function sortChange(sortValue) {
  var payload = JSON.stringify({ sort_order: sortValue });
  sendPost(payload);
  setTimeout(function () {
    location.reload();
    return false;
  }, 500);
}

// Updates video watch status when passed a video id and it's current state (ex if the video was unwatched but you want to mark it as watched you will pass "unwatched")
function updateVideoWatchStatus(input1, videoCurrentWatchStatus) {
  if (videoCurrentWatchStatus) {
    videoId = input1;
  } else if (input1.getAttribute("data-id")) {
    videoId = input1.getAttribute("data-id");
    videoCurrentWatchStatus = input1.getAttribute("data-status");
  }

  postVideoProgress(videoId, 0); // Reset video progress on watched/unwatched;
  removeProgressBar(videoId);

  if (videoCurrentWatchStatus == "watched") {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "unwatched");
    var payload = JSON.stringify({ un_watched: videoId });
    sendPost(payload);
  } else if (videoCurrentWatchStatus == "unwatched") {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "watched");
    var payload = JSON.stringify({ watched: videoId });
    sendPost(payload);
  }

  var watchButtons = document.getElementsByClassName("watch-button");
  for (let i = 0; i < watchButtons.length; i++) {
    if (watchButtons[i].getAttribute("data-id") == videoId) {
      watchButtons[i].outerHTML = watchStatusIndicator;
    }
  }
}

// Creates a watch status indicator when passed a video id and the videos watch status
function createWatchStatusIndicator(videoId, videoWatchStatus) {
  if (videoWatchStatus == "watched") {
    var seen = "seen";
    var title = "Mark as unwatched";
  } else if (videoWatchStatus == "unwatched") {
    var seen = "unseen";
    var title = "Mark as watched";
  }
  var watchStatusIndicator = `<img src="/static/img/icon-${seen}.svg" alt="${seen}-icon" data-id="${videoId}" data-status="${videoWatchStatus}" onclick="updateVideoWatchStatus(this)" class="watch-button" title="${title}">`;
  return watchStatusIndicator;
}

// function isWatched(youtube_id) {
//     var payload = JSON.stringify({'watched': youtube_id});
//     sendPost(payload);
//     var seenIcon = document.createElement('img');
//     seenIcon.setAttribute('src', "/static/img/icon-seen.svg");
//     seenIcon.setAttribute('alt', 'seen-icon');
//     seenIcon.setAttribute('id', youtube_id);
//     seenIcon.setAttribute('title', "Mark as unwatched");
//     seenIcon.setAttribute('onclick', "isUnwatched(this.id)");
//     seenIcon.classList = 'seen-icon';
//     document.getElementById(youtube_id).replaceWith(seenIcon);
// }

// Removes the progress bar when passed a video id
function removeProgressBar(videoId) {
  setProgressBar(videoId, 0, 1);
}

function isWatchedButton(button) {
  youtube_id = button.getAttribute("data-id");
  var payload = JSON.stringify({ watched: youtube_id });
  button.remove();
  sendPost(payload);
  setTimeout(function () {
    location.reload();
    return false;
  }, 1000);
}

// function isUnwatched(youtube_id) {
//     postVideoProgress(youtube_id, 0); // Reset video progress on unwatched;
//     var payload = JSON.stringify({'un_watched': youtube_id});
//     sendPost(payload);
//     var unseenIcon = document.createElement('img');
//     unseenIcon.setAttribute('src', "/static/img/icon-unseen.svg");
//     unseenIcon.setAttribute('alt', 'unseen-icon');
//     unseenIcon.setAttribute('id', youtube_id);
//     unseenIcon.setAttribute('title', "Mark as watched");
//     unseenIcon.setAttribute('onclick', "isWatched(this.id)");
//     unseenIcon.classList = 'unseen-icon';
//     document.getElementById(youtube_id).replaceWith(unseenIcon);
// }

function unsubscribe(id_unsub) {
  var payload = JSON.stringify({ unsubscribe: id_unsub });
  sendPost(payload);
  var message = document.createElement("span");
  message.innerText = "You are unsubscribed.";
  document.getElementById(id_unsub).replaceWith(message);
}

