#ifndef CLIENT_REGISTRY_H
#define CLIENT_REGISTRY_H

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

#define CLIENT_REGISTRY_MAX 16
#define CLIENT_MAC_LEN 6

typedef struct {
  uint32_t id;
  bool available;
  bool used;
  uint8_t mac[CLIENT_MAC_LEN];
  uint32_t last_ping;
  uint32_t last_success_ping;
  uint32_t version;
} client_info_t;

void client_registry_init(void);

/** Register or refresh a client; sets last_ping and last_success_ping to now. */
esp_err_t client_registry_upsert(const uint8_t mac[CLIENT_MAC_LEN], uint32_t id,
                                 uint32_t version, bool available, bool used,
                                 bool *out_is_new);

size_t client_registry_count(void);
const client_info_t *client_registry_at(size_t index);
const client_info_t *client_registry_find_by_mac(const uint8_t mac[CLIENT_MAC_LEN]);

#endif