/**************************************************************************
* Tint2 : systraybar
*
* Copyright (C) 2009 thierry lorthiois (lorthiois@bbsoft.fr)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
**************************************************************************/

#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
#include <Imlib2.h>

#include "systraybar.h"
#include "server.h"
#include "panel.h"

GSList *icons;

/* defined in the systray spec */
#define SYSTEM_TRAY_REQUEST_DOCK    0
#define SYSTEM_TRAY_BEGIN_MESSAGE   1
#define SYSTEM_TRAY_CANCEL_MESSAGE  2

// selection window
Window net_sel_win = None, hint_win = None;

// freedesktop specification doesn't allow multi systray
Systraybar systray;


void init_systray()
{
	Panel *panel = &panel1[0];
	systray.area.parent = panel;
	systray.area.panel = panel;
	systray.area._draw_foreground = draw_systray;
	systray.area._resize = resize_systray;

	if (systray.area.on_screen)
		systray.area.on_screen = init_net();

	if (!systray.area.on_screen)
		return;

	// configure systray
	// draw only one systray (even with multi panel)
	systray.area.posy = panel->area.pix.border.width + panel->area.paddingy;
	systray.area.height = panel->area.height - (2 * systray.area.posy);
	systray.area.width = 0;

	systray.area.posx = panel->area.width - panel->area.paddingxlr - panel->area.pix.border.width - systray.area.width;
	if (panel->clock.area.on_screen)
		systray.area.posx -= (panel->clock.area.width + panel->area.paddingx);
	if (panel->battery.area.on_screen)
		systray.area.posx -= (panel->battery.area.width + panel->area.paddingx);

	systray.area.redraw = 1;
}


void cleanup_systray()
{
   if (systray.list_icons) {
		GSList *it;

		for (it = systray.list_icons; it; it = it->next)
			remove_icon((TrayWindow*)it->data);

      g_slist_free(systray.list_icons);
      systray.list_icons = 0;
   }

	free_area(&systray.area);

	cleanup_net();
}


void draw_systray(void *obj, cairo_t *c, int active)
{
	Systraybar *sysbar = obj;
	Panel *panel = sysbar->area.panel;
	TrayWindow *traywin;
	GSList *l;
	int icon_size;

	printf("draw_systray %d %d\n", systray.area.posx, systray.area.width);
	icon_size = sysbar->area.height - (2 * sysbar->area.pix.border.width) - (2 * sysbar->area.paddingy);
	for (l = systray.list_icons; l ; l = l->next) {
		traywin = (TrayWindow*)l->data;

		// watch for the icon trying to resize itself!
		XSelectInput(server.dsp, traywin->id, StructureNotifyMask);

		// position and size the icon window
		XMoveResizeWindow(server.dsp, traywin->id, traywin->x, traywin->y, icon_size, icon_size);

		// resize our window so that the new window can fit in it
		//fix_geometry();

		// flush before clearing, otherwise the clear isn't effective.
		XFlush(server.dsp);
		// make sure the new child will get the right stuff in its background
		// for ParentRelative.
		XClearWindow(server.dsp, panel->main_win);

		// show the window
		XMapRaised(server.dsp, traywin->id);
	}
}


void resize_systray(void *obj)
{
	Systraybar *sysbar = obj;
	Panel *panel = sysbar->area.panel;
	TrayWindow *traywin;
	GSList *l;
	int count, posx, posy;
	int icon_size;

	icon_size = sysbar->area.height - (2 * sysbar->area.pix.border.width) - (2 * sysbar->area.paddingy);
	count = g_slist_length(systray.list_icons);

	if (!count) systray.area.width = 0;
	else systray.area.width = (2 * systray.area.pix.border.width) + (2 * systray.area.paddingxlr) + (icon_size * count) + ((count-1) * systray.area.paddingx);

	systray.area.posx = panel->area.width - panel->area.pix.border.width - panel->area.paddingxlr - systray.area.width;
	if (panel->clock.area.on_screen)
		systray.area.posx -= (panel->clock.area.width + panel->area.paddingx);
	if (panel->battery.area.on_screen)
		systray.area.posx -= (panel->battery.area.width + panel->area.paddingx);

	systray.area.redraw = 1;

	posy = panel->area.pix.border.width + panel->area.paddingy + systray.area.pix.border.width + systray.area.paddingy;
	posx = systray.area.posx + systray.area.pix.border.width + systray.area.paddingxlr;
	for (l = systray.list_icons; l ; l = l->next) {
		traywin = (TrayWindow*)l->data;

		traywin->y = posy;
		traywin->x = posx;
		posx += (icon_size + systray.area.paddingx);
	}

	// resize other objects on panel
	printf("resize_systray %d %d\n", systray.area.posx, systray.area.width);
}

/*
void create_hint_win()
{
   XWMHints hints;
   XClassHint classhints;
	Panel *panel = systray.area.panel;

	hint_win = XCreateSimpleWindow(server.dsp, server.root_win, 0, 0, 1, 1, 0, 0, 0);

	hints.flags = StateHint | WindowGroupHint | IconWindowHint;
	hints.initial_state = WithdrawnState;
	hints.window_group = hint_win;
	hints.icon_window = panel->main_win;

	classhints.res_name = "docker";
	classhints.res_class = "Docker";

	XSetWMProperties(server.dsp, hint_win, NULL, NULL, NULL, 0,
						 NULL, &hints, &classhints);

