/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* BWindow based framebuffer implementation */

#include <stdlib.h>
#include <string.h>

#include <stdio.h>
#include <unistd.h>

#include "SDL.h"
#include "SDL_BeApp.h"
#include "SDL_BWin.h"
#include "SDL_timer.h"
#include "blank_cursor.h"

extern "C" {

#include "SDL_sysvideo.h"
#include "SDL_sysmouse_c.h"
#include "SDL_sysevents_c.h"
#include "SDL_events_c.h"
#include "SDL_syswm_c.h"
#include "SDL_lowvideo.h"

#define BEOS_HIDDEN_SIZE	32	/* starting hidden window size */

/* Initialization/Query functions */
static int BE_VideoInit(_THIS, SDL_PixelFormat *vformat);
static SDL_Rect **BE_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags);
static SDL_Surface *BE_SetVideoMode(_THIS, SDL_Surface *current, int width, int height, int bpp, Uint32 flags);
static void BE_UpdateMouse(_THIS);
static int BE_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors);
static void BE_VideoQuit(_THIS);

/* Hardware surface functions */
static int BE_AllocHWSurface(_THIS, SDL_Surface *surface);
static int BE_LockHWSurface(_THIS, SDL_Surface *surface);
static void BE_UnlockHWSurface(_THIS, SDL_Surface *surface);
static void BE_FreeHWSurface(_THIS, SDL_Surface *surface);

static int BE_ToggleFullScreen(_THIS, int fullscreen);

/* OpenGL functions */
#ifdef HAVE_OPENGL
static void BE_GL_SwapBuffers(_THIS);
#endif

/* FB driver bootstrap functions */

static int BE_Available(void)
{
	return(1);
}

static void BE_DeleteDevice(SDL_VideoDevice *device)
{
	free(device->hidden);
	free(device);
}

static SDL_VideoDevice *BE_CreateDevice(int devindex)
{
	SDL_VideoDevice *device;

	/* Initialize all variables that we clean on shutdown */
	device = (SDL_VideoDevice *)malloc(sizeof(SDL_VideoDevice));
	if ( device ) {
		memset(device, 0, (sizeof *device));
		device->hidden = (struct SDL_PrivateVideoData *)
				malloc((sizeof *device->hidden));
	}
	if ( (device == NULL) || (device->hidden == NULL) ) {
		SDL_OutOfMemory();
		if ( device ) {
			free(device);
		}
		return(0);
	}
	memset(device->hidden, 0, (sizeof *device->hidden));

	/* Set the function pointers */
	device->VideoInit = BE_VideoInit;
	device->ListModes = BE_ListModes;
	device->SetVideoMode = BE_SetVideoMode;
	device->UpdateMouse = BE_UpdateMouse;
	device->SetColors = BE_SetColors;
	device->UpdateRects = NULL;
	device->VideoQuit = BE_VideoQuit;
	device->AllocHWSurface = BE_AllocHWSurface;
	device->CheckHWBlit = NULL;
	device->FillHWRect = NULL;
	device->SetHWColorKey = NULL;
	device->SetHWAlpha = NULL;
	device->LockHWSurface = BE_LockHWSurface;
	device->UnlockHWSurface = BE_UnlockHWSurface;
	device->FlipHWSurface = NULL;
	device->FreeHWSurface = BE_FreeHWSurface;
#ifdef HAVE_OPENGL
	device->GL_SwapBuffers = BE_GL_SwapBuffers;
#endif
	device->SetIcon = NULL;
	device->SetCaption = BE_SetWMCaption;
	device->GetWMInfo = NULL;
	device->FreeWMCursor = BE_FreeWMCursor;
	device->CreateWMCursor = BE_CreateWMCursor;
	device->ShowWMCursor = BE_ShowWMCursor;
	device->WarpWMCursor = BE_WarpWMCursor;
	device->InitOSKeymap = BE_InitOSKeymap;
	device->PumpEvents = BE_PumpEvents;

	device->free = BE_DeleteDevice;
	device->ToggleFullScreen = BE_ToggleFullScreen;

