#pragma once

#include <SDL3/SDL.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>

#define WINDOW_WIDTH 1280
#define WINDOW_HEIGHT 720
#define DEFAULT_WINDOW_NAME "Dangerzone"
#define WINDOW_NAME_LENGTH 128
#define TARGET_FRAME 1.0 / 60.0
#define FONT_ROWS 7
#define FONT_COLS 5

typedef struct {
	char window_name[WINDOW_NAME_LENGTH];
	uint16_t width, height;
	SDL_Window *window;
	SDL_Renderer *renderer;
	SDL_Texture *texture;
} engine_sdl_state_t;

typedef struct {
	/**
	 * this function runs inside of the SDL_PollEvent loop
	 * useful for user input, quitting the program and so on
	 */
	void (*engine_poll_events)(void);
	/**
	 * meant as the "area" for manupulating the framebuffer;
	 * after this is executed, the contents of 
	 * game_state->framebuffer get drawn
	 */
	void (*engine_update_framebuffer)(void);
	engine_sdl_state_t *sdl_state;
} engine_internal_state_t;

typedef struct {
	uint32_t framebuffer[WINDOW_WIDTH * WINDOW_HEIGHT];
	SDL_Event event;
	bool is_running;
	uint16_t width, height;
} game_state_t;

extern engine_internal_state_t *internal_state;
extern game_state_t *game_state;

engine_sdl_state_t*
engine_sdl_init();

void 
engine_sdl_destroy(
	engine_sdl_state_t *state
);

bool
engine_init(
	void (*engine_poll_events)(void),
	void (*engine_update_framebuffer)(void)
);

void
engine_start();

void
engine_stop();

void 
put_pixel(
	unsigned int x, 
	unsigned int y, 
	uint32_t color
);

void
put_rect(
	uint32_t x, 
	uint32_t y, 
	uint32_t w, 
	uint32_t h,
	uint32_t color
);

void 
clear_framebuffer(
	uint32_t color
);

void
put_char(
	char c,
	uint32_t x, 
	uint32_t y,
	uint32_t size,
	uint32_t fg_color,
	uint32_t bg_color
);

void
put_string(
    const char *text,
    uint32_t x,
    uint32_t y,
    uint32_t size,
    uint32_t spacing,
    uint32_t line_spacing,
    uint32_t fg_color,
    uint32_t bg_color
);