/* $Xorg: choose.c,v 1.4 2001/02/09 02:05:59 xorgcvs Exp $ */
/******************************************************************************

Copyright 1993, 1998  The Open Group

Permission to use, copy, modify, distribute, and sell this software and its
documentation for any purpose is hereby granted without fee, provided that
the above copyright notice appear in all copies and that both that
copyright notice and this permission notice appear in supporting
documentation.

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of The Open Group shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from The Open Group.
******************************************************************************/
/* $XFree86: xc/programs/xsm/choose.c,v 1.6tsi Exp $ */

#include "xsm.h"
#include "saveutil.h"
#include "lock.h"
#include "choose.h"
#include <sys/types.h>

#include <X11/Shell.h>
#include <X11/Xaw/Form.h>
#include <X11/Xaw/List.h>
#include <X11/Xaw/Command.h>

#ifndef X_NOT_POSIX
#include <dirent.h>
#else
#ifdef SYSV
#include <dirent.h>
#else
#ifdef USG
#include <dirent.h>
#else
#include <sys/dir.h>
#ifndef dirent
#define dirent direct
#endif
#endif
#endif
#endif

static Pixel save_message_foreground;
static Pixel save_message_background;

static int delete_session_phase = 0;
static int break_lock_phase = 0;

static Widget chooseSessionPopup;
static Widget chooseSessionForm;
static Widget chooseSessionLabel;
static Widget chooseSessionListWidget;
static Widget chooseSessionMessageLabel;
static Widget chooseSessionLoadButton;
static Widget chooseSessionDeleteButton;
static Widget chooseSessionBreakLockButton;
static Widget chooseSessionFailSafeButton;
static Widget chooseSessionCancelButton;



int
GetSessionNames(int *count_ret, String **short_names_ret, 
		String **long_names_ret, Bool **locked_ret)
{
    DIR *dir;
    struct dirent *entry;
    const char *path;
    int count;

    path = getenv ("SM_SAVE_DIR");
    if (!path)
    {
	path = getenv ("HOME");
	if (!path)
	    path = ".";
    }
    
    *count_ret = 0;
    *short_names_ret = NULL;
    *locked_ret = NULL;
    if (long_names_ret)
	*long_names_ret = NULL;

    if ((dir = opendir (path)) == NULL)
	return 0;

    fcntl(dirfd(dir), F_SETFD, FD_CLOEXEC);

    count = 0;

    while ((entry = readdir (dir)) != NULL)
    {
	if (strncmp (entry->d_name, ".XSM-", 5) == 0)
	    count++;
    }

    if (count == 0 ||
       ((*short_names_ret = (String *) XtMalloc (
           count * sizeof (String))) == NULL) ||
       (long_names_ret && (*long_names_ret =
           (String *) XtMalloc (count * sizeof (String))) == NULL) ||
       ((*locked_ret = (Bool *) XtMalloc (count * sizeof (Bool))) == NULL))
    {
	closedir (dir);
	if (*short_names_ret)
	    XtFree ((char *) *short_names_ret);
	if (long_names_ret && *long_names_ret)
	    XtFree ((char *) *long_names_ret);
	return 0;
    }

    rewinddir (dir);

    while ((entry = readdir (dir)) != NULL && *count_ret < count)
    {
	if (strncmp (entry->d_name, ".XSM-", 5) == 0)
	{
	    char *name = (char *) entry->d_name + 5;
	    char *id = NULL;
	    Bool locked = CheckSessionLocked (name, long_names_ret!=NULL, &id);

	    (*short_names_ret)[*count_ret] = XtNewString (name);
	    (*locked_ret)[*count_ret] = locked;

	    if (long_names_ret)
	    {
		if (!locked)
		{
		    (*long_names_ret)[*count_ret] =
			(*short_names_ret)[*count_ret];
		}
		else
		{
		    char *host = ((char *) strchr (id, '/')) + 1;
		    char *colon = (char *) strrchr (host, ':');
		    char *lockmsg;