function subscribe(id_sub) {
  var payload = JSON.stringify({ subscribe: id_sub });
  sendPost(payload);
  var message = document.createElement("span");
  message.innerText = "You are subscribed.";
  document.getElementById(id_sub).replaceWith(message);
}

function changeView(image) {
  var sourcePage = image.getAttribute("data-origin");
  var newView = image.getAttribute("data-value");
  var payload = JSON.stringify({ change_view: sourcePage + ":" + newView });
  sendPost(payload);
  setTimeout(function () {
    location.reload();
    return false;
  }, 500);
}

function toggleCheckbox(checkbox) {
  // pass checkbox id as key and checkbox.checked as value
  var toggleId = checkbox.id;
  var toggleVal = checkbox.checked;
  var payloadDict = {};
  payloadDict[toggleId] = toggleVal;
  var payload = JSON.stringify(payloadDict);
  sendPost(payload);
  setTimeout(function () {
    var currPage = window.location.pathname;
    window.location.replace(currPage);
    return false;
  }, 500);
}

// download page buttons
function rescanPending() {
  var payload = JSON.stringify({ rescan_pending: true });
  animate("rescan-icon", "rotate-img");
  sendPost(payload);
  setTimeout(function () {
    checkMessages();
  }, 500);
}

function dlPending() {
  var payload = JSON.stringify({ dl_pending: true });
  animate("download-icon", "bounce-img");
  sendPost(payload);
  setTimeout(function () {
    checkMessages();
  }, 500);
}

function toIgnore(button) {
  var youtube_id = button.getAttribute("data-id");
  var payload = JSON.stringify({ ignore: youtube_id });
  sendPost(payload);
  document.getElementById("dl-" + youtube_id).remove();
}

function downloadNow(button) {
  var youtube_id = button.getAttribute("data-id");
  var payload = JSON.stringify({ dlnow: youtube_id });
  sendPost(payload);
  document.getElementById(youtube_id).remove();
  setTimeout(function () {
    checkMessages();
  }, 500);
}

function forgetIgnore(button) {
  var youtube_id = button.getAttribute("data-id");
  var payload = JSON.stringify({ forgetIgnore: youtube_id });
  sendPost(payload);
  document.getElementById("dl-" + youtube_id).remove();
}

function addSingle(button) {
  var youtube_id = button.getAttribute("data-id");
  var payload = JSON.stringify({ addSingle: youtube_id });
  sendPost(payload);
  document.getElementById("dl-" + youtube_id).remove();
  setTimeout(function () {
    checkMessages();
  }, 500);
}

function deleteQueue(button) {
  var to_delete = button.getAttribute("data-id");
  var payload = JSON.stringify({ deleteQueue: to_delete });
  sendPost(payload);
  setTimeout(function () {
    location.reload();
    return false;
  }, 1000);
}

function stopQueue() {
  var payload = JSON.stringify({ queue: "stop" });
  sendPost(payload);
  document.getElementById("stop-icon").remove();
}

function killQueue() {
  var payload = JSON.stringify({ queue: "kill" });
  sendPost(payload);
  document.getElementById("kill-icon").remove();
}

// settings page buttons
function manualImport() {
  var payload = JSON.stringify({ "manual-import": true });
  sendPost(payload);
  // clear button
  var message = document.createElement("p");
  message.innerText = "processing import";
  var toReplace = document.getElementById("manual-import");
  toReplace.innerHTML = "";
  toReplace.appendChild(message);
}

function reEmbed() {
  var payload = JSON.stringify({ "re-embed": true });
  sendPost(payload);
  // clear button
  var message = document.createElement("p");
  message.innerText = "processing thumbnails";
  var toReplace = document.getElementById("re-embed");
  toReplace.innerHTML = "";
  toReplace.appendChild(message);
}

