interface Number {
    pad(n: number, char?: string): string,
    durationify(): string
}

Number.prototype.pad = function(n, char = "0") {
    return (new Array(n).join(char) + this).slice(-n)
}

Number.prototype.durationify = function () {
    if (! this) {
        return '0s'
    }
    const base = Number(this)
    const days = Math.floor(base / 60 / 60 / 24)
    const hours = Math.floor((base - (days * 60 * 60 * 24)) / 60 / 60)
    const minutes = Math.floor((base - (days * 60 * 60 * 24) - (hours * 60 *60)) / 60)
    const secondes = Math.floor(base - (days * 60 * 60 * 24) - (hours * 60 *60) - (minutes *60))

    let duration = ''
    duration += (days) ? `${days}j ` : ''
    duration += (days > 0 || hours > 0) ? `${hours}h ` : ''
    duration += (days > 0 || hours > 0 || minutes > 0) ? `${minutes}m ` : ''
    duration += `${secondes}s`
    return duration
}

interface Date {
    toFrDate(): string,
    toFrTime(): string,
    toSmallFrDate(): string,
    difference(start_at?: Date): string,
}

Date.prototype.toFrDate = function() {
    return `${this.getDate()}/${Number(this.getMonth() + 1).pad(2)}/${this.getFullYear()}`
}

Date.prototype.toFrTime = function(separator = 'h') {
    return `${this.getHours().pad(2, '0')}${separator}${Number(this.getMinutes()).pad(2)}`
}

Date.prototype.toSmallFrDate = function() {
    if ((new Date(this)).toFrDate() === (new Date()).toFrDate()) {
        return `${this.toFrTime()}`
    }

    if ((new Date(this)).getFullYear() === (new Date()).getFullYear()) {
        return `${this.getDate()}/${Number(this.getMonth() + 1).pad(2)} ${this.toFrTime()}`
    }

    return `${this.toFrDate()} ${this.toFrTime()}`
}

Date.prototype.difference = function (start_at) {
    if (!this) {
        return '--:--'
    }
    const timer = Math.floor(((!start_at ? (new Date()) : this).getTime() - (!start_at ? this : start_at).getTime()) / 1000)
    const hours = Math.floor(timer / 3600)
    const minutes = Math.floor((timer - hours * 3600) / 60)
    const secondes = timer - hours * 3600 - minutes * 60
    return `${hours}:${String(minutes).padStart(2, '0')}:${String(secondes).padStart(2, '0')}`
}