/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#include "SDL_ph_modes_c.h"

static PgVideoModeInfo_t mode_info;
static PgVideoModes_t mode_list;

/* The current list of available video modes */
SDL_Rect  SDL_modelist[PH_MAX_VIDEOMODES];
SDL_Rect* SDL_modearray[PH_MAX_VIDEOMODES];

static int compare_modes_by_res(const void* mode1, const void* mode2)
{
    PgVideoModeInfo_t mode1_info;
    PgVideoModeInfo_t mode2_info;

    if (PgGetVideoModeInfo(*(unsigned short*)mode1, &mode1_info) < 0)
    {
        return 0;
    }

    if (PgGetVideoModeInfo(*(unsigned short*)mode2, &mode2_info) < 0)
    {
        return 0;
    }

    if (mode1_info.width == mode2_info.width)
    {
        return mode2_info.height - mode1_info.height;
    }
    else
    {
        return mode2_info.width - mode1_info.width;
    }
}

SDL_Rect **ph_ListModes(_THIS, SDL_PixelFormat *format, Uint32 flags)
{
    int i = 0;
    int j = 0;
    SDL_Rect Amodelist[PH_MAX_VIDEOMODES];

    for (i=0; i<PH_MAX_VIDEOMODES; i++)
    {
        SDL_modearray[i]=&SDL_modelist[i];
    }

    if (PgGetVideoModeList(&mode_list) < 0)
    {
       SDL_SetError("ph_ListModes(): PgGetVideoModeList() function failed !\n");
       return NULL;
    }

    mode_info.bits_per_pixel = 0;

    for (i=0; i < mode_list.num_modes; i++) 
    {
        if (PgGetVideoModeInfo(mode_list.modes[i], &mode_info) < 0)
        {
            SDL_SetError("ph_ListModes(): PgGetVideoModeInfo() function failed on mode: 0x%X.\n", mode_list.modes[i]);
            return NULL;
        }
        if(mode_info.bits_per_pixel == format->BitsPerPixel)
        {
            Amodelist[j].w = mode_info.width;
            Amodelist[j].h = mode_info.height;
            Amodelist[j].x = 0;
            Amodelist[j].y = 0;
            j++;	
        }
    }
	
    /* reorder biggest for smallest, assume width dominates */

    for(i=0; i<j; i++)
    {
        SDL_modelist[i].w = Amodelist[j - i - 1].w;
        SDL_modelist[i].h = Amodelist[j - i - 1].h;
        SDL_modelist[i].x = Amodelist[j - i - 1].x;
        SDL_modelist[i].y = Amodelist[j - i - 1].y;
    }
    SDL_modearray[j]=NULL;
	
    return SDL_modearray;
}

void ph_FreeVideoModes(_THIS)
{
   return;
}

/* return the mode associated with width, height and bpp */
/* if there is no mode then zero is returned             */
int ph_GetVideoMode(int width, int height, int bpp)
{
    int i;
    int modestage=0;
    int closestmode=0;

    if (PgGetVideoModeList(&mode_list) < 0)
    {
        return -1;
    }

    /* special case for the double-sized 320x200 mode */
    if ((width==640) && (height==400))
    {
       modestage=1;
    }

    /* search list for exact match */
    for (i=0; i<mode_list.num_modes; i++)
    {
        if (PgGetVideoModeInfo(mode_list.modes[i], &mode_info) < 0)
        {
            return 0;
        }

        if ((mode_info.width == width) && (mode_info.height == height) && 
            (mode_info.bits_per_pixel == bpp))
        {
            return mode_list.modes[i];
        }
        else
        {
           if ((modestage) && (mode_info.width == width) && (mode_info.height == height+80) && 
               (mode_info.bits_per_pixel == bpp))
           {
              modestage=2;
              closestmode=mode_list.modes[i];
           }
        }
    }

    /* if we are here, then no 640x400xbpp mode found and we'll emulate it via 640x480xbpp mode */
    if (modestage==2)
    {
       return closestmode;
    }

    return (i == mode_list.num_modes) ? 0 : mode_list.modes[i];
}

/* return the mode associated with width, height and bpp               */
/* if requested bpp is not found the mode with closest bpp is returned */
int get_mode_any_format(int width, int height, int bpp)
{
    int i, closest, delta, min_delta;

    if (PgGetVideoModeList(&mode_list) < 0)
    {
        return -1;
    }

    SDL_qsort(mode_list.modes, mode_list.num_modes, sizeof(unsigned short), compare_modes_by_res);

    for(i=0;i<mode_list.num_modes;i++)
    {
        if (PgGetVideoModeInfo(mode_list.modes[i], &mode_info) < 0)
        {
            return 0;
        }
        if ((mode_info.width == width) && (mode_info.height == height))
        {
           break;
        }
    }

    if (i<mode_list.num_modes)
    {
        /* get closest bpp */
        closest = i++;
        if (mode_info.bits_per_pixel == bpp)
        {
            return mode_list.modes[closest];
        }

