/* 
 * Copyright (C) 2000 Shawn Betts
 * 
 * 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, 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 software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA */

#include <unistd.h>
#include <sys/wait.h>
#include <X11/keysym.h>
#include <string.h>
#include <time.h>

#include "ratpoison.h"

/* Initialization of the key structure */
rp_action key_actions[] = { {KEY_PREFIX, 0, 0, generate_prefix},
                            {XK_c, -1, TERM_PROG, spawn},
			    {XK_e, -1, "emacs", spawn},
			    {XK_p, -1, 0, prev_window},
			    {XK_n, -1, 0, next_window},
			    {XK_space, -1, 0, next_window},
			    {XK_colon, 0, 0, execute_command},
			    {XK_exclam, 0, 0, execute_command},
			    {KEY_PREFIX, -1, 0, last_window},
			    {XK_w, -1, 0, toggle_bar},
			    {XK_K, 0, 0, kill_window},
			    {XK_k, 0, 0, delete_window},
			    {XK_quoteright, -1, 0, goto_win_by_name},
			    {XK_A, -1, 0, rename_current_window},
			    {XK_a, -1, 0, show_clock},
			    {XK_g, ControlMask, 0, abort_keypress},
			    {XK_0, -1, (void*)0, goto_window_number},
			    {XK_1, -1, (void*)1, goto_window_number},
			    {XK_2, -1, (void*)2, goto_window_number},
			    {XK_3, -1, (void*)3, goto_window_number},
			    {XK_4, -1, (void*)4, goto_window_number},
			    {XK_5, -1, (void*)5, goto_window_number},
			    {XK_6, -1, (void*)6, goto_window_number},
			    {XK_7, -1, (void*)7, goto_window_number},
			    {XK_8, -1, (void*)8, goto_window_number},
			    {XK_9, -1, (void*)9, goto_window_number},
			    {XK_m, -1, 0, maximize},
			    { 0, 0, 0, 0 } };

void
prev_window (void *data)
{
  rp_window *new_win = (rp_window *)data;

  if (new_win == NULL) new_win = rp_current_window;
  if (new_win != NULL)
    {
      new_win = new_win->prev;
      if (new_win == NULL) 
	new_win = rp_window_tail;
      if (new_win->state == STATE_UNMAPPED) 
	prev_window (new_win);
      else
	{
	  if (rp_current_window == new_win)
	    display_msg_in_bar (&screens[0], MESSAGE_NO_OTHER_WINDOW);
	  else
	    set_active_window (new_win);
	}
    }
  else
    {
      display_msg_in_bar (&screens[0], MESSAGE_NO_MANAGED_WINDOWS);      
    }
}


void
next_window (void *data)
{
  rp_window *new_win = (rp_window *)data;

  if (new_win == NULL) new_win = rp_current_window;
  if (new_win != NULL)
    {
      new_win = new_win->next;
      if (new_win == NULL) 
	new_win = rp_window_head;
      if (new_win->state == STATE_UNMAPPED) 
	next_window (new_win);
      else
	{
	  if (rp_current_window == new_win)
	    display_msg_in_bar (&screens[0], MESSAGE_NO_OTHER_WINDOW);
	  else
	    set_active_window (new_win);
	}
    }
  else
    {
      display_msg_in_bar (&screens[0], MESSAGE_NO_MANAGED_WINDOWS);
    }
}


void
last_window (void *data)
{
  rp_window *oldwin = rp_current_window;

  /* what happens if find_last_accessed_window() returns something
     funky? (rcy) */
  set_active_window (find_last_accessed_window ());

  if (rp_current_window == oldwin)
    {
      display_msg_in_bar (&screens[0], MESSAGE_NO_OTHER_WINDOW);
    }
}


void
goto_win_by_name (void *data)
{
  char winname[100];
  
  if (rp_current_window == NULL) return;

  get_input (rp_current_window->scr, MESSAGE_PROMPT_GOTO_WINDOW_NAME, winname, 100);
  PRINT_DEBUG ("user entered: %s\n", winname);

  goto_window_name (winname);
}

void
rename_current_window (void *data)
{
  char winname[100];
  
  if (rp_current_window == NULL) return;

  get_input (rp_current_window->scr, MESSAGE_PROMPT_NEW_WINDOW_NAME, winname, 100);
  PRINT_DEBUG ("user entered: %s\n", winname);

  if (*winname)
    {
      free (rp_current_window->name);
      rp_current_window->name = malloc (sizeof (char) * strlen (winname) + 1);
      if (rp_current_window->name == NULL)
	{
	  PRINT_ERROR ("Out of memory\n");
	  exit (EXIT_FAILURE);
	}

      strcpy (rp_current_window->name, winname);

      rp_current_window->named = 1;
  
