const Fuse = window.Fuse;

const searchInput = document.querySelector("#searchbar");
const mainContentTags = document.getElementsByTagName("main");
const searchResultsDiv = document.querySelector("#searchResults");
const currentFile =
  document.querySelector("meta[name='doc-current-file']").attributes
    .getNamedItem("content").value;
const pathToRoot = "../".repeat(
  currentFile ? (currentFile.split("/").length + 1) : 0,
);
searchInput.removeAttribute("style");

const SEARCH_INDEX = window.DENO_DOC_SEARCH_INDEX;

const fuse = new Fuse(SEARCH_INDEX.nodes, {
  keys: [{
    name: "name",
    weight: 2,
  }],
  isCaseSensitive: false,
  minMatchCharLength: 2,
  threshold: 0.4,
});

const loadedUrl = new URL(window.location.href);
const val = loadedUrl.searchParams.get("q");
if (val) {
  searchInput.value = val;
  doSearch(val);
}

window.addEventListener("load", function () {
  document.addEventListener("keydown", function (event) {
    if (event.key.toLowerCase() === "s") {
      if (event.target !== searchInput) {
        searchInput.focus();
        event.preventDefault();
      }
    }
  });

  const emptyPlaceholder = "Click or press 'S' to search...";
  searchInput.placeholder = emptyPlaceholder;

  searchInput.addEventListener("focus", function () {
    searchInput.placeholder = "Type your query here...";
  });

  searchInput.addEventListener("blur", function () {
    searchInput.placeholder = emptyPlaceholder;
  });
});

function debounce(func, delay) {
  let timerId;

  return function () {
    const context = this;
    const args = arguments;

    clearTimeout(timerId);

    timerId = setTimeout(function () {
      func.apply(context, args);
    }, delay);
  };
}

const debouncedSearch = debounce(doSearch, 250);

searchInput.addEventListener("input", (e) => {
  const val = e.target.value;
  debouncedSearch(val);
});

function doSearch(val) {
  if (!val) {
    updateCurrentLocation(val);
    showPage();
  } else {
    const results = searchInIndex(val);
    // console.log("results", results);
    updateCurrentLocation(val);
    renderResults(results);
    showSearchResults();
  }
}

function updateCurrentLocation(val) {
  const url = new URL(window.location.href);
  if (val) {
    url.searchParams.set("q", val);
  } else {
    url.searchParams.delete("q");
  }
  window.history.replaceState({}, "", url.href);
}

function showPage() {
  for (const mainTag of mainContentTags) {
    mainTag.style.display = "block";
  }
  searchResultsDiv.style.display = "none";
}

function showSearchResults() {
  for (const mainTag of mainContentTags) {
    mainTag.style.display = "none";
  }
  searchResultsDiv.style.display = "block";
}

function renderResults(results) {
  if (results.length === 0) {
    searchResultsDiv.innerHTML = `<span>No result</span>`;
    return;
  }

  let html = `<ul>`;

  for (const result of results) {
    const kind = result.kind.map((kind) => {
      const [rustKind, title, symbol] = docNodeKindToStringVariants(kind);
      return `<div class="text-${rustKind} bg-${rustKind}/15" title="${title}">${symbol}</div>`;
    }).join("");

    html += `<li class="block">
<a href="${pathToRoot}${result.file}/~/${result.name}.html" class="flex rounded-lg gap-4 items-center justify-between py-2 px-3 hover:bg-stone-100">
    <div class="flex items-center gap-2.5">
      <div class="docNodeKindIcon">
        ${kind}
      </div>
      <span class="text-sm leading-none">${result.name}</span>
    </div>
    <div class="text-xs italic text-stone-400 overflow-hidden whitespace-nowrap text-ellipsis">${result.location.filename}:${result.location.line}</div>
</a>
</li>`;
  }

  html += `</ul>`;
  searchResultsDiv.innerHTML = html;
}

function searchInIndex(val) {
  return fuse.search(val).map((result) => result.item);
}

function docNodeKindToStringVariants(kind) {
  switch (kind) {
    case "function":
      return ["Function", "Function", "f"];
    case "variable":
      return ["Variable", "Variable", "v"];
    case "class":
      return ["Class", "Class", "c"];
    case "enum":
      return ["Enum", "Enum", "E"];
    case "interface":
      return ["Interface", "Interface", "I"];
    case "typeAlias":
      return ["TypeAlias", "Type Alias", "T"];
    case "namespace":
      return ["Namespace", "Namespace", "N"];
    default:
      return [];
  }
}