import { DateTime, Duration } from 'luxon';

export class Format {

    public static spaceCamelCase(str: string): string {
        return str.replace(RegExp('/([A-Z])/g'), ' $1').trim();
    };

    public static sortAlphabetic(a: string, b: string) {
        if (a > b) { return 1; }
        if (a < b) { return -1; }
        return 0;
    };

    public static secondsToHMS(seconds: number) : string {
        // calculate Hours and Minutes
        let minutes = Math.floor(seconds / 60);
        let hours = Math.floor(minutes / 60);
        minutes = minutes % 60;
        seconds = seconds % 60;
    
        // Format for display
        let hourText = hours + ' hour' + (hours == 1 ? '' : 's') ;
        return `${hours > 0 ? hourText : ''} ${minutes} minute${minutes == 1 ? '' : 's'} ${seconds} second${seconds == 1 ? '' : 's'}`;
    }

    public static secondsToErlangs(seconds: number) : string {
        let erlangs = seconds / 3600;
        return erlangs.toFixed(2);
    }

    public static displayBandwidth(value: number): string {
        let units = ['kbps', 'mbps', 'gbps'];
        let index = 0;
        while(value > 1000 && index < units.length) {
            value /= 1000;
            index ++;
        }
        let displayValue = value.toString();
    
        if(value - Math.floor(value) > 0) {
            displayValue = value.toFixed(1);
        }
    
        return `${displayValue} ${units[index]}`;
    }

    public static displayDateRanges(dates: string[], interval = 1, intervalUnits = 'hours'): string {
        const recentDate = DateTime.fromISO(dates.pop())
        const duration = Duration.fromObject({ [intervalUnits]: interval });
        return `${recentDate.toFormat('MMM D h:mma')} - ${recentDate.plus(duration).toFormat('h:mma')}`;
    }

    public static displayDate(dateString: string): string {
        let date = DateTime.fromISO(dateString);
        return date.toFormat("MMM D h:mma");
    }
}