const allData = {
    jual: [
        { x: new Date('2025-06-21'), y: 1946855 },
    { x: new Date('2025-06-22'), y: 1946855 },
    { x: new Date('2025-06-23'), y: 1946855 },
    { x: new Date('2025-06-24'), y: 1936830 },
    { x: new Date('2025-06-25'), y: 1936830 },
    { x: new Date('2025-06-26'), y: 1928810 },
    { x: new Date('2025-06-27'), y: 1911768 },
    { x: new Date('2025-06-28'), y: 1888710 },
    { x: new Date('2025-06-29'), y: 1888710 },
    { x: new Date('2025-06-30'), y: 1884700 },
    { x: new Date('2025-07-01'), y: 1884700 }    ],
    beli: [
        { x: new Date('2025-06-21'), y: 1786000 },
    { x: new Date('2025-06-22'), y: 1786000 },
    { x: new Date('2025-06-23'), y: 1786000 },
    { x: new Date('2025-06-24'), y: 1776000 },
    { x: new Date('2025-06-25'), y: 1776000 },
    { x: new Date('2025-06-26'), y: 1768000 },
    { x: new Date('2025-06-27'), y: 1751000 },
    { x: new Date('2025-06-28'), y: 1728000 },
    { x: new Date('2025-06-29'), y: 1728000 },
    { x: new Date('2025-06-30'), y: 1724000 },
    { x: new Date('2025-07-01'), y: 1740000 }    ]
};

  const chartOptions = {
    chart: {
      type: 'area',
      height: '300',
      zoom: { enabled: false },
      toolbar: { show: false },
      offsetX: 0
    },
    colors: ['#008FFB', '#DFBD69'],
    dataLabels: { enabled: false },
    stroke: { curve: 'smooth', width: 2 },
    series: [],
    xaxis: {
      type: 'datetime',
      labels: { datetimeUTC: false },
      min: undefined,
      max: undefined
    },
    yaxis: {
      tickAmount: 4,
      labels: {
        style: { fontSize: '12px' },
        offsetX: -15,
        formatter: function (value) {
          const text = value.toLocaleString('id-ID');
          return text.length > 5 ? text.slice(0, 5) + '…' : text;
        }
      }
    },
    grid: {
      padding: {
        left: -10,
        right: 0
      }
    },
    tooltip: {
      x: { format: 'dd MMM yyyy' },
      y: {
        formatter: value => new Intl.NumberFormat('id-ID', {
          style: 'currency',
          currency: 'IDR',
          maximumFractionDigits: 0
        }).format(value)
      }
    },
    fill: {
      type: 'gradient',
      gradient: {
        shadeIntensity: 1,
        opacityFrom: 0.4,
        opacityTo: 0.05,
        stops: [0, 90, 100]
      }
    },
    legend: {
      position: 'top',
      horizontalAlign: 'right'
    }
  };

  const chart = new ApexCharts(document.querySelector("#chart"), chartOptions);
  chart.render();

  function padIfTooFew(data, cutoff, now) {
    if (data.length === 1) {
      return [
        { x: cutoff.getTime(), y: null },
        ...data,
        { x: now.getTime(), y: null }
      ];
    }
    return data;
  }

  function filterData(months) {
    const now = new Date();
    let cutoff;

    if (months === 'all') {
      cutoff = new Date('2000-01-01');
    } else {
      cutoff = new Date();
      cutoff.setMonth(cutoff.getMonth() - parseInt(months));
    }

    let filteredJual = allData.jual.filter(d => d.x >= cutoff.getTime());
    let filteredBeli = allData.beli.filter(d => d.x >= cutoff.getTime());

    filteredJual = padIfTooFew(filteredJual, cutoff, now);
    filteredBeli = padIfTooFew(filteredBeli, cutoff, now);

    chart.updateSeries([
      { name: 'Jual', data: filteredJual },
      { name: 'Beli', data: filteredBeli }
    ]);

    chart.updateOptions({
      xaxis: {
        min: cutoff.getTime(),
        max: now.getTime()
      }
    });
  }

  document.querySelectorAll(".filter-btn").forEach(btn => {
    btn.addEventListener("click", function () {
      document.querySelectorAll(".filter-btn").forEach(b => b.classList.remove("active"));
      this.classList.add("active");
      const months = this.getAttribute("data-months");
      if (months) {
        filterData(months);
      }
    });
  });

  // Initial load (1 Bulan)
  filterData('1');