        min_delta = abs(mode_info.bits_per_pixel - bpp);

        while(1)
        {
            if (PgGetVideoModeInfo(mode_list.modes[i], &mode_info) < 0)
            {
                return 0;
            }

            if ((mode_info.width != width) || (mode_info.height != height))
            {
                break;
            }
            else
            {
                if (mode_info.bits_per_pixel == bpp)
                {
                    closest = i;
                    break;
                }
                else
                {
                    delta = abs(mode_info.bits_per_pixel - bpp);
                    if (delta < min_delta)
                    {
                        closest = i;
                        min_delta = delta;
                    }
                    i++;
                }
            }
        }
        return mode_list.modes[closest];
    }

    return 0;
}

int ph_ToggleFullScreen(_THIS, int on)
{
    return -1;
}

int ph_EnterFullScreen(_THIS, SDL_Surface* screen, int fmode)
{
    PgDisplaySettings_t settings;
    int mode;
    char* refreshrate;
    int refreshratenum;

    if (!currently_fullscreen)
    {
        /* Get the video mode and set it */
        if (screen->flags & SDL_ANYFORMAT)
        {
            if ((mode = get_mode_any_format(screen->w, screen->h, screen->format->BitsPerPixel)) == 0)
            {
                SDL_SetError("ph_EnterFullScreen(): can't find appropriate video mode !\n");
                return 0;
            }
        }
        else
        {
            if ((mode = ph_GetVideoMode(screen->w, screen->h, screen->format->BitsPerPixel)) == 0)
            {
                SDL_SetError("ph_EnterFullScreen(): can't find appropriate video mode !\n");
                return 0;
            }
            if (PgGetVideoModeInfo(mode, &mode_info) < 0)
            {
                SDL_SetError("ph_EnterFullScreen(): can't get video mode capabilities !\n");
                return 0;
            }
            if (mode_info.height != screen->h)
            {
               if ((mode_info.height==480) && (screen->h==400))
               {
                  videomode_emulatemode=1;
               }
            }
            else
            {
               videomode_emulatemode=0;
            }
        }

        /* save old video mode caps */
        PgGetVideoMode(&settings);
        old_video_mode=settings.mode;
        old_refresh_rate=settings.refresh;

        /* setup new video mode */
        settings.mode = mode;
        settings.refresh = 0;
        settings.flags = 0;

        refreshrate=SDL_getenv("SDL_PHOTON_FULLSCREEN_REFRESH");
        if (refreshrate!=NULL)
        {
           if (SDL_sscanf(refreshrate, "%d", &refreshratenum)==1)
           {
               settings.refresh = refreshratenum;
           }
        }

        if (PgSetVideoMode(&settings) < 0)
        {
            SDL_SetError("ph_EnterFullScreen(): PgSetVideoMode() call failed !\n");
            return 0;
        }

        if (this->screen)
        {
            if ((this->screen->flags & SDL_OPENGL)==SDL_OPENGL)
            {
#if !SDL_VIDEO_OPENGL || (_NTO_VERSION < 630)
                return 0; /* 6.3.0 */
#endif
            }
        }

        if (fmode==0)
        {
            if (OCImage.direct_context==NULL)
            {
                OCImage.direct_context=(PdDirectContext_t*)PdCreateDirectContext();
                if (!OCImage.direct_context)
                {
                    SDL_SetError("ph_EnterFullScreen(): Can't create direct context !\n");
                    ph_LeaveFullScreen(this);
                    return 0;
                }
            }
            OCImage.oldDC=PdDirectStart(OCImage.direct_context);
        }

        currently_fullscreen = 1;
    }
    PgFlush();

    return 1;
}

int ph_LeaveFullScreen(_THIS)
{
    PgDisplaySettings_t oldmode_settings;
       
    if (currently_fullscreen)
    {
        if ((this->screen) && ((this->screen->flags & SDL_OPENGL)==SDL_OPENGL))
        {
#if !SDL_VIDEO_OPENGL || (_NTO_VERSION < 630)
            return 0;
#endif
        }

        /* release routines starts here */
        {
            if (OCImage.direct_context)
            {
                PdDirectStop(OCImage.direct_context);
                PdReleaseDirectContext(OCImage.direct_context);
                OCImage.direct_context=NULL;
            }
            if (OCImage.oldDC)
            {
                PhDCSetCurrent(OCImage.oldDC);
                OCImage.oldDC=NULL;
            }

            currently_fullscreen=0;

            /* Restore old video mode */
            if (old_video_mode != -1)
            {
                oldmode_settings.mode = (unsigned short) old_video_mode;
                oldmode_settings.refresh = (unsigned short) old_refresh_rate;
                oldmode_settings.flags = 0;
                
                if (PgSetVideoMode(&oldmode_settings) < 0)
                {
                    SDL_SetError("Ph_LeaveFullScreen(): PgSetVideoMode() function failed !\n");
                    return 0;
                }
            }

            old_video_mode=-1;
            old_refresh_rate=-1;
        }
    }
    return 1;
}