	/* Set the driver flags */
	device->handles_any_size = 1;
	
	return device;
}

VideoBootStrap BWINDOW_bootstrap = {
	"bwindow", "BDirectWindow graphics",
	BE_Available, BE_CreateDevice
};

static inline int ColorSpaceToBitsPerPixel(uint32 colorspace)
{
	int bitsperpixel;

	bitsperpixel = 0;
	switch (colorspace) {
	    case B_CMAP8:
		bitsperpixel = 8;
		break;
	    case B_RGB15:
	    case B_RGBA15:
	    case B_RGB15_BIG:
	    case B_RGBA15_BIG:
		bitsperpixel = 15;
		break;
	    case B_RGB16:
	    case B_RGB16_BIG:
		bitsperpixel = 16;
		break;
	    case B_RGB32:
	    case B_RGBA32:
	    case B_RGB32_BIG:
	    case B_RGBA32_BIG:
		bitsperpixel = 32;
		break;
	    default:
		break;
	}
	return(bitsperpixel);
}

/* Function to sort the display_list in bscreen */
static int CompareModes(const void *A, const void *B)
{
	const display_mode *a = (display_mode *)A;
	const display_mode *b = (display_mode *)B;

	if ( a->space == b->space ) {
		return((b->virtual_width*b->virtual_height)-
		       (a->virtual_width*a->virtual_height));
	} else {
		return(ColorSpaceToBitsPerPixel(b->space)-
		       ColorSpaceToBitsPerPixel(a->space));
	}
}

/* Yes, this isn't the fastest it could be, but it works nicely */
static int BE_AddMode(_THIS, int index, unsigned int w, unsigned int h)
{
	SDL_Rect *mode;
	int i;
	int next_mode;

	/* Check to see if we already have this mode */
	if ( SDL_nummodes[index] > 0 ) {
		for ( i=SDL_nummodes[index]-1; i >= 0; --i ) {
			mode = SDL_modelist[index][i];
			if ( (mode->w == w) && (mode->h == h) ) {
#ifdef BWINDOW_DEBUG
				fprintf(stderr, "We already have mode %dx%d at %d bytes per pixel\n", w, h, index+1);
#endif
				return(0);
			}
		}
	}

	/* Set up the new video mode rectangle */
	mode = (SDL_Rect *)malloc(sizeof *mode);
	if ( mode == NULL ) {
		SDL_OutOfMemory();
		return(-1);
	}
	mode->x = 0;
	mode->y = 0;
	mode->w = w;
	mode->h = h;
#ifdef BWINDOW_DEBUG
	fprintf(stderr, "Adding mode %dx%d at %d bytes per pixel\n", w, h, index+1);
#endif

	/* Allocate the new list of modes, and fill in the new mode */
	next_mode = SDL_nummodes[index];
	SDL_modelist[index] = (SDL_Rect **)
	       realloc(SDL_modelist[index], (1+next_mode+1)*sizeof(SDL_Rect *));
	if ( SDL_modelist[index] == NULL ) {
		SDL_OutOfMemory();
		SDL_nummodes[index] = 0;
		free(mode);
		return(-1);
	}
	SDL_modelist[index][next_mode] = mode;
	SDL_modelist[index][next_mode+1] = NULL;
	SDL_nummodes[index]++;

	return(0);
}

int BE_VideoInit(_THIS, SDL_PixelFormat *vformat)
{
	display_mode *modes;
	uint32 i, nmodes;
	int bpp;
	BRect bounds;

	/* Initialize the Be Application for appserver interaction */
	if ( SDL_InitBeApp() < 0 ) {
		return(-1);
	}

	/* It is important that this be created after SDL_InitBeApp() */
	BScreen bscreen;

	/* Save the current display mode */
	bscreen.GetMode(&saved_mode);

	/* Determine the screen depth */
	vformat->BitsPerPixel = ColorSpaceToBitsPerPixel(bscreen.ColorSpace());
	if ( vformat->BitsPerPixel == 0 ) {
		SDL_SetError("Unknown BScreen colorspace: 0x%x",
						bscreen.ColorSpace());
		return(-1);
	}

