package ij.util;
import java.text.*;
import java.awt.*;

/** This class contains static utility methods for replacing fonts that are not available on the
 *  current system.
 */

public class FontUtil {

    /** Returns a font with the given family name or, if not available, a similar font, e.g. Helvetica replaced by Arial */
    public static Font getFont(String fontFamilyName, int style, float size) {
        Font font = new Font(fontFamilyName, style, (int)size);
        if (!font.getFamily().startsWith(fontFamilyName)) {
            String[] similarFonts = getSimilarFontsList(fontFamilyName);
            font = getFont(similarFonts, style, (int)size);
        }
        if (size != (int)size)
            font = font.deriveFont(size);
        return font;
    }

    /** Returns the font for first element of the 'fontNames' array, where a Font Family Name starts with this name.
     *  E.g. if fontNames = {"Times New Roman", "Serif" and the system has no "Times New Roman", but finds "Serif",
     *  it would return a "Serif" font with suitable style and size */
    private static Font getFont(String[] fontNames, int style, int size) {
        int iSize = (int)size;
        Font font = null;
        for (String fontName : fontNames) {
            font = new Font(fontName, style, iSize);
            if (font.getFamily().startsWith(fontName))
                break;
        }
        return font;
    }

    /** For a few basic font types, gets a list of replacement font families
     *  Note that java's 'SansSerif' has wider characters (significantly different metrics) than the other
     *  sans-serif fonts in the list; thus it should be considered a fallback option only.
     *  Also note that some fonts (Times, Helvetica, Courier, Monospace, Serif) tend to truncate some
     *  diacritical marks when using FontMetrics.getHeight (as ImageJ does), e.g. the ring of the
     *  Angstrom symbol Å may be clipped (at least on Java 1.6/Mac)
     */
    public static String[] getSimilarFontsList(String fontFamily) {
        if (fontFamily.indexOf("Times")>=0 || fontFamily.indexOf("Serif")>=0)
            return new String[]{"Times New Roman", "Times", "Liberation Serif", "Serif"};
        else if (fontFamily.indexOf("Arial")>=0 || fontFamily.indexOf("Helvetica")>=0 || fontFamily.indexOf("Sans")>=0)
            return new String[]{"Arial", "Helvetica", "Helvetica Neue", "Liberation Sans", "SansSerif"};
        else if (fontFamily.indexOf("Courier")>=0 || fontFamily.indexOf("Mono")>=0)
            return new String[]{"Courier New", "Courier", "Liberation Mono", "Monospaced"};
        else
            return new String[]{fontFamily};
    }


}