// Get our initial stream list and create streams
xhr = new XMLHttpRequest();
xhr.onreadystatechange = function() {
  if (this.readyState == 4 && this.status == 200) {
    processStreamList(JSON.parse(this.responseText));
  }
}

disabledPlayers = [];

// Auto-resize frames in a webcall interface
function webcallFrameResize() {
  // Figure out how many Frames are visible
  div_count = 0;

  document.querySelectorAll(".frame").forEach(
    function(element) {
      div_count += 1;
    }
  )

  // If none are visible, show placeholder text and bail
  if (div_count < 1) {
    document.querySelector("#placeholder").style.display = "block";
    return;
  }

  // Hide placeholder if any players are visible
  document.querySelector("#placeholder").style.display = "none";

  // Get player frame aspect ratio for fitting purposes
  const player_ar = 16 / 9;

  // Try arrangements until the best fit is found
  // Take the first column count that doesn't overflow height
  cols = 0
  for (let i = 1; i <= div_count; i++) {
    const frame_width = window.innerWidth / i;
    const frame_height = frame_width / player_ar;

    if (frame_height * Math.ceil(div_count / i) <= window.innerHeight) {
      cols = i;
      break;
    }
  }

  // Set frames to the appropriate width
  if (cols) {
    w = `${Math.floor(100 / cols)}%`;
  } else {
    w = `${Math.floor(window.innerHeight * player_ar)}px`;
  }

  document.querySelectorAll(".frame").forEach(
    function(element) {
      element.style.width = w;
    }
  )
}

function createPlayer(stream, muted, volume) {
  // Create frame
  var outer_div = document.createElement("div");
  outer_div.classList.add("frame");
  outer_div.id = `frame_${stream}`;

  // If we're putting name frames around players, make them
  // Also provide close buttons to nuke this player
  if (named_frames) {
    var tab_div = document.createElement("div");
    tab_div.classList.add("frame_tabs");
    outer_div.appendChild(tab_div);

    var name_div = document.createElement("div");
    name_div.classList.add("frame_name");
    name_div.innerHTML = `<a href="${stream}"> ${stream} </a>`;
    tab_div.appendChild(name_div);

    var button_div = document.createElement("div");
    button_div.classList.add("frame_buttons");
    button_div.innerHTML = `<a href="#close" onclick="closePlayer('${stream}'); return false"> &#10006; </a>`;
    tab_div.appendChild(button_div);
  }

  // Put the player div in the container
  var player_div = document.createElement("div");
  player_div.classList.add("player");
  player_div.id = stream;
  outer_div.appendChild(player_div);

  // Create a throbber for dead streams
  // We had this in the player div before, but it blinks every time the player reconnects
  // This hides under a backgroundless player so it's only visible when nothing's up
  throbber_div = document.createElement("div");
  throbber_div.id = "throbber";
  outer_div.appendChild(throbber_div);

  // Put container in document
  document.body.appendChild(outer_div);

  // Initialize OvenPlayer
  // We want as little interface stuff as possible, but we need to keep
  // volume controls around so that can't be hidden.
  player = OvenPlayer.create(stream, {
    currentProtocolOnly: true,
    showBigPlayButton: false,
    aspect: "16:9",
    autoStart: true,
    mute: muted,
    volume: volume,
    sources: [
      {
        label: stream,
        type: 'webrtc',
        file: `wss://${domain}:3334/${app_name}/${stream}`
      }
    ]
  });

  // Set player up to auto-restart if it stops
  // If a streamer goes offline, the player will be reaped
  player.stateManager = manageState;
  player.on("stateChanged", player.stateManager);

  // Run a resize
  if (named_frames) {
    webcallFrameResize();
  }
}

function manageState(data) {
  // This serves one purpose: keep attempting to start a live player if it stops
  if (data.newstate == "error") {
    setTimeout(this.setCurrentSource, 3000, 0);
  }
}

function closePlayer(containerId) {
  // Close the player
  destroyPlayerById(containerId);

  // Add this ID to the closed player list so we don't reopen it
  if (!disabledPlayers.includes(containerId)) {
    disabledPlayers.push(containerId);
  }
}

function destroyPlayerById(containerId) {
  // Tear down player
  player = OvenPlayer.getPlayerByContainerId(containerId);
  player.remove();

  // Delete frame
  document.getElementById(`frame_${containerId}`).remove();

  // Run our resize
  if (named_frames) {
    webcallFrameResize();
  }
}

function processStreamList(streams) {
  // Remove any closed player from the list
  disabledPlayers.forEach((i, index) => {
    var removeIndex = streams.indexOf(i);
    if (removeIndex !== -1) {
      streams.splice(removeIndex, 1);
    }
  })

  // Create any player in the list that doesn't have one
  streams.forEach((i, index) => {
    if (OvenPlayer.getPlayerByContainerId(i) == null) {
      createPlayer(i, true, 100);
    }
  })

  // Destroy any player not in the list
  var players = OvenPlayer.getPlayerList();
  players.forEach((p, index) => {
    if (!streams.includes(p.getContainerId())) {
      destroyPlayerById(p.getContainerId());
    }
  })
}

function requestStreamList() {
  xhr.open("GET", `https://${domain}/status/default/${app_name}/`)
  xhr.send()
}

// Set up each embed
function EmprexSetup() {
  // Pre-populate our disabled list if we have a param for it
  window.location.search.substr(1).split("&").forEach((s, index) => {
    tmp = s.split("=");
    if (tmp[0] == "disabled") {
      disabledPlayers = decodeURIComponent(tmp[1]).split(",");
    }
  })

  // Placeholder if nothing is live
  placeholder = document.createElement("div");
  placeholder.id = "placeholder";
  placeholder.innerHTML = "<img src='/assets/errorlogo.gif'><br />Waiting for a stream to start...";
  document.body.appendChild(placeholder);

  // Also resize elements to fill the frame
  // We try to debounce this so we're not editing the DOM 100x a second on resize
  resize_timeout = false;
  addEventListener("resize", function() {
    clearTimeout(resize_timeout);
    resize_timeout = setTimeout(webcallFrameResize, 250);
  })

  // Update streams every 5 seconds, and immediately
  requestStreamList();
  setInterval(requestStreamList, 5000);
}