export class UnitsConverter {
    private CENTIMETER_TO_METER_RATE = 0.01;
    private METER_TO_CENTIMETER_RATE = 100;
    private MINIMETER_TO_METER_RATE = 0.001;
    private METER_TO_MINIMETER_RATE = 1000;
    private KILO_TO_NORMAL_RATE = 1000;
    private NORMAL_TO_KILO_RATE = 0.001;
    private INCH_TO_METER_RATE = 0.0254;
    private METER_TO_INCH_RATE = 39.3700787;
    private FOOT_TO_METER_RATE = 0.3048;
    private METER_TO_FOOT_RATE = 3.2808399;
    private KIP_TO_NEWTON_RATE = 4448.2216;
    private NEWTON_TO_KIP_RATE = 0.00022480894387096;

    private round(roundFactor, roundedNumber) {
        const factor = Math.pow(10, roundFactor + 1);
        roundedNumber = Math.round(Math.round(roundedNumber * factor) / 10);
        return roundedNumber / (factor / 10);
    }

    public convertFromUnitsToSI(value: number, unit: string): number {
        if (unit === 'mm') {
            return this.convert(this.MINIMETER_TO_METER_RATE, value);
        } else if (unit === 'cm') {
            return this.convert(this.CENTIMETER_TO_METER_RATE, value);
        } else if (unit === 'ft') {
            return this.convert(this.FOOT_TO_METER_RATE, value);
        } else if (unit === 'inch') {
            return this.convert(this.INCH_TO_METER_RATE, value);
        } else if (unit === 'm') {
            return this.convert(1.0, value);
        } else if (unit === 'kip') {
            return this.convert(this.KIP_TO_NEWTON_RATE, value);
        } else if (unit === 'kip-ft') {
            return this.convert(this.KIP_TO_NEWTON_RATE * this.FOOT_TO_METER_RATE, value);
        } else if (unit === 'kN') {
            return this.convert(this.KILO_TO_NORMAL_RATE, value);
        } else if (unit === 'kNm') {
            return this.convert(this.KILO_TO_NORMAL_RATE, value);
        } else if (unit === 'kNcm') { return this.convert(this.KILO_TO_NORMAL_RATE * this.CENTIMETER_TO_METER_RATE, value); }
    }
    public convertFromSIToUnits(value: number, unit: string, roundFactor?: number): number {
        if (unit === 'mm') {
            return this.convert(this.METER_TO_MINIMETER_RATE, value, roundFactor);
        } else if (unit === 'cm') {
            return this.convert(this.METER_TO_CENTIMETER_RATE, value, roundFactor);
        } else if (unit === 'ft') {
            return this.convert(this.METER_TO_FOOT_RATE, value, roundFactor);
        } else if (unit === 'inch') {
            return this.convert(this.METER_TO_INCH_RATE, value, roundFactor);
        } else if (unit === 'm') {
            return this.convert(1.0, value, roundFactor);
        } else if (unit === 'kip') {
            return this.convert(this.NEWTON_TO_KIP_RATE, value, roundFactor);
        } else if (unit === 'kip-ft') {
            return this.convert(this.NEWTON_TO_KIP_RATE * this.METER_TO_FOOT_RATE, value, roundFactor);
        } else if (unit === 'kN') {
            return this.convert(this.NORMAL_TO_KILO_RATE, value, roundFactor);
        } else if (unit === 'kNm') {
            return this.convert(this.NORMAL_TO_KILO_RATE, value, roundFactor);
        } else if (unit === 'kNcm') { return this.convert(this.NORMAL_TO_KILO_RATE * this.METER_TO_CENTIMETER_RATE, value, roundFactor); }
    }
    public convert(rate: number, value: number, roundFactor?: number): number {
        let tempNumber = value * rate;
        if (roundFactor) {
            tempNumber = this.round(roundFactor, tempNumber);
        }
        return tempNumber;
    }
}