/*
 *  Window Maker window manager
 *
 *  Copyright (c) 1997-2004 Alfredo K. Kojima
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
 *  USA.
 */

#include "wconfig.h"

#include <stdlib.h>
#include <string.h>
#include <sys/time.h>

#include "WindowMaker.h"
#include "screen.h"
#include "wcore.h"
#include "framewin.h"
#include "window.h"
#include "defaults.h"
#include "switchpanel.h"
#include "funcs.h"
#include "xinerama.h"
#include "window.h"

extern Atom _XA_WM_IGNORE_FOCUS_EVENTS;

#ifdef SHAPE
#include <X11/extensions/shape.h>

extern Bool wShapeSupported;
#endif

struct SwitchPanel {
	WScreen *scr;
	WMWindow *win;
	WMFrame *iconBox;

	WMArray *icons;
	WMArray *images;
	WMArray *windows;
	RImage *bg;
	int current;
	int firstVisible;
	int visibleCount;

	WMLabel *label;

	RImage *defIcon;

	RImage *tileTmp;
	RImage *tile;

	WMFont *font;
	WMColor *white;
};

extern WPreferences wPreferences;

#define BORDER_SPACE 10
#define ICON_SIZE 48
#define ICON_TILE_SIZE 64
#define LABEL_HEIGHT 25
#define SCREEN_BORDER_SPACING 2*20
#define SCROLL_STEPS (ICON_TILE_SIZE/2)

static int canReceiveFocus(WWindow * wwin)
{
	if (wwin->frame->workspace != wwin->screen_ptr->current_workspace)
		return 0;
	if (!wwin->flags.mapped) {
		if (!wwin->flags.shaded && !wwin->flags.miniaturized && !wwin->flags.hidden)
			return 0;
		else
			return -1;
	}
	if (WFLAGP(wwin, no_focusable))
		return 0;
	return 1;
}

static void changeImage(WSwitchPanel * panel, int idecks, int selected)
{
	WMFrame *icon = WMGetFromArray(panel->icons, idecks);
	RImage *image = WMGetFromArray(panel->images, idecks);

	if (!panel->bg && !panel->tile) {
		if (!selected)
			WMSetFrameRelief(icon, WRFlat);
	}

	if (image && icon) {
		RImage *back;
		int opaq = 255;
		RImage *tile;
		WMPoint pos;
		Pixmap p;

		if (canReceiveFocus(WMGetFromArray(panel->windows, idecks)) < 0)
			opaq = 50;

		pos = WMGetViewPosition(WMWidgetView(icon));
		back = panel->tileTmp;
		if (panel->bg)
			RCopyArea(back, panel->bg,
				  BORDER_SPACE + pos.x - panel->firstVisible * ICON_TILE_SIZE,
				  BORDER_SPACE + pos.y, back->width, back->height, 0, 0);
		else {
			RColor color;
			WMScreen *wscr = WMWidgetScreen(icon);
			color.red = 255;
			color.red = WMRedComponentOfColor(WMGrayColor(wscr)) >> 8;
			color.green = WMGreenComponentOfColor(WMGrayColor(wscr)) >> 8;
			color.blue = WMBlueComponentOfColor(WMGrayColor(wscr)) >> 8;
			RFillImage(back, &color);
		}
		if (selected) {
			tile = panel->tile;
			RCombineArea(back, tile, 0, 0, tile->width, tile->height,
				     (back->width - tile->width) / 2, (back->height - tile->height) / 2);
		}
		RCombineAreaWithOpaqueness(back, image, 0, 0, image->width, image->height,
					   (back->width - image->width) / 2, (back->height - image->height) / 2,
					   opaq);

		RConvertImage(panel->scr->rcontext, back, &p);
		XSetWindowBackgroundPixmap(dpy, WMWidgetXID(icon), p);
		XClearWindow(dpy, WMWidgetXID(icon));
		XFreePixmap(dpy, p);
	}

	if (!panel->bg && !panel->tile) {
		if (selected)
			WMSetFrameRelief(icon, WRSimple);
	}
}

static RImage *scaleDownIfNeeded(RImage * image)
{
	if (image && ((image->width - ICON_SIZE) > 2 || (image->height - ICON_SIZE) > 2)) {
		RImage *nimage;
		nimage = RScaleImage(image, ICON_SIZE, (image->height * ICON_SIZE / image->width));
		RReleaseImage(image);
		image = nimage;
	}
	return image;
}

static void addIconForWindow(WSwitchPanel * panel, WMWidget * parent, WWindow * wwin, int x, int y)
{
	WMFrame *icon = WMCreateFrame(parent);
	RImage *image = NULL;