		    /* backtrack over previous colon if there are 2 (DECnet),
		       but not three (IPv6) */
		    if ((*(colon - 1) == ':') && (*(colon - 2) != ':'))
			colon--;

		    *colon = '\0';

		    XtAsprintf (&lockmsg, "%s (locked at %s)", name, host);
		    (*long_names_ret)[*count_ret] = lockmsg;
		    *colon = ':';

		    XtFree (id);
		}
	    }

	    (*count_ret)++;
	}
    }

    closedir (dir);

    return 1;
}



void
FreeSessionNames(int count, String *namesShort, String *namesLong, 
		 Bool *lockFlags)
{
    int i;

    for (i = 0; i < count; i++)
	XtFree ((char *) namesShort[i]);
    XtFree ((char *) namesShort);

    if (namesLong)
    {
	for (i = 0; i < count; i++)
	    if (lockFlags[i])
		XtFree ((char *) namesLong[i]);
	XtFree ((char *) namesLong);
    }

    XtFree ((char *) lockFlags);
}



static void
SessionSelected(int number, Bool highlight)
{
    if (number >= 0)
    {
	Bool locked = sessionsLocked[number];

	if (highlight)
	    XawListHighlight (chooseSessionListWidget, number);

	XtSetSensitive (chooseSessionLoadButton, !locked);
	XtSetSensitive (chooseSessionDeleteButton, !locked);
	XtSetSensitive (chooseSessionBreakLockButton, locked);
    }
    else
    {
	XtSetSensitive (chooseSessionLoadButton, False);
	XtSetSensitive (chooseSessionDeleteButton, False);
	XtSetSensitive (chooseSessionBreakLockButton, False);
    }
}



static void
AddSessionNames(int count, String *names)
{
    int i;

    XawListChange (chooseSessionListWidget, names, count, 0, True);

    /*
     * Highlight the first unlocked session, if any.
     */

    for (i = 0; i < sessionNameCount; i++)
	if (!sessionsLocked[i])
	    break;

    SessionSelected (i < sessionNameCount ? i : -1, True);
}



void
ChooseWindowStructureNotifyXtHandler(Widget w, XtPointer closure, 
				     XEvent *event, 
				     Boolean *continue_to_dispatch)
{
    if (event->type == MapNotify)
    {
	/*
	 * Set the input focus to the choose window and direct all keyboard
	 * events to the list widget.  This way, the user can make selections
	 * using the keyboard.
	 */

	XtSetKeyboardFocus (chooseSessionPopup, chooseSessionListWidget);

	XSetInputFocus (XtDisplay (topLevel), XtWindow (chooseSessionPopup),
	    RevertToPointerRoot, CurrentTime);

	XSync (XtDisplay (topLevel), 0);

	XtRemoveEventHandler (chooseSessionPopup, StructureNotifyMask, False,
	    ChooseWindowStructureNotifyXtHandler, NULL);
    }
}


void
ChooseSession(void)
{
    Dimension   width, height;
    Position	x, y;


    /*
     * Add the session names to the list
     */

    AddSessionNames (sessionNameCount, sessionNamesLong);


    /*
     * Center popup containing choice of sessions
     */
    
    XtRealizeWidget (chooseSessionPopup);

    XtVaGetValues (chooseSessionPopup,
	XtNwidth, &width,
	XtNheight, &height,
	NULL);

    x = (Position)(WidthOfScreen (XtScreen (topLevel)) - width) / 2;
    y = (Position)(HeightOfScreen (XtScreen (topLevel)) - height) / 3;

    XtVaSetValues (chooseSessionPopup,
	XtNx, x,
	XtNy, y,
	NULL);

    XtVaSetValues (chooseSessionListWidget,
	XtNlongest, width,
	NULL);

    XtVaSetValues (chooseSessionLabel,
	XtNwidth, width,
	NULL);

    XtVaGetValues (chooseSessionMessageLabel,
	XtNforeground, &save_message_foreground,
	XtNbackground, &save_message_background,
	NULL);

