/*
 * layout.c - layout management
 *
 * Copyright © 2007-2008 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 <xcb/xcb.h>
#include <xcb/xcb_atom.h>
#include <xcb/xcb_aux.h>

#include "tag.h"
#include "focus.h"
#include "widget.h"
#include "window.h"
#include "client.h"
#include "screen.h"
#include "layouts/tile.h"
#include "layouts/max.h"
#include "layouts/fibonacci.h"
#include "layouts/floating.h"

extern AwesomeConf globalconf;

#include "layoutgen.h"

/** Arrange windows following current selected layout
 * \param screen the screen to arrange
 */
static void
arrange(int screen)
{
    Client *c;
    Layout *curlay = layout_get_current(screen);
    int phys_screen = screen_virttophys(screen);
    xcb_query_pointer_cookie_t qp_c;
    xcb_query_pointer_reply_t *qp_r;

    qp_c = xcb_query_pointer_unchecked(globalconf.connection,
                                       xcb_aux_get_screen(globalconf.connection,
                                                          phys_screen)->root);

    for(c = globalconf.clients; c; c = c->next)
    {
        if(client_isvisible(c, screen) && !c->newcomer)
            client_unban(c);
        /* we don't touch other screens windows */
        else if(c->screen == screen || c->newcomer)
            client_ban(c);
    }

    curlay->arrange(screen);

    for(c = globalconf.clients; c; c = c->next)
        if(c->newcomer && client_isvisible(c, screen))
        {
            c->newcomer = false;
            client_unban(c);
            if(globalconf.screens[screen].new_get_focus
               && !c->skip
               && (!globalconf.focus->client || !globalconf.focus->client->ismax))
                client_focus(c, screen, true);
            else if(globalconf.focus->client && globalconf.focus->client->ismax)
                client_stack(globalconf.focus->client);
        }

    /* if we have a valid client that could be focused but currently no window
     * are focused, then set the focus on this window */
    if((c = focus_get_current_client(screen)) && globalconf.focus->client != c)
        client_focus(c, screen, true);

    /* check that the mouse is on a window or not */
    if((qp_r = xcb_query_pointer_reply(globalconf.connection, qp_c, NULL)))
    {
        if(qp_r->root == XCB_NONE || qp_r->child == XCB_NONE || qp_r->root == qp_r->child)
            window_root_grabbuttons(phys_screen);

        globalconf.pointer_x = qp_r->root_x;
        globalconf.pointer_y = qp_r->root_y;
        p_delete(&qp_r);
    }

    /* reset status */
    globalconf.screens[screen].need_arrange = false;
}

/** Refresh the screen disposition
 * \return true if the screen was arranged, false otherwise
 */
int
layout_refresh(void)
{
    int screen;
    int arranged = 0;

    for(screen = 0; screen < globalconf.screens_info->nscreen; screen++)
        if(globalconf.screens[screen].need_arrange)
        {
            arrange(screen);
            arranged++;
        }

    return arranged;
}

/** Get current layout used on screen
 * \param screen screen id
 * \return layout used on that screen
 */
Layout *
layout_get_current(int screen)
{
    Tag **curtags = tags_get_current(screen);
    Layout *l = curtags[0]->layout;
    p_delete(&curtags);
    return l;
}

/** Set the layout of the current tag.
 * Argument must be a relative or absolute integer of available layouts.
 * \param screen Screen ID
 * \param arg Layout specifier
 * \ingroup ui_callback
 */
void
uicb_tag_setlayout(int screen, char *arg)
{
    Layout *l = globalconf.screens[screen].layouts;
    Tag *tag, **curtags;
    int i;

    if(arg)
    {
        curtags = tags_get_current(screen);
        for(i = 0; l && l != curtags[0]->layout; i++, l = l->next);
        p_delete(&curtags);

        if(!l)
            i = 0;

        i = compute_new_value_from_arg(arg, (double) i);

        if(i >= 0)
            for(l = globalconf.screens[screen].layouts; l && i > 0; i--)
                 l = l->next;
        else
            for(l = globalconf.screens[screen].layouts; l && i < 0; i++)
                 l = layout_list_prev_cycle(&globalconf.screens[screen].layouts, l);

        if(!l)
            l = globalconf.screens[screen].layouts;
    }

    for(tag = globalconf.screens[screen].tags; tag; tag = tag->next)
        if(tag->selected)
            tag->layout = l;

    if(globalconf.focus->client)
        arrange(screen);

    widget_invalidate_cache(screen, WIDGET_CACHE_LAYOUTS);
}

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