#ifndef CHAT_SYNC_H
#define CHAT_SYNC_H

#ifdef __cplusplus
extern "C" {
#endif

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

struct UTUN_INSTANCE;
struct UASYNC;

/* etcp service ID (direct P2P) */
#define ETCP_RT_ID_CHAT_SYNC    0x30
#define ETCP_RT_ID_MEMBER_SYNC  0x31

/* Message types */
#define CS_MSG_INIT_SYNC        0x01
#define CS_MSG_INIT_RESP        0x02
#define CS_MSG_SEND_DATA        0x03
#define CS_MSG_PUSH             0x04
#define CS_MSG_ACK_PUSH         0x05
#define CS_MSG_SYNC_DONE        0x06
#define CS_MSG_ERROR            0x07
#define CS_MSG_CHANNEL_INFO_REQ 0x09
#define CS_MSG_CHANNEL_INFO_RESP 0x0A
#define CS_MSG_CHANNEL_JOIN     0x0B
#define CS_MSG_WELCOME          0x0C
#define CS_MSG_PEER_UPSERT      0x0D
#define CS_MSG_PEER_REMOVE      0x0E

/* Protocol constants */
#define CS_SEND_DATA_MAX     32
#define CS_MAX_SPARSE        16
#define CS_PEER_TIMEOUT_MS   5000

/* Sync states per channel */
#define CS_SYNC_NONE         0
#define CS_SYNC_IN_PROGRESS  1
#define CS_SYNC_DONE         2

/* ── Public API ── */

int  chat_sync_init(struct UTUN_INSTANCE* inst,
                    void (*gui_result_cb)(void*, int, const uint8_t*, int));
void chat_sync_destroy(struct UTUN_INSTANCE* inst);

/* Прямое ETCP-подключение к узлу (pubkey+адреса из БД) */
void chat_sync_connect_node(struct UTUN_INSTANCE* inst, uint64_t node_id);

/* Подключиться к пиру по данным invite-ссылки (вызывается из GUI-потока) */
void chat_sync_connect_from_invite(uint64_t channel_id, uint64_t node_id,
                                   const uint8_t* pubkey_bin,
                                   const uint8_t* addrs_data, int addr_count);

#ifdef __cplusplus
}
#endif
#endif /* CHAT_SYNC_H */