const allData = {
    jual: [],
    beli: [
        { x: new Date('2025-07-17'), y: 1700000 },
    { x: new Date('2025-07-17'), y: 1686000 },
    { x: new Date('2025-07-18'), y: 1686000 },
    { x: new Date('2025-07-19'), y: 1686000 },
    { x: new Date('2025-07-21'), y: 1697000 },
    { x: new Date('2025-07-22'), y: 1697000 },
    { x: new Date('2025-07-23'), y: 1712000 },
    { x: new Date('2025-07-24'), y: 1730000 },
    { x: new Date('2025-07-25'), y: 1698000 },
    { x: new Date('2025-07-26'), y: 1698000 },
    { x: new Date('2025-07-28'), y: 1703000 },
    { x: new Date('2025-07-29'), y: 1691000 },
    { x: new Date('2025-07-30'), y: 1682000 },
    { x: new Date('2025-07-31'), y: 1703000 },
    { x: new Date('2025-08-01'), y: 1680000 },
    { x: new Date('2025-08-02'), y: 1696000 },
    { x: new Date('2025-08-04'), y: 1719000 },
    { x: new Date('2025-08-05'), y: 1699000 },
    { x: new Date('2025-08-06'), y: 1614000 },
    { x: new Date('2025-08-07'), y: 1716000 },
    { x: new Date('2025-08-08'), y: 1706000 },
    { x: new Date('2025-08-09'), y: 1709000 },
    { x: new Date('2025-08-11'), y: 1706000 },
    { x: new Date('2025-08-11'), y: 1706000 },
    { x: new Date('2025-08-12'), y: 1691000 },
    { x: new Date('2025-08-13'), y: 1702000 },
    { x: new Date('2025-08-14'), y: 1699000 },
    { x: new Date('2025-08-15'), y: 1705000 },
    { x: new Date('2025-08-16'), y: 1676000 },
    { x: new Date('2025-08-18'), y: 1683000 }    ]
};

const bulanSingkat = ["Jan","Feb","Mar","Apr","Mei","Jun","Jul","Agu","Sep","Okt","Nov","Des"];

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,
      formatter: function (value) {
        const date = new Date(value);
        return `${date.getDate()} ${bulanSingkat[date.getMonth()]}`;
      }
    },
    min: undefined,
    max: undefined
  },
  yaxis: {
    tickAmount: 8,
    labels: {
      style: { fontSize: '12px' },
      offsetX: -15,
      formatter: function (value) {
        return new Intl.NumberFormat('id-ID', { maximumFractionDigits: 0 }).format(value);
      }
    }
  },
  grid: { padding: { left: -10, right: 0 } },
  tooltip: {
    x: {
      formatter: function (value) {
        const date = new Date(value);
        // Tooltip tetap pakai lengkap: 16 Juli 2025
        const bulanIndo = ["Januari","Februari","Maret","April","Mei","Juni","Juli","Agustus","September","Oktober","November","Desember"];
        return `${date.getDate()} ${bulanIndo[date.getMonth()]} ${date.getFullYear()}`;
      }
    },
    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);

window.addEventListener('load', () => chart.render().then(() => filterData('1')));

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 = months === 'all' ? new Date('2000-01-01') : new Date(new Date().setMonth(new Date().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: 'Harga Jual', data: filteredJual },
    { name: 'Harga Beli', data: filteredBeli }
  ]);

  chart.updateOptions({
    xaxis: {
      labels: {
        formatter: function (value) {
          const date = new Date(value);
          return `${date.getDate()} ${bulanSingkat[date.getMonth()]}`;
        }
      }
    },
  });
}

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');