const fullData = [
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    { x: new Date('2024-08-29'), y: 15399 },
    { x: new Date('2024-08-30'), y: 15488 },
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    { x: new Date('2025-05-16'), y: 16505.70 },
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    { x: new Date('2025-05-20'), y: 16451.85 },
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    { x: new Date('2025-05-22'), y: 16396.17 },
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    { x: new Date('2025-06-04'), y: 16327.81 },
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    { x: new Date('2025-06-06'), y: 16267.92 },
    { x: new Date('2025-06-07'), y: 16303.44 },
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    { x: new Date('2025-06-10'), y: 16284.64 },
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    { x: new Date('2025-06-12'), y: 16269.33 },
    { x: new Date('2025-06-13'), y: 16225.91 },
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    { x: new Date('2025-06-15'), y: 16317.90 },
    { x: new Date('2025-06-16'), y: 16303.51 },
    { x: new Date('2025-06-17'), y: 16295.26 },
    { x: new Date('2025-06-18'), y: 16290.56 },
    { x: new Date('2025-06-20'), y: 16383.51 },
    { x: new Date('2025-06-21'), y: 16393.15 },
    { x: new Date('2025-06-22'), y: 16401.81 },
    { x: new Date('2025-06-23'), y: 16411.70 },
    { x: new Date('2025-06-24'), y: 16497.82 },
    { x: new Date('2025-06-25'), y: 16326.42 },
    { x: new Date('2025-06-26'), y: 16311.88 },
    { x: new Date('2025-06-27'), y: 16217.50 },
    { x: new Date('2025-06-28'), y: 16239.22 },
    { x: new Date('2025-06-29'), y: 16236.09 },
    { x: new Date('2025-06-30'), y: 16230.20 },
    { x: new Date('2025-07-01'), y: 16214.17 },
    { x: new Date('2025-07-02'), y: 16213.29 },
    { x: new Date('2025-07-04'), y: 16204.39 },
    { x: new Date('2025-07-05'), y: 16198.49 },
    { x: new Date('2025-07-06'), y: 16196.74 },
    { x: new Date('2025-07-07'), y: 16197.31 },
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    { x: new Date('2025-07-10'), y: 16263.74 },
    { x: new Date('2025-07-12'), y: 16235.22 },
    { x: new Date('2025-07-13'), y: 16234.84 },
    { x: new Date('2025-07-14'), y: 16238.56 },
    { x: new Date('2025-07-16'), y: 16277.69 },
    { x: new Date('2025-07-17'), y: 16307.22 },
    { x: new Date('2025-07-19'), y: 16316.69 },
    { x: new Date('2025-07-20'), y: 16317.39 },
    { x: new Date('2025-07-21'), y: 16295.98 },
    { x: new Date('2025-07-22'), y: 16315.93 },
    { x: new Date('2025-07-23'), y: 16287.94 },
    { x: new Date('2025-07-24'), y: 16272.49 },
    { x: new Date('2025-07-25'), y: 16283.17 },
    { x: new Date('2025-07-26'), y: 16337.02 },
    { x: new Date('2025-07-27'), y: 16333.41 },
    { x: new Date('2025-07-29'), y: 16370.24 },
    { x: new Date('2025-07-30'), y: 16394.58 },
    { x: new Date('2025-07-31'), y: 16430.53 },
    { x: new Date('2025-08-01'), y: 16485.89 },
    { x: new Date('2025-08-02'), y: 16441.54 },
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    { x: new Date('2025-08-04'), y: 16438.85 },
    { x: new Date('2025-08-05'), y: 16384.80 },
    { x: new Date('2025-08-06'), y: 16392.85 },
    { x: new Date('2025-08-07'), y: 16359.01 },
    { x: new Date('2025-08-08'), y: 16321.75 },
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    { x: new Date('2025-08-10'), y: 16297.21 },
    { x: new Date('2025-08-11'), y: 16279.02 },
    { x: new Date('2025-08-12'), y: 16278.75 },
    { x: new Date('2025-08-13'), y: 16264.78 },
    { x: new Date('2025-08-14'), y: 16145.04 },
    { x: new Date('2025-08-15'), y: 16136.08 },
    { x: new Date('2025-08-16'), y: 16161.78 },
    { x: new Date('2025-08-18'), y: 16184.77 },
    { x: new Date('2025-08-19'), y: 16208.45 },
    { x: new Date('2025-08-20'), y: 16272.49 },
    { x: new Date('2025-08-21'), y: 16287.92 },
    { x: new Date('2025-08-22'), y: 16328.25 },
    { x: new Date('2025-08-23'), y: 16299.39 },
    { x: new Date('2025-08-24'), y: 16295.91 },
    { x: new Date('2025-08-25'), y: 16296.53 },
    { x: new Date('2025-08-26'), y: 16265.13 },
    { x: new Date('2025-08-27'), y: 16302.90 },
    { x: new Date('2025-08-28'), y: 16394.37 },
    { x: new Date('2025-08-29'), y: 16351.23 },
    { x: new Date('2025-08-30'), y: 16484.66 },
    { x: new Date('2025-08-31'), y: 16482.03 }];

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);