function dbBackup() {
  var payload = JSON.stringify({ "db-backup": true });
  sendPost(payload);
  // clear button
  var message = document.createElement("p");
  message.innerText = "backing up archive";
  var toReplace = document.getElementById("db-backup");
  toReplace.innerHTML = "";
  toReplace.appendChild(message);
}

function dbRestore(button) {
  var fileName = button.getAttribute("data-id");
  var payload = JSON.stringify({ "db-restore": fileName });
  sendPost(payload);
  // clear backup row
  var message = document.createElement("p");
  message.innerText = "restoring from backup";
  var toReplace = document.getElementById(fileName);
  toReplace.innerHTML = "";
  toReplace.appendChild(message);
}

function fsRescan() {
  var payload = JSON.stringify({ "fs-rescan": true });
  sendPost(payload);
  // clear button
  var message = document.createElement("p");
  message.innerText = "File system scan in progress";
  var toReplace = document.getElementById("fs-rescan");
  toReplace.innerHTML = "";
  toReplace.appendChild(message);
}

function resetToken() {
  var payload = JSON.stringify({ "reset-token": true });
  sendPost(payload);
  var message = document.createElement("p");
  message.innerText = "Token revoked";
  document.getElementById("text-reveal").replaceWith(message);
}

// delete from file system
function deleteConfirm() {
  to_show = document.getElementById("delete-button");
  document.getElementById("delete-item").style.display = "none";
  to_show.style.display = "block";
}

function deleteVideo(button) {
  var to_delete = button.getAttribute("data-id");
  var to_redirect = button.getAttribute("data-redirect");
  var payload = JSON.stringify({ "delete-video": to_delete });
  sendPost(payload);
  setTimeout(function () {
    var redirect = "/channel/" + to_redirect;
    window.location.replace(redirect);
    return false;
  }, 1000);
}

function deleteChannel(button) {
  var to_delete = button.getAttribute("data-id");
  var payload = JSON.stringify({ "delete-channel": to_delete });
  sendPost(payload);
  setTimeout(function () {
    window.location.replace("/channel/");
    return false;
  }, 1000);
}

function deletePlaylist(button) {
  var playlist_id = button.getAttribute("data-id");
  var playlist_action = button.getAttribute("data-action");
  var payload = JSON.stringify({
    "delete-playlist": {
      "playlist-id": playlist_id,
      "playlist-action": playlist_action,
    },
  });
  sendPost(payload);
  setTimeout(function () {
    window.location.replace("/playlist/");
    return false;
  }, 1000);
}

function cancelDelete() {
  document.getElementById("delete-button").style.display = "none";
  document.getElementById("delete-item").style.display = "block";
}

// player
function createPlayer(button) {
  var videoId = button.getAttribute("data-id");
  var videoData = getVideoData(videoId);
  var videoProgress = getVideoProgress(videoId).position;
  var videoName = videoData.data.title;

  var videoTag = createVideoTag(videoData, videoProgress);

  var playlist = "";
  var videoPlaylists = videoData.data.playlist; // Array of playlists the video is in
  if (typeof videoPlaylists != "undefined") {
    var subbedPlaylists = getSubbedPlaylists(videoPlaylists); // Array of playlist the video is in that are subscribed
    if (subbedPlaylists.length != 0) {
      var playlistData = getPlaylistData(subbedPlaylists[0]); // Playlist data for first subscribed playlist
      var playlistId = playlistData.playlist_id;
      var playlistName = playlistData.playlist_name;
      var playlist = `<h5><a href="/playlist/${playlistId}/">${playlistName}</a></h5>`;
    }
  }

  var videoViews = formatNumbers(videoData.data.stats.view_count);

  var channelId = videoData.data.channel.channel_id;
  var channelName = videoData.data.channel.channel_name;

  removePlayer();
  // document.getElementById(videoId).outerHTML = ''; // Remove watch indicator from video info

  // If cast integration is enabled create cast button
  var castButton = "";
  if (videoData.config.application.enable_cast) {
    var castButton = `<google-cast-launcher id="castbutton"></google-cast-launcher>`;
  }