    XtVaSetValues (chooseSessionMessageLabel,
	XtNwidth, width,
	XtNforeground, save_message_background,
	NULL);

    /*
     * Wait for a map notify on the popup, then set input focus.
     */

    XtAddEventHandler (chooseSessionPopup, StructureNotifyMask, False,
	ChooseWindowStructureNotifyXtHandler, NULL);

    XtPopup (chooseSessionPopup, XtGrabNone);
}



static void
CheckDeleteCancel (void)
{
    if (delete_session_phase > 0)
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_background,
            NULL);

	delete_session_phase = 0;
    }
}


static void
CheckBreakLockCancel(void)
{
    if (break_lock_phase > 0)
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_background,
            NULL);

	break_lock_phase = 0;
    }
}



static void
ChooseSessionUp(Widget w, XEvent *event, String *params, Cardinal *numParams)
{
    XawListReturnStruct *current;
    
    CheckDeleteCancel ();
    CheckBreakLockCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);
    if (current->list_index > 0)
	SessionSelected (current->list_index - 1, True);
    XtFree ((char *) current);
}


static void
ChooseSessionDown(Widget w, XEvent *event, String *params, Cardinal *numParams)
{
    XawListReturnStruct *current;
    
    CheckDeleteCancel ();
    CheckBreakLockCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);
    if (current->list_index < sessionNameCount - 1)
	SessionSelected (current->list_index + 1, True);
    XtFree ((char *) current);
}



static void
ChooseSessionBtn1Down(Widget w, XEvent *event, String *params, 
		      Cardinal *numParams)
{
    XawListReturnStruct *current;

    CheckDeleteCancel ();
    CheckBreakLockCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);
    SessionSelected (current->list_index, False /* already highlighted */);
    XtFree ((char *) current);
}



static void
ChooseSessionLoadXtProc(Widget w, XtPointer client_data, XtPointer callData)
{
    XawListReturnStruct *current;

    CheckDeleteCancel ();
    CheckBreakLockCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);

    if (!current || !current->string || *(current->string) == '\0')
    {
	if (current)
	    XtFree ((char *) current);
#ifdef XKB
	XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_BadValue);
#else
	XBell (XtDisplay (topLevel), 0);
#endif
	return;
    }

    /*
     * Pop down choice of sessions and start the specified session.
     */

    XtPopdown (chooseSessionPopup);

    if (session_name)
	XtFree (session_name);

    session_name = XtNewString (current->string);

    XtFree ((char *) current);

    FreeSessionNames (sessionNameCount,
	sessionNamesShort, sessionNamesLong, sessionsLocked);


    /*
     * Start the session, looking for .XSM-<session name> startup file.
     */

    if (!StartSession (session_name, False))
	UnableToLockSession (session_name);
}



static void
ChooseSessionDeleteXtProc(Widget w, XtPointer client_data, XtPointer callData)
{
    XawListReturnStruct *current;
    int longest;
    char *name;

    CheckBreakLockCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);

    if (!current || !(name = current->string) || *name == '\0')
    {
	if (current)
	    XtFree ((char *) current);
#ifdef XKB
	XkbStdBell(XtDisplay(w),XtWindow(w),0,XkbBI_BadValue);
#else
	XBell (XtDisplay (topLevel), 0);
#endif
	return;
    }

    delete_session_phase++;

    if (delete_session_phase == 1)
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_foreground,
            NULL);