	WMSetFrameRelief(icon, WRFlat);
	WMResizeWidget(icon, ICON_TILE_SIZE, ICON_TILE_SIZE);
	WMMoveWidget(icon, x, y);

	if (!WFLAGP(wwin, always_user_icon) && wwin->net_icon_image)
		image = RRetainImage(wwin->net_icon_image);

	// Make this use a caching thing. When there are many windows,
	// it's very likely that most of them are instances of the same thing,
	// so caching them should get performance acceptable in these cases.
	if (!image)
		image = wDefaultGetImage(panel->scr, wwin->wm_instance, wwin->wm_class);

	if (!image && !panel->defIcon) {
		char *file = wDefaultGetIconFile(panel->scr, NULL, NULL, False);
		if (file) {
			char *path = FindImage(wPreferences.icon_path, file);
			if (path) {
				image = RLoadImage(panel->scr->rcontext, path, 0);
				wfree(path);
			}
		}
		if (image)
			panel->defIcon = scaleDownIfNeeded(image);
		image = NULL;
	}
	if (!image && panel->defIcon)
		image = RRetainImage(panel->defIcon);

	image = scaleDownIfNeeded(image);

	WMAddToArray(panel->images, image);
	WMAddToArray(panel->icons, icon);
}

static void scrollIcons(WSwitchPanel * panel, int delta)
{
	int nfirst = panel->firstVisible + delta;
	int i;
	int count = WMGetArrayItemCount(panel->windows);
//    int nx, ox;
//    struct timeval tv1, tv2;

	if (count <= panel->visibleCount)
		return;

	if (nfirst < 0)
		nfirst = 0;
	else if (nfirst >= count - panel->visibleCount)
		nfirst = count - panel->visibleCount;

	if (nfirst == panel->firstVisible)
		return;
/*
    ox = -panel->firstVisible * ICON_TILE_SIZE;
    nx = -nfirst * ICON_TILE_SIZE;
    for (i= 0; i < SCROLL_STEPS; i++) {
        unsigned int diff;
        gettimeofday(&tv1, NULL);
        WMMoveWidget(panel->iconBox, (nx*i + ox*(SCROLL_STEPS-i))/(SCROLL_STEPS-1), 0);
        XSync(dpy, False);
        gettimeofday(&tv2, NULL);
        diff = (tv2.tv_sec-tv1.tv_sec)*10000+(tv2.tv_usec-tv1.tv_usec)/100;
        if (diff < 200)
          wusleep(300-diff);
    }
 */
	WMMoveWidget(panel->iconBox, -nfirst * ICON_TILE_SIZE, 0);

	panel->firstVisible = nfirst;

	for (i = panel->firstVisible; i < panel->firstVisible + panel->visibleCount; i++) {
		changeImage(panel, i, i == panel->current);
	}
}

/*
 * 0 1 2
 * 3 4 5
 * 6 7 8
 */
static RImage *assemblePuzzleImage(RImage ** images, int width, int height)
{
	RImage *img = RCreateImage(width, height, 1);
	RImage *tmp;
	int tw, th;
	RColor color;
	if (!img)
		return NULL;

	color.red = 0;
	color.green = 0;
	color.blue = 0;
	color.alpha = 255;

	RFillImage(img, &color);

	tw = width - images[0]->width - images[2]->width;
	th = height - images[0]->height - images[6]->height;

	if (tw <= 0 || th <= 0) {
		//XXX
		return NULL;
	}

	/* top */
	if (tw > 0) {
		tmp = RSmoothScaleImage(images[1], tw, images[1]->height);
		RCopyArea(img, tmp, 0, 0, tmp->width, tmp->height, images[0]->width, 0);
		RReleaseImage(tmp);
	}
	/* bottom */
	if (tw > 0) {
		tmp = RSmoothScaleImage(images[7], tw, images[7]->height);
		RCopyArea(img, tmp, 0, 0, tmp->width, tmp->height, images[6]->width, height - images[6]->height);
		RReleaseImage(tmp);
	}
	/* left */
	if (th > 0) {
		tmp = RSmoothScaleImage(images[3], images[3]->width, th);
		RCopyArea(img, tmp, 0, 0, tmp->width, tmp->height, 0, images[0]->height);
		RReleaseImage(tmp);
	}
	/* right */
	if (th > 0) {
		tmp = RSmoothScaleImage(images[5], images[5]->width, th);
		RCopyArea(img, tmp, 0, 0, tmp->width, tmp->height, width - images[5]->width, images[2]->height);
		RReleaseImage(tmp);
	}
	/* center */
	if (tw > 0 && th > 0) {
		tmp = RSmoothScaleImage(images[4], tw, th);
		RCopyArea(img, tmp, 0, 0, tmp->width, tmp->height, images[0]->width, images[0]->height);
		RReleaseImage(tmp);
	}

