/*
 * focus.c - focus management
 *
 * Copyright © 2007 Julien Danjou <julien@danjou.info>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#include "util.h"
#include "tag.h"
#include "focus.h" 
#include "client.h"

extern AwesomeConf globalconf;

static FocusList *
focus_get_node_by_client(Client *c)
{
    FocusList *fl;

    for(fl = globalconf.focus; fl; fl = fl->prev)
        if(fl->client == c)
            return fl;

    return NULL;
}

static FocusList *
focus_detach_node(FocusList *fl)
{
    FocusList *tmp;

    if(globalconf.focus == fl)
        globalconf.focus = fl->prev;
    else
    {
        for(tmp = globalconf.focus; tmp && tmp->prev != fl; tmp = tmp->prev);
        tmp->prev = fl->prev;
    }

    return fl;
}

static FocusList *
focus_attach_node(FocusList *fl)
{
    FocusList *old_head;

    old_head = globalconf.focus;
    globalconf.focus = fl;
    fl->prev = old_head;

    return fl;
}

void
focus_add_client(Client *c)
{
    FocusList *new_fh;

    /* if we don't find this node, create a new one */
    if(!(new_fh = focus_get_node_by_client(c)))
    {
        new_fh = p_new(FocusList, 1);
        new_fh->client = c;
    }
    else /* if we've got a node, detach it */
        focus_detach_node(new_fh);

    focus_attach_node(new_fh);
}

void
focus_delete_client(Client *c)
{
    FocusList *target = focus_get_node_by_client(c);

    if(target)
    {
        focus_detach_node(target);
        p_delete(&target);
    }
}

static Client *
focus_get_latest_client_for_tags(Tag **t, int nindex)
{
    FocusList *fl;
    Tag **tags;
    int i = 0;

    for(fl = globalconf.focus; fl; fl = fl->prev)
        if(fl->client && !fl->client->skip)
            for(tags = t; *tags; tags++)
                if(is_client_tagged(fl->client, *t))
                {
                    if(i == nindex)
                        return fl->client;
                    else
                        i--;
                }

    return NULL;
}

Client *
focus_get_current_client(int screen)
{
    Tag **curtags = get_current_tags(screen);
    Client *sel = focus_get_latest_client_for_tags(curtags, 0);
    p_delete(&curtags);

    return sel;
}

/** Jump in focus history stack
 * \param screen Screen ID
 * \param arg Integer argument
 * \ingroup ui_callback
 */
void
uicb_focus_history(int screen, char *arg)
{
    int i;
    Tag **curtags;
    Client *c;

    if(arg)
    {
        i = atoi(arg);

        if(i < 0)
        {
            curtags = get_current_tags(screen);
            c = focus_get_latest_client_for_tags(curtags, i);
            p_delete(&curtags);
            if(c)
                focus(c, True, screen);
        }
    }
}

void
uicb_focus_client_byname(int screen, char *arg)
{
    Client *c;
    Tag **curtags, **tag;

    if(arg)
    {
        curtags = get_current_tags(screen);
        if((c = get_client_byname(globalconf.clients, arg)))
           for(tag = curtags; *tag; tag++)
               if(is_client_tagged(c, *tag))
                   focus(c, True, screen);
        p_delete(&curtags);
    }
}

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