: 1713.86 },
    { x: new Date('2025-06-26'), y: 1716.65 },
    { x: new Date('2025-06-27'), y: 1710.50 },
    { x: new Date('2025-06-28'), y: 1711.86 },
    { x: new Date('2025-06-29'), y: 1711.47 },
    { x: new Date('2025-06-30'), y: 1711.78 },
    { x: new Date('2025-07-01'), y: 1711.07 },
    { x: new Date('2025-07-02'), y: 1711.87 },
    { x: new Date('2025-07-04'), y: 1690.93 },
    { x: new Date('2025-07-05'), y: 1693.96 },
    { x: new Date('2025-07-06'), y: 1694.06 },
    { x: new Date('2025-07-07'), y: 1693.57 },
    { x: new Date('2025-07-08'), y: 1706.91 },
    { x: new Date('2025-07-09'), y: 1705.67 },
    { x: new Date('2025-07-10'), y: 1707.66 },
    { x: new Date('2025-07-12'), y: 1701.49 },
    { x: new Date('2025-07-13'), y: 1700.89 },
    { x: new Date('2025-07-14'), y: 1700.90 },
    { x: new Date('2025-07-16'), y: 1678.28 },
    { x: new Date('2025-07-17'), y: 1674.32 },
    { x: new Date('2025-07-19'), y: 1687.35 },
    { x: new Date('2025-07-20'), y: 1686.61 },
    { x: new Date('2025-07-21'), y: 1686.73 },
    { x: new Date('2025-07-22'), y: 1699.68 },
    { x: new Date('2025-07-23'), y: 1705.93 },
    { x: new Date('2025-07-24'), y: 1709.88 },
    { x: new Date('2025-07-25'), y: 1709.11 },
    { x: new Date('2025-07-26'), y: 1712.72 },
    { x: new Date('2025-07-27'), y: 1712.88 },
    { x: new Date('2025-07-29'), y: 1705.22 },
    { x: new Date('2025-07-30'), y: 1698.09 },
    { x: new Date('2025-07-31'), y: 1685.17 },
    { x: new Date('2025-08-01'), y: 1686.72 },
    { x: new Date('2025-08-02'), y: 1692.84 },
    { x: new Date('2025-08-03'), y: 1690.46 },
    { x: new Date('2025-08-04'), y: 1699.42 },
    { x: new Date('2025-08-05'), y: 1694.95 },
    { x: new Date('2025-08-06'), y: 1694.25 },
    { x: new Date('2025-08-07'), y: 1699.07 },
    { x: new Date('2025-08-08'), y: 1702.59 },
    { x: new Date('2025-08-09'), y: 1702.39 },
    { x: new Date('2025-08-10'), y: 1700.56 },
    { x: new Date('2025-08-11'), y: 1698.24 },
    { x: new Date('2025-08-12'), y: 1687.46 },
    { x: new Date('2025-08-13'), y: 1696.16 },
    { x: new Date('2025-08-14'), y: 1696.64 },
    { x: new Date('2025-08-15'), y: 1682.05 },
    { x: new Date('2025-08-16'), y: 1684.64 },
    { x: new Date('2025-08-18'), y: 1690.96 },
    { x: new Date('2025-08-19'), y: 1691.11 },
    { x: new Date('2025-08-20'), y: 1698.60 },
    { x: new Date('2025-08-21'), y: 1697.58 },
    { x: new Date('2025-08-22'), y: 1698.11 },
    { x: new Date('2025-08-23'), y: 1708.53 },
    { x: new Date('2025-08-24'), y: 1706.22 },
    { x: new Date('2025-08-25'), y: 1698.93 },
    { x: new Date('2025-08-26'), y: 1702.43 },
    { x: new Date('2025-08-27'), y: 1702.91 },
    { x: new Date('2025-08-28'), y: 1715.52 },
    { x: new Date('2025-08-29'), y: 1723.99 },
    { x: new Date('2025-08-30'), y: 1742.62 },
    { x: new Date('2025-08-31'), y: 1741.31 }];

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);