Event schedule utility function

event-schedule-utility-function.markdown

Event schedule utility function

This was forked from Brian Holt

A Pen by piggyslasher on CodePen.

License.

script.babel

/*
Date Calculation
An event takes place twice weekly on a Wednesday and a Saturday at 8pm. Write a function that calculates and returns the next valid draw date based on the current date and time and also on an optional supplied date.
Originally a PHP exercise.
*/

// https://hackernoon.com/a-quick-handbook-for-dates-in-javascript-7b71d0ef8e53

const getIndexedObj = arr => arr.reduce(
  (acc, c, idx) => ({ ...acc, ...({ [c.toLowerCase()]: idx }) })
, {})

const namesOfDays = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday']
const days = getIndexedObj(namesOfDays)

const repeat = {
  yearly: 'Year', // @TODO - research on being dynamic
  monthly: 'Month', // @TODO - research on being dynamic
  weekly: 7,
  daily: 'Date', 
}

const d = s => s
  ? new Date(s)
  : new Date()  // Convert date string to date -- empty string is current date

// console.log(days)

const schedule = [
  {
    startDateTime: d('3 Oct 2018 20:00'), // wednesday
    occurs: [days.wednesday, days.saturday],
    repeatType: repeat.daily,
    endDate: d('31 Oct 2018 20:00'),
  }
]

const getNextDateByDay = (day, initDate = d()) => {
  console.log('bef:' + initDate + '')
  initDate.setUTCDate(initDate.getUTCDate() + (7 - initDate.getUTCDay()) % 7 + day + 1)
  console.log(initDate + '')
  return initDate;
}

console.log('start')
function getRecurringDates(
  startDate,
  endDate,
  interval,
  intervalType,
  occurs,
  noweekends = false
  ) {
    // console.log(arguments)
    intervalType = intervalType || 'Date';
    var date = startDate;
    var recurrent = [];
    var setget = {set: 'set'+intervalType, get: 'get'+intervalType};

    while (date < endDate) {
        recurrent.push( occurs ? isMatch(occurs, date) : new Date(date) );
        date[setget.set](date[setget.get]() + interval);
    }
    
    function isMatch(occurs, d) {
      console.log(d, d.getDay())
      return true
    }
    
    // add 1 day for sunday, subtract one for saturday
    function noWeekend() {
        var currdate = new Date(date), day = date.getDay();
        if (~[6,0].indexOf(day)) {
          currdate.setDate(currdate.getDate() + (day == 6 ? -1 : 1));
        }
        return new Date(currdate);
    }

    return recurrent;
}

console.log(
  'asd',
  getRecurringDates(
    new Date('23 Oct 2018'),
    new Date('25 Oct 2018'),
    1,
    null,
    [days.monday]
  ).map(d => namesOfDays[d.getDate()])
)

const getNextEventDate = (event, dateFrom = Date.now()) => {
  
  /*console.log(
    event.occurs.sort().find(
      (i) => {
        console.log(i)
        return true
      }
    )
  );
  return dd.setUTCDate(dd.getUTCDate() + (7 - dd.getUTCDay()) % 7 + 1);*/
}

// console.log(getNextEventDate(schedule[0]))

// Assertion below
describe('get next scheduled event', function() {
  it('should generate the days arrays', () => {
    // expect(addr(1 ,2)).toEqual(3);
    
    expect(days.monday).toEqual(0)
    expect(days.friday).toEqual(namesOfDays.indexOf('Friday'))

    namesOfDays.forEach(
      (dayName, index) => expect(days[dayName.toLowerCase()]).toEqual(index)
    )
    // Uncomment below to see Failing test
    // expect(addr(-1 ,-2)).toEqual(-4);
  })
  
  it('should return next event day', () => {
    // expect(getNextEventDate(schedule[0], Date.now())).toEqual()
  })
  
  it('should return next event date', () => {
    // expect(getNextEventDate(schedule[0], Date.now())).toEqual()
  })
  
  it('shoudl return the date of the next occuring day (i.e. monday, tuesday)', () => {
    // expect(getNextDateByDay(days.tuesday, new Date('1 Oct 2018 16:00'))).toEqual(10)
  })
  
});

scripts

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<script src="https://cdnjs.cloudflare.com/ajax/libs/jasmine/2.3.4/boot.js"></script>

styles

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