/*

    SDL - Simple DirectMedia Layer

    Copyright (C) 1997-2010 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

    SDL1.3 DirectFB driver by couriersud@arcor.de

*/

#include "SDL_DirectFB_video.h"

#include "SDL_DirectFB_window.h"

#include "../../events/SDL_windowevents_c.h"

#define COLOR_EXPAND(col) col.r, col.g, col.b, col.a

static DFB_Theme theme_std = {

    4, 4, 8, 8,

    {255, 200, 200, 200},

    24,

    {255, 0, 0, 255},

    16,

    {255, 255, 255, 255},

    "/usr/share/fonts/truetype/freefont/FreeSans.ttf",

    {255, 255, 0, 0},

    {255, 255, 255, 0},

};

static DFB_Theme theme_none = {

    0, 0, 0, 0,

    {0, 0, 0, 0},

    0,

    {0, 0, 0, 0},

    0,

    {0, 0, 0, 0},

    NULL

};

static void

DrawTriangle(IDirectFBSurface * s, int down, int x, int y, int w)

{

    int x1, x2, x3;

    int y1, y2, y3;

    if (down) {

        x1 = x + w / 2;

        x2 = x;

        x3 = x + w;

        y1 = y + w;

        y2 = y;

        y3 = y;

    } else {

        x1 = x + w / 2;

        x2 = x;

        x3 = x + w;

        y1 = y;

        y2 = y + w;

        y3 = y + w;

    }

    s->FillTriangle(s, x1, y1, x2, y2, x3, y3);

}

static void

LoadFont(_THIS, SDL_Window * window)

{

    SDL_DFB_DEVICEDATA(_this);

    SDL_DFB_WINDOWDATA(window);

	if (windata->font != NULL) {

		SDL_DFB_RELEASE(windata->font);

	    windata->font = NULL;

	    SDL_DFB_CHECK(windata->window_surface->SetFont(windata->window_surface, windata->font));

	}

	if (windata->theme.font != NULL)

	{

        DFBFontDescription fdesc;

		SDL_zero(fdesc);

	    fdesc.flags = DFDESC_HEIGHT;

	    fdesc.height = windata->theme.font_size;

	    SDL_DFB_CHECK(devdata->

	                  dfb->CreateFont(devdata->dfb, windata->theme.font,

	                                  &fdesc, &windata->font));

	    SDL_DFB_CHECK(windata->window_surface->SetFont(windata->window_surface, windata->font));

	}

}

static void

DrawCraption(_THIS, IDirectFBSurface * s, int x, int y, char *text)

{

    DFBSurfaceTextFlags flags;

    flags = DSTF_CENTER | DSTF_TOP;

    s->DrawString(s, text, -1, x, y, flags);

}

void

DirectFB_WM_RedrawLayout(_THIS, SDL_Window * window)

{

    SDL_DFB_WINDOWDATA(window);

    IDirectFBSurface *s = windata->window_surface;

    DFB_Theme *t = &windata->theme;

    int i;

    int d = (t->caption_size - t->font_size) / 2;

    int x, y, w;

    if (!windata->is_managed || (window->flags & SDL_WINDOW_FULLSCREEN))

        return;

    SDL_DFB_CHECK(s->SetSrcBlendFunction(s, DSBF_ONE));

    SDL_DFB_CHECK(s->SetDstBlendFunction(s, DSBF_ZERO));

    SDL_DFB_CHECK(s->SetDrawingFlags(s, DSDRAW_NOFX));

    SDL_DFB_CHECK(s->SetBlittingFlags(s, DSBLIT_NOFX));

	LoadFont(_this, window);

    //s->SetDrawingFlags(s, DSDRAW_BLEND);

    s->SetColor(s, COLOR_EXPAND(t->frame_color));

    /* top */

    for (i = 0; i < t->top_size; i++)

        s->DrawLine(s, 0, i, windata->size.w, i);

    /* bottom */

    for (i = windata->size.h - t->bottom_size; i < windata->size.h; i++)

        s->DrawLine(s, 0, i, windata->size.w, i);

    /* left */

    for (i = 0; i < t->left_size; i++)

        s->DrawLine(s, i, 0, i, windata->size.h);

    /* right */

    for (i = windata->size.w - t->right_size; i < windata->size.w; i++)

        s->DrawLine(s, i, 0, i, windata->size.h);

    /* Caption */

    s->SetColor(s, COLOR_EXPAND(t->caption_color));

    s->FillRectangle(s, t->left_size, t->top_size, windata->client.w,

                     t->caption_size);

    /* Close Button */

    w = t->caption_size;

    x = windata->size.w - t->right_size - w + d;

    y = t->top_size + d;

    s->SetColor(s, COLOR_EXPAND(t->close_color));

    DrawTriangle(s, 1, x, y, w - 2 * d);

    /* Max Button */

    s->SetColor(s, COLOR_EXPAND(t->max_color));

