import isBetween from "dayjs/plugin/isBetween";
import isSameOrAfter from "dayjs/plugin/isSameOrAfter";
import isSameOrBefore from "dayjs/plugin/isSameOrBefore";
import localeData from "dayjs/plugin/localeData";
import localizedFormat from "dayjs/plugin/localizedFormat";
import minMax from "dayjs/plugin/minMax";
import utc from "dayjs/plugin/utc";
import { DateLocalizer } from "react-big-calendar";

function arrayWithHoles(arr) {
  if (Array.isArray(arr)) return arr;
}

function iterableToArrayLimit(arr, i) {
  if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return;
  var _arr = [];
  var _n = true;
  var _d = false;
  var _e = undefined;
  try {
    for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) {
      _arr.push(_s.value);
      if (i && _arr.length === i) break;
    }
  } catch (err) {
    _d = true;
    _e = err;
  } finally {
    try {
      if (!_n && _i["return"] != null) _i["return"]();
    } finally {
      if (_d) throw _e;
    }
  }
  return _arr;
}

function unsupportedIterableToArray(o, minLen) {
  if (!o) return;
  if (typeof o === "string") return arrayLikeToArray(o, minLen);
  var n = Object.prototype.toString.call(o).slice(8, -1);
  if (n === "Object" && o.constructor) n = o.constructor.name;
  if (n === "Map" || n === "Set") return Array.from(o);
  if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return arrayLikeToArray(o, minLen);
}

function arrayLikeToArray(arr, len) {
  if (len == null || len > arr.length) len = arr.length;
  for (var i = 0, arr2 = new Array(len); i < len; i++) {
    arr2[i] = arr[i];
  }
  return arr2;
}

function nonIterableRest() {
  throw new TypeError(
    "Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."
  );
}

function _slicedToArray(arr, i) {
  return arrayWithHoles(arr) || iterableToArrayLimit(arr, i) || unsupportedIterableToArray(arr, i) || nonIterableRest();
}

function fixUnit(unit) {
  var datePart = unit ? unit.toLowerCase() : unit;
  if (datePart === "FullYear") {
    datePart = "year";
  } else if (!datePart) {
    datePart = undefined;
  }
  return datePart;
}

var timeRangeFormat = function timeRangeFormat(_ref3, culture, local) {
  var start = _ref3.start,
    end = _ref3.end;
  return local.format(start, "LT", culture) + " – " + local.format(end, "LT", culture);
};
var timeRangeStartFormat = function timeRangeStartFormat(_ref4, culture, local) {
  var start = _ref4.start;
  return local.format(start, "LT", culture) + " – ";
};
var timeRangeEndFormat = function timeRangeEndFormat(_ref5, culture, local) {
  var end = _ref5.end;
  return " – " + local.format(end, "LT", culture);
};
var weekRangeFormat = function weekRangeFormat(_ref, culture, local) {
  var start = _ref.start,
    end = _ref.end;
  return (
    local.format(start, "MMMM DD", culture) +
    " – " +
    // updated to use this localizer 'eq()' method
    local.format(end, local.eq(start, end, "month") ? "DD" : "MMMM DD", culture)
  );
};
var dateRangeFormat = function dateRangeFormat(_ref2, culture, local) {
  var start = _ref2.start,
    end = _ref2.end;
  return local.format(start, "L", culture) + " – " + local.format(end, "L", culture);
};

var formats = {
  dateFormat: "DD",
  dayFormat: "DD ddd",
  weekdayFormat: "ddd",
  selectRangeFormat: timeRangeFormat,
  eventTimeRangeFormat: timeRangeFormat,
  eventTimeRangeStartFormat: timeRangeStartFormat,
  eventTimeRangeEndFormat: timeRangeEndFormat,
  timeGutterFormat: "LT",
  monthHeaderFormat: "MMMM YYYY",
  dayHeaderFormat: "dddd MMM DD",
  dayRangeHeaderFormat: weekRangeFormat,
  agendaHeaderFormat: dateRangeFormat,
  agendaDateFormat: "ddd MMM DD",
  agendaTimeFormat: "LT",
  agendaTimeRangeFormat: timeRangeFormat
};

const localizer = (dayjsLib) => {
  var locale = function locale(dj, c) {
    return c ? dj.locale(c) : dj;
  };

