import { DAY, HOUR, MINUTE, SECOND } from './utils';

function toDouble(value: number): string {
    return ('0' + value).substr(-2);
}

export class TimeLeft {
    public static fromString(value: string): TimeLeft {
        if (!value || value.length === 0) {
            throw new Error('str is empty');
        }
        const [s, m = 0, h = 0, d = 0] = value
            .split(':')
            .reverse()
            .map((i) => parseInt(i, 10));
        return new TimeLeft(d * DAY + h * HOUR + m * MINUTE + s * SECOND);
    }

    constructor(private timestamp: number) {}

    public getSeconds(): number {
        return Math.floor((this.timestamp % MINUTE) / SECOND);
    }

    public getMinutes(): number {
        return Math.floor((this.timestamp % HOUR) / MINUTE);
    }

    public getHours(): number {
        return Math.floor((this.timestamp % DAY) / HOUR);
    }

    public getDays(): number {
        return Math.floor(this.timestamp / DAY);
    }

    public toTimestamp(): number {
        return this.timestamp;
    }

    public toString(): string {
        return [this.getDays(), this.getHours(), this.getMinutes(), this.getSeconds()].map(toDouble).join(':');
    }
}