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;

  console.info(records);

  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)
  });

  console.log(eventsOnNext);

  populateTable("now", eventsOnNow);
  populateTable("next", eventsOnNext);

  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));
  if (hours < 10) {
    hours = "0" + hours
  }

  let minutes = time.getMinutes();
  if (minutes < 10) {
    minutes = "0" + minutes
  }
  return hours + ":" + minutes;
}

function populateTable(elementName, items) {
  for (const i of items) {
    const tableRow = document.createElement("tr");

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

    var name = document.createElement("td");
    var venue = document.createElement("td");
    var videoNeeded = document.createElement("td");
    var privacy = document.createElement("td");
    var comments = document.createElement("td");
    var startsIn = document.createElement("td");

    startsIn.setAttribute("id", i.id + "_time");

    name.innerHTML = i.name;
    venue.innerHTML = i.venue;
    videoNeeded.innerHTML = i.videoNeeded;
    privacy.innerHTML = i.privacy;
    comments.innerHTML = i.comments;
    startsIn.innerHTML = convertTimeToString(i.timeUntilStart());

    tableRow.appendChild(name);
    tableRow.appendChild(venue);
    tableRow.appendChild(videoNeeded);
    tableRow.appendChild(privacy);
    tableRow.appendChild(comments);
    tableRow.appendChild(startsIn);

    // Colour in any rows
    if (i.privacy != "public") {
      privacy.innerHTML = makeTextBold(privacy.innerHTML);

      if (i.privacy == "none") {
        tableRow.setAttribute("class", "table-danger");
      } else if (i.privacy == "review") {
        tableRow.setAttribute("class", "table-warning");
      }
    }

    if (i.comments != "") {
      comments.innerHTML = makeTextBold(comments.innerHTML);
      tableRow.setAttribute("class", "table-danger");
    }

    if (i.videoNeeded == true) {
      videoNeeded.innerHTML = makeTextBold(videoNeeded.innerHTML);
      tableRow.setAttribute("class", "table-danger");
    }

    document.getElementById(elementName).getElementsByTagName("tbody")[0].append(tableRow);
  }
}

function refreshTables() {
  var toDelete = [];

  now = Date.now();
  for (const nowItem of eventsOnNow) {
    let timeUntilEnd = nowItem.timeUntilEnd();

    let timeField = document.getElementById(nowItem.id + "_time");
    timeField.innerHTML = convertTimeToString(nowItem.timeUntilEnd());
  }

  for (const nextItem of eventsOnNext) {
    let timeField = document.getElementById(nextItem.id + "_time");
    timeField.innerHTML = convertTimeToString(nextItem.timeUntilEnd());
  }
}

function handleCountdown() {
  countdown--;
  if (countdown == 0) {
    countdown = MAX_COUNTDOWN;
    refreshTables();
  }

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