#ifndef VGA_H
#define VGA_H

#include <stdbool.h>

#include "string.h"
#include <stddef.h>

#include "interrupts.h"
#include "port.h"

#include "video.h"

#define NOF_MODE_REGS 66

typedef struct {
	video_mode_t base;
	uint8_t regs[NOF_MODE_REGS];
	uint8_t *segment;
	size_t segment_size;
} vga_mode_t;

typedef struct {
	video_t base;
	port8_t misc_port;
	port8_t crtc_index_port;
	port8_t crtc_data_port;
	port8_t sequencer_index_port;
	port8_t sequencer_data_port;
	port8_t graphics_controller_index_port;
	port8_t graphics_controller_data_port;
	port8_t attribute_controller_index_port;
	port8_t attribute_controller_read_port;
	port8_t attribute_controller_write_port;
	port8_t attribute_controller_reset_port;
	bool use_z_buffer;
	uint8_t *zbuffer;
	// stores either the address to the beginning of the segment
	// (real mapped I/O memory or the beginning of the Z buffer
	uint8_t *base_addr;
} vga_t;

typedef struct {
	video_vtable_t base;
} vga_vtable_t;

void vga_init( vga_t *vga, interrupt_t *interrupt, void *context );
void vga_activate( void *obj );
void vga_deactivate( void *obj );
void vga_deinit( void *obj );
void vga_print_name( void *obj );
void vga_print_info( void *obj );

bool vga_switch_mode( void *obj, const video_mode_t *mode );

void vga_set_pixel( void *, const int x, const int y, const video_rgb_color_t color );
void vga_draw_rectangle( void *, const int x, const int y, const int w, const int h, const video_rgb_color_t color );
void vga_clear_screen( void *, const video_rgb_color_t color );
void vga_draw_char( void *, const unsigned char c, const int x, const int y, const video_rgb_color_t background, const video_rgb_color_t foreground );
void vga_wait_for_retrace( void * );
void vga_use_z_buffer( void *, bool use );
void vga_refresh( void * );

#endif // VGA_H