// routing.h - Centralized routing module for utun
#ifndef ROUTING_H
#define ROUTING_H

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

// Forward declarations
struct ETCP_CONN;
struct UTUN_INSTANCE;
struct ll_entry;

/**
 * @brief Initialize routing module for instance (route table only)
 * @param instance UTUN instance
 * @return 0 on success, -1 on error
 */
int routing_create(struct UTUN_INSTANCE* instance);

/**
 * @brief Bind DATA handler via etcp_router (must be called after etcp_router_init)
 * @param instance UTUN instance
 * @return 0 on success, -1 on error
 */
int routing_bind(struct UTUN_INSTANCE* instance);

/**
 * @brief Destroy routing module for instance
 * @param instance UTUN instance
 */
void routing_destroy(struct UTUN_INSTANCE* instance);

/**
 * @brief Register ETCP connection with routing
 * Called from pn_init() to register connection's normalizer output queue
 * @param etcp ETCP connection
 */
void routing_add_conn(struct ETCP_CONN* etcp);

/**
 * @brief Unregister ETCP connection from routing
 * Called from pn_deinit() to unregister connection's normalizer output queue
 * @param etcp ETCP connection
 */
void routing_del_conn(struct ETCP_CONN* etcp);

/**
 * @brief Set TUN interface for routing
 * Called from utun_instance_init() after tun_init()
 * @param instance UTUN instance with configured tun
 */
void routing_set_tun(struct UTUN_INSTANCE* instance);

/**
 * @brief Route a single packet (exposed for NAT module interception)
 */
void route_pkt(struct UTUN_INSTANCE* instance, struct ll_entry* entry, uint64_t src_node_id);

#endif // ROUTING_H