      /* Update the program bar. */
      update_window_names (rp_current_window->scr);
    }
}


void
delete_window (void *data)
{
  XEvent ev;
  int status;

  if (rp_current_window == NULL) return;

  ev.xclient.type = ClientMessage;
  ev.xclient.window = rp_current_window->w;
  ev.xclient.message_type = wm_protocols;
  ev.xclient.format = 32;
  ev.xclient.data.l[0] = wm_delete;
  ev.xclient.data.l[1] = CurrentTime;

  status = XSendEvent(dpy, rp_current_window->w, False, 0, &ev);
  if (status == 0) fprintf(stderr, "ratpoison: delete window failed\n");
}

void 
kill_window (void *data)
{
  if (rp_current_window == NULL) return;

  XKillClient(dpy, rp_current_window->w);
}

void
execute_command (void *data)
{
  char cmd[100];

  if (rp_current_window)
    {
      get_input (rp_current_window->scr, "Command: ", cmd, 100);
    }
  else
    {
      /* FIXME: We can always assume there is 1 screen, but which one
	 is the active one? Need to test on multi-screen x-servers. */  
    get_input (&screens[0], "Command: ", cmd, 100);
    }

  PRINT_DEBUG ("user entered: %s\n", cmd);

  spawn (cmd);
}

void
spawn(void *data)
{
  char *prog = data;
  /*
   * ugly dance to avoid leaving zombies.  Could use SIGCHLD,
   * but it's not very portable.
   */
  if (fork() == 0) {
    if (fork() == 0) {
      putenv(DisplayString(dpy));
      execlp(prog, prog, 0);

      PRINT_ERROR ("exec %s ", prog); 
      perror(" failed");

      exit(EXIT_FAILURE);
    }
    exit(0);
  }
  wait((int *) 0);
  PRINT_DEBUG ("spawned %s\n", prog);
}

/* Switch to a different Window Manager. Thanks to 
"Chr. v. Stuckrad" <stucki@math.fu-berlin.de> for the patch. */
void
switch_to(void *which)
{
  char *prog=(char *)which;

  PRINT_DEBUG ("Switching to %s\n", prog);

  putenv(DisplayString(dpy)); 
  execlp(prog, prog, 0);

  PRINT_ERROR ("exec %s ", prog);
  perror(" failed");
}

/* Quit ratpoison. Thanks to 
"Chr. v. Stuckrad" <stucki@math.fu-berlin.de> for the patch. */
void
bye(void *dummy)
{
  PRINT_DEBUG ("Exiting\n");
  clean_up ();
  exit (EXIT_SUCCESS);
}

/* Show the current time on the bar. Thanks to 
   Martin Samuelsson <cosis@lysator.liu.se> for the patch. */
void
show_clock (void *data)
{
  screen_info *s;
  char *msg;
  time_t timep;
 
  msg = malloc(9);
  if(msg == NULL)
    {
      PRINT_DEBUG ("Error allocation memory in show_clock()\n");
      return;
    }
 
  timep = time(NULL);
  if(timep == ((time_t)-1))
    {
      perror("In show_clock() ");
      return;
    }
 
  strncpy(msg, ctime(&timep) + 11, 8); /* FIXME: a little bit hardcoded looking */
  msg[8] = '\0';
 
  if (rp_current_window) 
    {
      s = rp_current_window->scr;
      display_msg_in_bar (s, msg);
    }
  free(msg);
}

void
goto_window_number (void *data)
{
  int n = (int)data;

  rp_window *win;

  if ((win = find_window_by_number (n)) == NULL)
    {
      /* Display window list to indicate failure. */
      /* FIXME: We can always assume there is 1 screen, but which one
	 is the active one? Need to test on multi-screen x-servers. */
      show_bar (&screens[0]);
      return;
    }

  set_active_window (win);
}

/* Toggle the display of the program bar */
void
toggle_bar (void *data)
{
  screen_info *s;

  if (rp_current_window)
    s = rp_current_window->scr;
  else
    s = &screens[0];

  if (!hide_bar (s)) show_bar (s);
}


void
abort_keypress (void *data)
{
}  

/* Send the current window the prefix key event */
void
generate_prefix (void *data)
{
  XEvent ev;
  ev = *rp_current_event;

  ev.xkey.window = rp_current_window->w;
  ev.xkey.state = MODIFIER_PREFIX;
  XSendEvent (dpy, rp_current_window->w, False, KeyPressMask, &ev);
  XSync (dpy, False);
}


