#include <EGL/egl.h>
#include <wayland-egl.h>
#include "xdg-shell-protocol.h"
#include "wlr-layer-shell-unstable-v1-protocol.h"

/// A normal window
#define OUTPUT_WINDOW 0
/// A desktop layer (wallpaper)
#define OUTPUT_LAYER 1

#define DEFAULT_WIDTH 400
#define DEFAULT_HEIGHT 400

struct surface {
    int width, height;

    /// Wating to be redrawn.
    bool dirty;

    struct wl_surface *wl_surface;
    struct xdg_surface *xdg_surface;
    struct xdg_toplevel *xdg_toplevel;
    struct wl_egl_window *egl_window;
    struct zwlr_layer_surface_v1 *zwlr_layer_surface_v1;
    struct wl_output *wl_output;

    EGLSurface egl_surface;
};

struct surface_list {
    struct surface data;
    struct surface_list *next;
};

struct client_state {
    int running;
    int output_type;
    /* Globals */
    struct wl_display *wl_display;
    struct wl_registry *wl_registry;
    struct wl_compositor *wl_compositor;
    struct xdg_wm_base *xdg_wm_base;
    struct zwlr_layer_shell_v1 *zwlr_layer_shell_v1;

    struct surface_list *surface_list;
    /// Next in queue to check if it wants to be rendered.
    struct surface_list *surface_list_next;

    EGLDisplay egl_display;
    EGLConfig egl_config;
    EGLContext egl_context;
};

#define EVENT_NONE 0
#define EVENT_DRAW 1

struct event {
    int type;
    union {
        /// EVENT_DRAW
        struct {
            int width, height;
            struct surface *surface;
        } draw;
    } data;
};

void wayland_init(struct client_state *state, int output_type);
void commit(struct client_state *state);
/// Provide pointer to be filled.
struct event wait_for_event(struct client_state *state);
void swap_buffers(struct client_state *state, struct surface *surface);