#ifndef UART_CMD_H
#define UART_CMD_H

#include "cmd_handler.h"
#include "esp_err.h"
#include "pb.h"
#include "uart_messages.pb.h"

/** Decode framed UART body (protobuf UartMessage without the leading type byte). */
esp_err_t uart_cmd_decode(const uint8_t *data, size_t len, alox_UartMessage *out);

/** Set type + oneof tag on an outbound UartMessage. */
void uart_cmd_init_response(alox_UartMessage *msg, alox_MessageType type,
                            pb_size_t which_payload);

/** Encode and send; logs on failure when log_tag is non-NULL. */
esp_err_t uart_cmd_send(const alox_UartMessage *msg, const char *log_tag);

esp_err_t uart_cmd_register(alox_MessageType type, msg_callback_t cb);

/** Nanopb encode callback for a NUL-terminated C string. */
bool uart_cmd_encode_string(pb_ostream_t *stream, const pb_field_t *field,
                            void *const *arg);

typedef struct {
  const uint8_t *data;
  size_t len;
} uart_cmd_bytes_t;

/** Nanopb encode callback; arg is uart_cmd_bytes_t *. */
bool uart_cmd_encode_bytes(pb_ostream_t *stream, const pb_field_t *field,
                           void *const *arg);

#define UART_CMD_REQ(msg, tag, field)                                          \
  ((msg)->which_payload == (tag) ? &(msg)->payload.field : NULL)

#endif