package controlP5;

/**
 * controlP5 is a processing gui library.
 * 
 * 2006-2015 by Andreas Schlegel
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2.1
 * of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General
 * Public License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 * 
 * @author Andreas Schlegel (http://www.sojamo.de)
 * @modified ##date##
 * @version ##version##
 * 
 */

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import processing.core.PApplet;
import processing.core.PFont;
import processing.core.PGraphics;

/**
 * A ControlFont is a container for a PFont that can be used to customize the font of a label.
 * (Designing the Font handling gave me a big headache, especially when it comes to calculating the
 * dimensions of a font which are not available at all times but only at certain times. The current
 * status I suppose is a good compromise and works for standard font handling cases. For any special
 * cases it will be difficult to convince me to make any changes.)
 * 
 * @example extra/ControlP5controlFont
 */
public class ControlFont {

	public static boolean DEBUG = false;

	/**
	 * set the RENDER_2X variable to true to double render text, this makes the font look bolder
	 * especially in OpenGL mode. use: ControlFont.RENDER_2X = true;
	 */
	public static boolean RENDER_2X;

	/**
	 * renders a PFont twice for better and sharper readability
	 */
	public static void sharp( ) {
		RENDER_2X = true;
	}

	/**
	 * sets the rendering of a PFont back to normal and single rendering.
	 */
	public static void normal( ) {
		RENDER_2X = false;
	}

	PFont pfont;
	List< String > txt;
	String s = "";
	private int top;
	private int bottom;
	private int center;
	private int height;
	private int width;
	private int baseline = 0;
	private int _myTextHeight = 1;
	private int[] offset = new int[ 2 ];
	private int size;

	public ControlFont( PFont theFont ) {
		this( theFont , checkFontSize( theFont ) );
	}

	public ControlFont( PFont theFont , int theFontSize ) {
		this( theFont , theFontSize , theFontSize + 2 );
	}

	public ControlFont( PFont theFont , int theFontSize , int theLineHeight ) {
		pfont = theFont;
		size = theFontSize;
		txt = new ArrayList< String >( );
	}

	static private int checkFontSize( PFont theFont ) {
		try {
			// was: return theFont.getFont().getSize(); but disappeared with p5 2.0b1
			return theFont.getSize( );
		} catch ( NullPointerException e ) {
			System.out.println( "ControlP5: could not find font-size details for font " + theFont.getName( ) + ", use constructor ControlFont(PFont theFont, int theFontSize) to specify the font size." );
			return 10;
		}
	}

	public void init( Label theLabel ) {
		// when the font changes, init is called.
		// width and height should be adjusted to the updated font here,
		// but we need PApplet here to determine the width of the label.
		// unfortunately we dont have access to PApplet here, so a change
		// might result in a 1-frame-flickr but doesnt necessarily need
		// to happen.
	}

	public void setSize( int theSize ) {
		size = theSize;
	}

	public int getSize( ) {
		/* quickfix http://code.google.com/p/controlp5/issues/detail?id=46 first check the pfont
		 * size then default back to size */
		return size;
	}

	public int getOffset( int theIndex ) {
		return offset[ theIndex ];
	}

	public int getTextHeight( ) {
		return _myTextHeight;
	}

	public int getWidth( ) {
		return width;
	}

	public int getHeight( ) {
		return height;
	}

	public int getCenter( ) {
		return center;
	}

	public int getTop( ) {
		return top;
	}

	public int getBottom( ) {
		return bottom;
	}

	public int getBaseline( ) {
		return baseline;
	}

	public PFont getFont( ) {
		return pfont;
	}

	public void adjust( PGraphics theGraphics , Label theLabel ) {
		if ( theLabel.isChanged( ) ) {
			theGraphics.textFont( pfont , size );
			// the origin of a PFont Label is top left corner, therefore
			// the following the following measures have to be calculated
			// when a font is changed. we have to do that here since PApplet
			// is required to calculate a font's ascent and descent value.
			// values are calculated based on the baseline (which is 0),
			// therefore center and top are negative values.
			// to order to sync the line height with the height of the font,
			// the value of lineHeightOffset carries this offset value.
			// This becomes necessary when working with multiple lines.
			top = -( int ) theGraphics.textAscent( );
			bottom = ( int ) theGraphics.textDescent( );
			center = -( int ) ( ( -top - bottom ) / 2 );
			height = theLabel.isMultiline( ) ? theLabel.getHeight( ) : ( int ) ( theGraphics.textAscent( ) + theGraphics.textDescent( ) );
			width = theLabel.isMultiline( ) ? theLabel.getWidth( ) : ( int ) theGraphics.textWidth( theLabel.getTextFormatted( ) );
			if ( theLabel.isMultiline( ) ) {
				calculateHeight( theGraphics , theLabel );
			}
			theLabel.setChanged( false );
		}
	}