  // if the timezone plugin is loaded,
  // then use the timezone aware version

  //TODO This was the issue entirely...
  // var dayjs = dayjsLib.tz ? dayjsLib.tz : dayjsLib;

  var dayjs = dayjsLib;

  function getTimezoneOffset(date) {
    // ensures this gets cast to timezone
    return dayjs(date).toDate().getTimezoneOffset();
  }

  function getDstOffset(start, end) {
    var _st$tz$$x$$timezone;
    // convert to dayjs, in case
    var st = dayjs(start);
    var ed = dayjs(end);
    // if not using the dayjs timezone plugin
    if (!dayjs.tz) {
      return st.toDate().getTimezoneOffset() - ed.toDate().getTimezoneOffset();
    }
    /**
     * If a default timezone has been applied, then
     * use this to get the proper timezone offset, otherwise default
     * the timezone to the browser local
     */
    var tzName =
      (_st$tz$$x$$timezone = st.tz().$x.$timezone) !== null && _st$tz$$x$$timezone !== void 0
        ? _st$tz$$x$$timezone
        : dayjsLib.tz.guess();
    // invert offsets to be inline with moment.js
    var startOffset = -dayjs.tz(+st, tzName).utcOffset();
    var endOffset = -dayjs.tz(+ed, tzName).utcOffset();
    return startOffset - endOffset;
  }

  function getDayStartDstOffset(start) {
    var dayStart = dayjs(start).startOf("day");
    return getDstOffset(dayStart, start);
  }

  /*** BEGIN localized date arithmetic methods with dayjs ***/
  function defineComparators(a, b, unit) {
    var datePart = fixUnit(unit);
    var dtA = datePart ? dayjs(a).startOf(datePart) : dayjs(a);
    var dtB = datePart ? dayjs(b).startOf(datePart) : dayjs(b);
    return [dtA, dtB, datePart];
  }

  function startOf() {
    var date = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
    var unit = arguments.length > 1 ? arguments[1] : undefined;
    var datePart = fixUnit(unit);
    if (datePart) {
      return dayjs(date).startOf(datePart).toDate();
    }
    return dayjs(date).toDate();
  }

  function endOf() {
    var date = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : null;
    var unit = arguments.length > 1 ? arguments[1] : undefined;
    var datePart = fixUnit(unit);
    if (datePart) {
      return dayjs(date).endOf(datePart).toDate();
    }
    return dayjs(date).toDate();
  }

  // dayjs comparison operations *always* convert both sides to dayjs objects
  // prior to running the comparisons
  function eq(a, b, unit) {
    var _defineComparators = defineComparators(a, b, unit),
      _defineComparators2 = _slicedToArray(_defineComparators, 3),
      dtA = _defineComparators2[0],
      dtB = _defineComparators2[1],
      datePart = _defineComparators2[2];
    return dtA.isSame(dtB, datePart);
  }

  function neq(a, b, unit) {
    return !eq(a, b, unit);
  }

  function gt(a, b, unit) {
    var _defineComparators3 = defineComparators(a, b, unit),
      _defineComparators4 = _slicedToArray(_defineComparators3, 3),
      dtA = _defineComparators4[0],
      dtB = _defineComparators4[1],
      datePart = _defineComparators4[2];
    return dtA.isAfter(dtB, datePart);
  }

  function lt(a, b, unit) {
    var _defineComparators5 = defineComparators(a, b, unit),
      _defineComparators6 = _slicedToArray(_defineComparators5, 3),
      dtA = _defineComparators6[0],
      dtB = _defineComparators6[1],
      datePart = _defineComparators6[2];
    return dtA.isBefore(dtB, datePart);
  }

  function gte(a, b, unit) {
    var _defineComparators7 = defineComparators(a, b, unit),
      _defineComparators8 = _slicedToArray(_defineComparators7, 3),
      dtA = _defineComparators8[0],
      dtB = _defineComparators8[1],
      datePart = _defineComparators8[2];
    return dtA.isSameOrBefore(dtB, datePart);
  }

  function lte(a, b, unit) {
    var _defineComparators9 = defineComparators(a, b, unit),
      _defineComparators10 = _slicedToArray(_defineComparators9, 3),
      dtA = _defineComparators10[0],
      dtB = _defineComparators10[1],
      datePart = _defineComparators10[2];
    return dtA.isSameOrBefore(dtB, datePart);
  }