  // Watched indicator
  if (videoData.data.player.watched) {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "watched");
  } else {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "unwatched");
  }

  var playerStats = `<div class="thumb-icon player-stats"><img src="/static/img/icon-eye.svg" alt="views icon"><span>${videoViews}</span>`;
  if (videoData.data.stats.like_count) {
    var likes = formatNumbers(videoData.data.stats.like_count);
    playerStats += `<span>|</span><img src="/static/img/icon-thumb.svg" alt="thumbs-up"><span>${likes}</span>`;
  }
  if (
    videoData.data.stats.dislike_count &&
    videoData.config.downloads.integrate_ryd
  ) {
    var dislikes = formatNumbers(videoData.data.stats.dislike_count);
    playerStats += `<span>|</span><img class="dislike" src="/static/img/icon-thumb.svg" alt="thumbs-down"><span>${dislikes}</span>`;
  }
  playerStats += "</div>";

  const markup = `
    <div class="video-player" data-id="${videoId}">
        ${videoTag}
        <div class="player-title boxed-content">
            <img class="close-button" src="/static/img/icon-close.svg" alt="close-icon" data="${videoId}" onclick="removePlayer()" title="Close player">
            ${watchStatusIndicator}
            ${castButton}
            ${playerStats}
            <div class="player-channel-playlist">
                <h3><a href="/channel/${channelId}/">${channelName}</a></h3>
                ${playlist}
            </div>
            <a href="/video/${videoId}/"><h2 id="video-title">${videoName}</h2></a>
        </div>
    </div>
    `;
  const divPlayer = document.getElementById("player");
  divPlayer.innerHTML = markup;
}

// Add video tag to video page when passed a video id, function loaded on page load `video.html (115-117)`
function insertVideoTag(videoData, videoProgress) {
  var videoTag = createVideoTag(videoData, videoProgress);
  var videoMain = document.getElementsByClassName("video-main");
  videoMain[0].innerHTML = videoTag;
}

// Generates a video tag with subtitles when passed videoData and videoProgress.
function createVideoTag(videoData, videoProgress) {
  var videoId = videoData.data.youtube_id;
  var videoUrl = videoData.data.media_url;
  var videoThumbUrl = videoData.data.vid_thumb_url;
  var subtitles = "";
  var videoSubtitles = videoData.data.subtitles; // Array of subtitles
  if (
    typeof videoSubtitles != "undefined" &&
    videoData.config.downloads.subtitle
  ) {
    for (var i = 0; i < videoSubtitles.length; i++) {
      let label = videoSubtitles[i].name;
      if (videoSubtitles[i].source == "auto") {
        label += " - auto";
      }
      subtitles += `<track label="${label}" kind="subtitles" srclang="${videoSubtitles[i].lang}" src="${videoSubtitles[i].media_url}">`;
    }
  }

  var videoTag = `
    <video poster="${videoThumbUrl}" ontimeupdate="onVideoProgress()" onpause="onVideoPause()" onended="onVideoEnded()" controls autoplay width="100%" playsinline id="video-item">
        <source src="${videoUrl}#t=${videoProgress}" type="video/mp4" id="video-source" videoid="${videoId}">
        ${subtitles}
    </video>
    `;
  return videoTag;
}

// Gets video tag
function getVideoPlayer() {
  var videoElement = document.getElementById("video-item");
  return videoElement;
}

// Gets the video source tag
function getVideoPlayerVideoSource() {
  var videoPlayerVideoSource = document.getElementById("video-source");
  return videoPlayerVideoSource;
}

// Gets the current progress of the video currently in the player
function getVideoPlayerCurrentTime() {
  var videoElement = getVideoPlayer();
  if (videoElement != null) {
    return videoElement.currentTime;
  }
}

// Gets the video id of the video currently in the player
function getVideoPlayerVideoId() {
  var videoPlayerVideoSource = getVideoPlayerVideoSource();
  if (videoPlayerVideoSource != null) {
    return videoPlayerVideoSource.getAttribute("videoid");
  }
}