#ifdef XKB
	XkbStdBell(XtDisplay(w),XtWindow(w),0,XkbBI_BadValue);
#else
	XBell (XtDisplay (topLevel), 0);
#endif
    }
    else
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_background,
            NULL);

	if (DeleteSession (name))
	{
	    int i, j;

	    for (i = 0; i < sessionNameCount; i++)
	    {
		if (strcmp (sessionNamesLong[i], name) == 0)
		{
		    XtFree ((char *) sessionNamesShort[i]);

		    if (sessionsLocked[i])
			XtFree ((char *) sessionNamesLong[i]);

		    for (j = i; j < sessionNameCount - 1; j++)
		    {
			sessionNamesLong[j] = sessionNamesLong[j + 1];
			sessionNamesShort[j] = sessionNamesShort[j + 1];
			sessionsLocked[j] = sessionsLocked[j + 1];
		    }
		    sessionNameCount--;
		    break;
		}
	    }

	    if (sessionNameCount == 0)
	    {
		XtSetSensitive (chooseSessionLoadButton, 0);
		XtSetSensitive (chooseSessionDeleteButton, 0);
		XtUnmanageChild (chooseSessionListWidget);
	    }
	    else
	    {
		XtVaGetValues (chooseSessionListWidget,
		    XtNlongest, &longest,
		    NULL);

		XawListChange (chooseSessionListWidget,
		    sessionNamesLong, sessionNameCount, longest, True);

		SessionSelected (-1, False);
	    }
	}

	delete_session_phase = 0;
    }

    XtFree ((char *) current);
}



static void
ChooseSessionBreakLockXtProc(Widget w, XtPointer client_data, 
			     XtPointer callData)
{
    XawListReturnStruct *current;
    char *name;

    CheckDeleteCancel ();

    current = XawListShowCurrent (chooseSessionListWidget);

    if (!current || !(name = current->string) || *name == '\0')
    {
	if (current)
	    XtFree ((char *) current);
#ifdef XKB
	XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_BadValue);
#else
	XBell (XtDisplay (topLevel), 0);
#endif
	return;
    }

    break_lock_phase++;

    if (break_lock_phase == 1)
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_foreground,
            NULL);

#ifdef XKB
	XkbStdBell(XtDisplay(topLevel),XtWindow(topLevel),0,XkbBI_BadValue);
#else
	XBell (XtDisplay (topLevel), 0);
#endif
    }
    else
    {
	int longest;

	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_background,
            NULL);

	name = sessionNamesShort[current->list_index];

	(void) GetLockId (name);

	UnlockSession (name);

	sessionsLocked[current->list_index] = False;
	XtFree ((char *) sessionNamesLong[current->list_index]);
	sessionNamesLong[current->list_index] =
	    sessionNamesShort[current->list_index];

	XtVaGetValues (chooseSessionListWidget,
	    XtNlongest, &longest,
	    NULL);

	XawListChange (chooseSessionListWidget,
	    sessionNamesLong, sessionNameCount, longest, True);

	SessionSelected (current->list_index, True);

	break_lock_phase = 0;
    }

    XtFree ((char *) current);
}



static void
ChooseSessionFailSafeXtProc(Widget w, XtPointer client_data, 
			    XtPointer callData)
{
    /*
     * Pop down choice of sessions, and start the fail safe session.
     */

    CheckDeleteCancel ();
    CheckBreakLockCancel ();

    XtPopdown (chooseSessionPopup);

    if (session_name)
	XtFree (session_name);

    session_name = XtNewString (FAILSAFE_SESSION_NAME);

    FreeSessionNames (sessionNameCount,
	sessionNamesShort, sessionNamesLong, sessionsLocked);


    /*
     * We don't need to check return value of StartSession in this case,
     * because we are using the default session, and StartSession will
     * not try to lock the session at this time.  It will try to lock
     * it as soon as the user gives the session a name.
     */

    StartSession (session_name,
	True /* Use ~/.xsmstartup if found, else system.xsm */);
}



static void
ChooseSessionCancelXtProc(Widget w, XtPointer client_data, XtPointer callData)
{
    if (delete_session_phase > 0 || break_lock_phase > 0)
    {
	XtVaSetValues (chooseSessionMessageLabel,
	    XtNforeground, save_message_background,
            NULL);

	delete_session_phase = 0;
	break_lock_phase = 0;
    }
    else
	EndSession (2);
}



void
create_choose_session_popup(void)

