//This file is part of Photon (http://photon.sourceforge.net)
//Copyright (C) 2004-2005 James Turk
//
// Author:
//  James Turk (jpt2433@rit.edu)
//
// Version:
//  $Id: Font.hpp,v 1.2 2005/07/03 05:20:49 cozman Exp $

#ifndef PHOTON_VIDEO_FONT_HPP
#define PHOTON_VIDEO_FONT_HPP

#include "video/FontResourceManager.hpp"
#include "ResourceManaged.hpp"

namespace photon
{
namespace video
{

class StreamFlusher { };
std::ostream& operator<<(std::ostream& os, const StreamFlusher& rhs);

// Class: Font
//  Simple OO wrapper around a TrueType font that can be drawn to textures and
//  rendered via OpenGL.
// 
//  Since Font is a child of <ResourceManaged>, all memory management is 
//  taken care of.
// 
// Operators:
//  - Font = Font
//  - bool : True if font is loaded, false if not.
//  - ostream& << Font
class Font: public ResourceManaged<FontResourceManager>
{
    
// Resource Creation
public:
    // Function: addResource
    //  Define a new named font resource, works just like 
    //  <ResourceManaged::addResource> except that it takes a size for the font.
    //
    // Parameters:
    //  name - Name to give to font resource.
    //  path - Path of font file.
    //  size - Point size for the font.
    static void addResource(const std::string& name, const std::string& path, 
                            uint size);
    
    // Function: addResource
    //  Define a new unaliased font resource (name == path). Works just like 
    //  <ResourceManaged::addResource> except that it takes a size for the font.
    //
    // Parameters:.
    //  path - Path of font file.
    //  size - Point size for the font.
    static void addResource(const std::string& path, uint size);

// Group: (Con/De)structors 
public:
    // Function: Font
    //  Default constructor, initalizes internal state of Font.
    Font();

    // Function: Font
    //  Copy constructor, copies another Font.
    // 
    // Parameters:
    //  rhs - Font to construct copy of.
    Font(const Font &rhs);

    // Function: Font
    // Initializing constructor, loads Font via call to <open>.
    // 
    // Parameters:
    //  name - Name of the Font <Resource> to open.
    // 
    // See Also: 
    //  <open>
    Font(const std::string& name);

// Group: General
public:

    // Function: open
    //  Opens an TrueType font.
    // 
    //  Loading is done via FreeType.
    // 
    // Parameters:
    //  name - Name of the Font <Resource> to open.
    void open(const std::string& name);
    
    bool isValid() const;

    Font& operator=(const Font &rhs);
    operator bool() const;
    
// Group: Drawing
public:
    void drawText(float x, float y, const char *str, ...) const;
    void drawText(float x, float y, const std::string& str) const;

    std::ostream& beginDraw(float x, float y);
    StreamFlusher endDraw();

// Group: Font Metrics
public:
    unsigned int calcStringWidth(const std::string& str) const;
    unsigned int getHeight() const;
    
private:
    // font data
    uint texID_;
    uint listBase_;
    std::vector<ubyte> widths_;
    ubyte height_;
    // stream drawing stuff
    std::ostringstream ss_;
    float drawX_;
    float drawY_;
};

}
}

#endif  //PHOTON_VIDEO_FONT_HPP