// (C) 2007-2019 GoodData Corporation
import { datesBetween } from "../datesBetween/datesBetween";

export class DateRange {
    public static DEFAULT_FROM: string = "01-01-2015";

    public static fromDates(from: Date, to: Date) {
        const date = new DateRange();

        date.from = from;
        date.to = to;

        return date;
    }

    private from: Date;
    private to: Date;

    constructor(from?: string, to?: string) {
        this.from = new Date(from ? from : DateRange.DEFAULT_FROM);

        this.to = to ? new Date(to) : new Date();
    }

    public getFromDate(): Date {
        return this.from;
    }

    public getToDate(): Date {
        return this.to;
    }

    public getDatesBetween(): IterableIterator<Date> {
        return datesBetween(this.getFromDate(), this.getToDate());
    }

    public intersect(other: DateRange): DateRange {
        // Maximum of left boundaries
        const fromDate = new Date(Math.max(other.getFromDate().getTime(), this.getFromDate().getTime()));

        // Minimum of right boundaries
        const toDate = new Date(Math.min(other.getToDate().getTime(), this.getToDate().getTime()));

        return DateRange.fromDates(fromDate, toDate);
    }
}