/*****************************************************************************

 * window.c: generic window management

 *****************************************************************************

 * Copyright (C) 2009 Laurent Aimar

 * Copyright © 2009-2021 Rémi Denis-Courmont

 *

 * Authors: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser 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.

 *****************************************************************************/

/*****************************************************************************

 * Preamble

 *****************************************************************************/

#ifdef HAVE_CONFIG_H

# include "config.h"

#endif

#include <assert.h>

#include <stdio.h>

#include <stdlib.h>

#include <vlc_common.h>

#include <vlc_window.h>

#include <vlc_modules.h>

#include "inhibit.h"

#include "../libvlc.h"

typedef struct

{

    vlc_window_t wnd;

    vlc_window_cfg_t cfg;

    module_t *module;

    bool inhibit_windowed;

    /* Screensaver inhibition state (protected by lock) */

    vlc_inhibit_t *inhibit;

    bool active;

    bool fullscreen;

    vlc_mutex_t lock;

} window_t;

static int vlc_window_start(void *func, bool forced, va_list ap)

{

    int (*activate)(vlc_window_t *) = func;

    vlc_window_t *wnd = va_arg(ap, vlc_window_t *);

    int ret = activate(wnd);

    if (ret)

        vlc_objres_clear(VLC_OBJECT(wnd));

    (void) forced;

    return ret;

}

vlc_window_t *vlc_window_New(vlc_object_t *obj, const char *module,

                               const vlc_window_owner_t *owner,

                               const vlc_window_cfg_t *restrict cfg)

{

    window_t *w = vlc_custom_create(obj, sizeof(*w), "window");

    vlc_window_t *window = &w->wnd;

    memset(&window->handle, 0, sizeof(window->handle));

    window->info.has_double_click = false;

    window->sys = NULL;

    assert(owner != NULL);

    window->owner = *owner;

    w->cfg.is_fullscreen = false;

    w->cfg.is_decorated = true;

    w->cfg.width = 0;

    w->cfg.height = 0;

    int dss = var_InheritInteger(obj, "disable-screensaver");

    w->inhibit = NULL;

    w->inhibit_windowed = dss == 1;

    w->active = false;

    w->fullscreen = false;

    vlc_mutex_init(&w->lock);

    w->module = vlc_module_load(vlc_object_logger(window), "vout window", module,

                                false, vlc_window_start, window);

    if (!w->module) {

        vlc_object_delete(window);

        return NULL;

    }

    /* Hook for screensaver inhibition */

    if (dss > 0) {

        vlc_inhibit_t *inh = vlc_inhibit_Create(VLC_OBJECT(window));

        vlc_mutex_lock(&w->lock);

        w->inhibit = inh;

        vlc_mutex_unlock(&w->lock);

    }

    /* Apply initial configuration */

    if (cfg != NULL) {

        if (cfg->is_fullscreen)

            vlc_window_SetFullScreen(window, NULL);

        if (cfg->width != 0 && cfg->height != 0)

            vlc_window_SetSize(window, cfg->width, cfg->height);

        /* This will be applied whence the window is enabled. */

        w->cfg.is_decorated = cfg->is_decorated;

    }

    return window;

}

int vlc_window_Enable(vlc_window_t *window)

{

    window_t *w = container_of(window, window_t, wnd);

    if (window->ops->enable != NULL) {

        int err = window->ops->enable(window, &w->cfg);

        if (err)

            return err;

    }

    vlc_window_SetInhibition(window, true);

    return VLC_SUCCESS;

}

void vlc_window_Disable(vlc_window_t *window)

{

    vlc_window_SetInhibition(window, false);

    if (window->ops->disable != NULL)

        window->ops->disable(window);

}

void vlc_window_SetSize(vlc_window_t *window, unsigned width,

                         unsigned height)

{

    window_t *w = container_of(window, window_t, wnd);

    w->cfg.width = width;

    w->cfg.height = height;

    if (window->ops->resize != NULL)

        window->ops->resize(window, width, height);

}

void vlc_window_Delete(vlc_window_t *window)

{

    if (!window)

        return;

    window_t *w = container_of(window, window_t, wnd);

    if (w->inhibit != NULL) {

        vlc_inhibit_t *inh = w->inhibit;

        assert(!w->active);

        vlc_mutex_lock(&w->lock);

        w->inhibit = NULL;

        vlc_mutex_unlock(&w->lock);

        vlc_inhibit_Destroy(inh);

    }

    if (window->ops->destroy != NULL)

        window->ops->destroy(window);

    vlc_objres_clear(VLC_OBJECT(window));

    vlc_object_delete(window);

}

static void vlc_window_UpdateInhibitionUnlocked(vlc_window_t *window)

{

    window_t *w = container_of(window, window_t, wnd);

    unsigned flags = VLC_INHIBIT_NONE;

    vlc_mutex_assert(&w->lock);

    if (w->active && (w->inhibit_windowed || w->fullscreen))

        flags = VLC_INHIBIT_VIDEO;

    if (w->inhibit != NULL)

        vlc_inhibit_Set(w->inhibit, flags);

}

void vlc_window_SetInhibition(vlc_window_t *window, bool enabled)

{

    window_t *w = container_of(window, window_t, wnd);

    vlc_mutex_lock(&w->lock);

    w->active = enabled;

    vlc_window_UpdateInhibitionUnlocked(window);

    vlc_mutex_unlock(&w->lock);

}

void vlc_window_ReportWindowed(vlc_window_t *window)

{

    window_t *w = container_of(window, window_t, wnd);

    if (!w->inhibit_windowed) {

        vlc_mutex_lock(&w->lock);

        w->fullscreen = false;

        vlc_window_UpdateInhibitionUnlocked(window);

        vlc_mutex_unlock(&w->lock);

    }

    if (window->owner.cbs->windowed != NULL)

        window->owner.cbs->windowed(window);

}

void vlc_window_ReportFullscreen(vlc_window_t *window, const char *id)

{

    window_t *w = container_of(window, window_t, wnd);

    if (!w->inhibit_windowed) {

        vlc_mutex_lock(&w->lock);

        w->fullscreen = true;

        vlc_window_UpdateInhibitionUnlocked(window);

        vlc_mutex_unlock(&w->lock);

    }

    if (window->owner.cbs->fullscreened != NULL)

        window->owner.cbs->fullscreened(window, id);

}

void vlc_window_UnsetFullScreen(vlc_window_t *window)

{

    window_t *w = container_of(window, window_t, wnd);

    w->cfg.is_fullscreen = false;

    if (window->ops->unset_fullscreen != NULL)

        window->ops->unset_fullscreen(window);

}

void vlc_window_SetFullScreen(vlc_window_t *window, const char *id)

{

    window_t *w = container_of(window, window_t, wnd);

    w->cfg.is_fullscreen = true;

    if (window->ops->set_fullscreen != NULL)

        window->ops->set_fullscreen(window, id);

}