#ifndef MGL_WINDOW_H
#define MGL_WINDOW_H

#include "../graphics/color.h"
#include "../system/vec.h"
#include "../system/clock.h"
#include "key.h"
#include <stdbool.h>

/* Vsync is automatically set for created windows, if supported by the system */

typedef struct mgl_event mgl_event;
/* x11 window handle. TODO: Add others when wayland, etc is added */
typedef unsigned long mgl_window_handle;

typedef struct mgl_window mgl_window;

typedef struct {
    mgl_vec2i position;
    mgl_vec2i size;
} mgl_view;

struct mgl_window {
    mgl_window_handle window;
    void *context;
    mgl_vec2i size;
    /* relative to the top left of the window. only updates when the cursor is inside the window */
    mgl_vec2i cursor_position;
    mgl_view view;
    bool open;
    bool focused;
    double frame_time_limit;
    mgl_clock frame_timer;
};

int mgl_window_create(mgl_window *self, const char *title, int width, int height);
/* if |parent_window| is 0 then the root window is used */
int mgl_window_create_with_params(mgl_window *self, const char *title, int width, int height, mgl_window_handle parent_window);
int mgl_window_init_from_existing_window(mgl_window *self, mgl_window_handle existing_window);
void mgl_window_deinit(mgl_window *self);

void mgl_window_clear(mgl_window *self, mgl_color color);
bool mgl_window_poll_event(mgl_window *self, mgl_event *event);
void mgl_window_display(mgl_window *self);

/*
    This should be called every frame to retain the view.
    Make sure to set the view back to the previous view after rendering items
    by saving the previous view with |mgl_window_get_view| and then call
    |mgl_window_set_view| with that saved view.
*/
void mgl_window_set_view(mgl_window *self, mgl_view *new_view);
void mgl_window_get_view(mgl_window *self, mgl_view *view);

bool mgl_window_is_open(const mgl_window *self);
bool mgl_window_has_focus(const mgl_window *self);
bool mgl_window_is_key_pressed(const mgl_window *self, mgl_key key);

void mgl_window_close(mgl_window *self);
void mgl_window_set_title(mgl_window *self, const char *title);
void mgl_window_set_cursor_visible(mgl_window *self, bool visible);
/* 0 = no fps limit */
void mgl_window_set_framerate_limit(mgl_window *self, int fps);

#endif /* MGL_WINDOW_H */