// SPDX-License-Identifier: BSD-2-Clause
// Copyright (c) 2023 KBEmbedded

#ifndef __GBLINK_H__
#define __GBLINK_H__

#pragma once

#include <furi.h>
#include <furi_hal.h>
#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
	/* Flipper drives the clock line */
	/* Unsupported at this time */
	GBLINK_CLK_INT,
	/* Game Boy drives the clock line */
	GBLINK_CLK_EXT,
} gblink_clk_source;

/* Currently unused */
typedef enum {
	GBLINK_MODE_GBC,
	GBLINK_MODE_GBA,
} gblink_mode;

/* Should this just be a macro? */
/* This pretty much only applies to GBC, OG GB is 8192 Hz only */
/* This is only for TX */
typedef enum {
	GBLINK_SPD_8192HZ = 4096,
	GBLINK_SPD_16384HZ = 8192,
	GBLINK_SPD_262144HZ = 16384,
	GBLINK_SPD_524288HZ = 262144,
} gblink_speed;

struct gblink_pins {
        const GpioPin *serin;
        const GpioPin *serout;
        const GpioPin *clk;
        const GpioPin *sd;
};

typedef enum {
	PINOUT_ORIGINAL,
	PINOUT_MALVEKE_EXT1,
	PINOUT_COUNT,
} gblink_pinouts;

typedef enum {
	PIN_SERIN,
	PIN_SEROUT,
	PIN_CLK,
	PIN_SD,
	PIN_COUNT,
} gblink_bus_pins;

/*
 * NOTE:
 * This can be called at any time, it resets the current byte transfer information
 */
void gblink_clk_source_set(void *handle, gblink_clk_source clk_source);

void gblink_speed_set(void *handle, gblink_speed speed);

void gblink_timeout_set(void *handle, uint32_t us);

bool gblink_transfer(void *handle, uint8_t val);

/* Can only be run after alloc, before start */
int gblink_pin_set_default(void *handle, gblink_pinouts pinout);

int gblink_pin_set(void *handle, gblink_bus_pins pin, const GpioPin *gpio);

const GpioPin *gblink_pin_get(void *handle, gblink_bus_pins pin);

int gblink_callback_set(void *handle, void (*callback)(void* cb_context, uint8_t in), void *cb_context);

int gblink_mode_set(void *handle, gblink_mode mode);

/* 
 * This can be used for INT or EXT clock modes. After a call to
 * gblink_transfer this can be called at any time and will return only after
 * a full byte is transferred and it will return the byte that was last shifted
 * in from the link partner.
 */
uint8_t gblink_transfer_tx_wait_complete(void *handle);

void gblink_nobyte_set(void *handle, uint8_t val);

void gblink_int_enable(void *handle);

void gblink_int_disable(void *handle);

/* Sets up some defaults */
void *gblink_alloc(void);

void gblink_free(void *handle);

void gblink_start(void *handle);

void gblink_stop(void *handle);

// void gblink_blink_led_on_byte(handle, color?)
// get blink?

#ifdef __cplusplus
}
#endif

#endif // __GBLINK_H__