#ifdef G_OS_WIN32
  #define WIN32_LEAN_AND_MEAN 1
  #include <windows.h>
#else
  #define FALSE 0
  #define TRUE !FALSE
  #define max(a, b)  (((a) > (b)) ? (a) : (b))

#endif

#include <string.h>

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

#include "button.h"
#include "font.h"


struct ButtonStruct ButtonCreate(int f_iXPos, int f_iYPos, int f_iWidth, int f_iHeight, char *f_pcTitle, int f_iType, int f_iGroup, int f_iId)
{
  struct ButtonStruct l_sButton;

  // copy parameters
  l_sButton.m_iXPos   = f_iXPos;
  l_sButton.m_iYPos   = f_iYPos;
  l_sButton.m_iType   = f_iType;
  l_sButton.m_iHeight = f_iHeight;
  l_sButton.m_iWidth  = f_iWidth;
  l_sButton.m_iGroup  = f_iGroup;
  l_sButton.m_iId     = f_iId;

  // copy title
  memset(&l_sButton.m_pcTitle, 0, sizeof(l_sButton.m_pcTitle));
  memcpy(l_sButton.m_pcTitle, f_pcTitle, strlen(f_pcTitle));

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

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

      BitmapConvertWidth(&l_sButton.m_psImgNormal[0], f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgNormal[1], f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgNormal[2], f_iHeight);

      BitmapConvertWidth(&l_sButton.m_psImgHover[0], f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgHover[1], f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgHover[2], f_iHeight);

      // calculate (center)width of image
      l_sButton.m_iCenterWidth = max(f_iWidth - l_sButton.m_psImgNormal[0].m_iWidth - l_sButton.m_psImgNormal[2].m_iWidth, 0);
      l_sButton.m_iWidth = l_sButton.m_iCenterWidth + l_sButton.m_psImgNormal[0].m_iWidth + l_sButton.m_psImgNormal[2].m_iWidth;
      break;

    case BUTTON_RADIO:
      l_sButton.m_psImgNormal[0]  = BitmapLoad("img/button_radio.bmp");
      l_sButton.m_psImgHover[0]   = BitmapLoad("img/button_radio_hover.bmp");
      l_sButton.m_psImgPressed[0] = BitmapLoad("img/button_radio_pressed.bmp");

      BitmapConvertWidth(&l_sButton.m_psImgNormal[0],  f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgHover[0],   f_iHeight);
      BitmapConvertWidth(&l_sButton.m_psImgPressed[0], f_iHeight);

      l_sButton.m_iCenterWidth = 0;
      l_sButton.m_iHeight = f_iHeight;
      l_sButton.m_iWidth  = f_iWidth;
      break;

    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];
  struct BitmapStruct *l_sImgButton;
  int    l_iImageIdLeft, l_iImageIdCenter, l_iImageIdRight;
  int    l_iLen, l_iXOffset, l_iYOffset, l_iWidth;
  struct ColorStruct l_sColor = {0, 0, 0};

  // copy button attributes
  int l_iCnWdt  = f_sButton->m_iCenterWidth;
  int l_iHeight = f_sButton->m_iHeight;
  int l_iXPos   = f_sButton->m_iXPos;
  int l_iYPos   = f_sButton->m_iYPos;

  if (f_sButton->m_bPressed)
  {
    glColor3d(0.8, 0.9, 1);
  }
  else
  {
    glColor3d(1, 1, 1);
  }

  // get the right image struct
  if (f_sButton->m_bHover)
  {
    l_sImgButton = f_sButton->m_psImgHover;
  }
  else
  {
    l_sImgButton = f_sButton->m_psImgNormal;
  }

  // copy buttom images
  l_iImageIdLeft   = l_sImgButton[0].m_iImageId;
  l_iImageIdCenter = l_sImgButton[1].m_iImageId;
  l_iImageIdRight  = l_sImgButton[2].m_iImageId;

  // copy button title
  memcpy(&l_pcTitle, f_sButton->m_pcTitle, strlen(f_sButton->m_pcTitle));

  // render left side of button
  l_iWidth   = l_sImgButton[0].m_iWidth;
  BitmapRender(l_iXPos,
               l_iYPos,
               l_iWidth + 1,
               l_iHeight,
               l_iImageIdLeft);

