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/*
  *  Copyright (C) 2022 github.com/REAndroid
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
package com.reandroid.arsc.coder;

public class ComplexUtil {

    public static String decodeComplex(boolean fraction, int complex_value){
        int radixFlag = (complex_value >> COMPLEX_RADIX_SHIFT) & COMPLEX_RADIX_MASK;
        Radix radix = Radix.forFlag(radixFlag);

        int mantissa = (complex_value & ( COMPLEX_MANTISSA_MASK <> COMPLEX_UNIT_SHIFT) & COMPLEX_UNIT_MASK;
        ComplexUnit unit;
        if(fraction){
            unit = UnitFraction.valueOf(unit_flag);
        }else {
            unit = UnitDimension.valueOf(unit_flag);
        }
        return radix.formatFloat(fraction, value) + unit;
    }
    public static int encodeComplex(float value, ComplexUnit unit){
        boolean neg = value < 0;
        if (neg) {
            value = -value;
        }
        if(unit.isFraction()){
            value = value / 100.0f;
        }
        long bits = (long)(value*(1<<23) + 0.5f);

        Radix radix = Radix.getRadix(bits);
        int mantissa = (int)((bits>>radix.getShift()) & COMPLEX_MANTISSA_MASK);
        if (neg) {
            mantissa = (-mantissa) & COMPLEX_MANTISSA_MASK;
        }
        int result = (radix.getFlag()<= 0.5f){
                i = i + 1;
            }
            value = ((float) i)/multiplier;
            if(neg){
                value = -value;
            }
            if(scale){
                value = value * 100.0f;
            }
            return Float.toString(value);
        }
        public static Radix forFlag(int flag){
            if(flag == 0){
                return RADIX_23p0;
            }
            if(flag == 1){
                return RADIX_16p7;
            }
            if(flag == 2){
                return RADIX_8p15;
            }
            if(flag == 3){
                return RADIX_0p23;
            }
            throw new NumberFormatException("Unknown radix flag = "+flag);
        }
        public static Radix getRadix(long bits){
            if ((bits&0x7fffff) == 0) {
                return RADIX_23p0;
            }
            if ((bits&0xffffffffff800000L) == 0) {
                return RADIX_0p23;
            }
            if ((bits&0xffffffff80000000L) == 0) {
                return RADIX_8p15;
            }
            if ((bits&0xffffff8000000000L) == 0) {
                return RADIX_16p7;
            }
            throw new NumberFormatException("Radix bits out of range bits = "+bits);
        }
        public int getFlag() {
            return flag;
        }
        public int getShift() {
            return shift;
        }
        public float getMultiplier() {
            return multiplier;
        }
    }
    private static final int COMPLEX_RADIX_SHIFT = 4;
    private static final int COMPLEX_RADIX_MASK = 0x3;
    private static final int COMPLEX_MANTISSA_SHIFT = 8;
    private static final int COMPLEX_MANTISSA_MASK = 0x00ffffff;
    private static final float MANTISSA_MULT = (1.0f / (1 << 8));
    private static final int COMPLEX_UNIT_SHIFT = 0;
    private static final int COMPLEX_UNIT_MASK = 0xf;
}