const fullData = [
    { x: new Date('2025-04-09'), y: 19872.05 },
    { x: new Date('2025-04-10'), y: 19917.25 },
    { x: new Date('2025-04-11'), y: 19992.10 },
    { x: new Date('2025-04-12'), y: 20481.74 },
    { x: new Date('2025-04-13'), y: 20465.41 },
    { x: new Date('2025-04-14'), y: 20543.64 },
    { x: new Date('2025-04-15'), y: 20507.18 },
    { x: new Date('2025-04-16'), y: 20541.97 },
    { x: new Date('2025-04-17'), y: 20610.56 },
    { x: new Date('2025-04-18'), y: 20590.97 },
    { x: new Date('2025-04-19'), y: 20582.41 },
    { x: new Date('2025-04-20'), y: 20582.14 },
    { x: new Date('2025-04-21'), y: 20688.47 },
    { x: new Date('2025-04-22'), y: 20829.03 },
    { x: new Date('2025-04-23'), y: 20618.28 },
    { x: new Date('2025-04-24'), y: 20436.23 },
    { x: new Date('2025-04-26'), y: 20329.62 },
    { x: new Date('2025-04-27'), y: 20329.37 },
    { x: new Date('2025-04-28'), y: 20325.12 },
    { x: new Date('2025-05-02'), y: 20056.10 },
    { x: new Date('2025-05-05'), y: 19929.29 },
    { x: new Date('2025-05-06'), y: 19929.29 },
    { x: new Date('2025-05-08'), y: 19923.33 },
    { x: new Date('2025-05-09'), y: 19931.03 },
    { x: new Date('2025-05-10'), y: 19914.73 },
    { x: new Date('2025-05-11'), y: 19907.88 },
    { x: new Date('2025-05-12'), y: 19841.19 },
    { x: new Date('2025-05-13'), y: 19546.05 },
    { x: new Date('2025-05-14'), y: 19654.03 },
    { x: new Date('2025-05-15'), y: 19745.59 },
    { x: new Date('2025-05-16'), y: 19720.47 },
    { x: new Date('2025-05-17'), y: 19617.61 },
    { x: new Date('2025-05-19'), y: 19677.49 },
    { x: new Date('2025-05-20'), y: 19700.51 },
    { x: new Date('2025-05-21'), y: 19756.44 },
    { x: new Date('2025-05-22'), y: 19808.16 },
    { x: new Date('2025-05-24'), y: 19712.70 },
    { x: new Date('2025-05-26'), y: 19699.99 },
    { x: new Date('2025-05-27'), y: 19741.95 },
    { x: new Date('2025-06-04'), y: 19832.15 },
    { x: new Date('2025-06-05'), y: 19868.03 },
    { x: new Date('2025-06-06'), y: 19837.42 },
    { x: new Date('2025-06-07'), y: 19808.80 },
    { x: new Date('2025-06-08'), y: 19810.26 },
    { x: new Date('2025-06-10'), y: 19826.08 },
    { x: new Date('2025-06-11'), y: 19799.17 },
    { x: new Date('2025-06-12'), y: 19827.55 },
    { x: new Date('2025-06-13'), y: 19979.96 },
    { x: new Date('2025-06-14'), y: 20113.34 },
    { x: new Date('2025-06-15'), y: 20097.50 },
    { x: new Date('2025-06-16'), y: 20075.54 },
    { x: new Date('2025-06-17'), y: 20053.10 },
    { x: new Date('2025-06-18'), y: 19931.97 },
    { x: new Date('2025-06-20'), y: 20024.65 },
    { x: new Date('2025-06-21'), y: 20041.16 },
    { x: new Date('2025-06-22'), y: 20043.20 },
    { x: new Date('2025-06-23'), y: 20052.66 },
    { x: new Date('2025-06-24'), y: 20262.92 },
    { x: new Date('2025-06-25'), y: 20246.98 },
    { x: new Date('2025-06-26'), y: 20255.46 },