// Gets the duration of the video currently in the player
function getVideoPlayerDuration() {
  var videoElement = getVideoPlayer();
  if (videoElement != null) {
    return videoElement.duration;
  }
}

// Gets current watch status of video based on watch button
function getVideoPlayerWatchStatus() {
  var videoId = getVideoPlayerVideoId();
  var watched = false;

  var watchButtons = document.getElementsByClassName("watch-button");
  for (let i = 0; i < watchButtons.length; i++) {
    if (
      watchButtons[i].getAttribute("data-id") == videoId &&
      watchButtons[i].getAttribute("data-status") == "watched"
    ) {
      watched = true;
    }
  }
  return watched;
}

// Runs on video playback, marks video as watched if video gets to 90% or higher, sends position to api
function onVideoProgress() {
  var videoId = getVideoPlayerVideoId();
  var currentTime = getVideoPlayerCurrentTime();
  var duration = getVideoPlayerDuration();
  if ((currentTime % 10).toFixed(1) <= 0.2) {
    // Check progress every 10 seconds or else progress is checked a few times a second
    postVideoProgress(videoId, currentTime);
    if (!getVideoPlayerWatchStatus()) {
      // Check if video is already marked as watched
      if (watchedThreshold(currentTime, duration)) {
        updateVideoWatchStatus(videoId, "unwatched");
      }
    }
  }
}

// Runs on video end, marks video as watched
function onVideoEnded() {
  var videoId = getVideoPlayerVideoId();
  if (!getVideoPlayerWatchStatus()) {
    // Check if video is already marked as watched
    updateVideoWatchStatus(videoId, "unwatched");
  }
}

function watchedThreshold(currentTime, duration) {
  var watched = false;
  if (duration <= 1800) {
    // If video is less than 30 min
    if (currentTime / duration >= 0.9) {
      // Mark as watched at 90%
      var watched = true;
    }
  } else {
    // If video is more than 30 min
    if (currentTime >= duration - 120) {
      // Mark as watched if there is two minutes left
      var watched = true;
    }
  }
  return watched;
}

// Runs on video pause. Sends current position.
function onVideoPause() {
  var videoId = getVideoPlayerVideoId();
  var currentTime = getVideoPlayerCurrentTime();
  postVideoProgress(videoId, currentTime);
}

// Format numbers for frontend
function formatNumbers(number) {
  var numberUnformatted = parseFloat(number);
  if (numberUnformatted > 999999999) {
    var numberFormatted =
      (numberUnformatted / 1000000000).toFixed(1).toString() + "B";
  } else if (numberUnformatted > 999999) {
    var numberFormatted =
      (numberUnformatted / 1000000).toFixed(1).toString() + "M";
  } else if (numberUnformatted > 999) {
    var numberFormatted =
      (numberUnformatted / 1000).toFixed(1).toString() + "K";
  } else {
    var numberFormatted = numberUnformatted;
  }
  return numberFormatted;
}

// Gets video data when passed video ID
function getVideoData(videoId) {
  var apiEndpoint = "/api/video/" + videoId + "/";
  var videoData = apiRequest(apiEndpoint, "GET");
  return videoData;
}

// Gets channel data when passed channel ID
function getChannelData(channelId) {
  var apiEndpoint = "/api/channel/" + channelId + "/";
  var channelData = apiRequest(apiEndpoint, "GET");
  return channelData.data;
}

// Gets playlist data when passed playlist ID
function getPlaylistData(playlistId) {
  var apiEndpoint = "/api/playlist/" + playlistId + "/";
  var playlistData = apiRequest(apiEndpoint, "GET");
  return playlistData.data;
}

// Get video progress data when passed video ID
function getVideoProgress(videoId) {
  var apiEndpoint = "/api/video/" + videoId + "/progress/";
  var videoProgress = apiRequest(apiEndpoint, "GET");
  return videoProgress;
}

// Given an array of playlist ids it returns an array of subbed playlist ids from that list
function getSubbedPlaylists(videoPlaylists) {
  var subbedPlaylists = [];
  for (var i = 0; i < videoPlaylists.length; i++) {
    if (getPlaylistData(videoPlaylists[i]).playlist_subscribed) {
      subbedPlaylists.push(videoPlaylists[i]);
    }
  }
  return subbedPlaylists;
}

