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package com.sun.star.report.pentaho.styles;

import org.jfree.layouting.input.style.values.CSSNumericType;
import org.jfree.layouting.input.style.values.CSSNumericValue;

/**
 * A helper class that sums up various CSS-length. The various unit types are
 * kept separate until the final result is computed to minimize the computation
 * inaccuracy.
 *
 * @author Thomas Morgner
 * @since 15.03.2007
 */
public class LengthCalculator
{
    // and centimeter (x10)

    private double millimeter;
    // and pica (x12) and inch(x72). Px is assumed to be in 96dpi.
    private double point;
    private double pixel;

    public LengthCalculator()
    {
    }

    public void add(final CSSNumericValue value)
    {
        if (value == null)
        {
            return;
        }

        final CSSNumericType numericType = value.getType();
        if (numericType == CSSNumericType.CM)
        {
            millimeter += value.getValue() * 10;
        }
        else if (numericType == CSSNumericType.MM)
        {
            millimeter += value.getValue();
        }
        else if (numericType == CSSNumericType.PT)
        {
            point += value.getValue();
        }
        else if (numericType == CSSNumericType.PC)
        {
            point += 12 * value.getValue();
        }
        else if (numericType == CSSNumericType.INCH)
        {
            point += 72 * value.getValue();
        }
        else if (numericType == CSSNumericType.PX)
        {
            pixel += value.getValue();
        }
        // LOGGER.debug ("Adding " + value  + " [mm: " + millimeter + "] [pt: " + point + "] px: [" + pixel + "]");
    }

    public CSSNumericValue getResult()
    {
        if (pixel == 0 && point == 0)
        {
            return CSSNumericValue.createValue(CSSNumericType.MM, millimeter);
        }
        if (pixel == 0 && millimeter == 0)
        {
            return CSSNumericValue.createValue(CSSNumericType.PT, point);
        }
        if (point == 0 && millimeter == 0)
        {
            return CSSNumericValue.createValue(CSSNumericType.PX, pixel);
        }
        // else convert it.

        double result = point;
        result += (millimeter * 10 * 72 / 254);
        result += pixel * 72 / 96;

        return CSSNumericValue.createValue(CSSNumericType.PT, result);
    }
}