/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { DateRange } from '@blueprintjs/datetime';

const CURRENT_YEAR = new Date().getUTCFullYear();

export function dateToIsoDateString(date: Date): string {
  return date.toISOString().substr(0, 10);
}

export function utcToLocalDate(utcDate: Date): Date {
  // Function removes the local timezone of the date and displays it in UTC
  return new Date(utcDate.getTime() + utcDate.getTimezoneOffset() * 60000);
}

export function localToUtcDate(localDate: Date): Date {
  // Function removes the local timezone of the date and displays it in UTC
  return new Date(localDate.getTime() - localDate.getTimezoneOffset() * 60000);
}

export function intervalToLocalDateRange(interval: string): DateRange {
  const dates = interval.split('/');
  if (dates.length !== 2) return [null, null];

  const startDate = Date.parse(dates[0]) ? new Date(dates[0]) : null;
  const endDate = Date.parse(dates[1]) ? new Date(dates[1]) : null;

  // Must check if the start and end dates are within range
  return [
    startDate && startDate.getFullYear() < CURRENT_YEAR - 20 ? null : startDate,
    endDate && endDate.getFullYear() > CURRENT_YEAR ? null : endDate,
  ];
}

export function localDateRangeToInterval(localRange: DateRange): string {
  // This function takes in the dates selected from datepicker in local time, and displays them in UTC
  // Shall Blueprint make any changes to the way dates are selected, this function will have to be reworked
  const [localStartDate, localEndDate] = localRange;
  return `${localStartDate ? localToUtcDate(localStartDate).toISOString().substring(0, 19) : ''}/${
    localEndDate ? localToUtcDate(localEndDate).toISOString().substring(0, 19) : ''
  }`;
}

export function ceilToUtcDay(date: Date): Date {
  date = new Date(date.valueOf());
  date.setUTCHours(0, 0, 0, 0);
  date.setUTCDate(date.getUTCDate() + 1);
  return date;
}