    DrawTriangle(s, window->flags & SDL_WINDOW_MAXIMIZED ? 1 : 0, x - w,

               y, w - 2 * d);

    /* Caption */

    if (window->title) {

	    s->SetColor(s, COLOR_EXPAND(t->font_color));

        DrawCraption(_this, s, (x - w) / 2, t->top_size + d, window->title);

    }

    /* Icon */

    if (windata->icon) {

        DFBRectangle dr;

        dr.x = t->left_size + d;

        dr.y = t->top_size + d;

        dr.w = w - 2 * d;

        dr.h = w - 2 * d;

        s->SetBlittingFlags(s, DSBLIT_BLEND_ALPHACHANNEL);

        s->StretchBlit(s, windata->icon, NULL, &dr);

    }

    windata->wm_needs_redraw = 0;

}

DFBResult

DirectFB_WM_GetClientSize(_THIS, SDL_Window * window, int *cw, int *ch)

{

    SDL_DFB_WINDOWDATA(window);

	IDirectFBWindow *dfbwin = windata->dfbwin;

    SDL_DFB_CHECK(dfbwin->GetSize(dfbwin, cw, ch));

    dfbwin->GetSize(dfbwin, cw, ch);

    *cw -= windata->theme.left_size + windata->theme.right_size;

    *ch -=

        windata->theme.top_size + windata->theme.caption_size +

        windata->theme.bottom_size;

    return DFB_OK;

}

void

DirectFB_WM_AdjustWindowLayout(SDL_Window * window, int flags, int w, int h)

{

    SDL_DFB_WINDOWDATA(window);

    if (!windata->is_managed)

        windata->theme = theme_none;

    else if (flags & SDL_WINDOW_BORDERLESS)

    	//desc.caps |= DWCAPS_NODECORATION;)

    	windata->theme = theme_none;

    else if (flags & SDL_WINDOW_FULLSCREEN) {

        windata->theme = theme_none;

    } else if (flags & SDL_WINDOW_MAXIMIZED) {

        windata->theme = theme_std;

        windata->theme.left_size = 0;

        windata->theme.right_size = 0;

        windata->theme.top_size = 0;

        windata->theme.bottom_size = 0;

    } else {

        windata->theme = theme_std;

    }

    windata->client.x = windata->theme.left_size;

    windata->client.y = windata->theme.top_size + windata->theme.caption_size;

    windata->client.w = w;

    windata->client.h = h;

    windata->size.w =

        w + windata->theme.left_size + windata->theme.right_size;

    windata->size.h =

        h + windata->theme.top_size +

        windata->theme.caption_size + windata->theme.bottom_size;

}

enum

{

    WM_POS_NONE = 0x00,

    WM_POS_CAPTION = 0x01,

    WM_POS_CLOSE = 0x02,

    WM_POS_MAX = 0x04,

    WM_POS_LEFT = 0x08,

    WM_POS_RIGHT = 0x10,

    WM_POS_TOP = 0x20,

    WM_POS_BOTTOM = 0x40,

};

static int

WMIsClient(DFB_WindowData * p, int x, int y)

{

    x -= p->client.x;

    y -= p->client.y;

    if (x < 0 || y < 0)

        return 0;

    if (x >= p->client.w || y >= p->client.h)

        return 0;

    return 1;

}

static int

WMPos(DFB_WindowData * p, int x, int y)

{

    int pos = WM_POS_NONE;

    if (!WMIsClient(p, x, y)) {

        if (y < p->theme.top_size) {

            pos |= WM_POS_TOP;

        } else if (y < p->client.y) {

            if (x <

                p->size.w - p->theme.right_size - 2 * p->theme.caption_size) {

                pos |= WM_POS_CAPTION;

            } else if (x <

                       p->size.w - p->theme.right_size -

                       p->theme.caption_size) {

                pos |= WM_POS_MAX;

            } else {

                pos |= WM_POS_CLOSE;

            }

        } else if (y >= p->size.h - p->theme.bottom_size) {

            pos |= WM_POS_BOTTOM;

        }

        if (x < p->theme.left_size) {

            pos |= WM_POS_LEFT;

        } else if (x >= p->size.w - p->theme.right_size) {

            pos |= WM_POS_RIGHT;

        }

    }

    return pos;

}

int

DirectFB_WM_ProcessEvent(_THIS, SDL_Window * window, DFBWindowEvent * evt)

{

    SDL_DFB_DEVICEDATA(_this);

    SDL_DFB_WINDOWDATA(window);

	DFB_WindowData *gwindata = ((devdata->grabbed_window) ? (DFB_WindowData *) ((devdata->grabbed_window)->driverdata) : NULL);

	IDirectFBWindow *dfbwin = windata->dfbwin;

    DFBWindowOptions wopts;

    if (!windata->is_managed)

        return 0;