	/* corners */
	RCopyArea(img, images[0], 0, 0, images[0]->width, images[0]->height, 0, 0);

	RCopyArea(img, images[2], 0, 0, images[2]->width, images[2]->height, width - images[2]->width, 0);

	RCopyArea(img, images[6], 0, 0, images[6]->width, images[6]->height, 0, height - images[6]->height);

	RCopyArea(img, images[8], 0, 0, images[8]->width, images[8]->height,
		  width - images[8]->width, height - images[8]->height);

	return img;
}

static RImage *createBackImage(WScreen * scr, int width, int height)
{
	return assemblePuzzleImage(wPreferences.swbackImage, width, height);
}

static RImage *getTile(WSwitchPanel * panel)
{
	RImage *stile;

	if (!wPreferences.swtileImage)
		return NULL;

	stile = RScaleImage(wPreferences.swtileImage, ICON_TILE_SIZE, ICON_TILE_SIZE);
	if (!stile)
		return wPreferences.swtileImage;

	return stile;
}

static void drawTitle(WSwitchPanel * panel, int idecks, char *title)
{
	char *ntitle;
	int width = WMWidgetWidth(panel->win);
	int x;

	if (title)
		ntitle = ShrinkString(panel->font, title, width - 2 * BORDER_SPACE);
	else
		ntitle = NULL;

	if (panel->bg) {
		if (ntitle) {
			if (strcmp(ntitle, title) != 0)
				x = BORDER_SPACE;
			else {
				int w = WMWidthOfString(panel->font, ntitle, strlen(ntitle));

				x = BORDER_SPACE + (idecks - panel->firstVisible) * ICON_TILE_SIZE +
				    ICON_TILE_SIZE / 2 - w / 2;
				if (x < BORDER_SPACE)
					x = BORDER_SPACE;
				else if (x + w > width - BORDER_SPACE)
					x = width - BORDER_SPACE - w;
			}
		}
		XClearWindow(dpy, WMWidgetXID(panel->win));
		if (ntitle)
			WMDrawString(panel->scr->wmscreen,
				     WMWidgetXID(panel->win),
				     panel->white, panel->font,
				     x,
				     WMWidgetHeight(panel->win) - BORDER_SPACE - LABEL_HEIGHT +
				     WMFontHeight(panel->font) / 2, ntitle, strlen(ntitle));
	} else {
		if (ntitle)
			WMSetLabelText(panel->label, ntitle);
	}
	if (ntitle)
		free(ntitle);
}

static WMArray *makeWindowListArray(WScreen * scr, WWindow * curwin, int workspace, int include_unmapped)
{
	WMArray *windows = WMCreateArray(10);
	int fl;
	WWindow *wwin;

	for (fl = 0; fl < 2; fl++) {
		for (wwin = curwin; wwin; wwin = wwin->prev) {
			if (((!fl && canReceiveFocus(wwin) > 0) || (fl && canReceiveFocus(wwin) < 0)) &&
			    (!WFLAGP(wwin, skip_window_list) || wwin->flags.internal_window) &&
			    (wwin->flags.mapped || include_unmapped)) {
				WMAddToArray(windows, wwin);
			}
		}
		wwin = curwin;
		/* start over from the beginning of the list */
		while (wwin->next)
			wwin = wwin->next;

		for (wwin = curwin; wwin && wwin != curwin; wwin = wwin->prev) {
			if (((!fl && canReceiveFocus(wwin) > 0) || (fl && canReceiveFocus(wwin) < 0)) &&
			    (!WFLAGP(wwin, skip_window_list) || wwin->flags.internal_window) &&
			    (wwin->flags.mapped || include_unmapped)) {
				WMAddToArray(windows, wwin);
			}
		}
	}

	return windows;
}

WSwitchPanel *wInitSwitchPanel(WScreen * scr, WWindow * curwin, int workspace)
{
	WWindow *wwin;
	WSwitchPanel *panel = wmalloc(sizeof(WSwitchPanel));
	WMFrame *viewport;
	int i;
	int width, height;
	int iconsThatFitCount;
	int count;
	WMRect rect;
	rect = wGetRectForHead(scr, wGetHeadForPointerLocation(scr));

	memset(panel, 0, sizeof(WSwitchPanel));

	panel->scr = scr;