	private void calculateHeight( PGraphics theGraphics , Label theLabel ) {
		txt.clear( );
		String myString = theLabel.getTextFormatted( );
		List< String > paragraphs = Arrays.asList( myString.split( "\n" ) );
		// does not recognize linebreaks at the end of theString.
		myString = "";
		for ( String p : paragraphs ) {
			List< String > words = Arrays.asList( p.split( "\\s" ) );
			for ( String w : words ) {
				if ( theGraphics.textWidth( myString + w ) < width ) {
					myString += w + " ";
				} else {
					txt.add( myString.substring( 0 , PApplet.max( 0 , myString.length( ) - 1 ) ) );
					myString = w + " ";
				}
			}
			txt.add( myString.substring( 0 , myString.length( ) - 1 ) );
			myString = "";
		}
		if ( theLabel.getHeight( ) % theLabel.getLineHeight( ) != 0 ) {
			txt.add( "" );
		}
		_myTextHeight = ( PApplet.round( txt.size( ) * theLabel.getLineHeight( ) ) );
		int maxLineNum = PApplet.round( theLabel.getHeight( ) / theLabel.getLineHeight( ) );
		int offset = ( int ) ( PApplet.max( 0 , txt.size( ) - maxLineNum ) * ( PApplet.abs( theLabel.getOffsetYratio( ) ) ) );
		int lim = PApplet.min( txt.size( ) , maxLineNum );
		s = "";
		for ( int i = 0 ; i < lim ; i++ ) {
			s += txt.get( i + offset ) + "\n";
		}
	}

	public int getOverflow( ) {
		return ( _myTextHeight - height );
	}

	public void draw( ControlP5 c , Label theLabel ) {
		draw( c.pg , theLabel );
	}

	public void draw( PGraphics theGraphics , Label theLabel ) {
		
		PFont loadedFont = theGraphics.textFont;
		float loadedSize = theGraphics.textSize;
		if ( loadedFont == null ) {
			theGraphics.textSize( loadedSize ); // forces default font
			loadedFont = theGraphics.textFont;
		}
		int loadedAlign = theGraphics.textAlign;

		
		theGraphics.textFont( pfont , size );
		theGraphics.textAlign( theLabel.textAlign );
		theGraphics.fill( theLabel.getColor( ) );
		
		if ( theLabel.isMultiline( ) ) {
			theGraphics.fill( theLabel.getColor( ) );
			theGraphics.textLeading( theLabel.getLineHeight( ) );
			theGraphics.text( s , 0 , 0 , theLabel.getWidth( ) , theLabel.getHeight( ) );
		} else {
			
			theGraphics.translate( 0 , -top + 1 );
			debug( theGraphics , theLabel );
			theGraphics.fill( theLabel.getColor( ) );
			theGraphics.textLeading( theLabel.getLineHeight( ) );
			theGraphics.text( theLabel.getTextFormatted( ) , 0 , 0 );
			if ( RENDER_2X ) {
				theGraphics.text( theLabel.getTextFormatted( ) , 0 , 0 );
			}
			
		}

		theGraphics.textFont( loadedFont , loadedSize );
		theGraphics.textAlign( loadedAlign );
		
	}

	private void debug( PGraphics theGraphics , Label theLabel ) {
		if ( DEBUG ) {

			theGraphics.stroke( 0 , 255 , 0 ); // BASELINE
			theGraphics.line( 0 , getBaseline( ) , theGraphics.textWidth( theLabel.getText( ) ) , getBaseline( ) );

			theGraphics.stroke( 0 , 0 , 255 ); // TOP
			theGraphics.line( 0 , getTop( ) , theGraphics.textWidth( theLabel.getText( ) ) , getTop( ) );

			theGraphics.stroke( 255 , 255 , 0 ); // BOTTOM
			theGraphics.line( 0 , getBottom( ) , theGraphics.textWidth( theLabel.getText( ) ) , getBottom( ) );

			theGraphics.stroke( 255 , 0 , 0 ); // CENTER
			theGraphics.line( 0 , getCenter( ) , theGraphics.textWidth( theLabel.getText( ) ) , getCenter( ) );

			theGraphics.stroke( 255 , 128 , 0 ); // CENTER_CAPS
			theGraphics.line( 0 , getTop( ) / 2 , theGraphics.textWidth( theLabel.getText( ) ) , getTop( ) / 2 );

			theGraphics.noStroke( );
		}
	}

	public static int getWidthFor( String theText , Label theLabel , PGraphics theGraphics ) {
		theGraphics.textFont( theLabel.getFont( ).pfont , theLabel.getFont( ).size );
		return ( int ) theGraphics.textWidth( theText );
	}

}

// textorize, a Ruby-based font rasterizer command line utility for Mac OS X
// http://textorize.org/