#pragma once

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

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    TRIKKE_TRANSPORT_COMPLETE = 0,
    TRIKKE_TRANSPORT_RETRY,
    TRIKKE_TRANSPORT_PENDING,
    TRIKKE_TRANSPORT_FATAL,
} trikke_transport_status_t;

typedef trikke_transport_status_t (*trikke_transport_begin_fn)(
    void *context,
    const uint8_t *packet,
    size_t packet_size);

typedef trikke_transport_status_t (*trikke_transport_poll_fn)(void *context);

typedef struct {
    void *context;
    trikke_transport_begin_fn begin;
    trikke_transport_poll_fn poll;
} trikke_transport_t;

typedef struct {
    bool pending;
} trikke_transport_sender_t;

void trikke_transport_sender_init(trikke_transport_sender_t *sender);

// Advances one bounded transport operation. The packet storage must remain valid
// and unchanged from the first PENDING result through COMPLETE. While pending,
// only poll is called: an ambiguous timeout can never duplicate a frame.
trikke_transport_status_t trikke_transport_sender_step(
    trikke_transport_sender_t *sender,
    const trikke_transport_t *transport,
    const uint8_t *packet,
    size_t packet_size);

#ifdef __cplusplus
}
#endif