    { x: new Date('2025-06-27'), y: 20265.35 },
    { x: new Date('2025-06-28'), y: 20279.73 },
    { x: new Date('2025-06-29'), y: 20279.15 },
    { x: new Date('2025-06-30'), y: 20290.03 },
    { x: new Date('2025-07-01'), y: 20407.89 },
    { x: new Date('2025-07-02'), y: 20492.35 },
    { x: new Date('2025-07-04'), y: 20367.96 },
    { x: new Date('2025-07-05'), y: 20390.64 },
    { x: new Date('2025-07-06'), y: 20391.28 },
    { x: new Date('2025-07-07'), y: 20378.22 },
    { x: new Date('2025-07-08'), y: 20367.26 },
    { x: new Date('2025-07-09'), y: 20385.98 },
    { x: new Date('2025-07-10'), y: 20449.44 },
    { x: new Date('2025-07-12'), y: 20381.23 },
    { x: new Date('2025-07-13'), y: 20368.96 },
    { x: new Date('2025-07-14'), y: 20369.12 },
    { x: new Date('2025-07-16'), y: 20361.27 },
    { x: new Date('2025-07-17'), y: 20319.36 },
    { x: new Date('2025-07-19'), y: 20353.52 },
    { x: new Date('2025-07-20'), y: 20345.88 },
    { x: new Date('2025-07-21'), y: 20336.95 },
    { x: new Date('2025-07-22'), y: 20420.75 },
    { x: new Date('2025-07-23'), y: 20484.37 },
    { x: new Date('2025-07-24'), y: 20509.70 },
    { x: new Date('2025-07-25'), y: 20476.49 },
    { x: new Date('2025-07-26'), y: 20502.34 },
    { x: new Date('2025-07-27'), y: 20502.30 },
    { x: new Date('2025-07-29'), y: 20383.32 },
    { x: new Date('2025-07-30'), y: 20344.15 },
    { x: new Date('2025-07-31'), y: 20262.97 },
    { x: new Date('2025-08-01'), y: 20269.19 },
    { x: new Date('2025-08-02'), y: 20349.40 },
    { x: new Date('2025-08-03'), y: 20319.45 },
    { x: new Date('2025-08-04'), y: 20406.54 },
    { x: new Date('2025-08-05'), y: 20281.13 },
    { x: new Date('2025-08-06'), y: 20274.10 },
    { x: new Date('2025-08-07'), y: 20275.36 },
    { x: new Date('2025-08-08'), y: 20221.99 },
    { x: new Date('2025-08-09'), y: 20193.90 },
    { x: new Date('2025-08-10'), y: 20178.04 },
    { x: new Date('2025-08-11'), y: 20158.56 },
    { x: new Date('2025-08-12'), y: 20018.42 },
    { x: new Date('2025-08-13'), y: 20112.55 },
    { x: new Date('2025-08-14'), y: 20117.21 },
    { x: new Date('2025-08-15'), y: 19967.45 },
    { x: new Date('2025-08-16'), y: 20007.05 },
    { x: new Date('2025-08-18'), y: 20032.54 },
    { x: new Date('2025-08-19'), y: 20028.67 },
    { x: new Date('2025-08-20'), y: 20159.56 },
    { x: new Date('2025-08-21'), y: 20219.24 },
    { x: new Date('2025-08-22'), y: 20204.80 },
    { x: new Date('2025-08-23'), y: 20301.79 },
    { x: new Date('2025-08-24'), y: 20284.26 },
    { x: new Date('2025-08-25'), y: 20327.63 },
    { x: new Date('2025-08-26'), y: 20223.62 },
    { x: new Date('2025-08-27'), y: 20264.43 },
    { x: new Date('2025-08-28'), y: 20402.23 },
    { x: new Date('2025-08-29'), y: 20398.89 },
    { x: new Date('2025-08-30'), y: 20611.03 },
    { x: new Date('2025-08-31'), y: 20592.55 }];

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);