package com.horcrux.svg;

// https://www.w3.org/TR/SVG/types.html#InterfaceSVGLength
enum SVGLengthUnitType {
    SVG_LENGTHTYPE_UNKNOWN,
    SVG_LENGTHTYPE_NUMBER,
    SVG_LENGTHTYPE_PERCENTAGE,
    SVG_LENGTHTYPE_EMS,
    SVG_LENGTHTYPE_EXS,
    SVG_LENGTHTYPE_PX,
    SVG_LENGTHTYPE_CM,
    SVG_LENGTHTYPE_MM,
    SVG_LENGTHTYPE_IN,
    SVG_LENGTHTYPE_PT,
    SVG_LENGTHTYPE_PC,
}

class SVGLength {
    final double value;
    final SVGLengthUnitType unit;
    SVGLength() {
        value = 0;
        unit = SVGLengthUnitType.SVG_LENGTHTYPE_UNKNOWN;
    }
    SVGLength(double number) {
        value = number;
        unit = SVGLengthUnitType.SVG_LENGTHTYPE_NUMBER;
    }
    SVGLength(String length) {
        length = length.trim();
        int stringLength = length.length();
        int percentIndex = stringLength - 1;
        if (stringLength == 0 || length.equals("normal")) {
            unit = SVGLengthUnitType.SVG_LENGTHTYPE_UNKNOWN;
            value = 0;
        } else if (length.codePointAt(percentIndex) == '%') {
            unit = SVGLengthUnitType.SVG_LENGTHTYPE_PERCENTAGE;
            value = Double.valueOf(length.substring(0, percentIndex));
        } else {
            int twoLetterUnitIndex = stringLength - 2;
            if (twoLetterUnitIndex > 0) {
                String lastTwo = length.substring(twoLetterUnitIndex);
                int end = twoLetterUnitIndex;
                switch (lastTwo) {
                    case "px":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_NUMBER;
                        break;

                    case "em":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_EMS;
                        break;
                    case "ex":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_EXS;
                        break;

                    case "pt":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_PT;
                        break;

                    case "pc":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_PC;
                        break;

                    case "mm":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_MM;
                        break;

                    case "cm":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_CM;
                        break;

                    case "in":
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_IN;
                        break;

                    default:
                        unit = SVGLengthUnitType.SVG_LENGTHTYPE_NUMBER;
                        end = stringLength;
                }
                value = Double.valueOf(length.substring(0, end));
            } else {
                unit = SVGLengthUnitType.SVG_LENGTHTYPE_NUMBER;
                value = Double.valueOf(length);
            }
        }
    }
}