	/* Get the video modes we can switch to in fullscreen mode */
	bscreen.GetModeList(&modes, &nmodes);
	qsort(modes, nmodes, sizeof *modes, CompareModes);
	for ( i=0; i<nmodes; ++i ) {
		bpp = ColorSpaceToBitsPerPixel(modes[i].space);
		//if ( bpp != 0 ) { // There are bugs in changing colorspace
		if ( modes[i].space == saved_mode.space ) {
			BE_AddMode(_this, ((bpp+7)/8)-1,
				modes[i].virtual_width,
				modes[i].virtual_height);
		}
	}

	/* Create the window and view */
	bounds.top = 0; bounds.left = 0;
	bounds.right = BEOS_HIDDEN_SIZE;
	bounds.bottom = BEOS_HIDDEN_SIZE;
	SDL_Win = new SDL_BWin(bounds);

	/* Create the clear cursor */
	SDL_BlankCursor = BE_CreateWMCursor(_this, blank_cdata, blank_cmask,
			BLANK_CWIDTH, BLANK_CHEIGHT, BLANK_CHOTX, BLANK_CHOTY);

	/* Fill in some window manager capabilities */
	_this->info.wm_available = 1;

	/* We're done! */
	return(0);
}

/* We support any dimension at our bit-depth */
SDL_Rect **BE_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
	SDL_Rect **modes;

	modes = ((SDL_Rect **)0);
	if ( (flags & SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
		modes = SDL_modelist[((format->BitsPerPixel+7)/8)-1];
	} else {
		if ( format->BitsPerPixel ==
			_this->screen->format->BitsPerPixel ) {
			modes = ((SDL_Rect **)-1);
		}
	}
	return(modes);
}

/* Various screen update functions available */
static void BE_NormalUpdate(_THIS, int numrects, SDL_Rect *rects);


/* Find the closest display mode for fullscreen */
static bool BE_FindClosestFSMode(_THIS, int width, int height, int bpp,
					 display_mode *mode)
{
	BScreen bscreen;
	uint32 i, nmodes;
	SDL_Rect **modes;
	display_mode *dmodes;

	modes = SDL_modelist[((bpp+7)/8)-1];
	for ( i=0; modes[i] && (modes[i]->w > width) &&
		      (modes[i]->h > height); ++i ) {
		/* still looking */
	}
	if ( ! modes[i] || (modes[i]->w < width) || (modes[i]->h < width) ) {
		--i;	/* We went too far */
	}
	width = modes[i]->w;
	height = modes[i]->h;      
	bscreen.GetModeList(&dmodes, &nmodes);
	for ( i = 0; i < nmodes; ++i ) {
		if ( (bpp == ColorSpaceToBitsPerPixel(dmodes[i].space)) &&
		     (width == dmodes[i].virtual_width) &&
		     (height == dmodes[i].virtual_height) ) {
			break;
		}
	}
	if ( i != nmodes ) {
		*mode = dmodes[i];
		return true;
	} else {
		return false;
	}	
}

static int BE_SetFullScreen(_THIS, SDL_Surface *screen, int fullscreen)
{
	int was_fullscreen;
	bool needs_unlock;
	BScreen bscreen;
	BRect bounds;
	display_mode mode;
	int width, height, bpp;

	/* Set the fullscreen mode */
	was_fullscreen = SDL_Win->IsFullScreen();
	SDL_Win->SetFullScreen(fullscreen);
	fullscreen = SDL_Win->IsFullScreen();

	width = screen->w;
	height = screen->h;

