const fullData = [
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    { x: new Date('2025-07-16'), y: 11.73 },
    { x: new Date('2025-07-17'), y: 11.73 },
    { x: new Date('2025-07-18'), y: 11.71 },
    { x: new Date('2025-07-21'), y: 11.79 },
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    { x: new Date('2025-07-23'), y: 11.85 },
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    { x: new Date('2025-07-31'), y: 11.82 },
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    { x: new Date('2025-08-05'), y: 11.81 },
    { x: new Date('2025-08-06'), y: 11.82 },
    { x: new Date('2025-08-07'), y: 11.77 },
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    { x: new Date('2025-12-03'), y: 11.34 },
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    { x: new Date('2025-12-31'), y: 11.58 },
    { x: new Date('2026-01-01'), y: 11.56 },
    { x: new Date('2026-01-02'), y: 11.59 },
    { x: new Date('2026-01-05'), y: 11.59 },
    { x: new Date('2026-01-06'), y: 11.58 },
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    { x: new Date('2026-03-13'), y: 11.28 },
    { x: new Date('2026-03-16'), y: 11.41 },
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    { x: new Date('2026-04-02'), y: 11.25 },
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    { x: new Date('2026-05-18'), y: 11.85 },
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    { x: new Date('2026-05-20'), y: 11.75 },
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    { x: new Date('2026-06-03'), y: 11.69 },
    { x: new Date('2026-06-04'), y: 11.76 },
    { x: new Date('2026-06-05'), y: 11.55 },
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    { x: new Date('2026-06-17'), y: 11.61 },
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    { x: new Date('2026-07-07'), y: 11.87 },
    { x: new Date('2026-07-08'), y: 11.95 },
    { x: new Date('2026-07-09'), y: 12.01 },
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    { x: new Date('2026-08-07'), y: 12.71 },
    { x: new Date('2026-08-10'), y: 12.52 },
    { x: new Date('2026-08-11'), y: 12.63 },
    { x: new Date('2026-08-12'), y: 12.6 },
    { x: new Date('2026-08-13'), y: 12.59 },
    { x: new Date('2026-08-14'), y: 12.58 },
    { x: new Date('2026-08-17'), y: 12.59 },
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    { x: new Date('2026-08-31'), y: 12.96 },
    { x: new Date('2026-09-01'), y: 12.9 },
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    { x: new Date('2026-09-10'), y: 12.99 },
    { x: new Date('2026-09-11'), y: 13.11 },
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    { x: new Date('2026-09-15'), y: 12.98 },
    { x: new Date('2026-09-16'), y: 12.84 },
    { x: new Date('2026-09-17'), y: 12.85 },
    { x: new Date('2026-09-18'), y: 12.79 },
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    { x: new Date('2026-09-23'), y: 13.03 },
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    { x: new Date('2026-09-25'), y: 13.21 },
    { x: new Date('2026-09-28'), y: 13.22 },
    { x: new Date('2026-09-29'), y: 13.29 },
    { x: new Date('2026-09-30'), y: 13.17 },
    { x: new Date('2026-10-01'), y: 13.2 },
    { x: new Date('2026-10-02'), y: 13.31 },
    { x: new Date('2026-10-05'), y: 13.34 },
    { x: new Date('2026-10-06'), y: 13.37 },
    { x: new Date('2026-10-07'), y: 13.35 },
    { x: new Date('2026-10-08'), y: 13.33 },
    { x: new Date('2026-10-09'), y: 13.34 },
    { x: new Date('2026-10-12'), y: 13.41 },
    { x: new Date('2026-10-13'), y: 13.34 },
    { x: new Date('2026-10-14'), y: 13.36 },
    { x: new Date('2026-10-15'), y: 13.36 },
    { x: new Date('2026-10-16'), y: 13.49 },
    { x: new Date('2026-10-19'), y: 13.54 },
    { x: new Date('2026-10-20'), y: 13.56 },
    { x: new Date('2026-10-21'), y: 13.58 },
    { x: new Date('2026-10-22'), y: 13.64 },
    { x: new Date('2026-10-23'), y: 13.648075 },
    { x: new Date('2026-10-24'), y: 13.65588 },
    { x: new Date('2026-10-25'), y: 13.65588 },
    { x: new Date('2026-10-26'), y: 13.664477 },
    { x: new Date('2026-10-27'), y: 13.715438 },
    { x: new Date('2026-10-28'), y: 13.684942 },
    { x: new Date('2026-10-29'), y: 13.561738 },
    { x: new Date('2026-10-30'), y: 13.561159 },
    { x: new Date('2026-10-31'), y: 13.587567 },
    { x: new Date('2026-11-01'), y: 13.584066 },
    { x: new Date('2026-11-02'), y: 13.598665 },
    { x: new Date('2026-11-03'), y: 13.499565 },
    { x: new Date('2026-11-04'), y: 13.49464 },
    { x: new Date('2026-11-05'), y: 13.531436 },
    { x: new Date('2026-11-06'), y: 13.415267 },
    { x: new Date('2026-11-07'), y: 13.340685 },
    { x: new Date('2026-11-08'), y: 13.352621 }];

const options = {
    chart: {
        type: 'area',
        height: 300,
        toolbar: { show: false },
        zoom: { enabled: false }
    },
    series: [{ name: '', data: fullData }],
    xaxis: {
        type: 'datetime'
    },
    yaxis: {
        tickAmount: 10,
        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 startTime = start.getTime();

    const filtered = fullData.filter(item =>
        item.x >= startTime && item.x <= latestDate
    );

    chart.updateSeries([{ name: '', data: filtered }], true);

    chart.updateOptions({
        xaxis: {
            type: 'datetime',
            min: startTime,
            max: latestDate
        }
    });
}

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);