// Has to be in the head tag, otherwise a flicker effect will occur.

// Toggle through light, dark, and system theme settings.
let toggleThemeSetting = () => {
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    setThemeSetting("light");
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    setThemeSetting("dark");
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    setThemeSetting("system");
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};

// Change the theme setting and apply the theme.
let setThemeSetting = (themeSetting) => {
  localStorage.setItem("theme", themeSetting);

  document.documentElement.setAttribute("data-theme-setting", themeSetting);

  applyTheme();
};

// Apply the computed dark or light theme to the website.
let applyTheme = () => {
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  transTheme();
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  setGiscusTheme(theme);
  setSearchTheme(theme);

  // if mermaid is not defined, do nothing
  if (typeof mermaid !== "undefined") {
    setMermaidTheme(theme);
  }

  // if diff2html is not defined, do nothing
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    setDiff2htmlTheme(theme);
  }

  // if echarts is not defined, do nothing
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    setEchartsTheme(theme);
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  // if Plotly is not defined, do nothing
  if (typeof Plotly !== "undefined") {
    setPlotlyTheme(theme);
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  // if vegaEmbed is not defined, do nothing
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    setVegaLiteTheme(theme);
  }

  document.documentElement.setAttribute("data-theme", theme);

  // Add class to tables.
  let tables = document.getElementsByTagName("table");
  for (let i = 0; i < tables.length; i++) {
    if (theme == "dark") {
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      tables[i].classList.remove("table-dark");
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  // Set jupyter notebooks themes.
  let jupyterNotebooks = document.getElementsByClassName("jupyter-notebook-iframe-container");
  for (let i = 0; i < jupyterNotebooks.length; i++) {
    let bodyElement = jupyterNotebooks[i].getElementsByTagName("iframe")[0].contentWindow.document.body;
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  // Updates the background of medium-zoom overlay.
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    medium_zoom.update({
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};

let setHighlight = (theme) => {
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    document.getElementById("highlight_theme_dark").media = "";
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};

let setGiscusTheme = (theme) => {
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};

let addMermaidZoom = (records, observer) => {
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};

let setMermaidTheme = (theme) => {
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  /* Re-render the SVG, based on https://github.com/cotes2020/jekyll-theme-chirpy/blob/master/_includes/mermaid.html */
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};

let setDiff2htmlTheme = (theme) => {
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    let textData = elem.previousSibling.childNodes[0].innerHTML;
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    const configuration = { colorScheme: theme, drawFileList: true, highlight: true, matching: "lines" };
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};

let setEchartsTheme = (theme) => {
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    let jsonData = elem.previousSibling.childNodes[0].innerHTML;
    echarts.dispose(elem);

    if (theme === "dark") {
      var chart = echarts.init(elem, "dark-fresh-cut");
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      var chart = echarts.init(elem);
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    chart.setOption(JSON.parse(jsonData));
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};

let setPlotlyTheme = (theme) => {
  document.querySelectorAll(".js-plotly-plot").forEach((elem) => {
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    let jsonData = JSON.parse(elem.previousSibling.childNodes[0].innerHTML);

    if (theme === "dark") {
      // dark theme extracted from https://github.com/plotly/plotly.py/blob/main/plotly/package_data/templates/plotly_dark.json?raw=true
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      const plotlyLightLayout = 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      // if jsonData.layout exists, then update the theme
      if (jsonData.layout) {
        if (jsonData.layout.template) {
          jsonData.layout.template = { ...plotlyLightLayout, ...jsonData.layout.template };
        } else {
          jsonData.layout.template = plotlyLightLayout;
        }
      } else {
        jsonData.layout = { template: plotlyLightLayout };
      }
    }

    Plotly.relayout(elem, jsonData.layout);
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};

let setVegaLiteTheme = (theme) => {
  document.querySelectorAll(".vega-lite").forEach((elem) => {
    // Get the code block content from previous element, since it is the vega lite code itself as defined in Markdown, but it is hidden
    let jsonData = elem.previousSibling.childNodes[0].innerHTML;
    elem.innerHTML = "";
    if (theme === "dark") {
      vegaEmbed(elem, JSON.parse(jsonData), { theme: "dark" });
    } else {
      vegaEmbed(elem, JSON.parse(jsonData));
    }
  });
};

let setSearchTheme = (theme) => {
  const ninjaKeys = document.querySelector("ninja-keys");
  if (!ninjaKeys) return;

  if (theme === "dark") {
    ninjaKeys.classList.add("dark");
  } else {
    ninjaKeys.classList.remove("dark");
  }
};

let transTheme = () => {
  document.documentElement.classList.add("transition");
  window.setTimeout(() => {
    document.documentElement.classList.remove("transition");
  }, 500);
};

// Determine the expected state of the theme toggle, which can be "dark", "light", or
// "system". Default is "system".
let determineThemeSetting = () => {
  let themeSetting = localStorage.getItem("theme");
  if (themeSetting != "dark" && themeSetting != "light" && themeSetting != "system") {
    themeSetting = "system";
  }
  return themeSetting;
};

// Determine the computed theme, which can be "dark" or "light". If the theme setting is
// "system", the computed theme is determined based on the user's system preference.
let determineComputedTheme = () => {
  let themeSetting = determineThemeSetting();
  if (themeSetting == "system") {
    const userPref = window.matchMedia;
    if (userPref && userPref("(prefers-color-scheme: dark)").matches) {
      return "dark";
    } else {
      return "light";
    }
  } else {
    return themeSetting;
  }
};

let initTheme = () => {
  let themeSetting = determineThemeSetting();

  setThemeSetting(themeSetting);

  // Add event listener to the theme toggle button.
  document.addEventListener("DOMContentLoaded", function () {
    const mode_toggle = document.getElementById("light-toggle");

    mode_toggle.addEventListener("click", function () {
      toggleThemeSetting();
    });
  });

  // Add event listener to the system theme preference change.
  window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", ({ matches }) => {
    applyTheme();
  });
};