	/* Set the appropriate video mode */
	if ( fullscreen ) {
		bpp = screen->format->BitsPerPixel;
		bscreen.GetMode(&mode);
		if ( (bpp != ColorSpaceToBitsPerPixel(mode.space)) ||
		     (width != mode.virtual_width) ||
		     (height != mode.virtual_height)) {
			if(BE_FindClosestFSMode(_this, width, height, bpp, &mode)) {
				bscreen.SetMode(&mode);
				/* This simply stops the next resize event from being
				 * sent to the SDL handler.
				 */
				SDL_Win->InhibitResize();
			} else {
				fullscreen = 0;
				SDL_Win->SetFullScreen(fullscreen);
			}
		}
	}
	if ( was_fullscreen && ! fullscreen ) {
		bscreen.SetMode(&saved_mode);
	}

	if ( SDL_Win->Lock() ) {
		int xoff, yoff;
		if ( SDL_Win->Shown() ) {
			needs_unlock = 1;
			SDL_Win->Hide();
		} else {
			needs_unlock = 0;
		}
		/* This resizes the window and view area, but inhibits resizing
		 * of the BBitmap due to the InhibitResize call above. Thus the
		 * bitmap (pixel data) never changes.
		 */
		SDL_Win->ResizeTo(width, height);
		bounds = bscreen.Frame();
		/* Calculate offsets - used either to center window
		 * (windowed mode) or to set drawing offsets (fullscreen mode)
		 */
		xoff = (bounds.IntegerWidth() - width)/2;
		yoff = (bounds.IntegerHeight() - height)/2;
		if ( fullscreen ) {
			/* Set offset for drawing */
			SDL_Win->SetXYOffset(xoff, yoff);
		} else {
			/* Center window and reset the drawing offset */
			SDL_Win->SetXYOffset(0, 0);
		}
		if ( ! needs_unlock || was_fullscreen ) {
			/* Center the window the first time */
			SDL_Win->MoveTo(xoff > 0 ? (float)xoff : 0.0f,
					yoff > 0 ? (float)yoff : 0.0f);
		}
		SDL_Win->Show();
		
		/* Unlock the window manually after the first Show() */
		if ( needs_unlock ) {
			SDL_Win->Unlock();
		}
	}

	/* Set the fullscreen flag in the screen surface */
	if ( fullscreen ) {
		screen->flags |= SDL_FULLSCREEN;
	} else {
		screen->flags &= ~SDL_FULLSCREEN; 
	}
	return(1);
}

static int BE_ToggleFullScreen(_THIS, int fullscreen)
{
	return BE_SetFullScreen(_this, _this->screen, fullscreen);
}

/* FIXME: check return values and cleanup here */
SDL_Surface *BE_SetVideoMode(_THIS, SDL_Surface *current,
				int width, int height, int bpp, Uint32 flags)
{
	BScreen bscreen;
	BBitmap *bbitmap;
	BRect bounds;

	/* Create the view for this window */
	if ( SDL_Win->CreateView(flags) < 0 ) {
		return(NULL);
	}

	current->flags = 0;		/* Clear flags */
	current->w = width;
	current->h = height;
	SDL_Win->SetType(B_TITLED_WINDOW);
	if ( flags & SDL_NOFRAME ) {
		current->flags |= SDL_NOFRAME;
		SDL_Win->SetLook(B_NO_BORDER_WINDOW_LOOK);
	} else {
		if ( (flags & SDL_RESIZABLE) && !(flags & SDL_OPENGL) )  {
			current->flags |= SDL_RESIZABLE;
			/* We don't want opaque resizing (TM). :-) */
			SDL_Win->SetFlags(B_OUTLINE_RESIZE);
		} else {
			SDL_Win->SetFlags(B_NOT_RESIZABLE|B_NOT_ZOOMABLE);
		}
	}

	if ( flags & SDL_OPENGL ) {
		current->flags |= SDL_OPENGL;
		current->pitch = 0;
		current->pixels = NULL;
		_this->UpdateRects = NULL;		
	} else {
		/* Create the BBitmap framebuffer */
		bounds.top = 0; bounds.left = 0;
		bounds.right = width-1;
		bounds.bottom = height-1;
		bbitmap = new BBitmap(bounds, bscreen.ColorSpace());
		if ( ! bbitmap->IsValid() ) {
			SDL_SetError("Couldn't create screen bitmap");
			delete bbitmap;
			return(NULL);
		}
		current->pitch = bbitmap->BytesPerRow();
		current->pixels = (void *)bbitmap->Bits();
		SDL_Win->SetBitmap(bbitmap);
		_this->UpdateRects = BE_NormalUpdate;
	}