/* Set a transient window's x,y,width,height fields to maximize the
   window. */
static void
maximize_transient (rp_window *win)
{
  int maxx, maxy;

  /* Honour the window's maximum size */
  if (win->hints->flags & PMaxSize)
    {
      maxx = win->hints->max_width;
      maxy = win->hints->max_height;
    }
  else
    {
      maxx = win->width;
      maxy = win->height;

      /* Make sure we maximize to the nearest Resize Increment specified
	 by the window */
      if (win->hints->flags & PResizeInc)
	{
	  int amount;

	  amount = maxx - win->width;
	  amount -= amount % win->hints->width_inc;
	  PRINT_DEBUG ("amount x: %d\n", amount);
	  maxx = amount + win->width;

	  amount = maxy - win->height;
	  amount -= amount % win->hints->height_inc;
	  PRINT_DEBUG ("amount y: %d\n", amount);
	  maxy = amount + win->height;
	}
    }

  PRINT_DEBUG ("maxsize: %d %d\n", maxx, maxy);

  win->x = PADDING_LEFT - win->width / 2 + (win->scr->root_attr.width - PADDING_LEFT - PADDING_RIGHT) / 2;;
  win->y = PADDING_TOP - win->height / 2 + (win->scr->root_attr.height - PADDING_TOP - PADDING_BOTTOM) / 2;;
  win->width = maxx;
  win->height = maxy;
}

/* set a good standard window's x,y,width,height fields to maximize the window. */
static void
maximize_normal (rp_window *win)
{
  int maxx, maxy;

  int off_x = 0;
  int off_y = 0;

  /* Honour the window's maximum size */
  if (win->hints->flags & PMaxSize)
    {
      maxx = win->hints->max_width;
      maxy = win->hints->max_height;
      
      /* centre the non-maximized window */
/*       off_x = ((win->scr->root_attr.width - PADDING_LEFT - PADDING_RIGHT) - win->hints->max_width) / 2; */
/*       off_y = ((win->scr->root_attr.height - PADDING_TOP - PADDING_BOTTOM) - win->hints->max_height) / 2; */
    }
  else
    {
      maxx = win->scr->root_attr.width - PADDING_LEFT - PADDING_RIGHT;
      maxy = win->scr->root_attr.height - PADDING_TOP - PADDING_BOTTOM;

      /* Make sure we maximize to the nearest Resize Increment specified
	 by the window */
      if (win->hints->flags & PResizeInc)
	{
	  int amount;

	  amount = maxx - win->width;
	  amount -= amount % win->hints->width_inc;
	  PRINT_DEBUG ("amount x: %d\n", amount);
	  maxx = amount + win->width;

	  amount = maxy - win->height;
	  amount -= amount % win->hints->height_inc;
	  PRINT_DEBUG ("amount y: %d\n", amount);
	  maxy = amount + win->height;
	}
    }

  PRINT_DEBUG ("maxsize: %d %d\n", maxx, maxy);

  win->x = PADDING_LEFT + off_x;
  win->y = PADDING_TOP + off_y;
  win->width = maxx;
  win->height = maxy;
}


/* Maximize the current window if data = 0, otherwise assume it is a
   pointer to a window that should be maximized */
void
maximize (void *data)
{
  rp_window *win = (rp_window *)data;

  if (!win) win = rp_current_window;
  if (!win) return;

  /* Handle maximizing transient windows differently */
  if (win->transient) 
    {
      maximize_transient (win);
    }
  else
    {
      maximize_normal (win);
    }

  /* Actually do the maximizing */
  XMoveResizeWindow (dpy, win->w, win->x, win->y, win->width, win->height);

  /* I don't think this should be here, but it doesn't seem to hurt. */
  send_configure (win);

  XSync (dpy, False);
}