	panel->windows = makeWindowListArray(scr, curwin, workspace, wPreferences.swtileImage != 0);
	count = WMGetArrayItemCount(panel->windows);

	if (count == 0) {
		WMFreeArray(panel->windows);
		wfree(panel);
		return NULL;
	}

	width = ICON_TILE_SIZE * count;
	iconsThatFitCount = count;

	if (width > rect.size.width) {
		iconsThatFitCount = (rect.size.width - SCREEN_BORDER_SPACING) / ICON_TILE_SIZE;
		width = iconsThatFitCount * ICON_TILE_SIZE;
	}

	panel->visibleCount = iconsThatFitCount;

	if (!wPreferences.swtileImage)
		return panel;

	height = LABEL_HEIGHT + ICON_TILE_SIZE;

	panel->tileTmp = RCreateImage(ICON_TILE_SIZE, ICON_TILE_SIZE, 1);
	panel->tile = getTile(panel);
	if (panel->tile && wPreferences.swbackImage[8]) {
		panel->bg = createBackImage(scr, width + 2 * BORDER_SPACE, height + 2 * BORDER_SPACE);
	}
	if (!panel->tileTmp || !panel->tile) {
		if (panel->bg)
			RReleaseImage(panel->bg);
		panel->bg = NULL;
		if (panel->tile)
			RReleaseImage(panel->tile);
		panel->tile = NULL;
		if (panel->tileTmp)
			RReleaseImage(panel->tileTmp);
		panel->tileTmp = NULL;
	}

	panel->white = WMWhiteColor(scr->wmscreen);
	panel->font = WMBoldSystemFontOfSize(scr->wmscreen, 12);
	panel->icons = WMCreateArray(count);
	panel->images = WMCreateArray(count);

	panel->win = WMCreateWindow(scr->wmscreen, "");

	if (!panel->bg) {
		WMFrame *frame = WMCreateFrame(panel->win);
		WMColor *darkGray = WMDarkGrayColor(scr->wmscreen);
		WMSetFrameRelief(frame, WRSimple);
		WMSetViewExpandsToParent(WMWidgetView(frame), 0, 0, 0, 0);

		panel->label = WMCreateLabel(panel->win);
		WMResizeWidget(panel->label, width, LABEL_HEIGHT);
		WMMoveWidget(panel->label, BORDER_SPACE, BORDER_SPACE + ICON_TILE_SIZE + 5);
		WMSetLabelRelief(panel->label, WRSimple);
		WMSetWidgetBackgroundColor(panel->label, darkGray);
		WMSetLabelFont(panel->label, panel->font);
		WMSetLabelTextColor(panel->label, panel->white);

		WMReleaseColor(darkGray);
		height += 5;
	}

	WMResizeWidget(panel->win, width + 2 * BORDER_SPACE, height + 2 * BORDER_SPACE);

	viewport = WMCreateFrame(panel->win);
	WMResizeWidget(viewport, width, ICON_TILE_SIZE);
	WMMoveWidget(viewport, BORDER_SPACE, BORDER_SPACE);
	WMSetFrameRelief(viewport, WRFlat);

	panel->iconBox = WMCreateFrame(viewport);
	WMMoveWidget(panel->iconBox, 0, 0);
	WMResizeWidget(panel->iconBox, ICON_TILE_SIZE * count, ICON_TILE_SIZE);
	WMSetFrameRelief(panel->iconBox, WRFlat);

	WM_ITERATE_ARRAY(panel->windows, wwin, i) {
		addIconForWindow(panel, panel->iconBox, wwin, i * ICON_TILE_SIZE, 0);
	}

	WMMapSubwidgets(panel->win);
	WMRealizeWidget(panel->win);

	WM_ITERATE_ARRAY(panel->windows, wwin, i) {
		changeImage(panel, i, 0);
	}

	if (panel->bg) {
		Pixmap pixmap, mask;

		RConvertImageMask(scr->rcontext, panel->bg, &pixmap, &mask, 250);

		XSetWindowBackgroundPixmap(dpy, WMWidgetXID(panel->win), pixmap);

#ifdef SHAPE
		if (mask && wShapeSupported)
			XShapeCombineMask(dpy, WMWidgetXID(panel->win), ShapeBounding, 0, 0, mask, ShapeSet);
#endif

		if (pixmap)
			XFreePixmap(dpy, pixmap);
		if (mask)
			XFreePixmap(dpy, mask);
	}

