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package org.osgeo.proj4j.units;

import org.osgeo.proj4j.util.ProjectionMath;

public class Angle
{

    /**
     * Parses a text representation of a degree angle in various formats.
     *
     * Formats include DMS and DD in the forms
     * supported by {@link AngleFormat},
     * as in the following examples:
     *      * 123.12
     * -123.12
     * 123.12W
     *
     * 123d44m44.555s
     * 123d44'44.555"
     * 123d44mN
     * 
     *
     * @param text
     * @return the value of the angle, in degrees
     */
    public static double parse(String text)
        throws NumberFormatException
    {
        double d = 0, m = 0, s = 0;
        double result;
        boolean negate = false;
        int length = text.length();
        if (length > 0) {
            char c = Character.toUpperCase(text.charAt(length-1));
            switch (c) {
            case AngleFormat.CH_W:
            case AngleFormat.CH_S:
                negate = true;
                // Fall into...
            case AngleFormat.CH_E:
            case AngleFormat.CH_N:
                text = text.substring(0, length-1);
                break;
            }
        }
        int i = text.indexOf(AngleFormat.CH_DEG_ABBREV);
        if (i == -1)
            i = text.indexOf(AngleFormat.CH_DEG_SYMBOL);
        if (i != -1) {
            String dd = text.substring(0, i);
            String mmss = text.substring(i+1);
            d = Double.valueOf(dd).doubleValue();
            i = mmss.indexOf(AngleFormat.CH_MIN_ABBREV);
            if (i == -1)
                i = mmss.indexOf(AngleFormat.CH_MIN_SYMBOL);
            if (i != -1) {
                if (i != 0) {
                    String mm = mmss.substring(0, i);
                    m = Double.valueOf(mm).doubleValue();
                }
                if (mmss.endsWith(AngleFormat.STR_SEC_ABBREV) || mmss.endsWith(AngleFormat.STR_SEC_SYMBOL))
                    mmss = mmss.substring(0, mmss.length()-1);
                if (i != mmss.length()-1) {
                    String ss = mmss.substring(i+1);
                    s = Double.valueOf(ss).doubleValue();
                }
                if (m < 0 || m > 59)
                    throw new NumberFormatException("Minutes must be between 0 and 59");
                if (s < 0 || s >= 60)
                    throw new NumberFormatException("Seconds must be between 0 and 59");
            } else if (i != 0)
                if (mmss.length() == 0)
                    m = 0;
                else
                    m = Double.valueOf(mmss).doubleValue();
            result = ProjectionMath.dmsToDeg(d, m, s);
        } else {
            result = Double.parseDouble(text);
        }
        if (negate)
            result = -result;
        return result;
    }

}