const MAX_COUNTDOWN = 60;

var countdown = MAX_COUNTDOWN;
var now = Date.now();
var eventsOnNow = [];
var eventsOnNext = [];

grist.ready({
    requiredAccess: 'read table'
  });

grist.onRecords(function (records) {
  eventsOnNow = [];
  eventsOnNext = [];
  now = Date.now();

  var i = 0;

  for (const r of records) {
    let privacy = r["video_privacy"];
    let videoNeeded = r["Video_team_attending"];

    if (privacy == "none" || videoNeeded == true) {
      let e = new Event(
        i++,
        r["title"],
        r["venue"],
        videoNeeded,
        privacy,
        r["Comments"],
        Date.parse(r["start_date"]),
        Date.parse(r["end_date"])
      );

      if (e.hasStarted()  && !e.hasEnded()) {
        eventsOnNow.push(e);
      } else if (!e.hasStarted() && !e.hasEnded()) {
        eventsOnNext.push(e);
      }
    }
  }

  eventsOnNow.sort((e1, e2) => {
    return (e1.timeUntilEnd() > e2.timeUntilEnd()) ? 1 : ((e2.timeUntilEnd() > e1.timeUntilEnd()) ? -1 : 0)
  });

  eventsOnNext.sort((e1, e2) => {
    return (e1.timeUntilStart() > e2.timeUntilStart()) ? 1 : ((e2.timeUntilStart() > e1.timeUntilStart()) ? -1 : 0)
  });

  populateList("happeningNow", eventsOnNow, false);
  populateList("happeningNext", eventsOnNext, true);

  window.setInterval(() => handleCountdown(), 1000);
});


grist.onOptions(function(options, interaction) {
  console.info("Options reloaded");
});

class Event {
  constructor(id, name, venue, videoNeeded, privacy, comments, startTime, endTime) {
    this.id = id;
    this.name = name;
    this.venue = venue;
    this.videoNeeded = videoNeeded;
    this.privacy = privacy;
    this.comments = comments;
    this.startTime = startTime;
    this.endTime = endTime;
  }

  hasStarted() {
    return this.startTime < now;
  }

  hasEnded() {
    return this.endTime < now;
  }

  timeUntilStart() {
    return new Date(this.startTime - now);
  }

  timeUntilEnd() {
    return new Date(this.endTime - now);
  }
}

function makeTextBold(text) {
  return "<b>" + text + "</b>";
}

function convertTimeToString(time) {
  // Using getHours() is bullshit for this usage, it won't include any days in the hours
  let hours = Math.floor(time / (1000 * 60 * 60));
  let minutes = time.getMinutes();

  return hours + " hours, " + minutes + " minutes";
}

function populateList(elementName, items, getStartsIn) {
  for (const i of items) {
    const col = document.createElement("div");
    col.setAttribute("class", "col-sm-12 col-md-3")

    const card = document.createElement("div");
    card.setAttribute("class", "card m-3")

    const cardHeader = document.createElement("div");
    cardHeader.setAttribute("class", "card-header")
    cardHeader.innerHTML = i.name;

    const list = document.createElement("ul");
    list.setAttribute("class", "list-group list-group-flush")

    list.setAttribute("id", i.id);

    var venue = document.createElement("ul");
    var videoNeeded = document.createElement("ul");
    var privacy = document.createElement("ul");
    var comments = document.createElement("ul");

    var timer = document.createElement("ul");

    venue.setAttribute("class", "list-group-item");
    videoNeeded.setAttribute("class", "list-group-item");
    privacy.setAttribute("class", "list-group-item");
    comments.setAttribute("class", "list-group-item");

    venue.innerHTML = "Venue: " + i.venue;
    videoNeeded.innerHTML = "Video Team Present: " + i.videoNeeded;
    privacy.innerHTML = "Privacy: " + i.privacy;
    comments.innerHTML = "Comment: " + i.comments;

    timer.setAttribute("class", "list-group-item");
    timer.setAttribute("id", i.id + "_time");
    if (getStartsIn) {
      timer.innerHTML = "Starts In: " + convertTimeToString(i.timeUntilStart()) + " (" + new Date(i.startTime).toLocaleString("en-GB", { timeZone: "UTC" }) + ")";

      // Red border if show starts in 15 minutes
      if (i.timeUntilStart() <= 15 * 60 * 1000){
        card.setAttribute("class", "card m-3 border border-5 border-danger");
        timer.setAttribute("class", "list-group-item text-danger");
      }
    } else {
      timer.innerHTML = "Ends In: " + convertTimeToString(i.timeUntilEnd()) + " (" + new Date(i.endTime).toLocaleString("en-GB", { timeZone: "UTC" }) + ")";
    }

    list.appendChild(venue);
    list.appendChild(videoNeeded);
    list.appendChild(privacy);
    if (i.comments) {
      list.appendChild(comments);
    }
    list.appendChild(timer);

    // Colour in any rows
    if (i.privacy != "public") {
      if (i.privacy == "none") {
        privacy.setAttribute("class", "list-group-item bg-danger")
        privacy.innerHTML = makeTextBold("Privacy: Do not record!");
      } else if (i.privacy == "review") {
        privacy.setAttribute("class", "list-group-item bg-warning")
        privacy.innerHTML = makeTextBold(privacy.innerHTML);
      }
    }

    if (i.comments) {
      comments.setAttribute("class", "list-group-item bg-info");
      comments.innerHTML = makeTextBold(comments.innerHTML);
    }

    if (i.videoNeeded == true) {
      videoNeeded.setAttribute("class", "list-group-item bg-warning");
      videoNeeded.innerHTML = makeTextBold(videoNeeded.innerHTML);
    }

    card.appendChild(cardHeader);
    card.appendChild(list);

    col.append(card);

    document.getElementById(elementName).appendChild(col);
  }
}

function handleCountdown() {
  countdown--;
  if (countdown == 0) {
    countdown = MAX_COUNTDOWN;
    window.location.reload();
  }

  let counterElement = document.getElementById("counter");
  counterElement.innerHTML = "Next refresh in " + countdown;
}