#include "WindowManager.h"

void TransWindow(WindowRef w, Boolean vis)
{
	WindowTransitionAction Action;
	if(vis)
		Action = kWindowShowTransitionAction;
	else
		Action = kWindowHideTransitionAction;
	TransitionWindow(w, kWindowZoomTransitionEffect, Action, NULL);
}

#pragma mark -

void SetOrtho(VWindow * w)
{
	Rect bounds;
	bounds = WindowSize(w);
	
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	w->Ortho = true;
	glDisable(GL_DEPTH_TEST);
	glOrtho(0, bounds.right-bounds.left, 0, bounds.bottom-bounds.top, 0, 20);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

void SetPerspective(VWindow * w)
{
	Rect bounds;
	GLfloat ratio;
	
	bounds = WindowSize(w);
	
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	
	if ((bounds.right - bounds.left) > (bounds.bottom - bounds.top)) {
		ratio = ((GLfloat) (bounds.right - bounds.left) / (bounds.bottom - bounds.top));
		glFrustum(-ratio, ratio, -1.0, 1.0, 1.5, 10000.0);
	} else
	{
		ratio = ((GLfloat) (bounds.bottom - bounds.top) / (bounds.right - bounds.left));
		glFrustum(-1.0, 1.0, -ratio, ratio, 1.5, 10000.0);
	}
	
	glScalef(10.0, 10.0, 10.0);
	
	w->Ortho = false;
	glEnable(GL_DEPTH_TEST);
	
	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();
}

static void SetOGLSetttings(VWindow * w)
{
	glLineWidth(1.0);
	glEnable(GL_DEPTH_TEST);
	glEnable(GL_BLEND);
	glEnable(GL_ALPHA_TEST);
	glEnable(GL_POLYGON_OFFSET_FILL);
	glAlphaFunc(GL_GREATER, 0.0f);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); /* Wireframe mode */
	if(w->Ortho)
		SetOrtho(w);
	else
		SetPerspective(w);
}

Rect WindowSize(VWindow * w)
{
	Rect result;
	GDHandle Display;
	
	if(w->FullScreen)
	{
		Display = GetMainDevice();
		return (**Display).gdRect;
	}
	else
	{
		GetWindowPortBounds(w->TheWindow, &result);
		return result;
	}
}

void CreateWindowedContext(VWindow * w)
{
	GLint Attribs[] = {AGL_RGBA, AGL_DOUBLEBUFFER, AGL_DEPTH_SIZE, 24, 
		AGL_NO_RECOVERY, AGL_ACCELERATED, AGL_PIXEL_SIZE, 32, AGL_NONE};
	AGLPixelFormat Format;
	Rect windowBounds;
	
	Format = aglChoosePixelFormat(NULL, 0, Attribs);
	w->Windowed = aglCreateContext(Format, w->FullScreen);
	
	if(w->FullScreen)
	{
	  glClear(GL_COLOR_BUFFER_BIT);
  	aglSwapBuffers(w->FullScreen);
  	
		aglSetCurrentContext(NULL);
		aglSetDrawable(w->FullScreen, NULL);
		aglDestroyContext(w->FullScreen);
		w->FullScreen = NULL;
	}
	
	aglSetDrawable(w->Windowed, GetWindowPort(w->TheWindow));
	aglSetCurrentContext(w->Windowed);
	aglDestroyPixelFormat(Format);
	
	GetWindowPortBounds(w->TheWindow, &windowBounds);
	w->IsFullScreen = false;
	SetOGLSetttings(w);
	
	glClear(GL_COLOR_BUFFER_BIT);
	
	if(aglGetError())
		SysBeep(0);
}

void CreateFullScreenContext(VWindow * w)
{
	GLint Attribs[] = {AGL_RGBA, AGL_DOUBLEBUFFER, AGL_DEPTH_SIZE, 24, 
		AGL_FULLSCREEN, AGL_NO_RECOVERY, AGL_ACCELERATED, AGL_PIXEL_SIZE, 32, AGL_NONE};
	AGLPixelFormat Format;
	GDHandle Display;
	
	Display = GetMainDevice();
	Format = aglChoosePixelFormat(&Display, 1, Attribs);
	w->FullScreen = aglCreateContext(Format, w->Windowed);
	
	if(w->Windowed)
	{
	  glClear(GL_COLOR_BUFFER_BIT);
  	aglSwapBuffers(w->Windowed);
  	
		aglSetCurrentContext(NULL);
		aglSetDrawable(w->Windowed, NULL);
		aglDestroyContext(w->Windowed);
		w->Windowed = NULL;
	}
	
	aglSetFullScreen(w->FullScreen, (**Display).gdRect.right, (**Display).gdRect.bottom, 0, 0);
	aglSetCurrentContext(w->FullScreen);
	aglDestroyPixelFormat(Format);
	
	w->IsFullScreen = true;
	SetOGLSetttings(w);
	
	glClear(GL_COLOR_BUFFER_BIT);
	
	if(aglGetError())
		SysBeep(0);
}

static void InitWindowContext(VWindow * w)
{
	w->FullScreen = NULL;
	w->Windowed = NULL;
	w->Ortho = false;
	w->Scaled = false;
	CreateWindowedContext(w);
}

#pragma mark -

static pascal OSStatus WindowWasClosed(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
	#pragma unused(nextEvent, theEvent)
	VWindow * w;
	
	w = (VWindow *) userData;
	if (w->quitOnClose) QuitApplicationEventLoop();
	return eventNotHandledErr;
}

static pascal OSStatus WindowCollapsing(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
  #pragma unused(nextEvent, theEvent)
  VWindow * w;
  
  w = (VWindow *) userData;
  w->isMinimized = 1;
  if (!w->IsFullScreen && w->Windowed != NULL) {
    PixMapHandle myPixMap;
    Rect windowBounds;
    void * imageData;
    GWorldPtr origGWorld;
    GDHandle origGDev;
    short currentRow;
    Rect srcRect, destRect;
    
