#ifndef UI_H
#define UI_H

#include "SDL_events.h"
#include "aliases.h"
#include "window.h"
#include <stdbool.h>

#define MAX_UI_ELEMENTS 8192

#define BUTTON_WIDTH 100
#define BUTTON_HEIGHT 40

#define NODE_WIDTH 70
#define NODE_HEIGHT 20

#define DEFAULT_NOODLE_LENGTH 60

typedef enum ui_elem_type ui_elem_type;
typedef struct ui_elem ui_elem;
typedef struct ui_ctx ui_ctx;
typedef struct ui_elem_colours ui_elem_colours;
typedef enum noodle_action noodle_action;

enum ui_elem_type {
  UI_ELEM_NODE,
  UI_ELEM_NOODLE,
  UI_ELEM_BUTTON,

  COUNT_UI_ELEM,
};

struct ui_elem {
  u64 id;
  union {
    rect rec;
    line ln;
  };
  ui_elem_type type;
};

struct ui_elem_colours {
  colour fill;
  colour border;
};

enum noodle_action {
  NOODLE_ACTION_NONE,
  NOODLE_ACTION_DRAGGING,
  NOODLE_ACTION_RELEASED,
};

struct ui_ctx {
  u64 count;
  i64 hovered;
  i64 active;
  i32 mouse_x;
  i32 mouse_y;
  i32 rel_x;
  i32 rel_y;
  bool mouse_down;
  bool mouse_up;
  const window *wnd;
  ui_elem elements[MAX_UI_ELEMENTS];
};

void init_ui_ctx(ui_ctx *ctx);
void reset_ui_ctx(ui_ctx *ctx);
void handle_ui_events(const window *wnd, ui_ctx *ctx, const SDL_Event *event);
bool ui_button(const window *wnd, ui_ctx *ctx, rect rect,
               ui_elem_colours colours);
bool ui_node(const window *wnd, ui_ctx *ctx, rect rect,
             ui_elem_colours colours);
noodle_action ui_noodle(const window *wnd, ui_ctx *ctx, line ln,
                        ui_elem_colours colours, rect parent_node);

#endif // !UI_H