const fullData = [
    { x: new Date('2025-04-09'), y: 2478.65 },
    { x: new Date('2025-04-10'), y: 2483.63 },
    { x: new Date('2025-04-11'), y: 2515.84 },
    { x: new Date('2025-04-12'), y: 2549.20 },
    { x: new Date('2025-04-13'), y: 2549.65 },
    { x: new Date('2025-04-14'), y: 2555.78 },
    { x: new Date('2025-04-15'), y: 2551.44 },
    { x: new Date('2025-04-16'), y: 2546.02 },
    { x: new Date('2025-04-17'), y: 2563.23 },
    { x: new Date('2025-04-18'), y: 2566.02 },
    { x: new Date('2025-04-19'), y: 2568.83 },
    { x: new Date('2025-04-20'), y: 2568.43 },
    { x: new Date('2025-04-21'), y: 2577.91 },
    { x: new Date('2025-04-22'), y: 2595.45 },
    { x: new Date('2025-04-23'), y: 2575.74 },
    { x: new Date('2025-04-24'), y: 2567.50 },
    { x: new Date('2025-04-26'), y: 2566.10 },
    { x: new Date('2025-04-27'), y: 2566.43 },
    { x: new Date('2025-04-28'), y: 2561.79 },
    { x: new Date('2025-05-02'), y: 2517.41 },
    { x: new Date('2025-05-05'), y: 2497.55 },
    { x: new Date('2025-05-06'), y: 2497.55 },
    { x: new Date('2025-05-08'), y: 2498.30 },
    { x: new Date('2025-05-09'), y: 2489.05 },
    { x: new Date('2025-05-10'), y: 2496.21 },
    { x: new Date('2025-05-11'), y: 2495.32 },
    { x: new Date('2025-05-12'), y: 2488.57 },
    { x: new Date('2025-05-13'), y: 2455.26 },
    { x: new Date('2025-05-14'), y: 2471.45 },
    { x: new Date('2025-05-15'), y: 2485.96 },
    { x: new Date('2025-05-16'), y: 2475.33 },
    { x: new Date('2025-05-17'), y: 2460.60 },
    { x: new Date('2025-05-19'), y: 2466.77 },
    { x: new Date('2025-05-20'), y: 2476.79 },
    { x: new Date('2025-05-21'), y: 2479.79 },
    { x: new Date('2025-05-22'), y: 2489.74 },
    { x: new Date('2025-05-24'), y: 2465.63 },
    { x: new Date('2025-05-26'), y: 2465.23 },
    { x: new Date('2025-05-27'), y: 2475.09 },
    { x: new Date('2025-06-04'), y: 2486.85 },
    { x: new Date('2025-06-05'), y: 2492.38 },
    { x: new Date('2025-06-06'), y: 2495.72 },
    { x: new Date('2025-06-07'), y: 2492.39 },
    { x: new Date('2025-06-08'), y: 2490.75 },
    { x: new Date('2025-06-10'), y: 2491.76 },
    { x: new Date('2025-06-11'), y: 2492.93 },
    { x: new Date('2025-06-12'), y: 2503.96 },
    { x: new Date('2025-06-13'), y: 2520.43 },
    { x: new Date('2025-06-14'), y: 2524.49 },
    { x: new Date('2025-06-15'), y: 2523.23 },
    { x: new Date('2025-06-16'), y: 2519.85 },
    { x: new Date('2025-06-17'), y: 2524.89 },
    { x: new Date('2025-06-18'), y: 2507.54 },
    { x: new Date('2025-06-20'), y: 2524.07 },
    { x: new Date('2025-06-21'), y: 2529.25 },
    { x: new Date('2025-06-22'), y: 2529.23 },
    { x: new Date('2025-06-23'), y: 2524.56 },
    { x: new Date('2025-06-24'), y: 2557.44 },
    { x: new Date('2025-06-25'), y: 2542.98 },
    { x: new Date('2025-06-26'), y: 2546.34 },
