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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <malloc.h>
#include <X11/Xlib.h>
#include <time.h>

typedef struct s_elock_win_item
{
    Window                  win;
    time_t                  create_time;
    struct s_elock_win_item *next;
} t_elock_win_item;

typedef struct s_elock_win_list
{
    Display                *disp;
    struct s_elock_win_item *first;
    struct s_elock_win_item *last;
} t_elock_win_list;

t_elock_win_list        list;

Display                *elock_open_display ();
void                    elock_error (char *message);
void                    elock_echo (char *message);
t_elock_win_list       *elock_init_list ();
static void             elock_add_to_list (Window win);
static void             elock_select_events (Window wind, Bool substructureOnly);


Display                *elock_open_display ()
{
    Display                *disp;

	printf ("> elock_open_display\n");

    disp = XOpenDisplay (getenv ("DISPLAY"));

    if (disp == NULL)
    {
        fprintf (stderr, "Can't open Display\n");
        exit (1);
    }
    fprintf (stdout, "DISPLAY OPENED\n");
	printf ("< elock_open_display\n");

    return disp;
}

void elock_error (char *message)
{
    fprintf (stderr, "%s\n", message);
    exit (1);
}

void elock_echo (char *message)
{
    fprintf (stdout, "%s\n", message);
    return;
}

t_elock_win_list       *elock_init_list ()
{
    int                     loop;
    t_elock_win_list        list;

	printf ("> elock_init_list\n");

    list.disp = elock_open_display ();
    list.first = 0;
    list.last = 0;

    for (loop = -1; ++loop < ScreenCount (list.disp);)
    {
        Window                  root = RootWindowOfScreen (ScreenOfDisplay (list.disp, loop));

        elock_add_to_list (root);
        elock_select_events (root, True);
    }
    t_elock_win_list       *p_list = &list;
	
	printf ("< elock_init_list\n");

    return p_list;
}

static void elock_add_to_list (Window win)
{
    t_elock_win_item       *new_win_item = malloc (sizeof (t_elock_win_item));

	printf ("> elock_add_to_list\n");

    if (new_win_item == NULL)
        elock_error ("MALLOC ERROR");

    new_win_item->win = win;
    new_win_item->create_time = time (0);
    new_win_item->next = 0;

    if (!list.first)
    {
        list.first = new_win_item;
    }
    if (list.last)
    {
        list.last->next = new_win_item;
    }

	printf ("< elock_add_to_list\n");

    list.last = new_win_item;
}

static void elock_select_events (Window wind, Bool substructureOnly)
{
    Window                  elock_root;
    Window                  elock_parent;
    Window                 *elock_child;
    unsigned                elock_nb_child = 0;
    unsigned                loop_count;
    XWindowAttributes       attribs;

	printf ("> elock_select_events\n");

    if (!XQueryTree (list.disp, wind, &elock_root, &elock_parent, &elock_child, &elock_nb_child))
    {
        elock_error ("XQueryTree ERROR");
    }

    if (elock_nb_child)
	{
		printf ("elock_nb_child EXIST\n");
        XFree ((char *)elock_child);
	}

    if (substructureOnly)
	{
		printf ("substructureOnly EXIST\n");
        XSelectInput (list.disp, wind, SubstructureNotifyMask);
	}
    else
    {
		printf ("substructureOnly DOESN'T EXIST\n");
        if (elock_parent == None)
        {
			printf ("elock_parent == None\n");
            attribs.all_event_masks = attribs.do_not_propagate_mask = KeyPressMask;
        }
        else if (!XGetWindowAttributes (list.disp, wind, &attribs))
        {
            elock_error ("XGetWindowAttributes ERROR");
        }
        XSelectInput (list.disp,
                      wind,
                      SubstructureNotifyMask |
                      ((attribs.all_event_masks | attribs.do_not_propagate_mask) & KeyPressMask));
    }

    if (!XQueryTree (list.disp, wind, &elock_root, &elock_parent, &elock_child, &elock_nb_child))
    {
        elock_error ("XQueryTree ERROR");
    }

    for (loop_count = 0; loop_count < elock_nb_child; ++loop_count)
    {
		printf (">> for\n");
        elock_select_events (elock_child[loop_count], substructureOnly);
    }

    if (elock_nb_child)
	{
		printf ("elock_nb_child EXIST\n");
        XFree ((char *)elock_child);
	}

	printf ("< elock_select_events\n");

}


int main ()
{
    elock_init_list ();

	return 0;
}