const fullData = [
    { x: new Date('2025-04-09'), y: 295.11 },
    { x: new Date('2025-04-10'), y: 294.46 },
    { x: new Date('2025-04-11'), y: 293.57 },
    { x: new Date('2025-04-12'), y: 295.22 },
    { x: new Date('2025-04-13'), y: 295.15 },
    { x: new Date('2025-04-14'), y: 294.99 },
    { x: new Date('2025-04-15'), y: 294.37 },
    { x: new Date('2025-04-16'), y: 296.34 },
    { x: new Date('2025-04-17'), y: 296.87 },
    { x: new Date('2025-04-18'), y: 297.11 },
    { x: new Date('2025-04-19'), y: 297.09 },
    { x: new Date('2025-04-20'), y: 297.03 },
    { x: new Date('2025-04-21'), y: 297.19 },
    { x: new Date('2025-04-22'), y: 297.17 },
    { x: new Date('2025-04-23'), y: 298.04 },
    { x: new Date('2025-04-24'), y: 298.23 },
    { x: new Date('2025-04-26'), y: 299.26 },
    { x: new Date('2025-04-27'), y: 299.29 },
    { x: new Date('2025-04-28'), y: 299.30 },
    { x: new Date('2025-05-02'), y: 297.35 },
    { x: new Date('2025-05-05'), y: 295.97 },
    { x: new Date('2025-05-06'), y: 295.97 },
    { x: new Date('2025-05-08'), y: 296.43 },
    { x: new Date('2025-05-09'), y: 296.65 },
    { x: new Date('2025-05-10'), y: 298.45 },
    { x: new Date('2025-05-11'), y: 298.28 },
    { x: new Date('2025-05-12'), y: 298.54 },
    { x: new Date('2025-05-13'), y: 298.24 },
    { x: new Date('2025-05-14'), y: 297.26 },
    { x: new Date('2025-05-15'), y: 296.35 },
    { x: new Date('2025-05-16'), y: 296.15 },
    { x: new Date('2025-05-17'), y: 295.22 },
    { x: new Date('2025-05-19'), y: 295.18 },
    { x: new Date('2025-05-20'), y: 294.98 },
    { x: new Date('2025-05-21'), y: 294.85 },
    { x: new Date('2025-05-22'), y: 294.03 },
    { x: new Date('2025-05-24'), y: 293.43 },
    { x: new Date('2025-05-26'), y: 293.24 },
    { x: new Date('2025-05-27'), y: 293.16 },
    { x: new Date('2025-06-04'), y: 293.00 },
    { x: new Date('2025-06-05'), y: 292.35 },
    { x: new Date('2025-06-06'), y: 292.35 },
    { x: new Date('2025-06-07'), y: 292.19 },
    { x: new Date('2025-06-08'), y: 292.16 },
    { x: new Date('2025-06-10'), y: 291.78 },
    { x: new Date('2025-06-11'), y: 291.23 },
    { x: new Date('2025-06-12'), y: 291.13 },
    { x: new Date('2025-06-13'), y: 291.28 },
    { x: new Date('2025-06-14'), y: 289.83 },
    { x: new Date('2025-06-15'), y: 289.86 },
    { x: new Date('2025-06-16'), y: 289.85 },
    { x: new Date('2025-06-17'), y: 288.84 },
    { x: new Date('2025-06-18'), y: 287.58 },
    { x: new Date('2025-06-20'), y: 285.87 },
    { x: new Date('2025-06-21'), y: 286.62 },
    { x: new Date('2025-06-22'), y: 286.67 },
    { x: new Date('2025-06-23'), y: 286.79 },
    { x: new Date('2025-06-24'), y: 286.65 },
    { x: new Date('2025-06-25'), y: 286.19 },
    { x: new Date('2025-06-26'), y: 287.34 },
    { x: new Date('2025-06-27'), y: 286.19 },
    { x: new Date('2025-06-28'), y: 286.76 },
    { x: new Date('2025-06-29'), y: 286.80 },
    { x: new Date('2025-06-30'), y: 286.78 },
    { x: new Date('2025-07-01'), y: 287.52 },
    { x: new Date('2025-07-02'), y: 287.80 },
    { x: new Date('2025-07-04'), y: 287.70 },
    { x: new Date('2025-07-05'), y: 286.84 },
    { x: new Date('2025-07-06'), y: 286.82 },
    { x: new Date('2025-07-07'), y: 286.79 },
    { x: new Date('2025-07-08'), y: 286.88 },
    { x: new Date('2025-07-09'), y: 287.46 },
    { x: new Date('2025-07-10'), y: 287.21 },
    { x: new Date('2025-07-12'), y: 287.00 },
    { x: new Date('2025-07-13'), y: 287.12 },
    { x: new Date('2025-07-14'), y: 287.22 },
    { x: new Date('2025-07-16'), y: 286.37 },
    { x: new Date('2025-07-17'), y: 285.77 },
    { x: new Date('2025-07-19'), y: 285.50 },
    { x: new Date('2025-07-20'), y: 285.87 },
    { x: new Date('2025-07-21'), y: 285.69 },
    { x: new Date('2025-07-22'), y: 285.83 },
    { x: new Date('2025-07-23'), y: 286.33 },
    { x: new Date('2025-07-24'), y: 286.94 },
    { x: new Date('2025-07-25'), y: 287.04 },
    { x: new Date('2025-07-26'), y: 286.02 },
    { x: new Date('2025-07-27'), y: 285.96 },
    { x: new Date('2025-07-29'), y: 286.35 },
    { x: new Date('2025-07-30'), y: 285.82 },
    { x: new Date('2025-07-31'), y: 284.25 },
    { x: new Date('2025-08-01'), y: 282.74 },
    { x: new Date('2025-08-02'), y: 283.22 },
    { x: new Date('2025-08-03'), y: 283.33 },
    { x: new Date('2025-08-04'), y: 284.23 },
    { x: new Date('2025-08-05'), y: 285.60 },
    { x: new Date('2025-08-06'), y: 284.62 },
    { x: new Date('2025-08-07'), y: 285.06 },
    { x: new Date('2025-08-08'), y: 285.39 },
    { x: new Date('2025-08-09'), y: 286.08 },
    { x: new Date('2025-08-10'), y: 285.97 },
    { x: new Date('2025-08-11'), y: 286.12 },
    { x: new Date('2025-08-12'), y: 285.33 },
    { x: new Date('2025-08-13'), y: 285.83 },
    { x: new Date('2025-08-14'), y: 284.44 },
    { x: new Date('2025-08-15'), y: 283.04 },
    { x: new Date('2025-08-16'), y: 283.09 },
    { x: new Date('2025-08-18'), y: 283.33 },
    { x: new Date('2025-08-19'), y: 284.02 },
    { x: new Date('2025-08-20'), y: 284.43 },
    { x: new Date('2025-08-21'), y: 285.29 },
    { x: new Date('2025-08-22'), y: 285.56 },
    { x: new Date('2025-08-23'), y: 287.59 },
    { x: new Date('2025-08-24'), y: 287.49 },
    { x: new Date('2025-08-25'), y: 288.14 },
    { x: new Date('2025-08-26'), y: 286.63 },
    { x: new Date('2025-08-27'), y: 286.20 },
    { x: new Date('2025-08-28'), y: 286.15 },
    { x: new Date('2025-08-29'), y: 286.94 },
    { x: new Date('2025-08-30'), y: 287.63 },
    { x: new Date('2025-08-31'), y: 287.74 }];

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);