    { x: new Date('2025-06-27'), y: 2543.28 },
    { x: new Date('2025-06-28'), y: 2544.63 },
    { x: new Date('2025-06-29'), y: 2544.24 },
    { x: new Date('2025-06-30'), y: 2547.78 },
    { x: new Date('2025-07-01'), y: 2559.56 },
    { x: new Date('2025-07-02'), y: 2562.33 },
    { x: new Date('2025-07-04'), y: 2553.10 },
    { x: new Date('2025-07-05'), y: 2555.28 },
    { x: new Date('2025-07-06'), y: 2555.25 },
    { x: new Date('2025-07-07'), y: 2554.77 },
    { x: new Date('2025-07-08'), y: 2553.14 },
    { x: new Date('2025-07-09'), y: 2550.77 },
    { x: new Date('2025-07-10'), y: 2552.37 },
    { x: new Date('2025-07-12'), y: 2538.81 },
    { x: new Date('2025-07-13'), y: 2538.59 },
    { x: new Date('2025-07-14'), y: 2542.62 },
    { x: new Date('2025-07-16'), y: 2534.67 },
    { x: new Date('2025-07-17'), y: 2537.93 },
    { x: new Date('2025-07-19'), y: 2542.50 },
    { x: new Date('2025-07-20'), y: 2542.55 },
    { x: new Date('2025-07-21'), y: 2539.96 },
    { x: new Date('2025-07-22'), y: 2554.09 },
    { x: new Date('2025-07-23'), y: 2561.56 },
    { x: new Date('2025-07-24'), y: 2564.22 },
    { x: new Date('2025-07-25'), y: 2565.14 },
    { x: new Date('2025-07-26'), y: 2565.72 },
    { x: new Date('2025-07-27'), y: 2566.79 },
    { x: new Date('2025-07-29'), y: 2542.80 },
    { x: new Date('2025-07-30'), y: 2537.62 },
    { x: new Date('2025-07-31'), y: 2518.88 },
    { x: new Date('2025-08-01'), y: 2522.76 },
    { x: new Date('2025-08-02'), y: 2544.66 },
    { x: new Date('2025-08-03'), y: 2538.43 },
    { x: new Date('2025-08-04'), y: 2551.42 },
    { x: new Date('2025-08-05'), y: 2541.87 },
    { x: new Date('2025-08-06'), y: 2540.30 },
    { x: new Date('2025-08-07'), y: 2552.70 },
    { x: new Date('2025-08-08'), y: 2548.91 },
    { x: new Date('2025-08-09'), y: 2546.37 },
    { x: new Date('2025-08-10'), y: 2545.11 },
    { x: new Date('2025-08-11'), y: 2541.96 },
    { x: new Date('2025-08-12'), y: 2532.34 },
    { x: new Date('2025-08-13'), y: 2542.74 },
    { x: new Date('2025-08-14'), y: 2539.77 },
    { x: new Date('2025-08-15'), y: 2518.26 },
    { x: new Date('2025-08-16'), y: 2524.15 },
    { x: new Date('2025-08-18'), y: 2535.10 },
    { x: new Date('2025-08-19'), y: 2528.68 },
    { x: new Date('2025-08-20'), y: 2538.91 },
    { x: new Date('2025-08-21'), y: 2541.98 },
    { x: new Date('2025-08-22'), y: 2538.81 },
    { x: new Date('2025-08-23'), y: 2558.33 },
    { x: new Date('2025-08-24'), y: 2553.76 },
    { x: new Date('2025-08-25'), y: 2550.11 },
    { x: new Date('2025-08-26'), y: 2537.57 },
    { x: new Date('2025-08-27'), y: 2542.93 },
    { x: new Date('2025-08-28'), y: 2553.32 },
    { x: new Date('2025-08-29'), y: 2557.42 },
    { x: new Date('2025-08-30'), y: 2584.62 },
    { x: new Date('2025-08-31'), y: 2582.69 }];

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);