Codility Toptal exercise 3

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');
function isLeapYear(year) {
	return year % 4 === 0
}

const months = [
	'January',
	'February',
	'March',
	'April',
	'May',
	'June',
	'July',
	'August',
	'September',
	'October',
	'November',
	'December',
]

const monthDays = [
	31,
	28,
	31,
	30,
	31,
	30,
	31,
	31,
	30,
	31,
	30,
	31,
]

const weekdays = [
	'Monday',
	'Tuesday',
	'Wednesday',
	'Thursday',
	'Friday',
	'Saturday',
	'Sunday'
]

function getWeekDayFirstOfMonth(monthIndex, firstWeekDayOfTheYear, year) {
	let monthFound = false;
	// let dayOfTheWeekIndex = 
	let accumDays = weekdays.indexOf(firstWeekDayOfTheYear)
	
	for(i = 0; !monthFound && i < months.length; i++) {
		monthFound = i === monthIndex
		if(!monthFound) {
			accumDays += monthDays[i]
		}
	}
	//TODO isLeapYear
	if(isLeapYear(year) && monthIndex > 1) {
		accumDays++
	}
	
	return weekdays[accumDays % 7]
}



function solution(year, startingMonth, endMonth, firstWeekDayOfTheYear) {
    // write your code in JavaScript (Node.js 8.9.4)
	let daysOfVacations = 0;
	const startingMonthIndex = months.indexOf(startingMonth)
	const endMonthIndex = months.indexOf(endMonth)
	const firstDayOfVacationsMonth = getWeekDayFirstOfMonth(startingMonthIndex, firstWeekDayOfTheYear, year)
	const firstDayOfWorkMonth = getWeekDayFirstOfMonth(endMonthIndex + 1, firstWeekDayOfTheYear)

	console.log(firstDayOfVacationsMonth)
	console.log(firstDayOfWorkMonth)

	for(let i = startingMonthIndex; i <= endMonthIndex; i++) {
		daysOfVacations += monthDays[i]
	}

	if(firstDayOfVacationsMonth !== 'Monday') {
		daysOfVacations -= 7 - weekdays.indexOf(firstDayOfVacationsMonth) + 1
	}

	if(firstDayOfWorkMonth !== 'Monday') {
		daysOfVacations -= 7 - (7 - weekdays.indexOf(firstDayOfWorkMonth) + 1)
	}

	return daysOfVacations / 7
}


let year = 2014
let startingMonth = 'April'
let endMonth = 'May'
let firstWeekDayOfTheYear = 'Wednesday'

console.log(solution(year, startingMonth, endMonth, firstWeekDayOfTheYear)) //7

year = 2027
startingMonth = 'April'
endMonth = 'May'
firstWeekDayOfTheYear = 'Friday'

console.log(solution(year, startingMonth, endMonth, firstWeekDayOfTheYear)) //7