/*
  Copyright 2013 Peter Nelson

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <pugl/pugl.h>
#include "pui.h"

static const float button_coords[][4] = {
	{      0,   .75f,   .25f,      1 }, /// Raised small button
	{   .25f,   .75f,    .5f,      1 }, /// Lowered small button

	{      0,      0,   .25f,  .375f }, /// Raised large button left
	{   .25f,      0,    .5f,  .375f }, /// Raised large button middle
	{   .75f,      0,      1,  .375f }, /// Raised large button right

	{      0,  .375f,   .25f,   .75f }, /// Lowered large button left
	{   .25f,  .375f,    .5f,   .75f }, /// Lowered large button middle
	{   .75f,  .375f,      1,   .75f }, /// Lowered large button right
};

enum ButtonPart {
	BP_RSMALL,
	BP_LSMALL,

	BP_RL_LEFT,
	BP_RL_MIDDLE,
	BP_RL_RIGHT,

	BP_LL_LEFT,
	BP_LL_MIDDLE,
	BP_LL_RIGHT,
};

SmallButton::SmallButton()
{
	this->min = 0;
	this->max = 1;

	/* Fixed size as we've no access to textures here */
	this->w = 32;
	this->h = 32;
}

LargeButton::LargeButton()
{
	this->min = 0;
	this->max = 1;

	/* Fixed size as we've no access to textures here */
	this->w = -1;
	this->h = 48;
}

static void button_rect(ButtonPart part, int x1, int y1, int x2, int y2)
{
	const float *p = button_coords[part];
	glTexCoord2f(p[0], p[1]);
	glVertex2f(x1, y1);
	glTexCoord2f(p[0], p[3]);
	glVertex2f(x1, y2);
	glTexCoord2f(p[2], p[3]);
	glVertex2f(x2, y2);
	glTexCoord2f(p[2], p[1]);
	glVertex2f(x2, y1);
}

void SmallButton::OnPaint(const PUi *pui) const
{
	glEnable(GL_TEXTURE_2D);

	GLuint t = TEX_BUTTONS;
	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	if (colour.a) glColor4f(colour.r, colour.g, colour.b, colour.a);
	else glColor4f(1, 1, 1, 1);
	button_rect(this->value ? BP_LSMALL : BP_RSMALL, x, y, x + 32, y + 32);
	glEnd();

	glDisable(GL_TEXTURE_2D);

	Widget::OnPaint(pui);
}


void LargeButton::OnPaint(const PUi *pui) const
{
	glEnable(GL_TEXTURE_2D);

	GLuint t = TEX_BUTTONS;
	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	if (colour.a) glColor4f(colour.r, colour.g, colour.b, colour.a);
	else glColor4f(1, 1, 1, 1);

	if (w <= 64) {
		float w2 = w * .5f;
		button_rect(this->value ? BP_LL_LEFT   : BP_RL_LEFT,  x,           y, x + w2, y + 48);
		button_rect(this->value ? BP_LL_RIGHT  : BP_RL_RIGHT, x + w2 - 32,  y, x + w, y + 48);
	} else {
		button_rect(this->value ? BP_LL_LEFT   : BP_RL_LEFT,   x,          y, x + 32,     y + 48);
		button_rect(this->value ? BP_LL_MIDDLE : BP_RL_MIDDLE, x + 32,     y, x + w - 32, y + 48);
		button_rect(this->value ? BP_LL_RIGHT  : BP_RL_RIGHT,  x + w - 32, y, x + w,      y + 48);
	}
	glEnd();

	glDisable(GL_TEXTURE_2D);

	Widget::OnPaint(pui);
}