package com.ximple.io.dgn7;

import com.vividsolutions.jts.geom.Envelope;

/**
 * Utility
 *
 * @author Ulysses
 * @version 0.1
 * @since 2006/5/18 下午 01:33:00
 */
public final class Utility
{
    public static double converIntToDouble(int src)
    {

        return (double) ((long) ((src * 6) / 1000.0 + 0.5)) / 1000.0;
    }

    public static int converDoubleToInt(double src)
    {

        return (int) (src / 6 * 1000000.0);
    }

    public static int convertFromDGN(int aValue)
    {
        int newVal;

        newVal = (((aValue ^ 0x00008000) << 16) & 0xffff0000);
        newVal |= (aValue >>> 16) & 0x0000ffff;

        return newVal;
    }

    public static int converToDGN(int aValue)
    {
        int newVal;

        newVal = (aValue << 16 & 0xffff0000);
        newVal |= (((aValue ^ 0x80000000) >>> 16) & 0x0000ffff);

        return newVal;
    }

    public static double converIntToRotation(int aValue)
    {

        return aValue / 360000.0;
    }

    public static int converRotatioToInt(double aValue)
    {

        return (int) (aValue * 360000.0);
    }

    public static double converRotationToRadian(double aValue)
    {

        return aValue * Math.PI / 180;
    }

    public static double converUnitToCoord(int aValue)
    {
        double newVal;

        newVal = aValue / 1000.0;
        newVal += 2147483.648;    // 2147483.648 = 2 ^ 31

        return newVal;
    }

    public static int converCoordToUnit(double aValue)
    {
        double newVal = aValue;

        newVal -= 2147483.648;
        newVal = newVal * 1000.0;

        return (int) newVal;
    }

    public static Envelope converUnitToCoord(Envelope range)
    {
        if (range == null)
        {
            return null;
        }

        return new Envelope(converUnitToCoord((int) range.getMinX()), converUnitToCoord((int) range.getMaxX()),
                                         converUnitToCoord((int) range.getMinY()), converUnitToCoord((int) range.getMaxY()));
    }

    public static Envelope converCoordToUnit(Envelope range)
    {
        if (range == null)
        {
            return null;
        }

        return new Envelope(converCoordToUnit(range.getMinX()), converCoordToUnit(range.getMaxX()),
                                         converCoordToUnit(range.getMinY()), converCoordToUnit(range.getMaxY()));
    }

    public static double convertDGNToIEEEDouble(short[] src)
    {
        int[] tmp = new int[2];
        long  des;
        int   sign;
        int   exponent;
        int   rndbits;

        if (src == null)
        {
            throw new RuntimeException("Source short array is null");
        }

        tmp[0]   = ((src[0] << 16) & 0xffff0000) | (src[1] & 0x0000ffff);
        tmp[1]   = ((src[2] << 16) & 0xffff0000) | (src[3] & 0x0000ffff);
        sign     = (tmp[0] & 0x80000000);
        exponent = (tmp[0] >>> 23) & 0x000000ff;

        if (exponent != 0)
        {
            exponent = exponent - 129 + 1023;
        }

        rndbits = tmp[1] & 0x00000007;
        tmp[1]  = tmp[1] >>> 3;
        tmp[1]  = (tmp[1] & 0x1fffffff) | (tmp[0] << 29);

        if (rndbits != 0)
        {
            tmp[1] = tmp[1] | 0x00000001;
        }

        tmp[0] = (tmp[0] >>> 3) & 0x000fffff;
        tmp[0] = tmp[0] | (exponent << 20) | sign;
        des    = (((long) tmp[0] << 32));
        des    = des | (long) tmp[1];

        return Double.longBitsToDouble(des);
    }

    public static short[] convertIEEEDoubleToDGN(double src)
    {
        long newVal = Double.doubleToLongBits(src);

        // uint[]   tmp = new int[ 2 ];
        // ushort[] des = new short[ 4 ];
        int[]   tmp = new int[2];
        short[] des = new short[4];
        int     sign;
        int     exponent;

        tmp[0] = (int) ((newVal >>> 32));
        tmp[1] = (int) (newVal);

        // sign = ( int ) ( ( uint ) tmp[ 0 ] & 0x80000000 );
        sign     = tmp[0] & 0x80000000;
        exponent = (tmp[0] >>> 20) & 0x07ff;

        if (exponent != 0)
        {
            exponent = exponent - 1023 + 129;
        }

        if (exponent > 255)
        {
            if (sign != 0)
            {
                des[0] = -1;
            } else
            {
                des[0] = 0x7fff;
            }

            des[1] = -1;
            des[2] = -1;
            des[3] = -1;

            return des;
        } else if ((exponent < 0) || ((exponent == 0) && (sign == 0)))
        {
            des[0] = 0x0;
            des[1] = 0x0;
            des[2] = 0x0;
            des[3] = 0x0;

            return des;
        } else
        {
            tmp[0] = (tmp[0] << 3) | (tmp[1] >> 29);
            tmp[0] = tmp[0] & 0x007fffff;
            tmp[0] = tmp[0] | (exponent << 23) | sign;

            // changed by phil 07/05/2004
            // tmp[ 1 ] = tmp[ 1 ] >> 3;
            tmp[1] = tmp[1] << 3;
        }

        des[0] = (short) ((tmp[0] >>> 16) & 0x0000ffff);
        des[1] = (short) (tmp[0] & 0x0000ffff);
        des[2] = (short) ((tmp[1] >>> 16) & 0x0000ffff);
        des[3] = (short) (tmp[1] & 0x0000ffff);

        return des;
    }

    public static double getLength(double x1, double y1, double x2, double y2)
    {
        double dx     = x1 - x2;
        double dy     = y1 - y2;

        return Math.sqrt(Math.pow(dx, 2) + Math.pow(dy, 2));
    }
}