// Send video position when given video id and progress in seconds
function postVideoProgress(videoId, videoProgress) {
  var apiEndpoint = "/api/video/" + videoId + "/progress/";
  var duartion = getVideoPlayerDuration();
  if (!isNaN(videoProgress) && duartion != "undefined") {
    var data = {
      position: videoProgress,
    };
    if (videoProgress == 0) {
      apiRequest(apiEndpoint, "DELETE");
      // console.log("Deleting Video Progress for Video ID: " + videoId + ", Progress: " + videoProgress);
    } else if (!getVideoPlayerWatchStatus()) {
      apiRequest(apiEndpoint, "POST", data);
      // console.log("Saving Video Progress for Video ID: " + videoId + ", Progress: " + videoProgress);
    }
  }
}

// Makes api requests when passed an endpoint and method ("GET", "POST", "DELETE")
function apiRequest(apiEndpoint, method, data) {
  const xhttp = new XMLHttpRequest();
  var sessionToken = getCookie("sessionid");
  xhttp.open(method, apiEndpoint, false);
  xhttp.setRequestHeader("X-CSRFToken", getCookie("csrftoken")); // Used for video progress POST requests
  xhttp.setRequestHeader("Authorization", "Token " + sessionToken);
  xhttp.setRequestHeader("Content-Type", "application/json");
  xhttp.send(JSON.stringify(data));
  return JSON.parse(xhttp.responseText);
}

// Gets origin URL
function getURL() {
  return window.location.origin;
}

function removePlayer() {
  var currentTime = getVideoPlayerCurrentTime();
  var duration = getVideoPlayerDuration();
  var videoId = getVideoPlayerVideoId();
  postVideoProgress(videoId, currentTime);
  setProgressBar(videoId, currentTime, duration);
  var playerElement = document.getElementById("player");
  if (playerElement.hasChildNodes()) {
    var youtubeId = playerElement.childNodes[1].getAttribute("data-id");
    var playedStatus = document.createDocumentFragment();
    var playedBox = document.getElementById(youtubeId);
    if (playedBox) {
      playedStatus.appendChild(playedBox);
    }
    playerElement.innerHTML = "";
    // append played status
    var videoInfo = document.getElementById("video-info-" + youtubeId);
    videoInfo.insertBefore(playedStatus, videoInfo.firstChild);
  }
}

// Sets the progress bar when passed a video id, video progress and video duration
function setProgressBar(videoId, currentTime, duration) {
  var progressBarWidth = (currentTime / duration) * 100 + "%";
  var progressBars = document.getElementsByClassName("video-progress-bar");
  for (let i = 0; i < progressBars.length; i++) {
    if (progressBars[i].id == "progress-" + videoId) {
      if (!getVideoPlayerWatchStatus()) {
        progressBars[i].style.width = progressBarWidth;
      } else {
        progressBars[i].style.width = "0%";
      }
    }
  }

  // progressBar = document.getElementById("progress-" + videoId);
}

// multi search form
function searchMulti(query) {
  if (query.length > 1) {
    var payload = JSON.stringify({ multi_search: query });
    var http = new XMLHttpRequest();
    http.onreadystatechange = function () {
      if (http.readyState === 4) {
        allResults = JSON.parse(http.response).results;
        populateMultiSearchResults(allResults);
      }
    };
    http.open("POST", "/process/", true);
    http.setRequestHeader("X-CSRFToken", getCookie("csrftoken"));
    http.setRequestHeader("Content-type", "application/json");
    http.send(payload);
  }
}

function getViewDefaults(view) {
  var defaultView = document.getElementById("id_" + view).value;
  return defaultView;
}

