#ifdef G_OS_WIN32
  #define WIN32_LEAN_AND_MEAN 1
  #include <windows.h>
#endif

#include <GL/gl.h>
#include <string.h>
#include <stdio.h>

#include "button.h"



struct ButtonStruct ButtonCreate(double f_dXPos, double f_dYPos, double f_dWidth, char *f_pcTitle, int f_iType)
{
  struct ButtonStruct l_sButton;

  // copy parameters
  l_sButton.m_dXPos  = f_dXPos;
  l_sButton.m_dYPos  = f_dYPos;
  l_sButton.m_iType  = f_iType;
  l_sButton.m_dWidth = f_dWidth;

  // copy title
  memcpy(l_sButton.m_pcTitle, f_pcTitle, sizeof(f_pcTitle));

  switch (f_iType)
  {
    case BUTTON_CLICK:
      l_sButton.m_piImgNormal[0] = BitmapLoad("img/button_click_left.bmp");
      l_sButton.m_piImgNormal[1] = BitmapLoad("img/button_click_center.bmp");
      l_sButton.m_piImgNormal[2] = BitmapLoad("img/button_click_right.bmp");

      l_sButton.m_piImgPressed[0] = BitmapLoad("img/button_click_left_hover.bmp");
      l_sButton.m_piImgPressed[1] = BitmapLoad("img/button_click_center_hover.bmp");
      l_sButton.m_piImgPressed[2] = BitmapLoad("img/button_click_right_hover.bmp");

      // calculate width of center image
      l_sButton.m_dCenterWidth = f_dWidth - l_sButton.m_piImgNormal[0].m_iWidth - l_sButton.m_piImgNormal[2].m_iWidth;

      // retrieve image height
      l_sButton.m_dHeight = l_sButton.m_piImgNormal[0].m_iHeight;
      break;

    case BUTTON_RADIO:
    case BUTTON_LABEL:
    default:
      break;
  }

  l_sButton.m_bPressed = FALSE;
  l_sButton.m_bHover   = FALSE;

  return l_sButton;

} // ButtonCreate



void ButtonClickRender(struct ButtonStruct *f_sButton)
{
  char l_pcTitle[BUTTON_MAX_TITLE];

  // copy button attributes
  double l_dWidth = f_sButton->m_dCenterWidth;
  double l_dXPos  = f_sButton->m_dXPos;
  double l_dYPos  = f_sButton->m_dYPos;
  int    l_iType  = f_sButton->m_iType;

  // copy buttom images
  int l_iImageIdLeft   = (!f_sButton->m_bHover) ? f_sButton->m_piImgNormal[0].m_iImageId : f_sButton->m_piImgPressed[0].m_iImageId;
  int l_iImageIdCenter = (!f_sButton->m_bHover) ? f_sButton->m_piImgNormal[1].m_iImageId : f_sButton->m_piImgPressed[1].m_iImageId;
  int l_iImageIdRight  = (!f_sButton->m_bHover) ? f_sButton->m_piImgNormal[2].m_iImageId : f_sButton->m_piImgPressed[2].m_iImageId;

  // copy button title
  memset(&l_pcTitle, 0, sizeof(l_pcTitle));
  memcpy(&l_pcTitle, f_sButton->m_pcTitle, sizeof(f_sButton->m_pcTitle));

  // render left side of button
  glBindTexture(GL_TEXTURE_2D, l_iImageIdLeft);

  glBegin(GL_QUADS);
    glTexCoord3d(0, 1, 0); glVertex3d(l_dXPos,      l_dYPos,                       0);
    glTexCoord3d(1, 1, 0); glVertex3d(l_dXPos + 26, l_dYPos,                       0);
    glTexCoord3d(1, 0, 0); glVertex3d(l_dXPos + 26, l_dYPos + BUTTON_CLICK_HEIGHT, 0);
    glTexCoord3d(0, 0, 0); glVertex3d(l_dXPos,      l_dYPos + BUTTON_CLICK_HEIGHT, 0);
  glEnd();

  // render right side of button
  glBindTexture(GL_TEXTURE_2D, l_iImageIdRight);

  glBegin(GL_QUADS);
    glTexCoord3d(0, 1, 0); glVertex3d(l_dXPos + 24 + l_dWidth,      l_dYPos,                       0);
    glTexCoord3d(1, 1, 0); glVertex3d(l_dXPos + 24 + l_dWidth + 25, l_dYPos,                       0);
    glTexCoord3d(1, 0, 0); glVertex3d(l_dXPos + 24 + l_dWidth + 25, l_dYPos + BUTTON_CLICK_HEIGHT, 0);
    glTexCoord3d(0, 0, 0); glVertex3d(l_dXPos + 24 + l_dWidth,      l_dYPos + BUTTON_CLICK_HEIGHT, 0);
  glEnd();

  // render center of button
  if (l_dWidth > 0)
  {
    glBindTexture(GL_TEXTURE_2D, l_iImageIdCenter);

    glBegin(GL_QUADS);
      glTexCoord3d(0, 1, 0); glVertex3d(l_dXPos + 25,            l_dYPos,                       0);
      glTexCoord3d(1, 1, 0); glVertex3d(l_dXPos + 25 + l_dWidth, l_dYPos,                       0);
      glTexCoord3d(1, 0, 0); glVertex3d(l_dXPos + 25 + l_dWidth, l_dYPos + BUTTON_CLICK_HEIGHT, 0);
      glTexCoord3d(0, 0, 0); glVertex3d(l_dXPos + 25,            l_dYPos + BUTTON_CLICK_HEIGHT, 0);
    glEnd();
  }

} // ButtonClickRender



void ButtonRender(struct ButtonStruct *f_sButton)
{
  int l_iType = f_sButton->m_iType;

  switch (l_iType)
  {
    case BUTTON_CLICK:
      ButtonClickRender(f_sButton);
      break;

    case BUTTON_RADIO:
    case BUTTON_LABEL:
    default:
      break;
  }

} // ButtonRender



void ButtonHover(struct ButtonStruct *f_sButton)
{
  f_sButton->m_bHover = TRUE;

} // ButtonHover