  // render right side of button
  l_iWidth = l_sImgButton[2].m_iWidth;
  BitmapRender(l_iXPos + l_iCnWdt + l_iWidth - 1,
               l_iYPos,
               l_iWidth,
               l_iHeight,
               l_iImageIdRight);

  // render center of button
  if (l_iCnWdt > 0)
  {
    BitmapRender(l_iXPos + l_iWidth - 1,
                 l_iYPos,
                 l_iCnWdt + 1,
                 l_iHeight,
                 l_iImageIdCenter);
  }

  l_iLen = (int)strlen(f_sButton->m_pcTitle);
  l_iXOffset = (int)(0.5 * f_sButton->m_iWidth - 0.5 * l_iLen * FONT_SPACING);
  l_iYOffset = (int)(0.5 * f_sButton->m_iHeight - 0.5 * FONT_HEIGHT);

  glPrint(f_sButton->m_iXPos + l_iXOffset,
          f_sButton->m_iYPos + l_iYOffset,
          f_sButton->m_pcTitle,
          l_sColor);

} // ButtonClickRender


void ButtonRadioRender(struct ButtonStruct *f_sButton)
{
  struct BitmapStruct *l_sImgButton;
  int l_iXOffset, l_iYOffset, l_iImageRadioId, l_iImageEnabledId;

  // copy button attributes
  int l_iWidth  = f_sButton->m_iWidth;
  int l_iHeight = f_sButton->m_iHeight;
  int l_iXPos   = f_sButton->m_iXPos;
  int l_iYPos   = f_sButton->m_iYPos;
  struct ColorStruct l_sColor = {0.2, 0.4, 0.8};

  // get the right image struct
  if (f_sButton->m_bHover)
  {
    l_sImgButton = f_sButton->m_psImgHover;
  }
  else
  {
    l_sImgButton = f_sButton->m_psImgNormal;
  }

  l_iImageRadioId   = l_sImgButton[0].m_iImageId;
  l_iImageEnabledId = f_sButton->m_psImgPressed[0].m_iImageId;

  glColor3d(1, 1, 1);

  // render the radio button
  BitmapRender(l_iXPos, l_iYPos, l_iWidth, l_iHeight, l_iImageRadioId);

  // render the enable-dot if button is pressed
  if (f_sButton->m_bPressed)
  {
    BitmapRender(l_iXPos, l_iYPos, l_iWidth, l_iHeight, l_iImageEnabledId);
  }

  l_iXOffset = (int)f_sButton->m_iWidth;
  l_iYOffset = (int)(0.5 * f_sButton->m_iHeight - 0.5 * FONT_HEIGHT);

  glPrint(f_sButton->m_iXPos + l_iXOffset,
          f_sButton->m_iYPos + l_iYOffset,
          f_sButton->m_pcTitle,
          l_sColor);

} // ButtonRadioRender


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:
      ButtonRadioRender(f_sButton);
        break;

    default:
      break;
  }

} // ButtonRender


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

} // ButtonHover


void ButtonExit(struct ButtonStruct *f_sButton)
{
  f_sButton->m_bHover = FALSE;

} // ButtonHover


void ButtonClickPress(struct ButtonStruct *f_sButton)
{
  if (!f_sButton->m_bPressed) {
    ButtonEnable(f_sButton);
  }

} // ButtonClickPress


void ButtonRadioPress(struct ButtonStruct *f_sButton)
{
  int i = 0;

  if (!f_sButton->m_bPressed)
  {
    ButtonEnable(f_sButton);
  }

} // ButtonClickPress


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

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

    case BUTTON_RADIO:
      ButtonRadioPress(f_sButton);
        break;

    default:
      break;
  }

} // ButtonPress


void ButtonClickRelease(struct ButtonStruct *f_sButton)
{
  ButtonDisable(f_sButton);

} // ButtonClickRelease


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

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

    case BUTTON_RADIO:
    default:
      break;
  }

} // ButtonRelease


void ButtonEnable(struct ButtonStruct *f_sButton)
{
  f_sButton->m_bPressed = TRUE;

} // ButtonEnable


void ButtonDisable(struct ButtonStruct *f_sButton)
{
  f_sButton->m_bPressed = FALSE;

} // ButtonDisable