#ifndef WAYLAND_GTK_EGL_EXAMPLE_H
#define WAYLAND_GTK_EGL_EXAMPLE_H

#define HAS_DBUS
#define HAVE_MEMFD_CREATE
#define HAVE_POSIX_FALLOCATE

#define Min(a, b) ((a)>(b)?(b):(a))
#define Max(a, b) ((a)<(b)?(b):(a))

#define ClampTop(x, a) Min(x, a)
#define ClampBot(x, a) Max(x, a)

typedef enum ColorScheme{
  ColorScheme_Default,
  ColorScheme_Dark,
  ColorScheme_Light
} ColorScheme;

typedef struct CursorTheme{
  char *name;
  int size;
} CursorTheme;

typedef uint32_t CursorShape;
enum{
  CursorShape_Hidden,
  CursorShape_Pointer,
  CursorShape_Resize_Top,
  CursorShape_Resize_Bottom,
  CursorShape_Resize_Left,
  CursorShape_Resize_Right,
  CursorShape_Resize_TopLeft,
  CursorShape_Resize_TopRight,
  CursorShape_Resize_BottomLeft,
  CursorShape_Resize_BottomRight,
  CursorShape_COUNT
};

typedef uint32_t WindowFlags;
enum{
  WindowFlag_IsFullscreen  = (1 << 0),
  WindowFlag_IsMax         = (1 << 1),
  WindowFlag_IsActivated   = (1 << 2),
  WindowFlag_IsTiledLeft   = (1 << 3),
  WindowFlag_IsTiledRight  = (1 << 4),
  WindowFlag_IsTiledTop    = (1 << 5),
  WindowFlag_IsTiledBottom = (1 << 6),
  WindowFlag_IsResizing    = (1 << 7),
  WindowFlag_IsSuspended   = (1 << 8),
  WindowFlag_IsConstrainedLeft   = (1 << 9),
  WindowFlag_IsConstrainedRight  = (1 << 10),
  WindowFlag_IsConstrainedTop    = (1 << 11),
  WindowFlag_IsConstrainedBottom = (1 << 12),
};

#define WindowMask_IsAnchored                      \
(WindowFlag_IsFullscreen|WindowFlag_IsMax|        \
WindowFlag_IsTiledLeft |WindowFlag_IsTiledRight| \
WindowFlag_IsTiledTop  |WindowFlag_IsTiledBottom)

typedef uint32_t WindowControlFlags;
enum{
  WindowControlFlag_Move       = (1 << 0),
  WindowControlFlag_Resize     = (1 << 1),
  WindowControlFlag_Min        = (1 << 2),
  WindowControlFlag_Max        = (1 << 3),
  WindowControlFlag_Close      = (1 << 4),
};

typedef struct Config{
  uint32_t serial;
  int32_t  dim[2];
  WindowFlags flags;
  uint32_t decoration_mode;
} Config;

typedef struct CSD_Frame{
  int32_t border[2][2]; // [0][]:x [1][]:y [][0]:min [][1]:max
  int32_t minbox[2];
} CSD_Frame;

typedef struct CSD_SubSurface{
  struct wl_surface    *wl_surface;
  struct wl_subsurface *wl_subsurface;
  struct wl_buffer     *wl_buffer;
  void                 *data;
  uint64_t              size;
  int32_t               dim[2];
  int32_t               p[2];
} CSD_SubSurface;

typedef struct GTK_Ctx{
  cairo_surface_t *shadow_blur;
} GTK_Ctx;

typedef struct GTK_Window{
  int32_t p[2];
  uint32_t button;
  int double_click_time_ms;
  
  CSD_SubSurface titlebar;
  CSD_SubSurface shadow;
  
  GtkWidget *window;
  GtkWidget *header;
  
  uint32_t hover_button_code;
  uint32_t active_button_code;
} GTK_Window;

typedef struct Ctx{
  /* "application variables" */
  int close_signal;
  
  /* globals: desktop settings */
  ColorScheme color_scheme;
  CursorTheme cursor_theme;
  
  /* globals: wayland */
  struct wl_display       *wl_display;
  struct wl_registry      *wl_registry;
  struct wl_compositor    *wl_compositor;
  struct wl_subcompositor *wl_subcompositor;
  struct wl_shm           *wl_shm;
  struct xdg_wm_base      *xdg_wm_base;
  struct zxdg_decoration_manager_v1 *zxdg_decoration_manager;
  
  struct wl_cursor_theme *wl_cursor_theme;
  struct wl_cursor       *wl_cursors[CursorShape_COUNT];
  
  /* globals: egl */
  EGLDisplay egl_display;
  EGLContext egl_context;
  
  /* globals: gtk */
  GTK_Ctx gtk_ctx;
  
  /* per-seat: wayland */
  struct wl_seat    *wl_seat;
  struct wl_pointer *wl_pointer;
  struct wl_surface *cursor_surface;
  
  struct wl_surface *hover_surface;
  
  CursorShape cursor_shape;
  
  /* per-window: wayland */
  struct wl_surface     *main_wl_surface;
  struct xdg_surface    *main_xdg_surface;
  struct xdg_toplevel   *main_xdg_toplevel;
  struct zxdg_toplevel_decoration_v1 *main_zxdg_toplevel_decoration;
  
  /* per-window: egl */
  struct wl_egl_window  *main_wl_egl_window;
  EGLSurface             main_egl_surface;
  
  /* per-window */
  WindowControlFlags control_flags;
  int32_t dim[2];
  int32_t mmbox[2][2]; // [0][]:x [1][]:y [][0]:min [][1]:max
  
  Config config;
  Config config_staged;
  uint32_t serial;
  
  int handled_first_size;
  CSD_Frame csd_frame;
  int32_t csd_dim[2];
  
  GTK_Window gtk_window;
} Ctx;

/* csd helpers */

static CSD_SubSurface csd_subsurface_new(void);
static void           csd_subsurface_buffer_clear(CSD_SubSurface *subsurface);
static void           csd_subsurface_buffer_alloc(CSD_SubSurface *subsurface, int32_t dim[2]);
static void           csd_subsurface_set_position(CSD_SubSurface *subsurface, int32_t x, int32_t y);
static void           csd_subsurface_commit(CSD_SubSurface *subsurface);

static WindowFlags    csd_window_flags_from_states_array(struct wl_array *states);

/* os */

static int os_resize_anonymous_file(int fd, off_t size);
static int os_create_anonymous_file(off_t size);

/* desktop settings */

static CursorTheme ds_get_cursor_theme(void);
static ColorScheme ds_get_color_scheme(void);

static CursorTheme ds__get_cursor_theme_from_env(void);

#if defined(HAS_DBUS)
#include <dbus/dbus.h>
static DBusMessage* ds__get_setting_sync(DBusConnection *const connection, const char *k, const char *v);
static int          ds__parse_type(DBusMessage *const reply, const int type, void *value);
#endif /* defined(HAS_DBUS) */



/* csd gtk implementation */

static void      csd_gtk_init(void);
static void      csd_gtk_window_init(void);
static CSD_Frame csd_gtk_calculate_frame(void);

static void      csd_gtk_update_and_render(void);
static void      csd_gtk_render(void);

/* cairo shadow rendering */

static int  cr_blur_surface(cairo_surface_t *surface, int margin);
static void cr_render_shadow(cairo_t *cr, cairo_surface_t *surface,
                             int x, int y, int width, int height,
                             int margin, int top_margin);

#endif /* WAYLAND_GTK_EGL_EXAMPLE_H */