export class CommonUtils {
    /**
     * Check if the current rut is valid or not.
     * 
     * @param rut
     */
    public static  validRut(rut: any): boolean {
        if (typeof rut !== 'string') {
            return false
        }
        if (!/^0*(\d{1,3}(\.?\d{3})*)-?([\dkK])$/.test(rut)) {
            return false
        }

        rut = this.cleanRut(rut)

        let t = parseInt(rut.slice(0, -1), 10)
        let m = 0
        let s = 1

        while (t > 0) {
            s = (s + (t % 10) * (9 - m++ % 6)) % 11
            t = Math.floor(t / 10)
        }

        const v = s > 0 ? '' + (s - 1) : 'K'
        return v === rut.slice(-1)
    }

    /**
     * Format a rut input to add correct format
     * @param rut 
     */
    public static  formatRut(rut: string, useDotDelimiter: boolean) {
        rut = this.cleanRut(rut)

        let result = rut.slice(-4, -1) + '-' + rut.substring(rut.length - 1)
        for (let i = 4; i < rut.length; i += 3) {
            if (useDotDelimiter) {
                result = rut.slice(-3 - i, -i) + '.' + result
            } else {
                result = rut.slice(-3 - i, -i) + result
            }

        }
        if (result == '-') {
            result = '';
        }
        return result
    }

    /**
     * Remove dots from input rut 
     * @param rut 
     */
    public static  cleanRut(rut: string) {
        return typeof rut === 'string' ?
            rut.replace(/^0+|[^0-9kK]+/g, '').toUpperCase() :
            ''
    }
}