{
    static XtActionsRec choose_actions[] = {
        {"ChooseSessionUp", ChooseSessionUp},
        {"ChooseSessionDown", ChooseSessionDown},
        {"ChooseSessionBtn1Down", ChooseSessionBtn1Down}
    };

    /*
     * Pop up for choosing session at startup
     */

    chooseSessionPopup = XtVaCreatePopupShell (
	"chooseSessionPopup", transientShellWidgetClass, topLevel,
	XtNallowShellResize, True,
	NULL);
    

    chooseSessionForm = XtVaCreateManagedWidget (
	"chooseSessionForm", formWidgetClass, chooseSessionPopup,
	NULL);


    chooseSessionLabel = XtVaCreateManagedWidget (
	"chooseSessionLabel", labelWidgetClass, chooseSessionForm,
        XtNfromHoriz, NULL,
        XtNfromVert, NULL,
        XtNborderWidth, 0,
	XtNresizable, True,
	XtNjustify, XtJustifyCenter,
	NULL);

    chooseSessionListWidget = XtVaCreateManagedWidget (
	"chooseSessionListWidget", listWidgetClass, chooseSessionForm,
	XtNresizable, True,
        XtNdefaultColumns, 1,
	XtNforceColumns, True,
        XtNfromHoriz, NULL,
        XtNfromVert, chooseSessionLabel,
	XtNvertDistance, 25,
	NULL);

    chooseSessionMessageLabel = XtVaCreateManagedWidget (
	"chooseSessionMessageLabel", labelWidgetClass, chooseSessionForm,
        XtNfromHoriz, NULL,
        XtNfromVert, chooseSessionListWidget,
        XtNborderWidth, 0,
	XtNresizable, True,
	XtNjustify, XtJustifyCenter,
	NULL);

    chooseSessionLoadButton = XtVaCreateManagedWidget (
	"chooseSessionLoadButton", commandWidgetClass, chooseSessionForm,
        XtNfromHoriz, NULL,
        XtNfromVert, chooseSessionMessageLabel,
        NULL);

    XtAddCallback (chooseSessionLoadButton, XtNcallback,
	ChooseSessionLoadXtProc, NULL);

    chooseSessionDeleteButton = XtVaCreateManagedWidget (
	"chooseSessionDeleteButton", commandWidgetClass, chooseSessionForm,
        XtNfromHoriz, chooseSessionLoadButton,
        XtNfromVert, chooseSessionMessageLabel,
        NULL);

    XtAddCallback (chooseSessionDeleteButton, XtNcallback,
	ChooseSessionDeleteXtProc, NULL);

    chooseSessionBreakLockButton = XtVaCreateManagedWidget (
	"chooseSessionBreakLockButton",
	commandWidgetClass, chooseSessionForm,
        XtNfromHoriz, chooseSessionDeleteButton,
        XtNfromVert, chooseSessionMessageLabel,
        NULL);

    XtAddCallback (chooseSessionBreakLockButton, XtNcallback,
	ChooseSessionBreakLockXtProc, NULL);

    chooseSessionFailSafeButton = XtVaCreateManagedWidget (
	"chooseSessionFailSafeButton", commandWidgetClass, chooseSessionForm,
        XtNfromHoriz, chooseSessionBreakLockButton,
        XtNfromVert, chooseSessionMessageLabel,
        NULL);

    XtAddCallback (chooseSessionFailSafeButton, XtNcallback,
	ChooseSessionFailSafeXtProc, NULL);


    chooseSessionCancelButton = XtVaCreateManagedWidget (
	"chooseSessionCancelButton", commandWidgetClass, chooseSessionForm,
        XtNfromHoriz, chooseSessionFailSafeButton,
        XtNfromVert, chooseSessionMessageLabel,
        NULL);

    XtAddCallback (chooseSessionCancelButton, XtNcallback,
	ChooseSessionCancelXtProc, NULL);

    XtAppAddActions (appContext, choose_actions, XtNumber (choose_actions));

    XtInstallAllAccelerators (chooseSessionListWidget, chooseSessionPopup);
}
