/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
**]  All rights reserved.
*
* vi:ts=4 sw=4 tw=75
*
* Distributable under the terms and conditions of the 2-clause BSD license;
* see the file COPYING for a complete text of the license.
*
**************************************************************************/

#include <Moof/Aabb.hh>
#include <Moof/Log.hh>
#include <Moof/OpenGL.hh>
#include <Moof/Video.hh>

#include "Hud.hh"


ProgressBar::ProgressBar(const Mf::Texture& tilemap,
						 Mf::Texture::TileIndex index) :
	mProgress(0.0),
	mTilemap(tilemap)
{
	tilemap.getTileCoords(index, mTexCoords);

	Mf::Scalar half = (mTexCoords[2] - mTexCoords[0]) / 2.0 + mTexCoords[0];
	mMidCoords[0] = half - 0.01;
	mMidCoords[1] = half + 0.01;
}

void ProgressBar::resize(const Mf::Rectangle& rect)
{
	Mf::logInfo << "rect: " << rect.min << ", " << rect.max << std::endl;
	Mf::Scalar height = rect.max[1] - rect.min[1];
	Mf::Scalar halfHeight = height / 2.0;

	mWidth = rect.max[0] - rect.min[0] - height;
	ASSERT(mWidth > 0);

	mVertices[0] = rect.min;
	mVertices[1] = Mf::Vector2(rect.min[0] + halfHeight, rect.min[1]);
	mVertices[2] = mVertices[1];
	mVertices[3] = Mf::Vector2(rect.min[0] + height,     rect.min[1]);
	mVertices[4] = Mf::Vector2(rect.min[0] + height,     rect.max[1]);
	mVertices[5] = Mf::Vector2(rect.min[0] + halfHeight, rect.max[1]);
	mVertices[6] = mVertices[5];
	mVertices[7] = Mf::Vector2(rect.min[0],              rect.max[1]);

	setProgress(mProgress);
}

void ProgressBar::setProgress(Mf::Scalar progress)
{
	Mf::Scalar halfHeight = (mVertices[7][1] - mVertices[0][1]) / 2.0;

	mVertices[2][0] = mVertices[1][0] + progress * mWidth;
	mVertices[3][0] = mVertices[1][0] + progress * mWidth + halfHeight;
	mVertices[4][0] = mVertices[1][0] + progress * mWidth + halfHeight;
	mVertices[5][0] = mVertices[1][0] + progress * mWidth;

	mProgress = progress;
}

void ProgressBar::draw(Mf::Scalar alpha) const
{
	if (Mf::isEqual(mProgress, 0.0))
	{
		// don't draw anything if the progress is 0%
		return;
	}

	glColor4f(1.0f, 1.0f, 1.0f, 0.85f);
	mTilemap.bind();

	glBegin(GL_QUADS);
		glTexCoord(mTexCoords[0], mTexCoords[1]);
		glVertex(mVertices[0]);
		glTexCoord(mMidCoords[0], mTexCoords[3]);
		glVertex(mVertices[1]);
		glTexCoord(mMidCoords[0], mTexCoords[5]);
		glVertex(mVertices[6]);
		glTexCoord(mTexCoords[6], mTexCoords[7]);
		glVertex(mVertices[7]);

		glTexCoord(mMidCoords[0], mTexCoords[1]);
		glVertex(mVertices[1]);
		glTexCoord(mMidCoords[1], mTexCoords[3]);
		glVertex(mVertices[2]);
		glTexCoord(mMidCoords[1], mTexCoords[5]);
		glVertex(mVertices[5]);
		glTexCoord(mMidCoords[0], mTexCoords[7]);
		glVertex(mVertices[6]);

		glTexCoord(mMidCoords[1], mTexCoords[1]);
		glVertex(mVertices[2]);
		glTexCoord(mTexCoords[2], mTexCoords[3]);
		glVertex(mVertices[3]);
		glTexCoord(mTexCoords[4], mTexCoords[5]);
		glVertex(mVertices[4]);
		glTexCoord(mMidCoords[1], mTexCoords[7]);
		glVertex(mVertices[5]);
	glEnd();
}


Hud::Hud(GameState& state) :
	mState(state),
	mBar1(Mf::Texture("StatusBars"), 0),
	mBar2(Mf::Texture("StatusBars"), 2),
	mFont("Font")
{
	Mf::Video* video = Mf::Video::current();
	ASSERT(video && "a current video context should be set");
	resize(video->getWidth(), video->getHeight());
}


void Hud::resize(int width, int height)
{
	cml::matrix_orthographic_RH(mProjection, 
			SCALAR(0.0), 
			Mf::Scalar(width), SCALAR(0.0), Mf::Scalar(height),
			SCALAR(1.0), SCALAR(-1.0), cml::z_clip_neg_one);

	// position the two progress bars at the top-left of the screen
	mBar1.resize(Mf::Rectangle(20, height - 51, 0.7 * width, height - 3));
	mBar2.resize(Mf::Rectangle(20, height - 28, 0.7 * width, height - 70));

	setBar1Progress(0.05);
	setBar2Progress(0.0);
}


void Hud::update(Mf::Scalar t, Mf::Scalar dt)
{
	mState.interp.update(t, dt);
	setBar1Progress(mState.interp.getState(dt));
	setBar2Progress(1.0 - mState.interp.getState(dt));
}

void Hud::draw(Mf::Scalar alpha) const
{
	glMatrixMode(GL_PROJECTION);
	glPushMatrix();
	glLoadMatrix(mProjection.data());

	glMatrixMode(GL_MODELVIEW);
	glPushMatrix();
	glLoadIdentity();

	glDisable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);

	mBar1.draw();
	mBar2.draw();

	glDisable(GL_BLEND);
	glEnable(GL_DEPTH_TEST);

	glMatrixMode(GL_PROJECTION);
	glPopMatrix();

	glMatrixMode(GL_MODELVIEW);
	glPopMatrix();
}

bool Hud::handleEvent(const Mf::Event& event)
{
	switch (event.type)
	{
		case SDL_KEYUP:
			if (event.key.keysym.sym == SDLK_h)
			{
				// don't want the hud anymore
				parent().removeChild(this);

				Mf::logWarning("okay bye bye hud");
				return true;
			}
			break;

		case SDL_VIDEORESIZE:
			resize(event.resize.w, event.resize.h);
			break;
	}

	return false;
}