const fullData = [
    { x: new Date('2025-04-09'), y: 9454.55 },
    { x: new Date('2025-04-10'), y: 9453.67 },
    { x: new Date('2025-04-11'), y: 9667.57 },
    { x: new Date('2025-04-12'), y: 9769.17 },
    { x: new Date('2025-04-13'), y: 9768.12 },
    { x: new Date('2025-04-14'), y: 9799.67 },
    { x: new Date('2025-04-15'), y: 9846.66 },
    { x: new Date('2025-04-16'), y: 9939.21 },
    { x: new Date('2025-04-17'), y: 9963.48 },
    { x: new Date('2025-04-18'), y: 10065.11 },
    { x: new Date('2025-04-19'), y: 10006.38 },
    { x: new Date('2025-04-20'), y: 10002.60 },
    { x: new Date('2025-04-21'), y: 10036.51 },
    { x: new Date('2025-04-22'), y: 10104.64 },
    { x: new Date('2025-04-23'), y: 10075.79 },
    { x: new Date('2025-04-24'), y: 10070.60 },
    { x: new Date('2025-04-26'), y: 10047.82 },
    { x: new Date('2025-04-27'), y: 10047.33 },
    { x: new Date('2025-04-28'), y: 10022.63 },
    { x: new Date('2025-05-02'), y: 9829.25 },
    { x: new Date('2025-05-05'), y: 9808.21 },
    { x: new Date('2025-05-06'), y: 9808.21 },
    { x: new Date('2025-05-08'), y: 9865.24 },
    { x: new Date('2025-05-09'), y: 9773.44 },
    { x: new Date('2025-05-10'), y: 9780.90 },
    { x: new Date('2025-05-11'), y: 9773.63 },
    { x: new Date('2025-05-12'), y: 9796.21 },
    { x: new Date('2025-05-13'), y: 9732.85 },
    { x: new Date('2025-05-14'), y: 9811.19 },
    { x: new Date('2025-05-15'), y: 9799.82 },
    { x: new Date('2025-05-16'), y: 9699.03 },
    { x: new Date('2025-05-17'), y: 9690.44 },
    { x: new Date('2025-05-19'), y: 9703.15 },
    { x: new Date('2025-05-20'), y: 9743.29 },
    { x: new Date('2025-05-21'), y: 9719.22 },
    { x: new Date('2025-05-22'), y: 9733.98 },
    { x: new Date('2025-05-24'), y: 9697.17 },
    { x: new Date('2025-05-26'), y: 9723.66 },
    { x: new Date('2025-05-27'), y: 9754.80 },
    { x: new Date('2025-06-04'), y: 9797.29 },
    { x: new Date('2025-06-05'), y: 9820.97 },
    { x: new Date('2025-06-06'), y: 9830.20 },
    { x: new Date('2025-06-07'), y: 9813.27 },
    { x: new Date('2025-06-08'), y: 9813.53 },
    { x: new Date('2025-06-10'), y: 9853.50 },
    { x: new Date('2025-06-11'), y: 9848.82 },
    { x: new Date('2025-06-12'), y: 9818.92 },
    { x: new Date('2025-06-13'), y: 9833.98 },
    { x: new Date('2025-06-14'), y: 9822.97 },
    { x: new Date('2025-06-15'), y: 9818.99 },
    { x: new Date('2025-06-16'), y: 9800.73 },
    { x: new Date('2025-06-17'), y: 9870.98 },
    { x: new Date('2025-06-18'), y: 9828.59 },
    { x: new Date('2025-06-20'), y: 9814.57 },
    { x: new Date('2025-06-21'), y: 9797.54 },
    { x: new Date('2025-06-22'), y: 9799.84 },
    { x: new Date('2025-06-23'), y: 9779.32 },
    { x: new Date('2025-06-24'), y: 9806.28 },
    { x: new Date('2025-06-25'), y: 9821.39 },
    { x: new Date('2025-06-26'), y: 9847.94 },