    GetWindowPortBounds(w->TheWindow, &windowBounds);
    OffsetRect(&windowBounds, -windowBounds.left, -windowBounds.top);
    myPixMap = NewPixMap();
    if (myPixMap == NULL) return eventNotHandledErr;
    imageData = NewPtr(4 * windowBounds.right * windowBounds.bottom);
    if (imageData == NULL) {
      DisposePixMap(myPixMap);
      return eventNotHandledErr;
    }
    
    glReadPixels(0, 0, windowBounds.right, windowBounds.bottom, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, imageData);
    
    (**myPixMap).baseAddr = imageData;
    (**myPixMap).rowBytes = ((windowBounds.right * 4) | (1 << 15));
    (**myPixMap).bounds = windowBounds;
    (**myPixMap).pmVersion = 0;
    (**myPixMap).packType = 0;
    (**myPixMap).packSize = 0;
    (**myPixMap).hRes = (72 << 16); /* hRes is a Fixed */
    (**myPixMap).vRes = (72 << 16); /* vRes is a Fixed */
    (**myPixMap).pixelType = RGBDirect;
    (**myPixMap).pixelSize = 32;
    (**myPixMap).cmpCount = 3; /* RGB, ignore Alpha */
    (**myPixMap).cmpSize = 8;
    (**myPixMap).pixelFormat = 0;
    (**myPixMap).pmExt = 0;
    (**myPixMap).pmTable = GetCTable(72); /* Unnecessary? */
    
    GetGWorld(&origGWorld, &origGDev);
    SetPortWindowPort(w->TheWindow);
    srcRect = destRect = windowBounds;
    
    /* Since glReadPixels will give us an upside-down image, copy one row at a time.
       Not the most efficient way to do it, but it works well enough. */
    for (currentRow = 0; currentRow < windowBounds.bottom; currentRow++) {
      srcRect.bottom = (windowBounds.bottom - currentRow);
      srcRect.top = (srcRect.bottom - 1);
      destRect.top = currentRow;
      destRect.bottom = (currentRow + 1);
      CopyBits((BitMap *) *myPixMap, GetPortBitMapForCopyBits(GetWindowPort(w->TheWindow)), &srcRect, &destRect, srcCopy, NULL);
    }
    /* Make sure the image shows up */
    QDFlushPortBuffer(GetWindowPort(w->TheWindow), NULL);
    SetGWorld(origGWorld, origGDev);
    
    DisposePixMap(myPixMap);
    DisposePtr(imageData);
  }
  return eventNotHandledErr;
}

static pascal OSStatus WindowExpanding(EventHandlerCallRef nextEvent, EventRef theEvent, void * userData) {
  #pragma unused(nextEvent, theEvent)
  VWindow * w;
  
  w = (VWindow *) userData;
  w->isMinimized = 0;
  return eventNotHandledErr;
}

void InitWindow(VWindow * w)
{
	GDHandle mainDevice;
	Point screenSize;
	Rect Bounds;
	EventTypeSpec eventType;
	
	mainDevice = GetMainDevice();
	screenSize.h = (**mainDevice).gdRect.right;
	screenSize.v = (**mainDevice).gdRect.bottom;
	
	/* This will center the window onscreen. */
	SetRect(&Bounds, ((screenSize.h / 2) - WINDOWH/2), ((screenSize.v / 2) - WINDOWV/2),
		((screenSize.h / 2) + WINDOWH/2), ((screenSize.v / 2) + WINDOWV/2));
	CreateNewWindow(kDocumentWindowClass, 
		kWindowCloseBoxAttribute + kWindowCollapseBoxAttribute, 
		&Bounds, &w->TheWindow);
	SetWindowTitleWithCFString(w->TheWindow, CFSTR("Vectorized"));
	
	InstallStandardEventHandler(GetWindowEventTarget(w->TheWindow));
	
	eventType.eventClass = kEventClassWindow;
	eventType.eventKind = kEventWindowClosed;
	InstallWindowEventHandler(w->TheWindow, NewEventHandlerUPP(WindowWasClosed), 1, &eventType, w, NULL);
	
	eventType.eventClass = kEventClassWindow;
	eventType.eventKind = kEventWindowCollapsing;
	InstallWindowEventHandler(w->TheWindow, NewEventHandlerUPP(WindowCollapsing), 1, &eventType, w, NULL);
	
	eventType.eventClass = kEventClassWindow;
	eventType.eventKind = kEventWindowExpanding;
	InstallWindowEventHandler(w->TheWindow, NewEventHandlerUPP(WindowExpanding), 1, &eventType, w, NULL);
	
	TransWindow(w->TheWindow, true);
	
	InitWindowContext(w);
	
	w->quitOnClose = 0;
	
	w->isMinimized = 0;
}

void CleanUpWindow(VWindow * w)
{
	TransWindow(w->TheWindow, false);
	
	if(w->FullScreen)
	{
		aglSetCurrentContext(NULL);
		aglSetDrawable(w->FullScreen, NULL);
		aglDestroyContext(w->FullScreen);
		w->FullScreen = NULL;
	}
	if(w->Windowed)
	{
		aglSetCurrentContext(NULL);
		aglSetDrawable(w->Windowed, NULL);
		aglDestroyContext(w->Windowed);
		w->Windowed = NULL;
	}
	
	DisposeWindow(w->TheWindow);
	w->TheWindow = NULL;
}