const fullData = [
    { x: new Date('2025-04-09'), y: 12494.78 },
    { x: new Date('2025-04-10'), y: 12547.48 },
    { x: new Date('2025-04-11'), y: 12626.41 },
    { x: new Date('2025-04-12'), y: 12720.17 },
    { x: new Date('2025-04-13'), y: 12729.20 },
    { x: new Date('2025-04-14'), y: 12738.42 },
    { x: new Date('2025-04-15'), y: 12741.15 },
    { x: new Date('2025-04-16'), y: 12762.94 },
    { x: new Date('2025-04-17'), y: 12792.31 },
    { x: new Date('2025-04-18'), y: 12852.21 },
    { x: new Date('2025-04-19'), y: 12841.23 },
    { x: new Date('2025-04-20'), y: 12842.38 },
    { x: new Date('2025-04-21'), y: 12849.69 },
    { x: new Date('2025-04-22'), y: 12901.22 },
    { x: new Date('2025-04-23'), y: 12862.92 },
    { x: new Date('2025-04-24'), y: 12852.18 },
    { x: new Date('2025-04-26'), y: 12825.08 },
    { x: new Date('2025-04-27'), y: 12823.99 },
    { x: new Date('2025-04-28'), y: 12807.17 },
    { x: new Date('2025-05-02'), y: 12692.22 },
    { x: new Date('2025-05-05'), y: 12674.55 },
    { x: new Date('2025-05-06'), y: 12674.55 },
    { x: new Date('2025-05-08'), y: 12746.60 },
    { x: new Date('2025-05-09'), y: 12719.59 },
    { x: new Date('2025-05-10'), y: 12750.43 },
    { x: new Date('2025-05-11'), y: 12744.82 },
    { x: new Date('2025-05-12'), y: 12739.56 },
    { x: new Date('2025-05-13'), y: 12656.12 },
    { x: new Date('2025-05-14'), y: 12662.61 },
    { x: new Date('2025-05-15'), y: 12752.90 },
    { x: new Date('2025-05-16'), y: 12712.54 },
    { x: new Date('2025-05-17'), y: 12657.89 },
    { x: new Date('2025-05-19'), y: 12665.21 },
    { x: new Date('2025-05-20'), y: 12694.43 },
    { x: new Date('2025-05-21'), y: 12669.03 },
    { x: new Date('2025-05-22'), y: 12724.32 },
    { x: new Date('2025-05-24'), y: 12614.34 },
    { x: new Date('2025-05-26'), y: 12623.71 },
    { x: new Date('2025-05-27'), y: 12621.25 },
    { x: new Date('2025-06-04'), y: 12650.43 },
    { x: new Date('2025-06-05'), y: 12659.39 },
    { x: new Date('2025-06-06'), y: 12654.37 },
    { x: new Date('2025-06-07'), y: 12645.41 },
    { x: new Date('2025-06-08'), y: 12649.20 },
    { x: new Date('2025-06-10'), y: 12662.71 },
    { x: new Date('2025-06-11'), y: 12650.13 },
    { x: new Date('2025-06-12'), y: 12656.18 },
    { x: new Date('2025-06-13'), y: 12684.64 },
    { x: new Date('2025-06-14'), y: 12736.23 },
    { x: new Date('2025-06-15'), y: 12727.67 },
    { x: new Date('2025-06-16'), y: 12705.60 },
    { x: new Date('2025-06-17'), y: 12730.41 },
    { x: new Date('2025-06-18'), y: 12646.23 },
    { x: new Date('2025-06-20'), y: 12716.51 },
    { x: new Date('2025-06-21'), y: 12734.90 },
    { x: new Date('2025-06-22'), y: 12738.14 },
    { x: new Date('2025-06-23'), y: 12721.18 },
    { x: new Date('2025-06-24'), y: 12824.11 },
    { x: new Date('2025-06-25'), y: 12760.94 },
    { x: new Date('2025-06-26'), y: 12753.73 },
