/*      _______   __   __   __   ______   __   __   _______   __   __
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 * Copyright (c) 2004, 2005, 2006, 2007 Olof Naessén and Per Larsson
 *
 *                                                         Js_./
 * Per Larsson a.k.a finalman                          _RqZ{a<^_aa
 * Olof Naessén a.k.a jansem/yakslem                _asww7!uY`>  )\a//
 *                                                 _Qhm`] _f "'c  1!5m
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#ifndef GCN_IMAGEFONT_HPP
#define GCN_IMAGEFONT_HPP

#include <string>

#include "guisan/font.hpp"
#include "guisan/platform.hpp"
#include "guisan/rectangle.hpp"

namespace gcn
{
	class Color;
	class Graphics;
	class Image;

	/**
	 * A font using an image containing the font data. It implements the font
	 * class. You can use any filetype for the font data as long as it can be
	 * loaded with your ImageLoader.
	 *
	 * This are two examples of an image containing a font.
	 *  \image html imagefontexample.bmp
	 *  \image html imagefontexample2.bmp
	 *
	 * The Image font format works like this: The first pixel, the pixal at
	 * coordinate (0,0), tells which color to look for when seperating glyphs.
	 * You create an image with your glyphs and simple separates them with
	 * the seperation color. When you create your ImageFont you supply the
	 * constructor with the glyphs present in your image. When creating an
	 * ImageFont for the image data in the first example above, the following
	 * constructor call would be used.
	 * @code gcn::ImageFont imageFont("fixedfont_big.bmp"," abcdefghijklmno\
pqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); @endcode
	 * Noteworthy is that the first glyph actually gives the width of space.
	 * Glyphs can, as seen in the second example above, be seperated with
	 * horizontal lines making it possible to draw glyphs on more then one
	 * line in the image. However, these vertical lines must be of one pixel
	 * size!
	 */
	class GCN_CORE_DECLSPEC ImageFont : public Font
	{
	public:

		/**
		 * Constructor which takes an image file containing the font and
		 * a string containing the glyphs. The glyphs in the string should
		 * be in the same order as they appear in the font image.
		 *
		 * @param filename the filename of the image.
		 * @param glyphs the glyphs found in the image.
		 * @throws Exception when glyph list is incorrect or the font file is
		 *                   corrupt or if no ImageLoader exists.
		 */
		ImageFont(const std::string& filename, const std::string& glyphs);

		/**
		 * Constructor which takes an image file containing the font and
		 * two boundaries of ASCII values. The font image should include
		 * all glyphs specified with the boundaries in increasing ASCII
		 * order. The boundaries are inclusive.
		 *
		 * @param filename the filename of the image.
		 * @param glyphsFrom the ASCII value of the first glyph found in the
		 *                   image.
		 * @param glyphsTo the ASCII value of the last glyph found in the
		 *                 image.
		 * @throws Exception when glyph bondaries are incorrect or the font
		 *                   file is corrupt or if no ImageLoader exists.
		 */
		explicit ImageFont(const std::string& filename, unsigned char glyphsFrom = 32,
		                   unsigned char glyphsTo = 126);

		/**
		 * Destructor.
		 */
		virtual ~ImageFont();

		/**
		 * Draws a glyph.
		 *
		 * NOTE: You normally won't use this function to draw text since
		 *       the Graphics class contains better functions for drawing
		 *       text.
		 *
		 * @param graphics a graphics object to be used for drawing.
		 * @param glyph a glyph to draw.
		 * @param x the x coordinate where to draw the glyph.
		 * @param y the y coordinate where to draw the glyph.
		 * @return the width of the glyph in pixels.
		 * @see Graphics
		 */
		virtual int drawGlyph(Graphics* graphics, unsigned char glyph,
							  int x, int y);

		/**
		 * Sets the spacing between rows in pixels.  Default is 0 pixels.
		 * The spacing can be negative.
		 *
		 * @param spacing the spacing in pixels.
		 */
		virtual void setRowSpacing(int spacing);

		/**
		 * Gets the spacing between rows in pixels.
		 *
		 * @return the spacing.
		 */
		virtual int getRowSpacing();

		/**
		 * Sets the spacing between letters in pixels. Default is 0 pixels.
		 * The spacing can be negative.
		 *
		 * @param spacing the spacing in pixels
		 */
		virtual void setGlyphSpacing(int spacing);

		/**
		 * Gets the spacing between letters in pixels.
		 *
		 * @return the spacing.
		 */
		virtual int getGlyphSpacing();

		/**
		 * Gets a width of a glyph.
		 *
		 * @param glyph the glyph which width will be returned
		 * @return the width of a glyph
		 */
		[[nodiscard]] virtual int getWidth(unsigned char glyph) const;


		// Inherited from Font

		[[nodiscard]] int getWidth(const std::string& text) const override;

		void drawString(Graphics* graphics, const std::string& text,
						int x, int y) override;

		[[nodiscard]] int getHeight() const override;

		int getStringIndexAt(const std::string& text, int x) override;

	protected:
		void addGlyph(unsigned char c, int& x, int& y, const Color& separator);

		Rectangle mGlyph[256];
		int mHeight;
		int mGlyphSpacing;
		int mRowSpacing;
		Image* mImage;
		std::string mFilename;
	};
}

#endif // end GCN_IMAGEFONT_HPP