	{
		WMPoint center;
		center = wGetPointToCenterRectInHead(scr, wGetHeadForPointerLocation(scr),
						     width + 2 * BORDER_SPACE, height + 2 * BORDER_SPACE);
		WMMoveWidget(panel->win, center.x, center.y);
	}

	panel->current = WMGetFirstInArray(panel->windows, curwin);
	if (panel->current >= 0)
		changeImage(panel, panel->current, 1);

	WMMapWidget(panel->win);

	return panel;
}

void wSwitchPanelDestroy(WSwitchPanel * panel)
{
	int i;
	RImage *image;

	if (panel->win) {
		Window info_win = panel->scr->info_window;
		XEvent ev;
		ev.xclient.type = ClientMessage;
		ev.xclient.message_type = _XA_WM_IGNORE_FOCUS_EVENTS;
		ev.xclient.format = 32;
		ev.xclient.data.l[0] = True;

		XSendEvent(dpy, info_win, True, EnterWindowMask, &ev);
		WMUnmapWidget(panel->win);

		ev.xclient.data.l[0] = False;
		XSendEvent(dpy, info_win, True, EnterWindowMask, &ev);
	}

	if (panel->images) {
		WM_ITERATE_ARRAY(panel->images, image, i) {
			if (image)
				RReleaseImage(image);
		}
		WMFreeArray(panel->images);
	}
	if (panel->win)
		WMDestroyWidget(panel->win);
	if (panel->icons)
		WMFreeArray(panel->icons);
	WMFreeArray(panel->windows);
	if (panel->defIcon)
		RReleaseImage(panel->defIcon);
	if (panel->tile)
		RReleaseImage(panel->tile);
	if (panel->tileTmp)
		RReleaseImage(panel->tileTmp);
	if (panel->bg)
		RReleaseImage(panel->bg);
	if (panel->font)
		WMReleaseFont(panel->font);
	if (panel->white)
		WMReleaseColor(panel->white);
	wfree(panel);
}

WWindow *wSwitchPanelSelectNext(WSwitchPanel * panel, int back)
{
	WWindow *wwin;
	int count = WMGetArrayItemCount(panel->windows);

	if (count == 0)
		return NULL;

	if (panel->win)
		changeImage(panel, panel->current, 0);

	if (back)
		panel->current--;
	else
		panel->current++;

	wwin = WMGetFromArray(panel->windows, (count + panel->current) % count);

	if (back) {
		if (panel->current < 0)
			scrollIcons(panel, count);
		else if (panel->current < panel->firstVisible)
			scrollIcons(panel, -1);
	} else {
		if (panel->current >= count)
			scrollIcons(panel, -count);
		else if (panel->current - panel->firstVisible >= panel->visibleCount)
			scrollIcons(panel, 1);
	}

	panel->current = (count + panel->current) % count;

	if (panel->win) {
		drawTitle(panel, panel->current, wwin->frame->title);

		changeImage(panel, panel->current, 1);
	}

	return wwin;
}

WWindow *wSwitchPanelSelectFirst(WSwitchPanel * panel, int back)
{
	WWindow *wwin;
	int count = WMGetArrayItemCount(panel->windows);

	if (count == 0)
		return NULL;

	if (panel->win)
		changeImage(panel, panel->current, 0);

	if (back) {
		panel->current = count - 1;
		scrollIcons(panel, count);
	} else {
		panel->current = 0;
		scrollIcons(panel, -count);
	}

	wwin = WMGetFromArray(panel->windows, panel->current);

	if (panel->win) {
		drawTitle(panel, panel->current, wwin->frame->title);

		changeImage(panel, panel->current, 1);
	}
	return wwin;
}

WWindow *wSwitchPanelHandleEvent(WSwitchPanel * panel, XEvent * event)
{
	WMFrame *icon;
	int i;
	int focus = -1;

	if (!panel->win)
		return NULL;

	/*   if (event->type == LeaveNotify) {
	   if (event->xcrossing.window == WMWidgetXID(panel->win))
	   focus= 0;
	   } else */ if (event->type == MotionNotify) {

		WM_ITERATE_ARRAY(panel->icons, icon, i) {
			if (WMWidgetXID(icon) == event->xmotion.window) {
				focus = i;
				break;
			}
		}
	}
	if (focus >= 0 && panel->current != focus) {
		WWindow *wwin;

		changeImage(panel, panel->current, 0);
		changeImage(panel, focus, 1);
		panel->current = focus;

		wwin = WMGetFromArray(panel->windows, focus);

		drawTitle(panel, panel->current, wwin->frame->title);

		return wwin;
	}

	return NULL;
}

Window wSwitchPanelGetWindow(WSwitchPanel * swpanel)
{
	if (!swpanel->win)
		return None;
	return WMWidgetXID(swpanel->win);
}