/**
 * @file config.h
 * @brief NVS Configuration Management
 */

#ifndef CONFIG_H
#define CONFIG_H

#include <esp_err.h>

/* WireGuard configuration structure */
typedef struct {
    char device_id[37];         /* UUID */
    char private_key[64];       /* WG private key hex */
    char preshared_key[64];     /* PSK hex */
    char internal_ip[18];       /* e.g. "10.172.21.2" */
    char server_pub[64];        /* Server WG public key hex */
    char endpoint[128];         /* e.g. "italy-twenty.gl.at.ply.gg:59750" */
    char dns[64];               /* DNS server */
    char allowed_ips[128];      /* e.g. "0.0.0.0/0" */
    char server_wg_ip[18];      /* e.g. "10.172.21.1" */
    char config_hash[64];       /* Last config hash */
} wg_config_t;

/* Device state */
typedef enum {
    STATE_BOOT,
    STATE_WIFI_INIT,
    STATE_WIFI_CONNECTED,
    STATE_PROVISIONING,
    STATE_PROVISIONED,
    STATE_TUNNEL_UP,
    STATE_TUNNEL_DOWN,
    STATE_HEARTBEAT,
    STATE_ERROR
} device_state_t;

/**
 * @brief Initialize configuration module
 */
esp_err_t config_init(void);

/**
 * @brief Save configuration to NVS
 */
esp_err_t config_save(const wg_config_t *config);

/**
 * @brief Load configuration from NVS
 */
esp_err_t config_load(wg_config_t *config);

/**
 * @brief Clear configuration from NVS
 */
esp_err_t config_clear(void);

/**
 * @brief Check if configuration is valid
 */
bool config_is_valid(const wg_config_t *config);

#endif /* CONFIG_H */