	XMapWindow(server.dsp, hint_win);
}
*/

int init_net()
{
	if (XGetSelectionOwner(server.dsp, server.atom._NET_SYSTEM_TRAY_SCREEN) != None) {
		fprintf(stderr, "tint2 : another systray is running\n");
		return 0;
	}

	//create_hint_win();

	// init systray protocol
   net_sel_win = XCreateSimpleWindow(server.dsp, server.root_win, -1, -1, 1, 1, 0, 0, 0);

	// v0.2 trayer specification. tint2 always orizontal.
	int orient = 0;
	XChangeProperty(server.dsp, net_sel_win, server.atom._NET_SYSTEM_TRAY_ORIENTATION, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &orient, 1);

	XSetSelectionOwner(server.dsp, server.atom._NET_SYSTEM_TRAY_SCREEN, net_sel_win, CurrentTime);
	if (XGetSelectionOwner(server.dsp, server.atom._NET_SYSTEM_TRAY_SCREEN) != net_sel_win) {
		fprintf(stderr, "tint2 : can't get systray manager\n");
		return 0;
 	}

   XClientMessageEvent ev;
	ev.type = ClientMessage;
   ev.window = server.root_win;
	ev.message_type = server.atom.MANAGER;
	ev.format = 32;
	ev.data.l[0] = CurrentTime;
	ev.data.l[1] = server.atom._NET_SYSTEM_TRAY_SCREEN;
	ev.data.l[2] = net_sel_win;
	ev.data.l[3] = 0;
	ev.data.l[4] = 0;
	XSendEvent(server.dsp, server.root_win, False, StructureNotifyMask, (XEvent*)&ev);

	return 1;
}


void cleanup_net()
{
	if (net_sel_win != None) {
  		XDestroyWindow(server.dsp, net_sel_win);
  		net_sel_win = None;
	}
}


/*
void fix_geometry()
{
  GSList *it;
  Panel *panel = systray.area.panel;

  // find the proper width and height
  width = 0;
  height = icon_size;
  for (it = icons; it != NULL; it = g_slist_next(it)) {
    width += icon_size;
  }

  XResizeWindow(server.dsp, panel->main_win, width + border * 2, height + border * 2);
}
*/

gboolean error;
int window_error_handler(Display *d, XErrorEvent *e)
{
  d=d;e=e;
  if (e->error_code == BadWindow) {
    error = TRUE;
  } else {
    //g_printerr("X ERROR NOT BAD WINDOW!\n");
    abort();
  }
  return 0;
}


gboolean icon_swallow(Window id)
{
  XErrorHandler old;
  Panel *panel = systray.area.panel;

  error = FALSE;
  old = XSetErrorHandler(window_error_handler);
  XReparentWindow(server.dsp, id, panel->main_win, 0, 0);
  XSync(server.dsp, False);
  XSetErrorHandler(old);

  return !error;
}


// The traywin must have its id and type set.
gboolean add_icon(Window id)
{
	TrayWindow *traywin;

	if (!icon_swallow(id)) {
		fprintf(stderr, "tint2 : not icon_swallow\n");
		return FALSE;
	}

	traywin = g_new0(TrayWindow, 1);
	traywin->id = id;

	systray.list_icons = g_slist_prepend(systray.list_icons, traywin);
  	printf("ajout d'un icone %d (%lx)\n", g_slist_length(systray.list_icons), id);
  	systray.area.resize = 1;
  	systray.area.redraw = 1;

	// changed in systray force resize on panel
	Panel *panel = systray.area.panel;
	panel->area.resize = 1;
	panel_refresh = 1;

// => calcul x, y, width, height dans resize
/*
	// find the positon for the systray app window
	int count = g_slist_length(icons);
	traywin->x = border + ((width % icon_size) / 2) +
	(count % (width / icon_size)) * icon_size;
	traywin->y = border + ((height % icon_size) / 2) +
	(count / (height / icon_size)) * icon_size;

	// add the new icon to the list
	icons = g_slist_append(icons, traywin);
*/

	return TRUE;
}


void remove_icon(TrayWindow *traywin)
{
	XErrorHandler old;

	XSelectInput(server.dsp, traywin->id, NoEventMask);

	// reparent to root
	error = FALSE;
	old = XSetErrorHandler(window_error_handler);
	XReparentWindow(server.dsp, traywin->id, server.root_win, 0, 0);
	XSync(server.dsp, False);
	XSetErrorHandler(old);

	// remove from our list
	systray.list_icons = g_slist_remove(systray.list_icons, traywin);
	g_free(traywin);
	printf("suppression d'un icone %d\n", g_slist_length(systray.list_icons));
  	systray.area.resize = 1;

	// changed in systray force resize on panel
	Panel *panel = systray.area.panel;
	panel->area.resize = 1;
	panel_refresh = 1;

}


void net_message(XClientMessageEvent *e)
{
	unsigned long opcode;
	Window id;

	opcode = e->data.l[1];

	switch (opcode) {
		case SYSTEM_TRAY_REQUEST_DOCK:
			id = e->data.l[2];
			if (id) add_icon(id);
			break;

		case SYSTEM_TRAY_BEGIN_MESSAGE:
			printf("message from dockapp\n");
			id = e->window;
			break;

		case SYSTEM_TRAY_CANCEL_MESSAGE:
			printf("message cancelled\n");
			id = e->window;
			break;

		default:
			if (opcode == server.atom._NET_SYSTEM_TRAY_MESSAGE_DATA) {
				printf("message from dockapp:\n  %s\n", e->data.b);
				id = e->window;
			}
			// unknown message type. not in the spec
			break;
	}
}