function populateMultiSearchResults(allResults) {
  // videos
  var defaultVideo = getViewDefaults("home");
  var allVideos = allResults.video_results;
  var videoBox = document.getElementById("video-results");
  videoBox.innerHTML = "";
  for (let index = 0; index < allVideos.length; index++) {
    const video = allVideos[index].source;
    const videoDiv = createVideo(video, defaultVideo);
    videoBox.appendChild(videoDiv);
  }
  // channels
  var defaultChannel = getViewDefaults("channel");
  var allChannels = allResults.channel_results;
  var channelBox = document.getElementById("channel-results");
  channelBox.innerHTML = "";
  for (let index = 0; index < allChannels.length; index++) {
    const channel = allChannels[index].source;
    const channelDiv = createChannel(channel, defaultChannel);
    channelBox.appendChild(channelDiv);
  }
  // playlists
  var defaultPlaylist = getViewDefaults("playlist");
  var allPlaylists = allResults.playlist_results;
  var playlistBox = document.getElementById("playlist-results");
  playlistBox.innerHTML = "";
  for (let index = 0; index < allPlaylists.length; index++) {
    const playlist = allPlaylists[index].source;
    const playlistDiv = createPlaylist(playlist, defaultPlaylist);
    playlistBox.appendChild(playlistDiv);
  }
}

function createVideo(video, viewStyle) {
  // create video item div from template
  const videoId = video.youtube_id;
  const mediaUrl = video.media_url;
  const thumbUrl = "/cache/" + video.vid_thumb_url;
  const videoTitle = video.title;
  const videoPublished = video.published;
  const videoDuration = video.player.duration_str;
  if (video.player.watched) {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "watched");
  } else {
    var watchStatusIndicator = createWatchStatusIndicator(videoId, "unwatched");
  }
  const channelId = video.channel.channel_id;
  const channelName = video.channel.channel_name;
  // build markup
  const markup = `
    <a href="#player" data-src="/media/${mediaUrl}" data-thumb="${thumbUrl}" data-title="${videoTitle}" data-channel="${channelName}" data-channel-id="${channelId}" data-id="${videoId}" onclick="createPlayer(this)">
        <div class="video-thumb-wrap ${viewStyle}">
            <div class="video-thumb">
                <img src="${thumbUrl}" alt="video-thumb">
            </div>
            <div class="video-play">
                <img src="/static/img/icon-play.svg" alt="play-icon">
            </div>
        </div>
    </a>
    <div class="video-desc ${viewStyle}">
        <div class="video-desc-player" id="video-info-${videoId}">
                ${watchStatusIndicator}
            <span>${videoPublished} | ${videoDuration}</span>
        </div>
        <div>
            <a href="/channel/${channelId}/"><h3>${channelName}</h3></a>
            <a class="video-more" href="/video/${videoId}/"><h2>${videoTitle}</h2></a>
        </div>
    </div>
    `;
  const videoDiv = document.createElement("div");
  videoDiv.setAttribute("class", "video-item " + viewStyle);
  videoDiv.innerHTML = markup;
  return videoDiv;
}

function createChannel(channel, viewStyle) {
  // create channel item div from template
  const channelId = channel.channel_id;
  const channelName = channel.channel_name;
  const channelSubs = channel.channel_subs;
  const channelLastRefresh = channel.channel_last_refresh;
  if (channel.channel_subscribed) {
    var button = `<button class="unsubscribe" type="button" id="${channelId}" onclick="unsubscribe(this.id)" title="Unsubscribe from ${channelName}">Unsubscribe</button>`;
  } else {
    var button = `<button type="button" id="${channelId}" onclick="subscribe(this.id)" title="Subscribe to ${channelName}">Subscribe</button>`;
  }
  // build markup
  const markup = `
    <div class="channel-banner ${viewStyle}">
        <a href="/channel/${channelId}/">
            <img src="/cache/channels/${channelId}_banner.jpg" alt="${channelId}-banner">
        </a>
    </div>
    <div class="info-box info-box-2 ${viewStyle}">
        <div class="info-box-item">
            <div class="round-img">
                <a href="/channel/${channelId}/">
                    <img src="/cache/channels/${channelId}_thumb.jpg" alt="channel-thumb">
                </a>
            </div>
            <div>
                <h3><a href="/channel/${channelId}/">${channelName}</a></h3>
                <p>Subscribers: ${channelSubs}</p>
            </div>
        </div>
        <div class="info-box-item">
            <div>
                <p>Last refreshed: ${channelLastRefresh}</p>
                ${button}
            </div>
        </div>
    </div>
    `;
  const channelDiv = document.createElement("div");
  channelDiv.setAttribute("class", "channel-item " + viewStyle);
  channelDiv.innerHTML = markup;
  return channelDiv;
}

