#ifndef EVSE_LINK_FRAMING_H_
#define EVSE_LINK_FRAMING_H_

#include <stdint.h>
#include <stdbool.h>
#include "driver/uart.h"

// UART configuration
#define UART_PORT        UART_NUM_2
#define UART_BAUDRATE    115200
#define UART_RX_BUF_SIZE 256

// GPIO pin assignments for UART
#define TX_PIN           21  // GPIO21 -> RX on other board
#define RX_PIN           22  // GPIO22 -> TX on other board

// Frame delimiters
#define MAGIC_START           0x7E
#define MAGIC_END             0x7F

// Maximum payload (excluding sequence byte)
#define EVSE_LINK_MAX_PAYLOAD 254

// Callback type for when a full frame is received
typedef void (*evse_link_frame_cb_t)(uint8_t src, uint8_t dest,
                                     const uint8_t *payload, uint8_t len);

// Initialize framing module (mutex, UART driver, etc.)
void evse_link_framing_init(void);

// Send a framed payload to `dest` with length `len`
// Includes source address in the header
bool evse_link_framing_send(uint8_t dest, uint8_t src,
                            const uint8_t *payload, uint8_t len);

// Feed a received byte into the framing parser
void evse_link_framing_recv_byte(uint8_t byte);

// Register a callback for complete frames
void evse_link_framing_register_cb(evse_link_frame_cb_t cb);

#endif // EVSE_LINK_FRAMING_H_