/*

  Simple DirectMedia Layer

  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>

  This software is provided 'as-is', without any express or implied

  warranty.  In no event will the authors be held liable for any damages

  arising from the use of this software.

  Permission is granted to anyone to use this software for any purpose,

  including commercial applications, and to alter it and redistribute it

  freely, subject to the following restrictions:

  1. The origin of this software must not be misrepresented; you must not

     claim that you wrote the original software. If you use this software

     in a product, an acknowledgment in the product documentation would be

     appreciated but is not required.

  2. Altered source versions must be plainly marked as such, and must not be

     misrepresented as being the original software.

  3. This notice may not be removed or altered from any source distribution.

*/

#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;

}