  function inRange(day, min, max) {
    var unit = arguments.length > 3 && arguments[3] !== undefined ? arguments[3] : "day";
    var datePart = fixUnit(unit);
    var djDay = dayjs(day);
    var djMin = dayjs(min);
    var djMax = dayjs(max);
    return djDay.isBetween(djMin, djMax, datePart, "[]");
  }

  function min(dateA, dateB) {
    var dtA = dayjs(dateA);
    var dtB = dayjs(dateB);
    var minDt = dayjsLib.min(dtA, dtB);
    return minDt.toDate();
  }

  function max(dateA, dateB) {
    var dtA = dayjs(dateA);
    var dtB = dayjs(dateB);
    var maxDt = dayjsLib.max(dtA, dtB);
    return maxDt.toDate();
  }

  function merge(date, time) {
    if (!date && !time) return null;
    var tm = dayjs(time).format("HH:mm:ss");
    var dt = dayjs(date).startOf("day").format("MM/DD/YYYY");
    // We do it this way to avoid issues when timezone switching
    return dayjsLib("".concat(dt, " ").concat(tm), "MM/DD/YYYY HH:mm:ss").toDate();
  }

  function add(date, adder, unit) {
    var datePart = fixUnit(unit);
    return dayjs(date).add(adder, datePart).toDate();
  }

  function range(start, end) {
    var unit = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : "day";
    var datePart = fixUnit(unit);
    // because the add method will put these in tz, we have to start that way
    var current = dayjs(start).toDate();
    var days = [];
    while (lte(current, end)) {
      days.push(current);
      current = add(current, 1, datePart);
    }
    return days;
  }

  function ceil(date, unit) {
    var datePart = fixUnit(unit);
    var floor = startOf(date, datePart);
    return eq(floor, date) ? floor : add(floor, 1, datePart);
  }

  function diff(a, b) {
    var unit = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : "day";
    var datePart = fixUnit(unit);
    // don't use 'defineComparators' here, as we don't want to mutate the values
    var dtA = dayjs(a);
    var dtB = dayjs(b);
    return dtB.diff(dtA, datePart);
  }

  function minutes(date) {
    var dt = dayjs(date);
    return dt.minutes();
  }

  function firstOfWeek(culture) {
    var data = culture ? dayjsLib.localeData(culture) : dayjsLib.localeData();
    return data ? data.firstDayOfWeek() : 0;
  }

  function firstVisibleDay(date) {
    return dayjs(date).startOf("month").startOf("week").toDate();
  }

  function lastVisibleDay(date) {
    return dayjs(date).endOf("month").endOf("week").toDate();
  }

  function visibleDays(date) {
    var current = firstVisibleDay(date);
    var last = lastVisibleDay(date);
    var days = [];
    while (lte(current, last)) {
      days.push(current);
      current = add(current, 1, "d");
    }
    return days;
  }

  /*** END localized date arithmetic methods with dayjs ***/

  /**
   * Moved from TimeSlots.js, this method overrides the method of the same name
   * in the localizer.js, using dayjs to construct the js Date
   * @param {Date} dt - date to start with
   * @param {Number} minutesFromMidnight
   * @param {Number} offset
   * @returns {Date}
   */
  function getSlotDate(dt, minutesFromMidnight, offset) {
    return dayjs(dt)
      .startOf("day")
      .minute(minutesFromMidnight + offset)
      .toDate();
  }

  // dayjs will automatically handle DST differences in it's calculations
  function getTotalMin(start, end) {
    return diff(start, end, "minutes");
  }

  function getMinutesFromMidnight(start) {
    var dayStart = dayjs(start).startOf("day");
    var day = dayjs(start);
    return day.diff(dayStart, "minutes") + getDayStartDstOffset(start);
  }

  // These two are used by DateSlotMetrics
  function continuesPrior(start, first) {
    var djStart = dayjs(start);
    var djFirst = dayjs(first);
    return djStart.isBefore(djFirst, "day");
  }

  function continuesAfter(start, end, last) {
    var djEnd = dayjs(end);
    var djLast = dayjs(last);
    return djEnd.isSameOrAfter(djLast, "minutes");
  }

  function daySpan(start, end) {
    var startDay = dayjs(start);
    var endDay = dayjs(end);
    return endDay.diff(startDay, "day");
  }