    SDL_DFB_CHECK(dfbwin->GetOptions(dfbwin, &wopts));

    switch (evt->type) {

    case DWET_BUTTONDOWN:

        if (evt->buttons & DIBM_LEFT) {

            int pos = WMPos(windata, evt->x, evt->y);

            switch (pos) {

            case WM_POS_NONE:

                return 0;

            case WM_POS_CLOSE:

		        windata->wm_grab = WM_POS_NONE;

                SDL_SendWindowEvent(window, SDL_WINDOWEVENT_CLOSE, 0,

                                    0);

                return 1;

            case WM_POS_MAX:

		        windata->wm_grab = WM_POS_NONE;

				if (window->flags & SDL_WINDOW_MAXIMIZED) {

					SDL_RestoreWindow(window);

				} else {

					SDL_MaximizeWindow(window);

				}

                return 1;

            case WM_POS_CAPTION:

            	if (!(wopts & DWOP_KEEP_STACKING)) {

	                DirectFB_RaiseWindow(_this, window);

	            }

            	if (window->flags & SDL_WINDOW_MAXIMIZED)

            		return 1;

                /* fall through */

            default:

                windata->wm_grab = pos;

                if (gwindata != NULL)

	                SDL_DFB_CHECK(gwindata->dfbwin->UngrabPointer(gwindata->dfbwin));

                SDL_DFB_CHECK(dfbwin->GrabPointer(dfbwin));

                windata->wm_lastx = evt->cx;

                windata->wm_lasty = evt->cy;

            }

        }

        return 1;

    case DWET_BUTTONUP:

        if (!windata->wm_grab)

            return 0;

        if (!(evt->buttons & DIBM_LEFT)) {

            if (windata->wm_grab & (WM_POS_RIGHT | WM_POS_BOTTOM)) {

                int dx = evt->cx - windata->wm_lastx;

                int dy = evt->cy - windata->wm_lasty;

            	if (!(wopts & DWOP_KEEP_SIZE)) {

                    int cw, ch;

			        if ((windata->wm_grab & (WM_POS_BOTTOM | WM_POS_RIGHT)) == WM_POS_BOTTOM)

			        	dx = 0;

			        else if ((windata->wm_grab & (WM_POS_BOTTOM | WM_POS_RIGHT)) == WM_POS_RIGHT)

			        	dy = 0;

		            SDL_DFB_CHECK(dfbwin->GetSize(dfbwin, &cw, &ch));

		            /* necessary to trigger an event - ugly*/

					SDL_DFB_CHECK(dfbwin->DisableEvents(dfbwin, DWET_ALL));

		            SDL_DFB_CHECK(dfbwin->Resize(dfbwin, cw + dx + 1, ch + dy));

					SDL_DFB_CHECK(dfbwin->EnableEvents(dfbwin, DWET_ALL));

		            SDL_DFB_CHECK(dfbwin->Resize(dfbwin, cw + dx, ch + dy));

            	}

            }

            SDL_DFB_CHECK(dfbwin->UngrabPointer(dfbwin));

            if (gwindata != NULL)

                SDL_DFB_CHECK(gwindata->dfbwin->GrabPointer(gwindata->dfbwin));

            windata->wm_grab = WM_POS_NONE;

            return 1;

        }

        break;

    case DWET_MOTION:

        if (!windata->wm_grab)

            return 0;

        if (evt->buttons & DIBM_LEFT) {

        	int dx = evt->cx - windata->wm_lastx;

            int dy = evt->cy - windata->wm_lasty;

            if (windata->wm_grab & WM_POS_CAPTION) {

            	if (!(wopts & DWOP_KEEP_POSITION))

	                SDL_DFB_CHECK(dfbwin->Move(dfbwin, dx, dy));

            }

            if (windata->wm_grab & (WM_POS_RIGHT | WM_POS_BOTTOM)) {

				if (!(wopts & DWOP_KEEP_SIZE)) {

					int cw, ch;

					/* Make sure all events are disabled for this operation ! */

					SDL_DFB_CHECK(dfbwin->DisableEvents(dfbwin, DWET_ALL));

					if ((windata->wm_grab & (WM_POS_BOTTOM | WM_POS_RIGHT)) == WM_POS_BOTTOM)

						dx = 0;

					else if ((windata->wm_grab & (WM_POS_BOTTOM | WM_POS_RIGHT)) == WM_POS_RIGHT)

						dy = 0;

					SDL_DFB_CHECK(dfbwin->GetSize(dfbwin, &cw, &ch));

					SDL_DFB_CHECK(dfbwin->Resize(dfbwin, cw + dx, ch + dy));

					SDL_DFB_CHECK(dfbwin->EnableEvents(dfbwin, DWET_ALL));

				}

            }

			windata->wm_lastx = evt->cx;

			windata->wm_lasty = evt->cy;

			return 1;

        }

        break;

    case DWET_KEYDOWN:

        break;

    case DWET_KEYUP:

        break;

    default:

        ;

    }

    return 0;

}