#ifndef MEMBER_SYNC_H
#define MEMBER_SYNC_H

#ifdef __cplusplus
extern "C" {
#endif

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

struct UTUN_INSTANCE;

#define ETCP_RT_ID_MEMBER_SYNC 0x31
#define MS_MAX_BATCH 32
#define MS_MAX_LEVEL 5
#define MS_BUCKETS  32
#define MS_HASH_SIZE 32

/* Wire message types (etcp_router service 0x31) */
#define MS_MSG_HASHES  0x01
#define MS_MSG_REQUEST 0x02
#define MS_MSG_BATCH   0x03

/* === Initialization === */
int  member_sync_init(struct UTUN_INSTANCE* inst);
void member_sync_destroy(struct UTUN_INSTANCE* inst);

/* === CRUD (DB write + tree recompute) === */
int  member_sync_put(struct UTUN_INSTANCE* inst, const char* ch_id,
                     uint64_t member_id, const uint8_t* x25519,
                     const uint8_t* ed25519, const uint8_t* join_sig,
                     const uint8_t* addrs_data, int addr_count);
int  member_sync_del(struct UTUN_INSTANCE* inst, const char* ch_id, uint64_t member_id);
int  member_sync_count(struct UTUN_INSTANCE* inst, const char* ch_id);

/* === Online status (updates nodes.online + recomputes tree path) === */
void member_sync_set_online(struct UTUN_INSTANCE* inst, uint64_t node_id, int online);

/* === Protocol primitives === */
int  member_sync_get_level_hashes(struct UTUN_INSTANCE* inst,
                                  const char* ch_id, uint8_t level,
                                  uint64_t prefix, uint8_t prefix_bytes,
                                  uint32_t* bitmap, uint8_t hashes[MS_BUCKETS][MS_HASH_SIZE]);
int  member_sync_get_bucket_members(struct UTUN_INSTANCE* inst,
                                    const char* ch_id, uint8_t level,
                                    uint64_t prefix, uint8_t prefix_bytes,
                                    uint8_t* buf, size_t* len);

/* === Background consistency check === */
int  member_sync_bg_check(struct UTUN_INSTANCE* inst, const char* ch_id);

/* === Sync sessions === */
void member_sync_start(struct UTUN_INSTANCE* inst, uint64_t peer, const char* ch_id);
void member_sync_cancel_peer(struct UTUN_INSTANCE* inst, uint64_t peer);

/* === Test helper === */
const uint8_t* member_sync_get_hash(struct UTUN_INSTANCE* inst,
                                     const char* ch_id, uint8_t level, uint64_t prefix64);

#ifdef __cplusplus
}
#endif
#endif /* MEMBER_SYNC_H */