	/* Set the correct fullscreen mode */
	BE_SetFullScreen(_this, current, flags & SDL_FULLSCREEN ? 1 : 0);

	/* We're done */
	return(current);
}

/* Update the current mouse state and position */
void BE_UpdateMouse(_THIS)
{
	BPoint point;
	uint32 buttons;

	if ( SDL_Win->Lock() ) {
		/* Get new input state, if still active */
		if ( SDL_Win->IsActive() ) {
			(SDL_Win->View())->GetMouse(&point, &buttons, true);
		} else {
			point.x = -1;
			point.y = -1;
		}
		SDL_Win->Unlock();

		if ( (point.x >= 0) && (point.x < SDL_VideoSurface->w) &&
		     (point.y >= 0) && (point.y < SDL_VideoSurface->h) ) {
			SDL_PrivateAppActive(1, SDL_APPMOUSEFOCUS);
			SDL_PrivateMouseMotion(0, 0,
					(Sint16)point.x, (Sint16)point.y);
		} else {
			SDL_PrivateAppActive(0, SDL_APPMOUSEFOCUS);
		}
	}
}

/* We don't actually allow hardware surfaces other than the main one */
static int BE_AllocHWSurface(_THIS, SDL_Surface *surface)
{
	return(-1);
}
static void BE_FreeHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}
static int BE_LockHWSurface(_THIS, SDL_Surface *surface)
{
	return(0);
}
static void BE_UnlockHWSurface(_THIS, SDL_Surface *surface)
{
	return;
}

static void BE_NormalUpdate(_THIS, int numrects, SDL_Rect *rects)
{
	if ( SDL_Win->BeginDraw() ) {
		int i;

		for ( i=0; i<numrects; ++i ) {
			BRect rect;

			rect.top = rects[i].y;
			rect.left = rects[i].x;
			rect.bottom = rect.top+rects[i].h-1;
			rect.right = rect.left+rects[i].w-1;
			SDL_Win->DrawAsync(rect);
		}
		SDL_Win->EndDraw();
	}
}

#ifdef HAVE_OPENGL
void BE_GL_SwapBuffers(_THIS)
{
	SDL_Win->SwapBuffers();
}
#endif

/* Is the system palette settable? */
int BE_SetColors(_THIS, int firstcolor, int ncolors, SDL_Color *colors)
{
	int i;
	SDL_Palette *palette;
	const color_map *cmap = BScreen().ColorMap();

	/* Get the screen colormap */
	palette = _this->screen->format->palette;
	for ( i=0; i<256; ++i ) {
		palette->colors[i].r = cmap->color_list[i].red;
		palette->colors[i].g = cmap->color_list[i].green;
		palette->colors[i].b = cmap->color_list[i].blue;
	}
	return(0);
}

void BE_VideoQuit(_THIS)
{
	int i, j;

	if ( SDL_BlankCursor != NULL ) {
		BE_FreeWMCursor(_this, SDL_BlankCursor);
		SDL_BlankCursor = NULL;
	}
	for ( i=0; i<NUM_MODELISTS; ++i ) {
		if ( SDL_modelist[i] ) {
			for ( j=0; SDL_modelist[i][j]; ++j ) {
				free(SDL_modelist[i][j]);
			}
			free(SDL_modelist[i]);
			SDL_modelist[i] = NULL;
		}
	}
	/* Restore the original video mode */
	if ( _this->screen ) {
		if ( (_this->screen->flags&SDL_FULLSCREEN) == SDL_FULLSCREEN ) {
			BScreen bscreen;
			bscreen.SetMode(&saved_mode);
		}
		_this->screen->pixels = NULL;
	}
	SDL_QuitBeApp();
}

}; /* Extern C */