major overhaul of schedule parsing code

server/types/scheduledEventTypes.ts

@@ -1,10 +1,99 @@
+import { add } from "date-fns"
+import { DateResolvable } from "discord.js"
+import { CustomError, errorCodes } from "../interfaces"
 
 export interface RepetitonInfo {
 	startDate?: Date, // If defined will take precedence over repetitonAmount
 	endDate?: Date,// If defined will take precedence over repetitonAmount
 	totalAmount: number,
 	alreadyOccured: number,
-	schedule: supportedSchedule
+	schedule: Schedule
 }
-export const scheduleNames = ['daily', 'weekly', 'monthly', 'everyTwoWeeks', 'everyNDays']
+export const scheduleNames = ['daily', 'weekly', 'monthly', 'everyNWeeks', 'everyNDays', 'everyNMonths']
 export type supportedSchedule = typeof scheduleNames[number]
+export interface IScheduleType {
+	name: supportedSchedule,
+	multiplier: number,
+	duration: Duration
+}
+export const scheduleTypes: IScheduleType[] = [
+	{
+		name: 'daily',
+		multiplier: 1,
+		duration: {
+			days: 1
+		}
+	},
+	{
+		name: 'weekly',
+		multiplier: 1,
+		duration: {
+			weeks: 1
+		}
+	},
+]
+export class Schedule {
+	private scheduleName: string
+	private multiplier = 1
+	private duration: Duration
+	private baseScheduleTypes = ['daily', 'weekly', 'monthly', 'yearly']
+	private _scheduleString: string
+	constructor(scheduleString: string) {
+		this._scheduleString = scheduleString.toLowerCase()
+		this.scheduleName = this._scheduleString
+		if (this.baseScheduleTypes.includes(this._scheduleString)) {
+			this.multiplier = 1
+		}
+		if (this._scheduleString.includes('every')) {
+			this.scheduleName = this.getBaseScheduleNameFromVariableString()
+			this.multiplier = this.getMultiplierFromVariableString()
+		}
+
+		switch (this.scheduleName) {
+			case 'daily':
+				this.duration = { days: 1 }
+				break
+			case 'weekly':
+				this.duration = { weeks: 1 }
+				break
+			case 'monthly':
+				this.duration = { months: 1 }
+				break
+			case 'yearly':
+				this.duration = { years: 1 }
+				break
+			default:
+				throw new CustomError('Schedule type not supported', errorCodes.schedule_not_supported)
+		}
+	}
+	private getBaseScheduleNameFromVariableString(): string {
+		if (this._scheduleString.includes('week')) return 'weekly'
+		if (this._scheduleString.includes('day')) return 'daily'
+		if (this._scheduleString.includes('month')) return 'monthly'
+		if (this._scheduleString.includes('year')) return 'yearly'
+		return ''
+	}
+	public getMultiplierFromVariableString(): number {
+		const matches = this._scheduleString.match(/\d+/)
+		if (matches) {
+			const multi = matches[0]
+			if (multi)
+				return parseInt(multi)
+		}
+		return 1
+	}
+	public calculateDuration(): Duration {
+		const dur: Duration = {
+			days: this.duration.days ? this.duration.days * this.multiplier : undefined,
+			weeks: this.duration.weeks ? this.duration.weeks * this.multiplier : undefined,
+			months: this.duration.months ? this.duration.months * this.multiplier : undefined,
+			years: this.duration.years ? this.duration.years * this.multiplier : undefined,
+		}
+		return dur
+	}
+
+	public getNewDate(oldDate: Date): Date {
+		const newDate = add(oldDate, this.calculateDuration())
+		return newDate
+	}
+}