#pragma once

#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>

#define VGA_WIDTH  80
#define VGA_HEIGHT 25
#define TERM_BUF   ((uint16_t *)0xB8000)
#define TERM_COUNT 10

#define KEYBOARD_PORT 0x60

#define KEY_A                    0x1E
#define KEY_B                    0x30
#define KEY_C                    0x2E
#define KEY_D                    0x20
#define KEY_E                    0x12
#define KEY_F                    0x21
#define KEY_G                    0x22
#define KEY_H                    0x23
#define KEY_I                    0x17
#define KEY_J                    0x24
#define KEY_K                    0x25
#define KEY_L                    0x26
#define KEY_M                    0x32
#define KEY_N                    0x31
#define KEY_O                    0x18
#define KEY_P                    0x19
#define KEY_Q                    0x10
#define KEY_R                    0x13
#define KEY_S                    0x1F
#define KEY_T                    0x14
#define KEY_U                    0x16
#define KEY_V                    0x2F
#define KEY_W                    0x11
#define KEY_X                    0x2D
#define KEY_Y                    0x15
#define KEY_Z                    0x2C
#define KEY_1                    0x02
#define KEY_2                    0x03
#define KEY_3                    0x04
#define KEY_4                    0x05
#define KEY_5                    0x06
#define KEY_6                    0x07
#define KEY_7                    0x08
#define KEY_8                    0x09
#define KEY_9                    0x0A
#define KEY_0                    0x0B
#define KEY_MINUS                0x0C
#define KEY_EQUAL                0x0D
#define KEY_SQUARE_OPEN_BRACKET  0x1A
#define KEY_SQUARE_CLOSE_BRACKET 0x1B
#define KEY_SEMICOLON            0x27
#define KEY_BACKSLASH            0x2B
#define KEY_COMMA                0x33
#define KEY_DOT                  0x34
#define KEY_FORESLHASH           0x35
#define KEY_F1                   0x3B
#define KEY_F2                   0x3C
#define KEY_F3                   0x3D
#define KEY_F4                   0x3E
#define KEY_F5                   0x3F
#define KEY_F6                   0x40
#define KEY_F7                   0x41
#define KEY_F8                   0x42
#define KEY_F9                   0x43
#define KEY_F10                  0x44
#define KEY_F11                  0x85
#define KEY_F12                  0x86
#define KEY_BACKSPACE            0x0E
#define KEY_DELETE               0x53
#define KEY_DOWN                 0x50
#define KEY_END                  0x4F
#define KEY_ENTER                0x1C
#define KEY_ESC                  0x01
#define KEY_HOME                 0x47
#define KEY_INSERT               0x52
#define KEY_KEYPAD_5             0x4C
#define KEY_KEYPAD_MUL           0x37
#define KEY_KEYPAD_Minus         0x4A
#define KEY_KEYPAD_PLUS          0x4E
#define KEY_KEYPAD_DIV           0x35
#define KEY_LEFT                 0x4B
#define KEY_PAGE_DOWN            0x51
#define KEY_PAGE_UP              0x49
#define KEY_PRINT_SCREEN         0x37
#define KEY_RIGHT                0x4D
#define KEY_SPACE                0x39
#define KEY_TAB                  0x0F
#define KEY_UP                   0x48

struct screen {
	size_t row;
	size_t column;
	uint8_t color;
	uint16_t buffer[VGA_WIDTH * VGA_HEIGHT];
};

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,
};

void terminal_initialize(void);
void terminal_setcolor(uint8_t color);
void terminal_putentryat(char c, uint8_t color, size_t x, size_t y);
int terminal_putchar(char c);
int terminal_write(const char *data, size_t size);
int terminal_writestring(const char *data);
int terminal_writelong(long number);
void terminal_set_screen(int pos);
uint8_t terminal_getkey(void);
void update_cursor(void);