let dataArr = [];
const myChart = echarts.init(document.getElementById("chart"));
const filename = "final__hashrate.json";
const periods = [
  "all time",
  "last 7 days",
  "last 28 days",
  "last 365 days",
  "last 2 years",
];

async function fetchDataForChart(selectedValue) {
  try {
    const apiEndpoint = `${apiURL}/get_json/${filename}?period=${selectedValue}`;
    const response = await fetch(apiEndpoint);
    if (!response.ok) {
      throw new Error(`HTTP error! status: ${response.status}`);
    }
    const dataArr = await response.json();
    initEchart(dataArr);
  } catch (error) {
    console.error("Fetching data failed:", error);
  }
}

function initEchart(dataArr) {
  const option = {
    backgroundColor: backgroundColor,
    tooltip: {
      ...tooltip,
      valueFormatter(value, index) {
        return nFormatter(value, 0);
      },
    },
    toolbox: toolboxParams,
    xAxis: {
      data: dataArr.map((row) => row.date),
      axisTick: axisTick,
      axisLabel: axisLabel,
      axisLine: axisLine,
    },
    grid: grid,
    dataZoom: dataZoom(0),
    yAxis: [
      {
        type: "value",
        name: "Hashrate (H/s)",
        nameLocation: "middle",
        nameGap: 30,
        nameTextStyle: textStyleMain,
        position: "left",
        alignTicks: true,
        axisTick: axisTick,
        splitLine: {
          show: false,
        },
        axisLine: axisLine,
        axisLabel: {
          fontSize: 12 * fontScale,
          color: textColor,
          formatter(value, index) {
            return nFormatter(value, 0);
          },
        },
      },
      {
        type: "value",
        name: "Difficulty",
        nameLocation: "middle",
        nameGap: 30,
        nameTextStyle: textStyleMain,
        axisTick: axisTick,
        position: "right",
        alignTicks: true,
        axisLine: axisLine,
        splitLine: {
          show: false,
        },
        axisLabel: {
          fontSize: 12 * fontScale,
          color: textColor,
          formatter(value, index) {
            return nFormatter(value, 0);
          },
        },
      },
    ],
    series: [
      {
        type: "line",
        name: "Hashrate",
        barCategoryGap: "0%",
        data: dataArr.map((row) => row.hashrate),
      },
      {
        type: "line",
        color: "red",
        id: "rolling-average",
        name: "MA28",
        showSymbol: false,
        barCategoryGap: "0%",
        data: dataArr.map((row) => row.hashrate28),
      },
      {
        type: "line",
        yAxisIndex: 1,
        name: "Difficulty",
        barCategoryGap: "0%",
        data: dataArr.map((row) => row.difficulty),
      },
    ],
  };

  myChart.setOption(option);
}

document.addEventListener("DOMContentLoaded", function () {
  let periodIndex = 2;
  periodDropdown(periods, periodIndex);
  fetchDataForChart(periods[periodIndex]);
  const selectElement = document.getElementById("select-period-dropdown");

  selectElement.addEventListener("change", function (event) {
    const selectedValue = event.target.value;
    fetchDataForChart(selectedValue);
  });
});