  // These two are used by eventLevels
  function sortEvents(_ref6) {
    var _ref6$evtA = _ref6.evtA,
      aStart = _ref6$evtA.start,
      aEnd = _ref6$evtA.end,
      aAllDay = _ref6$evtA.allDay,
      _ref6$evtB = _ref6.evtB,
      bStart = _ref6$evtB.start,
      bEnd = _ref6$evtB.end,
      bAllDay = _ref6$evtB.allDay;
    var startSort = +startOf(aStart, "day") - +startOf(bStart, "day");
    var durA = daySpan(aStart, aEnd);
    var durB = daySpan(bStart, bEnd);
    return (
      startSort ||
      // sort by start Day first
      durB - durA ||
      // events spanning multiple days go first
      !!bAllDay - !!aAllDay ||
      // then allDay single day events
      +aStart - +bStart ||
      // then sort by start time *don't need dayjs conversion here
      +aEnd - +bEnd // then sort by end time *don't need dayjs conversion here either
    );
  }

  function inEventRange(_ref7) {
    var _ref7$event = _ref7.event,
      start = _ref7$event.start,
      end = _ref7$event.end,
      _ref7$range = _ref7.range,
      rangeStart = _ref7$range.start,
      rangeEnd = _ref7$range.end;
    var startOfDay = dayjs(start).startOf("day");
    var eEnd = dayjs(end);
    var rStart = dayjs(rangeStart);
    var rEnd = dayjs(rangeEnd);
    var startsBeforeEnd = startOfDay.isSameOrBefore(rEnd, "day");
    // when the event is zero duration we need to handle a bit differently
    var sameMin = !startOfDay.isSame(eEnd, "minutes");
    var endsAfterStart = sameMin ? eEnd.isAfter(rStart, "minutes") : eEnd.isSameOrAfter(rStart, "minutes");
    return startsBeforeEnd && endsAfterStart;
  }

  function isSameDate(date1, date2) {
    var dt = dayjs(date1);
    var dt2 = dayjs(date2);
    return dt.isSame(dt2, "day");
  }

  /**
   * This method, called once in the localizer constructor, is used by eventLevels
   * 'eventSegments()' to assist in determining the 'span' of the event in the display,
   * specifically when using a timezone that is greater than the browser native timezone.
   * @returns number
   */
  function browserTZOffset() {
    /**
     * Date.prototype.getTimezoneOffset horrifically flips the positive/negative from
     * what you see in it's string, so we have to jump through some hoops to get a value
     * we can actually compare.
     */
    var dt = new Date();
    var neg = /-/.test(dt.toString()) ? "-" : "";
    var dtOffset = dt.getTimezoneOffset();
    var comparator = Number("".concat(neg).concat(Math.abs(dtOffset)));
    // dayjs correctly provides positive/negative offset, as expected
    var mtOffset = dayjs().utcOffset();
    return mtOffset > comparator ? 1 : 0;
  }

  return new DateLocalizer({
    formats: formats,
    firstOfWeek: firstOfWeek,
    firstVisibleDay: firstVisibleDay,
    lastVisibleDay: lastVisibleDay,
    visibleDays: visibleDays,
    format: function format(value, _format, culture) {
      return locale(dayjs(value), culture).format(_format);
    },
    lt: lt,
    lte: lte,
    gt: gt,
    gte: gte,
    eq: eq,
    neq: neq,
    merge: merge,
    inRange: inRange,
    startOf: startOf,
    endOf: endOf,
    range: range,
    add: add,
    diff: diff,
    ceil: ceil,
    min: min,
    max: max,
    minutes: minutes,
    getSlotDate: getSlotDate,
    getTimezoneOffset: getTimezoneOffset,
    getDstOffset: getDstOffset,
    getTotalMin: getTotalMin,
    getMinutesFromMidnight: getMinutesFromMidnight,
    continuesPrior: continuesPrior,
    continuesAfter: continuesAfter,
    sortEvents: sortEvents,
    inEventRange: inEventRange,
    isSameDate: isSameDate,
    browserTZOffset: browserTZOffset
  });
};
export default localizer;