#ifndef HAZEL_VGA_H_
#define HAZEL_VGA_H_


#include <stdint.h>

/*
 * Location of the linear text buffer
 * Used to directly modify text on screen
 * 80 columns by 25 rows
 */
#define VGA_MEMORY_ADDR 0xb8000

#define VGA_MAX_COLS 80
#define VGA_MAX_ROWS 25

#define CRTC_ADDR_PORT 0x3d4
#define CRTC_DATA_PORT 0x3d5

#define CRTC_CURSOR_LO_REGISTER 0x0f
#define CRTC_CURSOR_HI_REGISTER 0x0e

enum VGA_COLOR {
    VGA_COLOR_BLACK = 0,
    VGA_COLOR_BLUE = 1,
    VGA_COLOR_GREEN = 2,
    VGA_COLOR_CYAN = 3,
    VGA_COLOR_RED = 4,
    VGA_COLOR_MAGENTA = 5,
    VGA_COLOR_BROWN = 6,
    VGA_COLOR_LIGHT_GREY = 7,
    VGA_COLOR_DARK_GREY = 8,
    VGA_COLOR_LIGHT_BLUE = 9,
    VGA_COLOR_LIGHT_GREEN = 10,
    VGA_COLOR_LIGHT_CYAN = 11,
    VGA_COLOR_LIGHT_RED = 12,
    VGA_COLOR_LIGHT_MAGENTA = 13,
    VGA_COLOR_LIGHT_BROWN = 14,
    VGA_COLOR_WHITE = 15
};

/**
 * @brief Gets the text-mode cursor's position.
 *
 * @return The position, not offset, of the cursor. Multiply this by two for the offset.
 */
uint16_t get_cursor_pos();


/**
 * @brief Sets the cursor's position in VGA text-mode.
 *
 * @param pos The position, not offset, of the cursor. Multiply by two for the offset.
 */
void set_cursor_pos(uint16_t pos);

/**
 * @brief Clears the screen in VGA text-mode by overwriting every character with a zero, then resets the cursor position.
 */
void clear_screen(void);

void vga_putc(char c);
void popchar();

void set_color(enum VGA_COLOR col);

#endif