const fullData = [
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    { x: new Date('2025-07-16'), y: 207.63 },
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    { x: new Date('2025-07-21'), y: 208.57 },
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    { x: new Date('2025-08-07'), y: 205.55 },
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    { x: new Date('2026-01-01'), y: 211.75 },
    { x: new Date('2026-01-02'), y: 208.22 },
    { x: new Date('2026-01-05'), y: 207.02 },
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    { x: new Date('2026-08-10'), y: 215.19 },
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    { x: new Date('2026-10-14'), y: 214.05 },
    { x: new Date('2026-10-15'), y: 213.68 },
    { x: new Date('2026-10-16'), y: 216.73 },
    { x: new Date('2026-10-19'), y: 217.95 },
    { x: new Date('2026-10-20'), y: 218.11 },
    { x: new Date('2026-10-21'), y: 219.78 },
    { x: new Date('2026-10-22'), y: 221.08 },
    { x: new Date('2026-10-23'), y: 221.859381 },
    { x: new Date('2026-10-24'), y: 222.517934 },
    { x: new Date('2026-10-25'), y: 222.517934 },
    { x: new Date('2026-10-26'), y: 224.209574 },
    { x: new Date('2026-10-27'), y: 224.951825 },
    { x: new Date('2026-10-28'), y: 225.356685 },
    { x: new Date('2026-10-29'), y: 225.681129 },
    { x: new Date('2026-10-30'), y: 225.183523 },
    { x: new Date('2026-10-31'), y: 225.506148 },
    { x: new Date('2026-11-01'), y: 225.529627 },
    { x: new Date('2026-11-02'), y: 225.000605 },
    { x: new Date('2026-11-03'), y: 224.325298 },
    { x: new Date('2026-11-04'), y: 222.799819 },
    { x: new Date('2026-11-05'), y: 221.836002 },
    { x: new Date('2026-11-06'), y: 221.547415 },
    { x: new Date('2026-11-07'), y: 221.549547 },
    { x: new Date('2026-11-08'), y: 221.395969 }];

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);