    { x: new Date('2025-06-27'), y: 9827.49 },
    { x: new Date('2025-06-28'), y: 9835.91 },
    { x: new Date('2025-06-29'), y: 9835.35 },
    { x: new Date('2025-06-30'), y: 9837.63 },
    { x: new Date('2025-07-01'), y: 9861.47 },
    { x: new Date('2025-07-02'), y: 9890.40 },
    { x: new Date('2025-07-04'), y: 9837.90 },
    { x: new Date('2025-07-05'), y: 9814.31 },
    { x: new Date('2025-07-06'), y: 9814.49 },
    { x: new Date('2025-07-07'), y: 9804.85 },
    { x: new Date('2025-07-08'), y: 9757.26 },
    { x: new Date('2025-07-09'), y: 9758.11 },
    { x: new Date('2025-07-10'), y: 9753.02 },
    { x: new Date('2025-07-12'), y: 9756.47 },
    { x: new Date('2025-07-13'), y: 9753.84 },
    { x: new Date('2025-07-14'), y: 9747.44 },
    { x: new Date('2025-07-16'), y: 9705.56 },
    { x: new Date('2025-07-17'), y: 9691.28 },
    { x: new Date('2025-07-19'), y: 9739.66 },
    { x: new Date('2025-07-20'), y: 9742.64 },
    { x: new Date('2025-07-21'), y: 9711.94 },
    { x: new Date('2025-07-22'), y: 9740.31 },
    { x: new Date('2025-07-23'), y: 9751.81 },
    { x: new Date('2025-07-24'), y: 9834.02 },
    { x: new Date('2025-07-25'), y: 9836.65 },
    { x: new Date('2025-07-26'), y: 9825.56 },
    { x: new Date('2025-07-27'), y: 9823.45 },
    { x: new Date('2025-07-29'), y: 9779.88 },
    { x: new Date('2025-07-30'), y: 9758.99 },
    { x: new Date('2025-07-31'), y: 9724.46 },
    { x: new Date('2025-08-01'), y: 9719.20 },
    { x: new Date('2025-08-02'), y: 9702.38 },
    { x: new Date('2025-08-03'), y: 9699.90 },
    { x: new Date('2025-08-04'), y: 9709.25 },
    { x: new Date('2025-08-05'), y: 9690.08 },
    { x: new Date('2025-08-06'), y: 9674.49 },
    { x: new Date('2025-08-07'), y: 9702.79 },
    { x: new Date('2025-08-08'), y: 9722.53 },
    { x: new Date('2025-08-09'), y: 9705.47 },
    { x: new Date('2025-08-10'), y: 9702.32 },
    { x: new Date('2025-08-11'), y: 9686.67 },
    { x: new Date('2025-08-12'), y: 9665.20 },
    { x: new Date('2025-08-13'), y: 9668.48 },
    { x: new Date('2025-08-14'), y: 9661.50 },
    { x: new Date('2025-08-15'), y: 9571.99 },
    { x: new Date('2025-08-16'), y: 9603.19 },
    { x: new Date('2025-08-18'), y: 9592.75 },
    { x: new Date('2025-08-19'), y: 9602.91 },
    { x: new Date('2025-08-20'), y: 9608.24 },
    { x: new Date('2025-08-21'), y: 9487.50 },
    { x: new Date('2025-08-22'), y: 9504.68 },
    { x: new Date('2025-08-23'), y: 9537.71 },
    { x: new Date('2025-08-24'), y: 9532.39 },
    { x: new Date('2025-08-25'), y: 9542.93 },
    { x: new Date('2025-08-26'), y: 9528.09 },
    { x: new Date('2025-08-27'), y: 9549.05 },
    { x: new Date('2025-08-28'), y: 9588.28 },
    { x: new Date('2025-08-29'), y: 9614.94 },
    { x: new Date('2025-08-30'), y: 9717.19 },
    { x: new Date('2025-08-31'), y: 9714.02 }];

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);