    { x: new Date('2025-06-27'), y: 12727.51 },
    { x: new Date('2025-06-28'), y: 12720.46 },
    { x: new Date('2025-06-29'), y: 12714.60 },
    { x: new Date('2025-06-30'), y: 12707.37 },
    { x: new Date('2025-07-01'), y: 12751.37 },
    { x: new Date('2025-07-02'), y: 12739.33 },
    { x: new Date('2025-07-04'), y: 12703.09 },
    { x: new Date('2025-07-05'), y: 12706.97 },
    { x: new Date('2025-07-06'), y: 12707.20 },
    { x: new Date('2025-07-07'), y: 12703.32 },
    { x: new Date('2025-07-08'), y: 12701.69 },
    { x: new Date('2025-07-09'), y: 12698.07 },
    { x: new Date('2025-07-10'), y: 12699.83 },
    { x: new Date('2025-07-12'), y: 12682.49 },
    { x: new Date('2025-07-13'), y: 12675.23 },
    { x: new Date('2025-07-14'), y: 12675.33 },
    { x: new Date('2025-07-16'), y: 12684.09 },
    { x: new Date('2025-07-17'), y: 12687.58 },
    { x: new Date('2025-07-19'), y: 12698.21 },
    { x: new Date('2025-07-20'), y: 12696.32 },
    { x: new Date('2025-07-21'), y: 12690.38 },
    { x: new Date('2025-07-22'), y: 12731.41 },
    { x: new Date('2025-07-23'), y: 12725.78 },
    { x: new Date('2025-07-24'), y: 12732.67 },
    { x: new Date('2025-07-25'), y: 12740.71 },
    { x: new Date('2025-07-26'), y: 12740.09 },
    { x: new Date('2025-07-27'), y: 12742.18 },
    { x: new Date('2025-07-29'), y: 12720.43 },
    { x: new Date('2025-07-30'), y: 12728.90 },
    { x: new Date('2025-07-31'), y: 12695.75 },
    { x: new Date('2025-08-01'), y: 12698.09 },
    { x: new Date('2025-08-02'), y: 12739.00 },
    { x: new Date('2025-08-03'), y: 12732.87 },
    { x: new Date('2025-08-04'), y: 12761.03 },
    { x: new Date('2025-08-05'), y: 12726.96 },
    { x: new Date('2025-08-06'), y: 12722.70 },
    { x: new Date('2025-08-07'), y: 12725.21 },
    { x: new Date('2025-08-08'), y: 12711.62 },
    { x: new Date('2025-08-09'), y: 12696.46 },
    { x: new Date('2025-08-10'), y: 12688.15 },
    { x: new Date('2025-08-11'), y: 12673.40 },
    { x: new Date('2025-08-12'), y: 12643.11 },
    { x: new Date('2025-08-13'), y: 12666.28 },
    { x: new Date('2025-08-14'), y: 12635.99 },
    { x: new Date('2025-08-15'), y: 12558.46 },
    { x: new Date('2025-08-16'), y: 12576.44 },
    { x: new Date('2025-08-18'), y: 12598.91 },
    { x: new Date('2025-08-19'), y: 12623.29 },
    { x: new Date('2025-08-20'), y: 12660.35 },
    { x: new Date('2025-08-21'), y: 12671.77 },
    { x: new Date('2025-08-22'), y: 12662.80 },
    { x: new Date('2025-08-23'), y: 12714.28 },
    { x: new Date('2025-08-24'), y: 12709.84 },
    { x: new Date('2025-08-25'), y: 12731.59 },
    { x: new Date('2025-08-26'), y: 12659.14 },
    { x: new Date('2025-08-27'), y: 12676.33 },
    { x: new Date('2025-08-28'), y: 12744.08 },
    { x: new Date('2025-08-29'), y: 12740.74 },
    { x: new Date('2025-08-30'), y: 12855.53 },
    { x: new Date('2025-08-31'), y: 12845.66 }];

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);