const fullData = [
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    { x: new Date('2025-07-16'), y: 285.49 },
    { x: new Date('2025-07-17'), y: 285.44 },
    { x: new Date('2025-07-18'), y: 285.74 },
    { x: new Date('2025-07-21'), y: 285.89 },
    { x: new Date('2025-07-22'), y: 286.37 },
    { x: new Date('2025-07-23'), y: 286.84 },
    { x: new Date('2025-07-24'), y: 286.86 },
    { x: new Date('2025-07-25'), y: 285.44 },
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    { x: new Date('2025-07-29'), y: 286.04 },
    { x: new Date('2025-07-30'), y: 283.34 },
    { x: new Date('2025-07-31'), y: 282.58 },
    { x: new Date('2025-08-01'), y: 285.69 },
    { x: new Date('2025-08-04'), y: 285.84 },
    { x: new Date('2025-08-05'), y: 284.77 },
    { x: new Date('2025-08-06'), y: 285.34 },
    { x: new Date('2025-08-07'), y: 285.28 },
    { x: new Date('2025-08-08'), y: 286.45 },
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    { x: new Date('2025-08-12'), y: 286.22 },
    { x: new Date('2025-08-13'), y: 285.95 },
    { x: new Date('2025-08-14'), y: 282.25 },
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    { x: new Date('2025-08-18'), y: 283.4 },
    { x: new Date('2025-08-19'), y: 283.72 },
    { x: new Date('2025-08-20'), y: 284.87 },
    { x: new Date('2025-08-21'), y: 284.78 },
    { x: new Date('2025-08-22'), y: 289.43 },
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    { x: new Date('2025-12-02'), y: 283.4 },
    { x: new Date('2025-12-03'), y: 281.7 },
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    { x: new Date('2025-12-25'), y: 284.97 },
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    { x: new Date('2025-12-29'), y: 285.33 },
    { x: new Date('2025-12-30'), y: 284.74 },
    { x: new Date('2025-12-31'), y: 283.32 },
    { x: new Date('2026-01-01'), y: 283.34 },
    { x: new Date('2026-01-02'), y: 284.17 },
    { x: new Date('2026-01-05'), y: 283.45 },
    { x: new Date('2026-01-06'), y: 282.82 },
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    { x: new Date('2026-03-10'), y: 285.9 },
    { x: new Date('2026-03-11'), y: 284.92 },
    { x: new Date('2026-03-12'), y: 284.15 },
    { x: new Date('2026-03-13'), y: 283.42 },
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    { x: new Date('2026-03-18'), y: 284.31 },
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    { x: new Date('2026-03-30'), y: 279.72 },
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    { x: new Date('2026-06-01'), y: 289.32 },
    { x: new Date('2026-06-02'), y: 289.17 },
    { x: new Date('2026-06-03'), y: 290.49 },
    { x: new Date('2026-06-04'), y: 293.1 },
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    { x: new Date('2026-06-19'), y: 292.77 },
    { x: new Date('2026-06-22'), y: 292.06 },
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    { x: new Date('2026-06-24'), y: 294.21 },
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    { x: new Date('2026-07-06'), y: 292.61 },
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    { x: new Date('2026-07-31'), y: 293.86 },
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    { x: new Date('2026-08-04'), y: 295.52 },
    { x: new Date('2026-08-05'), y: 295.28 },
    { x: new Date('2026-08-06'), y: 294.7 },
    { x: new Date('2026-08-07'), y: 293.96 },
    { x: new Date('2026-08-10'), y: 292.31 },
    { x: new Date('2026-08-11'), y: 291.14 },
    { x: new Date('2026-08-12'), y: 291.77 },
    { x: new Date('2026-08-13'), y: 291.21 },
    { x: new Date('2026-08-14'), y: 290 },
    { x: new Date('2026-08-17'), y: 289.87 },
    { x: new Date('2026-08-18'), y: 288.96 },
    { x: new Date('2026-08-19'), y: 288.47 },
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    { x: new Date('2026-08-25'), y: 287.34 },
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    { x: new Date('2026-08-27'), y: 286.28 },
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    { x: new Date('2026-08-31'), y: 283.98 },
    { x: new Date('2026-09-01'), y: 283.69 },
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    { x: new Date('2026-09-11'), y: 280.8 },
    { x: new Date('2026-09-14'), y: 280.62 },
    { x: new Date('2026-09-15'), y: 281.54 },
    { x: new Date('2026-09-16'), y: 281.59 },
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    { x: new Date('2026-09-18'), y: 282.09 },
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    { x: new Date('2026-09-25'), y: 286.36 },
    { x: new Date('2026-09-28'), y: 287.51 },
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    { x: new Date('2026-09-30'), y: 285.21 },
    { x: new Date('2026-10-01'), y: 285.83 },
    { x: new Date('2026-10-02'), y: 285.82 },
    { x: new Date('2026-10-05'), y: 285.84 },
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    { x: new Date('2026-10-07'), y: 285.08 },
    { x: new Date('2026-10-08'), y: 284.38 },
    { x: new Date('2026-10-09'), y: 284.91 },
    { x: new Date('2026-10-12'), y: 285.18 },
    { x: new Date('2026-10-13'), y: 284.95 },
    { x: new Date('2026-10-14'), y: 284.7 },
    { x: new Date('2026-10-15'), y: 284.21 },
    { x: new Date('2026-10-16'), y: 285.85 },
    { x: new Date('2026-10-19'), y: 286.31 },
    { x: new Date('2026-10-20'), y: 285.07 },
    { x: new Date('2026-10-21'), y: 284.13 },
    { x: new Date('2026-10-22'), y: 284.7 },
    { x: new Date('2026-10-23'), y: 284.678304 },
    { x: new Date('2026-10-24'), y: 284.219937 },
    { x: new Date('2026-10-25'), y: 284.219937 },
    { x: new Date('2026-10-26'), y: 284.11869 },
    { x: new Date('2026-10-27'), y: 284.146249 },
    { x: new Date('2026-10-28'), y: 283.660708 },
    { x: new Date('2026-10-29'), y: 284.00995 },
    { x: new Date('2026-10-30'), y: 284.322701 },
    { x: new Date('2026-10-31'), y: 284.604623 },
    { x: new Date('2026-11-01'), y: 284.623217 },
    { x: new Date('2026-11-02'), y: 284.730353 },
    { x: new Date('2026-11-03'), y: 286.074424 },
    { x: new Date('2026-11-04'), y: 285.586757 },
    { x: new Date('2026-11-05'), y: 285.683315 },
    { x: new Date('2026-11-06'), y: 286.883986 },
    { x: new Date('2026-11-07'), y: 286.902871 },
    { x: new Date('2026-11-08'), y: 286.974036 }];

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);