"use strict";

/*
 * Deals with controlling time.
 *
 * More specifically: replaying of past events, fast forwarding, pausing,
 * etc.
 *
 * The interface is a bit bloated at the moment, though.
 */
var nmsTime = nmsTime || {
  _now: undefined,
  _handle: undefined,
  _stopTime: undefined,
};

nmsTime.replayEvent = function () {
  var eStart = setTree(
    nmsData,
    ["config", "config", "data", "start"],
    "2018-03-23T00:00:00+0200"
  );
  nmsTime._stopTime = new Date(
    setTree(
      nmsData,
      ["config", "config", "data", "end"],
      "2018-04-01T14:30:00+0200"
    )
  );
  nmsTime.setNow(eStart);
  nmsTime.startPlayback(60);
};

nmsTime.isRealTime = function () {
  if (nmsTime._now == undefined && nmsTime._handle == undefined) return true;
  return false;
};

nmsTime.startNowPicker = function () {
  $.datetimepicker.setLocale("no");
  $("#nowPicker").datetimepicker("destroy");
  var now;
  if (nmsTime._now == undefined) now = new Date();
  else now = nmsTime._now;
  now.setSeconds(0);
  now.setMilliseconds(0);
  var datepicker = $("#nowPicker").datetimepicker({
    value: now,
    step: 1,
    mask: false,
    inline: true,
    todayButton: true,
    validateOnBlur: false,
    dayOfWeekStart: 1,
    maxDate: "+1970/01/01",
    onSelectDate: function (ct, $i) {
      document.getElementById("nowPicker").dataset.iso = new Date(ct.valueOf());
    },
    onSelectTime: function (ct, $i) {
      document.getElementById("nowPicker").dataset.iso = new Date(ct.valueOf());
    },
    onGenerate: function (ct, $i) {
      document.getElementById("nowPicker").dataset.iso = new Date(ct.valueOf());
    },
  });
};

nmsTime.setNow = function (now) {
  var newDate = new Date(now);
  newDate.setSeconds(0);
  newDate.setMilliseconds(0);
  newDate.setMinutes(newDate.getMinutes() - (newDate.getMinutes() % 1));
  nmsTime._now = newDate;
  nmsTime._updateData();
};

nmsTime._updateData = function () {
  nmsData.now = nmsTime._now.getTime() / 1000;
};

nmsTime.realTime = function () {
  nmsTime.stopPlayback();
  nmsTime._now = undefined;
  nmsData.now = undefined;
};

/*
 * Step a fixed amount of time, measured in minutes.
 *
 * Try to align this to whole 5 minutes. It will be enforced in future
 * backend versions to avoid bloating the cache and thus also stressing the
 * database
 */
nmsTime.step = function (amount) {
  if (nmsTime._now == null) throw "Stepping without nmsTime._now";
  if (amount == 0 || amount == undefined) throw "Invalid step";
  if (nmsTime._now.getTime() + amount * 1000 * 60 > Date.now()) {
    nmsTime.realTime();
    return;
  }
  if (
    nmsTime._stopTime != undefined &&
    nmsTime._now.getTime() >= nmsTime._stopTime.getTime()
  ) {
    nmsTime.stopPlayback();
    nmsTime._stopTime = undefined;
  }
  nmsTime._now.setMinutes(nmsTime._now.getMinutes() + amount);
  nmsTime._updateData();
};

/*
 * Step based on key-press. Same as step() but stops playback if it's
 * active and allows you to rewind from a "live" map.
 */
nmsTime.stepKey = function (amount) {
  nmsTime.stopPlayback();
  if (nmsTime._now == undefined) {
    nmsTime.setNow(Date.now());
  }
  nmsTime.step(amount);
};

/*
 * Target of setInterval() when replaying.
 */
nmsTime._tick = function () {
  nmsTime.step(nmsTime._speed);
};

/*
 * We now have a time (presumably), start playback.
 *
 * Aborts if the time provided is greater than real time.
 *
 * Gondul does not _yet_ support fast forwarding into the future.
 */
nmsTime.startPlayback = function (speed) {
  if (nmsTime._handle) nmsTime.stopPlayback();
  if (nmsTime._now.getTime() > Date.now()) {
    nmsTime.stopPlayback();
    return;
  }
  nmsTime._speed = speed;
  nmsTime._handle = setInterval(nmsTime._tick, 2000);
};

nmsTime.togglePause = function () {
  if (nmsTime._handle) {
    nmsTime.stopPlayback();
  } else {
    if (nmsTime.isRealTime()) {
      nmsTime.setNow(Date.now());
    } else {
      nmsTime.startPlayback(nmsTime._speed ? nmsTime._speed : 60);
    }
  }
};

nmsTime.stopPlayback = function () {
  if (nmsTime._handle) clearInterval(nmsTime._handle);
  nmsTime._handle = undefined;
};