#pragma once

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

enum reg_id
{
	REG_ID_VER = 0x01, // fw version
	REG_ID_CFG = 0x02, // config
	REG_ID_INT = 0x03, // interrupt status
	REG_ID_KEY = 0x04, // key status
	REG_ID_BKL = 0x05, // backlight
	REG_ID_DEB = 0x06, // key debounce cfg (not implemented)
	REG_ID_FRQ = 0x07, // key poll freq cfg
	REG_ID_RST = 0x08, // trigger a reset
	REG_ID_FIF = 0x09, // key fifo
	REG_ID_BK2 = 0x0A, // backlight 2
	REG_ID_DIR = 0x0B, // gpio direction
	REG_ID_PUE = 0x0C, // gpio input pull enable
	REG_ID_PUD = 0x0D, // gpio input pull direction
	REG_ID_GIO = 0x0E, // gpio value
	REG_ID_GIC = 0x0F, // gpio interrupt config
	REG_ID_GIN = 0x10, // gpio interrupt status
	REG_ID_HLD = 0x11, // key hold time cfg (in 10ms units)
	REG_ID_ADR = 0x12, // i2c puppet address
	REG_ID_IND = 0x13, // interrupt pin assert duration
	REG_ID_CF2 = 0x14, // config 2
	REG_ID_TOX = 0x15, // touch delta x since last read, at most (-128 to 127)
	REG_ID_TOY = 0x16, // touch delta y since last read, at most (-128 to 127)

	REG_ID_LAST,
};

#define CFG_OVERFLOW_ON		(1 << 0) // Should new FIFO entries overwrite oldest ones if FIFO is full
#define CFG_OVERFLOW_INT	(1 << 1) // Should FIFO overflow generate an interrupt
#define CFG_CAPSLOCK_INT	(1 << 2) // Should toggling caps lock generate interrupts
#define CFG_NUMLOCK_INT		(1 << 3) // Should toggling num lock generate interrupts
#define CFG_KEY_INT			(1 << 4) // Should key events generate interrupts
#define CFG_PANIC_INT		(1 << 5) // Not implemented
#define CFG_REPORT_MODS		(1 << 6) // Should Alt, Sym and Shifts be reported as well
#define CFG_USE_MODS		(1 << 7) // Should Alt, Sym and Shifts modify the keys reported

#define CF2_TOUCH_INT		(1 << 0) // Should touch events generate interrupts
#define CF2_USB_KEYB_ON		(1 << 1) // Should key events be sent over USB HID
#define CF2_USB_MOUSE_ON	(1 << 2) // Should touch events be sent over USB HID
// TODO? CF2_STICKY_MODS // Pressing and releasing a mod affects next key pressed

#define INT_OVERFLOW		(1 << 0)
#define INT_CAPSLOCK		(1 << 1)
#define INT_NUMLOCK			(1 << 2)
#define INT_KEY				(1 << 3)
#define INT_PANIC			(1 << 4)
#define INT_GPIO			(1 << 5)
#define INT_TOUCH			(1 << 6)
// Future me: If we need more INT_*, add a INT2 and use (1 << 7) here as indicator that the info is in INT2

#define KEY_CAPSLOCK		(1 << 5) // Caps lock status
#define KEY_NUMLOCK			(1 << 6) // Num lock status
#define KEY_COUNT_MASK		0x1F

#define DIR_OUTPUT			0
#define DIR_INPUT			1

#define PUD_DOWN			0
#define PUD_UP				1

#define VER_VAL				((VERSION_MAJOR << 4) | (VERSION_MINOR << 0))

#define PACKET_WRITE_MASK	(1 << 7)

void reg_process_packet(uint8_t in_reg, uint8_t in_data, uint8_t *out_buffer, uint8_t *out_len);

uint8_t reg_get_value(enum reg_id reg);
void reg_set_value(enum reg_id reg, uint8_t value);

bool reg_is_bit_set(enum reg_id reg, uint8_t bit);
void reg_set_bit(enum reg_id reg, uint8_t bit);
void reg_clear_bit(enum reg_id reg, uint8_t bit);

void reg_init(void);