/* This entire file is licensed under MIT
 *
 * Copyright 2020 William Wold
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * 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 AUTHORS OR COPYRIGHT HOLDERS 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.
 */

#include "xdg-toplevel-surface.h"

#include "custom-shell-surface.h"
#include "gtk-wayland.h"
#include "simple-conversions.h"

#include "xdg-shell-client.h"

#include <gtk/gtk.h>
#include <gdk/gdk.h>
#include <gdk/gdkwayland.h>

struct _XdgToplevelSurface
{
    CustomShellSurface super;

    GdkRectangle cached_allocation;
    GdkRectangle geom;

    // These can be NULL
    struct xdg_surface *xdg_surface;
    struct xdg_toplevel *xdg_toplevel;
};

static void
xdg_surface_handle_configure (void *_data,
                              struct xdg_surface *xdg_surface,
                              uint32_t serial)
{
    (void)_data;

    xdg_surface_ack_configure (xdg_surface, serial);
}

static const struct xdg_surface_listener xdg_surface_listener = {
    .configure = xdg_surface_handle_configure,
};

static void
xdg_toplevel_handle_configure (void *data,
                               struct xdg_toplevel *_xdg_toplevel,
                               int32_t width,
                               int32_t height,
                               struct wl_array *_states)
{
    XdgToplevelSurface *self = data;
    (void)_xdg_toplevel;
    (void)_states;

    // Technically this should not be applied until we get a xdg_surface.configure
    if (width > 0 || height > 0) {
        GtkWindow *gtk_window = custom_shell_surface_get_gtk_window ((CustomShellSurface *)self);
        gtk_window_resize (gtk_window, width, height);
    }
    // Ignore the states
}

static void
xdg_toplevel_handle_close (void *data,
                           struct xdg_toplevel *_xdg_toplevel)
{
    XdgToplevelSurface *self = data;
    (void)_xdg_toplevel;

    GtkWindow *gtk_window = custom_shell_surface_get_gtk_window ((CustomShellSurface *)self);
    gtk_window_close (gtk_window);
}

static const struct xdg_toplevel_listener xdg_toplevel_listener = {
    .configure = xdg_toplevel_handle_configure,
    .close = xdg_toplevel_handle_close,
};

static void
xdg_toplevel_surface_map (CustomShellSurface *super, struct wl_surface *wl_surface)
{
    XdgToplevelSurface *self = (XdgToplevelSurface *)super;

    g_return_if_fail (!self->xdg_toplevel);
    g_return_if_fail (!self->xdg_surface);

    struct xdg_wm_base *xdg_wm_base_global = gtk_wayland_get_xdg_wm_base_global ();
    g_return_if_fail (xdg_wm_base_global);

    self->xdg_surface = xdg_wm_base_get_xdg_surface (xdg_wm_base_global, wl_surface);
    g_return_if_fail (self->xdg_surface);
    xdg_surface_add_listener (self->xdg_surface, &xdg_surface_listener, self);

    self->xdg_toplevel = xdg_surface_get_toplevel (self->xdg_surface);

    // name is either static or managed by the window widget
    const char *name = gtk_window_get_title (custom_shell_surface_get_gtk_window (super));
    if (name == NULL)
        name = "gtk-layer-shell";
    xdg_toplevel_set_title (self->xdg_toplevel, name);

    GtkWindow *gtk_window = custom_shell_surface_get_gtk_window (super);
    self->geom = gtk_wayland_get_logical_geom (gtk_window);
    xdg_surface_set_window_geometry (self->xdg_surface,
                                     self->geom.x,
                                     self->geom.y,
                                     self->geom.width,
                                     self->geom.height);
    xdg_toplevel_add_listener (self->xdg_toplevel, &xdg_toplevel_listener, self);
}

static void
xdg_toplevel_surface_unmap (CustomShellSurface *super)
{
    XdgToplevelSurface *self = (XdgToplevelSurface *)super;

    if (self->xdg_toplevel) {
        xdg_toplevel_destroy (self->xdg_toplevel);
        self->xdg_toplevel = NULL;
    }

    if (self->xdg_surface) {
        xdg_surface_destroy (self->xdg_surface);
        self->xdg_surface = NULL;
    }
}

static void
xdg_toplevel_surface_finalize (CustomShellSurface *super)
{
    xdg_toplevel_surface_unmap (super);
}

static struct xdg_popup *
xdg_toplevel_surface_get_popup (CustomShellSurface *super,
                             struct xdg_surface *popup_xdg_surface,
                             struct xdg_positioner *positioner)
{
    XdgToplevelSurface *self = (XdgToplevelSurface *)super;

    if (!self->xdg_surface) {
        g_critical ("xdg_toplevel_surface_get_popup () called when the xdg surface wayland object has not yet been created");
        return NULL;
    }

    return xdg_surface_get_popup (popup_xdg_surface, self->xdg_surface, positioner);
}

static GdkRectangle
xdg_toplevel_surface_get_logical_geom (CustomShellSurface *super)
{
    XdgToplevelSurface *self = (XdgToplevelSurface *)super;
    return self->geom;
}

static const CustomShellSurfaceVirtual xdg_toplevel_surface_virtual = {
    .map = xdg_toplevel_surface_map,
    .unmap = xdg_toplevel_surface_unmap,
    .finalize = xdg_toplevel_surface_finalize,
    .get_popup = xdg_toplevel_surface_get_popup,
    .get_logical_geom = xdg_toplevel_surface_get_logical_geom,
};

static void
xdg_toplevel_surface_on_size_allocate (GtkWidget *_widget,
                                       GdkRectangle *allocation,
                                       XdgToplevelSurface *self)
{
    (void)_widget;

    if (self->xdg_surface && !gdk_rectangle_equal (&self->cached_allocation, allocation)) {
        self->cached_allocation = *allocation;
        // allocation only used for catching duplicate calls. To get the correct geom we need to check something else
        GtkWindow *gtk_window = custom_shell_surface_get_gtk_window ((CustomShellSurface *)self);
        self->geom = gtk_wayland_get_logical_geom (gtk_window);
        xdg_surface_set_window_geometry (self->xdg_surface,
                                         self->geom.x,
                                         self->geom.y,
                                         self->geom.width,
                                         self->geom.height);
    }
}

XdgToplevelSurface *
xdg_toplevel_surface_new (GtkWindow *gtk_window)
{
    g_return_val_if_fail (gtk_wayland_get_xdg_wm_base_global (), NULL);

    XdgToplevelSurface *self = g_new0 (XdgToplevelSurface, 1);
    self->super.virtual = &xdg_toplevel_surface_virtual;
    custom_shell_surface_init ((CustomShellSurface *)self, gtk_window);

    self->cached_allocation = (GdkRectangle) {
        .x = 0,
        .y = 0,
        .width = 0,
        .height = 0,
    };
    self->xdg_surface = NULL;
    self->xdg_toplevel = NULL;

    gtk_window_set_decorated (gtk_window, FALSE);
    g_signal_connect (gtk_window, "size-allocate", G_CALLBACK (xdg_toplevel_surface_on_size_allocate), self);

    return self;
}

XdgToplevelSurface *
custom_shell_surface_get_xdg_toplevel (CustomShellSurface *shell_surface)
{
    if (shell_surface && shell_surface->virtual == &xdg_toplevel_surface_virtual)
        return (XdgToplevelSurface *)shell_surface;
    else
        return NULL;
}

