/*
   ui/paint.cc
   This file is part of the Osirion project and is distributed under
   the terms of the GNU General Public License version 2
*/

#include "auxiliary/functions.h"
#include "math/vector2f.h"
#include "render/gl.h"
#include "render/text.h"
#include "render/textures.h"
#include "ui/paint.h"

namespace ui
{

// contains the interface between the user interface and the render library
namespace paint {

void assign_color(const char c, const math::Color &color)
{
	render::Text::assign_color(c, color);
}

void color(float r, float g, float b, float a)
{
	gl::color(r, g, b, a);
}

void color(math::Color const & color)
{
	gl::color(color);
}

void color_code(const char c)
{
	render::Text::setcolor(c);
}

void border(const math::Vector2f &location, const math::Vector2f &size)
{
	using namespace gl;
	
	begin(LineLoop);
	vertex(location.x(), location.y());
	vertex(location.x() + size.width(), location.y());
	vertex(location.x() + size.width(), location.y() + size.height());
	vertex(location.x(), location.y() + size.height());
	end();
}

void rectangle(const math::Vector2f &location, const math::Vector2f &size)
{
	using namespace gl;
	
	begin(Quads);
	vertex(location.x(), location.y());
	vertex(location.x() + size.width(), location.y());
	vertex(location.x() + size.width(), location.y() + size.height());
	vertex(location.x(), location.y() + size.height());
	end();
}

// draw a bitmap
void bitmap(const math::Vector2f &location, const math::Vector2f &size, std::string const &texture)
{
	render::Textures::bind("bitmaps/" + texture);
	gl::enable(GL_TEXTURE_2D);
	
	gl::begin(gl::Quads);
	
	glTexCoord2f(0.0f, 0.0f);
	gl::vertex(location.x(), location.y());

	glTexCoord2f(1.0f, 0.0f);
	gl::vertex(location.x() + size.width(), location.y());

	glTexCoord2f(1.0f, 1.0f);
	gl::vertex(location.x() + size.width(), location.y() + size.height());

	glTexCoord2f(0.0f, 1.0f);
	gl::vertex(location.x(), location.y() + size.height());

	gl::end();
	
	gl::disable(GL_TEXTURE_2D);
}

// draw aligned text
void label(const math::Vector2f &location, const math::Vector2f &size, const Font *font, const std::string &text, unsigned int align)
{
	unsigned int align_horizontal = (align & 0x000F);
	if (!align_horizontal)
		align_horizontal = AlignLeft;
		
	unsigned int align_vertical = (align & 0x00F0);
	if (!align_vertical)
		align_vertical = AlignTop;
		
	// apply text font
	render::Text::setfont(font->name().c_str(), font->width(), font->height());
	
	// enable OpenGL textures
	gl::enable(GL_TEXTURE_2D);
	
	// determine the width and height of the text
	// FIXME support multiline text
	float text_height = 1.0f * font->height();
	float text_width = (float) aux::text_strip(text).size() * font->width();
	
	// calculate drawing position
	math::Vector2f v(location);
	
	switch (align_horizontal) {
		case AlignLeft:
			v[0] += font->width();
			break;
		case AlignHCenter:
			v[0] += (size.width() - text_width) / 2.0f;
			break;
		case AlignRight:
			v[0] += size.width() - text_width - font->width();
			break;
	}
	
	switch (align_vertical) {
		case AlignTop:
			v[1] += font->height()*0.5f;
			break;
		case AlignVCenter:
			v[1] += (size.height() - text_height) / 2.0f;
			break;
		case AlignBottom:
			v[1] += size.height() - text_height - font->height()*0.5f;
			break;
	}
	
	render::Text::draw(v.x(), v.y(), text);
	
	// disable OpenGL textures
	gl::disable(GL_TEXTURE_2D);
	
}

// draw unaligned text
void text(const math::Vector2f &location, const math::Vector2f &size, const Font *font, const std::string &text)
{
	render::Text::setfont(font->name().c_str(), font->width(), font->height());
	
	// enable OpenGL textures
	gl::enable(GL_TEXTURE_2D);
	
	render::Text::draw(location.x(), location.y(), text);
	
	// disable OpenGL textures
	gl::disable(GL_TEXTURE_2D);
}

// draw unaligned text
void text(const math::Vector2f &location, const math::Vector2f &size, const Font *font, std::stringstream & textstream)
{

	render::Text::setfont(font->name().c_str(), font->width(), font->height());
	
	// enable OpenGL textures
	gl::enable(GL_TEXTURE_2D);
	
	render::Text::draw(location.x(), location.y(), textstream);
	
	// disable OpenGL textures
	gl::disable(GL_TEXTURE_2D);
}

}

}