webhandle-calendar/data/month-grid.js

Calendar tools for node webhandle

const Event = require('./event')
const eventStartCompare = require('../utils/event-start-compare')

const monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']
const monthNamesShort = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]

const dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']
const dayNamesAbr = ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"]
const shortDayNames = ['Su', 'Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa']


class MonthGrid {
	
	constructor(options) {
		options = options || {}
		this.events = []
		this.monthNum = options.monthNum || 0
		this.year = options.year || 2018
		this.dayNames = dayNames
		this.shortDayNames = shortDayNames
		this.monthNames = monthNames
		this.monthNamesShort = monthNamesShort
		this.dayNamesAbr = dayNamesAbr
	}
	
	addEvent(event) {
		if(event instanceof Event == false) {
			event = new Event(event)
		}
		this.events.push(event)
		this.events.sort(eventStartCompare)
	}
	
	getMonthName() {
		return monthNames[this.monthNum]
	}
	
	getNextMonthName() {
		return monthNames[this.monthNum + 1 > 11 ? 0 : this.monthNum + 1]
	}
	
	getPreviousMonthName() {
		return monthNames[this.monthNum - 1 < 0 ? 11 : this.monthNum - 1]
	}

	getNextMonthStartDay() {
		let mon = this.monthNum + 2
		let y = this.year
		if(mon > 12) {
			mon = 1
			y++
		}
		return '' + y + '-' + mon + '-01'
	}
	
	getPreviousMonthStartDay() {
		let mon = this.monthNum 
		let y = this.year
		if(mon < 1) {
			mon = 12
			y--
		}
		return '' + y + '-' + mon + '-01'
	}
	

	createBoxes() {
		let dayCount = new Date(this.year, this.monthNum + 1, 0).getDate()
		let curMonth = []
		let today = new Date()
		for(let i = 1; i <= dayCount; i++) {
			curMonth.push({
				date: i,
				month: this.monthNum,
				year: this.year,
				dateString: `${this.year}-${this.monthNum + 1}-${i}`,
				events: [],
				markers: i < today.getDate() ? 'occurred' : 'forthcoming'
			})
		}
		
		let gridDays = []
		let lastMonthMaxDate = new Date(this.year, this.monthNum, 0).getDate()
		for(let i = new Date(this.year, this.monthNum, 1).getDay(); i > 0; i--) {
			gridDays.unshift({
				date: lastMonthMaxDate--,
				events: [],
				markers: 'non-cur-month'
			})
		}
		
		this.events.forEach(event => {
			let eventMonth = event.start.getMonth()
			event.month = eventMonth
			if(eventMonth == this.monthNum) {
				curMonth[event.start.getDate() - 1].events.push(event)
			}
		})
		
		gridDays.push(...curMonth)
		
		let nextMonthDate = 1
		for(let i = 6 - new Date(this.year, this.monthNum + 1, 0).getDay(); i > 0; i--) {
			gridDays.push({
				date: nextMonthDate++,
				events: [],
				markers: 'non-cur-month'
			})
		}
		
		gridDays.forEach(day => {
			if(day.events.length > 0) {
				day.markers += ' has-events'
			}
			else {
				day.markers += ' no-events'
			}
		})
		
		return gridDays
	}
	
}

module.exports = MonthGrid