const fullData = [
    { x: new Date('2025-04-09'), y: 4616.92 },
    { x: new Date('2025-04-10'), y: 4595.57 },
    { x: new Date('2025-04-11'), y: 4587.18 },
    { x: new Date('2025-04-12'), y: 4573.39 },
    { x: new Date('2025-04-13'), y: 4574.86 },
    { x: new Date('2025-04-14'), y: 4579.26 },
    { x: new Date('2025-04-15'), y: 4569.23 },
    { x: new Date('2025-04-16'), y: 4581.80 },
    { x: new Date('2025-04-17'), y: 4575.70 },
    { x: new Date('2025-04-18'), y: 4592.77 },
    { x: new Date('2025-04-19'), y: 4590.45 },
    { x: new Date('2025-04-20'), y: 4590.71 },
    { x: new Date('2025-04-21'), y: 4588.92 },
    { x: new Date('2025-04-22'), y: 4584.34 },
    { x: new Date('2025-04-23'), y: 4592.49 },
    { x: new Date('2025-04-24'), y: 4596.80 },
    { x: new Date('2025-04-26'), y: 4588.35 },
    { x: new Date('2025-04-27'), y: 4588.31 },
    { x: new Date('2025-04-28'), y: 4584.65 },
    { x: new Date('2025-05-02'), y: 4528.69 },
    { x: new Date('2025-05-05'), y: 4486.58 },
    { x: new Date('2025-05-06'), y: 4486.58 },
    { x: new Date('2025-05-08'), y: 4476.56 },
    { x: new Date('2025-05-09'), y: 4502.87 },
    { x: new Date('2025-05-10'), y: 4508.00 },
    { x: new Date('2025-05-11'), y: 4506.04 },
    { x: new Date('2025-05-12'), y: 4507.02 },
    { x: new Date('2025-05-13'), y: 4518.62 },
    { x: new Date('2025-05-14'), y: 4507.90 },
    { x: new Date('2025-05-15'), y: 4513.91 },
    { x: new Date('2025-05-16'), y: 4494.40 },
    { x: new Date('2025-05-17'), y: 4484.02 },
    { x: new Date('2025-05-19'), y: 4486.91 },
    { x: new Date('2025-05-20'), y: 4479.10 },
    { x: new Date('2025-05-21'), y: 4471.22 },
    { x: new Date('2025-05-22'), y: 4464.58 },
    { x: new Date('2025-05-24'), y: 4419.29 },
    { x: new Date('2025-05-26'), y: 4422.64 },
    { x: new Date('2025-05-27'), y: 4419.99 },
    { x: new Date('2025-06-04'), y: 4444.92 },
    { x: new Date('2025-06-05'), y: 4438.80 },
    { x: new Date('2025-06-06'), y: 4429.66 },
    { x: new Date('2025-06-07'), y: 4439.33 },
    { x: new Date('2025-06-08'), y: 4438.39 },
    { x: new Date('2025-06-10'), y: 4434.67 },
    { x: new Date('2025-06-11'), y: 4430.99 },
    { x: new Date('2025-06-12'), y: 4429.99 },
    { x: new Date('2025-06-13'), y: 4418.96 },
    { x: new Date('2025-06-14'), y: 4444.58 },
    { x: new Date('2025-06-15'), y: 4443.27 },
    { x: new Date('2025-06-16'), y: 4439.35 },
    { x: new Date('2025-06-17'), y: 4437.71 },
    { x: new Date('2025-06-18'), y: 4436.44 },
    { x: new Date('2025-06-20'), y: 4461.48 },
    { x: new Date('2025-06-21'), y: 4463.75 },
    { x: new Date('2025-06-22'), y: 4466.12 },
    { x: new Date('2025-06-23'), y: 4467.61 },
    { x: new Date('2025-06-24'), y: 4492.72 },
    { x: new Date('2025-06-25'), y: 4445.21 },
    { x: new Date('2025-06-26'), y: 4441.91 },
