/**
 * @file vga.h
 * @brief VGA
 * @details Responsible for VGA buffer control.
 */
#ifndef VGA_H
#define VGA_H

/**
 * @brief 
 */
#define VGA_GRID_COLS 80

/**
 * @brief 
 */
#define VGA_GRID_ROWS 25

/**
 * @brief 
 */
#define DEFAULT_ATTRIBUTES 0x0F00 

#include <stdint.h>
#include <stdarg.h>
#include "io.h"

/**
 * @brief Information on the VGA buffer
 */
extern volatile uint16_t* const vga_buffer;

/**
 * @brief 
 */
typedef struct vga_ctx_s {
    int cursor_col;         /**< @brief  */
    int cursor_row;         /**< @brief  */
    uint16_t attributes;    /**< @brief  */
} vga_ctx_t;

/**
 * @brief grid is top left origin. This is our cursor! Black background, White foreground
 */
extern uint16_t vga_attributes;

/**
 * @brief 
 */
extern char_writer_t* default_vga;

/**
 * @brief Clear the VGA buffer, context optional
 * @param ctx 
 */
void vga_clear_ctx(vga_ctx_t* ctx);

/**
 * @brief 
 */
void vga_clear();

/**
 * @brief Write character c to cursor. Implements IO generic ASCII output
 * @param ctx 
 * @param c 
 * @return int 
 */
int vga_out(void* ctx, char c);


#endif