function createPlaylist(playlist, viewStyle) {
  // create playlist item div from template
  const playlistId = playlist.playlist_id;
  const playlistName = playlist.playlist_name;
  const playlistChannelId = playlist.playlist_channel_id;
  const playlistChannel = playlist.playlist_channel;
  const playlistLastRefresh = playlist.playlist_last_refresh;
  if (playlist.playlist_subscribed) {
    var button = `<button class="unsubscribe" type="button" id="${playlistId}" onclick="unsubscribe(this.id)" title="Unsubscribe from ${playlistName}">Unsubscribe</button>`;
  } else {
    var button = `<button type="button" id="${playlistId}" onclick="subscribe(this.id)" title="Subscribe to ${playlistName}">Subscribe</button>`;
  }
  const markup = `
    <div class="playlist-thumbnail">
        <a href="/playlist/${playlistId}/">
            <img src="/cache/playlists/${playlistId}.jpg" alt="${playlistId}-thumbnail">
        </a>
    </div>
    <div class="playlist-desc ${viewStyle}">
        <a href="/channel/${playlistChannelId}/"><h3>${playlistChannel}</h3></a>
        <a href="/playlist/${playlistId}/"><h2>${playlistName}</h2></a>
        <p>Last refreshed: ${playlistLastRefresh}</p>
        ${button}
    </div>
    `;
  const playlistDiv = document.createElement("div");
  playlistDiv.setAttribute("class", "playlist-item " + viewStyle);
  playlistDiv.innerHTML = markup;
  return playlistDiv;
}

// generic
function sendPost(payload) {
  var http = new XMLHttpRequest();
  http.open("POST", "/process/", true);
  http.setRequestHeader("X-CSRFToken", getCookie("csrftoken"));
  http.setRequestHeader("Content-type", "application/json");
  http.send(payload);
}

function getCookie(c_name) {
  if (document.cookie.length > 0) {
    c_start = document.cookie.indexOf(c_name + "=");
    if (c_start != -1) {
      c_start = c_start + c_name.length + 1;
      c_end = document.cookie.indexOf(";", c_start);
      if (c_end == -1) c_end = document.cookie.length;
      return unescape(document.cookie.substring(c_start, c_end));
    }
  }
  return "";
}

// animations
function textReveal() {
  var textBox = document.getElementById("text-reveal");
  var button = document.getElementById("text-reveal-button");
  var textBoxHeight = textBox.style.height;
  if (textBoxHeight === "unset") {
    textBox.style.height = "0px";
    button.innerText = "Show";
  } else {
    textBox.style.height = "unset";
    button.innerText = "Hide";
  }
}

function showForm() {
  var formElement = document.getElementById("hidden-form");
  var displayStyle = formElement.style.display;
  if (displayStyle === "") {
    formElement.style.display = "block";
  } else {
    formElement.style.display = "";
  }
  animate("animate-icon", "pulse-img");
}

function showOverwrite() {
  var overwriteDiv = document.getElementById("overwrite-form");
  if (overwriteDiv.classList.contains("hidden-overwrite")) {
    overwriteDiv.classList.remove("hidden-overwrite");
  } else {
    overwriteDiv.classList.add("hidden-overwrite");
  }
}

function animate(elementId, animationClass) {
  var toAnimate = document.getElementById(elementId);
  if (toAnimate.className !== animationClass) {
    toAnimate.className = animationClass;
  } else {
    toAnimate.classList.remove(animationClass);
  }
}