function getSortBy() {
  let sortByLastCommitInput = document.getElementById("sortByDate");
  if (sortByLastCommitInput === null) {
    return "date";
  } else {
    return sortByLastCommitInput.checked ? "date" : "stars";
  }
}

function getTagSortBy() {
  let tagSortByNumThemes = document.getElementById("tagSortByNumThemes");
  if (tagSortByNumThemes === null) {
    return "numThemes";
  } else {
    return tagSortByNumThemes.checked ? "numThemes" : "name";
  }
}

function getFeatureSortBy() {
  let featureSortByNumThemes = document.getElementById(
    "featureSortByNumThemes"
  );
  if (featureSortByNumThemes === null) {
    return "numThemes";
  } else {
    return featureSortByNumThemes.checked ? "numThemes" : "name";
  }
}

function getSortedThemes(themeList, sortedBy) {
  if (sortedBy === "date") {
    return themeList.sort((a, b) => b.date_in_seconds - a.date_in_seconds);
  } else {
    return themeList.sort((a, b) => b.num_stars - a.num_stars);
  }
}

function getSelectedTags() {
  let tagSelectionInputs = document.getElementsByClassName("tagSelectionInput");
  if (tagSelectionInputs.length > 0) {
    return [...tagSelectionInputs].filter((x) => x.checked).map((y) => y.value);
  } else {
    return [];
  }
}

function getSelectedFeatures() {
  let featureSelectionInputs = document.getElementsByClassName(
    "featureSelectionInput"
  );
  if (featureSelectionInputs.length > 0) {
    return [...featureSelectionInputs]
      .filter((x) => x.checked)
      .map((y) => y.value);
  } else {
    return [];
  }
}

function getFilteredThemes(selectedTags, selectedFeatures) {
  if (selectedTags.length === 0 && selectedFeatures.length === 0) {
    return themes;
  } else {
    return themes
      .filter((x) => selectedTags.every((y) => x.tags.includes(y)))
      .filter((z) => selectedFeatures.every((w) => z.features.includes(w)));
  }
}

function buildResults() {
  let resultsDiv = document.getElementById("results");
  resultsDiv.innerHTML = "";
  let resultsTable = document.createElement("table");
  resultsTable.id = "resultsTable";
  resultsTable.style.border = "1px solid black";
  resultsTable.style.fontSize = ".9rem";

  let resultsTableHeadRow = document.createElement("tr");
  resultsDiv.appendChild(resultsTable);
  resultsTable.appendChild(resultsTableHeadRow);

  let themeTH = document.createElement("th");
  themeTH.innerHTML = "theme";
  resultsTableHeadRow.appendChild(themeTH);

  let dateTH = document.createElement("th");
  dateTH.innerHTML = "date";
  resultsTableHeadRow.appendChild(dateTH);

  let starsTH = document.createElement("th");
  starsTH.innerHTML = "stars";
  resultsTableHeadRow.appendChild(starsTH);

  let commitTH = document.createElement("th");
  commitTH.innerHTML = "commit";
  resultsTableHeadRow.appendChild(commitTH);

  let selectedTags = getSelectedTags();
  let selectedFeatures = getSelectedFeatures();
  let sortedBy = getSortBy();
  let filtered_themes = getFilteredThemes(selectedTags, selectedFeatures);
  let sorted_themes = getSortedThemes(filtered_themes, sortedBy);
  sorted_themes.forEach((theme) => addThemeTableRow(theme));

  buildSelectionMenu(sorted_themes, sortedBy, selectedTags, selectedFeatures);
}

buildResults();