/**
 * 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.
 */

var validator = require('utils/validator');
var App = require('app');

module.exports = {
  dateMonths:['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
  dateDays:['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'],
  dateFormatZeroFirst:function (time) {
    if (time < 10) return '0' + time;
    return time;
  },
  /**
   * Convert timestamp to date-string 'DAY_OF_THE_WEEK, MONTH DAY, YEAR HOURS:MINUTES'
   * @param timestamp
   * @return string date
   */
  dateFormat:function (timestamp) {
    if (!validator.isValidInt(timestamp)) return timestamp;
    var date = new Date(timestamp);
    var months = this.dateMonths;
    var days = this.dateDays;
    return days[date.getDay()] + ', ' + months[date.getMonth()] + ' ' + this.dateFormatZeroFirst(date.getDate()) + ', ' + date.getFullYear() + ' ' + this.dateFormatZeroFirst(date.getHours()) + ':' + this.dateFormatZeroFirst(date.getMinutes());
  },
  /**
   * Convert timestamp to date-string 'DAY_OF_THE_WEEK MONTH DAY YEAR'
   * @param timestamp
   * @return {*}
   */
  dateFormatShort: function(timestamp) {
    if (!validator.isValidInt(timestamp)) return timestamp;

    var date = new Date(timestamp);
    var today = new Date();
    if (date.toDateString() === today.toDateString()) {
      return 'Today ' + date.toLocaleTimeString();
    }
    return date.toDateString();
  },
  /**
   * Convert starTimestamp to 'DAY_OF_THE_WEEK, MONTH DAY, YEAR HOURS:MINUTES', except for the case: year equals 1969
   * @param startTimestamp
   * @return string startTimeSummary
   */
  startTime: function (startTimestamp) {
    if (!validator.isValidInt(startTimestamp)) return '';
    var startDate = new Date(startTimestamp);
    var months = this.dateMonths;
    var days = this.dateDays;
    // generate start time
    if (startDate.getFullYear() == 1969 || startTimestamp < 1) {
      return 'Not started';
    }
    var startTimeSummary = '';
    if (new Date(startTimestamp).setHours(0, 0, 0, 0) == new Date().setHours(0, 0, 0, 0) ) { //today
      startTimeSummary = 'Today ' + this.dateFormatZeroFirst(startDate.getHours()) + ':' + this.dateFormatZeroFirst(startDate.getMinutes());
    } else {
      startTimeSummary =  days[startDate.getDay()] + ' ' + months[startDate.getMonth()] + ' ' + this.dateFormatZeroFirst(startDate.getDate()) + ' ' + startDate.getFullYear() + ' '
        + this.dateFormatZeroFirst(startDate.getHours()) + ':' + this.dateFormatZeroFirst(startDate.getMinutes());
    }
    return startTimeSummary;
  },
  /**
   * Provides the duration between the given start and end timestamp. If start time
   * not valid, duration will be ''. If end time is not valid, duration will
   * be till now, showing 'Lasted for xxx secs'.
   * @param startTimestamp
   * @param endTimestamp
   * @return string durationSummary
   */
  durationSummary: function (startTimestamp, endTimestamp) {
    // generate duration
    var durationSummary = '';
    var startDate = new Date(startTimestamp);
    var endDate = new Date(endTimestamp);
    var self = this;
    if (startDate.getFullYear() == 1969 || startTimestamp < 1) {
      return '';
    }
    if (endDate.getFullYear() != 1969 && endTimestamp > 0) {
      return '' + this.timingFormat(endTimestamp - startTimestamp, 1); //lasted for xx secs
    } else {
      // still running, duration till now
      var time =  (App.dateTime() - startTimestamp) < 0? 0 : (App.dateTime() - startTimestamp) ;
      durationSummary = '' + this.timingFormat( time , 1);
    }
    return durationSummary;
  },

  /**
   * Convert time in mseconds to
   * 30 ms = 30 ms
   * 300 ms = 300 ms
   * 999 ms = 999 ms
   * 1000 ms = 1.00 secs
   * 3000 ms = 3.00 secs
   * 35000 ms = 35.00 secs
   * 350000 ms = 350.00 secs
   * 999999 ms = 999.99 secs
   * 1000000 ms = 16.66 mins
   * 3500000 secs = 58.33 mins
   * @param time
   * @param zeroValid for the case to show 0 when time is 0, not null
   * @return string formatted date
   */
  timingFormat:function (time, /* optional */ zeroValid) {
    var intTime  = parseInt(time);
    if (zeroValid && intTime == 0) return 0 + ' secs';
    if (!intTime) return null;
    var timeStr = intTime.toString();
    var lengthOfNumber = timeStr.length;
    var oneMinMs = 60000;
    var oneHourMs = 3600000;
    var oneDayMs = 86400000;

    if (lengthOfNumber < 4) {
      return time + ' ms';
    } else if (lengthOfNumber < 7) {
      time = (time / 1000).toFixed(2);
      return time + ' secs';
    } else if (time < oneHourMs) {
      time = (time / oneMinMs).toFixed(2);
      return time + ' mins';
    } else if (time < oneDayMs) {
      time = (time / oneHourMs).toFixed(2);
      return time + ' hours';
    } else {
      time = (time / oneDayMs).toFixed(2);
      return time + ' days';
    }
  },
  /**
   * Provides the duration between the given start and end time. If start time
   * is not given, duration will be 0. If end time is not given, duration will
   * be till now.
   *
   * @param {Number} startTime Start time from epoch
   * @param {Number} endTime End time from epoch
   * @return {Number} duration
   */
  duration : function(startTime, endTime) {
    var duration = 0;
    if (startTime && startTime > 0) {
      if (!endTime || endTime < 1) {
        endTime = App.dateTime();
      }
      duration = endTime - startTime;
    }
    return duration;
  }
};