    { x: new Date('2025-06-27'), y: 4415.65 },
    { x: new Date('2025-06-28'), y: 4421.84 },
    { x: new Date('2025-06-29'), y: 4420.99 },
    { x: new Date('2025-06-30'), y: 4419.37 },
    { x: new Date('2025-07-01'), y: 4415.09 },
    { x: new Date('2025-07-02'), y: 4415.17 },
    { x: new Date('2025-07-04'), y: 4411.98 },
    { x: new Date('2025-07-05'), y: 4410.75 },
    { x: new Date('2025-07-06'), y: 4410.28 },
    { x: new Date('2025-07-07'), y: 4410.65 },
    { x: new Date('2025-07-08'), y: 4426.33 },
    { x: new Date('2025-07-09'), y: 4428.23 },
    { x: new Date('2025-07-10'), y: 4428.52 },
    { x: new Date('2025-07-12'), y: 4420.75 },
    { x: new Date('2025-07-13'), y: 4420.65 },
    { x: new Date('2025-07-14'), y: 4421.66 },
    { x: new Date('2025-07-16'), y: 4433.14 },
    { x: new Date('2025-07-17'), y: 4439.32 },
    { x: new Date('2025-07-19'), y: 4439.65 },
    { x: new Date('2025-07-20'), y: 4443.13 },
    { x: new Date('2025-07-21'), y: 4438.38 },
    { x: new Date('2025-07-22'), y: 4442.35 },
    { x: new Date('2025-07-23'), y: 4435.04 },
    { x: new Date('2025-07-24'), y: 4430.45 },
    { x: new Date('2025-07-25'), y: 4433.87 },
    { x: new Date('2025-07-26'), y: 4448.48 },
    { x: new Date('2025-07-27'), y: 4447.49 },
    { x: new Date('2025-07-29'), y: 4458.23 },
    { x: new Date('2025-07-30'), y: 4463.55 },
    { x: new Date('2025-07-31'), y: 4473.75 },
    { x: new Date('2025-08-01'), y: 4488.45 },
    { x: new Date('2025-08-02'), y: 4476.93 },
    { x: new Date('2025-08-03'), y: 4480.67 },
    { x: new Date('2025-08-04'), y: 4476.27 },
    { x: new Date('2025-08-05'), y: 4461.95 },
    { x: new Date('2025-08-06'), y: 4462.78 },
    { x: new Date('2025-08-07'), y: 4454.96 },
    { x: new Date('2025-08-08'), y: 4443.77 },
    { x: new Date('2025-08-09'), y: 4438.92 },
    { x: new Date('2025-08-10'), y: 4437.63 },
    { x: new Date('2025-08-11'), y: 4433.34 },
    { x: new Date('2025-08-12'), y: 4433.41 },
    { x: new Date('2025-08-13'), y: 4429.58 },
    { x: new Date('2025-08-14'), y: 4395.44 },
    { x: new Date('2025-08-15'), y: 4393.75 },
    { x: new Date('2025-08-16'), y: 4400.76 },
    { x: new Date('2025-08-18'), y: 4407.32 },
    { x: new Date('2025-08-19'), y: 4414.25 },
    { x: new Date('2025-08-20'), y: 4430.32 },
    { x: new Date('2025-08-21'), y: 4435.10 },
    { x: new Date('2025-08-22'), y: 4445.23 },
    { x: new Date('2025-08-23'), y: 4438.23 },
    { x: new Date('2025-08-24'), y: 4437.28 },
    { x: new Date('2025-08-25'), y: 4437.26 },
    { x: new Date('2025-08-26'), y: 4428.68 },
    { x: new Date('2025-08-27'), y: 4438.47 },
    { x: new Date('2025-08-28'), y: 4464.14 },
    { x: new Date('2025-08-29'), y: 4452.23 },
    { x: new Date('2025-08-30'), y: 4488.68 },
    { x: new Date('2025-08-31'), y: 4485.87 }];

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);